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TESTC400 Release 2021-09-10
Send your 1.b4 games to me, please. Thank you! /Marek
Marek Trokenheim's homepage
(c) Marek Trokenheim

1.b4 d5 2.Bb2 Qd6

(...)

3.a3 Na6 4.e3 c5 5.b5 (5.Nf3 cb4 6.Be5 Qe6+=) 5...Nc7= 6.Nf3 Qc6?? (better 6...f6=) 7.bc6+– 1–0. GuestKVNL – Jarif, freechess.org, 2017.

3.a3 b6 4.e3 Bb7 5.Nf3 h6 (5...a5 6.Be5 Qd7 7.b5+=) 6.Ne5 (better 6.Be5 Qd7 7.d4+–) 6...Qf6? (6...Nd7 7.d4+=) 7.c4 (better 7.Bb5!? c6 8.Nc6 Qb2 9.Nb8 Kd8 10.Nc3 Rb8 11.Ra2 Qa2 12.Na2+–) 7...e6 8.c5 bc5 9.Qa4 (9.bc5 A) 9...Bc5? 10.Qb3 Bb6 11.Bb5 Kf8 12.Nd7 Nd7 13.Bf6 (worse 13.Bd7 Qg5–/+) 13...Ngf6 14.0–0+–; B) 9...c6+–) 9...c6+= 10.b5 (10.bc5 Nd7 11.Qb4 Nc5 12.Nc6 d4 13.Bd4 Qh4 14.Bc5 Qb4 15.ab4 Bc6+–) 10...Bd6= 11.Qc2?? (better 11.f4 a6 12.bc6 Bc6 13.Qb3=) 11...Be5–+ 12.Be5 Qe5 13.Nc3 d4 (13...Nf6 14.Rb1 Qd6 15.Be2–+) 14.Qe4 (14.f4 Qc7 15.Ne4 Nd7 16.Nc5 Nc5 17.Qc5 de3 18.Qe3 Nf6–+) 14...Qe4 (better 14...Qd6 15.Na4–+) 15.Ne4 de3 (better 15...Kd7!?–+) 16.Nd6–/+ Kd7 (16...Ke7 17.Nb7 ed2 18.Kd2–+) 17.Nb7 ef2 18.Kf2 cb5 19.Nc5 (19.Bb5 Ke7–/+) 19...Ke7 (19...Kd6 20.Ne4 Ke5 21.Bb5 Ke4 22.Be2–/+) 20.Bb5 Nf6 21.Na6 (better 21.d4–/+) 21...Rd8?? (better 21...Na6 22.Ba6 Rhd8–+) 22.Nc7=+ Ne4 (better 22...a6!? 23.Na8 ab5=+) 23.Ke3+= Nd2?? (better 23...Nd6 24.Bd3 Nd7 25.Na8 Ra8+=) 24.Na8+– a6 25.Be2 Nc6 (25...f5 26.Rad1+–) 26.Nc7 (26.Rac1 Nd4 27.Rc7 Kf8 28.Kd2 Nb5 29.Ke3 Ra8+–) 26...a5 (26...Nd4 27.Kd2 Nb5 28.Ke1 Nc7+–) 27.Bd1 (better 27.Rad1 Nd4 28.Kd2 (28.Rd2?! Nf5 29.Kf2 Rd2+–) 28...Nb5 29.Kc2 Nc7 30.Rd8 Kd8 31.Rd1 Ke7 32.Bf3+–) 27...Nc4+– 28.Ke4 (28.Kf2 Rd2 29.Ke1 Rb2+–) 28...f5 (28...g5 29.g4+=) 29.Kf3 Rd3 (29...N6e5 30.Kg3 Rd3 31.Bf3+–) 30.Ke2 Rd2 31.Kf3 (better 31.Ke1!?+–) 31...N6e5 32.Kg3 g5 33.h4 f4 34.Kh2 gh4 (better 34...Ne3!? 35.Re1 Rg2 36.Kh1 Rg3–/+ (36...gh4?? 37.Re3 Rg5 38.Re4+–)) 35.Kh3+= Ne3 36.Bh5?? (better 36.Bf3+–) 36...Rg2–+ Threatening mate: Rg3 (worse 36...Ng2 37.Rhb1 Ne3 38.Rb7+=) 37.Rae1?? (better 37.Rhg1 Rg3 38.Rg3 hg3 39.Rb1–+) 37...Rg3 38.Kh2 h3 (38...N5g4 39.Bg4 Ng4) 39.Rhg1–/+ Rg2 (39...Rg5!? 40.Be2 f3 41.Rg5 hg5=+) 40.Rg2 (40.Kh3 Rg5 41.Rg5 hg5+=) 40...hg2= 41.Kg1 (41.Nb5 Kd7=) 41...Nd3 (41...Kd7 42.Nb5=) 42.Rb1= Kf6 (better 42...Kd6!? 43.Ne8 Kc5+=) 43.Rb6+– Kg5 (43...Ne5 44.Re6 Kf5 45.Re8+–) 44.Bf3 (44.Be2!? Ne1 45.Ne6 Kf5 46.Nd4 Ke4 47.Nb3+–) 44...e5 45.Ne6 (45.Bg2 Ng2 46.Kg2 e4+–) 45...Kh4+= 46.Bg2 Ne1 (better 46...Kg3!? 47.Ng7 Ng2 48.Rg6 Kf3 49.Rg2 e4+=) 47.Be4+– f3?? (better 47...Kg3 48.Nc5 Nf3 49.Bf3 Kf3 50.Rh6 Nc4+–) 48.Kf2 N3g2 (48...N1c2 49.Rc6 (worse 49.Kf3 Nc4 50.Rc6 Nd2 51.Ke2 Ne4 52.Rc2 Kg3+–) 49...Ng4 50.Kf3+–) 49.Bf3 (better 49.Ra6 Kh3 50.Ra5+–) 49...Kh3 (49...Nf3 50.Kf3 Ne1 51.Ke4+–) 50.Bg2 (better 50.Be4 Kg4+–) 50...Ng2 51.Ng7 (51.Rb5 e4+–) 51...Nf4 52.Rh6 Kg4 53.Ne6 Nd3 (53...Ne6 54.Re6 Kf5 55.Ra6+–) 54.Ke3 Nb2 55.Ke4 Nc4 56.Rg6 Kh5 (56...Kh4 57.a4 Kh5 58.Rg8+–) 57.Rg3 Kh4 58.Rg5 (58.Rc3 Nb2+–) 58...Kh3 59.a4 Nb2 (59...Nd2 60.Kd3 Nf3 61.Rf5+–) 60.Nc5 (better 60.Re5 Kg3 61.Ra5 Nc4 62.Rg5 Kf2+–) 60...Nc4 61.Nb7 Nb6 (61...Kh4 62.Rg8+–) 62.Re5 Na4 (62...Kg3 63.Ra5 Kg4 64.Nd6+–) 63.Ra5 Nc3 64.Kf5 (64.Ke3 Kg3 65.Nd6 Nd1 66.Ke2 Nf2 67.Nf5 Kg4 68.Kf2 Kg5 69.Ke3 Kg6 70.Kf4 Kf7 71.Ke5 Kg8 72.Kf6 Kh7 73.Ra7 Kg8 74.Kg6 Kf8 75.Ra8) 64...Ne2 65.Ra3 Kh4 66.Ra4 Kh5 (66...Kg3+–) 67.Nd6 Ng3 (67...Ng1 68.Kf6 Nf3 69.Nf5 Nd4 70.Nd4 Kg4 71.Ke5 Kh4 72.Kf4 Kh5 73.Ra6 Kh4 74.Rh6) 68.Ke5 (68.Kf6 Kh6 69.Nf5 Nf5 70.Kf5 Kg7 71.Ra7 Kf8 72.Ke6 Kg8 73.Kf6 Kh8 74.Kg6 Kg8 75.Ra8) 68...Kg5 69.Ne4 Kg4 70.Nd2 Kh5 (70...Kh3 71.Kf4 Kg2+–) 71.Nf3 Kh6 (71...Kg6 72.Rg4 Kf7 73.Ng5 Ke7 74.Rg3 Kd7 75.Rc3 Ke7 76.Rc7 Ke8 77.Kf6 Kd8 78.Ne6 Ke8 79.Re7) 72.Rh4 (72.Kf6 Nh5 73.Kf7 Ng3 74.Rf4 Nh5 75.Re4 Ng3 76.Rh4 Nh5 77.Rh2 Kh7 78.Rh5) 72...Nh5 73.Ng5 (73.Ke6 Kg7 74.Rh5 Kg6 75.Rg5 Kh7 76.Kf7 Kh6 77.Rg4 Kh5 78.Rh4) 73...Kg5+– 74.Rh5 (better 74.Rh1!?+–) 74…Kh5= ½–½. MARYMARY – knightTemplar, ChessWorld.net, 2011.

3.a3 g5?? 4.Bh8+– f6 (4...Nd7 5.e3+–) 5.e4 (5.e3 Nh6+–) 5...de4 (5...Bf5+–) 6.Qh5 (6...Kd8 7.Qf7+–) 1–0. Fritz 8 – NN, 2005.

3.a3 g6 4.e3 e5 5.c4 c6 (5...Bg7 6.Nc3 Nf6 7.Nf3+=) 6.Nf3 (6.cd5 Bg7 7.f4 Ne7+–) 6...Bg7+= 7.cd5 cd5 8.Be2 (8.Nc3 Nc6+=) 8...f5 (8...Nc6 9.b5 Nce7 10.Qb3+=) 9.0–0 (9.Nc3 a6+–) 9...Nd7 10.Nc3 Ngf6? (better 10...a6+–) 11.Nb5+– Qb8 (11...Qb6 12.Rc1 (worse 12.Ne5 0–0+–; 12.Be5?! Ne5 13.Ne5 Ne4+–) 12...0–0 13.Qb3+–) 12.Rc1 (12.Rc1 0–0 13.Nc7+–) 1–0. GuestYZYP – GuestSBFR, freechess.org, 2020.

3.a3 h6 4.Nf3 a6 (4...Nd7 5.Nc3=) 5.e3 Nf6 6.Be2 (6.c4 Bg4+=) 6...Bd7 (6...Nbd7!?=) 7.Be5+– Qc6 8.Nd4 Qb6 9.Nc3 e6 10.g4 (10.0–0!?+=) 10...Bd6= 11.Bd6 Qd6 12.b5 (12.f4 e5 13.fe5 Qe5=) 12...ab5 (12...e5 13.Nf5 Bf5 14.gf5–/+) 13.Ndb5 Bb5 14.Bb5 (14.Nb5!? Qe7 15.a4=+) 14...c6–/+ 15.Bd3 0–0 (15...Ra3 16.Ra3 Qa3 17.f4–/+) 16.Qc1 (16.h4!? d4 17.g5 dc3 18.gf6 cd2 19.Kd2= (worse 19.Qd2 Qe5 20.Ke2 Qf6–/+)) 16...Na6 (16...Ng4 17.Qb2–/+) 17.f3 Nc5 18.Be2 Nh7 (18...e5 19.g5 hg5 20.Rg1–/+) 19.Qb2 Rad8 (better 19...e5!?–/+) 20.d4= Nd7 21.Qb7 Rb8 (21...Ra8 22.Qb2=) 22.Qa6+= Ng5 (22...e5 23.Qd3+=) 23.Kd2 (23.Nb5 Qe7 24.Qc6 Rfc8+–) 23...Nf6 (23...e5 24.h4 ed4 25.hg5 dc3 26.Ke1 Qg3 27.Kd1 Qf2–/+) 24.Nb5?? (better 24.h4!? Ngh7 25.f4+–) 24...Qd7 (24...Nf3!? 25.Bf3 Rb5–/+) 25.Nc3= Ra8 (25...Qd6 26.h4 Ngh7 27.f4+–) 26.Qd3 Nh3 27.Nd1 Ng5 (better 27...Ra4!?+=) 28.h4+– Ngh7 29.f4 (29.Rg1 Ne8+–) 29...Qc7 (29...Ne4 30.Ke1=) 30.Nc3 (30.Nf2 Kh8+–) 30...Ne8 (30...c5 31.dc5 Qa5 32.Bf3+=) 31.a4 (31.g5 Nd6 32.gh6 Nc4 33.Ke1 gh6+=) 31...Nd6+= 32.g5 Nf5 (better 32...c5 33.Ke1 cd4 34.ed4 Nf5+=) 33.e4?? (better 33.Bg4 Nd6 34.gh6 gh6 35.Ke1+–) 33...de4 34.Ne4 Rfd8 35.c3 c5 (better 35...Qf4!? 36.Ke1 hg5 37.hg5 Ng5 38.Ng5 Qg5=+) 36.Nc5+– h5? (36...Qf4 37.Ke1 Nh4 38.Qh3 Ng5 39.Qh4+=) 37.Raf1 (37.Bh5 Ra5 38.Nb3 Qf4 39.Kd1 Re5+–) 37...g6 (37...Ra5 38.Nb3 Ra4 39.Bh5+=) 38.Rh3 (38.Ke1 Ra5 39.Qf3 Rd4 40.Ne6 fe6 41.cd4 Ra4+–) 38...Nf8 (38...Ra5 39.Na6 Qa7 40.Ke1 Ra4 41.Qb5=) 39.Kc2 (better 39.Ke1!?+–) 39...Nd7 (39...Ra5 40.Qc4 Nd6 41.Qb4+=) 40.Nd7+= Rd7 41.Qc4 Qc4 (41...Qd8!? 42.Kd3 Rb8=) 42.Bc4+– Rc7 (42...Ra4 43.Bd3+–) 43.Kb3+– Nd6 44.Bd3 Nf5? (better 44...Rb7 45.Ka3 Rba7+–) 45.Bf5 ef5 (45...Rb7 46.Kc2 gf5 47.Ra1+–) 46.Re3 (better 46.Ra1!? Rb7 47.Kc4 Rba7+–) 46...Rb7 47.Kc2 (47.Ka3 Rba7+–) 47...Ra4 48.Kd3 Ra8 (48...Rb2 49.Re8 Kg7 50.d5+–) 49.Rfe1 Kf8 50.d5 Rd7 (50...Rc8 51.Rc1+–) 51.c4 Ra3 (51...Ra2 52.Re8 Kg7 53.Rb8+–) 52.Kd4 Re3 (52...Ra2 53.R1e2 Ra1 54.Re8 Kg7+–) 53.Re3 (53.Ke3?! Re7 54.Kd2 Rd7+–) 53...Kg7 (53...Rd6 54.c5 Rd8 55.c6+–) 54.c5 Ra7 55.Rc3 Ra4 56.Rc4 Ra1 (56...Ra8 57.c6 Kf8 58.d6+–) 57.c6 Rd1 (57...Ra8 58.c7 Kf8+–) 58.Kc5 Kf8 59.c7 (59.c7 Kg7 60.c8Q+–) 1–0. Delboy Smith (1780) – Tony _ R, ChessWorld.net, 2009.

3.Ba3 Nf6 4.b5 Qb6 5.e3 a6 6.ba6 Na6 7.Be2 Nc5 8.c3 (8.Nf3 Bg4=+) 8...e5 9.Qc1 (9.d4 ed4 10.cd4 Nce4 11.Bf8 Rf8–/+) 9...Bd6 (9...e4!?–/+) 10.d4=+ ed4 11.cd4 Qa5 12.Kf1 Nce4 13.Bd6 Nd6 14.Nd2 0–0 15.Nb3 Qb6 16.Bd3 Bf5 17.Bf5 Nf5 18.Ne2 Rfe8 (18...Ne4 19.Kg1=+) 19.Nc5 (19.Qc5 Re6 20.Qb6 Rb6=+ (worse 20...cb6 21.Nbc1=)) 19...Ng4 20.Nd7? (better 20.Kg1=+) 20...Qd6–+ 21.Nc5? (better 21.Ne5 Ne5 22.de5 Re5 23.Rb1–+) 21...Qf6 (21...Nh2?! 22.Kg1 Ng4 23.Qc2=) 22.Nd3 Nfe3 23.Ke1 (23.Kg1 Ng2! 24.Nef4 Nf4 25.Qf4–+) 23...Ng2 24.Kd2 Nf2 25.Ne5 (25.Nf2 Qf2 26.Qf1 Qe3 27.Kc2 Qe4 28.Kb2 Ne3–+) 25...Nh1 26.Qh1 Qh6 27.Kc2 Ne3 28.Kd3 (28.Kd2 f6 29.Qf3 Ra3–+) 28...f6 29.Ng4 (29.Nc3 fe5 30.Nb5–+) 29...Ra3 30.Kd2 (30.Nc3 Qg6 31.Qe4 Qe4 32.Ke2 Qc2 33.Ke1 Ng4 34.Ne4 Re4 35.Kf1 Qf2) 30…Ng4 (30...Ng4 31.Ke1 Re2 32.Ke2 Qe3 33.Kd1 Qd4 34.Ke2 Qb2 35.Ke1 Re3 36.Kd1 Nf2) 0–1. petrobbo (2060) – Coroticus (2380), ChessWorld.net, 2010.

3.Ba3 g6 4.b5 Qb6 5.Bb2 Nf6 6.e3 Bg7 7.Nc3 0–0 8.Na4 Qa5 9.Nc5 Nbd7 10.Bc3 Qa3 11.Nd3 c5 12.Ne5?? (12.bc6 bc6 13.Bb4 Qa4=) 12...b6?? (better is 12...Ne4 13.Nc4 dc4 14.Bg7 Kg7 15.Bc4 Nd6–+) 13.Ne2 Ne4 14.Nd7 Bc3 15.Nf8?? (better is 15.dc3 Bd7 16.Qd5=+) 15...Bd2–+ 16.Qd2 Nd2 17.Kd2 Qb2 18.Rd1 Bf5 19.Rc1 d4 (19...Rf8 20.Ng3 Bd7 21.Be2–+) 20.ed4 Rd8 21.Nf4 (21.Nh7 Kh7 22.a3–+) 21...Qd4 22.Nd3 Qf2 23.Kc3 (23.Be2 Kf8 24.Rcf1 Qg2 25.Rhg1 Qh2 26.Rh1–+) 23...Qd4 24.Kd2 c4 25.c3 (25.Be2–+) 25...Qf2 26.Be2 Rd3 27.Kc2 Qe2 28.Kb1 Rd2 29.Rc2 Rd1 30.Rd1 (30.Kb2 Qc2 31.Ka3 Qc3 32.Ka4 Bc2) 30...Qc2 31.Ka1 Qc3# 0–1. cagey – AsylumAndTerror2, Live Game Caissa's Web, 2004.

3.b5 a5 4.a4 c5 (4...Nd7 5.e3=) 5.e3 Nf6 6.Nf3 Bg4 7.h3 Bf3 8.Qf3 e6 (8...Nbd7!?=) 9.Bf6+= gf6 10.Qf6 (10.c4 Nd7+=) 10...Rg8 11.Nc3 Bg7 12.Qh4 Nd7 Black prepares the advance d4 (12...h6!?+=) 13.Qh7+– 0–0–0 14.Qh5 d4 (14...f5 15.Qe2+–) 15.Ne4 Qd5 16.Qd5 ed5 17.Nd6 Kc7 18.Nf5 Bf6? (18...de3 19.Ng7 ef2 20.Kf2 Rg7 21.Be2+–) 19.0–0–0 (19.ed4 Rde8 20.Kd1 Bd4 21.Nd4 cd4+–) 19...Nb6 (19...de3 20.fe3 Nb6 21.d4+–) 20.ed4+– cd4 21.g4 Na4 22.Bg2 (22.f4!?+–) 22...Kb6+– 23.f4 d3 24.c3 Kb5 25.g5 Bh8 26.Ne7 (26.Rde1!?+–) 26...Rge8+= 27.Nd5 (27.Rde1!?+=) 27...Re2= 28.Bf3 Rf2 29.Be4?? (better 29.Rdf1 Rf3 30.Nc7 Kc6 31.Rf3=) 29...Rd5?? (better 29...Nc5 30.Rhe1 Nb3 (30...Ne4?! 31.Re4 Rh2 32.Ne3+=) 31.Kb2 Nd2 32.Bd3 Nc4 33.Kc1 Rd5–+) 30.Bd5+– Bc3 31.dc3 (better 31.Bf7 Bd4 32.Be8 Kb4 33.Ba4 Ka4 34.Rdf1+–) 31...Nc3?? (better 31...Rc2 32.Kb1 Nc3 33.Ka1 Nd5 34.Rd3 Nc3 35.Rc3 Rc3+–) 32.Rd3+– Ne2 33.Kb1 Nf4 34.Rb3 Kc5 35.Bf7 b5 36.g6 Rg2 37.h4 (37.Rc1 Kd6 38.Rb5 Kd7+–) 37...a4 (37...Ng6 38.Rc1 Kd6 39.Rd3 Ke5 40.Rd5 Kf4 41.Rb5+–) 38.Rc1 (38.Rb2 Rb2 39.Kb2 Nh5+–) 38...Kb6 39.Rf3 (39.Rb2 Rb2 40.Kb2 Nh5+–) 39...Ne2 (39...Nh5 40.Rc8 Rh2 41.Rb8 Ka6 42.Rh8 Rh4 43.Rf5 Rh1 44.Kb2 Rh2 45.Ka3+–) 40.Rf6 Ka5 41.Rc2 a3 (41...Rg1 42.Kb2 Nd4+–) 42.Re2! Re2 43.g7 a2 44.Ba2 (44.Ba2 Re8 45.h5 Re1 46.Kb2 Re2 47.Ka1+–) 1–0. Abdullaevich (1830) – alexeidv (1825), lichess.org, 2019.

3.b5 Qc5 4.e3= a6 (4...Bf5 5.Bc3=) 5.ba6 (5.Bd4 Qd6=) 5...ba6 (5...Na6 6.Nf3=) 6.d4 (6.Nf3 Nc6=) 6...Qd6 (6...Qb6 7.Ba3=) 7.Nf3 (7.c4 Nf6+=) 7...Bg4 (7...Nd7 8.Ba3 Qb6 9.c4+=) 8.Be2 (8.c4 Qb6 9.Bc3 Nf6+=) 8...Bf3 (8...Nd7 9.Ba3 Qc6 10.0–0=) 9.Bf3+= c5? (better is 9...Nf6+=) 10.dc5+– Qd7 (better is 10...Qc5 11.Qd5 Qd5 12.Bd5 Ra7+–) 11.c4 Nc6 (11...e6 12.cd5 ed5 13.Qd5 Qd5 14.Bd5+–) 12.cd5 Nb4 (12...Rb8 13.Bc3 Na7+–) 13.a3 (13.a3 Nd5 14.Qd5 Qd5 15.Bd5+–) 1–0. Wall,Bill – JustinP, chess.com, 2008.

3.b5 d4 4.Nf3 e5 5.e4 (5.e3 Nf6 6.ed4 ed4 7.Nd4 Be7+–) 5...Bg4 6.h3 Bd7 (6...Be6!? 7.c3 dc3 8.Nc3 Nf6+–) 7.a4 Qg6 8.Qe2 (8.Ne5 Qe4 9.Qe2 Nf6 10.Qe4 Ne4 11.Bd4 Be6+–) 8...Nf6 (8...Bd6 9.c3 d3 10.Qd3+=) 9.Ne5+– Qg5? (9...Qe4 10.Qe4 Ne4 11.Be2+–) 10.Nd7?? (better 10.Bd4 c5 11.Nf3+–) 10...Nbd7+– 11.Bd4 Qg6 (11...Bc5 12.Bb2 0–0 13.h4+–) 12.c4 (12.Nc3 0–0–0 13.f3 Nh5+–) 12...Bb4 (12...Bc5 13.Bc5 Nc5 14.d3+=) 13.Bc3 (13.e5 0–0–0 14.Qe3 Rhe8+=) 13...Bc5 14.d4 Be7? (14...0–0–0 15.Qf3 Rhe8+–) 15.Nd2 0–0 16.Qe3 (16.Qf3 a5 17.e5 Rfe8+–) 16...Rfe8 (16...a5+–) 17.g3 (17.e5 Rad8+–) 17...Nb6?? (17...Ne4 18.Ne4 Bg5=+) 18.Bg2 (18.e5 Nbd5 19.cd5 Nd5+–) 18...Rad8 (18...Ne4 19.Ne4 f5+–) 19.0–0 Bf8 (19...a5 20.ba6! ba6 21.Rfb1+–) 20.Qd3 White plans d5 (better 20.e5!? Rb8+–) 20...c5 21.d5 Nbd7 (21...h5 22.f4 h4 23.g4+–) 22.f4 Re7 (22...Bd6 23.Rf3+–) 23.Rae1 White intends e5 (better 23.Qf3 Nb6+–) 23...Qh5 (23...Ne8 24.Rf3 Nd6 25.f5+–) 24.Qf3 (better 24.e5!? Ne8+–) 24...Qf3 25.Bf3 (25.Nf3?! Ne4 26.Re3 Ng3 27.Re7 Be7+=) 25...b6 (25...g6 26.e5 Nh5 27.Kg2+–) 26.e5 Ne8 27.d6 (27.Ne4 Nb8+–) 27...Re6 (27...Nd6 28.ed6 Re1 29.Re1+–) 28.Bd5 Rg6 (28...Rh6 29.Ne4 Ndf6 30.ef6 Rh3 31.Kg2+–) 29.Ne4 Kh8 (29...Ndf6 30.ef6 Nd6 31.f5+–) 30.f5 Rh6 (30...Rd6 31.ed6 f6 32.Be6+–) 31.Kg2 (31.Ng5 Ne5 32.Be5 Rd7 33.Nf7 Rf7 34.Bf7 Nd6 35.Bd6 Rf6 36.Bf8 Rf7 37.Bc5 h5 38.Re8 Kh7+–) 31...Rh5 (31...Ne5 32.Be5 Kg8 33.f6 Nf6 34.Bf6 gf6 35.Nf6 Kg7 36.Ng4+–) 32.g4 Rh4 (32...Ne5 33.Be5 f6 34.Bg3+–) 33.Bf7 (better 33.Ng5 Ne5 34.Be5+–) 33...g5 (33...Nb8 34.Be6 Nd7+–) 34.e6 Bg7 35.ed7 Nd6 36.Bg7 Kg7 37.Nd6 Rd7 (37...Rg4 38.hg4 h6 39.f6 Kh7 40.Be6 Rg8 41.Bg8 Kg6 42.d8Q h5 43.Qd7 hg4 44.Qh7) 38.f6 Kh6 (38...Kf8 39.Re8) 39.Nf5 1–0. Darkseid (1740) – Trexthegame, ChessWorld.net, 2006.

3.b5 f6 4.a4 (4.e3 Bf5=) 4...Qb4 (4...Nh6 5.Ba3 Qd8 6.e3=) 5.Bc3 (5.Ba3 Qa5=) 5...Qd6 6.e3 e5 7.Bb2 Bf5 (7...Ne7 8.Ba3 Qe6 9.Nc3=) 8.c4 (8.Ba3 Qe6=) 8...dc4 (8...Ne7 9.d4=) 9.Bc4 (9.Qf3 Bc8=) 9...c6 (9...Qb4 10.Qb3 Qb3 11.Bb3=) 10.Nf3 cb5 (10...Qb4 11.Qc1=) 11.ab5 (11.Bb5 Nc6+=) 11...Nd7 (11...Bd3 12.Qb3 Bc4 13.Qc4+=) 12.0–0 (12.Ba3 Qb6+=) 12...Nh6 (12...Qb4 13.Qb3 Qb3 14.Bb3=+) 13.Qb3 (13.Ba3 Qc7 14.Bf8 Rf8+=) 13...Nc5= 14.Qd1 Bg4 (14...Nd3 15.Ba3 Qd7 16.Bf8 Rf8 17.Qb3=) 15.h3 (15.d4 Nd7 16.Nbd2 Qb6+–) 15...Bh5 (15...Be6 16.Be6 Ne6 17.Qc2+=) 16.g4 (16.d4 Nd7 17.Nbd2 Nb6 18.de5 Bf3 19.ed6 Bd1 20.Rfd1 Bd6+–) 16...Bg6 (16...Bf7 17.Bf7 Nf7 18.d4=) 17.Nc3 (17.d4 ed4 18.ed4+=) 17...0–0–0?? (better 17...Bd3 18.Bd3 Nd3=+) 18.Ra7 Kb8? (better 18...Bd3 19.Bd3 Qd3+–) 19.Qa1 e4 (19...Kc8 20.d4 ed4 21.ed4+–) 20.Nd4 (better 20.Qa5 Na6 21.ba6+–) 20...f5 (20...Re8+–) 21.Ra8 (better 21.Nc6! Kc8 22.Ra8 Kc7 23.Qa5 b6 24.Ra7 Kc8 25.Na4 Qc7 26.Rc7 Kc7 27.Qb6 Kd6 28.Qd8 Nd7 29.Be5) 21...Kc7 22.b6! Kd7 (22...Kb6 23.Qa5 Mate attack; 22...Qb6 23.Nd5 Double attack (23.Nd5 Decoy)) 23.Bb5 Ke7 24.Rd8 Qd8 (24...Kd8 25.Qa8 Ke7+–) 25.Ba3 Kf6 (25...Qc8 26.Na4 Kf7 27.Nc5 Bc5+–) 26.Bc4 (26.Ne4 Ne4 27.Nf5 Ke6 28.Qa2 Qd5 29.Nd4 Kf6 30.Qd5 Bf7 31.Qe4 Bd6 32.g5 Kg5 33.Nf3 Kf6 34.Bb2 Be5 35.Qe5 Kg6 36.Nh4) 26...fg4 27.Nd5 (better 27.Ne4 Be4 28.Ne6 Kg6 29.Nd8 Be7+–) 27...Kg5 28.Bc5 Bc5 (28...Bf7 29.Nf4 Bc4 30.Nde6 Be6 31.Ne6 Kf5 32.Nd8 Bc5 33.Qg7 Rd8 34.Qh6 gh3 35.Qh7 Ke6 36.Qh3 Kd5 37.Qf5 Kd6 38.Qf4 Ke6 39.Qe4 Kd6 40.Qg6 Ke7 41.Qg5 Kd7 42.Qc5 Rg8 43.Kh2 Rh8 44.Kg3 Rg8 45.Kf4 Ke8 46.Qh5 Kd7 47.Rc1 Rf8 48.Ke4 Re8 49.Kd5 Rf8 50.Rc7 Kd8 51.Qg5 Rf6 52.Qf6 Ke8 53.Qe7) 29.Ne6 Kh4 30.Nd8 Rd8 31.hg4 (31.Qg7 Rd5 32.Bd5 Nf5 33.Qf6 Kh5 34.hg4 Kh6 35.Kg2 Nh4 36.Kg3 Nf5 37.gf5 Bd6 38.Kg4 Be5 39.Rh1 Bh2 40.Rh2) 31...Ng4 (31...Rd7 32.Nf4 Bb6 33.Qe5+–) 32.Qg7 Kh3 (32...Bd6 33.Qb7 Nh2 34.Qg7+–) 33.Nf4 (33.Qc7 Rd6 34.Nf4 Kh4 35.Qc5 Ne3 36.de3 Rf6 37.Qe7 h5 38.Qf6 Kg4 39.Be2) 33...Kh4 34.Ng6 (34.Kg2 Ne3 35.de3 Rd6 36.Qh6 Kg4 37.Ne6 Re6 38.Qf4 Kh5 39.Rh1) 34...hg6 35.Qg6 Rh8 36.Kg2 (36.Be2 Rg8 37.Qg8 Kh5 38.Kg2 Be7 39.Qg4 Kh6 40.Rh1 Bh4 41.Rh4) 36...Bb6 (36...Ne3 37.fe3 Bd6 38.Qf6 Kg4 39.Be2) 37.Rh1 (37.Rh1 Nh2 38.Rh2) 1–0. KLINGON09 (1775) – Sykorsky (1785), lichess.org, 2020.

3.c3 Qb4?? 4.cb4+– Nc6 5.a3 Nb4 6.ab4 e6 7.e3 Bb4 8.Nf3 Ba3 9.Na3 Nf6 10.Bf6 gf6 11.Be2 Rg8 12.0–0 Rg4 13.d4 Rd4 14.Nd4 e5 15.Nf3 f5 16.Rb1 e4 17.Nd4 b6 18.Qb3 Kd8 19.Ndb5 Bd7 20.Rfc1 Bb5 21.Nb5 c6 22.Nc3 d4 23.ed4 Ke8 24.d5 cd5 25.Nd5 Rd8 26.Ne3 Rd4 27.Bc4 Rc4 28.Nc4 b5 29.Qb5 (29.Qb5 Ke7 30.Qe5 Kd7 31.Qd6 Ke8 32.Rb8; 29.Nd6 Ke7 30.Qf7 Kd6 31.Rb5 e3 32.Rd5) 1–0. Fournier,Frederic (2020) – brayant1 (1640), (60+5) Owl21.com, 2009.

3.c3 c6 4.Nf3 Nf6 5.d4 Bg4 6.Nbd2 Nbd7 7.h3 Bf3 8.Nf3 e6 (8...e5 9.de5 Ne5 10.e3+=) 9.e3= Be7 10.Bd3 a6 11.a3 =. Wochnik – Sonara Valdes, corr 3GMM–48, 1995.

3.c3 Bf5 4.Qa4 c6 5.d3 e5 6.b5 Nf6 7.b6 (7.Nf3 cb5 8.Qb5 Nbd7=+) 7...Qc5 8.d4 (better is 8.ba7 Ra7 9.Qb3–/+) 8...Qc4?? (better is 8...Qb6!? 9.Qb3 ed4 10.cd4 Bb1 11.Rb1 Ne4 12.Qb6 ab6–+) 9.Qa5 (9.Qa7 Qa6 10.Qa6 Ra6 11.de5=+) 9...Bb4?? (better is 9...Bb1 10.Rb1 ed4–/+) 10.cb4?? (10.Qb4 Qb4 11.cb4 e4+–) 10...Qc2? (10...Bb1 11.Qc5 Qc5 12.dc5 Be4 13.Be5 ab6 14.cb6 Nbd7=) 11.Qa3 (11.Ba3!? Nbd7 12.b5 ed4 13.bc6 bc6+–) 11...ab6 12.Qa8 Ke7?? (12...Qb2 13.Qb8 Kd7 14.Qb7 Kd6+–) 13.Qb7 (better is 13.Qa3 e4+–) 13...Nfd7 14.Nf3 (better is 14.Ba3 Qa4 15.b5 Ke6 16.Nf3 Bb1 17.Rb1 Qa3 18.Nd2+–) 14...Qb2–+ 15.Ne5?? (15.e4 Qa1 16.Bd3 de4 17.Nh4 ed3 18.Nf5 Kf6 19.0–0 Kf5 20.d5–+) 15...Bb1 (15...Qc1) 16.Nd7?? (better is 16.Rb1!? Qb1 17.Kd2 Qb4 18.Kd3–/+) 16...Nd7 (16...Qc1) 17.Qc6?? (17.Rb1 Qb1 18.Kd2 Qb4 19.Kc1 Qa3 20.Kd1 Qa4 21.Kc1–+) 17...Qa1 (better is 17...Qb4 18.Kd1 Qd4 19.Ke1 Qa1–+) 18.Qd5 (18.f3–+) 18...Qa2 (18...Qc3 19.Kd1 Qc2 20.Ke1 Qc1) 19.e4? (better is 19.Qg5 Nf6 20.Qe5 Qe6 21.Qc7 Nd7 22.e3–+) 19...Ra8?? (better is 19...Qd5 20.ed5 Ra8–+) 20.Bc4+/– Qa1 (better is 20...Qb2 21.0–0 Rf8 22.Qg5 Ke8+–) 21.0–0+– Nf6 (21...Kd8 22.Qg5 f6 23.Qg7 Be4 24.Qg8 Kc7 25.Ra1 Ra1 26.Bf1 Rb1+–) 22.Qf7 Kd8 23.Qg7 (23.Qf8 Kc7 24.Qg7 Nd7+–) 23...Ne8 (23...Qd4 24.Qf8 Ne8+–) 24.Bb5 (24.Qg5 Kd7 25.Qd5 Kc8 26.Qe6 Kd8 27.Bb5+–) 24...Ng7–+ 25.Rc1 Ra2 (25...Bd3! 26.h4 Qc1 27.Kh2 Qf4 28.g3 Qf2 29.Kh3 Nh5 30.Kg4 Be4 31.Kh5 Qf5 32.Kh6 Qg6#) 26.g3 Be4 (26...Qd4 27.Rf1 Be4 28.Be2 Bd5 29.h3 Qe4 30.f3 Qe2 31.Rf2 Qf2 32.Kh1 Bf3#) 27.Ra1 Ra1 28.Bf1 Nf5 (better is 28...Bf3!? 29.h3–+) 29.g4 Nd4 30.h3 Nf3 (30...Ne2! 31.Kh2 Rf1 32.f3 Rf2 33.Kh1 Bf3#) 31.Kg2–+ b5! 32.Bb5 Rg1# 0–1. Toddo – Buchwald 01, ChessWorld.net, 2003.

3.Bc3 Nc6 (better 3...d4!? 4.Bb2 Qb4–/+) 4.b5= Ne5 5.e3 Nf6 6.d4 (6.f4 Nc4=) 6...Ng6 (6...Neg4 7.Bd3 Nh2 8.a3=+) 7.Nf3 Bg4 8.Be2 Ne4 9.Bb2?? (better 9.Nfd2 Nc3 10.Nc3=) 9...Qb4–+ 10.Bc3 Nc3 11.Nc3? (better 11.Qd2 Bf3 12.Bf3 Na2 13.c3 Qb5 14.Qa2–+) 11...Qc3 12.Nd2 Be2 13.Ke2 e6 14.Rb1 Bb4 (14...Bd6 15.h4–+) 15.Nb3 (15.Rb3 Qd2 16.Qd2 Bd2 17.Kd2 Kd7–+) 15...Qc4 (15...a6!? 16.ba6 Ra6 17.Nc1–+) 16.Qd3 Qd3 17.Kd3 Bd6 18.a4 0–0 19.Ke2 (19.Na5 b6 20.Nc6 a6–+) 19...a6 20.Nd2 ab5 21.ab5 Ra2 22.Kd1 (22.Rhc1 e5 (22...Bh2?! 23.g3–+) 23.de5 Be5–+) 22...Rfa8 23.g3 Ne7 24.h4 Ra1 25.Ke2 R1a2 26.Kd3?? (26.Kd1 R8a4 27.h5–+) 26...R8a3 27.Rb3 Rb3 28.Nb3 b6 29.f4 Ra3 30.Ke2 (30.Ra1–+) 30...Ra2 (30...Nf5 31.Rg1–+) 31.Kd3 c6 32.g4 cb5 33.h5 Bb4 (33...Nc6 34.Kd2–+) 34.Rb1 Ra3 35.Ke2 Bc3 36.Nc1 b4 37.Nd3 Ra2 38.Nb4 Bb4 39.Rb4 Rc2 40.Kf3 Rc6 41.Ra4 f6 42.Ra7 Kf7 43.Rb7 Ke8 (better 43...g6 44.hg6 hg6 45.g5–+) 44.f5 (44.Rb8 Nc8 45.Rb7–+) 44...ef5 45.Kf4 (45.gf5 Nf5 46.Ra7 g5–+) 45...fg4 46.Kg4 Kf7 47.Kf4 Ke6 48.e4 de4 49.Ke4 g6 (49...Rd6 50.Rb8–+) 50.hg6 (50.d5 Nd5 51.Rh7 gh5 52.Rh5 b5–+) 50...hg6 51.Rb8 f5 52.Kf4 Rd6 53.Kg5 Rd4 54.Rb6 Rd6 (54...Kf7 55.Rf6 Kg7 56.Rf5 gf5 57.Kh5 Kf6 58.Kh6 Rh4) 55.Rb3 Kf7 56.Re3 (56.Kf4 Kf6–+) 56...Rf6 (56...Rd4 57.Re7 Ke7 58.Kg6 f4 59.Kg5 f3 60.Kg6 f2 61.Kf5 f1Q 62.Kg5 Qf6 63.Kh5 Rh4) 57.Kf4 (57.Rc3–+) 57...Nd5 58.Kf3 Ne3 59.Ke3 Ke6 60.Kf4 (60.Kd2 f4 61.Kd1 f3 62.Ke1 f2 63.Ke2 f1Q 64.Ke3 Rf3 65.Kd4 Qb5 66.Ke4 Qd3) 60...Rf7 (60...g5 61.Kg3 f4 62.Kg4 f3 63.Kh3 f2 64.Kg3 f1Q 65.Kg4 Qf3 66.Kg5 Qf4 67.Kh5 Rh6) 61.Kf3 (61.Ke3 f4 62.Ke2 f3 63.Ke1 f2 64.Kf1 Rf3 65.Ke2 f1Q 66.Kd2 Qg2 67.Ke1 Rf1) 61...Ke5 (61...f4 62.Ke2 f3 63.Ke3 f2 64.Ke4 f1Q 65.Kd4 Qf3 66.Kc5 Rb7 67.Kc4 Rb3 68.Kd4 Qd5) 62.Kg3 (62.Kg2 f4 63.Kh2 f3 64.Kg1 f2 65.Kf1 g5 66.Ke2 f1Q 67.Kd2 Rf2 68.Kc3 Qc1 69.Kd3 Rd2 70.Ke3 Qc3) 62...g5 (62...f4 63.Kg2 f3 64.Kg1 f2 65.Kf1 g5 66.Ke2 f1Q 67.Kd2 Rf2 68.Kc3 Qc1 69.Kd3 Rd2 70.Ke3 Qc3) 63.Kf3 (63.Kg2 f4 64.Kf1 f3 65.Kg1 f2 66.Kf1 g4 67.Ke2 f1Q 68.Kd2 Rf3 69.Kc2 Qe2 70.Kc1 Rf1) 63...Rd7 64.Ke3 (64.Kg2 Kf4 65.Kf2 g4 66.Kg1 Kg3 67.Kf1 Kf3 68.Kg1 g3 69.Kf1 Rd1) 64...Ra7 (64...g4 65.Kf2 Kf4 66.Kg1 Kg3 67.Kf1 Kf3 68.Kg1 g3 69.Kf1 Rd1) 65.Kf3 (65.Kd2 g4 66.Kc2 g3 67.Kd2 g2 68.Ke2 Ra2 69.Kd3 g1Q 70.Kc3 Qd4 71.Kb3 Rb2 72.Ka3 Qb4) 65...Ra3 (65...g4 66.Ke3 Rd7 67.Ke2 Kf4 68.Kf1 Kf3 69.Kg1 g3 70.Kf1 Rd1) 66.Kf2–+ Ke4 67.Ke2 Ra2 68.Kd1 Ke3 69.Kc1 Kd3 (69...g4 70.Kb1 Rd2 71.Ka1 g3 72.Kb1 g2 73.Kc1 g1Q) 70.Kb1 Rh2 71.Kc1 f4 72.Kb1 Kc3 73.Ka1 Kb3 74.Kb1 Rh1 0–1. alessandrocarvalhaes (1735) – Alik80 (1725), lichess.org, 2018.

3.Nc3 a5 4.Nb5 Qd7 5.e3 ab4 6.h3 (6.a3!? ba3 7.Be5=+) 6...c6–/+ 7.a4? (better 7.Nd4!?–/+) 7...cb5–+ 8.Bb5 Nc6 9.Nf3 Nf6 10.Ne5 Qc7 11.Qf3 Bd7 12.g4?? (12.Nd7 Qd7 13.Bd4–+) 12...Ne5 13.Be5 Qe5 14.Bd7 Nd7 15.0–0 e6 16.d4 Qf6 17.Qg3 Be7 18.Qc7 White prepares the advance a5 18...Rd8 (18...h5 19.g5 Qg5 20.Kh2–+) 19.Qb7 (19.f4 Qg6–+) 19...0–0 (19...h5 20.g5 Qf3 21.Qc7 Qh3 22.Qh2–+) 20.a5 (20.f4 Qg6–+) 20...e5 (better 20...Qf3 21.Qc7 e5 22.Qb7–+) 21.Qd5 ed4 22.Qd4 Ne5 23.Qb6 (23.Qf4 Nf3 24.Kg2 Nh4 25.Kh1 Qc6 26.f3 Qc2 27.Qg3–+) 23...Nf3 24.Kg2 (24.Kh1 Qe5 25.Kg2–+) 24...Nh4 25.Kg1 Qb6 (25...Qf3 26.Qb7 Qb7 27.f3 Nf3 28.Rf3 Qf3 29.Rf1 Qg3 30.Kh1 Rd2 31.Rf2 Rd1 32.Rf1 Rf1) 26.ab6 Rb8 27.Ra6 Bc5 28.b7 Rb7 29.Rc6 Be7 30.Rb1 Bf6 (30...Rd8 31.Kh1–+) 31.f4 (31.Rc4–+) 31...Bc3 (better 31...Rd7 32.Rb4 Rd1 33.Kf2 Rd2 34.Kf1–+) 32.g5?? (32.Rc3 Nf3 33.Kg2–+) 32...Nf3 (32...Re7 33.Rd1–+) 33.Kf2 Nd2 34.Rd1 Re7 35.h4 (35.Rd6 Ne4 36.Ke2 Nd6 37.Rd6 Rfe8–+) 35...Rfe8 36.Re1 (36.Kg1 Nf3 37.Kf2 Re3–+) 36...Ne4 37.Kf1 Be1 38.Ke1 Ng3 39.Rb6 (39.Rc4 Re3 40.Kd2 R3e4 41.Re4 Re4–+) 39...Re3 40.Kf2 Ne4 (40...Ra3 41.Rb8 Rb8–+) 41.Ke3 Ng5 42.Kf2 Ne4 43.Kf3 Nd2 44.Kf2 g6 45.Rb4 Kg7 46.Rb7 Rc8 47.Rb2 Nc4 48.Ra2 Kf6 49.Kf3 Nd2 (49...Nd6 50.Ra6 Ke6 51.Ra2–+) 50.Ke3 Nf1 (better 50...Nb1 51.Ra6 Kf5 52.Ra5 Kg4 53.Ra7–+) 51.Kf2 Nh2 (better 51...Rc4!? 52.Ra6 Kf5 53.Kf1 Rf4 54.Kg2 Rh4 55.Ra7–+) 52.Kg3 Nf1 53.Kf2 Nd2 54.Ke3 Nc4 55.Kd4?? (55.Kf3 Nd6 56.Ra6–+) 55...Nd6 56.c3 (56.Ra6 Ke7 57.Kd3 Rd8–+) 56...Nb5 57.Kd5 (57.Ke3–+) 57...Nc3 58.Kd4 Na2 59.Ke4 Rc4 60.Kf3 Nc3 61.Ke3 Kf5 62.Kd3 Rc7 63.Ke3 Nd1 64.Ke2 Kf4 65.Kd1 Ke3 66.Ke1 (66.h5 gh5 67.Ke1 Rc1) 66…Rc1 0–1. alessandrocarvalhaes (1700) – chessmiqueias (1625), lichess.org, 2018.

3.Nc3 a6 4.e3 Bf5 5.a3 e6 6.Nf3 Nf6 7.b5 Be7 8.d4 0–0 9.Bd3 Bd3 10.Qd3 ab5 11.Qb5 Nc6 12.Qd3 (12.Qb7?? Rfb8 13.Qa8 Ra8–+) 12...Na5 13.0–0 Nc4 14.Bc1 c6 15.e4 Qd8 (15...Na3? 16.e5 Qc7 17.ef6+–) 16.e5 Nd7 17.Ne2 Ra7 (17...c5 18.Re1=+) 18.Nd2 Ndb6 19.Nc4 (19.Qg3 Bh4 20.Qg4 Kh8=+) 19...Nc4 20.f4 Qa8 21.Rf3 f6 22.Rh3 f5 23.g4 g6 24.g5 b5 25.Rf3 b4–+ 26.h4 ba3 27.Ra2 Rb8 28.Qd1 Qb7 29.Rb3 Qc7 30.Rh3 Qa5 31.Rc3 Rb1 32.Kf2 Rab7 33.Rb3 Qa4?? 34.Nc3= Qb3 35.cb3+/– R7b3?? 36.Nb1+– Rb1 37.Qc2 Rb5 38.Qc3 Ra5 39.Ke2 Kf7 40.Bd2 Rb5 41.Bc1 Ra5 42.Qb3 Rb5 43.Qa4 Rb6 44.Qa7 Rb5 45.Ba3 Na3 46.Ra3 Rb2 47.Kd1 Rf2 48.Rb3 (48.Rb3 Kf8 49.Rb8 Kf7 50.Rb7+–) 1–0. Eidsson,Johann Oli – Petursson,Mat (1900), ch–Reykjavik, 2008.

3.Nc3 Qb4 4.Nd5 Qc4 5.Ne3 Qb5 6.Qc1 Bd7 7.Rb1 Qa6 8.Be5 Be6 9.Qb2 Qa2 10.Qb7 Bd7 11.Rb2 Qa1 12.Nd1 f6 13.Qa8 Kf7 14.Rb8 Qe5 15.Rf8 Kg6 16.Rg8 Rg8 17.Qg8 Qc5 18.c3 h5 19.Nf3 e5 20.Nh4 Kg5 21.Qg7 Kf4 22.Qg3 Ke4 23.Qf3# 1–0. Green Light Chess v2.15c – Pentagon 1.3, computer chess game, 2001

3.Nc3 d4 4.Nb5 Qb6 5.e3 a6 6.Bd4 Qc6 7.Na7 Qd7 8.Nc8 Qc8 9.Nf3 Nc6 10.Bc3 f6 11.b5 Na7 12.ba6 ba6 13.Rb1 e5 14.d4 Qe6 15.de5 1–0. marus1 – sonofosiris2, internet, 2001.

3.Nc3 Bd7 4.e3 e5 5.Nf3 Nf6 6.a3 e4 7.Nd4 Qb6 8.Be2 c5 9.bc5 Bc5 (< 9...Qb2 10.Ndb5 Bb5 11.Bb5 Nbd7 12.Ra2 Qa2 13.Na2 Bc5 14.Bd7 Kd7 15.Qb1+/–; 9...Qc5?! 10.a4=) 10.Nb3 Bd6 11.0–0 (11.d3 0–0=) 11...0–0 12.Rb1 (12.f4 Rc8=) 12...Qc7 13.h3 Rc8 14.f3 a6 (14...Bh2!? 15.Kh1 Be5=) 15.fe4+= de4 (15...Ne4 16.Nd5 Bh2 17.Kh1 Ng3 18.Kh2 Nf1 19.Kg1+–) 16.Rf6 gf6 17.Ne4 Bh2 (17...Be5 18.Bd3 f5 19.Nf6 Bf6 20.Bf6+=) 18.Kh1 (18.Kf2 Be5+=) 18...Be5 19.Bd3 Bb2 (19...f5 20.Nf6 Bf6 21.Bf6+/–) 20.Rb2+/– Qe5 21.Nd4 Ra7 22.Qf3 Kg7 23.Ng3 b5 24.Nh5 Kf8 25.Nf6 h6 26.Rb1 Rac7 27.Rf1 Be6 28.Ne6 Qe6 29.Qh5 Kg7 30.Ng4 Nd7 31.Nh6! f6 32.Qg6 Kf8 33.Rf4 Ra8 34.Rg4 Ke7 35.Nf5 (35.Nf5 Kd8 36.Qg8 Qe8 37.Qd5+–) 1–0. fuiste – AllegroConBrio, ajedrez21.com, 2001.

3.c4 dc4 (3...Qb4 4.Qb3 Qc4 5.Qc4 dc4 6.Na3–/+) 4.Qa4 Bd7 5.b5 Na6 (5...c6!? 6.Qc4 cb5–/+) 6.Qc4= Nc5 (6...Qb4 7.Qb4 Nb4 8.Na3=+) 7.e3 (7.Nf3 Nf6+=) 7...e5 8.Nf3 f6 (8...e4 9.d4 ed3 10.Bd4=+) 9.d4= ed4 10.Nd4 Nh6 11.h3 (11.Nc3 Ng4 12.Rd1 A) 12...Nh2? 13.Nb3 Be6 14.Qh4+– (14.Rd6?! Bc4 15.Bc4 Bd6 16.Nc5 Nf3 17.gf3 Bc5+–); B) 12...Ne5+=) 11...Nf5 12.a4 Nd4 13.Bd4 Be6?? (better 13...Ne6=) 14.Bc5+– Bc4 15.Bd6 Bf1 16.Bc7?? (better 16.Bf8 Bg2 17.Rh2 (17.Bg7?! Rg8=) 17...Rf8 18.Rg2+–) 16...Bg2=+ 17.Rg1 (17.Rh2 Bd5 18.Nd2 Rc8=+) 17...Bb4 (better 17...Bh3!? 18.a5 h5–/+) 18.Ke2 Bh3 19.Rg7 h5 20.Nd2 (20.Bf4 Bg4 21.f3 Bd7=) 20...Rc8 (20...Bg4 21.f3 Kf8 22.Rg4 hg4 23.fg4–/+) 21.Rc1 (better 21.Bf4 Rd8 22.e4=) 21...Bg4–/+ 22.f3 White gets strong initiative 22...Bd2 (22...Bf8 23.Rg6 Kf7 24.fg4 Kg6 25.gh5 Rh5 26.Rg1 Rg5 27.Bg3–+) 23.Kd2 Bf3 (better 23...Kf8 24.Rg4 hg4 25.fg4 Ke8–+) 24.Rf1= Bg4 (24...Kf8 25.Rd7 Ke8 26.Rg7=) 25.Rf6 (better 25.Bd6 f5 26.Rf4+–) 25...Bd7?? (better 25...Rf8 26.Rf4 Rf4 27.ef4 Bf5+=) 26.Bd6+– h4 (26...a6 27.Rff7 Bg4 28.Rb7 ab5 29.ab5+–) 27.Re7 (27.Rff7 Bh3 28.Re7 Kd8 29.Rb7 Be6 30.Be7 Ke8+–) 27...Kd8 28.Rff7 The mate threat is Rxd7 28...h3 (28...Bh3+–) 29.Rd7 Ke8 30.Rfe7 Kf8 31.Rf7 (31.Re6 Kg8 32.Rg6) 31...Ke8 32.Rfe7 (32.b6 Rc7 33.Rfe7 Kf8 34.Rd8) 32...Kf8 33.Rh7 (33.Re6 Kg8 34.Rg6) 33...Kg8 (33...Ke8 34.Rde7 Kd8 35.Rh8) 34.Rdg7 (34.Rhg7) 1–0. MARYMARY – BIG__MAZY, ChessWorld.net, 2018.

3.e3 Nf6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 Qd6).

3.Nf3 Bg4 4.a3 Nd7 5.e3 e5 6.h3 Bf3 7.Qf3 Ngf6 8.Be2 c5 9.bc5 Qc5 10.Nc3 e4 11.Qf5 g6 12.Qg5 h6 13.Qg3 Bd6 14.f4 g5 15.Nb5 Rg8 16.Nd6 Qd6 17.0–0 Nh7 18.d4 f5 19.c4 Nhf6 20.cd5 (20.c5!? Qc7 21.Rab1+=) 20...Nd5 21.Rac1 N7f6 22.Bb5 Ke7 23.Qf2 g4 24.hg4? (better is 24.h4+=) 24...Ng4–+ (24...Rg4?! 25.Rfe1–/+) 25.Qh4 Kf7 26.Qh5 Qg6 27.Qg6 Rg6 28.Bd7? (28.Be2 Rag8 29.Bc4 Nge3 30.Bd5 Nd5 31.Rc2–+) 28...Nge3 29.Rc7 (29.Rf2 Rag8 30.Kh1 Rg2 31.Rg2 Rg2 32.Rb1–+) 29...Nc7 30.Rc1 Rg2 (30...Rg2 31.Kh1 Rg4 32.Be8 Ne8–+) 0–1. Yannick – Mrempel, playchess.de, 2005.

3.h4 Qb4–/+ 4.Qc1 Nc6 5.Nf3 Bg4 6.Nh2 Bd7 7.h5 (7.Nf3 Nf6–/+) 7...e5 8.Ba3 Qh4 9.Bf8 Kf8 10.Qa3 Ke8 11.Qb3 Nf6 12.Qb7? (better 12.h6 Qh6 13.Nc3–+) 12...Rb8 13.Qc7 Ne4 (better 13...Qb4 14.Nc3 Rc8 15.Qc8 Bc8–+) 14.g3 Ng3 (14...Qh5?! 15.Nf3 Qh1 16.Ne5–/+) 15.fg3 Qg3 16.Kd1 Ke7 17.Nc3 Ke6?? (better 17...Rhc8 18.Nd5 Ke6 19.Qc8 Rc8–+) 18.Nf3+– Rhc8 (18...f5 19.Bh3 Rhd8 20.Rg1+–) 19.Bh3 f5 (19...Qh3 20.Ng5 Kf6 21.Nh7 Ke6 22.Ng5 Kf6 23.Nh3 Rc7 24.Nd5 Ke6 25.Nc7 Kd6+–) 20.Bf5 Kf5 21.Qd7 Kf6 (21...Kf4 22.Nd5 Ke4 23.d3) 22.Nd5 1–0. beatmeeasy (1880) – taher1 (1905), lichess.org, 2021.

3.a3 a6

4.e3 e6 5.d4 f6 6.c4 c6 7.Bd3 e5 8.Qh5+– Ke7 9.de5 Qe6 10.Nd2 h6 11.cd5 Qd5?? 12.Bc4 (12.Bc4 Bg4 13.Qg4+– (13.Bd5?! Bh5 14.Bf3 Bf7+–)) 1–0. Fournier,Frederic (1990) – NN, Active, 2004.

4.Nf3 Nc6 5.e3 Bg4 6.h3 Bh5 7.d3 e5 8.Nbd2 Nf6 9.c4 Be7 (better is 9...d4!?=) 10.g4+/– Bg4? (better is 10...Bg6 11.b5 ab5 12.cb5 Na5 13.Be5 Qb6+/–) 11.hg4+– Ng4 12.Nh4 (12.b5 ab5 13.cb5 Nd8+–) 12...Nh6 13.Qh5 d4 (13...Bf6 14.Rc1+–) 14.Ne4 Qe6 (14...Qd7 15.b5 ab5+–) 15.Bh3 Bb4 16.ab4 Qe7 17.ed4 (17.Ke2 Nb4 18.Rag1 Kf8 19.ed4 f5 20.Nf5 Qf7 21.Qf7 Nf7+–) 17...ed4 (17...Nd4 18.Rg1 Nc2 19.Kf1 Na1 20.Rg7+–) 18.0–0–0 b5 (18...Qe5 19.Ng5 Qf6+–) 19.Qd5 0–0 20.Nf5 Nf5 21.Bf5 Nb4 22.Bh7 1–0. pcmvr – sgp (2485), net–chess.com, 2014.

3.a3 b5

4.e3 e5 5.Bb5+– c6 6.Ba4 Bd7 (6...Nd7 7.Nf3 Ne7 8.d3+–) 7.Nf3 Nf6? (7...e4 8.Ne5+–) 8.h3 (8.Be5 Qe6+–) 8...a5? (8...e4 9.Nd4+–) 9.c3 (better 9.Be5!? Qe6 10.c3+–) 9...g6 (9...e4 10.Nd4+=) 10.0–0 (10.c4 e4 11.c5 Qe7+–) 10...Bg7 (10...e4 11.Nd4+–) 11.Bb3 (11.d4 ed4 12.Nd4 0–0+–) 11...0–0+= 12.d3 ab4 (12...Re8 13.Nbd2+–) 13.ab4 (13.cb4!? Re8 14.Qc2+–) 13...Ra1+= 14.Ba1 e4 (14...Bf5 15.Qc2+=) 15.Nh2 (15.de4 Ne4 16.Nd4 c5 17.bc5 Nc5+–) 15...Na6 (15...ed3 16.Qd3 Bf5 17.Qd1=) 16.d4 (16.Bb2 Re8+=) 16...Bf5 (16...Ra8 17.Nd2=) 17.Nd2 (better 17.Bb2+=) 17...Nb4? (better 17...Ra8+=) 18.cb4+– Qb4 19.Qc2 Qa3 (19...Ra8 A) 20.Qc6 Rc8 21.Bc3 Qc3 (21...Rc6?? 22.Bb4 h6 23.g4+–) 22.Qc3 Rc3=+; B) 20.Bb2+–) 20.Bb2 (20.Qc6 Rc8 21.Qb5 Bd7+–) 20...Qe7 (20...Qa6 21.Ra1 Qd3 22.Ra7+–) 21.Qc6 Qb4 (21...Rc8 22.Qa6+–) 22.Qc2 (better 22.Bc3 Qb8 23.Rc1 Rc8+–) 22...Nd7 (22...Rc8 23.Qd1+–) 23.Rb1 (23.Bd5 Nf6 24.Bc4 Rc8+–) 23...Qd6 (23...Nb6 24.Qc5 Qd2 25.Qb6+–) 24.Ra1 Bd4 (24...Nf6 25.Ba3 Qa6+–) 25.Bd4 f6 (25...Rb8 26.Ra7+–) 26.Ba4 (26.Qa2 Be6 27.Ne4 de4 28.Be6 Kg7 29.Bd7 Qd7+–) 26...Ne5 (26...Ra8 27.Ng4 Bg4 28.hg4+–) 27.Bc5 Qe6 (27...Qc7 28.Bf8 Qc2 29.Bc2 Kf8 30.Bb3+–) 28.Bf8 Kf8 29.Bb3 (better 29.Qc5 Kg7 30.Bb3 Nd7+–) 29...Kg7 (29...Qd6 30.Qa2 Be6 31.Qa8 Kg7 32.Ra6+–) 30.Ra7 (30.g4 Bg4 31.hg4 Qd7+–) 30...Kh6 31.Ra5 (31.Qc5 Nd7 32.Qd4 Qb6 33.Bd5 Qd4 34.ed4 Nb6+–) 31...g5 (31...Qb6 32.Rd5 Be6 33.Rc5 Bb3 34.Nb3+–) 32.Rd5 (better 32.Bd5 Qb6 33.Ra8 Qb4+–) 32...Bh3 (32...Qb6+–) 33.gh3 Qh3 34.Ndf1 (34.Re5 Qd7 35.Ne4 fe5 36.Nf6 Kg7 37.Qh7 Kf6 38.Qd7 g4 39.Qd6 Kg5 40.Bf7 g3 41.f4 ef4 42.Qf4) 34...Nf3 35.Nf3 (better 35.Kh1 Nh2 36.Nh2+–) 35...Qg4 (35...ef3 36.Rg5! Kg5 37.Qc5 Kg6 38.Bc2 f5 39.Qd6 Kg5+–) 36.Ng3 Qf3 (36...Qe6 37.Rd8 Qc8 38.Qc8 g4 39.Rg8 gf3 40.Qf8) 37.Qd1 (37.Qc8 Kg7 38.Rd7 Kh6 39.Qf8 Kg6 40.Qg7) 37...Qd1+– 38.Bd1 (38.Bd1 Kg6 39.Bh5 Kh6 40.Be8 g4 41.Nf5 Kg5 42.Nd4 Kh6 43.Ne6 f5 44.Rf5 g3 45.Rh5) 1–0. grahamtrue – aweepawn, net–chess.com, 2017.

4.e3 e5 5.Bb5 c6 6.Ba4 Nf6 7.Nf3 Nbd7 8.0–0 Ba6 9.Ne5 (9.d3!? Be7 10.Nbd2+–) 9...Ne5+= 10.Be5 Qe5 11.Bc6 Nd7 (11...Kd8 12.d4 Qb8 13.Ba8 Qa8 14.Re1+=) 12.d4+– Qg5?? (better 12...Qb8 13.Re1 Bb7+–) 13.Ba8+– Bd6 14.Nc3 0–0 (14...Bf1 15.Kf1 Bh2 16.Bd5+–) 15.Bd5 Nf6 (15...Bf1 16.Qf1 Rc8 17.Qb5+–) 16.f4 Qh4 (16...Qh6 17.Rf3 Rc8 18.Rh3+–) 17.Rf3 Ng4 (17...Nd5 18.Nd5 Bc4 19.e4+–) 18.h3 Re8 (18...Nf6 19.Bc6 Bc7+–) 19.hg4 Qg4 (19...Bc8 20.Ne4 Re4 21.Be4 Bg4 22.Qe1+–) 20.Ne4 Re4 (20...Bb8 21.Ng5 Re7 22.Nh7+–) 21.Be4 f5 22.Bd5 Kf8 23.c4 Bc4 24.Bc4 g5 25.Qa4 gf4 26.Qd7 Be7 (26...Qg6 27.ef4 Qe8 28.Qf5 Ke7 29.Re1 Kd8 30.Qa5 Bc7 31.Re8 Ke8 32.Qc7 h5 33.Re3 Kf8 34.Qe7) 27.Qc8 Kg7 28.Qg8 Kf6 (28...Kh6 29.Qe6 Kh5 30.Qe7 Qg3 31.Qh7 Kg5 32.ef4 Qf4 33.Qg7 Kh5 34.Rf4 a6 35.Be2) 29.Qf7 Kg5 30.Qg7 Kh4 (30...Kh5 31.Bf7 Qg6 32.Qh7 Kg4 33.Rf4 Kg3 34.Qh3) 31.Rh3 (31.Qh6 Qh5 32.Qf4 Qg4 33.Rh3) 31...Qh3 32.Bf7 (32.Qh6 Kg4 33.Qf4 Kh5 34.Bf7) 32...Bg5 33.Qh7 Kg4 (33...Bh6 34.Qh6 Kg3 35.Qh3) 34.Qh3 1–0. Anonymous – Anonymous, lichess.org, 2020.

4.e3 Nf6 5.Bb5+– Bd7 6.Bd3 (6.Be2 e5+–) 6...a6 (6...e5 7.Be2+–) 7.Nf3 Ng4 (7...Bg4 8.c4+–) 8.h3 Nf2? (better 8...Nf6+–) 9.Kf2 h5 (9...Bb5 10.Qe2 Bd3 11.Qd3+–) 10.Rf1 (10.Be5 Qb6+–) 10...h4 (10...Bb5 11.Qe2 Bd3 12.Qd3+–) 11.Kg1 Qg3 (11...Rh5+–) 12.Be5 Qg2 (12...f6 13.Bg3 hg3 14.e4 de4 15.Be4+–) 13.Kg2 Bh3 14.Kh3 f6 15.Bc7 (better 15.Nd4 Nd7 16.Bc7 f5+–) 15...e5 16.Ne5! Rh6 (16...fe5 17.Qg4 Mate attack) 17.Ng4 (17.Qg4 f5 18.Qf5 Rf6 19.Qc8 Ke7 20.Bd8 Kd6 21.Rf6 gf6 22.Nf7) 17...Rh5 18.Bb8 (18.Nf6 gf6 19.Qh5 Kd7 20.Bb8 Rb8 21.Qd5 Kc7 22.Qf7 Kd8 23.Qf8 Kd7 24.Qg7 Kd8 25.Rf6 Rb4 26.Rf8) 18...Rg5 19.Bf4 Rh5 20.Nf6 Kd8 (20...Kf7 21.Qh5 g6 22.Qd5 Kg7 23.Qg8 Kf6 24.Bd6 Kg5 25.Qg6) 21.Nh5 (21.Qh5 Ke7 22.Qe5 Kf7 23.Qd5 Ke7 24.Bd6 Kd8 25.Qa8) 21...a5 22.b5 (22.Qf3 Ke8 23.Bb5 Kd8 24.Qd5 Bd6 25.Qd6 Kc8 26.Qc7) 22...a4 23.Qg4 (23.Qf3 Ra6 24.Qd5 Rd6 25.Bd6 Be7 26.Be5 Bd6 27.Qd6 Kc8 28.Qc7) 23...Ba3 (23...g5 24.Qg5 Ke8 25.Bg6 Kd7 26.Qf5 Kd8 27.Qf8 Kd7 28.Bf5) 24.Na3 (24.Qg5 Kc8 25.Qf5 Kd8 26.Qd5 Bd6 27.Qd6 Ke8 28.Bg6) 24...Ra7 (24...Ke7 25.Qg7 Ke6 26.Qe5 Kd7 27.Nf6 Kd8 28.Qc7) 25.Ng7 (25.Bg5 Kc7 26.Rf7 Kb8 27.Qf4 Ka8 28.Rf8 Kb7 29.Qb8) 25...Rg7 (25...Rf7 26.Bg5 Rf6 27.Bf6 Kc7 28.Be5 Kd8 29.Qe6 d4 30.Rf8) 26.Qg7 (26.Qg7 Ke8 27.Bg6 Kd8 28.Qc7) 1–0. Abdullaevich (1985) – cengozhan, lichess.org, 2020.

3.a3 Qb6

4.e3 c5 5.b5 a6 6.a4 c4 7.g3 (7.Nc3 Nf6=) 7...ab5=+ 8.Bd4 Qc6?? (better 8...Qd6 9.ab5 Ra1 10.Ba1 e5=) 9.ab5+– Qg6 (9...Ra1 10.bc6 Ra5 11.cb7 Bb7+–) 10.Ra8 Qd6 11.Nc3 (11.Ba7 Qd7 12.Rb8 e6+–) 11...e5 (11...Nf6 12.Bf6 ef6 13.Qf3+–) 12.Ba7 d4 13.Ne4 Qg6 (13...Qe6 14.Rb8 c3 15.Bh3+–) 14.Bg2 (14.Rb8 Kd8 15.Qf3 f5 16.Bc4 de3+–) 14...Bb4 (14...de3 15.fe3 f5 16.Rb8+–) 15.Rb8 Ne7 16.c3 (16.ed4 ed4 17.Qe2 d3 18.cd3 cd3 19.Qd3 0–0+–) 16...dc3 (16...Bd6 17.Nd6 Qd6 18.cd4 ed4 19.Qa4+–) 17.dc3 Ba5 (17...f5 18.cb4 fe4 19.Qc2+–) 18.Ne2 (better 18.Nd6 Qd6 19.Qd6 Bc3 20.Kf1 e4+–) 18...0–0 (18...Bc7 19.Ra8 0–0 20.Qa4+–) 19.Ra8 (better 19.Qd6 Qe6+–) 19...Be6 (19...Rd8 20.Nd2 b6 21.Bb8+–) 20.Rf8 (20.Rf8 Kf8 21.Bc5+–) 1–0. Delboy Smith (1865) – cheetahpop (1835), ChessWorld.net, 2013.

4.e3 Qg6 5.Nf3 Bg4 6.Be2 Nf6 7.Ne5 Qe4?? 8.f3+– Bf3 9.Bf3 Qh4 10.g3 Qg5 11.0–0 Ng4 12.Ng4 e6 13.Bg2 1–0. Fournier,Frederic (1785) – taurus67(C) (1775), Active (5/0), 2004.

4.g3 a5 5.c3 (5.Nc3 Nf6=) 5...Bd7 6.Bg2 Bc6 7.Nf3 Nf6 8.d4 Nbd7 9.Nbd2 e6 10.e3 Bd6 11.Qc2 e5 (11...ab4 12.cb4 Ba4 13.Nb3=+) 12.Ng5 (better 12.c4!? dc4 13.de5+–) 12...h6 13.Nh3 0–0 14.Ng1 Bb5 (14...ab4 15.cb4 e4 16.Ne2–/+) 15.Ngf3 (15.a4!? Bc4 16.Nc4 dc4 17.b5=) 15...ed4 (15...e4!? 16.Nh4 Bd3–/+) 16.Nd4=+ Rfe8 (16...Ne5 17.Nb5 Qb5 18.c4 dc4 19.a4=) 17.N2f3 (17.Nb5 Qb5 18.c4 dc4 19.Qc4 Qf5=) 17...c5 (17...Bc4 18.Nd2=+) 18.bc5 Nc5 19.Bh3?? (better 19.Nb5 Qb5 20.Bf1=) 19...Nd3–+ 20.Kd2 Nf2 (better 20...Ne4 21.Ke2 Nb4 22.c4 Nc2 23.cb5–+) 21.Rhb1 (21.Qb3 N6e4 (21...Nh3?! 22.Qb5 Qc7 23.Rhf1–+; 21...Nh1?! 22.Qb5 Qb5 23.Nb5–+) 22.Ke1 Nh1 23.Qb5 Qc7–+) 21...Nh3 (better 21...N6e4!? 22.Ke1 Bd3 23.Bc1–+) 22.a4 (22.Bc1–+) 22...Bc4 23.Ba3 Qc7 24.Nb5 (24.Bd6 Qd6 25.Rb7 Ne4 26.Kc1 Nc5–+) 24...Bb5 (better 24...Qe7 25.Re1 Ne4 26.Kc1 Ba3 27.Na3–+) 25.Rb5 (25.Bd6 Qd6 26.Rb5 Ne4 27.Kc1 Nc3 28.Rb3–+) 25...Ba3 26.Ra3 Ng5 (better 26...Qe7 27.Qc1 Qe3 28.Kc2 Qf3 29.Kb1–+) 27.Nd4 (27.Ng5 Qe7 28.Qc1 Qe3 29.Kc2 Qf2 30.Kb3 Re1–+) 27...Nfe4 28.Ke2 Rac8 29.Rab3 (29.Rbb3 Qc4 30.Qd3 Qd3 31.Kd3 Nc5 32.Ke2 Nb3 33.Rb3 Rc7–+) 29...Nc3 30.Kd3 (30.Rc3 Qc3 31.Qc3 Rc3 32.Nf5–+) 30…Nb5 (30...Nb5 31.Qc7 Nc7 32.Rb7 Na6–+) 0–1. alessandrocarvalhaes (1845) – JoSchi61 (1865), lichess.org, 2020.

3.a3 d4

4.e3 de3 5.fe3 e5 6.Nf3 e4 7.Nd4 c6 8.c4 Be7 9.Qb3 Bg4 10.Be2 Qg6 (10...Be2 11.Ne2 Bh4 12.g3=) 11.Nc3 (11.Bg4 Qg4 12.0–0 Nf6+=) 11...Nd7 (better is 11...Be2 12.Nde2 Qg2=) 12.0–0–0?? (better is 12.Bg4 Qg4 13.0–0+/–) 12...Ne5 13.Rdf1 Be2 14.Nce2 Nd3 (14...Qg2?! 15.Nf4 Qg4 16.Rhg1=) 15.Kc2 Nb2 (15...Rd8 16.g3–/+) 16.Qb2 0–0–0 17.Rf5 (17.Nf4 Qg5–/+) 17...Nh6 (17...Qg2 18.Qa1 Nh6 19.Ra5–/+) 18.Ra5 Kb8 19.Qb3? Bf6 20.b5 Bd4 21.Nd4 Rd4 22.ed4 Nf5 23.Kb2 Nd4 24.Qg3 Qg3 25.hg3 b6 26.Ra6? cb5 27.cb5 Nb5 28.Ra4 Rd8 29.Kc1 Nd4+= 30.Rh7 Nb3 31.Kc2 Nc5 32.Rc4 Rg8 33.d4 ed3+= 34.Kd2 f5 35.Rch4 Ne4 36.Kd3+= Rd8 37.Ke3 Rd7 38.g4 Nd6 39.Kf4 fg4 40.Kg4 b5 41.Kg5 Kc7 42.Kg6 a5 43.Rh1 Nc4 44.Rg7 Na3= 45.g4 Nc4? 46.Rd7+/– Kd7 47.g5 Nd6 48.Kg7 b4 49.g6 b3 50.Rd1 Ke7? 51.Re1 Kd7 52.Kf6 b2 53.g7 Ne8 54.Re8! b1Q 55.Re7 Kd6 56.Re6 Kd7 57.g8Q Qb2 58.Re5 Qf2 59.Rf5 Qb6 60.Kg7 Qd4 61.Rf6 Qg4 62.Kh8 Qd4 63.Qg7 1–0. Dudyev,Vladimir – Sulejmanova,Ava (2220), Rodatychi op, 2006.

4.Nf3 Qd5 5.Nd4 e5 6.Nb3 Be6 7.Nc3 Qd7 8.e4 h5 9.Nc5 Qd6 10.Nb7 Qb6 11.Na5 Be7 12.Bc4 Bg4 13.Be2 Qd4 14.Nd5 Qb2 15.Nc7 Kd8 16.Na8 Qd4 17.0–0 Qe4 18.Bg4 Nh6 19.Bf3 Qg6 20.Nc6 Nc6 21.Bc6 Qc6 22.Qh5 Qa8 23.Qe5 Ng4 24.Qd4 Bd6 25.Qd6 Kc8 26.h3 Rh6 27.Qf8 1–0. Trkn – Darren, itsyourturn.com, 2000.

4.Nf3 e5 5.h3 b6 (5...Be6!?=) 6.e3+= de3 7.fe3 (7.Be5 ef2 8.Kf2 Qd7+=) 7...f6 (7...e4!? 8.Ne5 Be6=+) 8.Nc3 c6 9.Ne4 (9.Be2 a5 10.b5 Be6+=) 9...Qc7 10.Bc4 Nd7 11.Nh4 Nh6 12.Qh5 Kd8 13.0–0 Be7 (13...Bb7!? 14.Qf3 b5=) 14.d4+– Bb7? (14...ed4 15.Bd4 a5 16.Rad1 ab4 17.ab4 Bb4 18.Rf6+–) 15.Rad1 (15.de5 Ne5 16.Be6 Bc8 17.Rad1 Nd7 18.Rd7 Bd7+–) 15...Kc8 (15...g6 16.Qh6 Bf8 17.de5 Bh6+–) 16.Be6+– c5?? (16...Kb8 17.Bd7 Qd7 18.de5 Qe8 19.Qe8 Re8 20.ef6 gf6 21.Nf6 Rd8+–) 17.dc5 (better 17.de5 Be4 18.Rd7 Qd7 19.Bd7 Kd7 20.ef6 gf6 21.Bf6+–) 17...Bc6 18.Nd6 Kb8? (18...Bd6 19.cd6 Qd8+–) 19.b5 (better 19.Ne8 Qc8 20.Ng7+–) 19...Nc5= 20.bc6 The passed pawn on c6 will become decisive later 20...Bd6 (worse 20...Ne6 21.Ne8 Qc6 22.Ng7 Ng7 23.Qh6+–) 21.Bd5 a5 (21...Na4 22.Ba1=) 22.Nf5 (better 22.e4!?+–) 22...Nf5= 23.Qf5 (23.Rf5?? g6 24.Qf3 gf5 25.Qf5 Na4–+) 23...Ka7 (23...Na4!? 24.Ba1 Ba3=) 24.e4 Rad8 25.Rfe1 Na4 26.Bc1 b5 (26...Bc5!? 27.Kh1 Bd4+=) 27.Be3+– Bc5 28.Qf2 Qe7 29.Rb1 Rb8 30.Qd2 Threatening mate: Qxa5 30...Ka6 31.Rb3 Ba3? (31...Rhc8!?+–) 32.Ra1 (32.c7 Rb6 33.Ra1 Bc5+–) 32...Bb4 33.c3 Bc3 (better 33...Nc3 34.Rc3 Qc7+–) 34.Rc3 Nc3 35.Qc3 Qc7 36.Bd2 a4 (36...b4 37.Bc4 Ka7 38.Qe3 Ka8+–) 37.Be3 (37.Qb4 Qb6 38.Kf1 Rbd8 39.Ra4 ba4 40.Qa4 Qa5 41.Qa5) 37...Rhe8 (37...Rhd8+–) 38.Bb3 Rec8 39.Ba4! Qa5 (39...ba4 40.Ra4 Decoy theme: a4) 40.Bb5! Rb5 (40...Kb5 Decoy to b5 41.Ra5 The nicest combinations are those leading to mate) 41.Ra5 Ra5 42.c7 Rb5 (42...Kb7 43.Qb4 Kc7 44.Qa5 Kd6 45.Qd5 Kc7 46.Qf7 Kd6 47.Qg7 Rc7 48.Qf6 Kd7 49.Qg7 Kc8 50.Qe5 Rc6+–) 43.Qc6 Ka5 44.Bd2 Rb4 45.Bb4 Kb4 46.Qb7 Kc3 47.Qc8 Kd3 (47...Kc4 48.Qd7 Kb3 49.c8Q Ka3 50.Qc2 Kb4 51.Qda4) 48.Qb7 Ke3 (48...g5 49.Kf2 g4 50.Qd5 Kc3 51.c8Q Kb4 52.Qcc5 Ka4 53.Qdc4) 49.c8Q Kf4 (49...h6 50.Qc3 Ke2 51.Qb5 Kd1 52.Qbd3) 50.Qf5 Ke3 51.Qf3 (51.Qd5 h6 52.Qf3) 51...Kd2 52.Qb2 Ke1 53.Qf1 (53.Qbc3) 1–0. petrobbo (2005) – Derek Lewis (2035), ChessWorld.net, 2012.

3.a3 Bd7

4.e3 a6 5.Nf3+= c5 (5...Nc6 6.c4+=) 6.bc5 (6.Be5 Qc6+=) 6...Qc5 7.Be2 (7.Bd4 Qd6+=) 7...Nc6= 8.0–0 Nf6 9.d4 (9.Bf6 gf6 10.d4 Qd6+=) 9...Qd6 (9...Qb6 10.Ra2=) 10.c4 (10.Nbd2 b5+=) 10...dc4= 11.Bc4 b5 (11...e6 12.Bd3+=) 12.Bd3+= Bg4 (12...Rc8 13.e4 Qf4 14.Qd2+=) 13.Nbd2 e5 (better 13...e6+=) 14.e4 (better 14.a4!? ed4 15.ab5+–) 14...Nd4 (14...ed4 15.e5 Ne5 16.Qe1=+) 15.h3 (15.Bd4 Nd7= (15...ed4? 16.e5 Qe7 17.ef6 Qf6 18.Re1 Be7 19.Qb1+–)) 15...Bf3 (15...Rd8 16.Bd4 Qd4 17.Bb5 ab5 18.hg4=+) 16.Nf3=+ Nf3 17.Qf3 Be7 (17...Nd7 18.Rfd1 Qe6 19.Bc2=) 18.Qg3 0–0 19.Be5 (19.Rfd1 Rfd8=) 19...Qe6 20.f4 (20.Bb2 Rfd8 21.Rfd1 Rac8=) 20...Bd8 (20...Rac8 21.a4=) 21.f5 (21.a4+=) 21...Bb6 (21...Qb6 22.Kh1=) 22.Kh1 (22.Kh2!? Qe7 23.Bd6+–) 22...Qd7?? (better 22...Qe7 23.Bd6 Nh5+–) 23.Bf6+– (23.Bf6 g6 24.e5+–) 1–0. GuestHDRX – GuestZGPN, freechess.org, 2018.

4.e3 e5 5.Nf3 e4 6.Ne5=.

4.Nf3 a5 5.Be5+= Qa6 6.Bc7 Nc6? 7.e4!+– Qa7 8.b5 Nd8 9.b6 (9.b6 Ne6 10.ba7 Nc7 11.Ne5+–; 9.ed5?! Qc5 10.Be5 f6+–) 1–0. Wall,Bill – Guest8537, internet, 2005.

3.a3 Be6

4.e3 d4 5.Bd4+– Nc6 6.b5?? (better 6.Bc5 Qd7 7.b5+–) 6...Nd4=+ 7.ed4 f5 (better 7...Qd4!? 8.Nc3 Nf6=) 8.Nf3+= g6 9.Qe2 f4 (9...Bg7 10.Nc3+=) 10.Ne5 (10.c4 Nf6+–) 10...Bh6 (10...Qd4 11.c3 Qd5 12.d4=) 11.g3 (11.c3 Nf6+–) 11...fg3 (11...Qd4 12.c3 Qd5 13.Rg1=) 12.fg3 (12.hg3 Qd4 13.c3 Qd5+=) 12...Nf6 (12...Qd4 13.c3 Qd6 14.Bg2=) 13.Bg2 (better 13.c3+=) 13...Nd5? (13...Qd4 14.c3 Qb6 15.a4+=) 14.0–0 (14.c4 Nb6 15.Bb7 Qd4 16.Bc6 Nd7 17.Ra2+– (17.Ba8? Ne5 18.Qe4 Qa1–+)) 14...Nb4? (better 14...Nf4 15.gf4 Qd4 16.Kh1 Qa1 17.Bb7 Rd8+–) 15.Nc3 (15.Nc3 Nc2 16.Bb7 Nd4 17.Qf2+=; 15.ab4?! Qd4 16.Kh1 Qa1+–) 1–0. Agiant – ParhamPanahi, lichess.org, 2018.

4.e3 Nd7 5.Nf3 0–0–0 (5...Ngf6 6.Nc3+=) 6.d4 (6.Nc3 c6+=) 6...h6 (6...Ngf6 7.Nc3=) 7.Be2 g5 (7...Ngf6 8.Nbd2+=) 8.0–0 (8.c4 c6 9.cd5 Bd5 10.Nc3+–) 8...f5? (8...Ngf6 9.Nbd2=) 9.Nbd2 (9.c4 Bf7+– (9...dc4?? 10.d5+–)) 9...g4 10.Ne1 (10.Ne5 Bg7 11.c4 A) 11...Be5? 12.c5 Qc6 13.b5 (worse 13.de5 a6+–) 13...Qc5 14.dc5 (14.de5?! Qb6+–) 14...Bb2 15.Rb1+–; B) 11...Ne5 12.de5 Qd7+– (worse 12...Be5 13.c5 Qc6 14.Be5+–)) 10...h5 (10...Nb6 11.Nd3 Na4 12.c4 Nb2 13.Nb2+=) 11.c4 h4?? (better 11...dc4 12.Nc4 Bc4 13.Bc4 h4+=) 12.c5+– Nc5 13.dc5 Qd7 14.Bh8 g3 (14...Nf6 15.Nc2 Bh6 16.Bf6 ef6 17.Nd4+–) 15.fg3 hg3 16.hg3 Bh6 (16...Nf6 17.Nc2+–) 17.Bd4 Nf6 (17...c6 18.Qa4 a6 19.Nd3+–) 18.Nef3 (18.b5!? c6 19.Qa4 Rg8+–) 18...Ng4 19.Qb3 (19.Qe1 Bg8 20.Bd3 Bh7+–) 19...c6 (19...Bg8 20.Qc3 Qe6 21.Rfe1+–) 20.Ne5 (better 20.Qd3 Qc7 21.Nh4 Qg3 22.Bg4 Qg4 23.Nf5 Bg5+–) 20...Ne5 21.Be5 Qe8 (21...d4 22.Qd3 Be3 23.Rf2 Bd5+–) 22.Qc3 Qg6 23.Qd4 (better 23.b5!? Kd7+–) 23...Rg8 24.Nf3 Qh5 (24...Qg4+–) 25.Nh4 (better 25.Qd3 Qf7 26.Nd4+–) 25...Qe2 26.Bf4 (26.Rae1!? Qc2+–) 26...Bg7 27.Qd1 Qb5 (27...Qa6 28.Ng6 Bf6 29.Ne5+–) 28.Rb1 Bf6 29.Qc2 Bh4 (29...d4 30.ed4 Bd4 31.Kh1+–) 30.gh4 a5 (30...Kd7 31.h5 Rg4 32.h6+–) 31.a4 (31.ba5 Qa5 32.Qb2 Kd8 33.Qb7 Ke8 34.Qc6 Kf7+–) 31...Qa6 (31...Qc4 32.Qc4 dc4 33.ba5+–) 32.b5 cb5 33.ab5 Qa8 (33...Qa7 34.h5 Rg4 35.Qc3+–) 34.c6 b6 (34...Kd8+–) 35.Qc3 Bf7 36.Qe5 Qa7 37.c7 Qb7 38.Qf5 e6 39.Qf7 Rg4 (39...Rg2 40.Kh1 Rg1 41.Kg1 Qa8 42.Qe8 Kb7 43.Qb8 Qb8 44.cb8Q) 40.Qe6 1–0. Bendega (1905) – teliham (1835), lichess.org, 2020.

4.Nf3 d4? 5.Bd4+/– Bd5 6.Be5 Qe6 (6...Qd7!?+/–) 7.Bc7+– g6 8.e3 Bc6 (8...Nc6 9.Nc3 Bf3 10.Qf3+–) 9.b5 Bd7 10.Ne5 Bg7 (10...Nh6+–) 11.Bc4 (11.Nd7?! Qd7 12.Bb8 Ba1+=) 11...Qd5 (11...Qc4 12.Nc4 Ba1+–) 12.Bd5 Be5 13.Be5 (13.Be5 f6 14.Bb7 fe5 15.Nc3+–) 1–0. Janek – Quincy, internet, 2016.

4.Nf3 Bg4!? =.

3.a3 Qf4

4.e3 Qg5 5.Nc3 e6 6.Nb5 Qe7 7.Nf3 (7.Be5 Na6+=) 7...a6= 8.Nc3 Nf6 9.Be2 Nc6 10.0–0 Ne4 11.Ne4 de4 12.Nd4 Nd4 13.Bd4 Bd7 14.Bc5 Qd8 (14...Qg5 15.Bf8 Rf8 16.f4 ef3 17.Rf3=) 15.Bf8+= Rf8 16.d3 Ba4 17.de4 Qd1 18.Bd1 0–0–0 19.c3 Bb5 20.Re1 Rd3 21.Rc1 Rfd8 22.Be2 Rd2 23.Bb5 ab5 24.Kf1 Ra2 25.Red1 Rd1 26.Rd1 Ra3 27.Rc1 c6 28.f3 Kd7 29.Kf2 Ke7 30.Kg3 b6 31.f4 c5 32.bc5 (32.e5 Kd7=) 32...bc5=+ 33.e5 b4 (33...Kd7 34.Kf2=+) 34.Kf3 (better 34.cb4!? cb4 35.Rc7 Ke8 36.Kf3=) 34...bc3 35.Ke4 f6 36.ef6 gf6 37.Kd3 Kd6 38.Rc3 (38.Rc2!?–/+) 38...Rc3–+ 39.Kc3 Kd5 40.g4 (better 40.f5 ef5 41.Kd3–+) 40...Ke4 41.Kc4 (41.Kd2–+) 41...Ke3 42.Kc5 (42.f5 ef5 43.gf5 Kf4 44.Kc5 Kf5–+) 42...Kf4 43.h3 e5 44.Kd5 e4 45.h4 e3 46.g5 fg5 47.hg5 e2 (47...e2 48.Kd6 Kg5 49.Kd5 h5 50.Kc5 h4 51.Kb6 h3 52.Kb5 h2 53.Ka5 e1Q 54.Kb5 h1Q 55.Kb6 Qb4 56.Kc7 Qhb7 57.Kd8 Q4e7) 0–1. Atotheking – Leonard7, lichess.org, 2019.

4.e3 Qg5 5.Nf3 e5?? (better is 5...Qh5+=) 6.Ng5+– (6…f6 7.Nf3+–) 1–0. kamret (2225) – Bigjohn61, GameColony.com, 2003.

3.a3 f6

4.Nc3+= g5? 5.e4+– Bg7 6.Qh5 Kd8 7.Qf7 de4?? 8.Qg7 Bf5 9.Qh8 Be6 10.Qh7 e3 11.de3 Nc6 12.Ne4 Qd5 13.Rd1 Nd4 14.Rd4 (14.Rd4 Ke8 15.Rd5 Bd5 16.Be2+–) 1–0. pierre – george_pe, internet, 2009.

4.e3 c6 5.b5 (5.d4 Bf5+=) 5...e5 6.a4 Be6 7.a5 (7.d4 Ne7=) 7...a6 (7...Qd7 8.d4 ed4 9.Bd4=+) 8.b6 (8.Ba3 c5=) 8...Qd7 (8...Nd7 9.Nf3=+) 9.g3 (9.d4 ed4 10.ed4 Be7=) 9...Nh6 10.Bg2 Bd6 11.f3 Nf7 12.d3 0–0 (12...Qe7 13.Ne2=+) 13.Nd2 c5 14.Qe2 (14.f4 d4=+) 14...Nc6 (14...Qb5 15.Bc1 Nc6 16.c4–/+) 15.c3 Rad8 16.d4 (16.f4!?–/+) 16...ed4 17.cd4 cd4 18.ed4 Rfe8 (better 18...Bb4–+) 19.Qd3?? (better 19.Kf2–+) 19...Bf5 20.Ne4 de4 21.fe4 Nb4 22.Qb1 (22.Qe2 Ng5 23.Qc4 Kh8–+) 22...Rc8 (better 22...Re4! 23.Be4 Re8 24.Nf3 Be4 25.0–0 Bb1 26.Rab1–+) 23.Ne2 Nc2 24.Kf2 Be4 25.Be4 Re4 26.Nc3 (26.Rc1 Qf5 27.Nf4 Rf4 28.gf4 Qf4 29.Ke2 Re8 30.Kd3 Qf3 31.Kc2 Re2 32.Kd1 Qf1) 26...Qf5 27.Kg2 (27.Kg1 Rd4 28.Qf1–+) 27...Rc3! 28.Bc3 (28.Re1 Bg3! 29.Rf1 Re2 30.Kg1 Bh2 31.Kh1 Qd5 32.Rf3 Qf3) 28…Re2 The nicest combinations are those leading to mate (28...Re2 29.Kg1 Qf2) 0–1. Delboy Smith (1705) – Hermitcrab (2340), ChessWorld.net, 2018.

3.Ba3 b5

4.e3 a6 5.f4 Nd7 (5...Nc6 6.c3=+) 6.Nf3 e5 7.fe5 Ne5 8.Be2 Be7 9.Bb2 Bf6 (9...Nf3 10.Bf3 Nf6 11.0–0=+) 10.Be5 Be5 11.Ne5 Qe5 12.c3 (12.Nc3 Rb8=) 12...Nf6 (12...Bd7 13.Na3=) 13.0–0 (13.a4 Qg5 14.g3 Rb8=) 13...0–0 (13...Bd7 14.Na3=) 14.Na3 Re8 15.Nc2 Ne4 16.Nd4 Bd7 17.Qc2 Rac8 18.Bd3 f5 (18...Qg5 19.Be4 de4 20.Nb3=) 19.Nb3 Re6 20.Rf3 Rh6 21.g3 Ng5 (21...Rf8 22.Rf4=) 22.Rff1 Rf8 (22...Ne4 23.Rf4=) 23.Nd4 Now all is on f5 (23.Nc5 Bc8+=) 23...Ne4= 24.Be4 (24.Rf4 g5 25.Rf3 Be8=) 24...de4 25.c4 (25.Rf4 Rd6=) 25...c5 26.bc5 Qc5 27.cb5 (27.Rfc1 bc4 28.Qc4 Qc4 29.Rc4 Rb6=+) 27...Qc2–/+ 28.Nc2 Bb5 29.Rfc1 ½–½. Schiffler,Leonhard – Steltzner,Harald, Bad Lausick, 1951.

4.e3 a6 5.g3 e5 6.d3 Nf6 7.Bg2 Nc6 Now all is on b4 8.c3 Be7 9.Ne2 h5 (9...0–0 10.0–0–/+) 10.c4 (10.Bb2 h4=+) 10...dc4 11.dc4 Qd1 12.Kd1 Bb7 (12...Bd7 13.c5–/+) 13.c5 (13.cb5!? 0–0–0 14.Kc2 ab5 15.Nbc3–/+) 13...0–0–0 14.Kc1 (14.Ke1!? Nd5 15.Bd5 Rd5–+) 14...Ng4 15.Bh3? (15.Rf1 Nh2 16.Rd1 Ng4–+) 15...Kb8 (15...Nb4!? 16.Rf1 Nd3 17.Kc2–+) 16.Bg4 (16.Rf1 Nh2 17.Rh1 Nd4 18.Rh2 Ne2 19.Kc2 h4–+) 16...hg4 17.e4 (17.Rd1 Rd1 18.Kd1 Rh2–+) 17...Bg5 (better 17...a5 18.ba5 b4 19.Bb2–+) 18.Kc2 (18.Kb2 a5 19.Kb3 Rd3 20.Kc2 Nb4 21.Bb4 Be4 22.Nbc3 Rd2 23.Kb3 Bh1 24.Rh1 ab4 25.Kb4–+) 18...Nd4 19.Nd4 Be4 20.Kb3 (20.Kb2 Bh1 21.Nc2 Rh2–+) 20...Bh1 21.Ne2 (21.Nc2 Rd3 22.Nc3 Bd2 23.Rh1 Bc3–+) 21...Rd3 22.Nec3 Rh2 23.Bb2 Bd5 24.Ka3 Rf2 (24...Rf2 25.c6 a5 26.Nd2 Rfd2 27.Rc1 Be7 28.Rd1 Bb4) 0–1. petrobbo (2130) – Coroticus (2445), ChessWorld.net, 2014.

3.b5 b6

4.a4 a5 (4...a6 5.Nf3=) 5.e3 Bf5 (5...e5 6.Ba3 Qf6 7.Bf8 Kf8 8.d4=) 6.Nf3+= f6 (6...Nd7 7.Nh4 Be4 8.d3+=) 7.Nd4 g6 (7...Bg6 8.Qg4 Nd7 9.Qe6+=) 8.Be2 (better is 8.Nf5 gf5 9.c4+/–) 8...Qb4?? (better is 8...Bc8+/–) 9.Nf5 (better is 9.Ba3 Qa4 10.Nc3 (10.Nf5?! gf5 11.d4 e6 12.Bf8 Qa1+–) 10...Bc2 11.Qc1 Qd4 12.ed4+–) 9...Qb2=+ 10.Nc3 Qb4?? (better is 10...gf5 11.Ra2 Qb4 12.Nd5 Qc5 13.Bh5 Kd8–/+) 11.Nd5+– Qh4?? (11...Qc5 12.Nd4 Ra7+– (< 12...Qd5 13.Bf3 Qd6 14.Ba8+–)) 12.Nc7 (better is 12.Nh4 Ra7+–) 12...Kf7 (12...Kd7 13.Nh4 Kc7+–) 13.Nh4 Ra7 14.Bc4 Kg7 15.Ne8 Kh6 16.g3 (16.Nf5 Kg5 17.h4 Kf5 18.Qf3 Ke5 19.d4) 16...g5 17.Nf5 (17.Qh5 Kh5 18.Bf7 Kh6 19.Nf5) 17...Kg6 18.Bd3 (18.Qg4 h5 19.Qe4 h4 20.Ne7 Kh5 21.Bf7 Kh6 22.Qg6) 18...Nc6 19.Nfd6 (19.Nfg7 f5 20.Qh5) 19...f5 20.Bf5 Kh6 21.h4 (21.Nf7) 21...ed6 (21...e5 22.hg5 Kg5 23.Qg4) 22.hg5 Kg5 23.Qg4# 1–0. Scirocco – Rockthejam, Live Game Caissa's Web, 2004.

4.e3 e5 5.Nf3 f6 6.d3 (6.d4 e4 7.Nfd2 Ne7+=) 6...Nd7 7.Be2 d4 (7...a6 8.a4=) 8.0–0 (better 8.Ba3!? c5 9.bc6+–) 8...de3= 9.fe3 Ne7 (9...Qb4 10.Ba3 Qb5 11.d4=) 10.Nbd2 Nc5 11.a4 a6 12.Ba3 (12.d4 ed4 13.ed4 Ne6+–) 12...ab5 (12...Nd5 13.d4 Ne3 14.dc5+=) 13.ab5 (13.d4 ed4 14.ed4 b4 15.Bb4 Qf4+–) 13...Bd7 (13...Nd5!? 14.Nc4 Qd7+=) 14.d4 ed4 15.ed4 Nd5? (15...Qf4 16.Nc4 A) 16...Bb5?? A1) 17.dc5 Bc4 18.Bc4 Qc4 19.cb6 Rd8= (19...cb6 20.Be7 Qc8 21.Ra8 Qa8 22.Bf8 Rf8 23.Qe2 Kf7 24.Qc4 Kg6 25.Nh4 Kh5 26.Nf5+–); A2) 17.Nfe5 Qf1 18.Qf1 fe5 19.dc5+–; B) 16...Be6+–) 16.dc5 bc5 (16...Qe6 17.Bc4 Ra3 18.Ra3 Bc5 19.Nd4 Bd4 20.Kh1+–) 17.Nc4 Qe6 18.Re1 Qf7 (18...Kd8 19.Qd2 Nb6 20.Rad1+–) 19.Nb2 (better 19.Ng5! Ne3 20.Nf7 Nd1 21.Bh5 Be7 22.Nh8 Kf8 23.Re7 Ke7 24.Bc5 Ke6 25.Ra8 Nc3+–) 19...Be7 20.Bc4 c6 (20...Be6 21.Bd5 Bd5 22.Bc5 Ra1 23.Qa1+–) 21.Bc5 cb5 (21...Ra1 22.Qa1 0–0 23.Re7 Ne7 24.Bf7 Kf7+–) 22.Re7 (22.Ra8 Bc8 23.Bb5 Kf8 24.Rc8 Qe8 25.Qd5 Bc5 26.Qc5 Kf7 27.Be8 Re8 28.Qh5 g6 29.Qh7 Kf8 30.Rce8) 22...Ne7 23.Bf7 (23.Ra8 Nc8 24.Qe2 Qe6 25.Qe6 Be6 26.Be6 b4 27.Rc8) 23...Kf7+– 24.Qd7 (better 24.Ra8 Ra8 25.Qd7 Kg8+–) 24...Rad8 (24...Ra1 25.Kf2 Re8+–) 25.Qe7 (25.Qe7 Kg6 26.Qe4 Kh6 27.Qf4 Kg6 28.Ne5 fe5 29.Qg4 Kf7 30.Qf5 Ke8 31.Qe6; 25.Ne5 fe5 26.Rf1 Kg6 27.Qg4 Kh6 28.Be3 g5 29.Qg5) 1–0. avz81 (1650) – fab72 (1680), lichess.org, 2018.

3.b5 Bf5

4.Na3 e5=+ 5.Nf3 f6 (5...Nd7 6.e3=+) 6.e3 Nd7 7.Nb1 c5 8.Nh4 Be6 9.Be2 Ne7 10.d3 d4 11.ed4 (11.0–0 a6 12.ba6 ba6=+) 11...ed4 (11...cd4 12.Qd2–/+) 12.c3=+ a6 (12...Qf4 13.Nf3 dc3 14.Nc3=) 13.a4 (13.cd4 Qb6=) 13...g6 (13...ab5 14.ab5 Ra1 15.Ba1 dc3 16.Nc3=) 14.cd4 cd4 15.Nd2 (15.Nf3 Qb4 16.Qd2 Nf5=) 15...Nc5 (15...Nd5!?=) 16.Nhf3+= The isolani on d4 becomes a target 16...Bh6 (16...Nf5 17.0–0+=) 17.Nd4+– (worse 17.Bd4 Bd2 18.Qd2 Nb3=+) 17...Qe5 (17...0–0!?+–) 18.0–0+– (worse 18.Ne6 Nd3 19.Kf1 Nb2=+) 18...Rd8 (18...Bd5 19.Nc4 Bc4 20.dc4+–) 19.N2f3 Qd5 20.Ne6 Qe6 21.Nd4 (21.Re1 a5+–) 21...Qe5 (21...Qd6 22.Re1+–) 22.Nb3 Qb2 23.Nc5 ab5 24.Rb1 Qd4 25.Rb5 Ra8 (25...Rc8 26.Nb7 0–0 27.Qb3 Kh8 28.a5+–) 26.a5 (26.Qa1 Nf5 27.Bf3 Qa1 28.Ra1 Nd4 29.Re1 Kd8 30.Nb7 Kc8 31.Rc5 Kb8+–) 26...Nc6 (26...Bf4 27.Bf3+–) 27.Nb7 (better 27.Bf3 Ne5 28.Bb7+–) 27...Qc3? (27...0–0+–) 28.Rc5 (28.Bf3 Nd4 29.Nd6 Ke7 30.Re1 Kd7 31.Ba8 Nb5 32.Nb5 Qb4+–) 28...Qb4 29.Nd6 (better 29.Rc6 Qb7 30.Bf3+–) 29...Ke7 (29...Kd7 30.Rc6 Kc6+–) 30.Rc6 Ra5 31.Qc2 (better 31.Bg4 f5 32.Nc4 Ra2+–) 31...Bf4 (31...Rb8 32.Bf3 Bf4 33.Qe2 Be5 34.Nc4+–) 32.Nc8 (32.Rb1 Qd6 33.Rd6 Kd6+–) 32...Kf7 (32...Kf8 33.Rd1 Kg7 34.d4+–) 33.Rc4 (33.Rb1!? Qb1 34.Qb1 Rf8+–) 33...Qb8 (33...Qb7 34.Rb1 Qd7 35.g3+–) 34.g3 Rg5 (34...Be5 35.d4 Bd4 36.Rc7 Kf8 37.Qc6 Qc7 38.Qc7 Ba1 39.Qe7 Kg8 40.Bc4 Rd5 41.Bd5) 35.Rb1 (35.Rb1 Qa8 36.Rc7 Bc7 37.Qc7 Kg8 38.Nd6 Qf8 39.Rb8 Rg3 40.fg3 Qb8 41.Qf7) 1–0. petrobbo (1990) – jonmt (2005), ChessWorld.net, 2010.

4.e3 Nd7 5.Nf3 e5 6.Be2 Ngf6 7.0–0 h6 8.c4 c6 9.a4 Be7 10.d4 e4 11.bc6 bc6 12.Ne5 Qe6 13.cd5 cd5 (13...Qd5? 14.Bc4 Qd6 15.Nf7+–; 13...Nd5?! 14.Nd7 Qd7 15.Ba3=) 14.Bb5 0–0 15.Nd7 Nd7 16.Nc3 Rfc8 17.Qb3 Nb6 18.Rfc1 Rab8 19.Qa2 Bd6 20.Ba3 Ba3 21.Qa3 Nc4 22.Bc4 Rc4 23.Nb5 Qa6 24.Rc4 dc4 25.Qc5 Be6 26.Qa7 (< 26.Na7 Qa4 27.Rf1 Bd7–/+) 26...Qa7 27.Na7 Ra8 (27...Ra8 28.Nb5 Kf8+–). Conti,Ferdinando – Stella,L (1940), Open, Brescia ITA, 2009.

4.Nf3= Nd7 5.e3 e5 6.d4 e4 7.Ba3 Qe6 (7...Qf6 8.Bf8 ef3 9.Bb4=) 8.Bf8= Nf8 9.Nfd2 Bg4 10.Be2 Nf6 11.Bg4 Ng4 12.c4 0–0–0 (12...dc4!? 13.Nc3 f5=) 13.cd5 Rd5 14.Nc3 Rd8 (14...Rh5!?+/–) 15.Nde4 f5 (15...Nd7 16.Rc1+/–) 16.Nc5+– Qc4 17.Rc1 b6 (17...Ne5 18.Qc2 g6 19.a3+– (19.de5?! Qc5 20.0–0 Ne6+=)) 18.Nd3 Nd7 19.0–0 h5 (19...Kb8+–) 20.Ne4! Qd5 (20...fe4 21.Rc4) 21.Qc2 c5 22.dc5 bc5 (22...Kb8 23.cb6 Ka8+–) 23.Nec5 Nb6 (23...Nc5 24.Nc5 (24.Qc5?! Qc5 25.Rc5 Kb7+–) 24...Qf7 25.Na6 Kd7 26.Rfd1 Ke7 27.Qc7 Kf6 28.Rc6 (28.Rd8?! Qc7 29.Rf8 Rf8 30.Nc7 Rd8+–) 28...Qe6 29.Re6 Ke6 30.Nc5 Kf6 31.Qc6 Rd6 32.Rd6 Kf7 33.Qd5 Kf8 34.Rd7 Nf2 35.Qf7#) 24.Nb4 Qf7 (24...Qd2 25.Qf5 Kb8+–) 25.Ne6 Nc4 26.Qc4 Kb8 27.Na6 Ka8 28.Qc6 Qb7 29.Nec7# 1–0. kamret (2180) – H_town (2280), GameColony.com, 2003.

3.e3 e5

4.b5 Nf6 5.Nf3 Nbd7 6.a4 g6 7.Ba3 Qe6 8.Be2 Bg7 9.c4 c5 10.bc6 bc6 11.0–0 Rb8 12.Ng5 Qf5 13.cd5 (13.Nh3 e4=) 13...Qg5=+ 14.dc6 The passed pawn on c6 will quickly become a dangerous weapon 14...Nb6 15.Bb5 Kd8?? (15...Nbd5 16.Bd6 Bh3 17.c7 Rb5 18.c8Q Bc8 19.ab5 Bh3–/+) 16.Bd6+– Threatening mate: c7 16...Nfd5 17.Bb8 Bh3 (17...a6 18.a5 ab5 19.ab6 Nb6+–) 18.Qf3 Be6 (18...e4 19.Qh3 Ba1 20.a5+–) 19.e4 Nf4 20.c7 Ke7 21.Ba7 (21.Ba7 Na8 22.Bc5 Kf6 23.d4+–) 1–0. onur604 (2320) – Malcolm_Tucker (2140), lichess.org, 2020.

4.Nc3 c6 5.f4? (better is 5.a3!?=) 5...ef4–+ 6.ef4 (6.a3–+) 6...Nf6 (6...Qb4 7.Rb1 Qf4 8.Nf3–+) 7.Qe2 (7.Nce2 Qb4 8.Bf6 gf6–/+) 7...Qe6 (7...Be7!?–/+) 8.a3 Bd6 9.g3 h5 (9...0–0 10.Nd1=+) 10.Nf3= Qe2 11.Be2 Bg4 12.Nd4 Nbd7 13.h3 Be2 14.Nce2 0–0–0 15.d3 Nb6 16.Kd2 Na4= 17.Rab1 Nb2 18.Rb2 g6 19.Rhb1 Rhe8 20.b5 c5=+ 21.b6 a6 22.Nf3 Re7 23.Ra2 Bb8 24.Rg1 Rde8 Black fights for the Initiative 25.Rg2 d4 26.c3 Re3 27.Ng5 dc3–/+ 28.Nc3 Rg3! 29.Rg3 Bf4 30.Kd1 Bg3 31.Nf7 Re1 32.Kd2 Rh1 33.Rc2 Be1 34.Ke2–/+ Bc3 35.Rc3 Nd7 36.d4 Nb6 37.Rc5 Kd7 38.Ne5 Kd6 39.Ng6 Rh3 40.Nf4 Ra3 41.Rh5 Nc4 42.Rh6 Kd7 43.Nd3 b6 44.Rg6 a5–+ 45.Ne5 Ne5 46.de5 Rb3 47.Kd2 a4 48.Kc2 b5 49.Ra6 Re3 50.Rd6 Kc7 (51.Ra6 Re5–+) 0–1. Padoan – Monti, Torino, 1962.

3.a3 a5

4.b5 Qb6 5.e3= c6 (5...Nf6 6.Nf3+=) 6.Nf3 Bg4 (6...Nd7 7.Nc3+=) 7.Nc3+– g5?? (better 7...Nf6+–) 8.Na4+– Qc7 9.Bh8 f6 (9...Nd7 10.Be2+–) 10.bc6 bc6 11.Be2 (11.h3 Bh5 12.c4 Nh6+–) 11...Nd7 (11...Nh6 12.h4 gh4 13.Nd4 Be2 14.Qe2+–) 12.Nd4 (better 12.h4 gh4 13.Nd4 Be2 14.Qe2+–) 12...0–0–0 (12...Be2 13.Qe2 Nh6 14.Qh5 Nf7+–) 13.Bg4 e5 14.Ne6 Qa7 15.Nd8 Kd8 16.Be6 (16.h4 h6+–) 16...Nh6 17.Qh5 (17.Bd7 Kd7 18.Bf6 Ke6 19.Bg5 Nf5+–) 17...Kc7 18.Qe8 (18.Qe8 Kd6 19.Bd7+–) 1–0. GuestCKBV – GuestXSLL, freechess.org, 2019.

4.b5 Bd7 5.e3 c6 6.a4 (6.Nc3 e5=) 6...cb5 7.ab5 e5 (7...a4 8.Nf3=) 8.Ba3 (8.Qh5 e4+=) 8...Qb6 (8...Qf6 9.Bf8 Kf8 10.Qf3=) 9.Bf8 Kf8 10.Na3 (10.Nf3 Bg4=) 10...Nf6 (10...Ne7 11.d4 ed4 12.ed4=) 11.c3 (11.Nf3 Bg4=) 11...Qc5 (11...Bf5 12.d4 Nbd7 13.de5 Ne5 14.Qd4 Qd4 15.cd4=) 12.Qb3 (12.Be2 e4=) 12...b6 (12...a4 13.Qc2=) 13.Nf3= Ng4 (13...a4 14.Qc2 Qc7 15.c4=) 14.h3 (better is 14.d4 Qc7 15.Nb1= (< 15.Qd5 Qc3 16.Ke2 Qa1 17.Qa8 Ke7–/+)) 14...e4 (14...a4 15.Qc2 e4 16.hg4 ef3 17.Rh7 Rh7 18.Qh7 fg2 19.Bg2 Bb5 20.Qh8 Ke7 21.Nb5 Qb5 22.Qg7 Nd7+–) 15.hg4+/– ef3 16.gf3 Be6 (16...Ke8 17.Qa4+/–) 17.Nc2 (17.Qc2 Kg8+/–) 17...Nd7 (17...d4 18.c4 de3 19.fe3+–) 18.Qa3 (18.d4 Qc7+/–) 18...Rc8 (18...Qa3 19.Ra3 Ne5 20.Nd4+/–) 19.Nd4+/– Ne5 (19...Qa3 20.Ra3 Ne5 21.d3+/–) 20.Be2 (20.Qc5 Rc5 21.Rh5 Nf3 22.Nf3 Bg4=) 20...Bd7 (20...Qa3 21.Ra3 Nc4 22.Ra4+/–) 21.Rh5 f6 22.Qb3 g6 23.Rh4+– Nc4 24.Bc4 Qc4 25.Qc4 Rc4 26.e4 de4 27.fe4 The passed pawn on d2 will quickly become a dangerous weapon 27...g5 28.Rh1 Bg4 29.f3 Bd7 30.Kf2 Kf7 31.Ra3 h5 32.d3 Rc5 33.c4 Kg6 34.Ne2 f5 35.Nc3 fe4 36.Ne4=+ Rf5 37.Kg2 Rhf8=+ 38.d4 Rf4 39.Re1 g4 40.Rg1? gf3 41.Kf2 Bg4 42.Re3 Rd8 43.Kg3? Rf5 44.d5 Re8 45.Rge1 Rfe5 46.Kf4 Bf5?? 47.Rg1= Kh6 48.Nd6+/– Bh3? 49.Re5 f2 50.Nf7 (50...Kh7 51.Rh5#) 1–0. Larios,Francisco Javier – Garcia Andres,Daniel, Aragon–ch Preferente, 2002.

4.b5 Bf5 5.e3 (5.Nf3 Nf6=) 5...Nd7 (5...e5 6.Nf3 Nd7 7.d4=+) 6.Nf3 (6.Bd3 Bd3 7.cd3 Qg6=+) 6...e5 7.Be2 (7.d4 e4 8.Ne5 Ngf6=+) 7...Be7 8.0–0 Nh6 (8...Ngf6 9.d4 e4 10.Ne5=+) 9.d3 (9.d4 e4 10.Ne5 0–0=) 9...0–0=+ 10.c4 dc4 11.dc4 Rfd8 12.Nc3 (12.Qd5 e4 13.Nd4 Qd5 14.cd5 Bd6=) 12...Nc5 (12...Qg6 13.Nd5 Qd6 14.Ne7 Qe7 15.Qd5+=) 13.Nd5 (13.Qd6 Bd6 (< 13...cd6 14.Nd5 Re8 15.Rad1+=) 14.Rad1 Bc2=) 13...f6 (13...Bf6 14.Qd2=) 14.Ne7 Qe7 15.Qe1 Qe6 (15...Nd3 16.Qc3=) 16.Qc3 (16.Rd1 Nd3 17.Qc3 Nb2 18.Qb2 c5=) 16...Nf7 (16...Na4 17.Qb3 Nb2 18.Qb2=) 17.Rad1= Nd6 18.Nh4 (18.Rd2 Nce4 19.Qc1 Nd2 20.Nd2 c5–+) 18...Na4=+ 19.Qc1 Nb2 20.Qb2 Bg4 21.f3 Nf5 22.fg4+= Nh4 23.c5 Kh8 24.g3 Ng6= 25.Qc3 b6 26.cb6 cb6 27.Rd8 Rd8 28.Qc6 Qc6 29.bc6+= Rc8 30.Bf3 h5? 31.Rc1 hg4+/– 32.Be4 Nf8 33.c7?? Ne6=+ 34.Rc6 Nc7? 35.Bf5+– Rd8 36.Rc7 g6 37.Bg6 Rd1 38.Kf2 Rd2 39.Kf1 Rh2 40.a4 Rh1 41.Kg2 Ra1 42.Rc4 Ra3 43.Kf2 Ra2 44.Ke1 Kg7 45.Rg4 Kf8 46.Bf5 Ke7 47.Rh4 Kd6 48.Rh6 Ke7 49.Rh7 Kf8 50.Rh6?? Ke7+/– 51.Rh7 Kf8+– 52.Bd7 Rg2 53.g4 Kg8 54.Re7 Kf8 55.Re6 Rg4 56.Rf6 Ke7 57.Rf7 Kf7 58.Bg4 Ke7 59.Kd2 Kd6 60.Kd3 Kc5 61.Ke4 Kd6 62.Bf5 b5 63.ab5 a4 64.b6 a3 65.b7 Kc7 66.b8Q Kb8 67.Be6 Kb7 68.Ke5 Kc7 69.e4 Kc6 70.Bb3 Kc5 71.Bd5 Kb4 72.Kd6 (72...a2 73.Ba2+–) 1–0. Nemec,Zdenek (2045) – Werner,Peter, TE–2004–P–01711, 2004.

4.b5 Nf6 5.e3 e5 6.Nf3 Nbd7 7.Be2 Be7+= 8.0–0 e4 (8...0–0 9.d3+=) 9.Nd4= Nc5 10.c4 0–0 11.Nc3 dc4 12.Bc4 Ng4 13.g3? (better is 13.f4=) 13...Qh6–+ 14.h4 Bh4! 15.gh4?? (15.Qe2 Ne5 16.Nd5–+ (16.gh4?? Bh3 17.f3 Nc4–+)) 15…Qh4 (15...Qh4 16.Qg4 Bg4–+) 0–1, Neumann,Frank – Astroukh,Vitalij (1945), OP–2012–0–02352, 2012.

4.b5 h5 5.e3 Bg4 6.Nf3 Nd7 7.c4 c6 8.h3 Bf3 9.gf3 Ngf6?! 10.bc6 bc6 11.cd5 cd5 12.Bb5 Kd8?! 13.Nc3 Nb6 14.Na4 Nfd7 15.Qb3 Na4 16.Qa4 Nb6 17.Qd4 e5? 18.Qe5 Qe5 19.Be5 Nd7 20.Bd4 Rc8 21.Bc3 Rc3 22.dc3 Nb6 23.Ke2 Kc7 24.c4 dc4 25.Bc4 f6 26.Bf7 Bd6 27.Rhg1 g5 28.Rgc1 Kb7 29.Rd1 Be5 30.Rab1 Ka6 31.Rdc1 h4 32.Rc6 Rb8 33.Bc4 Ka7 34.Bd3 1–0. Heinola – Pietinen, 1984.

4.c3 ab4 5.cb4 e5 6.g3 f6 7.e3 c6 8.Nf3 Be6 9.Nh4 Nh6 10.Bg2 Be7 11.Bf3 0–0 12.Bh5 Bf7 13.Be2 Nd7 14.Bf1 Rfe8 15.Bd3 Nf8 16.Nc3 e4 17.Be2 Ng6 18.Ng2 Ne5 19.Nf4 Rad8 20.Na4 g5 21.Nh3 Be6 22.Ng1 Bc8 23.Nc5 Kg7 24.Bf1 Bg4 25.Qb3 (25.Nb7? Qd7 26.Qc2 Qb7–+) 25...b6?? (better 25...Rb8=+) 26.Nb7+– Qe6 27.Nd8 Rd8 28.Be5 Qe5 29.Be2?? (better 29.Rb1+–) 29...Qa1–+ 30.Qd1 Qd1 31.Bd1 (31.Kd1 Ra8 32.b5 cb5–+) 31...Bd1 32.Kd1 c5 (better 32...Ra8!? 33.b5 cb5 34.h4–+) 33.bc5 Bc5 34.Ke2 Ba3 35.Nh3 Bc5 36.Rb1 (36.d4 ed3! 37.Kd3 d4 38.ed4 Rd4 39.Kc3 Ra4–+) 36...Ra8 37.d3 (37.d4 ed3! 38.Kd3 Ng4–+) 37...Ra2 38.Ke1 ed3 39.Ng1 (39.Rd1–+) 39...Ng4 40.f3 Ne3 41.f4 (41.g4 d2 42.Kf2 d1Q 43.Rb2 Rb2 44.Kg3 Qg1 45.Kh3 Qh2) 41...d2 42.Kf2 d1Q 43.Ne2 Qb1 (43...Qe2 44.Kg1 Qh2) 44.Kf3 (44.g4 Qf1 45.Kg3 Qg2) 44...Re2! 45.Ke2 (45.Ke2 Qc2 Mate attack) 45...Qe4 (45...Qc2 46.Ke1 Bb4) 46.fg5 (46.Ke1 Qd3 47.fg5 Nc2) 46...fg5 (46...Qg2 47.Kd3 Qc2) 47.h3 (47.Ke1 Qc2 48.h3 Bb4) 47...Ng4 (47...Qc2 48.Ke1 Bb4) 48.Kd2 Qe3 49.Kc2 (49.Kc2 Qe2 50.Kb3 Ne3 51.Kc3 Qc2). alessandrocarvalhaes (1865) – billybrig (1830), lichess.org, 2019.

4.Nc3 ab4 5.ab4 Ra1 6.Qa1 c6 7.Nd1 Nf6 8.Be5 Qb4 9.Bb8 Nd7 10.Bc7 e6 11.Qa8 Nb6 12.Bb6 1–0. marus1 – forkwell, internet, 2001.

4.Nc3 Bf5 5.Nb5 Qd7 (5...Qb6 6.e3 Nd7 7.Qf3+–) 6.e3 Nc6 7.Nf3 e6 (7...Nf6 8.Ne5 Qc8 9.Bd3 Bd3 10.Nd3+=) 8.Ne5+– Ne5 9.Be5 Bd6?? (better 9...Rc8+–) 10.Bg7+– 1–0. ilbepi (2195) – kingsrook3 (1985), gameknot.com, 2017.

4.Nc3 Nf6 5.e3 e5 6.Nf3 c6 7.Be2 (7.ba5 Nbd7=) 7...ab4 8.ab4 Ra1 9.Qa1 e4 10.Nd4 Qb4 11.0–0 Be7 12.Rb1 Qd6 13.Qa7 0–0 14.Na4 Qc7 15.Bc3 Attacks the backward pawn on b7 (15.h3 Bd6=) 15...Bd6 16.h3 Bh2 17.Kh1 b5 18.Qc7 Bc7 19.Nc5 Bb6 (19...Nbd7 20.Bb4 Ne5 21.f4 ef3 22.gf3=) 20.Bb4 Re8 21.Ra1 Nbd7 (21...Re7 22.Ncb3 Ra7 23.Ra7 Ba7 24.Bd6=) 22.Nd7 Bd7 23.Ra6 Bd4 24.ed4 h5 25.Bd6 Kh7 26.Kh2 Kg6 27.Kg3 h4 28.Kf4 Nh7 29.Ra7 Bf5 30.Be7 Nf6 31.c3 Be6 32.Rc7 Rc8 33.Ra7 Rb8 ½–½. ilbepi (2195) – qphys8 (1950), gameknot.com, 2017.

4.c4 c6 5.c5 Qc7 (--> 1.b4 c6 2.Bb2 Qb6 3.a3 a5 4.c4 d5 5.c5 Qc7).

4.d4 ab4 5.ab4 Ra1 (5...Qb4?? 6.c3 Ra1 7.cb4+–) 6.Ba1 Nf6 7.c3 b6 8.e3 Ba6 (better is 8...Bf5=) 9.Ba6+/– Na6 10.Nh3 (better is 10.Qa4 b5 11.Qb5 Nd7 12.Nf3+/–) 10...c6=+ 11.Na3 Nb4 12.f3 (12.Qa4!? e5 13.Ke2=) 12...Nd3 13.Qd3 Qa3 14.0–0 Qd6 (14...e6 15.e4–/+) 15.g4 (better is 15.Qa6!? e6 16.Qc8 Ke7 17.Qb7 Nd7 18.Rb1=+) 15...e6–/+ 16.Qa6 c5 17.Rb1 Nd7 18.Qc8 Ke7 19.Qb7 cd4 20.cd4 g6?? (better is 20...Qa3 21.Re1 h5–/+) 21.Rb6?? (21.Bc3 Kd8 22.Ng5+–) 21...Qa3 22.Bb2 Qe3 23.Nf2 Bg7 24.Qc7 Bd4 25.Qd6 Kf6 26.Bd4 Qd4 27.Rb7 Ne5 28.Qe7 Kg7 29.g5 Nf3 30.Kg2 Qf4 31.Qf6–/+ Qf6 32.gf6 Kf6 33.Kf3 Rd8 34.Kf4? e5–+ 35.Ke3 Rc8 36.Ng4=+ Kf5 37.Nh6 Kf6 38.Rf7= Kg5 39.Rh7 Rc3 40.Kd2 d4 41.Nf7 Kf6 42.Nd6 Rc6 43.Ne4+= Kf5 44.Ng3 Kg4 45.Rg7 Kf3 46.Ne2 Rd6 47.Rf7 Kg2 48.h4 e4? 49.Rg7 (49...Kh3 50.Re7=; better is 49.Rf4!? g5 50.hg5+/–). michael709 – chessleon, internet, 2007.

4.ba5 Ra5

5.e3 Nc6 6.Bc3 Ra8 7.Bb5 e5 (7...Qg6 8.Qf3 Qc2 9.Qd5=) 8.Nf3 f6 9.d4 (9.Bb4 Qe6 10.Bf8 Kf8=) 9...e4 10.Nfd2 Bd7 11.Be2 Nh6 12.Bb2 Na5 13.c4 Nc4 14.Nc4 dc4 15.Nd2 Ba4 16.Qc1 f5 17.Nc4 Qg6 18.0–0 Nf7 19.Rb1 (19.d5 Rd8 20.Ne5 Ne5 21.Be5 c6 22.dc6 bc6+/–) 19...Be7 20.f4 0–0 21.Ne5 Ne5 22.fe5 Rfc8 (22...c6 23.Bc3 b5 24.Bb4+=) 23.Ba1 Ra7 24.d5 b6 (24...Bd7 25.Rb3+=) 25.d6 Bg5 26.e6 Kh8 (26...Rd8 27.dc7 Rc8 28.Be5+/– (28.Rb6? Rac7 29.Qb2 Be3 30.Kh1 Bb6 31.Qb6 Rc2–+)) 27.Qc3 Ra5 (27...Bf6 28.Qc4 Ba1 29.Ra1+/–) 28.d7 (28.Rb6 Be3 29.Qe3 cb6+=) 28...Rd8 29.Rb4 Qh6 30.Kh1 (30.Ra4 Ra4 31.Rf5 Raa8+–) 30...Be7 31.Qc7 Qe3 32.Re1 Rc5 33.Qb6 (33.Bd4 Rc7 34.Be3 Bb4 35.ab4 Bd7 36.Bb6 Rc2 37.Bd8 Be6+–) 33...Qd2 34.Rg1 Rc6 35.Qd8 Bd8 36.e7 Qd7 37.ed8B Qd8 38.Ra4 h6 (38...Qc8 39.Rd1 Kg8 40.g4+/–) 39.g4 Rg6 40.Rd1 (40.gf5?! Rg1 41.Kg1 Qg5 42.Kf2 Qf4 43.Kg2 Qg5 44.Kf2 Qf4 45.Kg2 Qg5 46.Kf2=) 40...Qg5? (40...Qc8 41.Rad4 Kh7 42.a4+/–) 41.Ra8+– Kh7 42.Bc4 h5 43.Bg8 Kh6 44.Bf7 Qf4 (44...Qg4?? 45.Rh8 Kg5 46.Rg1+–) 45.g5 Kg5 46.Rg1 Kh4 47.Bg6 (47.Rg6?? Qf1 48.Rg1 Qf3 49.Rg2 Kh3 50.Bg7 Qg2) 47...Qf3 48.Rg2 Qd1 49.Rg1 Qf3 50.Rg2 Qd1 51.Rg1 Qf3 ½–½. Fritz 4 – Hiarcs 6, 20 min, 1998.

5.e3 e5 6.Nf3 Nc6 (6...e4 7.Bc3 Ra8 8.Nd4=) 7.c4 (7.Bc3 Ra8=) 7...Nf6 (7...dc4 8.Bc4 e4 9.Nd4+=) 8.Qb3 (8.d4 e4 9.Ne5 Qe6=) 8...b6 (8...d4!?+=) 9.cd5 Nd5 10.Bc4 Be6 (10...e4 11.Ng5 f5 12.Nc3+=) 11.Ng5+= Nce7 (11...Nd8 12.Nc3 Nc3 13.Ne6= (worse is 13.dc3 Bc4 14.Qc4 Qg6–/+; worse is 13.Qc3 Bc4 14.Qc4 Qg6–/+)) 12.Ne4 (better is 12.Ne6 fe6 13.Nc3+/–) 12...Qc6+= 13.d3 (worse is 13.Be5 Ne3 14.Be6 A) 14...Qe6?! A1) 15.Qe3? Re5 (15...Qe5?! 16.d4 Qe6 17.0–0+=) 16.f3 f5–+; A2) 15.Qe6 fe6 16.fe3 Re5 17.d3=; B) 14...fe6?! 15.Qe3 Qc1 16.Ke2 Qh1 17.Bc7 Qg2 18.Bb6–/+; C) 14...Ng2 15.Kf1 fe6–+ (15...Re5?! 16.Bf7 Kd8 17.Qd3 Kc8 18.Qh3 Nf5 19.Nbc3+=; 15...Qe6 16.Qe6 fe6 17.Bg3+–)) 13...b5 (13...f5 14.Ng5 Ne3 15.Be6 Qg2 16.Bf7 Kd8 17.Ne6 Kd7 18.Nd2 Qh1 19.Ke2+=) 14.Bd5 (14.Bc3 bc4 15.Qb8 Nc8 16.Ba5 cd3=) 14...Bd5 (14...Nd5!? 15.Be5 Ne3+=) 15.Qc3= Ra4 16.Qc6 Nc6 (16...Bc6 17.Be5 Be4 18.de4 Re4 19.Bd4= (worse is 19.Bc7 Rc4 20.Kd2 Rc7–/+)) 17.Nbc3 Be4 18.Ne4 (18.Na4 Bd3 19.Nc3 Na5=) 18...Bd6 19.0–0 0–0 (19...f6 20.f4=) 20.Rac1 Ne7 (20...Ra6!?=) 21.Nd6+= cd6 22.Rc7 Ng6 (22...Nd5!? 23.Rd7 Ra6+=) 23.Rb7+/– Ra5 24.Rc1 h6 25.Rc6 Rd8 26.Rcb6 d5 27.Rb5 Rb5 28.Rb5 f6 29.d4 e4 30.Bc3 Rc8 31.Rc5 Rc5 (31...Rb8 32.f3+–) 32.dc5+– Kf7 33.Kf1 (33.a4!? Ke6+–) 33...Ke7+/– 34.g3 (34.a4!?+/–) 34...Kd7+= 35.Ke2 (35.Bd4 Kc6+=) 35...Kc6= 36.Bb4 Ne5 37.h3 g6 38.g4 Nd3 Attacking the isolated pawn on c5 39.f4 Nc5 40.Bc5 (40.f5!? gf5 41.gf5=) 40...Kc5+= 41.Kd2 d4 (better is 41...Kc4+=) 42.ed4+/– Kd4 43.f5 gf5 44.gf5 Ke5 45.a4 Kd5 46.Ke3 Kc4 47.Ke4 Kb4 (47...h5 48.Kf4+–) 48.Kd5 Ka4 49.Ke6 Kb5 50.Kf6 Kc6 51.Ke6 (51.Ke6 Kc5 52.f6+–) 1–0. Labahn,Wolfgang – Kempf, Alligator–Pokal D–Gr, 1980.

5.Nf3 Nd7 =.

4.ba5 e5

5.e3 Nc6 6.Bb5 Ra5 (6...Bd7 7.Nf3 e4 8.Nd4=) 7.Bc6 bc6 8.Qh5 e4 9.Be5 (9.d3 Nf6 10.Qe5 Qe5 11.Be5 Bf5 12.Bf6 gf6=) 9...Qe7+= 10.Bc3 Ra7 (10...Ra4 11.Ne2=) 11.Ne2 (11.d3 Nh6=) 11...Nf6 12.Qh4 Qd6 (12...Rg8 13.0–0=) 13.Bf6 Qf6 14.Qf6 gf6 15.a4 Rg8 16.0–0 Bd6 17.Nbc3 Bg4 18.Rfb1 Kd7 19.d3 Be2 (19...Be5 20.d4 Bd6 21.Nf4=) 20.Ne2 f5 21.Nc3 Be5 22.d4 Bg7 23.Ra3 Rga8 24.Rba1 (24.Rab3 f4+=) 24...f4+= 25.Rd1 Bh6 (25...fe3 26.fe3 f5 27.Kf2+=) 26.ef4= Bf4 27.Rb3 h5 28.Rbb1 (28.g3 Bd6=) 28...Bh6 29.Kf1 (29.h3 Bg7–/+) 29...Bg7 30.Rb3 f5 31.Ke1 h4 32.Ke2 (32.Kf1 c5 33.dc5 d4–/+) 32...c5 33.dc5 d4 (33...c6 34.Nd5 cd5 35.Rd5 Ke6 36.c4 Ra4 37.Rb6 Kf7 38.Rf5 Kg8 39.Rg5+=) 34.Rb4+= Kc6 35.Nb5 Increases the pressure on d4 (35.Rbd4 Bd4 36.Rd4 Kc5–/+) 35...Kc5 36.Rbb1 (36.Rbd4 Bd4 (worse is 36...Ra4 37.Ra4 Ra4 38.Nc7+=) 37.Nd4 Rg8–/+) 36...Ra4 37.Nc7 Rg8 38.Ne6 Kc4 (38...Kd5 39.Ng7 Rg7 40.Rb5 Kc4 41.Rf5 Rg2 42.Rf4 Rh2 43.Re4+=) 39.Rb7 Be5 40.Rd7 Rg2 41.Nd4 f4 (worse is 41...Bh2 42.Nf5 Kc3 43.Ne3+= (worse is 43.Nh4 Rg5=)) 42.Nc6 Bb2 43.Nd4 (43.Rc7 Kb5 (43...Rh2 44.Ne5 Kb4 45.Nc4+–) 44.Rb1 Kb6–+) 43...e3 (43...Rh2 44.Rc7 Kb4 45.Ne6–/+) 44.Rc7 Kb4 45.c3 Ka3 46.Kd3 (46.Rf1!? Rh2 47.Nf3 Rf2 48.Rf2 ef2 49.Nh4–/+) 46...Rf2–+ 47.Nc2 Ka2 48.Nb4 Kb3 49.Rb7 Ra8?? (better is 49...Rh2 50.Nc2 Ka2 51.Nb4 Rb4 52.cb4 e2 53.Ra7 Kb3–+) 50.Nc2= Ka4 51.Rb2 Rd8 52.Kc4 Rc8 53.Kd3 Rd8 54.Kc4 Rc8 55.Kd3 (55.Kd5 Rd8 56.Kc6 Rd1 57.Rb4 Ka5+/–) 55...Rd8= ½–½. Hiarcs 6 – Fritz 4, 20 min, 1998.

5.e3 Nf6 6.Nf3 Nc6 7.Bb5= e4 8.Nd4 (8.Ne5 Ra5 9.Bc6 bc6=) 8...Nd7 (8...Bd7 9.0–0=) 9.0–0 (9.Nc6 bc6 10.Be2 Qg6=) 9...Nd4 10.Bd4 Qg6 (10...Ra5 11.a4+=) 11.Bc3 c6 12.Be2 Bd6 13.Kh1 (13.f4 Nf6=) 13...Nf6+= 14.d3 Ng4 (14...Qh6 15.g3+=) 15.h3= Ne3 16.fe3 Qg3 17.Rf4 Qe3 18.Rg4 (18.Bg7?? Qf4 19.Qg1 Rg8–+) 18...Bg4 19.Bg4 Qf4 20.Qg1 e3 21.g3 (21.Ra2 d4 22.Bb4 0–0–/+) 21...Qg3 22.Qg3 Bg3 23.Bd4 (23.Bg7 Rg8 24.Bd4 Rg4 25.hg4 e2–+) 23...f5 (23...Bf4 24.Bg7 Rg8 25.Bc3–/+) 24.Bh5 Kd7 25.Nc3 g6 (25...Ra5 26.Rg1 f4–/+ (26...Ra3 27.Rg3 Rg8 28.Bf7+–)) 26.Rg1 (better is 26.Bh8!? Rh8 27.Ne2–/+) 26...Bf2–+ (26...gh5?! 27.Bh8 f4 28.Bd4=) 27.Rb1 Rhb8 28.Bf3 Bg3 (28...Ra5 29.Nd1–+) 29.Kg2 (29.Be3 Ra5 30.a4 Be5–/+) 29...Bd6 (29...Bf4 30.Bd5 cd5 31.Nd5–/+) 30.Be3 Ra5 31.a4 Raa8 (31...Be5 32.d4 Bc7 33.Bg5–/+) 32.Bd4 Ra6 33.Be2 (33.Bb6 h6–/+) 33...Ke6 (33...c5 34.Bf2 d4 35.Nd5–/+) 34.Be3 Raa8 35.Rb3 (35.Bf3 Be5 36.d4 Bd6–/+) 35...Be5 (35...g5 36.Bb6–/+ (36.Bg5? Rg8–+)) 36.d4 Bf6 37.Bd3 (37.Rb6 g5–/+) 37...g5 38.Rb1 f4 39.Bf2 h6 40.Kf3 Kd6 41.Bf5 (41.Rb6 Bd8 42.Rb1 b6–/+) 41...Kc7 42.Bg6 Rg8 43.Bf7 Rgd8 44.Be6 Ra6 (44...Rf8 45.Bg4–/+) 45.Bf7 Rh8 46.Bg6 Rb6 47.Rb3 Be7 48.Be1 Ra6 49.Bf7 Bf6 50.Rb4 Rh7 51.Bh5 (51.Bg6 Re7 52.Bf2 Ra8–/+) 51...Rg7 52.Bg4 Rg8 53.Bf2 Bd8 (53...Rf8 54.Rb1–/+) 54.Rb1 Re8 55.Bf5 Ra8 56.Bd3 (56.Bg6 Rg8 57.Bd3 Be7–/+) 56...h5 (56...Bf6 57.Rh1–+) 57.Rf1 Be7 58.Rg1 (58.h4 gh4 59.Rh1 Bf6+=) 58...Rg8 59.Be1 Bf6 60.Ne2 Rge8 61.Bf2 Rf8 62.Nc3 Be7 63.Be1 b6 64.Rg2 (64.Bf2 Ra5–/+) 64...Rg8 (64...Bf6 65.Bf2–/+) 65.Rg1 Bf6 66.Bf2 Rg7 67.a5? (better is 67.Ne2!?–/+) 67...ba5–+ 68.Na4 Be7 69.Nc5 (69.Be1–+) 69...g4 (better is 69...Bc5!? 70.dc5 Rag8–+) 70.hg4–/+ hg4 (better is 70...Bc5 71.dc5 hg4 72.Rg4 Rg4 73.Kg4 a4 74.Kf4 a3–+) 71.Kf4? (71.Rg4!? Rg4 72.Kg4 Bc5 73.dc5–/+) 71...Bd6 (71...Rf7 72.Kg3–+) 72.Ke3 Re8 73.Kd2 Bf4 (73...g3 74.Rg2–+) 74.Kd1 g3 75.c4 g2 (75...gf2 76.Rg7 Kc8 77.Be2+=) 76.cd5 cd5 77.Kc2 (77.Bb5 Be3 78.Be3 Re3–+) 77...Bh2 78.Rb1 Ree7 (78...g1Q A) 79.Rg1?? Bg1 (worse is 79...Rg1 80.Bg1 Bg1 81.Kc3–+) 80.Bb5 Reg8 81.Bg1 Rg1–+; B) 79.Rb7 Kd6 80.Bg1 Rg2 81.Bf2 Rf2 82.Kb3–+) 79.Bg1 (79.Rb7 Kc8 80.Rb1 g1Q 81.Bg1 Rg2 82.Kc3 Rg1 (82...Bg1?! 83.Bf5 Kc7 84.Rb7 Kd6 85.Rb6 Kc7 86.Rb7 Kd8 87.Rb8 Kc7 88.Rb7=) 83.Bf5 Kd8 84.Rg1 Re3 85.Bd3 Bg1 86.Nb7 Ke7 87.Na5 Bf2 88.Nc6 Kd6–+) 79...Bg1 80.Rg1 Kd6 81.Kd2 Rg4 82.Na4 (82.Nb3 a4 83.Na1 a3–+) 82...Re8 (better is 82...Rd4!? 83.Nb2 Rg4 84.Be2–+) 83.Nc3 Rh8 84.Nb5 (84.Ne2 Rh1 85.Ke3 Rg3 86.Kd2 a4–+) 84...Kc6 85.Nc3 (85.Ke1–+) 85...Rh1 86.Bb5 (86.Ne2 Rg1 87.Ng1 Rd4 88.Ke3–+) 86...Kb6 87.Rg2 Rg2 88.Ke3 (88.Be2 Kc6–+) 88...Rh3 89.Kf4 0–1. Fire 4 64_bit – Stockfish 5 64_bit, CCRL, 2014.

5.e3 Nf6 6.Nf3 Nbd7 7.Nc3 Ra5 8.Na2 (8.a4 Qc5=+) 8...Be7–/+ 9.c4 e4 10.Nd4 dc4 11.Bc4 Ne5 12.Qb3 (12.Be2 0–0–/+) 12...Nc4 13.Qc4 0–0 14.0–0 (14.Nc3 c5 15.Ndb5 Qd8–/+) 14...Rh5 15.g3 (15.f4 c5 16.Nb3 Be6–+) 15...Ng4 16.Qc3 (16.Nc3 Ne5 17.Qe2 Qh6 18.Ne4 Rh2–+) 16...Qh6 (better is 16...Nh2 17.Rfb1 c5–+) 17.Ne2? (better is 17.h4 Rc5 18.Qb3–/+) 17...Nh2 18.Qg7 Qg7 19.Bg7 Nf3 20.Kg2 Rh2# 0–1. Davis,David Neville – Bormida,Adolfo, IECG CUP95, 1995.

5.e3 Nf6 6.Nf3 Nbd7 7.d4 e4 8.Ne5 =.

4.b5 a4

5.e3 Bd7 6.c4 dc4 7.Bc4 c6 8.Nc3 cb5 9.Nb5 Bb5 10.Bb5 Nc6 11.Ba4 Nf6 12.Nf3 Nd7 13.0–0 e6 14.d4 Nb6 15.Bb5 f6 16.Qb3 Nd5 17.e4 Nc7 18.Ba4 b5 19.Bb5 Nb5 20.Qb5 Rb8 21.Qe2 Kf7 22.Rfd1 Na5 23.Bc3 Nb3 24.Bb4 Qb6? 25.Rab1 (25...Na5 26.Ba5 Qb1 27.Rb1 Rb1 28.Ne1+–) 1–0. Kuhn,Heinz (1675) – Schwabe,Manfred (1675), Voelklingen GER Cup Amateur GrC 1st, 2000.

5.e3 e5 6.d4 e4 7.c4 =.

5.e3 Nf6 6.c4 e5 7.d4 Nbd7 8.cd5 Nd5 9.Nd2 =.

5.e3 Nf6 6.c4 e6 7.Nf3 (7.Bf6 gf6 8.Nf3 e5+=) 7...Be7 (7...Nbd7 8.d4=) 8.Be5 (8.Nc3 Nbd7+=) 8...Qd8= 9.Be2 (9.Nc3 Nbd7=) 9...dc4 10.Bc4 Nbd7 (10...Nfd7 11.d4=) 11.Bb2 (11.d4 Ne5 12.Ne5 Nd7=) 11...Nc5 (11...Nb6 12.Be2=) 12.0–0+= Nb3 (12...0–0 13.d4 Nce4 14.Ne5+=) 13.Bb3+/– ab3 14.Qb3 Bd7 (14...0–0 15.d3+/–) 15.a4 0–0 16.Nc3 (16.Ne5 Bc8+/–) 16...Re8 17.Ne5 Bf8 18.Nd7 Qd7 19.d4 Rad8 20.Rfd1 Nd5 21.Ne4 f5 22.Nc5 Qf7? 23.Nb7+– Ra8 24.a5 Qg6 25.a6 f4 26.ef4 Nf4 27.Qf3 Bd6 28.Nd6 cd6 29.Re1 (29...Nd3 30.Re2+–; better is 29.Qf4 Reb8 30.Qd6 Rb5 31.Qc6+–) 1–0. ATUK – DoubleMint, Live Game Caissa's Web, 2005.

5.e3 Nf6 6.Nf3 Nbd7 7.c4 dc4 8.Bc4 Nb6 9.Be5 Qd8 10.Be2 Bf5 11.d4 e6 12.0–0 Bd6 13.Nbd2 0–0 14.Qc1 Ne4 15.Nc4 Nd5 16.Qb2 Ndc3 17.Rac1 Ne2 18.Qe2 Bg4 19.h3 Bh5 20.g4 Bg6 21.Rfd1 Qe7 22.d5 Be5 23.Nfe5 ed5 24.Rd5 Qh4 25.Qf1 Ng5 26.Kh2 Be4 27.Rd4 f6 28.f4 fe5 29.Ne5 Nh3 30.Qc4 Kh8 31.Re4 Nf4 32.Kg1 Qg3 33.Kf1 Nd3 34.Nf7 Kg8 35.Qd3 Rf7 36.Rf4 Rf4 0–1. Kreuzer – Trapp, Mosbach 1985.

5.e3 Nf6 6.Nf3 Bf5 7.d3 Qc5 (7...Nbd7 8.Nh4 Bg4 9.Be2 Be2 10.Qe2=) 8.Nd4 e5?? (better 8...Bg4 9.Be2 Be2 10.Qe2 Nbd7=) 9.Nf5+– Qb5 10.Be5 d4 (10...Qb6 11.Nc3 Nbd7 12.Bd4+–) 11.f4 (11.Bf6 Qf5 12.Bd4 Nc6+–) 11...Qb2 (11...de3 12.Nc3 Qc6 13.Qf3+–) 12.Nd2 (better 12.Bd4 Qb5 13.e4+–) 12...Ba3 (12...Nc6 13.ed4 Ne5 14.fe5 Nd5+–) 13.Bd4 Qb4 14.Rb1 (14.Rb1 Qf8 15.Qf3+–) 1–0. GuestLLWG – GuestXYBG, freechess.org, 2017.

5.e3 Nf6 6.Nf3 Bg4 =.

5.Nf3 Nd7 6.d4 =.

5.Nf3 f6 6.e3 Bg4 7.c4 (7.h3 Bh5+=) 7...c6 (7...e5!? 8.d4 e4=) 8.Nc3 e5 (8...dc4 9.Bc4 e5 10.Rc1+/–) 9.cd5 (9.bc6 bc6 10.cd5 cd5 11.Bb5 Nd7 12.Ba4 Rb8+/–) 9...cd5 10.Na4 Nd7 (10...e4 11.h3 Bh5 12.g4+=) 11.Qb3 (11.Nc3 e4 12.h3 Bh5+/–) 11...Be6 (11...Rc8 12.Nc3 Ne7 13.Rc1+=) 12.d4 (12.Rc1 Be7+=) 12...Ne7 (12...e4 13.Nd2+=) 13.Be2 Nf5 14.0–0 Be7 15.Rfc1 0–0 16.Nc5 e4 17.Nd2 (17.Nb7 Qb8 18.Nc5 Nc5 19.dc5 ef3 20.Bf3 Rd8+/–) 17...Rfb8? (17...b6 18.Ne6 Qe6 19.Ne4+–) 18.Bg4 (18.Nde4 Nc5 19.Nc5 Nh6+–) 18...g6? 19.Ne6 Qe6 20.a4 h5 21.Bf5 gf5 22.Ba3 Bd8 23.Bc5 Kh7 24.Bb4 Rc8 25.Rc3 Rc3 26.Qc3 Nb6 27.a5 Rc8 28.Bc5 Na8 29.b6 h4 30.a6 Nb6 31.ab7 White gets strong play along the open a–file 31...Rb8+/– 32.Qa3 Rb7 33.Bb6 Qb6 34.h3 Be7 35.Qa8 Qc7 36.Qa2 Qd6 37.Qa6 Rc7 38.Qd6 Bd6= 39.Ra6 White is in command 39...Rc1 40.Nf1+= Bh2 41.Kh2 Rf1 42.Ra2 Kg6 43.g3 hg3 44.Kg3 The passed pawn on h3 will become decisive later 44...Kg5? 45.Ra5+– Kg6 46.Kg2 Rd1 47.Rd5 Rd2 48.Kg3 Re2 49.Rd8 Kf7 50.h4 Ke7 51.Rd5 Ke6 52.Ra5 Rd2 53.h5 Rd1 54.Kf4 Rf1 55.Ra6 Kd5 56.Kf5 Rf2 57.Kg6 Rf3 58.Ra3 f5? 59.h6 f4 60.Ra5 Kc4 61.ef4 Rf4 62.h7 Rf8 63.Kg7 Rd8 64.Ra4 Kb5 65.Ra1 Rd7 66.Kg6 Rd8 67.Re1 Rd6 68.Kg5 Rd5 69.Kg4 Rd8 70.Re4 Rh8 71.Re7 Kc4 72.Kg5 Kd4 73.Kg6 (73...Kd5 74.Rd7 Ke4 75.Kg7+–) 1–0. Kreuzer,Uwe (1935) – Roes,H (2020), Simultanveranstaltung, 1993.

4.b5 c5

5.a4 e5 6.d3 Be6 7.Nd2 f6 (7...Nf6 8.Ngf3 Nbd7 9.e4+=) 8.e4= d4 9.Be2 Nh6 10.Bh5 (10.Bc1 Qc7=) 10...g6 11.Be2 Nd7 12.Ngf3 Qc7 13.c3 Nf7 14.c4 f5 15.ef5 gf5 16.g3 (16.0–0 0–0–0+=) 16...Be7 17.Bc1 Nf6 Black intends e4 18.Nf1 (18.Nb3 Rg8+=) 18...Rg8 19.h4 h6 20.N3h2 (20.Qc2 0–0–0–/+) 20...0–0–0 21.Bh5 (21.Qb3 Qb6–/+) 21...e4 22.Bf7 Bf7 23.Bf4 (23.Bh6!? ed3 24.Bf4–+) 23...Bd6–+ 24.Bh6 ed3 25.Qd3 Rde8 Black plans f4 26.Kd1 Ne4 27.Kc2 (27.Qf3 Bh5!! (worse is 27...Bc4 28.Kc1–+) 28.Qh5 Nf2 29.Kd2 Nh1 30.Qf5 Kb8–+) 27...Bg6 (better is 27...Re6 28.Qf3 Rh6 29.Qf5 Kb8–+) 28.Qf3 f4 29.Kb3 fg3 ½–½. Haisma,Henk – De Wit,Gerard, Groningen SO ON op–B, 2000.

5.Nc3 e5 6.e4= d4 7.Nd5 Be6 8.c4 Ne7 (8...Nd7 9.Qf3=+) 9.Nf3= h6 (9...Nd7 10.Rb1=) 10.Be2 (10.Bd3 Nd7=) 10...Nd7 (10...Bd5 11.cd5 Qg6 12.d3=) 11.Qc2 (11.0–0 A) < 11...Nd5 12.cd5 (12.ed5?! Bf5=) 12...d3 13.de6 fe6 14.Nh4 de2 15.Qe2+/–; B) 11...Rd8=) 11...g5 (11...Bd5 12.ed5 Qg6 13.Qg6 Ng6 14.d3=) 12.g3 (12.h3 Rd8= (12...Nd5? 13.cd5 Bd5 14.ed5+–)) 12...Ng6 (12...g4 13.Nh4=) 13.d3 (13.h4 g4 14.Nh2 h5=) 13...f5 (13...Bg7 14.h4 g4 15.Nh2=) 14.Nd2 h5 (14...Ne7 15.h4 Bg7 16.hg5 hg5 17.Rh8 Bh8 18.ef5 Bf5 19.Ne4 Be4 20.de4+=) 15.ef5+= Bd5 (15...Bf5 16.Bf3 0–0–0 17.Ne4 Be4 18.Be4+/– (< 18.de4 g4 19.Be2 Be7=)) 16.cd5+/– Ne7 17.Bf3 (17.Ne4!? Qb6 18.Bc1+/–) 17...Nf5+= (17...Nd5?? 18.Nc4 Qf6 19.Bd5+–) 18.Be4 (18.Ne4 Qg6+=) 18...Qf6= 19.Nc4 Be7 (19...Nd6 20.Nd6 Bd6 21.h4=) 20.Qd2 (20.Bc1 Nd6=) 20...0–0 (20...Nd6 21.Nd6 (21.Na5 Bd8 22.Nc6 bc6 23.dc6 Ba5 24.cd7 Ke7 25.Ba8 Bd2 26.Kd2 Qf2 27.Kc1 Ra8–+) 21...Bd6 22.Bc1=) 21.0–0–0 Nd6= 22.f4? Nb5 23.fe5=+ Ne5 24.Rhf1? Qg7 25.Rf5 Rf5–/+ 26.Bf5 g4 27.Kb1 Bg5 28.Qe2 Nf3 29.Nb6 Rf8–/+ 30.Be6 Kh7 31.Nd7 Be3 32.Nc5?? Qe7–/+ 33.Qc2 Ng5 34.Ne4 Ne6–/+ 35.de6 Qe6 36.Re1 Qb6 37.Ka1 Kg6 38.Qc4 Qc6 39.Qb3 Nc7–+ 40.a4 Qd5 41.Qa3 Rf7 42.Bc1 Na6 43.Be3 Nb4 44.Re2 de3 45.Qc3 Rf1 46.Re1 Qa2# 0–1. Dillimann,Hans Peter – Gulde,Josef, Afro97, 1997.

5.Nc3 Nf6 6.e3 =+.

5.bc6 Nc6 6.e3 Nf6 7.Nf3 Bg4 8.Be2 (8.Bb5 Rc8=) 8...e5 9.0–0 Be7 10.Nc3 0–0 11.Nb5 Qb8 12.d4 e4 13.Nd2 Bd7 14.c4 Re8 (14...Be6!?=) 15.cd5+/– Nd5 (15...Na7 16.Nc3 Bd6 17.h3+=) 16.Ne4 Ba3 (better is 16...Rd8!?+/–) 17.Ba3+– (< 17.Ra3 Re4 18.Bf3 Rh4+/–) 17...Re4 18.Bf3 Nf6 19.Be4 Ne4 20.Qd3 Bf5 21.f3 (21.Rfd1 Qc8 22.Qf1 Na7+–) 21...Nd6? (better is 21...Ng3 22.e4 Nf1+/–) 22.e4+– (22.Bd6?! Bd3 23.Bb8 Rb8+=) 22...Nb5 23.ef5?? (better is 23.Qb5 Nd4 24.Qc5+–) 23...Nbd4+= 24.Rfc1 (24.f6!?+=) 24...Qf4= 25.Bc5 Qf5 26.Qf5 Nf5 27.Re1 (27.Rcb1 Rb8 28.Rb5 g6+=) 27...f6 (27...b5 28.g4 Nh4 29.Kf2=+) 28.g4?? (better is 28.Reb1+=) 28...Nfd4–/+ 29.Bd4 Nd4 30.Red1 (30.Re7!? b5 31.Rc1 Nf3 32.Kg2 Nh4 33.Kg3=+) 30...Nf3–+ 31.Kg2 Ne5 32.Kg3 (32.Rdb1 Ra7–+) 32…Kf7 (33.Rab1 Ra7–/+; 32...a4!? 33.Rdb1 Ra7 34.Ra3–+) 0–1. b4_player (1950) – Kix284 (2240), GameColony.com, 2002.

5.Nf3 Nd7 6.e3 Ngf6 7.d4 b6 (7...cd4 8.Qd4 Nc5 9.Bd3=) 8.c4 dc4 (8...Bb7 9.cd5 cd4 10.Qd4 Qd5 11.Nbd2=) 9.Bc4 (9.Nbd2 c3 10.Nc4 Qc7 11.Bc3 Ne4+=) 9...e6= 10.0–0 Bb7 11.Nbd2 Qc7 12.Rc1 Bd6 13.Qe2 e5 (13...0–0 14.Rfd1=) 14.dc5 Nc5 15.h3 (15.Nb3 Nb3 16.Bb3 Qe7=) 15...Qe7 (15...0–0!?=) 16.Ba2+= 0–0 17.Nc4 Bf3 18.Qf3 (worse is 18.gf3 Bc7=) 18...Bc7 19.Rfd1 Rad8 20.Qf5 (20.Bb1 Rd1 21.Rd1 Qe6+=) 20...Nd3= 21.Rd3 g6 22.Qg5 (22.Ne5 gf5 23.Nc6 Qe4 24.Bf6 Rd3 25.Ne7 Qe7 26.Be7 Rc8=) 22...Rd3 23.Be5 (23.Ne5 Be5 24.Be5 Nd5+= (24...Qa3 25.Qf6 Qc1 26.Kh2 Qg1 27.Kg1 Rd1 28.Kh2 Rh1 29.Kh1 a4 30.Qg7)) 23...Be5 (23...Rfd8 24.Rf1 Kg7 25.Qf4 Be5 26.Ne5 Ra3 27.Nc6–+) 24.Ne5+= Rd2 25.Bb3 (25.e4 Ra2 26.Ng4 Rf2 27.Nf2 Qa3 28.Rc6 Qa1 29.Kh2+=) 25...Kg7 (better is 25...Qa3!? 26.Rb1 Qd6–+) 26.Ng4 (26.Rc6!?+=) 26...Ng8–/+ 27.Qf4 Qd6 28.Qc4 (28.Qd6!? Rd6 29.Ne5+=) 28...Ne7–/+ 29.Qc3 (29.Nh2!?–/+) 29...f6–+ 30.e4 Rc8 31.Qa1 Qd4 32.Qd4?? (better is 32.Ne3–+) 32…Rc1 (32...Rc1 33.Kh2 Rd4–+) 0–1. Farkas,Miso (2130) – Zobenica,Ivan (2030), Druga Liga – Vojvodina, 2011.

5.Nf3 Nf6 =.

5.Nf3 Bg4 6.d3 Nd7 7.Nbd2 Nb6 8.a4 Qc7 9.Be5 Qd7 10.Bg3 f6 11.e4 e5 Black intends d4 12.h3 Be6 13.Nh4 g5 14.Nhf3 d4 15.Nc4 (15.Be2!?+=) 15...Nc4+= 16.dc4 Bd6 17.Bd3 Ne7 18.Nd2 b6 19.Qe2 Ng6 20.0–0–0 0–0–0 21.f3 h5 22.h4 Rdg8 23.Rdg1 Nf4 24.Bf4 gf4 25.Qf2 Qf7 26.Kb2 Rg7 27.Kb3 Rhg8 28.Rh2 Qg6 29.Nf1 Kc7 30.Qe2 Be7 31.Qf2 Qe8 32.Kb2 Bd7 33.Qd2 Qd8 34.Qf2 Rg6 35.Qe2 R8g7 36.Qf2 Qg8 37.Qe2 Kd6 38.Kb3 Be6 39.Qf2 Rg3! 40.Qe2 (40.Ng3 fg3 Double attack) 40...Rh3! 41.Qf2 (41.gh3 Rg1 Pinning (41...Rg1 Deflection; 41...Rg1 Clearance); 41.Rh3 Bh3 Combination) 41...Bd7 42.Rgh1 Rgg3 (42...Rgg3 43.gh3 Rg6+–). Abicht,Ruediger (1810) – Roettinger,E (2145), Pyramiden Cup, 2015.

4.b5 c6

5.e3 cb5 6.Bb5 Nc6 7.Nf3 Nf6 8.0–0 Bg4 9.h3 Bh5 10.Qe2 (10.a4 e6+/–) 10...e6+= 11.g4 Bg6 12.Be5 Qc5 13.Nc3 Be7 (better is 13...Nd7!?+=) 14.Na4+/– Qc2?? (better is 14...Qa7 15.Bd4 Qb8+–) 15.Nd4+– Qe4 16.f4 0–0 17.d3 Nd4 (17...Qe5 18.fe5 Ne5 19.Nb6+–) 18.Bd4 (18.de4? Ne2 19.Be2 Ne4–+) 18...Qd4 19.ed4 Rac8 (19...Bd6 20.Nc5 Bc5 21.dc5+–) 20.f5 ef5 (20...Bd6 21.fg6 hg6 22.Qd2+–) 21.Qe7 fg4 22.hg4 Ng4 23.Bd7 Rc7 24.Qd6 Rc2 25.Bg4 Bd3 26.Rf7! Rf7 (26...Rf7 27.Qd8; 26...Kf7 27.Qe6) 27.Qd8 Rf8 28.Be6 1–0. Pamieci Krzysztofa P – napohybel, internet, 2016.

5.e3 e5 6.Nf3 Nd7 7.d4 e4 8.Nfd2 f5 9.a4 Ngf6 10.c4 Qe7 11.Nc3 Qf7 12.Qb3 Bd6 13.cd5 cd5 14.g3 Nf8 15.h4 Be6 16.Ba3 Ba3 17.Qa3 N8d7 18.Rc1 Qe7 19.Qe7 Ke7 20.Ne2 Rhc8 21.Rc8 (21.Nc3 Rc7 22.Nb3 Rac8=+) 21...Rc8=+ 22.Bh3 (22.Nb3!?=+) 22...Rc2 23.Kd1 Ra2 24.Nc3 Ra1 25.Ndb1 Nb6 26.Kc2 Nc4 (better 26...Na4 27.Na4 Ra4–/+) 27.Bf1= Na3?? (27...Nb6 28.Kb2 Ra4 29.Na4 Na4 30.Kb3+=) 28.Kb2?? (better 28.Na3 Ra3 29.Be2+–) 28...Nb1= 29.Nb1? (better 29.Bh3!?=) 29...Ra4–/+ 30.Be2 Rb4 31.Kc2 Nd7 (better 31...Ng4 32.Nc3 Nf2–/+) 32.Nc3= Nb6 33.Ra1 Nc4 34.Bc4 dc4 (better 34...Rc4!? 35.Ra5 Kd6=) 35.Ra5+– Kd6 36.Ra8 Kc7? (36...Bd7 37.Rf8+=) 37.d5?? (better 37.Rh8 h6 38.Rh7+–) 37...Bd7+= The isolani on b5 becomes a target 38.Rg8 Bb5 (38...g6!?+=) 39.Rg7+– Kd6 40.Rh7 Ba4 41.Na4 Ra4 42.Rb7 Ra2 43.Rb2 Rb2?? (better 43...Ra1+–) 44.Kb2+– Kd5 45.Kc3 f4 (45...Ke6 46.Kc4 Ke5 47.Kc5+–) 46.h5 fg3 47.fg3 Ke5 48.h6 Kf5 49.h7 Kf6 50.h8Q Kg5 51.Qd4 (51.Qd4 Kf5 52.Qd7 Kg6 53.Qe6 Kg5 54.g4+–) 1–0. BeepBeepImAJeep (2610) – andreigronivo (1950), lichess.org, 2016.

5.e3 e5 6.Nf3 f6 7.Be2 a4 (7...e4 8.Ng1=) 8.0–0 Bg4 9.d3 (9.Nc3!?+=) 9...cb5= 10.Nbd2 Nc6 11.h3 Be6 12.d4 e4 13.Ne1 b4 14.Bb5 Ra5 (worse 14...ba3 15.Ba3 Qc7 16.Bf8 Kf8 17.Ba4+=) 15.Be2 (15.Qe2 Nge7=+) 15...Nh6 (15...b5–/+) 16.f3 (16.c4 Qc7=+ (worse 16...ba3 17.Ba3 Qd7 18.Bf8 Rf8 19.Ra4+=)) 16...f5 (16...Nf5 17.Qc1–+) 17.Kh1 (17.c3 b3–/+ (17...ba3?! 18.Ba3 Qg3 19.Bf8 Rf8 20.Ra4=+)) 17...Be7 (17...Qg3 18.ab4 Bb4 19.Ba3–/+) 18.ab4 (18.c4 Qg3 19.c5–/+) 18...Nb4 (18...Qb4 19.Rb1–/+) 19.Ba3 (better 19.c3!? Nc6 20.Ra4=+) 19...Qc7–/+ 20.Bb4 (better 20.c4!? dc4 21.fe4 fe4 22.Qb1=+) 20...Bb4–+ 21.Qc1? (21.Nb1 Qg3 22.c4 Be1 (worse 22...dc4 23.Ra4 Bd6 24.f4 Ra4 25.Qa4 Ke7 26.Bc4–/+) 23.Re1 dc4 24.Ra4 ef3 25.Bf3 Qe1 26.Qe1 Ra4–/+) 21...0–0 (21...Qc3 22.Bb5 Rb5 23.Ra4–+) 22.c3? (22.c4–+) 22...Qc3 (22...Bc3?! 23.Ra2 Rc8 24.Nb1 ef3 25.Nf3–+) 23.Qc3 Bc3 24.Ra2 b5 25.Nb1 Rc8 (25...Be1 26.Re1 b4 27.Nd2–+) 26.Nc2 Nf7 27.f4 Nd6 28.Nba3 (28.Kg1–+) 28...b4 29.Nb1 (29.Nb4 Bb4 30.Rb1 Ba3 31.Ra3 Nc4 32.Bc4 dc4–+) 29...b3 30.Ra3 Nc4 (better 30...Bb2 31.Na1 Ba3 32.Na3–+) 31.Bc4 Rc4 (31...dc4?! 32.Nc3 bc2 33.Rc1–+; 31...bc2?! 32.Nc3 Rc4 33.Rc1–+) 32.Na1 Bb2 (better 32...Ba1 33.Ra1 Bd7 34.Kh2–+) 33.Nb3 Rb5 (33...ab3?! 34.Ra5 Bc1 35.Re1–/+) 34.Ra2 (34.N3d2 Rcb4 35.Ra2 Rb8–+) 34...a3 (better 34...Rb3 35.Nd2 Rbb4–+) 35.N1d2? (better 35.Nc5 Rcc5 36.dc5–+) 35...Rc2 36.Rd1 Bd7 (36...Rc3 37.Nc5 Rbc5 38.dc5–+) 37.Kg1 (37.Nc5 Bc8–+) 37...Rb4 38.Nc5 (38.Na1 Rc3 39.Kf2 Ba4–+) 38...Bb5 39.Ndb3 (39.Nb1 Be2 40.Re1–+) 39...Bc4 40.g4 (40.Rda1 Ba1 41.Rc2 Bb3 42.Nb3 Rb3 43.Rc8 Kf7–+) 40...Bb3 41.Nb3 Rb3 42.gf5 (42.Re1–+) 42...Re3 43.f6 gf6 44.Rb2 Ree2 (44...ab2 45.Kh1 Rc1 46.Kg2 Rd1 47.Kf2 Rde1 48.Kg2 R1e2 49.Kf1 b1Q) 45.Rc2 (45.Rb8 Kg7 46.Rb7 Kg6–+) 45...Rc2 46.Ra1 (46.Rb1 a2 47.Ra1 Rb2 48.Ra2 Ra2–+) 46...a2 47.Kf1 Rb2 48.Rc1 (48.Ra2 Ra2 49.h4–+) 48...Rb1 49.Rb1 (49.Rd1 Rd1 50.Kf2 a1Q 51.Kg3 Rg1 52.Kh4 Qc3 53.f5 Qg3 54.Kh5 Qh3) 49...ab1Q 50.Ke2 (50.Kg2 Qc2 51.Kg3 Qc3 52.Kh2 e3 53.Kg3 e2 54.Kg4 e1Q 55.Kf5 Qcg3 56.Kf6 Qf4) 50...Qd3 51.Kf2 Qd4 (51...Qf3 52.Kg1 e3 53.h4 Qf2 54.Kh1 e2 55.h5 e1Q) 52.Kg3 (52.Ke2 Qb2 53.Ke1 e3 54.f5 Qd2 55.Kf1 Qf2) 52...e3 (52...Qg1 53.Kh4 d4 54.Kh5 Qg3 55.f5 Qh3) 53.f5 (53.Kf3 Qd2 54.Kg3 Qf2 55.Kg4 Qg2 56.Kf5 Kf7 57.h4 Qg6) 53...Qe4 54.Kh2 (54.h4 e2 55.h5 e1Q 56.Kh3 Q1h4) 54...Qf5 (54...e2 55.h4 e1Q 56.h5 Q4h1) 55.Kg3 (55.h4 e2 56.h5 Qf4 57.Kg2 e1Q 58.h6 Qef1) 55...Qf2 56.Kg4 e2 57.Kh5 (57.h4 e1Q 58.h5 Qe6) 57...e1Q 58.Kh6 (58.Kg4 Qee2) 58...Qe4 (58...Qh4) 59.Kh5 Qeh4 (59...Qfh4) 0–1. Dino_Jarach (1820) – Roth2016 (1855), lichess.org, 2018.

4.b5 Nd7

5.d4 Nb6 6.e3=+.

5.d4 Ndf6 6.e3=.

5.d4 e5 6.de5 Ne5 7.e3 (7.Nd2 Nf6=+) 7...Be7 (7...Bg4 8.Be2 Be2 9.Ne2=) 8.Nf3 (8.f4 Ng4 9.Bg7 Ne3=) 8...Nf3 9.Qf3 Nf6 (9...Bf6 10.Nc3=) 10.h3 0–0 11.Nd2 (11.Bd3 c5=) 11...Be6 (11...c6 12.Bd3=) 12.c4 (12.Bd3 c5=) 12...dc4 (12...Rad8 13.Bd4=) 13.Nc4 (13.Qb7?? Bd5 14.Nc4 Qd8–+ (14...Bb7?! 15.Nd6 Bd6 16.Bf6 gf6 17.Bd3–+); worse 13.Bc4 Rfd8 14.Rd1 Bc4 15.Nc4 Qc5–/+) 13...Qc5 14.Ne5 (14.Bd4 Qd5=) 14...Qc2 (14...Bd5 15.Qf4=) 15.Qe2 Qb3 16.g3? (better 16.Nf3=) 16...Ne4–+ 17.Bg2 Bb4! 18.ab4 Qb4 19.Kf1 Nd2 20.Qd2?? (better 20.Kg1 Qb2 21.Rd1 Qe5 22.Rd2–/+) 20...Qd2–+ 21.Bd4 Rab8 (21...f6!? 22.Nf3 Qd3 23.Kg1 Qb5 24.Kh2–+) 22.Be4 Rfe8 (22...f6 23.Nf3 Qb4 24.Bd3–+) 23.Kg2 f6 24.Nf3 Qe2 25.Ra5 Bh3! 26.Rh3 (26.Kh3 Re4 Discovered attack; 26.Rh3 Re4 Discovered attack) 26...Re4 27.b6 (27.Rh1 Re6–+) 27...Rc8 (27...cb6 28.Bb6 Rb4 29.Nd4–+) 28.Rh1 (28.bc7 h6 29.Bc5 Qd3–+) 28...cb6 29.Bb6 Re6 (29...Rb4 30.Bd4–+) 30.Bd4 (30.Nd4 Qc4 31.Rb1 Rd6–+) 30...Ra6 31.Re1 (31.Ra6 ba6 32.Re1 Qc4–+) 31...Qe1 (31...Ra5 32.Re2 b5 33.Rb2+=) 32.Ra6 (32.Ne1 Ra5 33.Nd3 b5–+) 32...Qb1 (32...Qe2 33.Ra1–+) 33.Nd2 (33.Rb6 Qe4 34.Rb5–+) 33…Qc2 (33...Qc2 34.Rf6 gf6–+; 33...ba6?! 34.Nb1 a5 35.Nc3=) 0–1. carlog (1835) – andytop10 (1990), gameknot.com, 2017.

5.e3 e5 6.c4 (6.d4 Ngf6=) 6...Ngf6 (6...dc4 7.Bc4 Qg6 8.Bf1+=) 7.d4 dc4 8.Bc4 Nb6 9.Bb3 e4 10.Ne2 Be6 (10...a4 11.Bc2=) 11.Nd2 Bb3 12.Qb3 Qd5 13.Qd5 Nbd5 14.Ng3 a4 15.Nge4 Ne4 16.Ne4 Ra5 17.Nc3 Nc3 18.Bc3 Rb5 19.Kd2 Kd7 (19...b6 20.e4=) 20.Rab1 (20.e4 Bd6=) 20...Rb1 21.Rb1 Ba3 22.Ra1 Bd6 23.Ra4 h5 (23...b5 24.Ra1=) 24.h3 f5 25.f3 Rh6 26.Kd3 Rg6 27.Ra2 c6 28.e4 (28.Be1!?+=) 28...fe4= 29.Ke4 (29.fe4? Rg3 30.Kc2 Rg2 31.Kb3 Ra2 32.Ka2 g5–+) 29...Re6 30.Kd3 h4 (30...Bf4 31.Bd2 Bd2 32.Rd2=) 31.d5 (31.Ra7 Kc7=) 31...Rg6 (31...cd5 32.Bg7 Rg6 33.Bd4=) 32.dc6= Kc6 33.Bd4 b5 34.Ra6 Kd5 35.Rb6 b4 36.Rb5 Kc6 37.Rh5 (37.Rb6 Kc7 38.Bc5 Rf6 39.Rd6 Rd6 40.Kc4 Re6–+) 37...Be7 (37...Rg2 38.Rh4 Kd5 39.Rg4 Rg4 40.hg4–/+) 38.Re5= Bd6 39.Re2 (39.Rh5 Rg2 40.Rh4 Rg3+=) 39...Kb5+= 40.Ra2 (40.Rb2 Be7 41.Re2 Bf6+=) 40...b3 41.Ra7 (41.Re2 Bb4 42.Re8 Ba5 43.Re5 Ka4+=) 41...Rg2 (better is 41...Bc5!? 42.Bc5 Kc5 43.Rc7 Kd5–/+) 42.Rb7+= Kc6 43.Rb3 Rg3 44.Ke4 Rh3 45.Bg7 Rh1 46.f4 ½–½. Brazhnikov,Vladimir – Sitnikov,Dmitrij, Novokuznetsk Winter Open, 2010.

5.e3 Ngf6 6.d4 =.

4.b5 e5

5.a4 Nf6 6.Nf3 Nbd7 7.g3 c5 (7...e4!? 8.Nd4 Ne5–/+) 8.d3= b6 9.Bg2 Bb7 10.0–0 Be7 11.Nh4 g6 12.c4 Rb8 (12...0–0 13.Nc3=) 13.Nd2 (13.cd5 Nd5 14.Nf3 Qe6+=) 13...d4= 14.Bb7 Rb7 15.Ng2 (15.Nhf3 0–0=) 15...Qe6 16.Nf3 0–0 17.Bc1 Re8 18.Ng5 Qd6 19.f4 (19.Qc2 h6 20.Nf3 Bf8+=) 19...Bf8 (19...h6 20.Ne4 Ne4 21.de4 ef4 22.gf4+=) 20.Qc2 (20.f5 Bg7=) 20...Bg7 (20...h6!? 21.Ne4 Ne4 22.de4 ef4 23.gf4 Qe6=) 21.f5= Nf8 (21...e4 A) worse is 22.de4 h6 23.Bf4 Qe7 24.Nf7 Kf7 (worse is 24...Qf7 25.e5 Ne5 26.Be5 Re5 27.fg6–+) 25.fg6 Kg8–+; B) 22.fg6 fg6 23.Bf4+=) 22.Ne4 Ne4 23.de4 Rd7 24.Qd3 gf5 (24...Qe7 25.g4=) 25.Rf5+= Ng6 26.Bg5 Qf8 (26...f6 27.Bd2=) 27.Raf1+= Re6 28.h4 (better is 28.Qf3+/–) 28...Bh6? (better is 28...f6!?+=) 29.h5+– Nh8 (29...Ne7 30.Rf7 Qf7 31.Rf7 Kf7 32.Qf3 Ke8+–) 30.Bf6 Rdd6 31.Bh8 Kh8 32.Rf7 Qg8 33.R7f5 Rd8 34.Kh2 Qg4 35.Qf3 Rg8 36.Rf7 Qg5 37.Nh4+– Bg7 38.Nf5 Bf6 39.Kg2 Bd8 40.Rh1 Rf6 41.Rf6 Bf6 42.Rh4 Bd8 43.Rg4?? Qg4–+ 0–1. Valenta,Vit (2130) – Pribyl,Josef (2265), Pardubice CZE, Czech Rapid Open, 2014.

5.c4 dc4 6.Nf3 Nd7 7.Qc2=.

5.c4 Nf6 6.cd5= Qd5 (6...Nbd7 7.Nc3 Nd5 8.e3=) 7.Nc3 Qe6 8.Nf3 Bc5 (8...Nbd7 9.g3=) 9.e3+= Nbd7 10.d4 Bd6 11.Bd3 b6 (11...Qe7 12.Ne4 Ne4 13.Be4 ed4 14.Qd4=) 12.0–0 (12.Ng5 Qg4 13.Qg4 Ng4+–) 12...Bb7+= 13.Ng5 Qe7 14.Nce4 (14.Qc2 h6 15.Nge4 0–0+=) 14...h6= 15.de5 (15.Nf6 Nf6 16.de5 hg5 17.ed6 Qd6=) 15...Be5 16.Be5 Ne5 17.Nf6 Qf6 18.Be4 Rb8 19.Bb7 Rb7 20.Ne4 Qe6 21.f4 Nd7 22.Qf3 Rb8 23.Rac1 (23.f5 Qe7+=) 23...f5+= 24.Nc3 Nc5 25.e4 fe4 26.Ne4 Ne4 (26...Qe4 27.Rfe1 Qe1 28.Re1 Kf7 29.Qh5 g6 30.Qd5 Kf8 31.f5+–) 27.Rfe1 0–0 28.Re4 Qd7 29.Qb3 Kh7 30.Qc2 Kh8 31.g3 (31.a4 Rbe8 32.Rc4 Rf7+=) 31...Qb5= 32.Re7 c5 33.Qc3 Rf6 34.Qe5 Rbf8 (34...Rd8 35.Rg7 Kg7 36.Qe7 Rf7 37.Qd8=) 35.Rd1 Kh7 36.Qe4 Kh8 37.Rdd7 Rg8 38.a4 Qb2 39.Qc4 Qb4 40.Qc2 b5 (40...Rc6 41.Kg2=) 41.ab5 (41.Re4 c4 42.ab5 Qb5=) 41…Qb5 0–1. DEFFM (2415) – ExpandingFrequency13 (2590), lichess.org, 2020.

5.d4 ed4 6.Qd4 Nf6 7.c4 (7.Nf3 Be7=) 7...dc4=+ 8.Qc4 Be6 9.Qc2 Nbd7 10.Nf3 Qc5 11.Qc5 Nc5 12.Nbd2 Be7 13.e3 0–0 14.Be2 Bf5 15.0–0 Rfd8 16.Rfc1 Nfd7 17.a4 Be6 (17...Bd3 18.Bd1=+) 18.Nd4= Bf6 19.Ba3 Na4 20.Rc7 Be5 21.Rcc1 Ndb6 22.N2f3 (22.Ne6?? Rd2 (22...fe6?! 23.Ne4=) 23.Bg4 Ba1–+) 22...Bf6 23.Ne6 fe6 24.Nd4 Bd4 25.ed4 Rd4 26.Rc7 Rb8 27.Bh5 (27.Rac1 h6=) 27...g6 28.Bf3 Nd5 29.Bd5 Rd5 30.g3 Rb5 31.Be7 Nb6 32.Bf6 Nd5 33.Rg7 Kf8 34.Be5 Ne7 35.Re7 Re5 (worse 35...Ke7 36.Bb8 e5 37.f3+–) 36.Rh7 Kg8 37.Re7 ½–½. rkolanek1 (2165) – armandoazevedo (2265), gameknot.com, 2014.

5.e3 a4 6.Nf3 (6.d4 e4=) 6...f6 (6...Nd7 7.c4=) 7.c4 (7.Be2 Ne7=) 7...Be6 (7...Bg4 8.d4 e4 9.h3=) 8.cd5 Bd5 9.Nc3 Bb3 10.Qc1 c5 11.d3 (11.Ne4 Qd5 12.d3 Nd7+=) 11...Nd7 (11...Qb6 12.Nd2+=) 12.Be2+= f5 (12...Be7 13.Nd2+=) 13.e4 (13.Nd2 Bf7+=) 13...f4 (13...g6 14.0–0=) 14.Nd2+= Qg6 15.Bf3 (15.0–0 Be6+=) 15...Be6 16.Qd1 h5 (16...Ngf6 17.Nc4+=) 17.Na4 Ngf6 (17...h4 18.Nc4+/–) 18.Rc1 (18.Nc4 Bc4 19.dc4 h4+/– (19...Ne4?? 20.Qc2+–)) 18...Ra5 (18...h4 19.Nc4 h3 A) < 20.Be5 Bc4 21.Bf6 Bb5–/+ (< 21...Nf6 22.Rc4 hg2 23.Rg1+=; 21...hg2?! 22.Rg1–/+); B) 20.Ne5 Ne5 21.Be5+/–) 19.Nc3 Qf7 (19...h4 20.Nc4 Bc4 21.dc4+/–) 20.a4 (20.Nc4 Ra8+/–) 20...g5 21.h3 Qg8 22.Nd5+/– Bd5 23.ed5 g4 24.hg4 hg4 25.Rh8 Qh8 26.Bg4 Qh1 27.Nf1 Ng4 28.Qg4 Ra4 29.Be5! Qh6 30.Ra1 f3? 31.Qa4+– fg2 32.Qe4 Ne5 33.Qg2 Nd3 34.Kd1 Qh5 35.Kd2 c4 36.Qe4 Kd7 37.Qe6 Kc7 38.b6 Kb8 39.Ra8! (39...Ka8 40.Qc8#) 1–0. Nilsson,Nils Roland – Larsson,Alf, corr SSKK 2–776, 1994.

5.e3 Nd7 6.Nf3 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.Nf3 Nd7 5.e3 a5 6.b5).

5.e3 Be6 6.Nf3 (6.d4 e4=) 6...Nd7 7.d3 (7.Be2 Be7=) 7...Be7 8.Nbd2 Bf6 (8...Ngf6 9.c4=+) 9.Be2 (9.c4 Nh6=) 9...Bg4 (9...Ne7 10.c4=) 10.Rb1 (10.e4 0–0–0=) 10...Ne7 11.0–0 0–0 12.c4 Nc5 (12...Rfd8 13.cd5 Nd5 14.Ne4+=) 13.Qc2 (13.cd5 Qd5 14.Ne5 Be2 15.Qe2 Be5 16.Be5 Qe5+=) 13...e4 (13...d4!?=) 14.de4 (14.Bf6 Qf6 15.de4 de4 16.Ne4 Qg6=) 14...de4 (14...Bb2 15.Rb2 (15.Qb2?! de4 16.Nd4 Be2 17.Ne2 Rfd8=+) 15...de4 16.Ne4 Ne4 17.Qe4+/–) 15.Bf6+/– Qf6 16.Ne4 Qf5 17.Bd3 (17.Nd4 Qe4 18.Qe4 Ne4 19.Bg4 Nd2+=) 17...Bf3 18.gf3 Nd3 19.Qd3 Rad8 20.Qe2 Ng6 21.Ng3 Qh3 22.Kh1 Nh4 23.Rg1= Rd2 24.Qf1 Qe6 25.Ne4+= Rc2 26.Qd3 Rc4?? 27.Ng5+– (27…Qf5 28.Qc4 Nf3 29.Nf3 Qf3 30.Rg2+–) 1–0. Sale,Srdjan (2425) – Pandurevic,Miro (2220), Zagreb op, 1997.

5.e3 Ne7 6.a4 c5 7.d4 cd4 8.ed4 e4 9.Ba3 Qc7 10.c4 dc4 11.Nd2 Bf5 (11...c3 12.Ne4 Nd5 13.Bf8=) 12.Bc4+= Nc8 13.Bf8 Kf8 14.Rc1 Qe7 15.Qb3 Nd7 16.Ne2 Ndb6 17.0–0 Nd6 18.Nf4 (18.Bd5 Re8+=) 18...Qd7 (18...Qh4!? 19.Qe3 Na4 (worse is 19...Ndc4 20.Nc4 Nc4 21.Rc4+/–) 20.Bf7 Kf7 (worse is 20...Nb5 21.Bd5+/–) 21.Qb3 Kf8+=) 19.Qa3 Kg8 20.Ba2 h6 21.Rc5 Kh7 22.Nd5 Nd5 23.Rd5 Rhd8 24.Rc1 Be6 25.Rdc5 Ba2 26.Qa2 Rac8 27.Qd5 Qe6 ½–½. Seslavin,Maxim (1960) – Chernov,Mikhail (2235), Novokuznetsk RUS, Summer Open, 2013.

5.e3 Bf5 6.Nf3 Nd7 7.d4 e4 8.Nfd2 h5 (8...Qg6!?=) 9.c4+= b6 (9...Qg6!?+=) 10.Nc3+– Nh6 11.a4 (11.cd5 Qg6+–) 11...Ng4 12.Ba3 Qg6 13.Bf8 (13.cd5 Ba3 14.Ra3 Nh2 15.Rh2 Qd6 16.Rh5 Rh5 17.Qh5 Qa3 18.Qf5 Qc3 19.Qe4 Kf8+–) 13...Nf8 14.h3 Nf2? (better 14...Nf6+–) 15.Kf2+– Ne6 16.Nd5 h4 17.Kg1 Rh5 18.Nf4 (better 18.Qe1+–) 18...Nf4 19.ef4 0–0–0 20.d5 e3 21.Nf3 Be4? (21...Qg3 22.Ra2 Qf4 23.Bd3+–) 22.Be2 (better 22.Ra3 Qg3 23.Re3+–) 22...Rg5?? (22...Qg3 23.Qf1 Rf5 24.Qe1 Rf4 25.Qg3 hg3 26.Ra3+–) 23.Rh2 (better 23.Ng5 Re8 24.c5 bc5 25.Ra3+–) 23...Rg3 24.Ra3 (24.Ng5 Re8+–) 24...Qf6? (better 24...Bf3 25.Bf3 Re8+–) 25.Re3 Qd4 (25...Bg6+–) 26.Qd4 (26.Qd4 Bf3 27.Bf3+–) 1–0. BeepBeepImAJeep (2545) – lapsusmanus (1910), lichess.org, 2016.

5.e3 Nh6 6.Nf3 (6.d4 ed4 7.Qd4 Nf5=) 6...e4 (6...Nd7 7.d4 e4 8.Ne5=) 7.Nd4 Nd7 8.d3 ed3 (8...Nf6 9.de4 de4 10.Nd2=) 9.Bd3 Be7 10.a4 (10.Nc3 Nc5=) 10...Ne5 (10...Nc5=) 11.0–0 (11.Ba3 Qf6=) 11...c5 (11...Nhg4 12.Ba3 Qd7+=) 12.bc6= bc6 (worse is 12...Nd3 13.cb7 (worse is 13.cd3 Ng4 14.Nf3 bc6+=) 13...Bb7 14.cd3+/–) 13.Nd2 0–0 14.N2f3 Nd3 15.cd3 (worse is 15.Qd3 Ba6 16.Qc3 Bf1 17.Rf1 Rfc8–+) 15...c5 16.Ba3 (16.Nb5 Qd8=) 16...Qf6 17.Ne2 Be6 18.Nf4 Nf5 19.Rb1 Bd6 20.Ne6 Qe6 (20...fe6 21.Qd2=) 21.h3 (21.Re1 Rfb8=) 21...h6 (21...Rfc8 22.Qd2=) 22.Qd2 c4 (22...Rfc8 23.Rfc1=) 23.Bd6+= Nd6 24.Nd4 Qf6 25.Rfd1 Rfc8 26.Ne2 (26.Rb6 Qe5 27.Rdb1 Rc5+=) 26...Qh4 (26...Rc5 27.Qc3 Qg5 28.Nf4+=) 27.Qa2 (27.dc4 Ne4 28.Qe1 Rc4=) 27...Ra6 28.Qa3 Rac6 29.Nd4 Ra6 30.Qc3 g6 (30...Qg5!?=) 31.Ne2+= Rac6 32.Qa5 cd3 33.Rd3 Rc2 34.Qe1 (34.Rd4 Ne4 35.Qe1 Qh5+/–) 34...Qa4 35.Rd5 Qc4 (35...Ne4 36.Qd1 Kg7 37.Rd4+/–) 36.Rd2 Rd2 37.Qd2 Ne4 38.Qd4 Qe2 39.Qe4 Qc2 40.Qc2 Rc2 41.Rb5 Rc1 42.Kh2 Kg7 43.g4 g5 44.Ra5 Kg6 45.Ra6 Kg7 46.Kg2 Rd1 47.Ra5 Kg6 48.Rc5 Re1 49.Rc6 Kg7 50.Rb6 Ra1 51.f3 Ra3 52.e4 Ra1 53.Rb2 Ra5 54.Kg3 Ra1 55.h4 Ra3 (55...gh4 56.Kh4 Rh1 57.Kg3+/–) 56.h5+– Kf6 57.Rb6 Kg7 58.Rb8 Ra2 59.Rb1 Rc2 60.Ra1 Rd2 61.Ra6 Rd1 62.Kf2 Rb1 63.Ra2 (63.Rd6 Rb3+–) 63...Rb3 64.Rc2 Rb1 65.Rc3 Kf6 66.Rc6 Kg7 67.Rc5 Rb2 68.Kg3 Rb1 69.Rc2 Rb3 70.Rc1 Kf6 71.Ra1 Rb6 72.Ra7 Ke6 73.e5! Ke5 74.Rf7 Rc6 (74...Ke6 75.Rf8+/–) 75.Rf5 (75.f4 gf4 76.Rf4 Ra6+/–) 75...Kd4 (75...Ke6 76.Ra5+/–) 76.Ra5 (76.f4 Rc3 77.Kf2 gf4 78.Rf4 Ke5 79.Rf5 Ke6+/–) 76...Re6 (76...Rb6 77.Ra4 Ke5 78.f4 gf4 79.Rf4+/–) 77.Ra4 Kd5 78.Ra2 (78.f4 Re3 79.Kf2 gf4 80.Rf4 Re7+–) 78...Rc6 79.Ra8 Kd4 80.Ra1 Rf6 (80...Rb6 81.Ra4 Kd5 82.f4 Rb3 83.Kf2 Rb2 84.Ke3 Rb3 85.Kd2 gf4 86.Rf4+/–) 81.Rc1 (81.f4!? gf4 82.Kf3+–) 81...Rb6+/– 82.Rc2 Ra6 83.Re2 Rc6 84.Re4 Kd5 85.Re1 Kd4 86.Rb1 Ra6 87.Rb3 Ke5 88.Rb2 Rc6 89.Rb1 Ra6 90.Rc1 Kd5 91.Rd1 Ke5 92.Rd3 Rd6 (92...Rb6 93.Re3 Kd4 94.Kf2+/–) 93.Re3 (93.Rd6 Kd6 94.f4 gf4 95.Kf4 Ke6+=) 93...Kd4 94.Re4 ½–½. Stockfish 6 64_bit 4CPU – Texel 1?05 64_bit 4CPU, CCRL, 2015.

5.Nf3 Nd7 6.d4 e4 7.Nfd2 =+.

5.Nf3 Nd7 6.e3 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.Nf3 Nd7 5.e3 a5 6.b5).

5.Nf3 e4 6.Nd4 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.Nf3 e4 5.Nd4 a5 6.b5).

5.e3 c5

6.c4 d4 7.ed4 ed4 8.d3 Nf6 9.Be2 Be7 10.Nf3 0–0 11.0–0 h6 12.Nbd2 Bf5 13.Re1 Nbd7 14.Bf1 Bh7 (14...Rfe8 15.Ne4 Ne4 16.de4+=) 15.h3 Rae8 16.Ne4 Ne4 17.de4 Bd8 18.Bd3 Re6 19.Bc1 (19.Qc2!?+=) 19...Rfe8–/+ 20.Qc2 Qe7 21.Bd2 b6 22.e5 Bd3 23.Qd3 Bc7 (23...Ne5?! 24.Ne5 Re5 25.Re5 Qe5 26.Re1 Qe1 27.Be1 Re1 28.Kh2=) 24.Kf1 Be5 25.Re4 Qf6 26.Rae1 Bc7 (better is 26...Qg6 27.Qb3 R8e7–+) 27.Nh4? (better is 27.Re6 Re6 28.Re6 fe6 29.Qe4–/+) 27...Ne5–+ 28.Qe2 (28.Qc2 g5 29.Re5 Be5–+ (29...gh4?! 30.Re6 Re6 31.Re6 Qe6 32.Qd3+=)) 28...Nc4! 29.Re6 Nd2 (29...Nd2 30.Qd2 Re6–+; 29...fe6?! 30.Qc4 Qh4 31.Re6 Re6 32.Qe6 Kh8 33.Qe8 Kh7 34.Qf7–/+) 0–1. Rudd,David R (1900) – Rawlinson,Aidan (2235), BCF–chT2, 2009.

6.c4 d4 7.e4 Nf6+= 8.Qc2 Be6 (8...Be7 9.Nf3 Nbd7 10.Be2 0–0 11.Bc1 Qe6 12.d3 a4 13.0–0 Rd8=; 8...Nbd7 9.Be2 Be7 10.Nf3 0–0 11.0–0 Nh5 12.Bc1 f5 13.d3 fe4+=; 8...Bg4 9.Qd3 Be7 10.Be2 Be6 11.Nf3 Nh5 12.g3 Nd7 13.Qc2 Nhf6+=) 9.Nf3 Be7 10.Be2 0–0 11.0–0 Nh5 12.Bc1 d3 13.Qd3 Qd3 –/+.

6.c4 d4 7.e4 Nf6+= 8.d3 Be7 (8...Be6 9.Nf3 Be7 10.Be2 0–0 11.0–0 a4 12.Nbd2 h6 13.Rb1 Nbd7+=; 8...a4 9.Be2 Be7 10.Nf3 0–0 11.0–0 Rd8 12.Nbd2 Nbd7 13.Bc1 Nb6+=; 8...Nbd7 9.Nf3 Be7 10.Be2 0–0 11.0–0 Nb6 12.Bc1 a4 13.Nbd2 Re8+=) 9.Be2 (9.Nf3 0–0 10.Be2 a4 11.0–0 Nbd7 12.Nbd2 Nb6 13.Bc1 Be6+=) 9...0–0 (9...Nbd7 10.Nf3 0–0 11.0–0 a4 12.Nbd2 Nb6 13.Bc1 Be6+=) 10.Nf3 Rd8 (10...Nfd7 11.0–0 Qg6 12.Nbd2 Ra7 13.Rb1 b6=) 11.0–0 Nbd7 12.Qc2 (12.Nbd2 Nb6 13.Bc1 a4+=) 12...Nf8 (12...Nb6 13.Nbd2 Bg4+=) 13.Nbd2 (13.Bc1 Ne6+=) 13...Ng6 (13...Ne6+=) 14.g3 h6 15.Rfc1 Nh7 16.Bf1 Ng5 17.Bg2 Nh3 18.Kf1 h5 19.Ng1 Ng5 20.h4 Ne6 (20...Nh7!?+=) 21.Qd1+= Ngf4 (21...Bd7 22.Qh5 a4 23.Ngf3+=) 22.gf4+/– Nf4 23.Ndf3 f5 24.Ng5 (24.Ne2!? Ng2 25.Kg2 Qg6 26.Ng3+=) 24...Bg5+= 25.hg5 Qg6 26.Nf3 (better is 26.Bh1 Qg5 27.Rcb1=) 26...Ng2 27.Kg2 fe4 28.de4 Qe4 29.Rc3?? (better is 29.Kg1 Qg4 30.Kh1–+) 29...Bh3!! 30.Kh3 dc3 (30...dc3 31.Qh1 Rd3–+) 0–1. Kamaletdinov,Farit – Sokolov,Vladimir, 2011.

6.c4 d4 7.e4 Nf6+= 8.Qf3 a4 (8...Be6 9.Be2 Nbd7 10.Qd3 Rd8 11.Qc2 Be7 12.Nf3 0–0 13.Ng5 Bg4+=; 8...Be7 9.Be2 0–0 10.Qd3 Be6 11.Nf3 Nfd7 12.0–0 Nb6 13.Qc2 Rd8+=; 8...Ra7 9.Be2 Be7 10.Qg3 Nbd7 11.Nh3 Ne4 12.Qg7 Qf6 13.Qf6 Ndf6+=) 9.Be2 Be7 10.Qg3 Nbd7 11.Nh3 Ne4 12.Qg7 Qf6 13.Qg4 Nd6 –/+.

6.c4 d4 7.e4 Nf6+= 8.Nf3 a4 (8...Be7 9.Qc2 0–0 10.Be2 Bg4 11.0–0 Nbd7 12.h3 Bh5 13.d3 a4+=; 8...b6 9.Qc2 Be7 10.Be2 0–0 11.d3 Nfd7 12.0–0 Qg6 13.Nbd2 a4=; 8...Nbd7 9.Qc2 Be7 10.Be2 0–0 11.0–0 Nh5 12.Bc1 f5 13.d3 fe4+=) 9.Qc2 Be7 10.Be2 0–0 11.0–0 Nh5 12.Bc1 Nf4 13.d3 Qf6 +=.

6.bc6 bc6 7.d4 (7.Ne2 A) 7...Nf6 8.d4 (8.Ng3 Nbd7 9.Nc3 Rb8 10.Rb1+=) 8...Nbd7 9.Nd2 Be7 10.Ng3+=; B) 7...Be7 8.Ng3 (8.d4 Nd7 9.Ng3 Nh6 10.Nd2+=) 8...Nh6 9.Be2 Nf5 10.c4+=; C) 7...Nd7 8.Ng3 (8.d4 Nh6 9.Ng3 Be7 10.Nd2+=) 8...Nh6 9.Be2 Be7 10.0–0+=; 7.d3 A) 7...Nf6 8.Nf3 (8.Be2 Qc7 9.c4 dc4 10.d4+=) 8...Nbd7 9.Nbd2 Qc7 10.c4=; B) 7...Nd7 8.Nd2 (8.Nf3 Rb8 9.Bc3 a4 10.Be2+=) 8...Ngf6 9.Rb1 Be7 10.Ngf3+=; C) 7...Be7 8.Nd2 (8.d4 Nd7 9.de5 Ne5 10.Nd2+=) 8...Nf6 9.Ngf3 Nbd7 10.Rb1+=) 7...e4 (7...Nd7 8.de5 (8.Nd2 ed4 9.Bd4 Ngf6 10.c4=) 8...Ne5 9.Nd2 Rb8 10.Rb1=; 7...ed4 8.Bd4 (8.Qd4 Nf6 9.Nf3 Be7 10.Bd3=) 8...Nf6 9.Nf3 Be7 10.Bd3=) 8.c4 (8.Nd2 Nf6 9.Rb1 Qe6 10.Nb3+=) 8...Nf6 9.Nc3 (9.Qc2 Na6 10.Nd2+=) 9...Be7 10.cd5 (10.a4=) 10...cd5 11.Rc1 0–0 12.Qc2 Nbd7 13.Na4 Ba6 14.Ba6 Qa6 15.Nc5 Qb6 16.Nd7 Nd7 17.Ne2 Rab8 18.Bc3 Ba3 19.Ra1 Bd6 (19...Bb4 20.0–0–+) 20.0–0 Rfe8 (20...Ra8 21.Qa2 Qc6 22.Qa4 Qa4 23.Ra4–/+) 21.Rfc1 Rec8 22.Qa2 Rc4 23.Rcb1 (better is 23.Ba5 Qc6 24.Rc4 dc4 25.Nc3+=) 23...h6?? (23...Bb4 24.Bb4 ab4 25.Qb3–/+) 24.Nf4 Rc3?? 25.Nd5 Qd8?? 26.g3?? Ra3–+ 27.Qc4 Nb6 28.Nb6 Rb6 0–1. Kozlowski,Tomasz (1955) – Shishkin,Vadim (2455), Szachowe Lato Poznan Poland, 2011.

6.bc6 Nc6 7.Nc3 A) 7...Bf5 8.Nb5 (8.Nge2 Bg4 9.d4 e4 10.h3+=) 8...Qd7 9.Nf3 Rc8 10.Be2+=; B) 7...Be7 8.Nb5 (8.Rb1 Nf6 9.Nb5 Qb8 10.Nf3=) 8...Qb8 9.f4 Nf6 10.fe5+=; C) 7...Be6 8.Nf3 (8.Nb5 Qd7 9.Nf3 f6 10.d4+=) 8...f6 9.Nb5 Qd7 10.d4+=.

6.bc6 Nc6 7.c4 Nf6 8.Nc3 d4 (8...Bg4 9.Qb3 a4 10.Na4=+ (10.Qb7? Rb8 11.Qa6 Rb2–+)) 9.Nb5 Qd7 (9...Qd8 10.ed4 ed4 11.Nf3=) 10.Nf3+= Bc5 11.Ne5 Ne5 12.ed4 Bd4? (better 12...Nc4!? 13.Bc4 Be7+–) 13.Bd4+– (13.Nd4?! Qe7 14.Be2 Nd3 15.Kf1 Nb2=) 13...Nc6 14.Bc5 (better 14.Qe2 Kf8 15.Bf6 gf6 16.Qe3+–) 14...b6?? (better 14...Ra6+–) 15.Qe2 Kd8 (15...Ne7 16.Be7 Qe7 17.Nc7 Kf8 18.Qe7 Ke7 19.Na8 Re8 20.Nb6 Kd6 21.Be2 Bg4+–) 16.Bb6 (16.Bb6 Qc7 17.Bc7 Kd7 18.Qd3 Ke8 19.Bb6+–) 1–0. Pereira – Techno, internet, 2020.

6.bc6 Nc6 7.Nf3 A) 7...Nh6 8.Nc3 (8.Bb5 e4 9.Nd4 Be7 10.Nc3=) 8...Be7 9.Nb5 Qb8 10.d4=; B) 7...Bg4 8.h3 (8.Nc3 Rc8 9.h3 Bh5 10.Be2=) 8...Qh6 9.Rg1 Bf3 10.Qf3+=; C) 7...Nf6 8.Bb5 (8.Nc3 Be7 9.Nb5 Qb8 10.Be2=) 8...e4 9.Nd4 Be7 10.Be2=.

5.e3 Nf6

6.c4 Be7 7.Nf3 (7.d4 ed4 8.Qd4 c5=) 7...e4 8.Ne5 Nbd7 9.d4 ed3 10.Nd7 (10.Qd3 Ne5 Double attack (10...Ne5 Decoy); 10.Nd3 dc4 Deflection (10...dc4 Passed pawn); 10.Bd3 Ne5 Decoy) 10...Bd7 11.Qd3 0–0 (11...Be6 12.cd5 Qd5 13.Qd5 Bd5 14.Nc3=) 12.Nc3 c6 13.Rd1 Be6 14.cd5 cd5 (14...Nd5? 15.e4 Rad8 16.ed5 cd5 17.Be2+–) 15.Be2 Rad8 (15...Rac8 16.Qd4=) 16.0–0 (16.Qd4 Bf5+=) 16...Qe5 (16...Ng4 17.Bg4 Bg4 18.Rd2+=) 17.f4 (17.Na4 Qg5+=) 17...Qc7 (17...Qf5 18.Bf3 Qd3 19.Rd3=) 18.f5 (18.Rc1 Qd6+=) 18...Bc8= 19.Bf3 Bc5 (19...d4 20.Na4 de3 21.Qe3=) 20.Nd5 (20.Na4 Be7+/–) 20...Rd5= 21.Bd5 Ng4 22.g3 Ne3 23.Kh1 Nd5 24.Qd5 b6 25.Be5 Qa7 26.Rf3 Bb7 27.Qd3? (27.Qb3 Re8 28.Re1–+) 27...Re8 (27...Bf3?! 28.Qf3 Qe7 29.Bc3=) 28.Bf4 (28.Kg2 Qa8 (28...Bf3?! 29.Kf3 Qb7 30.Qd5–/+) 29.g4 Be4–+ (29...Bf3?! 30.Qf3 Qf3 31.Kf3 Re5 32.Rd8 Bf8 33.a4–+)) 28...Qa8 (28...Bf3 29.Qf3 Qe7 30.a4=) 29.Rdf1 Re1!! (29...Bf3?! 30.Qf3 Ba3 31.Qa8 Ra8 32.Be3+=) 30.Kg2 (30.Re1 Bf3 Mate attack) 30...Be4 31.Qc4 (31.Qc3 Rf1 32.Kf1 Bf3 33.Qe5–+) 31...Rf1 (better is 31...Bf3 32.Rf3 Rg1 33.Kh3 Qf3–+) 32.Qf1–/+ Bf5 (32...Ba3 33.g4 Bc5–/+ (33...Bf3?! 34.Qf3 Qf3 35.Kf3–/+)) 33.a4? (33.Qd1 Ba3 34.Be3 Bc5 35.Bc5 bc5–/+) 33...h5 (better is 33...Qe4!? 34.Qd1 Bg4–+) 34.h3–/+ Be4 35.Qd1 f6 36.Bc7? (36.Qb3 Kh8 37.g4 Qd8–/+ (37...Bf3?! 38.Qf3 Qg8 39.Be3–/+)) 36...Qd5 (36...Qb7 37.Bb6 Bb6 38.Qb3 Kh7–+) 37.Qd5–/+ Bd5 38.g4 h4 39.Bf4 g5 40.Bd2 (better is 40.Bc7!?–/+) 40...Kf7 (40...f5 41.gf5 g4 42.hg4 h3 43.Kg3–+) 41.Bc3 0–1. Berchtold – Bosboom,Manuel, ch Europe juniors, 1982.

6.c4 Bg4 7.Nf3 Nbd7 8.d4 e4 9.h3 Bh5 (worse 9...ef3 10.hg4 dc4 11.Qf3+–) 10.g4 Ng4 (worse 10...ef3 11.gh5 dc4 12.Nd2+–) 11.hg4 Bg4 12.Be2 ef3 13.Bf3 Bf3 14.Qf3 c6 15.bc6 (15.c5 Qf6 16.Ke2 h5=+) 15...bc6 16.Nc3 (16.cd5 cd5 17.Rh5 Rb8–/+) 16...Rb8–/+ 17.0–0–0 (17.c5 Qe6 18.Rb1 Be7–/+) 17...Rb2! 18.Kb2 Qa3 19.Kc2 Bb4 20.e4 dc4 21.Rb1 0–0 22.Rh3 Rd8 23.Qe2 Nb6 24.Qh5 h6 (24...Rd4?? 25.Qh7 Kf8 26.Qh8 Ke7 27.Nd5 Nd5 28.Qh4 Kd7 29.Ra3 Rd2 30.Kc1+–) 25.Rf3 Kh7 (25...Rd4?! 26.Qf7 Kh8 27.Qe8 Kh7 28.Rg3=) 26.Qf5 Kh8 27.Qf7?? (better 27.Rg3 Bc3 28.Rb6 Qa2 29.Kc3 Qa1 30.Rb2–+) 27...Rf8–+ 28.Qh5 Rf6 29.Qe8 Kh7 30.Rg3 Rf2 31.Kd1 g5 32.Rb4 Qb4 (32...ab4!? 33.Qe7 Kg6 34.Qe8 Kg7 35.Qe7 Rf7 36.Rg5 hg5 37.Qg5 Kh7 38.Qh4 Kg8 39.Qg5 Rg7 40.Qd8 Kf7 41.Qc7 Ke8 42.Qc6 Kf8 43.Qd6 Kg8 44.Qd8 Kh7 45.Qh4 Kg6 46.Qg3 Kf6 47.Qe5 Kf7 48.Qc7 Kf8 49.Qd6 Re7 50.Qf6 Ke8 51.Qg6 Kd7 52.Qf5 Kc6 53.Qf6 Kb7 54.Qe7 Ka6 55.Ne2–+) 33.Ke1 Rf6 34.e5 (34.Qe5 Qd6–+) 34...Qf8 35.Qf8 Rf8 36.Re3 a4 37.Ne4 (37.e6 Re8–+) 37...Kg6 38.Nc5 (38.e6 Ra8 39.Ra3 Kf5–+) 38...g4 39.e6 Nd5 40.Ra3 (40.Rg3 Kf5 41.Na4 Ra8–+) 40...c3 41.Ke2 (41.Ra2 g3 42.Na4 Rf3–+) 41...g3 42.e7 (42.Nd3 g2 43.Ra1 Kf5–+) 42...Re8 43.Nd3 (43.Kf3 Re7 44.Kg3 Re3 45.Kf2 c2 46.Re3 c1Q 47.Re6 Kf7–+) 43…Re7 (43...Re7 44.Ne5 Kf5–+) 0–1. bolaf (2115) – objorn (2420), gameknot.com, 2017.

6.d4 ed4 7.Bd4 Be7 8.Nf3 c5 (8...0–0 9.Bd3=) 9.Be5 Qd8 10.Bb2 (10.Be2 Be6=) 10...c4 (10...0–0 11.Nc3=) 11.Nc3 0–0 12.g3 (12.Be2 Be6=) 12...Be6 13.Bg2 Nbd7 14.0–0 Re8 15.Nd4 Nb6 Black intends a4 (15...Nc5 16.Qe2=) 16.Ne6 (16.Qd2 Bd6=) 16...fe6 17.Qd2 Bc5 18.Ne2 a4 19.Bd4 Qe7 20.Bc5 Qc5 21.Rfb1 (21.Qd4 Qd4 (21...Qb5? 22.Rab1 Qd7 23.Rb6+–) 22.ed4 e5=) 21...Kf7 (21...e5 22.Rb4+=) 22.h4 (22.Rb4 Rf8=) 22...g6 (22...Kg8 23.Rb4+=) 23.Qb4 Qb4 24.Rb4 h6 25.Rbb1 (25.Rd1 e5=) 25...g5 26.hg5 hg5 27.Rd1 Rad8 28.Nc3 g4 (28...e5 29.Rab1+=) 29.Rab1= e5 30.Rb4 Can d5 get defended? 30...Ke6 31.Ra1 (31.Kf1 Ra8+=) 31...Kd6 (31...Ra8 32.Rf1–/+) 32.Na4= Na4 33.Ra4 Kc5 34.Ra7 Kb6 35.Ra4 Ra8 (35...e4 36.Rb4=) 36.Ra8 Ra8 37.a4 Kc5 38.c3 Ne8 (38...e4 39.Kf1+=) 39.f3 (39.e4 Nc7 40.ed5 Nb5+=) 39...Nd6 40.fg4 e4 41.Bh3 (41.b6 Nb5+=) 41...Nb5 42.Rc1 Ra4 43.g5 Ra8 (43...Kd6 44.g6–/+) 44.Be6+= Nc3 (better is 44...Re8 45.Bf7 Re5+=) 45.Rc3+– b5 46.g6 b4 47.Rc1 Kd6 48.Bf7 b3 49.Rb1 Rc8 50.Rd1 b2 51.Bd5 b1R 52.Rb1 Kd5 53.Kf1 (53.g7 c3=) 53...c3+= 54.Ke2 c2 (better is 54...Ke5!?+=) 55.Rc1+= Rc7 56.Kd2 Rc6 57.g7 Rg6 58.Rg1 c1Q (58...Rg7 59.Kc2 Rc7 60.Kd2+=) 59.Kc1+/– Rg7 60.g4 Ke5 (60...Rg5 61.Kd2+=) 61.Kd2 Ra7 62.Rf1 Ra2 63.Ke1 Rg2 64.Rf5 Kd6 65.Rf4 Kd5 66.Kf1 Rh2 67.Rf2 (67.Rf5 Ke6+/–) 67...Rh4 68.g5 (68.Rg2+/–) 68...Rg4 (better is 68...Ke5!?+=) 69.Rg2+/– Rh4 70.g6 Rh8 71.Rg4 Ke5 72.Kf2 Kf6 73.Kg3 Kf5 74.g7 Rg8 75.Rf4 Kg5 76.Re4 Rg7 ½–½. Texel 1?05 64_bit 4CPU – Stockfish 6 64_bit 4CPU, CCRL, 2015.

6.d4 e4 7.c4 dc4 8.Nd2 Nbd7 (8...Be6 9.Qc2=) 9.Qc2 Nb6 (9...Qe6 10.Ne2=) 10.Nc4 Nc4 11.Bc4 Be6 (11...Be7 12.Ne2+=) 12.Ne2 (12.Be6 Qe6 13.Qc7 Qd5 14.Qe5 Kd7+=) 12...Bc4= 13.Qc4 Nd5 14.0–0 h5 (14...Be7 15.Nc3 Nc3 16.Bc3+=) 15.Rac1 Rh6 16.Nc3 Nc3 17.Rc3 c6 18.Rfc1 Be7 (18...Qd7 19.Qe2+=) 19.Qa4+– Qd7 20.bc6 Rc6 21.Rc6 bc6 22.Rc6 Rb8 23.Bc1 Ba3 24.Qc2 (24.Ba3?? Rb1 25.Bc1 Rc1 26.Rc1 Qa4–+) 24...Bb4 25.Qe4 Kf8 (25...Kd8 26.Bb2+–) 26.Qc2 Kg8 27.h3 Bf8 28.Rc4 Qb5 29.Bd2 (29.e4 Qb1+–) 29...Qb1 30.Qb1 Rb1 31.Kh2 Bd6 32.f4 Rb3 33.Kg1 Rd3 (33...h4 34.Ba5 Re3 35.Kf2+–) 34.Rc2 (34.Ba5!? Re3 35.Kf2+–) 34...a4+= 35.Kf2 f5 36.Ke2 Rb3 37.Rc6 Be7 38.d5 Kf7 39.d6 (39.Bc3 a3 40.Bd4 h4+–) 39...Bf6+= 40.d7 Ke7 41.Rc7 Rb2 42.Kd3 Rb3 43.Kc4 Ke6 44.Ra7 Rb1 45.Bb4 Rd1 46.Ra4 Rd7 47.Ra6 Kf7 48.Ra2 g6 49.Bc5 Rc7 50.Ra7 Ra7 51.Ba7 Ke6 52.Bb6 Bh4 53.Bc7 Bf2 54.Kd4 Bg1 55.Bd8 Bf2 56.Bg5 Bg1 57.Bh4 Bh2 (better 57...Kd6!?+–) 58.Bf2+– Kd6 59.h4 Ke6 60.g3 Kd6 61.e4 Ke6 62.e5 1–0. Adlai – Toffi, internet, 2021.

6.d4 e4 7.c4 Be7 8.Nc3 dc4 9.Bc4 Be6 10.Be6 Qe6 11.Nh3 0–0 12.Nf4 Qf5 13.f3 ef3 (13...Bd6 14.g4 Qd7 15.fe4 Bf4 16.ef4 Ng4 17.Qd3+–) 14.Qf3+= Qc2 15.Qe2 Qe2 16.Ke2 c6 17.e4 Nbd7 18.e5 Ng4 (18...Ne8 19.bc6 bc6 20.Rhb1=) 19.Kf3 Nge5 20.de5 Ne5 21.Ke2 (21.Kg3 g5 22.Nfe2 Rad8 23.bc6 bc6+=) 21...Nc4+= 22.Bc1 Bf6 23.Rb1 Nd6 (23...Bc3 24.bc6 Rad8 25.cb7 (worse 25.Rb7 Rfe8 26.Kf2 Bd4 27.Kg3 Rc8=+) 25...Rfe8 26.Kf3 Ne5 27.Kf2=) 24.Rd1+– Nf5 (24...Rfd8!? 25.bc6 Bc3+–) 25.bc6 bc6 26.Rd3 Rfe8 27.Kf3 Be5 28.Nce2 c5 29.Rb5 c4 30.Rd7 f6 31.Nd5 a4 (31...Reb8 32.a4+–) 32.Bf4 Nh4 (32...Rad8 33.Rd8 Rd8 34.Be5 fe5 35.Rc5+–) 33.Kf2 Rab8 (33...Bf4 34.Nef4 Rad8 35.Rd8 Rd8 36.Rc5+–) 34.Rb8 Rb8 35.Be5 fe5 36.Ne3 c3 37.Nc3 Rb3 (37...Rb2 38.Ne2+–) 38.Ne4 Ra3 (38...Rb2 39.Kf1 Rb1 40.Ke2 Kf8+–) 39.Ng5 Kf8 (39...Ra2 40.Kg3 Kf8 41.Kh4 Ke8 42.Rg7 Rd2 43.Rh7 a3+–) 40.Nd5 Ra2 (40...Ke8 41.Re7 Kf8 42.Ne6 Kg8 43.Rg7 Kh8 44.Nf6 Ra2 45.Kf1 Ra1 46.Ke2 Ra2 47.Kd3 e4 48.Kc3 Ra3 49.Kc4 Rc3 50.Kc3 Ng2 51.Rh7) 41.Kf1 Ra1 (41...Ke8 42.Re7 Kf8 43.Ne6 Kg8 44.Rg7 Kh8 45.Nf6 Ra1 46.Ke2 Ra2 47.Kd3 e4 48.Kc3 Ra3 49.Kc4 Rc3 50.Kc3 Ng2 51.Rh7) 42.Ke2 Ra2 (42...Ke8 43.Re7 Kf8 44.Ne6 Kg8 45.Rg7 Kh8 46.Nf6 Ra2 47.Kd3 e4 48.Kc3 Ra3 49.Kc4 Rc3 50.Kc3 Ng2 51.Rh7) 43.Kd3 Ra3 (43...e4 44.Kc3 Ke8 45.Re7 Kd8 46.Nf7 Kc8 47.Nb6 Kb8 48.Nd6 Ra3 49.Kc4 Rc3 50.Kc3 Ng2 51.Rb7) 44.Kc4 Rc3 (44...Ke8 45.Re7 Kf8 46.Ne6 Kg8 47.Rg7 Kh8 48.Nf6 Rc3 49.Kc3 Ng2 50.Rh7) 45.Kc3 (45.Kc3 Ke8 46.Re7 Kd8 47.Ne6 Kc8 48.Nb6 Kb8 49.Nc5 Ng2 50.Rb7) 1–0. marekt (2190) – gluv51 (2085), gameknot.com, 2017.

6.d4 e4 7.c4 Be7 8.Nc3 c6 9.Nge2 h5 (9...dc4!? 10.Ng3 cb5 11.Nb5 Qc6+=) 10.Rc1 dc4 11.bc6 bc6 (11...Qc6!? 12.d5 Qd7+=) 12.Ng3 h4 13.Nge4 Ne4 14.Ne4 Qg6 15.Nd2 Nd7 16.Nc4 Rb8 17.Qd3 Qe6 18.Qc3 Qd5 19.Nd2 Nf6 20.Qc6 (better is 20.f3!?+/–) 20...Qc6= 21.Rc6 Bd7 22.Rc2 Bf5 23.e4 Ne4 24.Bd3 Nf2 25.Bf5 (25.Kf2 Bd3) 25...Nh1 26.Nc4 0–0 27.Na5 Bd6 28.Nc6 Rbe8 29.Kd1 Bh2 30.d5 Bg3 31.Bd4 Re1 32.Kd2 Rfe8 33.Kd3 Bd6 34.Bd7 Rd1 35.Rd2 Rd2 36.Kd2 Re4 37.a4 Ng3 38.Kd3 Re2 39.a5 Ra2 (39...Rg2 40.a6–/+) 40.Bc8 Rg2 41.a6 Rb2?? (better is 41...Ra2 42.a7 f5=+) 42.Bb2+– (42...Bc5 43.d6+–) 1–0. Pierre (2140) – Bolodya, Rated game, 2005.

6.Nf3 e4 7.Nd4 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.Nf3 e4 5.Nd4 a5 6.b5 Nf6 7.e3).

6.Nf3 Be7 7.d4 (better 7.Be5!? Qd8 8.d4+–) 7...ed4 (7...e4 8.Ne5=) 8.Nd4 (8.Bd4 0–0=) 8...c5 (8...0–0 9.Bd3=) 9.bc6 Nc6 (9...bc6 10.c4=) 10.Bb5 (10.Be2 0–0=) 10...0–0 11.c4 (11.0–0 Bd7=) 11...dc4=+ 12.Bc4 Nd4 13.Qd4 Qc6 14.0–0 Rd8 15.Qc3 (15.Qe5 Qc4 16.Qe7 Be6=+) 15...Be6 16.Be6 Qe6 17.Nd2? (better 17.Re1=+) 17...Rac8–+ 18.Qa5 b6 19.Qe5 Rd2 20.Qe6 (20.Rfd1 Re2 21.Qe6 fe6–+) 20...fe6 21.Bd4 Nd5 0–1. carlog (1845) – qphys8 (2025), gameknot.com, 2017.

5.Nf3 f6

6.d4 e4 7.Nfd2 Be6 8.e3 Nd7 9.c4 =.

6.d4 e4 7.Nfd2 Be6 8.e3 f5 9.c4 Nf6 10.Nc3 Be7 11.cd5 Nd5 12.Nc4 Qd8 13.Ne5 Nc3 14.Bc3 0–0 15.Qa4 Nd7 (15...Bd6 16.Bc4 (< 16.Ba5 Kh8–+) 16...Qe7 17.Be6 (< 17.Ba5 Be5 18.de5 Qf7–/+) 17...Qe6 18.Qc4=) 16.Bc4 Ne5 (16...Rf6 17.Be6 Re6 18.Qb3+=) 17.Be6+/– (17.de5?! Bc4 18.Qc4 Kh8=) 17...Nf7 18.Qc4 g6 19.d5 h6?? (better is 19...Bf6+/–) 20.Qd4+– Bf6 21.Qf6 Qf6 22.Bf6 Kh7 (22...a4 23.Ke2 Ra5 24.Rab1+–) 23.Rc1 (23...c6 24.bc6 bc6 25.dc6+–) 1–0. Trigance,Eric – Manninen,Juha, corr ICCF TT–4–90 SF, 1995.

6.d4 e4 7.Nfd2 Be6 8.e3 f5 9.c4 Nf6 10.Nc3 Be7 11.cd5 Nd5 12.Nc4 Qd8 13.Qh5 g6 14.Qh3 Bg8 =.

6.d4 e4 7.Nfd2 Be6 8.e3 f5 9.c4 Nf6 10.c5 Qd7 =.

6.e3 c5 7.c4 Be6 8.cd5 Bd5 9.Nc3 Bf7 (9...Ne7 10.Bd3+–) 10.Qc2 (10.Nh4 Ne7+–) 10...Nd7+– 11.Rc1 (11.Bd3 c4 12.Be2 Nc5+=) 11...b6 (11...Nh6 12.Bd3+–) 12.Bd3 (12.Qe4 Rd8+–) 12...Ne7 (better 12...Bb3!? 13.Qb1 g6+–) 13.Ne4+– (13.Bh7 g6 14.Qe4 Qb8 15.Bg6 Bg6–+) 13...Qe6 (13...Qc7 14.Bc4 Bh5 15.0–0+–) 14.Bc4 Qc4?? (14...Nd5+–) 15.Nd6 (15.Qc4?! Bc4 16.Nd6 Kd8 17.Rc4 Rg8+=) 15...Kd8 16.Nc4 (16.Qc4?! Bc4 17.Rc4 Rg8+=) 1–0. Janek – Klenes, internet, 2017.

6.e3= c5 7.d4 cd4 8.ed4 +=.

6.e3= c5 7.d4 Nd7 8.c4 (8.de5 fe5 (< 8...Ne5 9.Ne5 fe5 10.Qh5 Kd7 11.Be5+/–) 9.c4 d4=) 8...cd4 (8...ed4 9.ed4 Ne7 10.Nbd2+=) 9.ed4+= ed4 10.Qd4 (10.Bd4 Qe7 11.Be3 dc4 12.Bc4 Nb6+/–) 10...Nb6= 11.cd5 Nd5 12.Bc4 Be6 13.0–0 Rd8 14.Re1 Kf7 (14...Nge7 15.Nc3 Nc3 16.Qc3 (16.Be6? Qd4 17.Nd4 Na4–+) 16...Bc4 17.Qc4+/–) 15.Nc3 Nc7 16.Be6 Ne6 17.Qc4 (17.Qa7 Qc7 18.b6 Qc6 19.Qa5 Bc5+–) 17...Re8 (better is 17...Qb6!?+/–) 18.Ne4 Qd8?? (better is 18...Qb6+–) 19.Rad1 (19.Neg5 Kg6 20.Qc2 Kh5 21.Ne6 Qc8 22.Qf5 g5 23.Bf6 Qc1 24.g4 Kh6 25.Bg5 Qg5 26.Qg5) 19...Qc8 20.Neg5! fg5 21.Ng5 Kg6 22.Qe4 (< 22.Re6 Nf6 23.Qd3 Kh5+–) 22...Kg5 (22...Kh5 23.Ne6 Qe6 24.Rd5 g5 25.Qf3 Qg4 26.Qf7 Kh4 27.Qe8 Nf6 28.Bf6 Bh6 29.Qh8 Kh5 30.Bg5 Qh4 31.Qe8 Kg4 32.Re4) 23.Rd5 Kh6 24.Qh4 (24...Kg6 25.Qh5#) 1–0. Labahn,Wolfgang – Bakalarz,Leszek (2210), Beskidy–Open, 1991.

6.e3= Nh6 7.c4 (7.Nc3 Bf5=) 7...c6 (7...e4 8.Nd4 c5 9.bc6 bc6 10.Nc3+=) 8.cd5 (8.d4 ed4 9.Bd4 c5+=) 8...cd5 9.d3 (9.Nc3 Be7=) 9...Be7 10.Be2 0–0 11.0–0 Be6 12.Nc3 Nd7 13.Rc1 f5 14.d4 (14.Qc2 f4=) 14...e4 15.Nd2 (15.Ne5 Ne5 16.de5 Qe5=) 15...f4 16.ef4 (16.Nb3 a4 17.Nc5 fe3 (< 17...Nc5 18.dc5 Qc5 19.Ne4=) 18.Ne6 ef2 19.Kh1 Qe6 20.Nd5 Ra7= (20...Qd5? 21.Bc4 Nb6 22.Bd5 Nd5 23.Qc2+–)) 16...Qf4 17.Nb3 Ng4 (17...Bd6 18.g3 Qf6 19.Nc5 Nc5 20.dc5 Bc5 21.Ne4 Bf2 22.Rf2 Qb2 23.Bg4 Rf2 24.Be6 Rf7 25.Bd5 Qa3 26.Qd2–/+) 18.g3 Qg5 19.Nd5 Bd5 20.Bg4= Nf6 21.Bh3 Qh6 22.Bg2 Kh8 23.Rc3 Bd6 24.Re1 b6 25.Qc1 Qh5= 26.h3 Qf5 27.Nd2 Ng4?? 28.hg4+– Qf2 29.Kh1 e3 30.Ne4 Be4 31.Be4 Qg3 32.Re2 Rf2 33.Rc8 Rc8 34.Qc8 Bf8 (better is 34...Rf8 35.Qf8 Bf8–+) ½–½. Machete99 (2195) – Crayon (2190), ICC, 2002.

4.Nc3 c6

5.ba5 Bf5 6.e3 (6.d3 Nf6 7.Nf3 Ra5 8.Qd2 b6 9.Nd1 Nbd7 10.Ne3 Bg6 11.c4 e5=; 6.Nf3 Ra5 (6...e5 7.Na4 f6 8.d4 e4 9.Nh4 Be6 10.Bc3 Qc7 11.Nb6 Ra7=; 6...Nf6 7.Nd4 Bg6 8.Nb3 e5 9.e3 Be7 10.Be2 Nbd7 11.0–0 Nc5=) 7.Nd4 Bg6 8.Nb3 Ra8 9.e3 e5 10.Be2 Bf5 11.0–0 Qg6=) 6...e5 (6...Ra5 7.f4 d4 8.ed4 Qf4 9.Nf3 Nf6 10.Bc4 e6 11.Ne2 Qg4=) 7.Nf3 (7.Nce2 Ra5 8.d4 e4 9.Ng3 Be6 10.c4 b6 11.cd5 Bd5=) 7...Nd7 (7...Ra5 8.Ne2 Nd7 9.Ng3 Bg4 10.d4 ed4 11.Qd2 Ra4=) 8.a4 (8.a6 b5 9.a4 b4 10.Ne2 Bg4 11.Ng3 Be7=) 8...Qc7 (8...Ra5 9.d4 e4 10.Ba3 Qc7 11.Bf8 Nf8+=) 9.a6 b6 (9...ba6 10.Rb1 Bd6 11.Be2 Ngf6+=) 10.Be2 Bd6 11.Nh4 (11.Ba3 Ngf6=) 11...Bg6 (11...Be6=) 12.f4 Ne7 13.g3 ef4 14.ef4 d4 15.Ng6 hg6 16.Ne4 Nf5 17.Nd6 Qd6 18.Ba3 Qe6 19.Kf2 0–0–0 20.Bf3 Qf6 21.Qf1 g5 22.Re1 gf4 23.Qg2 (23.g4 Qh4 24.Kg1+=) 23...fg3 24.hg3 Rh1 25.Qh1 Ne5 26.Re4 g5 27.a7 Kb7 28.Re5 Qe5 29.Bc6 Ka7 30.Qe4?? (better is 30.Qf3–+) 30...Qg3 31.Ke2 (31.Kf1 Qa3 32.Qf5 Qc1 33.Kg2 Qd2 34.Kf1–+) 31...d3! (31...Qa3?! 32.Qf5 Qe7 33.Kd1–+) 32.cd3 Nd4 (32...Nd4 33.Kd1 Qg1 34.Qe1 Qg4 35.Kc1 Nc6–+) 0–1. Ouerghi,Rida – Figier,Anthony (1780), Marseille FRA, 4th Open, 2011.

5.b5 d4 6.Ne4 Qd5 7.Ng3 cb5 8.Nf3 Nc6 9.e4 Qc5 10.a4 (10.c3!? dc3 11.Bc3=) 10...ba4+= 11.Ba3 Qb6 12.Rb1 Qc7 13.Bb5 e5 14.Bf8 Kf8 15.Ba4 Bg4 16.0–0 Nge7 17.h3 Bd7 18.c3 dc3 19.dc3 Be6 20.Qc2 Bc4 21.Rfd1 Rd8 22.Bc6 Nc6 23.Rd8 Nd8 24.Qd2 f6 25.Nf5 Kg8 26.Rd1 (26.Ne3 Be6=) 26...Nf7+= 27.Qd7 Qd7 28.Rd7 g6 29.Ne3 Ba6 30.Nc2 (better is 30.Nd5!? Kg7 31.g4–/+) 30...Kg7–+ 31.Ne3 a4 32.Rd1 Be2 33.Ra1 Bf3 34.gf3 Ra8 35.Nd5 Nd6 36.Kf1 a3 37.Ke2 Nc4 38.Kd3 b5 39.Nc7 (39.Kc2 Ra7–+) 39...Rd8 40.Nd5 f5 41.h4 Kh6 42.Kc2 fe4 43.fe4 Rf8 44.Rf1 (44.f4–+) 44...a2 45.Kb3 (45.f4 ef4 46.Ra1–+) 45...Rf2!! 46.Rf2 a1Q (46...a1Q 47.Kb4 Qa4 48.Kc5 Qa7 49.Kb5 Nd6 50.Kc6 Ne4–+) 0–1. Hal1958 – Trousersnake, playchess.de, 2002.

4.Nc3 e5

5.d4 e4+= 6.b5 c6 (6...Nf6 7.e3+=) 7.e3 Nf6 8.Nge2 Ng4 9.h3 Nh2 10.bc6 bc6 (10...Nf1?! 11.cb7 Bb7 12.Rf1=) 11.a4 Nf1 12.Kf1 Na6 13.Ba3 Nb4 14.Rb1 Rb8 (better is 14...Qf6–/+) 15.Ne4? (better is 15.Na2! Ba6 16.Nac1+=) 15...de4–/+ 16.c3 c5 17.cb4 cb4 18.Bb2 Ba6 19.Rc1 Be7 20.d5 Rd8 21.Bg7 Rg8 22.Bd4 Qd5 23.Kg1 Bd6 24.Qc2 f5 25.g3 (25.Re1 Rg6–+) 25...f4! 26.ef4 (26.Nf4 Bf4 Combination; 26.ef4 Be2 Decoy) 26...b3 27.Qb2 Be2 28.Qe2 Qd4 29.Kg2 e3 (29...Kf8!? 30.Rc4 Qd3 31.Qe4 Qe4 32.Re4–+) 30.Qe3 Qe3 31.fe3 Rb8 32.Rc3 Rg7 33.Rb1 Rgb7 34.e4 Bf8 35.Rb2 Rb4 36.Kf3 Ra4 37.Rbb3 Rb3 38.Rb3 Rb4 39.Rc3 a4 40.Rc8 Kf7 41.e5 Rb3 42.Kg4 Re3 43.Rc7 Be7 44.h4 a3 45.Ra7 h5! 46.Kf5 Rg3 47.Ke4 Rg4 48.Kf5 Rg6 49.Ke4–/+ Rg1 50.f5 Ra1 51.f6 a2 52.Re7 Kf8 53.Ra7 Re1 54.Kf5 a1Q 55.Ra1 Ra1 56.Kg6 Re1 0–1. Idelis – Skrotwm, playchess.de, 2004.

5.e3 c6 6.Nce2 Nf6 7.Nf3 e4 8.Nfd4 ab4 (8...Be7 9.Nf4=) 9.ab4 Ra1 10.Qa1 Qb4 11.Ng3 Qb6 (11...Nbd7 12.Be2=) 12.Be2+= c5 13.Ndf5 h5 14.h4 Nbd7 15.0–0 g6 16.Rb1?? (better 16.Qa8 Kd8 17.Bc3+=) 16...gf5–+ 17.Bc3 Qd8 18.Ba5 b6 19.Rb6 Nb6 20.Bb5 Bd7 21.Qe5 Be7 22.Nf5 Kf8 (worse 22...Bb5 23.Bb6 Qd7 24.Bc5+–) 23.Bb6 Qe8 (23...Bb5?? 24.Bd8 Bd8 25.Qd6 Kg8 26.Qd8 Ne8 27.Nd6+–; 23...Qb6 24.Qe7 Kg8 25.Bd7 Qb1 26.Kh2 Ng4 27.Kg3 Qb8 28.f4 ef3 29.Kf3+=) 24.Bd7 Qd7 25.Ne7 Qe7 26.Bc5 Qc5 27.Qf6 Rh7 ½–½. ilbepi (2210) – bolaf (2080), gameknot.com, 2017.

5.e3 Nc6+=.

5.e3 Be7?? 6.Nb5+– (6.Nb5 Qd8 7.Be5+–) 1–0. gluv51 (2075) – kingsrook3 (1860), gameknot.com, 2017.

5.e3 Nf6 6.Nf3 c6 7.Be2 e4 8.Nd4 Qd8 (8...ab4 9.ab4 Ra1 10.Qa1 Qb4 11.0–0=) 9.0–0 (9.ba5 Bd6+=) 9...ab4= 10.ab4 Ra1 11.Qa1 Bb4 12.Ba3 (12.Rb1 0–0=) 12...Ba3 13.Qa3 Qe7 14.Qa5 Nbd7 15.Nf5 Qe5 16.Nd4 (16.Ng7? Kf8 17.f4 ef3 18.Rf3 Kg7 19.Rg3 Kf8 20.Qd8 Qe8–+) 16...0–0 17.Qa3 Re8 18.h3 Qg5 19.Qd6 Ne5 20.Kh2 g6 21.d3 (21.Qc7 Kg7=+) 21...Kg7 22.Rb1 h5 23.de4 (23.Kh1 b5=+) 23...de4 (23...Ne4 24.Ne4 de4 25.Nb3=+) 24.Qc7 Attacking the backward pawn on b7 (24.Ra1 b5=+) 24...Ned7 25.Na4 Qe5 26.Qe5 Re5 27.Nb2 Nb6 28.Nd1 Nbd5 29.c4 Nc7 30.Ra1 h4 31.g3 hg3 32.fg3 Nd7 33.Nc3 Nc5 34.g4 Nd3 35.Nb3 Na6 36.Kg3 Re8 37.g5 (37.h4 Re5=+) 37...f5 (37...Re5 38.h4–/+) 38.gf6=+ Kf6 39.Rf1 Ke5 40.Nd4 Nac5 41.Ra1 Rh8 42.h4 Bd7 43.Ra5 (43.Rf1 Ra8–/+) 43...Kd6 (43...b6 44.Ra1–+) 44.Ra3 Nc1 45.Bf1 N1d3 46.Ra7 (46.Be2 Rf8 47.Ra1–/+) 46...g5!–/+ 47.hg5 Rh5 48.Rb7 Rg5 (48...Nb7?! 49.Ne4 Ke7 50.Bd3=) 49.Kh2 Nf2 (worse 49...Nb7 50.Ne4 Ke7 51.Ng5+=) 50.Rb6 (50.Rb8 Ng4 51.Kg3 Rg6–/+) 50...Ng4–+ 51.Kg3 Rg6 (51...Ne3?! 52.Kf4 Rg1 53.Ncb5 Ke7 54.Nc6 Bc6 55.Rc6 Nf1 56.Rc5=) 52.Be2 Ne3 53.Kf2 Ng2 54.Bf1 Ke5 (better 54...Nd3!? 55.Bd3 ed3=+) 55.Nc6=+ Bc6 56.Bg2 e3 57.Ke3 Rg3 58.Bf3 Rf3 59.Ke2 Rf6 60.Ke3 Rh6 61.Nd5 Rg6 62.Nc3 (62.Ne7 Rg3 63.Kf2 Ne4 64.Ke2 Bd7–/+) 62...Rg3–/+ 63.Kf2 Rg2 64.Ke3 Bd7 65.Rh6 Rg3 66.Kd2 Nb3 67.Kc2 Na5 68.Kb2 Nc4 69.Kb3 Ne3 70.Rh5 Bf5 71.Nb5 Rg8 72.Ka4 Rb8 73.Nc3 (better 73.Rg5!?–/+) 73...Kd4–+ 74.Nb5 Kc5 75.Na3 Rb4 (75...Rb4 76.Ka5 Rf4–+) 0–1. ilbepi (2195) – objorn (2395), gameknot.com, 2017.

4.c4 dc4

5.Nc3 Nf6 6.b5 Nbd7 7.e3 Ne5 8.f4 Nd3 9.Bd3 Qd3 10.Nf3–/+.

5.Nc3 Nf6 6.b5 e5 7.Rc1 (7.Nf3 e4 8.Ng5 Qe5–/+) 7...Be6 (7...Nbd7 8.e3 Nc5 9.Nf3–/+) 8.Nf3 Nbd7 9.e3 Rd8 (9...h6 10.Na4=+) 10.Na4 c6 11.bc6 (11.Bc4?? Bc4 12.bc6 Qc6–+) 11...Qc6 12.Be5 Ba3 (worse 12...Ne5 13.Ne5 Qc7 14.Nc4+=) 13.Nd4 Qa6 14.Bf6 Nf6 15.Ne6 fe6 (15...Qe6 16.Rc4 0–0 17.Nc5–/+) 16.Rc4=+ b5 17.Rd4 Rd4 18.ed4 Qc6 19.Nc3 0–0 20.Nb5 Bb4 21.f3 Rb8 22.Qe2 Qc1 23.Kf2 a4 24.Qe1 Qc2 (24...Qd2?! 25.Qd2 Bd2 26.Bc4=) 25.Qe6 Kh8 26.Be2 Re8 27.Qc4 Qd2 28.Ra1 Nd5 29.g3 (29.Qd5 Qe3 Double attack (29...Qe2 Deflection)) 29...Bc3 30.Rd1 (30.Nc3?? Nc3 31.Kf1 a3–+ (31...Qe2?! 32.Qe2 Re2 33.Ra4–/+; 31...Ne2?! 32.Qa4 Qe3 33.Kg2–+)) 30...Qe3 31.Kf1 Qe7 32.Kf2 a3 33.Na3 (33.Nc3?? Nc3 34.Re1 Qe3 35.Kg2 Ne2–+) 33...Ne3 34.Qb5 Nd1 35.Bd1 Bd4 36.Kg2 Rd8 37.Nb1 Qe1 38.Qe2 Re8 39.Qd3 Qf2 40.Kh3 Re1 41.Qf5 (41.Bc2 g6 42.Qc4 Re5–+) 41...Qf1 42.Kg4 Re8 (42...Re8 43.Bc2 g6–+) 0–1. marekt (2175) – objorn (2435), gameknot.com, 2017.

5.Nc3 Nf6 6.b5 Be6 7.Nf3 Nbd7 8.Na4 Bd5 9.e3 0–0–0 (better 9...e5!?–/+) 10.Rc1= e5 11.Bc4 e4 12.Bf6 Nf6 (worse 12...gf6 13.Bd5 Qd5 14.Qc2+–) 13.Nd4 Bc4 (13...Kb8 14.0–0=) 14.Rc4 Qa3 15.0–0 Kb8 (15...Bb4 16.Qc2 Nd5 17.f3 Bd2 18.Nb6 (18.Qd2 Ne3 19.Rc7 Kc7 20.Qa5 Kd6 21.Qb6 Ke7 22.Qc7 Ke8=+) 18...Nb6 19.Rc7 Kb8 20.Rb7 Kb7 21.Qc6 Ka7 22.Qc7 Ka8 23.Qc6 Kb8 24.Qb6 Kc8 25.Qc6 Kb8 26.Qb6 Kc8 27.Qc6 Kb8 28.Qb6=) 16.Nc3 Bb4 (16...Qd6!?=) 17.Qb1+– Bc3 18.Rc3 Qd6 19.Nc6 Kc8 (19...bc6?? 20.bc6 Qb4 21.Rb3+–) 20.Nd8 Rd8 21.b6 c6 22.d4 ed3 (22...Ng4 23.g3 Nf6 24.Rc5+–) 23.Rd1 d2 (23...Qe6 24.Rcd3 Rd3 25.Qd3+– (25.Rd3?! Qe4+–)) 24.Qf5+– Nd7 (better 24...Rd7 25.Qa5 Ng4+–) 25.Qa5 Qg6 26.h3 Nb8 27.Qa2 Qe6 (27...Na6 28.Rc2 (28.Rd2?! Rd2 29.Qd2 Qb1 30.Rc1 Qb6+–) 28...c5 29.Rcd2 Rd2 30.Rd2 Qb6 31.Qf7+–) 28.Qa4 Rd5 (28...Nd7 29.Qb4 Ne5 30.Qa5+–) 29.Rc2 Nd7 30.Qa8 Nb8 31.Rcd2 Rd2 32.Rd2 Qe7 (32...c5 33.Qa1 Qf6 34.Qa4+–) 33.Qa1 Nd7 34.Qg7 Nb6 35.Qh7 Nc4 (35...Kc7 36.Qf5 Nd5 37.e4+–) 36.Qf5 Qe6 (36...Kc7 37.Qf4 Ne5 38.h4+–) 37.Qe6 fe6 38.Rd1 b5 (38...Nb2 39.h4 Nc4 40.h5+–) 39.h4 1–0. marekt (2145) – bolaf (2015), gameknot.com, 2017.

5.Nc3 Nf6 6.e3 Be6 7.Nf3 c6 8.Ng5 Nbd7 9.Ne6 Qe6 10.f4 g6 11.Be2 Bg7 12.Qc2 ab4 13.ab4 Ra1 14.Ba1 b5 15.e4 0–0 16.0–0 Ra8 17.Bf3 Nb6 18.Bb2 Qd7 19.Ra1? Ra1–+ 20.Ba1 Qa7 21.Qa2–/+ Qa2 22.Na2 Nfd7 23.Bg7 Kg7 24.e5 Nb8 25.Kf2 e6 26.Ke3 Nd5 27.Bd5 cd5 28.Nc3 Nc6 29.Nb5 Nb4 30.g3 Nd3 31.Nd4 g5 32.f5 Ne5 33.fe6 Kf6 34.ef7 Kf7 35.h3 Kf6 36.Ke2 Nd3 37.Ke3 Nc5 38.Ne2 Ke5 39.Nd4 Ne6 40.Nf3 Kf5 41.d3 g4 42.hg4–/+ Kg4 43.dc4 dc4 44.Ne5 Kg3 45.Nc4 h5 46.Nd6 Ng7 47.Ne4 Kg2 48.Ng5 Ne8 49.Kf4 Nf6 50.Nf3 Nd5 51.Kg5 Kf3 52.Kh5 ½–½. Hein,Andreas (2300) – Dreyer,Michael (2210), Schleswig Holstein–ch masters, 1998.

4.e3 ab4

5.ab4 Ra1 6.Ba1 Qb4 7.Nf3 Nd7 8.Be2 Ngf6 9.0–0 e6 10.d4 Be7 11.Bc3 Qa4 12.Bb2 Nb6 13.Nc3 (13.Ne5 Qa2 14.Qc1 Na4=+) 13...Qb4–/+ 14.Qa1 0–0 15.Ne5 (15.Rb1 Bd7 16.Bc1 Ra8 17.Qa8 Na8 18.Rb4 Bb4–/+) 15...Bd7–/+ 16.Nd3 (16.Qa2 Ra8 17.Qb3 Be8–/+) 16...Qd6 17.Bc1 Nc4 18.Ne5 (18.e4!? de4 19.Nc5–/+) 18...Ne5–+ 19.de5 Qe5 20.Bb2 Bd6 21.g3 Qg5 (21...Qf5 22.Nb5–+) 22.Qd1 (22.Qa2 Qf5–+) 22...Ra8 23.Qd3 c6 24.e4 b5 25.f4 Qg6 26.Kg2 Bb4 (better 26...b4!? 27.f5 ef5 28.ef5 Bf5 29.Qf5 Qf5 30.Rf5 bc3 31.Bc3–+) 27.f5–/+ Qh6 28.Bc1 g5 29.ed5 ed5 (better 29...ef5!? 30.h4 Qg6 31.hg5 Bc3 32.gf6 Qf6–/+) 30.h4–/+ Qg7 31.hg5 Ne8 (31...Bc3 32.Qc3 Ne4 33.Qg7 Kg7 34.Bd3=+) 32.f6= Qg6 33.Qd1 Bf5 (worse 33...Bc3 34.Bd3+–) 34.Rf5 Qf5 (34...Bc3 35.Rf4 Ng7 36.fg7 Qg7 37.Bd3+–) 35.Bd3 Qe5 36.Qh1 h5?? (better 36...Nf6 37.gf6 h5+= (37...Bc3?? 38.Qh7 Kf8 39.Qh8; 37...Qc3?? 38.Qh7 Kf8 39.Qh8)) 37.Bf4+– Qc3 38.Qh5 Nf6 (38...Qd3 39.cd3 Ra2 40.Kh3 Ra1+–) 39.gf6 Qf6 40.Be5 Qe5 41.Qe5 Bf8 (41...Bd2 42.Qc7 Bg5 43.Qc6+–) 42.Qc7 c5 (42...b4 43.Qc6 Rd8 44.Qf6+–) 43.Qd7 Ra1 44.Bb5 Ra5 (44...Rb1+–) 45.Be2 Ra2 46.Bh5 Rc2 47.Kf3 Rc1 (47...Kh8 48.Qf7 Rc3 49.Kg4 Bg7 50.Bg6 Rc4 51.Kh3 Re4 52.Qd7 Rh4 53.gh4 Kg8 54.Qf7 Kh8 55.Qe8 Bf8 56.Qf8) 48.Qf7 Kh8 49.Qf8 Kh7 50.Qf7 (50.Qf7 Kh8 51.Qf6 Kh7 52.Bg6 Kg8 53.Qf7 Kh8 54.Qh7) 1–0. bolaf (2080) – gluv51 (2090), gameknot.com, 2017.

5.ab4 Ra1 6.Ba1 Qb4 7.Nf3 e6 8.Be2 Nf6 9.0–0 Bd6 10.d4 (10.Bc3 Qb6=+) 10...Qa5 11.Nbd2 Qa8 12.c4 c6 13.Qb3 0–0 14.Bc3 Nbd7 15.Ra1 Qb8 16.c5 Ne4?? (better 16...Bc7=) 17.cd6+– Nd2 (better 17...Nc3 18.Qc3 Qd6+–) 18.Nd2 Qd6 19.Bb4 c5 20.dc5 Nc5 21.Qa3 b6 22.Rc1 (22.Nb3 Re8+–) 22...Rd8 23.Bc5 bc5 24.Qc5 Qe5?? (24...Qc5 25.Rc5 e5+–) 25.Qc8 Qb8 26.Qb8 Rb8 27.Nf3 h6 28.g4 Rb2 (28...Rb7 29.Rc8 Kh7 30.Bd3 g6 31.Ne5+–) 29.Bd3 (better 29.Rc8 Kh7 30.Bd3 g6+–) 29...f6 (29...g6 30.Rc7+–) 30.Bg6 Rb8 31.Rc7 e5 32.Bf7 (32.Nh4!? Kh8+–) 32...Kh7 33.Bd5 Kg6 (33...Rb1 34.Kg2 Rb4 35.e4+–) 34.Be4 f5 35.Bf5 (35.Ne5 Kf6 36.Nd7 Ke6 37.Nb8 fe4 38.Rg7 Kf6+–) 35...Kf6 36.Nd2 e4 37.Ne4 Ke5 38.Rd7 (38.Rc5) 38...Rb5 39.f4 1–0. BeepBeepImAJeep (2560) – agrzelak (2180), lichess.org, 2017.

5.ab4 Ra1 6.Ba1 Qb4 7.Nf3 f6 8.Be2 e5 9.0–0 Qd6 10.d4 Nc6 11.c4 e4 12.Nfd2 dc4 (12...f5 13.Nc3=) 13.Nc4 Qe6?? (better 13...Qe7=) 14.d5+– Qd7 15.dc6 Qc6 16.Nc3 Be6 17.Nd2 f5 (17...Qd7 18.Nce4 Be7+–) 18.Bb5 (18.Bb5 Bd7 19.Bc6 Bc6 20.Qh5 g6 21.Qd1+–) 1–0. BeepBeepImAJeep (2725) – Totornator (2315), lichess.org, 2017.

4.Nf3 ab4

5.ab4 Ra1 6.Ba1 Qb4 7.e3 (7.Be5 Qa5 8.Bc3) 7...Bg4 (7...Nd7 8.Be2) 8.Be5+= (8.Nc3).

5.ab4 Ra1 6.Ba1 Nf6 7.e3 (7.Be5 Qd8=) 7...g6 (7...Qb4!? 8.Bc3 Qb6=+) 8.b5 Bg7 9.Be2 (9.Be5 Qc5+=) 9...0–0 10.c4 Ne4 (10...dc4!? 11.Bc4 Bf5=) 11.Bg7+= Kg7 12.0–0 dc4 13.Bc4 c6 14.d3 Nf6 15.d4 cb5 16.Bb5 Bd7 17.Bd3 Bc6 18.Nbd2 Nbd7 19.Nc4 Qc7 20.Nce5 Ne5 21.Ne5 (worse 21.de5 Ng4=) 21...Nd5 22.Qa1 f6 23.Nc4 Rc8 24.Rc1 Qd7 25.Bf1 Kf7? (better 25...b5!? 26.Na5 Ra8+=) 26.e4+– Nf4 27.Nb6 (better 27.Qa2 Qe6 28.d5 Nd5 29.ed5 Bd5 30.Qb3+–) 27...Qe6?? (better 27...Qg4 28.Qb2 Rb8+–) 28.Bc4+– Ne2 (28...Bd5 29.Nd5 Rc4 30.Rc4 Nd5 31.ed5 Qd5+–) 29.Be2 Qe4 Threatening mate: Qxg2 30.Bf3 Qf4 31.Nc8 Bf3 32.gf3 Qf3 (32...Qg5 33.Kh1 Qd5 34.Qa3+–) 33.Qc3 (better 33.Qa2!? Kg7 34.Qe6 Kh6+–) 33...Qg4 34.Kh1 Qe4 (34...Qd7 35.Qc4 Kg7 36.Qc5+–) 35.f3 Qe2 36.Qc4 (better 36.Re1!? Qf2+–) 36...Qc4 37.Rc4 (37.Rc4 Ke6 38.Rc7+–) 1–0. BeepBeepImAJeep (2560) – fluorouracil (2135), lichess.org, 2018.

5.e3 Nd7=+ 6.Be2 e6 7.0–0 Ngf6 8.Nd4 (8.g3 Be7=+) 8...Qb6–/+ 9.f4 c5 10.Nf3 Be7 11.ab4 Ra1 12.Ba1 Qb4 (12...cb4 13.Bd4 Nc5 14.d3=+) 13.Nc3=+ 0–0 Black plans c4 14.Qe1 c4 15.Qg3 Qa5 (15...Nc5 16.Rb1 Qa5 17.Bb2=+) 16.Rb1 (16.Bb2 Qc7=+) 16...b6 17.Nd4 Bb7 18.Ndb5 Ba6 19.Nd4 (19.Nc7 b5 20.f5 A) 20...ef5? 21.N3d5 Bd8 22.Bc3 Bc7 23.Nc7+– (23.Ba5?! Bg3 24.Ne7 Kh8 25.hg3 Ne4+=; worse 23.Qc7 Qc7 24.Nc7 Bb7+–); B) 20...Nc5=+) 19...Qc5 20.Bb2 Rb8 (20...Ra8 21.d3=+) 21.Ra1 Qc8 22.Bf3 Bb7 23.Ncb5 Ra8 24.Na7 Qe8 25.f5 (25.Ndb5 Qd8=+) 25...e5–/+ 26.Ndc6?? (better 26.Ndb5 Qb8 27.Ra4–/+) 26...Bc6–+ 27.Nc6 Ra1 28.Ba1 Bd6 29.Qe1 (29.Bc3 Qa8 30.Nb4 Bb4 31.Bb4 Qa1 32.Kf2 Qb2–+) 29...Qa8 30.Nd4 ed4 31.Bd4 Be5 (31...Qa2 32.Qd1–+) 32.g3 (32.Qb1 Bd4 33.ed4 Ne4 34.Be4 de4–+) 32...Qa4 33.Qc1 Bd4 34.ed4 b5 35.Qb2 (35.c3–+) 35...b4 Black prepares b3 36.Kg2 (36.Be2 Qa3 37.Qb1 b3 38.cb3 cb3–+) 36...Qa3 37.Qb1 b3 38.cb3 cb3 39.Bd1 (39.Qd3 Qb4 40.Bd1 b2–+) 39...b2 40.Bc2 Qa1 (40...Qb4!? 41.Qe1–+) 41.Kf2 Qa5 42.Ke2 (42.Qe1 Qb4 43.Kg2 Qd4–+) 42...Qb4 43.Qg1 (43.h3 Ne4 44.Qe1 Nb8–+) 43...Ne4 44.Qe3 b1Q 45.Bb1 Qb1 46.g4 (46.h3 Ndf6 47.g4 h6–+) 46...Ndf6 47.g5 (47.h3 h6 48.d3 Nc3 49.Kd2 Nb5–+) 47...Ng4 48.Qa3 Qb8 49.Kd1 (49.Qa5 Qh2 50.Kd3 Ngf2 51.Kc2 Qb8–+) 49...Nh2 50.Kc1 Nf1 51.Qb2 (51.d3 Ng5 52.Qc5 Qf4 53.Kb2 Qf2 54.Kc3 Qd2 55.Kb3 Qd3 56.Kb4 Qb1 57.Ka5 Qf5 58.Qd6–+) 51…Qb2 (51...Qb2 52.Kb2 Ng5–+) 0–1. gluv51 (2080) – qphys8 (2015), gameknot.com, 2017.

5.e3 Nd7 6.Be2 Ngf6 7.d4 (7.0–0 c6=+) 7...e6 (7...Ne4 8.0–0–/+) 8.c3=+ bc3 9.Nc3 Be7 10.0–0 0–0 11.Qc2 Qb6 12.a4 h6 13.Ba3 Ba3 14.Ra3 c5 15.Rc1 c4 16.e4 de4 (16...Qb4 17.Ra2=+) 17.Ne4 Ne4 18.Qe4 Qb2 19.Rac3 Nf6 20.Qc2 (20.Qb1 Qb1 (worse 20...Qe2 21.Re3 Qe3 22.fe3+–) 21.Rb1 Ra4 22.Bc4 Bd7 23.Rb7 Rc8=+) 20...Qc2–/+ 21.R3c2 Ra4 22.Rc4 Rc4 23.Bc4 Bd7 24.Ne5 Rc8 25.Rb1 Ng4 26.Nd7 (26.Ng4 Rc4 Deflection) 26...Rc4 27.Ne5 Ne5 28.de5 b5 29.g3 Rc5 30.f4 f6 31.ef6 gf6 32.Kf2 e5 (32...Kf7 33.g4–/+) 33.Ke3=+ ef4 (33...Kf7 34.fe5 fe5 35.g4=+) 34.Kf4 Re5 35.Rc1 Kf7 36.Rc7 Re7 37.Rc3 Kg6 38.Rb3 Re5 39.h3 Kf7 40.Rc3 b4 41.Rb3 Rb5 42.Ke4 Kg6 43.Kd4 (43.Kd3 Kg5=+) 43...h5 44.Kc4 Attacks the isolani on b4 44...Rb8 45.Kc5 (45.Rb4?? Rb4 46.Kb4 Kf5–+) 45...Ra8 46.Rb4 (46.Kb4?? Rb8 47.Kc4 Rb3 48.Kb3 Kf5–+) 46...Ra3 47.Rb8 Kg7 48.g4 (48.Rb7 Kh6 49.Rb1 Rg3–+) 48...hg4–/+ 49.hg4 Ra4 50.Kd5 (50.Rb2 Rg4 51.Re2 f5–/+) 50...Rg4–/+ 51.Ke6 (51.Ra8 Kg6–/+) 51...Rg5 52.Kd6 (52.Rb1 Re5 53.Kd6 Kg6–/+) 52...Ra5 53.Rb1 Kf7 54.Re1 f5 55.Rf1 (55.Re5!? Ra6 56.Kd5–/+) 55...Kf6–+ 56.Kc6 Ke6 57.Rh1? (57.Rf4 Ke5 58.Rh4 Ra3–+) 57...f4 58.Rh3?? (58.Rh6 Kf7 59.Rh3–+) 58...Rf5 59.Rf3 (59.Rh1 f3 60.Re1 Kf6 61.Kd6–+) 59...Ke5 60.Kd7 Ke4 61.Ra3 f3 62.Ke6 Rb5 63.Ra2 Ke3 64.Ra3 Kf2 (64...Ke2 65.Ra2 Kf1 66.Ra8–+) 65.Kd7 (65.Ra8 Kf1–+) 65...Kg2 66.Ra8 f2 67.Rg8 Kf3 68.Rf8 Ke2 69.Re8 Kd3 70.Rf8 Ke3 71.Re8 (71.Kd6–+) 71...Kf4 72.Rf8 Rf5 73.Rf5 Kf5 (73...Kf5 74.Kc7 f1Q 75.Kb8 Qb1 76.Kc7 Qb5 77.Kd8 Qb7 78.Ke8 Ke6 79.Kd8 Qd7) 0–1. andytop10 (2090) – gluv51 (2030), gameknot.com, 2018.

5.Be5 Qg6 (5...Qd8 6.ab4 Ra1 7.Ba1 f6 (7...Nf6 8.e3) 8.d4; 5...Qd7 6.ab4 Ra1 7.Ba1 f6 8.d4; 5...Qc6 6.ab4 Ra1 7.Ba1 Qb6 (7...Na6 8.c3) 8.c3= (8.b5)) 6.ab4 (6.Bc7 Nc6 7.e3 Bf5 8.c3) 6...Ra1 7.Ba1 e6 (7...f6 8.Nc3 c6 9.b5=) 8.Be5 f6 9.Bc7 Na6 10.Bg3 Nb4 11.Na3 Nh6 12.c3 Nc6 13.Nb5 Nf5 14.e3 Qh5 (14...Ng3 15.hg3 Be7 16.Nc7 Kd8 17.Na8=) 15.Bc7+= Qg6 16.d4 Bd7 (16...Be7 17.Rg1+=) 17.h3 Be7 18.g4 Nh6 19.Bd3 Qf7 20.Nd6 (20.Bf4 g5 21.Nd6 Bd6 22.Bd6 e5 23.de5 fe5+=) 20...Bd6+= 21.Bd6 Qg8 (21...e5 22.de5 fe5 23.Ne5+/–) 22.Qa4 (22.Qb3 Nf7 23.Bc5 Nfd8+/–) 22...Nd8 (22...Nf7 23.Qa8 Nfd8 24.Qa2+/–) 23.Qa8 Nhf7 24.Bc7 Qf8 25.0–0 (25.g5 Bc6+/–) 25...Qe7+= 26.Bb6 Bc6 27.Ra1 e5 28.Nh4 e4 29.Nf5 Qd7 30.Qa3 (worse is 30.Ng7 Kf8 31.Nh5 ed3+/–) 30...Rg8 31.Be2 (31.Bd8 ed3 32.Bb6 Ng5+=) 31...g6= 32.Ng3 Ng5 33.Kg2 Kf7 34.h4 (34.Qb3 f5+/–) 34...Nge6+= 35.Qb3 f5 36.gf5 gf5 37.Bh5 Kf6 38.Kh1 (38.Kf1 f4 39.ef4 Nf4 40.Ne4 Kg7=) 38...f4= 39.ef4 Nf7 40.f5 Nf4 41.Qd1 Qd6 42.Bc5 Qc7 43.Qg1 Nh6 44.Ra8!? Ra8 45.Bd6 Nh3 (45...Qd6 46.Ne4) 46.Be5+– (46.Bc7 Ng1 47.Be5 Ke7 48.Kg1 Nf7+=) 46...Ke7 47.Qc1 (47.Qc1 Nf2 48.Kg2 Qe5 49.de5+–; 47.Bc7? Ng1 48.Kg1 Ra1 49.Kg2 Bd7–+) 1–0. Kaniak,Andrzej – Blumberg, email 4AMM–09, 1997.

4.Nf3 Nd7

5.Nc3 c6 6.e4 d4 7.Ne2+=.

5.Nc3 Ngf6 6.Nb5 Qb6 7.e4 (better 7.e3!? c6 8.Bd4=) 7...Ne4=+ 8.Bd4 Qc6 9.a4 (9.Bd3!? f6 10.c4 dc4 11.Nc7 Qc7 12.Be4=+) 9...ab4–/+ 10.Ne5 Ne5 11.Be5 f6 12.Nc7 Kf7 13.Na8 fe5 14.Bb5 Qc5 15.Qf3 Nf6 16.Qe3 d4 17.Qd3 Be6 18.f3 g6 19.a5 Bh6 20.Nb6 Kg7 21.Na4 Qd6 22.Qe2 b3 (22...Ra8 23.Nb2 e4 24.fe4=+) 23.cb3 e4 24.fe4 Bd2 25.Qd2 (25.Kd2? Qb4 26.Kc1 Rc8 27.Bc4 Qb3–+) 25...Ne4 26.Qd3 Rf8 27.Rf1?? (27.0–0–0 Qa3 28.Nb2–+) 27...Qb4–+ 28.Ke2 Bf5 29.Rab1 (29.Rf4 Nc3 30.Qc3 Qb5 31.Qc4 Qe5 32.Kd1 Qf4 33.g4 Bg4 34.Kc2 Qh2 35.Kc1–+) 29...Nc3 30.Nc3 Bd3 31.Bd3 Rf1 32.Na2 (32.Rf1 Qc3 33.Rd1 Qb2 34.Kf1 Qb3–+) 32...Qa5 33.Kf1 Qa2 34.Be4 e5 35.h4 (35.h3 Qd2 36.Re1 Qf4 37.Bf3 d3–+) 35...Kh6 36.b4 (36.Kg1–+) 36...Qc4 37.Kf2 d3 38.Ke3 d2! 39.Rd1 (39.Kd2 Qe4 Deflection) 39...Qd4 40.Kf3 Kh5 41.b5 (41.g3 b5–+) 41...Kh4 42.g3 (42.Rh1 Kg5 43.Rd1 h5–+) 42...Kg5 43.b6 h5 44.Rd2 Qd2 45.Bc6 Qd3 46.Kf2 (46.Kg2 Kg4 47.Bf3 Qf3 48.Kh2 Qf2 49.Kh1 Kf3 50.g4 Qg2) 46…Kg4 (46...Kg4 47.Bb5 Qb5 48.Ke3 Qd7 49.Kf2 Qd2 50.Kf1 Kg3 51.Kg1 Qg2) 0–1. gluv51 (2075) – objorn (2435), gameknot.com, 2017.

5.Nc3 Ngf6 6.e3 c6= (worse 6...ab4 7.Nb5 Qb6 8.ab4 Ra1 9.Qa1+– (9.Ba1?! e5=)) 7.d4 ab4 8.ab4 Ra1 9.Qa1 Qb4 10.Bd3 e6 11.0–0 Be7 12.Re1 0–0 13.e4 Ne4 14.Ne4 de4 15.Re4 Nf6 16.Re1 (16.Rh4 Nd5 17.Rh7 Nf4=) 16...b5=+ 17.c3 Qd6 18.Qa7 Qd7 19.Qd7 Bd7 20.Ne5 Rd8 21.Nd7 Rd7 22.Ra1 Nd5 23.Kf1 (23.Ra6 b4 24.Rc6 bc3 25.Bc3 Nc3 26.Rc3 g6=+) 23...f5=+ 24.Ra6 Rc7 25.g3 Bf6 26.g4 (26.Kg2 Kf7 27.Ra5 b4 28.cb4 Nb4–/+) 26...Nf4 (26...g6 27.gf5 ef5 28.Be2–/+) 27.Bc2=+ fg4 28.Be4 c5 29.dc5 Kf7 30.c6 Nd5 Attacking the isolated pawn on c3 31.Ba3 (31.Ke2 g6=+) 31...Be5 32.Kg1 (32.Kg2 Nc3 33.Bd3 Rc8–/+) 32...Rc8 (32...Bc3 33.Bd6 Rc8 34.c7–/+) 33.Bb4 Bc3 34.Bd5 Bb4 35.Ra7 Kf6 36.Bg2 Be7 37.Rd7 (37.Kf1 Bd6–/+) 37...b4 38.Kf1 h5 39.Ke2 b3 (39...Bc5 40.Be4–/+) 40.Rb7 (40.Kd3!? Bc5 41.Kc3–/+) 40...Bd6–+ 41.Rb3 Bh2 42.Rd3 (42.Kf1 h4–+) 42...Be5 (42...Bf4 43.Rd4 g5 44.Rd1–+) 43.Ra3 (43.Be4 Bf4–+) 43...Bf4 44.Ra4 (44.Be4 h4–+) 44...g5 45.Ra7 (45.Be4 h4–+) 45...h4 Black plans g3 46.Be4 Rd8 (46...h3 47.Ra1–+) 47.Ra2 (47.Rd7 Ra8–+) 47...h3 48.Ke1? (48.Ra7 Rd2 49.Ke1 h2–+) 48...Rd4 49.Bh1 g3 50.fg3 Bg3 51.Ke2 g4 52.Ra8 (52.Rb2 Be5–+) 52...Bf4 53.Rf8 Kg5 54.Rh8 (54.Rg8 Kh4 55.Rf8–+) 54...Rd2 55.Ke1 Rb2 Black intends h2 56.Rg8 Kh4 57.Rh8 Kg3 58.Be4 Rb3 59.Kd1 h2 60.c7 Bc7 61.Ke2 (61.Rh7 Re3 62.Bh1–+) 61...Bf4 62.Bh1 (62.Kd1 Re3 63.Bb7 e5–+) 62...Re3 63.Kf1 Be5 64.Rd8 Rf3! 65.Ke1 (65.Bf3 Kf3 Combination) 65…Bc3 (65...Bc3 66.Ke2 Rf2 67.Ke3 Rf1–+) 0–1. andytop10 (2090) – objorn (2385), gameknot.com, 2018.

3.a3 c5

4.b5 a6 5.a4 (5.Nf3!?=) 5...ab5=+ 6.ab5 Qb6?? (better 6...Ra1 7.Ba1 Nd7=+) 7.Ra8+– Qb5 (7...Qd6 8.Nf3 f6 9.c4+–) 8.Rb8 Qb2 (8...Kd8 9.Be5 Qa5+–) 9.Rc8 Kd7 10.Rf8 g6 11.Nc3 Qb6 12.Nd5 Qd6 13.Qa1 (better 13.e4 Nf6 14.Bb5 Ke6 15.Rh8 Qe5+–) 13...Qd5 14.Qh8 b5 15.Rg8 Qa2 16.Rd8 Ke6 (16...Kc7 17.Rc8 Kb7 18.Rb8 Ka6 19.Ra8 Kb7 20.Qc8 Kb6 21.Ra2 b4 22.e3 c4 23.Bc4 b3 24.Ra6) 17.f4 Qb1 (17...Qa1 18.Qa1 f6 19.e4 Kf7 20.Qa8 f5 21.Qd5 Kg7 22.Qg8 Kh6 23.Be2 fe4 24.Qf8) 18.Kf2 Qc2 (18...Qa1 19.c3 f6 20.e4 Qf1 21.Kf1 f5 22.Qg8 Kf6 23.Rf8) 19.Qe5 1–0. GuestZLYS – GuestBPXT, freechess.org, 2020.

4.b5 Qb6 5.e3+= Nf6 6.c4. DEFFM – guestseeni, freechess.org, 2019.

4.e3 cb4=+ 5.ab4 Qb4 6.Bc3 Qc5 (6...Qg4 7.Nf3=+) 7.d4 (better 7.Bd4 Qd6 8.Ba7=) 7...Qc3?? (better 7...Qc7=+) 8.Nc3+– e5 (8...e6 9.Nb5 Kd8 10.Na7+–) 9.Nd5 ed4 (9...Bd6 10.de5 Be5 11.f4+–) 10.ed4 (better 10.Qd4 Kd8 11.Nb6 Nd7 12.Na8 Ngf6+–) 10...Kd8 11.c4 (11.Nb6! Bb4 12.Ke2 ab6 13.Ra8 Bd6+–) 11...a5 (11...Nf6 12.Nf6 Bb4 13.Ke2 gf6 14.Qd3+–) 12.c5 b5 (12...Ne7 13.Qb3 Nd7 14.Nb6+–) 13.Qc2 (13.Nb6 Ra7 14.Nc8 Kc8 15.Bb5 Nf6+–) 13...Nc6 Black plans b4 (13...Bb7 14.Qf5 Ne7 15.Ne7 Be7 16.Qf7+–) 14.0–0–0 (better 14.Bb5!? Nge7 15.Ne7 Ne7+–) 14...b4 (14...Rb8 15.Qe4 Be6 16.Nf3+–) 15.Bb5 (better 15.Nb6 Ra7 16.Nc8 Kc8 17.d5+–) 15...Kd7 (15...Nce7 16.Nb6 Ra7 17.Nc8 Nc8 18.Qa2+–) 16.Bd3 (better 16.Qf5 Kd8 17.Qf7+–) 16...Nd4 (16...Kd8 17.Nb6 Rb8 18.Qa4+–) 17.Qb1 (better 17.Nb6 Ke7 18.Qb2 Nb3 19.Qb3 Be6+–) 17...Bc5 18.Bh7 (18.Ne2 Bb7 19.Nd4 Bd5+–) 18...Nh6 (18...Ne7 19.Qe4 Nec6+–) 19.Nf3 Ne2 20.Kd2 (better 20.Kb2 Ra6+–) 20...Nf4 (20...Nc3 21.Nc3 bc3 22.Kc2 Ke7+–) 21.Nf4 g6 (21...Bd6 22.Qd3 Rd8 23.Rhe1+–) 22.Ne5 Ke7 23.Nfg6! fg6 24.Ng6 A double attack 24...Kf7 25.Nh8 Kg7 26.Qg6 Kh8 27.Qh6 Ra6 28.Rde1 (28.Bg6 Kg8 29.Qh7 Kf8 30.Qf7) 28...Rh6+– 29.Re8 (29.Bd3 Bd7 30.Re5 Bb6+–) 29...Kh7+– 30.Rc8 Bf2 31.g4 a4 32.Rc7 Kg6 (32...Kg8 33.Rc4 Bb6 34.Kc2+– (34.Rb4? Ba5–+)) 33.Rc6 (33.Rc4!? Bb6+–) 33...Kg5 34.Rh6 Kh6 35.h4 a3 36.g5?? (better 36.Kc2+–) 36...Kg6 37.h5 Kg5 38.h6 Kf5?? (better 38...Bd4 39.Kc2 a2=) 39.h7 Bd4 40.h8Q Bh8 41.Rh8 b3 42.Rf8 Ke4 43.Rb8 (43.Ra8 Kd4+–) 43...b2 (better 43...a2–+) 44.Kc2 Kd4 45.Ra8 Kc4 46.Ra3 Kb4 47.Kb2 Kc4 48.Rc3 Kd4 49.Kc2 Ke4 50.Kd2 Kf4 51.Re3 Kg4 52.Ke2 Kf5 (52...Kf4 53.Re8 Kf5 54.Ke3 Kg5 55.Re5 Kh6 56.Kf4 Kg6 57.Re6 Kh7 58.Kf5 Kg7 59.Re7 Kf8 60.Kf6 Kg8 61.Re8 Kh7 62.Rd8 Kh6 63.Rh8) 53.Kd3 (53.Kf3 Kg6 54.Ke4 Kf6 55.Kf4 Kg6 56.Re6 Kh7 57.Kf5 Kg7 58.Re7 Kf8 59.Kf6 Kg8 60.Re8 Kh7 61.Rf8 Kh6 62.Rh8) 53...Kf4+– 54.Kd4 Kg4 (54...Kf5 55.Rd3 Kg5 56.Ke5 Kg6 57.Rg3 Kf7 58.Kf5 Ke7 59.Rd3 Kf7 60.Rd7 Ke8 61.Ke6 Kf8 62.Kf6 Kg8 63.Rd8 Kh7 64.Re8 Kh6 65.Rh8) 55.Ke4 (55.Ke5 Kg5 56.Rg3 Kh4 57.Kf4 Kh5 58.Rg2 Kh6 59.Kf5 Kh7 60.Kf6 Kh8 61.Kf7 Kh7 62.Rh2) 55...Kg5 56.Ke5 Kg4 57.Ke4 (57.Rd3 Kg5 58.Rg3 Kh4 59.Kf4 Kh5 60.Rg2 Kh6 61.Kf5 Kh7 62.Kf6 Kh8 63.Kf7 Kh7 64.Rh2) 57...Kg5 58.Rg3 (58.Rf3 Kg4 59.Rf5 Kg3 60.Rf6 Kg4 61.Rg6 Kh5 62.Rg8 Kh6 63.Kf5 Kh7 64.Rg6 Kh8 65.Kf6 Kh7 66.Kf7 Kh8 67.Rh6) 58...Kh4 (58...Kf6 59.Kd5 Kf5 60.Rf3 Kg5 61.Ke5 Kh5 62.Kf5 Kh6 63.Kf6 Kh7 64.Rh3 Kg8 65.Rh5 Kf8 66.Rh8) 59.Kf4+– Kh5 60.Rh3 (60.Rg2 Kh6 61.Kf5 Kh7 62.Kf6 Kh8 63.Kf7 Kh7 64.Rh2) 60...Kg6 61.Ke5 (61.Rh1 Kf6 62.Re1 Kg7 63.Kf5 Kf7 64.Re6 Kg7 65.Re7 Kf8 66.Kf6 Kg8 67.Re8 Kh7 68.Rd8 Kh6 69.Rh8) 61...Kg5 62.Rg3 Kh4 63.Kf4 (63.Rg6 Kh5 64.Kf6 Kh4 65.Kf5 Kh3 66.Kf4 Kh2 67.Kf3 Kh1 68.Kf2 Kh2 69.Rh6) 63...Kh5 64.Rh3 (64.Rg2 Kh6 65.Kf5 Kh7 66.Kf6 Kh8 67.Kf7 Kh7 68.Rh2) 64...Kg6 65.Ke4 (65.Rd3 Kf6 66.Rd6 Ke7 67.Ke5 Kf7 68.Kf5 Ke7 69.Rd4 Kf7 70.Rd7 Ke8 71.Ke6 Kf8 72.Kf6 Kg8 73.Rd8 Kh7 74.Re8 Kh6 75.Rh8) 65...Kg5 (65...Kg7 66.Kf5 Kf7 67.Re3 Kg7 68.Re7 Kf8 69.Kf6 Kg8 70.Re8 Kh7 71.Rd8 Kh6 72.Rh8) 66.Kf3 (66.Rf3 Kg4 67.Rf5 Kg3 68.Ke3 Kg4 69.Rd5 Kg3 70.Rd4 Kg2 71.Rg4 Kh2 72.Kf2 Kh3 73.Rf4 Kh2 74.Rh4) 66...Kf5+– 67.Ke3 Kg4 68.Rf3 Kg5 69.Ke4 Kg4 70.Re3 (70.Rf4 Kg5 71.Kf3 Kh5 72.Rg4 Kh6 73.Ke4 Kh5 74.Kf5 Kh6 75.Kf6 Kh7 76.Rh4 Kg8 77.Rh5 Kf8 78.Rh8) 70...Kg5 71.Rg3 (71.Rd3 Kg6 72.Rd6 Kg5 73.Rc6 Kg4 74.Rg6 Kh4 75.Kf5 Kh3 76.Kf4 Kh2 77.Kf3 Kh1 78.Kf2 Kh2 79.Rh6) 71...Kh4 72.Kf4 (72.Rg6 Kh5 73.Kf5 Kh4 74.Rg7 Kh3 75.Kf4 Kh2 76.Kf3 Kh1 77.Kf2 Kh2 78.Rh7) 72...Kh5 73.Rh3 (73.Rg2 Kh6 74.Kf5 Kh7 75.Kf6 Kh8 76.Kf7 Kh7 77.Rh2) 73...Kg6 74.Rg3 (74.Re3 Kf6 75.Re5 Kg6 76.Rf5 Kh6 77.Rg5 Kh7 78.Ke5 Kh6 79.Kf6 Kh7 80.Rh5 Kg8 81.Rh4 Kf8 82.Rh8) 74...Kf6?? (74...Kh5 75.Rg2 Kh6 76.Kf5 Kh7 77.Kf6 Kh8 78.Kf7 Kh7 79.Rh2) 75.Ke4 (75.Re3 Kg6 76.Re6 Kg7 77.Kg5 Kf7 78.Kf5 Kg7 79.Re7 Kf8 80.Kf6 Kg8 81.Re8 Kh7 82.Rd8 Kh6 83.Rh8) 75...Ke6 76.Rg6 Kf7 77.Kf5 (77.Rd6 Ke8 78.Kf5 Ke7 79.Rd4 Kf7 80.Rd7 Ke8 81.Ke6 Kf8 82.Kf6 Kg8 83.Rd8 Kh7 84.Re8 Kh6 85.Rh8) 77...Ke7 78.Re6 Kd7 (78...Kd8 79.Rd6 Kc8 80.Ke6 Kc7 81.Ke7 Kc8 82.Rd7 Kb8 83.Kd8 Ka8 84.Kc7 Ka7 85.Rd6 Ka8 86.Ra6) 79.Ke5 (79.Kf6 Kc8 80.Re7 Kd8 81.Ke6 Kc8 82.Kd6 Kd8 83.Re5 Kc8 84.Rb5 Kd8 85.Rb8) 79...Kc7 80.Kd5 Kb7 (80...Kd7 81.Re4 Kc7 82.Kc5 Kd7 83.Re3 Kc7 84.Rd3 Kb7 85.Rd7 Kc8 86.Kc6 Kb8 87.Rd8 Ka7 88.Re8 Ka6 89.Ra8) 81.Kc5 Kc7 82.Kd5 (82.Rd6 Kb7 83.Rd7 Kc8 84.Kc6 Kb8 85.Rd8 Ka7 86.Re8 Ka6 87.Ra8) 82...Kb7 83.Rc6 Kb8 84.Kd6 Kb7 85.Kd7 Ka7 (85...Kb8 86.Rb6 Ka8 87.Kd6 Ka7 88.Kc7 Ka8 89.Ra6) 86.Kc7 Ka8 87.Rb6 (87.Ra6) 87...Ka7 88.Kc8 (88.Rd6 Ka8 89.Ra6) 88…Kb6= ½–½. pat_cash87 – izzy_roi_94, lichess.org, 2020.

4.b5 e5=+

5.e3 Bf5 6.Nf3 e4 7.Nh4 =+.

5.e3 f6 6.c4 d4 7.ed4 cd4 8.Bd3 Be6 9.Ne2 Ne7 10.0–0 Nec6?? 11.f4 Na5= 12.fe5 fe5 13.Qc2 g6 14.Ng3 Nd7 15.Ne4 Qc7 16.Nf6 Nf6–/+ 17.Rf6 Qe7 18.Re6 Qe6 19.Qa4 b6 20.Be4 Rd8 21.d3 Bh6 22.Qc2 Be3 23.Kh1 0–0 24.Nd2 Rf2 25.Rd1 Qf6 26.h3 Rf8 27.Bc1 Bd2 28.Bd2 Rf1 29.Kh2=+ Rf2 30.Qc1?? Kg7?? 31.Bh6+= Kg8 32.Bf8 Qf8 33.Kg1 Nb3 34.Qg5 Nc5? 35.Qe5 Ne4 36.Qe4 Rf4 37.Qe6 Qf7 38.Qf7 Rf7 39.Re1 Rc7 40.Re4 Rd7 41.Kf2 Kf7 42.Ke2 Kf6 43.Kd2 Kf5 44.Kc2 Re7?? 45.Re7 (45.Re7 h5 46.Ra7+–) 1–0. carocan (1720) – kastaldi (1845), kurnik, 2011.

5.e3 Nf6 6.d4 (6.Nf3 e4 7.Ne5 Qe6=+) 6...ed4 7.ed4 c4 8.Nf3 Qb6 9.Nc3 a6 (9...Be7 10.Ne5=+) 10.Ne5 (10.Qe2 Be7=+) 10...ab5–/+ 11.Qe2 (11.Be2 Nc6 12.Bf3 b4 (< 12...Nd4 13.Nd5 Nd5 14.Bd5=) 13.ab4 Ra1 14.Qa1 Qb4 15.Nc6 bc6–/+) 11...Be6 12.f4 (12.Qe3!?–/+) 12...b4–+ (12...Qd4 13.f5 Ne4 14.fe6 Qe5 15.ef7 Kf7 16.Qf3 Nf6 17.Qe2 Qe2 18.Be2–+) 13.ab4 Ra1 14.Ba1 Bb4 15.f5 (15.Qe3 Qa5 16.Bb2–+) 15...Qa5 16.Kf2 Bc3 17.fe6 (17.Bc3 Qc3 18.g4 Bd7 19.Nc4 Ne4 20.Kg2 0–0–+ (< 20...dc4 21.Qe4 Kd8 22.Kg1–+; 20...Qc4?! 21.Qe4 de4 22.Bc4–+; < 20...Qd4 21.Nd6 Kf8 22.Ne4 de4 23.Qc4–+)) 17...Qa1 (< 17...Ba1 18.ef7 Kf8 19.Qe3–+) 18.Nf7 (18.ef7 Kf8 19.Kg3 Bd4 20.Nc4 Ne4 21.Kf3 Qc3 22.Qd3 Qc4 23.Qa3 Qc5 24.Qc5 Bc5–+) 18...0–0 (better is 18...Ne4 19.Kf3 Nc6 20.Kg4 Nd4 21.Nd6 Nd6 22.Qe5 Qd1 23.Kh3–+) 19.g3 (19.g4 Nc6 20.Bg2 Qa3–+) 19...Bd4 (19...Nc6!? 20.h3–+) 20.Kg2 Nc6 (20...Qa3 21.Qf3 Qe7 22.Qf4 Qe6 23.Ng5–+) 21.h4 (21.Nd6 Ng4 22.Qg4 Rf2 23.Kh3 Rf1–+) 21...Ne4 (21...Qc3 22.Ng5 Ne7 23.Nf3–+) 22.Qg4 Qc1 23.Be2 Qh1! (24.Kh1 Nf2 25.Kg2 Ng4 26.Bg4 Nb4–+; 23...Qc2?! 24.Nh6 Kh8 25.Nf7 Kg8 26.Nh6 Kh8 27.Nf7 Kg8=) 0–1. Krkljes,Slaven – Plenkovic,Zdenko, CRO–ch U17 Pula, 2001.

5.e3 Nf6 6.Be2 d4 7.Nf3 Be7 8.0–0 0–0 9.ed4 ed4 10.d3 b6 11.Nbd2 Bb7 12.Nc4 Qc7 13.Re1 Nbd7 14.Bc1 Rfe8 15.g3 a6 16.Bf4 Qd8 17.a4 ab5 18.ab5 Ra1 19.Qa1 Qa8 20.Bf1?? Bf3 0–1. elsh1403 – kastaldi (1840), kurnik, 2011.

4.bc5 Qc5

5.Nc3 Nf6 6.e3 a6 7.Qf3 Bg4 8.Qg3 Qb6 9.Rb1 d4 10.Na4?? Qa5 11.h3?? Qa4 12.Qc7? Qd7–+ 13.Qd7 Bd7 14.Bd4 Nd5 15.Rb7 Ba4 16.Bd3 e6 17.c4 Bc6 18.Rb1 Ba3?? 19.cd5+= Bd5 20.e4 Ba2?? 21.Ra1+– Nc6 22.Be3?? Nb4=+ 23.Bb1 Bb2?? 24.Ra2+/– Na2 25.Ba2 0–0 26.Ne2 f5?? 27.Be6 Kh8 28.Bc5 Rf6 29.Bf5 Rb8 30.0–0 Be5 31.d4 Bc7 32.Ng3 Bg3 33.fg3 g6 34.Bg4 Rf1 35.Kf1 Rb1 36.Kf2 a5 37.Be6 Rb2 38.Kf3 Kg7 39.d5 Rb3 40.Kf4 Kh6 41.Kg4 g5 42.Bf5 Kg7 43.d6 Rb8 44.d7 Rh8 45.Bd4 Kh6 46.Bh8 a4 47.d8Q a3 48.Qf8 (48.Qg5) 1–0. Treaclebelly – karlsdad, ChessWorld.net, 2011.

5.e3 Qb6 6.Qc1 Nf6 7.Nf3 g6 8.Be2 Bg7= 9.0–0 0–0 10.d4 Nc6 11.Nbd2 Bf5 12.c4 dc4 13.Nc4 Qd8 14.a4 Rc8 15.Ba3 Na5 16.Bb4? Nc4 17.Bc4 Bd3 18.Bd3=+ Rc1 19.Rfc1 Nd5 20.Ba3 Qd7 21.Bb5 Qg4 22.Rc5 e6 23.Rac1 a6 24.Be2 Qe4? 25.Nd2 Qh4 26.g3 Qh3?? 27.Bf3 Rd8?? 28.Rb1?? b6 29.Rc6= Qf5 30.Bd5 Qd5= 31.Rcb6 Qa2 32.Bb2 Qa4–/+ 33.Ra1 Qc2 34.Nf3 Bf8 35.Raa6 Qb1 36.Kg2= Qe4 37.h4?? h6 38.Rb5 Kg7 39.Ra7 Kg8 40.Rbb7 Qf5?? 41.Rf7+/– Qf7 42.Rf7 Kf7 43.Ne5 Ke7? 44.Nc6+– Kd7 45.Nd8 Kd8 46.e4 Bd6 47.d5 e5 48.Kf3 Ke7 49.Ke2 Kf6 50.Ke3 Ke7 51.f4 Kf6 52.Kf3 g5 53.hg5 hg5 54.fe5 Be5 55.Be5 Ke5 56.Kg4 Ke4 57.d6 1–0. carocan (1690) – kastaldi (1810), kurnik, 2011.

5.e3 Qb6 6.Bd4 Qd8 7.Bb2 Nc6 8.d4 Nf6 9.Nf3 g6 10.Be2 Bg7 11.0–0 0–0 12.c4 dc4 13.Bc4 Bd7 14.Nbd2 Rc8 15.Qe2 Na5 16.Bd3 Qb6 17.Rab1 Qd8 18.Rfc1 Rc1 19.Rc1 b6 20.Nc4 Nc4 21.Bc4 Qa8 22.Ne5 Bf5 23.f3 Nd7? 24.Nd7 Bd7+= 25.e4 Rc8 26.d5 e6 27.Bg7+/– Kg7 28.de6 Be6 29.Qb2 Kg8 30.Be6 fe6 31.Rc8 Qc8 32.Qf6 Qc5 33.Kf1 Qd6 34.h4 b5 35.e5 Qd5= 36.Kf2 a5 37.g4 b4 38.ab4 ab4 39.h5 gh5 40.gh5 Qd7 41.Qg5 Kf8 42.Qf4 Ke8 43.Qb4+/– Qd5 44.Qe4 Qd2 45.Qe2 Qd4 46.Kg3 Qd5 47.Qe4 Qd2 48.Qh7?? Qg5?? 49.Kh3+– Qf4?? 50.Qg6 Kd7 51.Qf7 Qf7–+ 0–1. carocan (1715) – kastaldi (1785), kurnik, 2011.

5.e3 Qb6 6.Bd4 Qd8 7.c4 Nf6 8.Bf6 gf6 9.cd5 Qd5 10.Nc3 Qa5 11.Nf3 Nc6 12.Be2 Bg4 13.0–0 e6 14.Ne4 Be7 15.d4 Rd8 16.Qb3 Qc7 17.h3 Bh5 18.Ng3 Bg6 19.Bd3 0–0 20.Bg6 hg6 21.Rab1 b6 22.Rfc1 Qd7 23.Qb5 Rc8 24.Ne4 Rc7 25.a4 Rfc8 26.Rc2 Nb8 27.Qd7 Nd7 28.Rc7 Rc7 29.g4 Kf8 30.Kg2 Ke8 31.h4 Kd8 32.h5 gh5 33.gh5+/– f5 34.Ng3 Bf6 35.h6 Ke7 36.h7 Rc8 37.Nh5 Rh8 38.Nf6 Nf6 39.Rc1 Kd7?? 40.Ne5+– Ke7 41.Rc7 Kf8 42.Rf7 Ke8 43.Rf6 (43.Rf6 Rh7 44.Re6 Kd8 45.Rf6+–) 1–0. ludice (1630) – kastaldi (1720), kurnik, 2011.

5.e3 Qb6 6.Bd4 Qd8 7.Nf3 Nf6 8.Be2 g6 9.0–0 Bg7 10.c4 0–0 11.Qb3 Nc6 12.Bb2 Na5=+ 13.Qc2 Nc4 14.Bc4=+ dc4 15.Qc4 Be6 16.Qa4 Qb6 17.Bd4 Qc6 18.Nc3 Bc4 19.Rfc1 b5 20.Qd1 Qb7 21.d3 Be6 22.Rcb1 a6 23.Rb4 Rfc8 24.Rab1 Nd7 25.Bg7+= Kg7 26.Qd2 Qc7 27.Ne4 Nb6 28.Nd4 Qd7 29.h3 Nd5 30.R4b2 Rab8 31.Rc1 Rc1 32.Qc1 a5? 33.Qb1 b4+/– 34.Nc5 Qc6?? 35.Nce6 fe6 36.ab4 ab4?? 37.e4 Nc3?? 38.Nc6+– (38.Nc6 Nb1 39.Nb8+–) 1–0. carocan (1730) – kastaldi (1835), kurnik, 2011.

5.e3 Nc6 6.Nf3 Bf5 7.Nc3 Rd8 8.Bb5 a6 9.Bc6 bc6 10.0–0 h6 11.Nh4 Bh7 12.d4 Qa5 13.Nf3 Nf6 14.Ne5 Rc8 15.Ne2 e6 16.c4 Bd6 17.f3 (17.c5 Be5 18.de5 Ne4–/+) 17...Be5 (17...Qb6 18.Qd2 Rb8 19.Bc3=) 18.de5 Nd7 19.cd5 cd5 20.Rc1 0–0 21.Nf4 Rb8 22.Qd4 Rb3 23.Bc3 (23.Rc6 Qb5 24.Rc7 Rb2=+) 23...Qb6 (better is 23...Qa3!? 24.Qd2 Rfb8–/+) 24.Bb4= Rc8?? (better is 24...Re8=) 25.Rc8 1–0. johnk – Timber, Live Game Caissa's Web, 2004.

5.e3 d4? 6.Bd4+/– Qc4?? 7.Bc4+– (7.Bc4 Nc6 8.Qh5+–) 1–0. amator111 – spidermans2, kurnik, 2011.

5.e3 e5 6.Be5+/– Nc6 7.Bb2 Bf5+= 8.d3 Rc8 9.Nd2+/– Nh6 10.Ngf3 Bd6?? 11.Be2 0–0+/– 12.0–0 Rfe8 13.Nd4 Nd4= 14.Bd4 Qc2 15.Ba7 Bd3 16.Bd3 Qd3 17.Nf3 Qe4 18.Qd4 Nf5 19.Qe4 de4 20.Nd4 Nd4 21.Bd4 Rc2 22.a4 f5 23.Rab1 Re7 24.Rb5 g6 25.Rfb1 Ra2 26.a5 f4 27.Rb7 Rb7 28.Rb7+= Ra5 29.ef4?? Bf4?? 30.g3 Be5 31.Be3 Ra1 32.Kg2 Ra5 33.h4 Rd5 34.g4 Bd4 35.Bd4 Rd4+= 36.Re7 Kf8 37.Re5 Kf7+= 38.Kg3 Kf6 39.Re8 Rd3 40.Kg2 Rd4= 41.Rh8 Kg7 42.Re8 Kf7 43.Ra8 Rd7 44.g5 Re7 45.Ra3 Re6 46.Kg3+/– Kg8 47.Kf4 Kg7 48.Re3 1–0. carocan (1720) – sergi16aguero (1645), kurnik, 2012.

5.e3 Bf5 6.Nc3 d4 7.ed4 Qd4 8.Nf3 Qb6 9.Nd5 Qe6 10.Ne3 Nf6 11.Nd4 Qe5 12.Ndf5 Qb2 13.Nc4 Qa1 14.Qa1 Rg8 15.Qe5 Nc6 16.Qc7 Ne4 17.Qb7 Rb8 18.Qc6 Kd8 19.Ne5 Rb1 20.Ke2 Nc3 21.dc3 Re1 22.Ke1 f6 23.Qd7# 1–0. Machete99 – Saevita, ICC, 2002.

5.Nf3 Nc6 6.e3 Nf6 7.Be2 e6 8.0–0 Qd6 9.a4 a6 10.Ba3 Qd8 11.Bf8 Kf8 12.c4 dc4 13.Bc4 Ke7 14.d4 Re8 15.Nc3 Kf8 16.e4 Kg8 17.e5 Nd5 18.Ne4 Nb6 19.Bd3 Nd4?? 20.Nd4+– Qd4 21.Nf6!! Kf8 22.Ne8 Qe5 23.Re1 Qb8 24.Ng7! Kg7 25.Qg4 Kf8 26.Bh7 Nd5 27.Qg8 Ke7 28.Be4 Nf6 29.Qg7 Qe5?? 30.Rad1 Ng4?? 31.Qg4 f5 32.Qg5 Qf6 33.Qf6 Kf6 34.Bb1 Bd7 35.Rd7 1–0. wildmark2000 (1780) – lousse (1630), kurnik, 2011.

4.Nf3 cb4

5.ab4 Qb4 6.Ba3 Qb6 7.e3 Be6 8.Nd4 Nc6 (8...Bd7!?=+) 9.Ne6= fe6 10.c4 dc4 (10...g6 11.Nc3 Nf6 12.Rb1+=) 11.Bc4+= Ne5 12.Be2 0–0–0 (better 12...Nf6+=) 13.d4+– Nf7 14.Nd2 Kb8 (14...a6 15.Rb1 Qa5 16.Qc2 Kb8 17.Qc6+–) 15.0–0 (better 15.Bc5 Qc6 16.Ba7 Ka8 17.Bb6 Kb8 18.Bd8 Nd8 19.0–0+–) 15...Rd5 16.Bf3 Ra5 (16...Qc6+–) 17.Nc4 Qb3 (17...Ra3 18.Nb6 Ra1 19.Nd7 Kc8 20.Qa1 Kd7 21.Qa4 Kd8 22.Qa7 Kd7 23.Qb7 Kd8 24.Bc6 e5 25.Qd7) 18.Qb3 Nd8 19.Na5 Nc6 (19...b6 20.Qc4 g6 21.Nc6 Kc8 22.Ne5 Nc6 23.Qc6 Kd8 24.Qd7) 20.Bc6 (20.Qb7) 20...b6 21.Qe6 (21.Bd7 Ka8 22.Qc4 a6 23.Qa6 Kb8 24.Qb7) 21...g6 (21...Nh6 22.Qd7 ba5 23.Rfb1) 22.Qd7 Nf6 (22...ba5 23.Rfb1) 23.Qb7 1–0. BeepBeepImAJeep (2755) – J0j0, lichess.org, 2015.

5.Be5 Qc5 6.ab4+= Qb4 7.Nc3 Qg4?? 8.Nd5+– Kd8 9.Bc7 Kd7 10.Ne5 Ke6 11.Ng4 Kd5 12.Ne5 f6 13.e4! Ke4 14.Qf3 Kd4 15.Ra4 Kc5 16.d4# 1–0. wiking – tejqe, internet, 2010.

5.Be5 Qe6 6.ab4 Nc6 7.Bb2 (better 7.Bc3!?+=) 7...Nb4=+ 8.c3?? (8.e3 Bd7=+) 8...Nc6 (8...Nd3!) 9.Qa4 a6 10.e3 Bd7 11.c4 (11.Qb3 Qf5=+) 11...dc4 (11...Ne5 12.Qb4 Nf3 13.gf3 dc4 14.Qb7=+) 12.Qc4 Qg6 13.g3 e6 14.Bg2 Nf6 15.Ne5?? (better 15.0–0–/+) 15...Ne5–+ 16.Be5 Bb5 (better 16...Rc8 17.Bc7 Bd6–+) 17.Qc7= Ne4?? (better 17...Qd3 18.Nc3 Rd8=) 18.Qb7+– Rd8 19.Be4 (19.Qe4?! f6 20.Bd4 Qe4 21.Be4 e5+–) 19...Qg5 (19...Qh5 20.Bc6 Bc6 21.Qc6 Rd7 22.f4+–) 20.Bf4 (better 20.f4 Qe7 21.Bc7 Qd7 22.Bd8 Kd8+–) 20...Qc5 21.Nc3 Bd3 (21...Rd7 22.Qb8 Rd8+–) 22.Bc6 Rd7 23.Qd7 1–0. alessandrocarvalhaes (1890) – covid19_bioweapon (1865), lichess.org, 2020.

3.a3 c6

4.d4 Nf6 5.Nf3 Bg4 6.Nbd2 Nbd7 7.h3 Bf3 8.Nf3 e6 9.e3 Qc7 10.c4 dc4 11.Bc4 b5 12.Bb3 a5 13.ba5 Qa5 14.Ke2 (14.Nd2 Ne4=) 14...Qa6 15.Qc2 Be7 16.e4 (16.Rhd1 c5=) 16...0–0 17.Nd2 (17.g4 c5–/+) 17...Rfc8 18.Ke3? (better is 18.e5!? Nd5 19.Qe4+=) 18...c5–+ 19.dc5 Bc5 (19...Rc5?! 20.Qb1–/+) 20.Ke2 Bf2! 21.Qc8? (21.Kf2 Rc2 A double attack) 21...Rc8 (21...Qc8 22.Kf2 Nc5 23.Bf6 Nb3 24.Nb3 Qc2 25.Kf1 gf6 26.Nd4–+) 22.Kf2 Nc5 23.Bc2 (23.Bf6 Nb3 24.Nb3 gf6–+) 23...Nce4!! 24.Be4 Ne4 Theme: Double Attack 25.Ne4 Rc2 26.Ke3 Rb2 27.Rhd1 Qb6 28.Kf3 f5 29.Nd2 Qc6 30.Kf2 Qd5 (30...Qd5 31.Rab1 Rb1 32.Rb1 Qd2 33.Kg1 Qe3 34.Kh2 f4–+) 0–1. Mueller,R – Cagasik,Tomas, Olomouc op, 1998.

4.Nf3 Nd7

5.d4 Nb6 6.e3 Nf6 7.Bd3 Na4 8.Bc1 Bg4 9.c4 dc4 10.Bc4 Nb6 11.Bd3 Rd8 12.Nbd2 e5 13.Qc2 ed4 14.Nd4 c5 15.bc5 Qc5 16.Bb2 Qc2 17.Bc2 (17.Nc2? Rd3 18.h3 Bf5 19.Bf6 gf6–+) 17...Bd7 18.Rc1 Na4 19.Ba4 Ba4 20.Ke2 Be7 21.Rc7 Rd7 22.Rc4 b5 23.Rc8 Bd8 24.Rhc1 0–0 25.N4b3 Re8 (25...a6!?+=) 26.Bf6+– gf6 27.Ra8 f5 28.Rcc8 Rd5 29.Nc5 (29.Ra7?! f4 30.Raa8 fe3 31.fe3 Kf8+/–) 29...a5? (29...Kf8+–) 30.Nb7 (30.Na4?! ba4 31.Nc4 Kf8+–) 30...b4 31.ab4 (31.Nd8?! ba3 32.Ne6 Bb5 33.Kd1 fe6 34.Re8 Be8 35.Re8 Kf7+–) 31...Bb5 32.Kd1 ab4 33.Rd8 Rdd8 34.Rd8 Rd8 35.Nd8 Ba4 36.Kc1 Kf8 37.g3 Ke7 38.Nb7 Bc6 39.Nc5 Bb5 40.Kc2 Kd6 41.Nd3 Ba4 (41...Bd3 42.Kd3 Kc5 43.Nf3+–) 42.Kb2 b3 43.Nb3 Bb5 44.Kc3 Kd5 45.Nf4 Kd6 46.Nh5 Ke7 47.Nd4 Bd7 48.Kb4 Bc8 49.Kc5 Kf8 50.Kd6 h6 (50...Ba6 51.Nf5 Bd3 52.Ke5+–) 51.h4 Kg8 52.Ke7 1–0. Taulien,Hans_Juergen (2350) – Thoma,Theo (2100), remoteschach.de, 2004.

5.d4 Ngf6 6.e3 g6 7.c4 dc4 8.Bc4 Bg7 9.Nbd2 0–0 10.e4 Qc7 11.0–0 e6 12.Rc1 b6 13.Bb5 c5 14.Qc2 a6 15.Bd7 Bd7 16.dc5 bc5 17.Be5 Qc6 18.bc5 Rfd8 19.Nd4 Qc8 20.c6 Be8 21.N4f3 a5 22.c7 Rd7 23.Rb1 Ng4 24.Rb8 Rb8 25.cb8Q (25...Qc2 26.Qe8 Bf8 27.Qd7+–) 1–0. pierre (2130) – chessleon, internet, 2007.

4.Nf3 f6

5.d4+= Bf5 6.e3 +=.

5.d4+= Bg4 6.Nbd2 a5 7.c4 (7.ba5 Ra5 8.c4 Nd7+=) 7...Bf3= 8.gf3 ab4 9.c5 Qc7 10.ab4 Ra1 11.Qa1 b5 (11...b6 12.e4=) 12.e4 (12.Qa5 Qc8+=) 12...e6 13.Bh3 (13.Qa5 Qb7+=) 13...Kf7 (13...f5 14.ef5 ef5 15.Bf5+=) 14.0–0 (14.Qa5 Qf4+=) 14...g6 15.Qa8 Bh6 16.Be6 (better is 16.Ra1 Ne7 17.Ra7+=) 16...Ke6–/+ 17.ed5 cd5 18.Re1 Kf7 19.Qd5 The passed pawn on d4 quickly leads to threats 19...Kg7 20.Ne4 Bf4 21.Qe6 (better is 21.Nc3 Bh2 22.Kg2+=) 21...Qf7 (21...Bh2!? 22.Kg2 Bf4=) 22.Qb6 (22.d5!? Qe6 23.de6+=) 22...Nd7 (22...Ne7 23.Qf6 Qf6 24.Nf6 Kf6 25.d5 Kf7 26.Re7 Ke7 27.Bh8–+) 23.Qb5+= Nh6 (23...Qd5 24.Kg2=) 24.c6 (24.Bc1 Bc7 25.Qc6 Bb8+–) 24...Rb8+= 25.cd7 The passed pawn on d7 will quickly become a dangerous weapon 25...Rb5 26.d8Q Bc7 (26...Rb4 27.Bc1 Rb8 28.Qa5+=) 27.Qa8 (27.Qc8 Rb8 28.Qh3 Rb4 29.Bc3+–) 27...Nf5 (better is 27...Rb4!? 28.Nc5 Rb8+=) 28.Nc5+– Kh6 (28...Rb6 29.Bc3+–) 29.Ne6 Bd6 30.Qc6 Rb8 (30...Qb7 31.d5 Qc6 32.dc6 Rb4 33.Bf6+–) 31.Qe4 Rb5 32.d5 (better is 32.Bc3!? Ng7 33.Bd2 g5 34.Qc6 Ne6 35.Qd6+–) 32...Rb4+/– 33.Bc1 Kh5 34.Nf4 Bf4 35.Qb4 Bc1 36.Rc1 Qd5 37.Qg4 Kh6 38.Qh3 Kg5 39.Qg4 (39.f4 Kf4 40.Qh7 Kg5+–) 39...Kh6 40.Qe4 Qa5 41.h4 (41.Kg2 Qd2 42.Rc2 Qd6+/–) 41...Qe5 (41...Qd2 42.Rc5+/–) 42.Qg4 (42.Rd1 Qc7+/–) 42...Nd4 43.Rd1 Ne2 44.Kf1 (44.Kh1 Nc3 45.Rd3 Ne2+=) ½–½. Grund,Karl – Neu,K, corr BRD, 1971.

5.d4+= Bg4 6.Nbd2 Nd7 7.c4 +=.

5.d4 Bg4 6.Nbd2 Nd7 7.e4 =.

5.d4 Bg4 6.Nbd2 Bf3 7.Nf3+= a5 8.ba5 Ra5 9.e3 e6 10.Bd3 Qc7 11.0–0 Bd6 12.c4 f5 13.Qc2 Nf6 14.Rfc1 0–0 15.cd5 Nd5 16.e4 Nf4 17.Bc4 Kh8 18.g3 Ng6? 19.e5 Be7 20.Be6 f4 21.Kg2 Rd8 22.d5+– Rad5 23.Bd5 Rd5 24.Qf5 fg3 25.hg3 (25...b5 26.a4+–) 1–0. Grund,Karl – Spiegel,Mathias, corr SOK–88–24, 1988.

3.a3 Nc6

4.b5 Nd4?? 5.Bd4+– Nf6 6.e3 Bf5 (6...e5 7.Bb2+–) 7.Nf3 a6 (7...Bg4 8.c4+–) 8.c4 dc4 9.Bc4 c6 (9...ab5 10.Bb5 c6 11.Be2+–) 10.Ne5 cb5 (10...e6 11.bc6 bc6 12.Qa4+–) 11.Nf7 (better is 11.Bf7 Kd8 12.Nc3+–) 11...Rg8 (11...Qc6 12.Ne5 Qc7 13.Bf7 Kd8+–) 12.Nd6 ed6 13.Bf6 gf6 14.Bg8 Bh6 15.Qh5 Bg6 16.Qh6 Bc2 17.Bh7 (better is 17.Qf6 Kd7 18.Be6 Kc6 19.Qc3 Kb6 20.Qc2 Re8+–) 17...0–0–0 18.Bc2 f5 19.Bf5 Kb8 20.Nc3 Ka7 21.Nd5 b6 22.Qg7 Kb8 23.Qc7 Ka8 24.Nb6 1–0. nordlicht (2100) – harzer, gameknot.com, 2006.

4.e3 a5 5.b5 Nb8 6.c4 dc4 7.Bc4 Nf6 8.Nf3 Nbd7 9.0–0 Ne5?? (better 9...e6+=) 10.Be5+– (10.Be5 Qd8 11.Qc2+–) 1–0. BeepBeepImAJeep (2615) – CrystalChess (2310), lichess.org, 2016.

4.e3 Bf5 5.Nf3 0–0–0 6.Be2 f6 (6...a6!?=) 7.0–0 e5 8.d4 e4 (8...ed4!? 9.ed4 Re8+=) 9.Nfd2+– h5 (9...Be6 10.c4 f5 11.c5+–) 10.c4 g5 (better 10...Nge7!?+–) 11.Nc3+– g4? (11...Nce7+–) 12.cd5 Nce7 13.Bc4 h4 (13...Qb6 14.Qc2+– (14.Nde4?! Be4 15.Ne4 Nd5+–)) 14.Nde4 Be4 (14...Qd7 15.Nc5 Qe8 16.e4+–) 15.Ne4 Qd7 (15...Qb6 16.d6 cd6 17.Be6 (17.Qg4?! f5 18.Qf4 fe4+–) 17...Kb8 18.d5+– (18.Qg4?! f5 19.Qf4 fe4+–)) 16.Nc5 Qf5 (16...Qe8 17.Ne6 Nh6 18.Qc2+–) 17.e4 (17.Be2 Nh6 18.Bd3 Qg5+–) 17...Qg6 18.Qa4 a6 (18...Kb8 19.Qb5 b6+–) 19.Ba6! g3 (19...ba6 20.Qa6 Mate attack) 20.Bb7 Kb8 21.Qa8 1–0. DEFFM – GuestZWNQ, freechess.org, 2020.

4.e3 Nf6 5.Nf3 e6 6.Be2 b6 (6...a6 7.Bf6 gf6 8.d4=) 7.0–0+= Bd7 (7...a6 8.Bf6 gf6 9.d4+=) 8.h3 (8.b5 Na5+=) 8...h6 (8...a6 9.Bf6 gf6 10.d4+=) 9.c4 dc4 10.Bc4 Be7 11.Nc3 g5?? (better 11...a6+–) 12.Nb5+– Ne5 (12...Rg8 13.Nd6 cd6 14.b5+–) 13.Be5 (better 13.Nd6!? cd6 14.Ne5 de5 15.Be5 Rg8+–) 13...Qc6 14.Nc7 Kd8 15.Rc1 (15.Bb5 Qb5 16.Nb5 Bb5+–) 15...Rc8 16.Ba6 (16.Ba6 Qe4 17.Bc8 Bc8 18.Ne8 Ne8 19.Bh8+–) 1–0. GuestLFCZ – GuestYWJV, freechess.org, 2017.

4.Nf3 e5 5.b5+= e4 (5...Nd4 6.Nd4 ed4 7.Bd4+=) 6.bc6 ef3 7.cb7 Bb7 8.ef3 Nf6 9.Nc3 (9.Bb5 c6 10.Bd3+=) 9...g6 (9...a6!?+=) 10.Nb5 (10.Rb1 Bg7+/–) 10...Qe5?? (better is 10...Qe7 11.Be2 Bg7+/–) 11.Be5+– (11...Bg7 12.Nc7 Kd7 13.Bb5 Ke7 14.Qb1+–) 1–0. pcmvr – moover, internet, 2005.

4.Nf3 Nf6 5.b5 Na5 6.e3 =.

4.Nf3 h6 5.e3 Bg4 6.Be2 Bf3 7.Bf3 Nf6 8.d3 d4 9.Bc6 Qc6+=.

4.b5 Ne5

5.d3 Bf5 6.e3 0–0–0 (6...Nf6 7.Nf3 Nf3 8.Qf3=+) 7.Nf3 f6 (7...Nf3!? 8.Qf3 e6=+) 8.Be2+= g5 9.0–0 h5 10.Be5 (10.Ne5 fe5 11.Nd2 Bg7+=) 10...fe5= 11.Ng5 Be6 (11...Qg6!? 12.h4 Nf6=) 12.Ne6 Qe6 13.Bh5 (better 13.Nd2!?+=) 13...Nf6=+ 14.Be2 Bh6 15.Nd2 Rdg8 16.Re1? (16.Bf3 Bf8 17.g3=+) 16...Bf8?? (better 16...Be3 17.Bf3 Bd4–+) 17.g3+– Qh3 18.Nf1 Kb8 (18...e6 19.c4+–) 19.Bf3 Ng4?? Exerts pressure on the backward pawn (better 19...e6+=) 20.Bd5+– Rg7 (20...Nh2 21.Bg8 Rg8 22.Nh2+–) 21.Bg2 Qh6 (21...Qh7 22.h3 Nh6 23.d4+–) 22.Qf3 c6 (22...Qb6 23.a4 a5 24.ba6 Qa6 25.Rab1+–) 23.bc6 (better 23.h3 Nf6 24.bc6 e4 25.de4 e5+–) 23...bc6 (23...Qc6 24.Qc6 bc6 25.Bc6 Kc7+–) 24.Rab1 Kc7 (24...Kc8 25.h3 Nf2 26.Qf2+–) 25.h3 Nf2 (25...Qf6 26.hg4 Qf3 27.Bf3+–) 26.Qf2 Rg6 (26...Qd6 27.Rb3 Qf6 28.Qd2+–) 27.e4 Kd6 (27...Kd7 28.Rb7 Ke8 29.Rb8 Kd7 30.h4+–) 28.Qa7 (28.Ne3 Kd7 29.Rb7 Kc8 30.Reb1 Rf6 31.Nf5 Kd8 32.Rb8 Kd7 33.Qc5 Qe3 34.Ne3 Rf1 35.Rf1 Rh6 36.Rb7 Ke8 37.Rf8 Kf8 38.Qe7 Kg8 39.Qg7) 28...Qd2 (28...Ke6+–) 29.Nd2 Rg3 30.Qb8 Ke6 31.Qc8 Kf7 32.Qf5 Kg7 33.Qe5 Kf7 34.Rf1 (34.Rf1 Kg6 35.Qg3 Kh6 36.Rf4 Kh7 37.Rh4 Bh6 38.Qg5 Rb8 39.Rh6) 1–0. DEFFM – GuestTMQH, freechess.org, 2019.

5.d3 Nf6 6.Nd2=+.

5.e3 Nf6 6.Nf3 Nf3 7.Qf3 Bg4 8.Qg3 Qg3 9.hg3 0–0–0 10.f3 Bf5 11.c4 Bc2 12.d4 dc4 13.Bc4 e6 14.Nd2 Nd5 15.Kf2 Be7 16.e4 Nb6 17.Bb3 Bb3 18.Nb3 Nc4 19.Bc3 (better is 19.Bc1!?+=) 19...Na3–/+ (worse is 19...Ba3 20.Nd2 Nd2 21.Ra3+=) 20.b6 ab6 21.Rhc1 (21.d5 ed5 22.Bg7 Rhe8 23.ed5 Rd5 24.Rh7 Rd3–+) 21...Nb5 22.Bb2 Rhg8 23.d5 ed5 24.ed5 Kb8 25.Rh1 h6 0–1. Kultica – Trousersnake, playchess.de, 2002.

5.Nf3 Nf3 6.ef3 Nf6=+.

4.Nf3 Bg4

5.e3 (5.b5 Na5=) 5...0–0–0 (5...a6 6.d4=) 6.b5 Ne5 (6...Nb8 7.h3 Bh5 8.c4=) 7.Be5+= Qe5?? (better is 7...Bf3 8.Bd6 Bd1 9.Be7 Be7 10.Kd1 Nf6+=) 8.Ne5+– Bd1 9.Nf7 Bc2 10.Nh8 Nh6 11.Nc3 e6 12.d3 Bd6 13.Rc1 Bb3 14.Rb1 Bc2 15.Rb2 Bd3 16.Bd3 Rh8 17.e4 Ba3 18.Rb3 Bc5 19.ed5 ed5 20.Nd5 Re8 21.Kd2 Bf2 22.Rf1 Bh4 23.Rc3 Bg5 24.Kc2 Kd7 25.Rc7 Kd6 26.Rg7 Rc8 27.Kb3 Bd2 28.Nf6 Rc3 29.Kb2 Rd3 30.Rd7 (30...Ke5 31.Rd3+–) 1–0. mrkt – guest2935, ICC, 2005.

5.e3 0–0–0 6.Be2 h5 (6...e5 7.0–0=) 7.d4 f6 8.Nbd2 Nh6 9.c4 dc4 (9...e6 10.Rc1+–) 10.Nc4 (worse 10.Bc4 e5 11.b5 Na5 12.de5 fe5+–) 10...Qd7 (10...Qe6 11.Qb3+–) 11.Qa4 (better 11.b5 Nb8 12.Qa4+–) 11...Kb8? (better 11...a6+–) 12.Na5?? (better 12.b5 Nd4 13.Bd4+– (13.Nd4?! e5 14.Nf3 e4+–; 13.ed4?! e6+–)) 12...Na5 13.Qa5 Nf5 14.Rc1 Nd6 (14...Bf3 15.gf3 e5 16.Rd1= (16.de5? Qd2 17.Kf1 b6–+)) 15.a4 White intends b5 15...g5 16.b5 Bg7 17.Ba3 b6 (17...e5!? 18.de5 fe5 19.Bd6 cd6+=) 18.Qc3+– Rc8 19.Bd6 (better 19.h4!?+–) 19...cd6= 20.Qb2 Rc1 21.Qc1 Rc8 22.Qb2 e5 23.0–0 Bf3 (23...Qc7!?=) 24.Bf3+– g4 25.Be2 (25.Bc6!? Qc7 26.a5 ba5 27.Qb1+–) 25...f5 26.Rd1 e4 (26...Qc7 27.Qb3+=) 27.Bf1 (27.a5 ba5 28.b6 Qb7 29.ba7 Ka7+–) 27...Qe6 (27...Qc7!?=) 28.Qa3 Bf8 29.a5 d5 30.Qa4 Bd6 (30...h4!?+–) 31.ab6+– ab6 32.Qa6 (32.Qa6 Kc7 33.Rc1 Kd8 34.Qb6 Rc7 35.g3+–) 1–0. alessandrocarvalhaes (1850) – Adarshadarsh (1755), lichess.org, 2019.

3.a3 Nd7

4.Nf3 e5 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.Nf3 Nd7).

4.e3 e5

5.c4 dc4 6.Bc4 Qg6 (6...Qc6 7.Bf1 a5 8.Nf3=) 7.Nf3 e4 (7...Qg2? 8.Rg1 Qh3 9.Bf7 (9.Be5?! Ne5 10.Ne5 Be6+–) 9...Ke7 10.Nc3+–) 8.Nh4 Qg5 (8...Qh6 9.Qb3 Qh5 10.g3+=) 9.g3 Qe7 10.Nc3 Ne5 (10...Nb6 11.Be2+=) 11.Be2+– Nd3 (11...Nf6 12.Qa4 c6 13.b5+–) 12.Bd3 ed3 13.0–0 c6 (13...Nf6 14.Qf3 c6 15.e4+–) 14.e4 Bh3 15.Re1 Qd7 16.Rc1 Ne7 (16...Nf6 17.e5 Nd5 18.Ne4+–) 17.Re3 (17.Na4 Qg4 18.f3 Qe6+–) 17...b5 (17...Ng6 18.Nf5 h5 19.Na4+–) 18.f4 (18.Nf5 h5+–) 18...a5 19.f5 Nc8 (19...h5!?+–) 20.Qh5 ab4 (20...Nb6 21.Nf3 Nc4 22.Nd1 (22.Qh3?! ab4 23.Nd1 ba3+=) 22...ab4 23.ab4 (23.Qh3?! ba3 24.Ba1 a2+=) 23...Ne3 24.Ne3 Bb4 25.Bg7+– (25.Qh3?! f6+–)) 21.ab4 Bb4 (21...Nb6 22.Nd1 Nc4 23.Nf3 Bb4 24.Rc4 bc4 25.Qh3+–) 22.Nf3 Bc5? (22...0–0 23.Qh3 Bc5+–) 23.Nd1 (23.Qh3?! Be3 24.de3 0–0+=) 23...Be3 24.Ne3 0–0 (24...Kf8+–) 25.f6 Nd6 (25...h6 26.fg7 Qe6 27.Nd4+–) 26.Ng5 h6 27.fg7 (27.Qh3?! Qh3 28.Nh3 Ra2 (worse 28...Ne4 29.fg7 Rfc8 30.Nf5+–) 29.Rc6 Rd8=) 27...f6 28.gf8Q Rf8 29.Nh3 Qe8 (29...Nc4 30.Nc4 bc4 31.Rc4+–) 30.Qh6 Ne4 31.Nf4 Qf7 32.Rc6 Ra8 33.Bf6 Nf6 34.Rf6 Qg7 (34...Ra1 35.Kg2 Ra6 36.Ra6 Qb7 37.Nfd5 Qa6 38.Qa6 Kf7 39.Qf6 Kg8 40.Nf5 b4 41.Qg7) 35.Rg6 Ra7 (35...Ra1 36.Kg2 Qg6 37.Qg6 Kf8 38.Ne6 Ke7 39.Nf5 Kd7 40.Nc5 Kc8 41.Qc6 Kb8 42.Qb7) 36.Ne6 Qg6 37.Qg6 Kh8 38.Nf5 Ra1 39.Kg2 Rg1 (39...Ra7 40.Qe8 Kh7 41.Ng5) 40.Kg1 (40.Kg1 b4 41.Qg7) 1–0. ilbepi (2215) – gluv51 (2090), gameknot.com, 2017.

5.d4 e4 (5...a5 6.de5 Ne5 7.Nd2=+) 6.c4 c6 (6...Ne7 7.Nc3 Nf6 8.Rc1=) 7.cd5 (7.Nc3 a6=) 7...cd5 8.Nc3 Ngf6 (8...a6 9.Rc1=) 9.Nb5+= Qb8 (better is 9...Qb6!? 10.Qc2 Bd6=) 10.Rc1+– Bd6?? (better is 10...Kd8 11.Nc7 Qc7 12.Rc7 Kc7+–) 11.Rc8! (11...Qc8 12.Nd6 Ke7 13.Nc8 Rhc8 14.Ne2+–) 1–0. pcmvr (2535) – awhalley (2170), net–chess.com, 2006.

4.e3 Ngf6

5.c4 dc4 6.Bc4 Nb6 7.Be2 e5 8.Qc2 Bd7 9.Nc3 a5 10.b5 Be7 11.Nf3 0–0 12.d4 ed4= 13.Nd4 Rfe8 14.Nf5 Qc5= 15.Ne7 Re7 16.0–0 Bf5 17.Qc1 Rd8 18.Rd1 Rdd7 19.Rd7 Rd7 20.Bf3 Bd3 21.Bb7= Qe7 22.Bc6 Rd8 23.Na2 Nc4 24.Bd4 Ng4 25.h3+/– Nge5 26.Qc3 Nc6 27.bc6 Qa3+= 28.Qa3 Na3 29.Nc1 Nc2 30.Ra5 Nd4 31.ed4 Bc4 32.f3 Kf8= 33.Kf2 Ke7 34.Ke3 ½–½. Benassi,Aspasio (2155) – Marcotulli,Giancarlo (2220), Telechess, 2003.

5.c4 dc4 6.Bc4 e5 7.Qb3 White gets the initiative 7...Qe7 8.Nf3 h6 9.d4 ed4 10.Bd4 Ne4 11.Nc3 Nc3 12.Qc3 (worse 12.Bc3 Nb6+=) 12...Rg8 13.0–0 c5 (better 13...c6!?+–) 14.bc5+– Qe4 15.Bb5 Be7 (15...a6 16.Ba4 Rb8+–) 16.c6 (16.c6 a6 17.cd7 Bd7 18.Bd7 Kd7 19.Qb3+– (19.Bg7?! f6+–); 16.Bg7 Qg6 17.c6 bc6 18.Bc6 Rb8+– (18...Rg7?? 19.Ne5 Bf6 20.Ba8+–)) 1–0. marekt – mgilbert, net–chess.com, 2020.

5.Nf3 c6 6.c4 dc4 7.Bc4 e6 8.d4 b6 9.Nc3 Bb7 10.e4 Qc7 11.0–0 Be7 12.Rc1 a6 13.e5 White fights for the Initiative 13...Ng4 14.Ne4 c5 (14...a5 15.b5 Rd8 16.bc6 Bc6 17.Bb5 Nde5 18.Ne5 Ne5 19.de5 Rd1 20.Rfd1+–) 15.Nfg5 Be4 (better 15...h5+–) 16.Ne4+– (16.Qg4?! Bg6+=) 16...Nh6 17.d5 ed5 18.Nd6! Kf8 (18...Qd6 19.ed6) 19.Qd5 (19.Qd5 Bd6 20.Qa8 (20.Qd6?! Qd6 21.ed6 Nf5+–) 20...Qb8 21.Qb8 Bb8 22.e6 fe6 23.Rfd1+– (worse 23.Be6 Be5 24.Bc3 Ke7 25.Bd7 Bc3 26.Rc3 Kd7+–; 23.Ba6?! Ng4+–)) 1–0. pcmvr – mgilbert, net–chess.com, 2020.

5.Nf3 c6 6.c4 dc4 7.Bc4 e6 8.d4 b6 9.Nc3 Bb7 10.e4 Qc7 11.Rc1 a6 12.e5 Ng8 13.Ng5 Ne5? (13...c5 14.Nce4 Be4 15.Ne4 cb4 16.Be6 Qb7+–) 14.de5+– Qe5 15.Nge4 f5 (15...a5 16.b5 Rd8+–) 16.Qh5 g6 17.Qe2 (17.Qe2 fe4 18.Ne4+–) 1–0. pcmvr – mgilbert, net–chess.com, 2020.

3.a3 e6

4.d3 a5 5.Nd2 ab4 6.ab4 Ra1 7.Qa1 Qb4?? 8.Bg7+– f6 9.Bh8 Na6 10.Ngf3 Qe7 11.e4 Nb4 12.Qb2 Qf7 13.Be2 Be7 14.e5 Nc6 15.0–0 Nh6 16.ef6 Bd6 17.c4 Qh5 18.Re1 Ng4 19.h3 (19.h3 Nh6 20.d4+–) 1–0. pierre – thzen, internet, 2010.

4.d3 d4 5.Nf3+= e5 6.Nbd2 (6.c3 dc3 7.Nc3 Nc6+=) 6...Be7 (6...Be6!?=) 7.Nc4+– Qf6 (7...Qd8 8.Nce5 f6 9.Nc4+–) 8.c3 (8.Nce5 c5+–) 8...Nd7 (8...b5!? 9.Nce5 Qd6+–) 9.cd4 ed4 10.Bd4 Qg6 11.e4 (11.Rc1 Nh6+–) 11...Ngf6 (11...Nh6 12.Ne3+–) 12.Be2 (12.Nh4 Qg5 13.Nf5 Bf8+–) 12...0–0 (12...b5 13.Ne3 c5 14.bc5 Bc5 15.Bc5 Nc5 16.Rc1+–) 13.Nh4 b6?? (better 13...Qg5 14.Nf5 Re8+–) 14.Ng6 (14.Ng6 fg6 15.Bf3+–) 1–0. Janek – muffed, internet, 2016.

4.d3 Nd7!? =.

4.d3 Nf6 5.Bf6 gf6 6.e3 Nc6 (6...e5 7.Nf3=) 7.Qf3 (7.d4 e5=) 7...Bg7 (7...e5 8.c4 d4 9.Nd2=) 8.Qg4 (8.d4 e5=) 8...Rg8+= 9.Qh5 (9.Qh4 h6+=) 9...h6 (9...Qe5 10.Qe5 fe5 11.c3+=) 10.Qg4?? (better is 10.Nf3+=) f5–+ (10...f5 11.Qg3 Qg3 12.hg3 Ba1 13.Rh6 d4–+) 0–1. Berserk – Wall,Bill, internet, 2004.

4.e3 Nd7 5.Nf3 f6 (5...Ngf6 6.Nc3+=) 6.Be2 Be7 7.0–0 b6 (better is 7...Nh6!?+=) 8.c4+/– Bb7 9.d4 Nh6? (better is 9...dc4!? 10.Bc4 a5+/–) 10.c5+– bc5 11.bc5?? (better is 11.dc5 Nc5 12.bc5 Qc5 13.Nc3+–) 11...Qc6+= 12.Nc3 Ba6 13.Ba6 Qa6 14.Re1 0–0 15.e4 de4 16.Ne4 Nf7 17.Nfd2 Rfd8 18.Qe2 Qa4 19.Qc4 Qc6 20.a4 Kh8 21.Qb5 Qd5 22.c6 Nb6 23.Qd5 Nd5 (worse is 23...ed5 24.Ng5 Re8 25.Nf7 Kg8 26.a5+/–) 24.Ba3 Ba3 25.Ra3 Nb4 26.Rc1? (better is 26.Rc3!?+=) 26...Rd4–+ (26...Rd4 27.f3 Rad8–+) 0–1. cmulligan (2085) – johnb (2280), net–chess.com, 2014.

4.Nf3 Nd7 =.

4.Nf3 Nf6 5.Be5 Qd8 6.Nc3 c5 7.Nb5 Na6 8.Nc3 (8.e3!?=) 8...cb4=+ 9.ab4 Bb4 (9...Nb4? 10.Nb5 Bd7 11.Nc7 Ke7 12.c3+/–) 10.Nb5 0–0 11.c3 Bc5 12.e3 Ng4 13.Bg3 h6 14.Bh4 Be7 15.Bg3 Bd7 16.h3 Nf6 17.Qc2 Ne4 18.Ne5 (better is 18.Bf4!?–/+) 18...Ng3–+ 19.fg3 Bb5 20.Bb5 Bd6 (20...Nc7 21.Ba4–+) 21.Nf3 (21.Ba6 ba6 22.Ng4–+) 21...Bg3 22.Ke2 Nc5 23.c4 dc4 24.Bc4 Qc7 25.Nd4 (25.Rhc1 Qd6–+) 25...Qe5 (25...Be5 26.Rhc1–+) 26.Rhf1 Rfd8 27.Ne6?? (better is 27.Nf3 Qh5 28.d4–+) 27...Ne6 28.Bd3 Nd4 (29.Kd1 Nc2 30.Kc2 Rd3–+) 0–1. Daringer – Wall,Bill, internet, 2004.

3.a3 Bf5

4.d3 e5 5.Nc3 a6 (better is 5...Nf6!? 6.Nf3 Nc6+=) 6.e4+= de4 7.de4 Be6 8.Nf3 Nc6 9.Be2 (9.b5 Nd4 10.Nd4 ed4=) 9...f6 (9...Nf6!?=) 10.0–0+= Qd1 11.Rfd1 Nh6 12.Nd5 Bd6 13.c4 Rc8 14.c5 Be7 15.Ne3 (15.Ne7?! Ke7 16.Rd2 Rhd8+=) 15...0–0 16.Rac1 Nf7 17.Nd5 Rfe8 18.Ne7 (18.Bc4!?+/–) 18...Re7 19.Nd2 (19.Bc3!?+=) 19...Rd7= 20.Nc4 Rcd8 21.Ne3 Nd4 22.Bd4 Rd4 23.Rd4 ed4 24.Nf5? (better is 24.Nd5 c6 25.Nf4=) 24...d3–+ 25.Bf3? (25.Bd1 Ne5–+) 25...Ne5 (25...d2 26.Rd1 Ne5 27.Be2–+) 26.Ne3? (better is 26.Bd1–+) 26...d2 27.Ra1 Nf3 28.gf3 Bb3 29.Nd1 Rd3 30.Kg2 Kf7 31.f4 Rd4 32.f3 Rc4 33.Rb1 Ba4 34.Ne3 (34.Rb2 Bd1 35.Rd2–+) 34...Rc1 35.Rb2 d1Q (35...d1Q 36.Nd1 Rd1–+ (worse is 36...Bd1 37.Rd2–+)) 0–1. cristero (2310) – noahsark (2360), net–chess.com, 2015.

4.d3 f6 5.Nc3+– e5 6.e4 de4 7.de4 Qd1 8.Rd1 Be6 9.Nb5 (9.Nd5 Bd5 10.Rd5 Ne7+–) 9...Na6+= 10.f4 (10.Nf3 Nh6+=) 10...c6? (better 10...ef4!? 11.Ne2 g5+=) 11.Nd6+– (11.Nd6 Bd6 12.Rd6+–) 1–0. objorn (2420) – eric2800 (1850), gameknot.com, 2017.

4.e3 a6 5.c4 dc4 (5...Nf6!?=) 6.Qf3+= Be6 (6...Bc8!? 7.Bc4 Nf6+–) 7.Qb7+– Qc6 8.Qc6 Nc6 9.Nf3 f6 10.Be2 (10.d4 cd3 11.Bd3 Bd7+–) 10...Bf7 (10...Nh6!?+–) 11.0–0 e5 12.Nc3 (12.Rc1 Bd6+–) 12...Bd6 (12...0–0–0 13.Rac1+–) 13.Ne4 Nge7 14.Rac1 0–0 15.Bc4 a5 (better 15...Bc4!? 16.Rc4 Rfb8+–) 16.b5+– Nd8 (16...Bc4 17.Rc4 (17.bc6? Bf1 18.Kf1 Rab8–+) 17...Rfb8 18.a4+– (18.bc6?! Rb2 19.d4 Ba3+=; 18.Nd6?! cd6 19.a4 Nb4+–)) 17.d4 Nd5 (17...Bc4 18.Rc4 Nf7 19.de5 fe5 20.Rd1+–) 18.de5 (18.Be2 ed4 19.Nd6 d3 20.Bd3 cd6+–) 18...fe5 19.Ne5 Nf6 (19...Be5 20.Be5 Re8+–) 20.Nf6 gf6 21.Nd7 Bc4 22.Rc4 Rf7 23.Nf6 Kf8 24.Rh4 (24.Ne4 Ne6+–) 24...Rb8 (24...Ne6 25.Rh6+–) 25.Nh7 Kg8 (25...Ke8 26.Nf6 Ke7 27.Ng8 Kd7+–) 26.Ng5 Kf8 (26...Rg7 27.Bg7 Kg7 28.a4+–) 27.Rh8 Ke7 28.Nf7 Kf7 29.a4 Ke7 (29...Nc6 30.Rb8 Nb8 31.Bc3+–) 30.Bc3 Rb6 (30...Rb7 31.Rh7 Nf7 32.f4+–) 31.Ba5 (31.Ba5 Rb7 32.Bc3+–) 1–0. DEFFM – GuestYRPX, freechess.org, 2020.

4.e3 c6 5.Nf3 Nd7 6.Be2 e5 7.d4 e4 8.Nfd2 Ngf6 (8...Qg6 9.g4 Be6 10.h4=+) 9.c4= Be7 10.Nc3 0–0 11.Rc1 a6 12.h3 Rae8?? (12...a5 13.ba5 Ra5 14.cd5 cd5 15.Qb3=) 13.cd5 (13.g4 Be6 14.g5 Kh8+–) 13...cd5? (13...Nd5 14.Nde4 Be4 15.Ne4+=) 14.Na4?? (better 14.g4 Be6 15.g5+–) 14...Nb8 15.Nc5 Bc8 16.Ndb3 Bd8 (16...b6 17.Na4=) 17.g3 (17.Na6!? Bh3 18.Rh3 Na6 19.Nc5 Nc5 20.dc5+– (20.Rc5?! Bc7=)) 17...Bb6 (17...Be7 18.b5=+) 18.h4 h6 (18...Bc7 19.b5=+) 19.Qd2 (19.g4 Nh7+=) 19...Nh7 (19...Re7 20.b5=) 20.Na4 (20.b5 ab5 21.Bb5 Nc6=) 20...f5 (20...Bc7!?=) 21.Nb6+= Qb6 22.Qc3 Nf6 23.Qc5 Qe6 24.Qc7 Nc6 (24...Nbd7!?+=) 25.Nc5+– Qe7 26.Qe7 Ne7 27.Na4 Bd7 28.Nb6 Bc6 29.a4 Nc8 30.Nc8 Rc8 31.b5 Bd7 32.Kd2 Rc1 33.Rc1 (worse 33.Kc1 Rc8 34.Kd2 ab5 35.ab5 Ne8=) 33...ab5 34.ab5 Kf7 35.Ba3 (35.Ba3 Ra8 36.Bd6=). BeepBeepImAJeep (2660) – Nimrod64 (2325), lichess.org, 2015.

4.e3 Nc6 5.b5 Ne5 6.Be5 Qe5 7.d4 Qe4 8.c4 Qc2 (8...dc4!? 9.Nf3 e6=) 9.Qc2+– Bc2 10.cd5 0–0–0 11.Nc3 e6 (11...Nf6 12.Nf3+–) 12.de6 fe6 13.Nf3 Bd6 (13...Nf6 14.Ng5 Re8 15.Bc4+–) 14.Kd2 (better 14.e4!? e5 15.de5+–) 14...Bg6 15.Bd3 Nf6 (15...Bd3 16.Kd3 Nf6 17.Ng5+–) 16.Bg6 hg6 17.h3 (17.Ng5 Rhe8+–) 17...Rhe8 18.Rhd1 Kb8 19.Ke2 c6 20.a4 cb5 21.Nb5 Bf8 22.Rac1 a6 23.Ne5?? (better 23.Nc3+–) 23...ab5= 24.Ng6?? (better 24.ab5 Rd5 25.Rb1=) 24...ba4–+ 25.Rc4 Rc8 26.Ra4 Rc2 (better 26...Ne4!? 27.Rd3 Nc3 28.Rc3 Rc3–+) 27.Rd2 Rd2 28.Kd2 Rc8 (28...Ne4!? 29.Ke1 b5–/+) 29.Kd3=+ Nd5 30.Ra5 Rc3 31.Kd2 (better 31.Ke2 Rc2 32.Kf3–/+) 31...Rc8?? (better 31...Bb4!? 32.Rb5 Ra3 33.Kc2 Be1–+) 32.Nf8 (better 32.Kd3!?=) 32...Rf8–/+ 33.e4 Nf4 (33...b6 34.Ra3 Rf2 35.Ke1 Rg2 36.ed5 ed5 37.Kf1–/+) 34.Rg5=+ Rf7 35.Ke3 Nh5?? (better 35...Kc7=+) 36.e5?? (better 36.Rh5 Kc7 37.f4+–) 36...g6?? (36...Nf4 37.Ke4–/+) 37.g4?? (37.g3 b5 38.Rg6 Ng7+=) 37...Ng7?? (37...Nf4 38.Ke4 b5–+) 38.Rg6+– Ne8? (38...b5 39.Rf6 Rc7+–) 39.Re6 Nc7 40.Rd6 Rg7 (40...Kc8 41.g5+–) 41.Rd8 Ka7 42.f4 Rf7 43.f5 Rh7 44.Rd7 (better 44.e6+–) 44...Rh3?? (better 44...Rd7 45.h4 Kb6–+) 45.Kf4 (45.Kf4 Kb6 46.f6+–) 1–0. RichardSommer (2145) – Muratgiresun (2110), lichess.org, 2020.

4.e3 e5 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.e3 Bf5).

4.Nf3 a5 =.

4.Nf3 Nf6 5.e3 Nbd7 6.Bb5 c6 7.Ba4 e5 8.c3 Nb6 9.Bb3 0–0–0 10.d3 Bg4 11.h3 Bh5 12.g4 Bg6 Black prepares e4 13.Bc2 (13.Nh4 Qe6=+) 13...Qe6 Black plans e4 14.Ng5 (14.Nbd2!?=+) 14...Qe7–/+ 15.Nf3 e4 16.Nd4 Nc4?? (better 16...h5 17.g5 ed3 18.Bd3 Bd3 19.Qd3 Ne4–/+) 17.dc4+– dc4 18.Nd2 c5 (18...h5 19.g5 (19.Nc4?! hg4 20.h4 Rd5+–) 19...Nd5 20.Qb1+–) 19.bc5 Qc5 20.a4 (20.h4 h6+–) 20...Nd5 (20...h5 21.gh5 Bh5 22.Qb1+–) 21.Qe2 h5 22.g5 Bd6 (22...Nc7 23.Rg1+–) 23.h4 (23.Be4!? Rhe8 24.Bg6 fg6 25.Qc4 Qc4 26.Nc4 Bf4+–) 23...Rhe8 24.Nc4 Be5 25.Ne5 Re5 26.Bb3 (26.Nb3 Qf8+–) 26...Kb8 27.Rc1 Qb6 28.Ba3 Qb3 (28...f6+–) 29.Nb3 1–0. alessandrocarvalhaes (1715) – Alik80 (1745), lichess.org, 2018.

4.e3 Nd7

5.Nf3 0–0–0 6.Nc3 a6 7.Be2 Ngf6 8.0–0 Ne4 (8...e5 9.Rb1=) 9.d3 Nc3 10.Bc3 e5 11.Nh4 (11.a4 Be7=) 11...Be6 12.Bg4 Bg4 13.Qg4 Kb8 14.Bd2 Nf6 15.Qe2 g6 16.Nf3 Bh6 17.c4 e4 18.c5? (18.de4 Ne4 19.Rac1 dc4=) 18...Qe6?? (better is 18...ef3 19.Qf3 Qe6–+) 19.Nd4+= Qe5 20.Bc3 ed3 (20...Qg5 21.b5 ab5 22.Rfb1+/–) 21.Qd3 (21.Qf3 Qe7 22.Nc6 bc6 23.Bf6 Qe6+–) 21...Qe8 (21...Qe4 22.Qe2 Qg4 23.Qb2+–) 22.a4 White prepares the advance b5 (22.Nf5 Bg5 23.f4 d4 24.Nd4 Bh6+/–) 22...Ng4 23.Bd2 (23.b5!? Ne5 24.Qb1+–) 23...Ne5 (23...Bg7 24.Rfd1=) 24.Qb3+= Qe7 25.b5 Qc5 26.ba6 b6?? (better is 26...Qb6!? 27.Qb6 cb6+/–) 27.f4 (better is 27.Rfc1!? Qd6 28.Nb5+–) 27...Nc6 28.Nc6 Qc6 29.a5 (29.Rfc1 Qe6+–) 29...b5+/– 30.a7 Ka7 31.Rfc1 Qe6?? (better is 31...Qd7+/–) 32.Qb5+– (worse is 32.Rc7 Ka6 33.Qc3 Rc8+–) 32...Rb8 (32...c5 33.Rc5 Rc8 34.Rd5 Ka8+–) 33.Rc7 Ka8 34.Qc5 Qa6 (34...Rb7 35.Rb7 Kb7 36.Rb1 Ka8 37.Qb5 Qc8 38.Qd5 Ka7 39.a6 Qa6 40.Qd4 Ka8 41.Qh8 Bf8 42.Qf8 Qc8 43.Qc8 Ka7 44.Qb7) 35.Qd5 Rb7 36.Rac1 (36.Rb1 Rhb8 37.Rbb7 Rb7 38.Rc8 Ka7 39.Qd4 Qb6 40.ab6 Rb6 41.Rc7 Ka8 42.Qd5 Kb8 43.Qd8) 36...Rhb8 37.Rb1 Bf8 (37...Bf4 38.ef4 Qa7 39.Kh1 g5 40.Rbb7 Qb7 41.Rb7 Rb7 42.a6 gf4 43.Qb7) 38.Rbb7 Rb7 (38...Qf1 39.Kf1 Rb7 40.Qb7) 39.Rf7 (39.Rc8 Ka7 40.Qd4 Rb6 41.ab6 Qb6 42.Rc7 Ka8 43.Qd5 Qc6 44.Qd8) 39...Ba3+– 40.Rh7 Ka7 41.Rb7 (better is 41.Qd4!? Ka8 42.Qe4 Ka7 43.Rb7 Qb7 44.Qg6 Bc5+–) 41...Qb7 42.Qb7 Kb7 43.Bc3 (43.g4 Kc6+–) 43...Bc5 44.Bd4 Bb4 45.Bb6 Ka6 46.e4 Kb7 47.e5 Be7 48.Kf2 Ka6 49.g4 Bh4 (49...Kb7 50.f5 gf5 51.gf5 Bh4 52.Kf3+–) 50.Ke3 Be1 51.Ke4 Ba5 (51...Kb7+–) 52.Ba5 Ka5 53.e6 Kb6 54.e7 Kc7 55.e8Q Kd6 56.Qg6 Ke7 57.Kd5 Kf8 (57...Kd7 58.Qf7 Kd8 59.Kc6 Kc8 60.Qe8) 58.Qh7 Ke8 59.Kd6 (59.Ke6 Kf8 60.Qf7) 59...Kf8 60.Ke6 Ke8 61.Qh8 1–0. Trkn – Blommaert Eddy, itsyourturn.com, 2000.

5.Nf3 e5 6.c4 a5 7.c5 Qe7 8.Bb5 =.

5.Nf3 e5 6.c4 c6 7.cd5 (7.d4 e4 8.Ne5 Ngf6=) 7...cd5 8.Nc3 a6 (8...Rc8 9.d4 e4 10.Nb5=) 9.Nh4 (9.d4 e4 10.Nh4 Be6=+) 9...Be6 10.Be2 (10.d4 Rc8=) 10...Be7 11.Nf3 Ngf6 12.0–0 d4 13.b5?? (13.ed4 ed4 14.Nb1–/+) 13…d3–+ (14.Rc1 0–0–+) 0–1. Moehring,Nicholas – Paris,Michael, St Ingbert op, 1991.

5.Nf3 e5 6.c4 d4 7.c5 (7.ed4 e4 8.Nh4 Bg6+–) 7...Qd5 (better 7...Qe6!?=) 8.ed4+– ed4 9.Bd4 Bb1 10.Rb1 Qe4 (10...0–0–0 11.Qc2 Re8 12.Be3+–) 11.Be2 Ngf6 (11...0–0–0 12.0–0+–) 12.0–0 Be7 13.Re1 0–0?? (13...Qg6+–) 14.Bb5 Qd5 15.Re7 g5 (15...c6 16.Ba4 a5 17.ba5 Ra5 18.Bb3+–) 16.Bd7 (16.Qc2 g4 17.Bc4 Qh5+–) 16...Nd7 17.Qc2 (17.Qb3 Qf5+–) 17...g4 18.Rd7! Qd7 19.Ng5 f6 20.Qc4 Kg7 (20...Kh8 21.Ne6+–) 21.Ne4 (better 21.Ne6 Kh8 22.Nf8 Rf8+–) 21...Rad8 22.Bc3 Rfe8 (22...Qd3 23.Qd3 Rd3 24.c6 bc6 25.Re1+–) 23.d3 (better 23.Nf6 Qf5 24.Ne8 Kf8 25.Bg7 Ke8 26.Re1 Kd7+–) 23...Kg6?? (better 23...Qd3 24.Qd3 Rd3 25.Nf6 Re6 26.Nd5 Kf7 27.Nc7 Rc3 28.Ne6 Ke6+–) 24.Nf6 Qd3 25.Qg4 (25.Qg4 Kf7 26.Qh5 Qg6 27.Qg6 hg6 28.Ne8 Re8 29.Rd1+–) 1–0. GuestBFQC – GuestSFFJ, freechess.org, 2017.

5.Nf3 e5 6.d4 e4 7.Ne5 Ne5 8.de5 Qc6 =.

4.e3 Nf6

5.Nf3 Nbd7 6.Be2 e6 7.Nc3 c5 8.bc5 Qc5 9.Nh4 Bg6 10.Ng6 hg6 11.a4 Qa5 12.Nb5 a6 13.Nd4 Nc5 (13...Qc7 14.h3=) 14.c3 (14.Nf3 Nce4= (14...Na4? 15.Bf6 gf6 16.c4+–)) 14...Bd6 15.h3 e5 16.Nb3 Qb6 17.Nc5 Bc5 (< 17...Qb2 18.Rb1 Qa3 19.Nb7+/–; < 17...Qc5 18.Ba3 Qc6 19.Bd6 Qd6 20.Rb1=) 18.Rb1 Qc6 19.f3 (19.a5 Bd6=) 19...Rh4 20.Qb3 (better is 20.c4!? dc4 21.Be5=) 20...Ra4 (< 20...Qa4 21.Qb7 Rd8 22.g3+/–) 21.Bc1 (21.0–0!?–/+) 21...b5–+ 22.Bd1 Rd8 (better is 22...Bd6!?–+) 23.0–0 Nh5 (better is 23...Kf8!?=+) 24.Qb2 Rh4 25.d4 ed4 26.ed4 Bd6 27.Bg5 Bg3 28.Qe2 Qe6 29.Qe6 (29.Bh4 Qe2 30.Be2 Bh4=) 29...fe6 30.Bd8 Kd8 31.Ra1 (31.Rb3 e5 32.de5 Ra4=) 31...e5 32.Ra6 ed4 33.cd4 Rd4 34.Rg6 Bf4 35.g4 (35.Bc2!?+/–) 35...Be3= 36.Kh2?? (better is 36.Kh1 Ng3 37.Kg2 Nf1 38.Kf1=+) 36…Rd2 (37.Be2 Re2 38.Rf2 Rf2 39.Kg1 Re2 40.Kf1 Ng3#) 0–1. Toth,Tamas (1900) – Hidegh,Gabor (1910), Sarospatak–ch, 2000.

5.Nf3 e6 6.c4 Be7 7.cd5 ed5 (worse 7...Qd5 8.Nc3 Qd8 9.Be2+=) 8.Nc3 Nc6 9.Nb5 Qd7 10.Rc1 (10.Ne5 Ne5 11.Be5 0–0 12.Nc7 Rac8=) 10...0–0= 11.Ne5 Ne5 12.Rc7 Qe6 13.Nd4 ½–½. marekt (2165) – ilbepi (2215), gameknot.com, 2017.

4.Nf3 Nd7

5.d4 Ngf6 6.e3 c6 7.c4 dc4 8.Bc4 b5 9.Be2 e6 10.0–0 Be7 11.Nh4 Bg6 12.Nd2 a5 13.ba5 Ra5 14.Ng6 hg6 15.g3 Nd5 (15...Nb6 16.Qc2 Na4 17.Rfb1=) 16.Qc2+= f5 17.Rfc1 Kf7 (better is 17...Nb8!?+=) 18.Qc6+– Qc6 19.Rc6 Rha8 20.Nb3 Ba3 21.Na5 Bb2 22.Rb1 Bd4 23.ed4 Ra5 24.Bb5 N7f6 25.Bc4 Ra7 26.Re1 Re7 (26...Ne4 27.Kg2+–) 27.f3 (27.h4 Ne4+–) 27...g5 28.h3 f4 29.Re5 fg3 30.Rg5 Rc7 (better is 30...Nf4 31.Rg3 N6h5+–) 31.Bd5 Nd5 32.Rc7 Nc7 33.Kg2 Nd5 34.Rd5 (worse is 34.Kg3 Ne7+–) 34...ed5 35.Kg3 Kf6 36.Kf4 (36.Kf4 g5 37.Kg4+–) 1–0. Timmermans,M (2285) – Duinmaijer,M (1845), Vlissingen NED, HZ Open, 2013.

5.d4 Ngf6 6.e3 e6 7.Nbd2 Ne4 8.Nh4 Be7 9.Nf5 ef5 10.Be2 0–0 11.0–0 f4 12.Ne4 de4 13.ef4 Qf4 14.g3 Qd6 15.c4 f5 Black plans f4 16.f3 f4? (16...Bg5 17.Qb3 Qe6 18.fe4 fe4 19.d5 Qb6 20.Kg2+=) 17.g4 (better is 17.Qb3 Qg6 18.fe4 fg3 19.Qg3 Qe4 20.Bf3+/–) 17...e3= 18.Qb3 Qh6 19.Kg2 Kh8 20.Bc3 Rad8 21.Rad1 Bh4 22.Rh1 Qg5 23.d5 Nf6 24.b5 ½–½. Madanasri,G (1995) – Vaibhav,K (1860), Parsvnath ch–Commonwealth, New Delhi IND, 2007.

5.e3 a6 6.Be2 f6 (6...Ngf6 7.Nc3+=) 7.Nd4 (7.0–0 Nh6+=) 7...Bg6 8.c4 c5 9.bc5 Nc5 10.cd5 e5? (better is 10...Qd5 11.0–0 e5+=) 11.de6!+– Ne6 (11...Ne7 12.0–0+–) 12.Qa4 Kf7 (12...Kd8 13.0–0+–) 13.Ne6 Ke6 (13...b5 14.Bb5! ab5 15.Qa8 Qe6+–) 14.Qb3 Kf5 (14...Kd7 15.Qb7 Qc7 16.Qa8 Ne7+–) 15.h4 (15.e4 Kg5 16.h4 Kh6 17.Qe3 Qf4 18.Qf4) 15...Nh6 16.Bd3 (16.Bd3 Qd3 17.Qd3 Ke6 18.Qb3 Kd7 19.Qb7 Ke6 20.Qa8+–; 16.e4 Ke4 17.Qf3) 1–0. Lein,Marina (1925) – Afanasieva,Elena, Seniors Russian Championship Women, 2011.

5.e3 c6 6.d4 (6.Nh4 Bg6+=) 6...Ngf6= 7.Nbd2 (7.c4 Rd8=) 7...e6 8.c4 (8.Nh4 Bg4 9.f3 Bh5=) 8...Be7 9.c5 Qc7 10.a4 (10.Be2 a5=) 10...0–0 11.Bc3 (11.Be2 a5=) 11...Ne4 (11...b6 12.Be2=) 12.Ne4 Be4 (12...de4 13.Nd2=) 13.Be2 (13.Bd3 a5 14.Be4 de4=) 13...Bf6 (13...Nf6 14.Qd2=) 14.0–0 Bf3 (14...e5 15.de5 Ne5 16.Be5 Be5 17.Ne5 Qe5 18.a5=) 15.Bf3 e5 ½–½. Rieck_Perschonke,Ingvar – Zornow,Thomas, Schleswig Holstein–ch, 1993.

5.e3 Ngf6 6.c4 c5 7.bc5 Qc5 8.d4 Qb6 9.c5?? (better is 9.Ra2=) 9...Qb2–+ 10.Nbd2 Bc2 11.Qc1 Qc1 12.Rc1 Bf5 13.Bb5 e6 14.Ne5 Rd8 15.Ndf3 a6 16.Ba4 Be4 17.Nd7 Nd7 (17...Rd7?! 18.Rc3 Bf3 19.gf3–/+) 18.Ne5 Bg2 19.Rg1 Be4 20.Ke2 Ke7 21.Nd7 Rd7 22.Bd7 Kd7 23.Rc3 g6 24.Rgc1 h5 25.a4 Kc6 26.Rb3 e5 27.Rb6 Kc7 28.a5 ed4 29.ed4 Bh6 30.Rc3 Re8 31.Kf1? (31.c6 bc6 32.Rbc6 Kd8 33.Ra6 Bg2 34.Kd1 Bg7 35.Ra8 Kd7 36.Re8 Ke8–/+) 31...Bd2 32.Rcb3 Rb8 33.c6 Ba5 34.Rb7 Rb7 35.Rb7 (35.cb7 Kb8 36.Ke2–+) 35...Kc6 36.Rf7 Bc3 37.Rf6 Kb7 (better is 37...Kb5!? 38.Ke2 Bd4 39.Rf7–+) 38.Ke2 Bd4 (39.Re6 Bf5–+) 0–1. hal1958 – trousersnake, HCL–A1536 playchess.de, 2003.

5.Nh4 Be6 =.

5.e3 e5

6.Nc3 a6 =.

6.Nc3 c6 7.Be2 =.

6.Be2 0–0–0 7.d4 Qg6 8.Nh4 +=.

6.Be2 Be7

7.Nc3 0–0–0 =+.

7.d3 Ngf6 8.0–0 =+.

7.d3 Ngf6 8.c4 dc4 9.dc4 Qd1 10.Bd1 a5 +=.

7.d3 Ngf6 8.Nbd2 0–0 (8...a5 9.c4 ab4 10.ab4+=) 9.c4= c6 10.Qc2 Rfe8 11.e4 (11.c5 Qc7=) 11...Be6 Black intends d4 (11...Bg4 12.0–0=) 12.0–0 d4 13.Ng5 Bg4 14.c5 Qc7 (14...Qb8 15.Bg4 Ng4 16.Ngf3=) 15.f3 (15.Qb3!? Rf8 16.Bg4 Ng4 17.Ne6 fe6 18.Qe6 Rf7 19.Qg4+/–) 15...Bh5= 16.Nh3 (16.g4 h6 17.Nh3 Bg6=) 16...Rad8 (16...a5 17.Nb3=) 17.Bc1 (17.g4 Bg6+=) 17...h6 18.Nc4 g5 (18...b5 19.cb6 ab6 20.g4=) 19.Nf2 Bg6 (19...b5 20.Nd2=) 20.Ng4 Kh7 (20...Ng4 21.fg4 b6=) 21.h4 (better is 21.Nf6!? Nf6 22.h4+=) 21...Ng4+= 22.h5 (22.fg4 gh4 23.Qd2 Bg5+=) 22...Bh5–/+ 23.fg4 Bg6 24.Bd2 Nf6 (24...b6 25.cb6 ab6 26.a4–/+) 25.Bf3 Bf8 26.Kf2 (26.Rf2 Qd7–/+) 26...Qd7 27.Kg3 b5 (better is 27...Kg7!?–/+) 28.cb6= ab6 29.Nb6 Qc7 30.Nc4 Rd7 (30...Rb8 31.Rab1=) 31.Rh1 Kg7 32.a4 (32.Kh2 Rb8=) 32...Rb8 33.Rab1 Ng8 (33...Nd5 34.b5 (34.ed5 Bd3 35.Qd3 e4 36.Kf2 ed3 37.dc6 Re7+=) 34...cb5 35.ab5=) 34.a5 f5? (34...Rb5 35.Kh2+=) 35.Nb6 (35.gf5 Bf5 36.Nb6 Rf7+–) 35...Rf7? (better is 35...f4!? 36.Kh2 Rb6 37.ab6 Qb6+=) 36.gf5+– (worse is 36.ef5 Bf5 37.gf5 e4 38.Kf2 ef3=) 36...Bf5 37.Bh5 (better is 37.b5 Ne7 38.Bh5+– (38.ef5?! e4 39.Kf2 ef3+/–)) 37...Be4?? (better is 37...Bg6+/–) 38.de4+– (38.Bf7 Bd3 39.Qb2 Qf7–/+) 38...Re7 39.Rbc1 (39.Rhc1 Nf6 40.Bf3 c5+–) 39...Nf6 40.Bg4 (40.Bf3 Re6+–) 40...c5 (40...Ng4 41.Kg4 Re6 42.b5+–) 41.Rhf1 (41.Bf5 Rf7+–) 41...Qc6 42.Rf6! Qf6 (42...Qf6 43.Nd7 Double attack (43.Nd7 Decoy); 42...Kf6 43.Nd5 Double attack) 43.Nd5 (43.bc5?! Rf7 44.c6 Qf2 45.Kh2 Bd6+–; 43.Qc5 Rf7 44.Qb5 Qf2 45.Kh2 Rb6 46.ab6 Qd2 47.Qe5 Kg8+–) 43...Qg6 44.Ne7 Be7 45.bc5 h5 (45...Rb7 46.c6 Rc7 47.a6+–) 46.Bf5 (better is 46.Bd7 Bd8+–) 46...Qf6 (46...Qc6 47.Qa2+–) 47.Rb1 (better is 47.c6!? g4 48.Rh1 h4 49.Kg4 Rc8+–) 47...g4 (47...Rb1 48.Qb1 Bc5 49.Qb7 Qe7 50.a6 Qb7 51.ab7+–) 48.Kf2 (48.Rh1 h4 49.Kg4 Rc8+–) 48...Qh4 49.Ke2 Rd8 (49...Rb1 50.Qb1 Bc5 51.Qb7 Qe7 52.Qc6+–) 50.Kd3 (50.Kd1 Qh1 51.Be1 Bh4+–) 50...Qg3 51.Kc4 d3 (51...Qa3 52.Qb3 Qc5 53.Kd3 Qd6+–) 52.Qb2 Rd4 53.Kb5 (53.Kc3!? Qh4+–) 53...Rd8 54.Kc6 (better is 54.Qa2 Qh4 55.Qe6+–) 54...Bc5 (54...Rf8+–) 55.Qb7 Kf6 (55...Be7 56.Qe7 Kg8 57.Qd8 Kg7 58.Rb7) 56.Bh6 (56.Bg5 Kg5 57.Qg7 Kh4 58.Qf6) 56...Bf8 57.Bf8 (57.Qh7 Rd6 58.Kc7 Bh6 59.Qh6 Kf7 60.Qh7 Kf6 61.Kd6 Kg5 62.Qg7 Kh4 63.Qf6) 57...Rf8+– 58.Qd7 (58.Qh7 Qh2 59.Qg6 Ke7 60.Qe6 Kd8 61.Rb8) 58...Kg5 (58...Qg2 59.Kd6 Kg5 60.Qg7 Kf4 61.Qf8 Qc2 62.Bg4 Ke3 63.Qh6 Kd4 64.Rb4 Kc3+–) 59.Qg7 Kf4 (59...Kh4 60.Qe7 Rf6 61.Qf6) 60.Qh6 1–0. Haag,Guenter (2190) – Meinhardt,Roland, Eisenberg RLP–ch MTB, 1998.

7.d3 h6 8.Nbd2 Ngf6 9.0–0 (9.c4 a5=) 9...c6 (9...a5 10.c4 0–0 11.d4=) 10.c4 (10.e4 Be6=) 10...0–0 11.Qb3 (11.d4 e4 12.Ne5 Rfd8=) 11...Be6 (11...Qe6 12.d4 e4 13.Nh4=) 12.c5 Qc7 13.Qc3 ½–½. Stein,Werner – Rahner,Fritz, Baden–ch JS Karlsruhe, 2003.

3.a3 Nf6

4.Nc3 c6 5.e3 a5 6.b5 a4 (6...e5 7.Be2=) 7.bc6 bc6 (7...Qc6?? 8.Bb5+–) 8.f4 Bg4 9.Be2 h5 10.Nf3 e6 11.h3 Bf5 12.Bd3 Bd3 13.cd3 Be7 (13...Qc5 14.Na4 Qb5 15.Rb1+=) 14.0–0 0–0 15.Na4 Nbd7? (better is 15...c5+/–) 16.Be5+– Ne5 17.fe5 (17.Ne5?! c5+=) 17...Qd7 (17...Qc7 18.ef6 Bf6 19.d4+–) 18.ef6 (18.Nb6 Qb7 19.Na8 Nh7+–) 18...Bf6 19.Nc5 Qa7 20.d4 Be7 (20...Rfb8 21.a4+–) 21.Ne5 Bc5 22.dc5 Qc5 23.Nd7 Qa7 (23...Qa5 24.Nf8 Rf8 25.d4+–) 24.Nf8 Rf8 25.Qh5 g6 26.Qe5 c5 27.a4 Rb8 28.Rf4 Rb4 29.Rb4 cb4 30.a5 b3 (30...d4 31.Qd4 Qd4 32.ed4+–) 31.a6 Kh7 32.Ra4 Qb6 33.Rh4 Kg8 34.Qh8# (34.Rh8#) 1–0. Fritz 10 – NN, 2007.

4.d3 e5=+ 5.Nf3 Nc6 6.b5+= e4 7.de4 de4 8.Qd6 Bd6 9.Bf6 ef3 10.Bg7 fg2= 11.Bg2 Rg8 12.bc6 b6 13.Nc3 Rg7 14.Nd5?? Rg2–+ 15.Nf6 Kd8 16.Nh7 Bf5 (16...Bf5 17.Nf6 Bc2–+ (17...Bh2?! 18.Nd5 Be4 19.Ne3–/+; < 17...Rh2 18.Rh2 Bh2 19.e4–+); 16...Bh2?! 17.Nf6–+; < 16...Rh2 17.Rh2 Bh2 18.Nf6–+) 0–1. jearly (2210) – mgoodrich (2080), net–chess.com, 2008.

4.d4 Bg4 5.Nd2 Nc6 6.Ngf3 Bf3 7.Nf3 Nb4 8.e3 (8.ab4 Qb4 Theme: Double Attack) 8...Nc6 9.c4 dc4 10.Bc4 e6 11.Qa4 (11.Qc2 a6=) 11...Be7 12.Bb5 0–0 13.Bc6 Qc6 (13...bc6 14.Rc1=+) 14.Qc6 bc6 15.Rc1 (15.Ne5!?=) 15...Rfb8=+ 16.Rc2 Rb3 17.Nd2 Rb5 18.Ke2 Rab8 19.Nc4 Kf8 (19...Ne4 20.Rd1=+) 20.Ra1 (20.Rd1 Bd6=+) 20...c5 21.a4 (21.dc5 a6=+) 21...Rb4–/+ 22.Ra2 cd4 23.ed4 Ke8 24.Na5 (24.Ba3 Ra4 25.Be7 Ra2 26.Ra2 Ke7 27.Ra7 Nd5–/+) 24...Nd5 25.Nc6 R8b7 26.Bc1 Rb3 (26...Rb1 27.a5 a6 28.Ne7 Ne7 29.Ba3–/+) 27.Bd2 Bb4 28.Rab2 Bd2 29.Rb3 Rb3 30.Kd2 a6 31.Kc1 f6 32.Rc4 Nb6 (32...h6 33.a5–/+) 33.Na5 Ra3 34.Rc7 Ra4 35.Rc6 (35.Nb3 Rc4 36.Rc4 Nc4–/+) 35...Kd7 (35...e5 36.de5 Ra5 37.Rb6 fe5 38.Kd2–/+) 36.Rb6 Ra5 37.Rb7 Kd6 38.Kd2 Kd5 (38...Rg5 39.g3 a5 40.Ra7–/+) 39.Rg7=+ Ke4 (39...Kd4 40.Rh7 Ra2 41.Ke1=+) 40.f3 (40.Kc3 Ra3 41.Kc4 Ra1=) 40...Kf4 (better 40...Kd4!? 41.Rd7 Ke5 42.Rh7 Ra2 43.Ke3 Rg2 44.Rh5 f5 45.f4 Kd6–/+) 41.Kd3 (better 41.h4=) 41...Rd5 (41...h5 42.Rf7 f5 43.Rh7=) 42.Ra7 (better 42.Rh7!? Rd6 43.Rc7+–) 42...e5= 43.Ra6 Rd4 44.Ke2 f5 (better 44...Kg5!?=) 45.g3+– Kg5 46.h4 (46.h4 Kh5 47.Ra5+–) 1–0. Schiffler,Leonhard – Pietzsch, Riesa, 1952.

4.e3 Nc6 5.Nf3 e5 6.b5+/– e4 7.Nd4 Nd4= 8.Bd4 Bg4 9.Be2 Be2 10.Qe2 Be7 11.c4 dc4 12.Qc4 0–0 13.0–0 Ng4 14.g3 h5 15.Nc3+/– h4 16.Ne4 Qh6 17.Qe2 f5 18.Qf3 hg3=+ 19.fg3?? Qh2 0–1. mihai740609 – 2010bogdan, kurnik, 2011.

4.e3 Nbd7 5.Nf3 e6 (5...e5 6.c4=) 6.c4 Be7 (better 6...dc4 7.Bc4 Be7=) 7.c5+– Qc6?? (better 7...Nc5 8.Be5 Qc6+–) 8.Nd4 1–0. GuestMKNW – GuestGHVM, freechess.org, 2017.

4.e3 e5 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.e3 Nf6).

4.f3 e5=+ 5.d3 (5.e4 de4 6.fe4 a5=+) 5...Bd7 (5...a5 6.Nd2–/+) 6.Nc3 (6.e3 a5–/+) 6...d4 (6...Qb6 7.Qd2–/+) 7.Ne4 Ne4 8.fe4 c5 9.c3 b6 (9...Qb6 10.Nf3 Nc6 11.Qd2–/+) 10.Qd2 Ba4 (10...cb4 11.ab4 Nc6 12.Nf3=+) 11.e3= Nc6 12.ed4 cd4 13.c4 (13.Nf3 dc3 14.Bc3 f6=) 13...Be7 (13...b5 14.Nf3=+) 14.Rc1 (14.Nf3 Qc7=+) 14...Qd8 15.Qe2 (15.Nf3 b5=+) 15...Bh4 16.g3 Bg5 17.Rb1 (17.Ra1 a6=+) 17...Be3 18.Nf3 f6 (18...b5 19.Bc1 Bc1 20.Rc1=) 19.h4 (19.Nh4!?=) 19...b5=+ 20.c5 (20.Bc1 Bc1 21.Rc1 a5–/+) 20...Bb3 (20...a5 21.Bc1 Bc1 22.Rc1 ab4 23.ab4 Nb4 24.h5–+) 21.Bh3 (21.Bd4 Nd4 22.Nd4 Qd4 (worse 22...ed4 23.Rb3 Qc7 24.Qh5 Kd8 25.Qf3+=) 23.Rb3 Bf2 24.Kd2 Bg3 25.Qh5 Kf8–/+) 21...a5–/+ 22.Kf1 (22.Nd2 Bf7 23.ba5 Qa5 24.Qd1–+) 22...a4 (better 22...ab4 23.ab4 Ra2–+) 23.Kg2=+ Qe7 (23...0–0 24.Bc1 Bc1 25.Rbc1=+) 24.Rhf1 0–0 25.h5 Be6 26.g4 (26.Nh4 Bh3 27.Kh3 Bg5=) 26...g6 (26...Rac8 27.Nh4–/+) 27.hg6 hg6 28.Nh4 Qh7 29.Qe1 (29.Nf3 Rac8=+) 29...g5 (29...Bb3!? 30.Ra1 Nd8–/+) 30.Nf5= Bf5 31.ef5 (31.gf5 Kf7 32.Bg4 Rh8=+) 31...Rae8 32.Rh1 e4 33.de4? (33.Qd1 Qh4 34.Qe1 ed3–+) 33...Re4 (better 33...Qe7!? 34.e5 Qe5–+ (34...fe5?! 35.Qe2=+; 34...Ne5?! 35.Rf1–+)) 34.Qe2–/+ Qb7 35.Rbd1?? (better 35.Kf1 Rf4 36.Ke1–/+) 35...Rf4 (35...Ne5 36.Rhf1 Bf4 37.Qf2 Re3 38.Kg1 Nf3 39.Qf3 Rf3 40.c6 Qc6 41.Rd3 Rd3 42.Bg2 Be3 43.Kh2 Rd2 44.Rf3 Qf3 45.Bd4 Qg2) 36.Kg3 Qc7 37.Qd3 (37.Kg2 Rf2 38.Qf2 Bf2 39.Kf2 Qf4 40.Kg2 Qe4 41.Kh2 Qe5 42.Kg1 Qe3 43.Kg2 Qe2 44.Kg3 Qb2 45.Rd3–+) 37…Rf2 0–1. Delboy Smith – TNelson (1905), ChessWorld.net, 2009.

4.Nf3 (--> 1.b4 d5 2.Bb2 Nf6 3.Nf3 Qd6 4.a3).

4.Nf3 Nbd7 5.e3 e5 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.Nf3 Nd7 5.e3 Ngf6).

4.g3 c6 5.Bg2 (5.Nf3 Nbd7=+) 5...g6 (5...e5 6.Nf3 Nbd7 7.0–0=+) 6.Nf3= Bg7 (6...Nbd7 7.e4 de4 8.Ng5=) 7.d3 (7.Be5 Qd8=) 7...Nbd7 (7...Bg4 8.Nbd2=) 8.Nbd2 (8.0–0 a5=) 8...e5 (8...0–0 9.c4=) 9.e4 (9.c4 0–0=) 9...d4 (9...0–0 10.ed5 cd5 11.0–0=) 10.c3 (10.Qc1 0–0=) 10...dc3 11.Bc3 (11.Nc4 Qe6 12.Ng5 Qe7 13.Bc3 b5=) 11...Qd3=+ 12.Qb3? (better is 12.Be5 Ne5 13.Ne5=+) 12...Ne4–+ 13.Rd1?? (13.Ne4 Qe4 14.Kf1–+) 13...Qc3 14.Qc4 Qc4 15.Nc4 0–0 16.0–0 f5 17.Rfe1 b5 18.Ncd2 Nc3 19.Rc1 Nd5 20.Nb3 Bb7 21.Ng5 Rfe8 22.Red1 N7f6 23.Nc5 Bc8 24.h4 h6 25.Nf3 e4 26.Nd4 e3 27.fe3 Re3 28.Nc6 Nc3 29.Re1 Nfd5 30.Re3 Ne3 31.Re1 Ng2 32.Kg2 Ne4 33.Ne4 fe4 34.Kf2 Bf5 35.Ke3 Re8 36.Na7 Rd8 37.Nb5 Rd3 38.Kf4 Rf3# 0–1. coloplayah (2140) – chessleon (2010), net–chess.com, 2006.

4.h3 Nbd7 5.e3= g6 6.Nf3 Bg7 7.c4 c6 8.Be2 0–0 9.0–0 e5 (9...dc4!? 10.Bc4 a5=) 10.d3= Qc7 11.d4 (11.Qc2 Rd8+=) 11...ed4 12.ed4 (12.Bd4 Rd8=) 12...Ne4 13.Bd3 Ndf6 14.Nc3 Qf4 (14...Be6 15.cd5 Nc3 16.Bc3 Nd5 17.Qc2=+) 15.Be4 (15.Ne2 Qd6=) 15...Ne4 16.Ne4 (16.cd5 Nc3 17.Bc3 cd5=) 16...Qe4 (16...de4!? 17.Ne5 f6=+) 17.Re1= Qf5 18.Nh4 (18.c5 Be6=) 18...Qd7 (18...Qf6 19.Nf3 dc4 20.Ne5–/+) 19.c5=+ Qc7 20.Bc1 Bd4?? (better 20...a5=+) 21.Qd4+– Be6 (21...f6 22.Bh6 Bd7 23.Bf8 Rf8 24.Re7+–) 22.Bf4 (better 22.Bh6 f6 23.Bf8 Rf8 24.Re6 Qg7+–) 22...Qd7 23.Bh6 f5 (23...f6 24.Bf8 Rf8+–) 24.Re6 Kf7 25.Qg7 Ke6 26.Re1 1–0. Darkseid (1765) – Yoza (1720), ChessWorld.net, 2007.

4.e3 a5

5.Nc3 =.

5.Nf3 Nbd7 6.Nc3 c6 7.Ne2 (7.b5!?=) 7...ab4=+ 8.ab4 Ra1 9.Qa1 (9.Ba1 Qb4 10.Nf4 Qd6–/+) 9...Qb4 10.Nf4 Qd6 11.Be2 Qc7 12.Ne5 Ne5 13.Be5 Qd7 14.0–0 b5 15.Rb1 Bb7 16.Qb2 h5 17.Ra1 e6 (17...Rh6 18.Ra7+=) 18.Bf6+/– gf6 19.Nh5 Rh5 (better is 19...Qc7!? 20.Qf6 Rh6+/–) 20.Bh5+– Bd6? (better is 20...e5+–) 21.Qf6 Qe7 22.Qe7 Be7 23.Ra7 Bc8 24.d4 c5 25.dc5 Bc5 (25...Kd8+–) 26.Rc7 Be7 (26...Bd6 27.Rc8 Ke7 28.Rh8+–) 27.Rc8 Kd7 28.Ra8 Bc5 29.Bf7 b4 30.Ra6 e5 (30...d4 31.Be6 Ke7 32.ed4 Bd4 33.h4+–) 31.Bd5 Kc7 (31...Be7+–) 32.Rc6 Kd7 33.Rc5 Kd6 34.Rb5 b3 35.cb3 e4 36.Be4 Ke6 37.Rb6 Ke5 38.Ba8 Kf5 39.f4 (39...Kg4 40.Bf3 Kf5 41.g4#) 1–0. Fritz 10 – NN, 2007.

4.e3 Bf5

5.c4 e5 6.Nf3 Nbd7 7.Nc3 =.

5.c4 e6 6.f4 (6.Bf6 gf6 7.cd5 Qd5+=) 6...c6 (6...Be7 7.Nf3=+) 7.Nf3 (7.Bf6 gf6 8.d4 dc4 9.Bc4 Rg8=) 7...Be7 (7...dc4 8.Bc4 b5 9.Be2=) 8.cd5 (8.d3 Qd8=) 8...ed5 9.Be2 0–0 10.Nd4 (10.0–0 a5=) 10...Be4 (10...Bc8 11.Qc2=) 11.Rg1 (11.0–0 Qd7+=) 11...Bb1 (11...Re8 12.h4=+) 12.Rb1 (12.Qb1 a5=) 12...Re8 (12...Qd7 13.Qc2=) 13.Nf5 (13.g4 Qd7+=) 13...Qc7 (13...Qe6 14.Bg4 Ng4 15.Qg4=) 14.Ne7 (14.g4!? g6 15.g5+=) 14...Qe7=+ 15.Bd4 (15.g4 Ne4 16.g5 a5=) 15...b6 (15...a5 16.ba5 Ra5 17.Qb3=) 16.g4 (16.Qa4 Nfd7=) 16...Nbd7 (16...Ne4 17.g5=) 17.g5= Ne4 18.Bg4 (18.f5!?=) 18...c5=+ 19.bc5 bc5 20.Rb7? (better is 20.Ba1!? c4 21.Rb7–/+) 20...cd4–+ 21.Rd7 Qa3 22.Rd5 de3 23.Re5 ed2 24.Kf1 Re5 25.fe5 Qd3 26.Kg2 Ng5 (27.Qf1 Qd5 28.Bf3 Nf3 29.Qf3 Rd8–+) 0–1. jjjooojjjoojjoj (2375) – diggitus (2345), net–chess.com, 2006.

5.Nf3 Nbd7 6.c4 (6.Nc3 Be4=) 6...dc4 (6...e5 7.Nc3 c6 8.cd5 Nd5 9.Nd5 Qd5 10.Rc1=) 7.Bc4 e6 (7...Bd3 8.Qb3 Bc4 9.Qc4=) 8.d4 (8.d3 a5=) 8...Nb6 (8...Be7 9.0–0=) 9.Bb3 (9.Be2 a5 10.ba5 Ra5=) 9...Be7 10.Nc3 c6 11.0–0 h6 (11...0–0 12.Ne5=) 12.Ne5 (12.Bc2 Bc2 13.Qc2 a5+=) 12...Nfd7 (12...0–0 13.Qf3=) 13.e4+= Bh7 (13...Ne5 14.de5 Qd1 15.Rad1= (< 15.Nd1 Be4 16.Nc3 Bf5–/+; 15.Bd1?! Bh7=; 15.Rfd1?! Bg6=)) 14.Nf3 (14.Nd7 Qd7 15.d5 ed5 16.ed5 Rd8+=) 14...0–0–0 (14...Rd8 15.Rc1+=) 15.Rc1 Bg5 16.Nb5 Qb8 17.Ng5 hg5 18.f3 a6 (18...g4 19.d5 Be4 20.Na7 Qa7 21.fe4 Nd5 22.Bd4+/–) 19.Nc3 Bg6 20.g3 Rh3 21.Rf2 Rdh8 22.Rg2 Nf6 23.d5 Nh5? 24.Ne2 Qd6 25.e5 Qd7 26.dc6 Qd1 27.Bd1 Nd5? 28.cb7 Kb7 29.Bd4 Bd3 30.Kf2 Be2 31.Be2 g6 32.b5 Nhf4?? 33.ba6 Ka8 34.gf4 Nf4 35.Bb5 (35…Rd8 36.Bc6 Kb8 37.a7 Kc7 38.Be4 Kd7 39.Bb6 Nd3 40.Bd3+–) 1–0. Deline,R – St_Jean,Benoit, corr 4AMM–06 e–mail, 1997.

4.e3 g6

5.b5 Bg7 6.a4 e5 7.c4 c6 8.Nf3 Nbd7 (8...e4 9.Ne5=+) 9.Qc2 0–0 10.Be2 e4 11.Nd4 Ne5 (11...c5 12.Nb3=+) 12.cd5 c5 13.Nb3 b6 14.a5 Bf5 (worse 14...Qd5 15.Be5 Qe5 16.ab6+–) 15.ab6 (15.Nc3 Nd3 16.Bd3 ed3=+) 15...ab6=+ 16.Nc3 Nd5 (16...Nd3 17.Bd3 ed3 18.Qc1–/+) 17.Nd5 (better 17.Ra8!? Ra8 18.Ne4=+) 17...Qd5–/+ 18.0–0 Nf3 19.Kh1 Bb2 (19...Qd6 20.g3 Bb2 21.Qb2–/+) 20.Qb2=+ Ne5 21.f4? (better 21.Ra6!?=+) 21...ef3–+ 22.Bf3? (better 22.gf3 Ra1 23.Na1–+) 22...Nf3 23.Rf3 (23.gf3 Bh3 24.Rad1 Bf1 25.Rf1 Qd3–+) 23...Be4 (23...Qb3 24.Qf6 (24.Qb3?? Ra1 25.Qd1 Rd1 26.Rf1 Rf1) 24...Ra1 25.Qa1 Qb5 26.Kg1–+) 24.Rf2 (24.Raf1 Bf3 25.gf3–+) 24...Ra1 (better 24...Qb3! 25.Qf6 Ra1 26.Qa1 f5–+) 25.Na1 Qd3 (25...Ra8!? 26.Qc3–+) 26.Qc3?? (better 26.h3–/+) 26…Qb1 (26...Qb1 27.Qc1 Qc1 28.Rf1 Qf1) 0–1. RichardSommer (2105) – ratar77 (2085), lichess.org, 2020.

5.c4 dc4 6.Bc4 Bg7 7.Nf3 0–0 8.Nc3 Be6 9.Nb5 Qd8 (better is 9...Qc6!? 10.Be2 Qd7=) 10.Be6+/– fe6 11.Qb3 (11.Ng5 Qd5 12.Ne6 Qb5 13.Nc7 Qc6 14.Na8 b5 15.Qb3 Kh8+/–) 11...Qd5 (better is 11...Qd7!? 12.Nbd4 Nd5+=) 12.Qd5+– Nd5 13.Bg7 Kg7 14.0–0 (14.e4!? c6 15.Ng5 Rc8+/–) 14...c6+/– 15.Nbd4 Nc7 16.Rac1 (16.Ng5 Rf6+/–) 16...a6 (16...Kf6 17.Nb3+/–) 17.Ng5+– Rf6 18.Ne4 Rf7 19.Nc5 Ra7 20.Nce6 (20.f4 Kg8+–) 20...Ne6+/– 21.Ne6 Kg8 22.a4 Nd7 23.d4 Nb6 24.Ra1 Nd5 25.Rab1 Nc3+= 26.Ra1 Nd5+– 27.Rfc1 Nb4+= 28.a5 Nd5? 29.Rab1+– Nf6 30.Rc6!! h5 31.Rc7 (31…Ne4 32.Rbb7 Rb7 33.Rb7+–; 31.Rc8!? Kh7 32.Ng5 Kg7 33.Nf7 Kf7+–) 1–0. Reimer,Karl – Ortinau,Peter, Pfalz–op Landau, 1996.

5.c4 dc4 6.Bc4 Bg7 7.Nf3 0–0 8.d3 h6 9.0–0 Qc6 (9...Nc6 10.Qc2=) 10.Nbd2 Bg4 11.h3 Bh5 (better is 11...Bf3!? 12.Qf3 Qf3 13.Nf3 e6+/–) 12.g4+– Bg4 (12...Ng4 13.Bg7 Kg7 14.b5+/–) 13.hg4 Ng4 14.Bg7 Qd6?? (14...Kg7 15.Nd4 Qd7+–) 15.Bf8 Kf8 16.Kg2 e5 17.Ng5 Qc6 (17...f5 18.Nge4 Qb6 19.Qf3+–) 18.Nde4 (better is 18.e4 Nh2 19.Kh2 hg5+–) 18...Kg7 (18...f5 19.Ne6 Ke7 20.b5+–) 19.Qg4 (19.Nf7 b5 20.Qg4 bc4 21.Ne5 Qe8 22.Nc4 Nd7+–) 19...hg5 20.Rh1 f6 21.Qh3 Kf8 22.Qh8 Ke7 23.Rh7# 1–0. Fritz 10 – NN, 2007.

5.c4 dc4 6.Bc4 Bg7 7.Nf3 0–0 8.Be5 Qb6 =.

5.Nf3 Bg4 =.

3.a3 Bg4

4.d4 Nd7 5.Nf3 h6 6.e3 Ngf6 7.Bd3 e6 8.Nbd2 a5 9.c4 dc4 (better is 9...ab4!? 10.c5 Qe7 11.ab4 Ra1 12.Qa1 Qd8+=) 10.Nc4+/– Qe7 (10...Qd5 11.e4 (11.ba5?! Be7+=) 11...Qh5 12.Na5+/–) 11.Na5 Ra7 12.h3 Bh5 (12...Bf3!? 13.Qf3 e5+/–) 13.g4 Bg6 14.Bg6 fg6 15.Qc2 c6 16.Nc4 g5 17.Nfe5 Ne5 18.de5 Nd5 19.Nd6 Kd8 20.e4 Nf4 (20...Nb6+–) 21.Bd4 Ra6 22.b5 Ra8 23.Bb6 Kd7 24.Rc1 Rc8 25.Nc8 Kc8 (25...Qa3 26.bc6 Ke8 27.cb7 Bb4 28.Kf1 Qa6 29.Qc4 Qb7 30.Qb4 Qa6 31.Kg1+–) 26.bc6 (26...Qc5 27.Bc5 Bc5 28.cb7 Kb8 29.Kf1+–) 1–0. CODD (1765) – thotares (1650), internet, 2007.

4.Nf3 Nd7 5.h3 Bf3 6.ef3 =.

4.Nf3 Bf3 5.ef3 e5 (5...Nf6 6.Qe2=) 6.Qe2 Nd7 7.d4 f6 8.de5 fe5 (8...Ne5? 9.f4 d4 10.fe5 Qe5 11.Bd4 Qe2 12.Be2+–) 9.f4 e4 10.Nc3 (10.c4 c6+=) 10...0–0–0 (10...Ngf6 11.Nb5 Qb6 12.c4 dc4 13.Qc4=) 11.Rd1 Ngf6 12.Qe3 Kb8 13.Nb5 Qb6 ½–½. Torre,Isidro (2150) – Mulenko,Aleksandr (2285), CL1–2001.05.02, 2001.

4.Nf3 Nh6 5.Nc3 (5.Be5 Qd8=) 5...Nd7 6.h3 (6.e3 c6=) 6...Bf5 (6...Bf3 7.ef3 c6 8.Be2=) 7.Nb5 (7.d3 e6+=) 7...Qb6= 8.e3 e6 (8...c6 9.Nbd4=) 9.c4 (better 9.Bd4 c5 10.bc5 Nc5 11.Nc3+=) 9...a6?? (better 9...dc4 10.Bc4 a6=) 10.c5+– Qc6 (10...Nc5 11.bc5 Bc5 12.Bg7 Rg8 13.Nc7 Qc7 14.Bh6 Bd6+–) 11.Nbd4 1–0. Wall,Bill – Op2mystic, internet, 1999.

4.h3 Bf5 5.Nf3 c5 6.Nc3 cb4 7.ab4 Qb4 8.Nd5 Qb5 9.Nc7 Kd8 10.Nb5 a6 11.Ne5 ab5 12.Ra8 f6 13.Rb8 Bc8 14.Nf7 Kc7 15.Ra8 Nh6 16.Nh8 e6 17.Qa1 Bb4 18.Be5 fe5 19.Qe5 Kd8 20.Qe6 Kc7 21.Rc8 1–0. b4_player (2140) – dhinah, GameColony.com, 2002.

4.h3 Bh5

5.d4 Nf6 6.Nf3 e6 7.Ne5 Nbd7 8.g4 Bg6 9.Ng6 hg6 10.Bg2 c6 11.Nd2 e5 12.de5 Ne5 13.g5 Nfg4 14.hg4 Rh1 15.Bh1 Ng4 16.Nf3 Nh2 17.e4 Nf3 18.Qf3 0–0–0 19.Qf7 de4 20.Be4 Qd2 21.Kf1 Qg5 22.Bg6 Bd6 23.Bg7 Qh4 24.Qe6 Kb8 25.Bf6 Qh1 26.Ke2 1–0. Machete99 – guest878, ICC, 2002.

5.Nf3 Nd7 6.Nc3 =.

5.Nf3 e5 6.d3 (6.Be5 Qe7 7.g4 Bg6+/–) 6...e4 (6...Bf3!? 7.ef3 Nc6+=) 7.de4+= c6? (7...de4 8.Qd6 cd6+= (8...Bd6? 9.Bg7 ef3 10.ef3+–)) 8.ed5 cd5 9.Nc3 Nf6 10.e3 Qd7 (10...Nbd7 11.g4 Bg6 12.g5+–) 11.Be2 (11.g4 Bg6+–) 11...Nc6 12.0–0 Bd6 13.Qd2 (13.Nd5?! Nd5 14.c4 Nf6=) 13...0–0 14.Rad1 Rfe8 (14...Rfd8!?+/–) 15.Nd5+– Qe6?? (better is 15...Ne4 16.Qd3 Bg6+–) 16.Nf6 Qf6 (16...gf6 17.Qd6 Ne5 18.Qe6 Re6+–) 17.Bf6 (17.Bf6 Bb4 18.ab4 gf6 19.Qd6+–; 17.Qd6?! Qb2 18.Qd3 Bf3 19.Bf3 Ne5+–) 1–0. Fournier,Frederic – carloshernan, Active (3/0), 2005.

5.Nf3 h6 6.d4 a6 7.Qd3 e6 8.g4 Bg6 9.Qd2 Nd7 10.Nc3 Nb6 11.e3 c6 12.h4 Nc4 (better is 12...Bh7!?=) 13.Bc4+= f6?? (better is 13...dc4 14.Ne5 b5+=) 14.Bd3 Bf7 15.e4 b5 16.Qe3 Be7 17.e5 Qb8 18.h5 Qb6 19.Bg6 a5 (19...Bg6 20.hg6 Kd7 21.Ne2+–) 20.Bf7 (better is 20.ef6!? Nf6 21.ba5 Qb7+–) 20...Kf7 21.Ne2 (better is 21.ba5 Ra5 22.ef6 gf6 23.Ne2+–) 21...a4 (21...ab4 22.ef6 gf6+–) 22.Rd1 (22.Nf4 Re8 23.ef6 Bd6 24.fg7 Kg7+–) 22...Bd8 (22...Re8 23.Qd3 Bd8 24.Nf4+–) 23.c3 (23.ef6!? Bf6 24.Nf4 Ne7 25.Qe6 Kf8+–) 23...Qb8 24.Qf4 Bc7 25.g5 Ra7 26.g6 Ke7 27.Qh4 Bb6 28.Rg1 Kd8 29.Nf4 Ne7 30.Ne6 Kc8 31.Ng7 Rf8 32.Qh3 Kb7 33.Qe6 f5 34.Qe7 Ka8 35.Qh4 Bd8 36.Qg3 Rg7 37.Bc1 Rh8 38.Nh4 Bc7 39.Nf5 Rd7 40.g7 Rf7 41.gh8Q Qh8 42.Qg6 Rf8 43.Qc6 Kb8 44.Qb5 Kc8 45.Ne7 Kd8 46.Ng6 Qg8+– 47.Bh6 Re8 48.Bg5 Kc8 49.Qa6 Kd7 50.Qa4 Kc8 51.Rg4 Re6 52.Nf4 Rd6 53.ed6 Bd6 54.Qa8 Kd7 55.Qg8 Kc6 56.Qd5 Kb6 57.Qd6 Kb7 58.Nd5 Ka7 59.Bf6 Kb7 60.Rg7 Kc8 61.Qf8 1–0. BLUEMOONIE – huskerbacker, ChessWorld.net, 2012.

3.b5 a6

4.a4 Nf6 A) 5.Na3 Ne4 (5...Nbd7 6.Nf3 Ne4 7.e3 a5 8.Nb1 Ndf6 9.Be5 Qc5 10.Nc3 Bg4; 5...Qb4 6.Qb1 Ne4 7.Nf3 Nd7 8.c3 Qc5 9.Nd4 e5 10.f3 Nd2; 5...Bg4 6.h3 Bh5 7.Nf3 Nbd7 8.c4 c6 9.cd5 cd5 10.Rc1 Ne4; 5...a5 6.Nf3 Nbd7 7.e3 g6 8.Bd3 Bg7 9.0–0 0–0 10.Re1 Nc5; 5...Bf5 6.Nf3 Ne4 7.e3 Nd7 8.Nh4 Bg6 9.f3 Nec5 10.Ng6 hg6) 6.Nf3 Nd7 7.e3 f6 8.c4 c6 9.cd5 cd5 10.Nc2 Nb6; B) 5.Bf6 ef6 (5...gf6 6.Nc3 d4 7.Ne4 Qd5 8.f3 Bh6 9.Nh3 Nd7 10.c4 Qe5; 5...Qf6 6.Nc3 d4 7.Ne4 Qg6 8.d3 f5 9.Nd2 e5 10.Ngf3 Nd7) 6.Nc3 d4 7.Ne4 Qd5 8.f3 f5 9.c4 Qd8 10.Nf2 Bd6; C) 5.Ra3 Nbd7 (5...e5 6.Nf3 Nbd7 7.e3 Be7 8.Be2 0–0 9.0–0 Qe6 10.Nc3 ab5; 5...Bg4 6.h3 Bd7 7.Nf3 Ne4 8.e3 ab5 9.ab5 Ra3 10.Ba3 Qf6; 5...Ne4 6.Nf3 ab5 7.ab5 Ra3 8.Ba3 Qf6 9.Qc1 Nd7 10.d3 Nec5; 5...Bd7 6.e3 Ne4 7.Nf3 ab5 8.ab5 Ra3 9.Ba3 Qf6 10.c4 e6; 5...Qb4 6.Rb3 Qa4 7.Nf3 Qg4 8.h3 Qh5 9.Nc3 e5 10.Rh2 e4) 6.Nf3 e5 7.e3 Be7 8.Be2 0–0 9.0–0 Qe6 10.ba6 Ba3; D) 5.e3 ab5 6.Bb5 c6 7.Be2 Na6 8.Nf3 Ne4 9.Nc3 Nac5 10.0–0 f6; E) 5.Nf3 Nbd7 (5...ab5 6.ab5 Ra1 7.Ba1 Nbd7 8.e3 g6 9.c4 Bg7 10.cd5 0–0) 6.e3 ab5 7.ab5 Ra1 8.Ba1 e5 9.Bb2 Be7 10.Be2 0–0.

4.Qc1 ab5–/+ 5.e3 c5 (5...c6 6.f4–/+) 6.Bb5= Nc6 7.Be2 (7.Nf3 Qg6 8.0–0 Bh3=) 7...Bd7 8.Nf3 e6 9.0–0 Nf6 10.d4 (10.Bf6 gf6 11.Qb2 c4=) 10...Be7 11.c4 cd4 12.Nd4 dc4 13.Bc4 (13.Rd1 Nd4 14.Rd4 Qb8=) 13...Nd4=+ 14.Bd4 e5 (14...Rc8 15.a4 e5 16.Bb2–/+) 15.Bb2=+ 0–0 16.Rd1 Qb8 17.Bb3 Be6 (17...Rc8 18.Nc3=+) 18.Nc3 (18.Be6 fe6 19.Nd2 Rc8+=) 18...Bb3= 19.ab3 Ra1 20.Qa1 e4 21.Ne2 (better 21.Nd5 Nd5 22.Rd5+=) 21...Bb4?? (better 21...Qc8!?=) 22.Ng3 (22.Bf6!? gf6 23.Qf6 Qa8 24.Qg5 Kh8+–) 22...Rd8 (22...Be7 23.Qb1+–) 23.Rf1 (23.Bf6 gf6 24.Ne4 Rd1 25.Qd1 Qe5+–) 23...Ng4 24.h3 (better 24.Bg7 h5 25.Bf6+–) 24...Nf6?? (better 24...Ne3 25.Rc1 f6=) 25.Bf6+– gf6 26.Ne4 Qe5?? (26...Be7 27.Nf6 Bf6 28.Qf6 Qd6 29.Qg5 Kh8+–) 27.Nf6 Kf8 (27...Qf6 28.Qf6 Rd6+–) 28.Qe5 Bd6 29.Nh7 Kg8 30.Nf6 (30.Qf5 Kg7 31.Ng5 Bh2 32.Kh2 Re8 33.Qf7 Kh6 34.Qf6 Kh5 35.g4 Kh4 36.Ne6) 30...Kf8 31.Qg5 Ke7 32.Nd5 Ke6 33.Qd8 Kd5 (33...Bc5 34.Nf4 Ke5 35.Rd1 b6 36.Qg5 f5 37.Rd5 Ke4 38.Qf5) 34.Rd1 Ke6 (34...Ke4 35.Qd6 Kf5 36.Rd5 Ke4 37.Qe5) 35.Qd6 Kf5 36.Rd5 (36.Rd5 Ke4 37.Qe5) 1–0. BeepBeepImAJeep (2600) – andreigronivo (1920), lichess.org, 2016.

4.Nc3 A) 4...d4 5.Ne4 Qd5 6.Ng3 ab5 7.e4 Qc5 8.Nf3 Nc6 9.Bd3 Nf6 10.0–0 Be6; B) 4...ab5 5.Nf3 (5.Nb5 Qb6 6.e3 Bd7 7.a4 Nc6 8.c4 Nb4 9.Qb3 c5 10.cd5 Nf6; 5.e4 de4 6.Nb5 Qc6 7.a4 Nd7 8.Nh3 Ngf6 9.Be2 e5 10.0–0 Bc5) 5...b4 (5...c6 6.e4 Nd7 7.ed5 Ngf6 8.dc6 bc6 9.Qe2 Nc5 10.Qe5 Bg4) 6.Nb5 Qb6 7.e3 Bd7 8.Nbd4 Nf6 9.Ne5 c5 10.Ndf3 Nc6; C) 4...Nd7 C1) 5.Nf3 Ngf6 (5...Nb6 6.e4 d4 7.Nd5 Nd5 8.ed5 Qd5 9.ba6 ba6 10.Bd4 c5) 6.e3 Nc5 7.Be2 Bd7 8.ba6 Na6 9.Nb5 Qb6 10.a4 c6; C2) 5.e3 Nc5 (5...Ngf6 6.Nf3 g6 7.Be2 Bg7 8.0–0 0–0 9.ba6 ba6 10.Rb1 Rb8; 5...Nb6 6.Nf3 Nf6 7.a4 Bg4 8.h3 Bh5 9.Ba3 c5 10.bc6 Qc6; 5...h5 6.Nf3 Ngf6 7.Be2 Nc5 8.0–0 h4 9.h3 g5 10.ba6 ba6; 5...Rb8 6.Nf3 Ngf6 7.Be2 Nc5 8.0–0 Bd7 9.a4 g6 10.Ba3 Nfe4; 5...a5 6.Nf3 Ngf6 7.Be2 g6 8.0–0 Bg7 9.Qc1 Nc5 10.d4 Nce4) 6.Nf3 Nf6 7.Rb1 a5 8.Ba3 Nfe4 9.Na4 e5 10.d3 Qf6; C3) 5.ba6 ba6 (5...Ra6 6.Nf3 Rb6 7.Na4 Ra6 8.Nc3 Rb6 9.Na4 Ra6 10.Nc3 Rb6; 5...Ngf6 6.ab7 Bb7 7.Nf3 c6 8.e3 e6 9.Bd3 Nc5 10.Rb1 Be7) 6.Nf3 Ngf6 7.Rb1 Rb8 8.e3 Nc5 9.Ba3 Rb6 10.Be2 g6; D) 4...Nf6 5.e3 Nbd7 (5...c6 6.a4 Nbd7 7.Ba3 c5 8.ba6 ba6 9.Nf3 Rb8 10.Rb1 Rb1; 5...Bg4 6.Nf3 c6 7.a4 Nbd7 8.h3 Bf3 9.gf3 g6 10.ba6 ba6) 6.Nf3 ab5 7.Nb5 Qb6 8.Rb1 e6 9.Bd3 Bc5 10.0–0 0–0.

4.e3 ab5 5.Bb5 c6 6.Be2 Nf6 7.Nf3 (7.f4 Bf5=) 7...Nbd7 8.0–0 (8.d4 e6=) 8...g6 (8...e5 9.Nc3=+) 9.c4= Bg7 (9...dc4 10.Bc4 Bg7 11.d4=) 10.cd5 cd5 11.d4 0–0 12.a4 Nb8 13.Ba3 Qd8 (13...Qe6 14.Nc3=) 14.Nc3 Nc6 15.Ne5 Bd7 (15...Re8 16.Rc1+=) 16.Nd7 (16.Qb3 Na5 17.Qb4 Re8+=) 16...Qd7 (worse 16...Nd7 17.Nd5 Re8 18.Rb1+–) 17.Nb5 (17.Rb1 Rfc8+=) 17...Ne4 18.f3 Ng5 19.f4 Ne4 20.h3 (20.Bf3 Nf6=) 20...Ng3 21.Rf3? (better 21.Re1!?=+) 21...Ne2–+ 22.Qe2 Ra4 23.Nc3 Ra5 24.Nb5 (24.Ra2–+) 24...Rfa8 25.Rff1 Nd8 (25...Nd4!? 26.Nd4 Ra3 27.Ra3 Ra3 28.f5–+) 26.Rfb1–/+ f6 27.Nc3?? (better 27.Bb2–/+) 27...Ra3–+ 28.Ra3 Ra3 29.Qb2 Ra6 30.Nb5 (30.Kh2 e6–+) 30…Rb6 0–1. AsceticKingK9 (1795) – mizuzul (2195), ChessWorld.net, 2019.

4.e4 Qb4 5.Qc1 Qe4 6.Ne2 –/+.

4.e4 de4 5.Nc3 Nf6 6.a4 (6.Qe2 Bf5–/+) 6...e5 7.Ba3 Qd7 (7...c5 8.bc6 Qc6 9.Bf8 Rf8 10.Nge2–/+) 8.Qe2 (8.Bf8 Rf8 9.Nge2 h6–/+) 8...Ba3–+ 9.Ra3 Qd4 (9...ab5 10.Nb5 0–0 11.f3–+) 10.g3 (10.f3 Qc5 11.Rb3 Be6–/+) 10...0–0–+ 11.Bg2 (11.Qe3 Qd6 12.Rb3 ab5 13.Rb5 Qa3–/+) 11...Bg4 (11...ab5 12.Nb5 Qb2 13.Qd1–+) 12.Ne4?? (better is 12.f3 Qc5 13.Rb3–/+) 12...Be2–+ (13.Nf6 gf6 14.Ke2 ab5 15.Bb7 Ra4–+) 0–1. Seemann,W – Mattheus,Ingomar, corr GER–ch qgC26, 1993.

4.Nf3 ab5 A) 5.Nc3 b4 6.Nb5 Qb6 7.e3 Nc6 8.Bd3 Nf6 9.0–0 Ra5 10.Qe2 Bg4; B) 5.e3 b4 (5...Nd7 6.Bb5 Qb4 7.Bd7 Bd7 8.Be5 f6 9.Bc7 Qc4 10.Bg3 Nh6) 6.a3 Nf6 7.ab4 Ra1 8.Ba1 Qb4 9.Nc3 c6 10.Ne2 Nbd7; C) 5.Be5 Qd7 (5...Qd8 6.Nc3 c6 7.e3 Nd7 8.a3 Ne5 9.Ne5 Nf6 10.Bd3 Qd6; 5...Qg6 6.e3 Nf6 7.Bc7 Nc6 8.Nc3 b4 9.Nb5 Bg4 10.Bb6 Rc8) 6.e3 b4 7.a3 Nc6 8.ab4 Ra1 9.Ba1 Nb4 10.Na3 Nf6.

4.a4 ab5 5.ab5 Ra1

6.Ba1 Qb6 7.e3 Nf6 8.c4 e5 (8...Bf5!?=) 9.Be5+= Bc5 (9...dc4 10.Nc3+=) 10.Bf6 Qf6 11.cd5 0–0 12.Nc3 Re8 13.Nf3 Bb4 14.Qb3 Bc3 15.Qc3 Qg6 16.g3 (better 16.Bd3!? Qd6 17.Qc2+–) 16...Bg4 17.Bg2 (17.Bd3 Qh5 18.Nd4 Qd5+–) 17...Qb1 18.Ke2 Qb5 19.d3 (19.Qd3 Qd7+=) 19...Nd7 (19...Qd5 20.h3 (20.Qc7?? Qa2 21.Kf1 Rc8 22.Qc8 Bc8–+) 20...Qa2 21.Qd2 Bf3 22.Bf3=) 20.Rc1 (20.h3 Bf3 21.Bf3 Ne5+–) 20...Bf3 (better 20...Ne5! 21.h3 Bf3 22.Bf3 Nf3 23.Kf3 Qd5 24.e4 Qd6=) 21.Bf3+– (worse 21.Kf3 Qd5 22.e4 Qh5 23.Ke3 Qh2–+) 21...Ne5 22.Qc7?? (better 22.Be4+–) 22...Qd3 23.Ke1 Nf3 0–1. RichardSommer (1975) – dialvien (1930), lichess.org, 2020.

6.Ba1 e5 7.e3 Nf6 8.Nf3 Nbd7 9.c4 e4 10.Nd4 dc4 11.Bc4 Ne5 12.Be2 Bg4 13.f3 ef3 14.gf3 Bc8 15.Nc3 Be7 16.Kf2 (16.Rg1!?=) 16...Nh5–/+ 17.Ne4?? (better is 17.h4 Qg6 18.Qg1 Nd3 19.Bd3 Qd3 20.Qc1+=) 17...Bh4–+ 18.Ng3 Ng3 19.hg3 Nd3!! 20.Bd3 (20.Bd3 Qg3 Mate attack) 20...Qg3 21.Kf1 Qf2# 0–1. Norgaard,K (2080) – Andersen,Jack (2270), 48th XtraCon TCh–DEN, 2010.

6.Ba1 e5 7.e3 g6 8.Nf3 Bg7 9.Be2 Ne7 10.0–0 0–0 11.d4 e4 12.Nfd2 f5 13.c4 c6 14.c5 Qf6 15.b6 (15.Nc3!?+=) 15...f4+= 16.ef4 Qf4 17.Na3 Qg5 18.Nc2 Bh3 19.Ne3 Nf5 20.Ng4 Bg4 21.Bg4 Nd4 (21...Na6 22.Nb3 Nb4 23.Na5+=) 22.Bd4 (22.Ne4!? de4 23.Bd4 Bd4 24.Be6 Kg7 25.Qd4 Qf6 26.Qd6+= (26.Qe4? Re8–+)) 22...Bd4+= 23.Be6? (23.Ne4!? Qe5 24.Ng5 Bc5 25.Ne6+=) 23...Kh8 (23...Kg7 24.Ne4 Qe5 25.Ng3–+) 24.Nb3? (better is 24.Ne4 Qe5 25.Nd6 Bc5 26.Nf7 Rf7 27.Bf7–/+) 24...Bf2 25.Rf2 Rf2 26.Kf2 Qf6 0–1. phildo (1825) – freddyrock, gameknot.com, 2013.

6.Ba1 e5 7.Nf3 Nd7 8.e3 (8.g3 Ngf6 9.Bh3 e4 10.Nh4 g6) 8...Ngf6 9.Bb2 c5 (9...Be7 10.Be2 0–0) 10.bc6 bc6 11.d4 ½–½. Cuellar,Jorge (2260) – Boudy,Julio (2370), Havana Radio Rebelde, 1982.

6.Ba1 Nf6 7.Nf3 Nbd7 8.g3 g6 9.Bg2 Bg7 10.0–0 0–0.

4.ba6 Na6

5.e3 =.

5.Nf3 Qb6 6.Bc3 e5 (6...f6!?=) 7.Be5+= (worse is 7.Ne5 d4–/+) 7...f6 8.Bc3 Bd6 9.e3 Ne7 10.a4 Nb4 (10...0–0 11.a5 Qc6 12.Nd4+=) 11.Na3 c6 12.Bd4 Qd8 13.c3 Na6 14.c4 0–0 (14...Be6 15.Qb3 c5 16.Bc3+=) 15.Be2 (15.cd5 Nd5 16.Bc4 Be6+=) 15...Be6 16.0–0 (16.Qb3 Qd7+=) 16...Qd7 (16...Nf5 17.cd5 Bd5 18.Bc3+=) 17.cd5 Nd5 18.Nc4 Bc7 19.Bb2 (19.a5 c5 20.Bb2 Rfd8+/–) 19...Rfd8 20.Nd4 (20.a5 Nab4+/–) 20...Bf7+= 21.Nb3 (21.a5 Ndb4+=) 21...Ndb4 (21...b5 22.ab5 cb5 23.Na3+=) 22.d4 Bd5 23.Bc3 (23.a5 Qf7 24.Nbd2 Qg6+/–) 23...Qf7 24.Nbd2 Qe7 (24...b5 25.Bb4 Nb4 26.Nb2+=) 25.Qb1 Bf7 (25...b5 26.ab5 cb5 27.Bb4 Nb4 28.Na3+/–) 26.e4 (26.a5 Nd5 27.Rc1 Bg6+/–) 26...c5 (26...Nd5 27.ed5 Qe2 28.Re1+/– (worse is 28.Qb7 Bd5 29.Qb3 Bf4–/+)) 27.dc5 Qc5 (27...Nc6 28.Nd6 Nc5 29.Nf7 (29.Nb7? Nb7 30.Rd1 Nc5–+) 29...Kf7 30.Bc4 Kf8 31.e5 Ne5 32.Qh7 Nc4 33.Nc4 Ra4 34.Ne3+/–) 28.Rc1 Bf4 29.g3 Bh6 30.Nb3 (30.a5 Qe7+/–) 30...Qe7 (30...Qa7 31.Rd1+/–) 31.f4 Bg6 32.Ncd2 Nc6 (32...Rac8 33.a5+/–) 33.Bb5 (33.a5 Rac8+/–) 33...Kh8 (33...Bf7 34.a5+/–) 34.Bc6 (34.a5 Nc5 35.Nc5 Qc5 36.Kg2 Qe3+/–) 34...bc6 35.Ba5 Rd6 36.Bb6 Qd7 37.Qc2 Nb4 38.Qc3 (38.Qd1 Nd3 39.Rc2 Qe8+/–) 38...Nd3 39.Rc2 Nf4 40.gf4 Bf4 41.Bd4 Qg4 (41...Bf7 42.Nc4 Bc4 43.Qc4 Rd4 44.Qd4 Qd4 45.Nd4 Be3 46.Kg2 Bd4 47.Rb1+/–) 42.Kf1 Qh4 (42...Bd2 43.Rd2 Qe4 44.Kf2+/–) 43.h3 (43.Nc4 Rdd8 44.Nc5 Bh2+/–) 43...Bf7 (43...Rad8 44.Nc4 R6d7 45.Re2+/–) 44.Bc5 (44.a5!?+/–) ½–½. Hassim – Kaniak,Andrzej, email 4AMM–09, 1997.

5.Nf3 f6 6.d4 Bf5 7.Nh4 Bd7 8.e3 Nh6 9.Ba3 Qc6 10.Bd3 g6 11.f4 (11.Nf3 Bf5=) 11...Qa4 (11...e5 12.Bf8 (12.de5? Ba3 13.Na3 Qc3 14.Kf2 Qa3–+) 12...Rf8 13.0–0=+) 12.Qd2 e6 (12...Bg7 13.Nf3=) 13.Bf8 Rf8 14.Nc3 Qa5 15.Rb1 Nb4 16.Ke2 (16.Nf3 Kf7+=) 16...b6 (16...e5 17.de5 fe5 18.fe5 Na2 19.Nd1 Bg4 20.Ke1 Bd1 21.Qa5 Ra5 22.Rd1–+) 17.Rb2= Nd3 (18.cd3 Nf7=). Schiffler,L – Dethloff, Riesa, 1952.

3.b5 Qb4

4.Be5 Qa5 5.e3 (5.Nc3 Nd7 6.Nf3 Ne5 7.Ne5 e6=+) 5...Nd7 6.Bc3 Qb6 7.Nf3 Ngf6 8.Bd4 Qd6 9.c4 e6 (9...e5 10.c5 Qe7 11.Bc3=+) 10.Be2 (10.cd5 e5 11.Bc3 Qd5=+) 10...Be7 (10...dc4 11.Bc4 e5 12.Bb2=) 11.Bb2 (11.cd5 e5 12.Bc3 0–0=+) 11...Qb6 (11...0–0 12.cd5 Nd5 13.e4=+) 12.0–0= c6 (12...dc4 13.Qa4=) 13.a4 (13.Bd4 c5 14.Be5 Ne5 15.Ne5 0–0=) 13...0–0 (13...dc4 14.Bc4 cb5 15.ab5+=) 14.d4 (14.Bd4 c5 15.a5 Qd6=) 14...Ne4 (14...dc4 15.Bc4 Re8 16.Qe2+=) 15.Nbd2 (15.Ba3 Ba3 16.Na3 c5+=) 15...f5 (15...Ndf6 16.a5 Qc7 17.Ne4 Ne4 18.Ba3+=) 16.Ne1 (16.c5 Qc7+=) 16...a6 (16...c5 17.a5 Qd6 18.Nef3+=) 17.a5 (17.c5 Qc7+=) 17...Qd8 18.Ne4 (18.bc6 bc6 19.Ne4 fe4=) 18...fe4 19.bc6 bc6 20.Qa4 (20.Ba3 c5=) 20...Rb8 21.Bc3 Qc7 22.g3 Nf6 23.Ng2 c5 24.Rfc1 Bd7–/+ 25.Qa2 cd4 26.Bd4=+ Qb7 27.Bb6 Bd6 28.Rab1 Qa8 29.c5 Be5 30.Ne1 h5 31.f4!+/– ef3 32.Nf3 Ng4 33.h3 Rf3 34.Bf3 Rf8 35.Qe2 Bg3? 36.hg4 hg4 37.Bg4 Rf2 38.Qd3 Qf8 39.Rf1 e5 40.Bd7 Qf3 (40...Bh2 41.Kh1 Qf3) –+. Tuchtenhagen,Harald – Hubert,Peter, GER LL–chT Germany, 1995.

4.Be5 c5 5.Nc3 e6 6.e3 (6.Nf3 d4 7.Ne4 Qa4+=) 6...Qa5 (6...Nd7 7.Bf4=) 7.Nf3 Nd7 8.Bg3 (8.Bf4 Ngf6=) 8...Ngf6 (8...c4 9.Rb1=) 9.Be2 Nh5 10.Bh4 Bd6 11.Ng5 (11.0–0 0–0=) 11...Nhf6 12.f4 (12.0–0 e5=) 12...h6=+ 13.Nf3 d4 (better is 13...Ng4!?=+) 14.ed4+= cd4 15.Nd4 Bf4 16.0–0 Be5 (16...Qc7 17.Nf3=) 17.Bf2 Qc7 18.h3 Nc5 (18...0–0 19.Qe1=) 19.Bf3 (19.Be3 0–0 20.Qe1 Bg3=) 19...0–0 20.Nc6 (20.Qe2 Rd8 21.Nb3 Nb3 22.ab3 Bc3=) 20...Bc3 (< 20...bc6 21.Bc5 Bc3 22.dc3=) 21.dc3 Nce4 22.Qd4 Nf2 23.Na7 Nh3 24.gh3 Qg3 25.Bg2? e5 26.Qb6 Bh3 27.Rf2 Ng4 28.Re2 Qh2 29.Kf1 Bg2 30.Rg2 Qh1 31.Rg1 Qf3 32.Ke1 Qc3 (33.Ke2 Qc2 34.Kf3 f5 35.Qe6 Kh7–+) 0–1. Kreuzer,U – Ludwig, Mannschaftspokal, 1992.

4.Bg7?? Bg7–+ 5.c3 (5.a3 Qb2 6.Nc3 Bc3–+) 5...Qb5 (better 5...Qb2 6.Na3 Qa3 7.e3–+) 6.a4 Qc6 7.a5 (7.e3 Nd7–+) 7...a6 8.e3 h5 9.Qb3 b5 10.h3 (10.ab6 cb6 11.d4 b5–+) 10...Be6 (10...Nd7 11.Ne2–+) 11.Nf3 d4 12.c4 (12.Qc2 de3 13.de3 Nd7–+) 12...bc4 (better 12...d3 13.Nc3 Qc4–+) 13.Bc4 (13.Qb2–+) 13...Bc4 14.Qa4 (14.Qd1 de3 15.Ra3 ef2 16.Kf2 Nf6–+) 14...Bb5 15.Qd1 (15.Qa3 de3 16.fe3 Ba1 17.Qa1 Nf6–+) 15...de3 16.Nc3 (16.d4 Bd4! 17.Qd4 Qc1 18.Qd1 Qb2 19.fe3 Qa1–+) 16...ef2 (better 16...ed2 17.Nd2 Bc3–+) 17.Kf2 h4 (17...Qc5 18.Kg3–+) 18.Rc1 Qc5 19.d4 Qa7 (19...Qd6 20.Re1 Nc6 21.Kg1–+) 20.Nb5 (20.Re1–+) 20...Qb7 (better 20...ab5 21.Re1 Qa5–+) 21.Nc7=+ Kd8 22.Na8 Qa8 23.Qc2 Threatening mate... how? 23...Nd7?? (23...Qb7 24.Rb1 Qa7+–) 24.Qc7 Ke8 25.Qc8 Qc8 26.Rc8 1–0. MARYMARY – Coach Millser, ChessWorld.net, 2018.

4.Ba3 Qb5

5.Nc3 Qd7 6.Rb1 Nf6 (6...d4 7.Ne4–/+) 7.e3 e6 (7...e5 8.Bf8 Rf8 9.Nf3–/+) 8.Bb5 c6 9.Be2?? (better 9.Bf8 Rf8 10.Be2–/+) 9...Ba3–+ 10.Nf3 Bd6 11.Ng5 (11.0–0 e5–+) 11...h6 12.Nf3 Qc7 13.a4 e5 14.0–0 (14.d3 Nbd7 15.Qd2 b6–+) 14...0–0 (14...e4 15.Nd4 Bh2 16.Kh1–+) 15.Ne1 (15.h3 Qa5–+) 15...e4 16.f4 Bf5 (16...Bc5 17.Kh1–+) 17.Na2 Nbd7 18.Nb4 (18.g4 Bh7–+) 18...a5 (18...c5 19.Na2–+) 19.Na2 Nc5 20.Nc3 Qd7 21.Bh5 (21.d3 ed3 22.cd3 Rab8–+) 21...Rfb8 (better 21...Be7 22.Be2 d4 23.ed4 Qd4 24.Kh1 Rad8–+) 22.g3 (22.Be2 Be7–+) 22...b5 (22...Nh5 23.Nd5 cd5 24.Qh5 Na4 25.Ra1–+) 23.Rf2 (23.ab5 cb5 24.Be2 b4–+) 23...b4 24.Na2 (24.g4 Bg4 25.Bg4 Ng4 (25...bc3?! 26.Bd7 Ncd7 27.dc3=+) 26.Ne4 de4–+) 24...Na4 (24...Nh5 25.h3 Nf6 26.g4–+) 25.Ng2 (25.Be2 Nb6–+) 25...Nh5 26.Qh5 (26.h3 Nf6 27.g4 Bh7–+) 26...Bg4 27.Qh4 Be7 28.f5 Bh4 29.Nh4 Nc5 0–1. Akrapovik (1685) – IPaddy (2105), lichess.org, 2021.

5.e3 Qb6 6.Nc3 Be6?? (6...Qa5 7.Qc1–/+) 7.Nf3?? (7.Rb1!? Qa5 8.Bb4+–) 7...Nc6 (7...c6 8.Rb1 Qc7 9.d4=+) 8.Bb5 (8.Rb1 Qa5 9.Rb7 a6+– (9...Qa3? 10.Nb5 Bc8 11.Na3 Bb7 12.Qb1+–)) 8...Qa5= 9.Bc6 (9.Qc1 a6 10.Bc6 bc6=) 9...bc6=+ 10.Qc1 Bg4 (10...Rb8 11.Nd4 Bd7 12.Nb3=+) 11.Nd4 (better 11.Ne5 Bd7 12.Rb1=) 11...e5?? (better 11...Qa6=+) 12.Nc6?? (better 12.Bf8 Kf8 13.Nc6+–) 12...Qa3–+ (12...Ba3?! 13.Na5 Bc1 14.Rc1=) 13.Qa3 (13.Qb1 Qa6 14.Ne5 Be6 15.Qb5 Qb5 16.Nb5 Bd6 17.Nd6 cd6–+) 13...Ba3 14.Ne5 Bb2 15.Nd5?? (15.Rb1 Bc3 16.dc3–+) 15...Be5 (worse 15...Ba1 16.Ng4 0–0–0 17.Ke2 Rd5 18.Ra1–+) 16.f4 (16.d4 Be6 17.c4–+) 16...Ba1 17.Nc7 Kd7 18.Na8 Nf6 (better 18...Nh6 19.0–0 Bf6 20.h3–+) 19.Kf2 (19.0–0 Bb2 20.Rb1 Rb8–+) 19...Ra8 (better 19...Ne4 20.Kg1 Nd2–+) 20.Ra1 Ne4 (20...Rc8!? 21.Rc1–+) 21.Ke1 Rc8 22.c3 (22.h3 Be6 23.d3 Nc3–+) 22...Rb8 23.h3 (23.c4 Rb2 24.h3 Be6–+) 23...Bf5 (23...Be6 24.Rd1 Ba2 25.c4–+) 24.g4 Ng3 (better 24...Be6 25.Rd1 Ba2–+) 25.gf5–/+ Nf5 26.Ke2 Ng3 (26...Nd6 27.Kd3–/+) 27.Kf3 Nh5 28.a4 (28.e4!?–/+) 28...Rb2–+ 29.d4 Rh2 (29...f5!? 30.c4–+) 30.Rb1–/+ Rh3 (better 30...Kc7–/+) 31.Ke4? (better 31.Kg4 Re3 32.Kh5 Rc3 33.Rb7 Rc7 34.Rb5–/+) 31...Nf6–+ 32.Kd3 Nd5 33.Rb7 Ke6 34.Ra7 (34.f5 Kf6 35.Ra7 Ne3 36.Ke4–+) 34...h5?? (better 34...Re3 35.Kd2 Rg3 (35...Rc3?! 36.Ra6 Kf5 37.Rd6–+) 36.f5 Kf5–+) 35.Ra6–/+ Kf5 (better 35...Kd7!? 36.Ra7 Kd6–/+) 36.Ra5= Ke6 37.c4 (37.Ra6 Kd7 38.Ra7 Kc6–+) 37...Nb4 (37...Nf4!? 38.Kd2 Rh2 39.Kc3 Ne2 40.Kd3 Nc1 41.Ke4 Rh4 42.Kf3 Nb3 43.Re5 Kf6–+) 38.Ke4 (38.Kc3 Na2 39.Kb2 Rh2 40.Kb3 g6=) 38...f5 39.Rf5 g6?? (better 39...Re3! 40.Ke3 Kf5–/+) 40.Re5 (40.Rb5 Nc2 41.Rb3 Rg3+–) 40...Kd6 (40...Kd7 41.Rb5 Nc2 42.Rb7 Kc8 43.Rb3+–) 41.a5 (41.Rb5 Nc2 42.c5 Kc7+–) 41...h4 (41...Nc2 42.Kd3 Nb4 43.Ke2+–) 42.Rg5 (42.Rb5 Nc2 43.c5 Kc7 44.Rb3=) 42...Rh1? (better 42...Rg3 43.Rg3 hg3+–) 43.Rg6 Kc7 44.Rh6 (44.Rg7 Kc6+–) 44...h3 (44...Nc2 45.Rh7 Kc6 46.Kd3 Nb4 47.Ke2 Rh2 48.Kf3 Rh3 49.Kg4 Re3 50.Rh4+–) 45.c5 Na6 (45...Na6 46.Ra6 Ra1+–). Abdullaevich (1895) – ranjanTripathi, lichess.org, 2020.

5.e3 Qd7 6.Nf3 a6 7.c4 Nc6 8.cd5 Qd5 9.Nc3 Qd8 10.d4 g6 11.Qb3 Bg7 12.d5 Ne5 13.Nd4 Nh6 14.h3 0–0 15.Be2 Nf5 16.Nf5 Bf5 17.e4 Bc8 18.0–0 Nd7 19.Rad1 b5 20.f4 Bb7 21.e5 c5 22.dc6 Bc6 23.Bf3 Qb6 24.Kh1 (24.Kh2 Nc5 25.Bc5 Qc5 26.Bc6 Qc6+=) 24...Nc5+= 25.Qb4 Rfc8 26.Bc6 (26.Nd5 Bd5 27.Rd5 a5=) 26...Qc6 27.Nd5 Ra7 28.Qd4 e6 29.Nf6 (29.Bc5 Qc5 30.Nb6 Qd4 31.Rd4 Re8+=) 29...Bf6–/+ 30.ef6 Rac7 31.Qe5 h6 32.Rd6 Qe4 33.Rd8 (better is 33.Bc5!? Qc4 34.Qa1 Rc5 35.Ra6–/+) 33...Rd8–+ 34.Qc7 Qd5?? (34...Rd2 35.Rf3 Rd1 36.Kh2+=) 35.Rf3?? (better is 35.Bc5 Rd7 36.Qe5+–) 35...Qd1 (35...Ne4!?–/+) 36.Kh2 Ne4 (36...Na4 37.Be7 Ra8 38.f5 ef5 39.Qb7=) 37.Be7+= Ra8 38.Qc6 Qd5 39.Qd5 ed5 40.Rd3 a5 41.a3 (better is 41.Rd5!? Nc3 42.Rd2=) 41...Rb8–/+ 42.Rd5 b4 43.ab4 ab4 44.Rd4 b3 45.Re4 b2 46.Re1 b1Q 47.Rb1 Rb1 48.g4 h5 49.Kg3 Rb5 50.Kh4 hg4 51.hg4 g5 52.fg5 Rb3 53.Bd6 Rc3 54.Be7 Rd3 55.Bc5 Rc3 56.Bd6 Kh7 57.Bf8 Kg6 58.Bh6 Rd3 59.Bf8 Rd1 60.Bh6 Rd5 61.Kg3 Rg5 62.Bg5 Kg5 63.Kf3 Kf6 64.Kf4 Kg6 65.g5 ½–½. Taus,M (2130) – Denisov,I (2300), Ostravsky Konik A, 2011.

5.e3 Qa5

6.c4 dc4 7.Bc4 Nf6 8.Qb3 e6 9.Bb2 Be7 10.Nc3 0–0 11.Nf3 Rd8 12.0–0 c5 13.Qb5 Nc6 14.Qa5 Na5 15.Bb5 a6 16.Ba4 b5 17.Bc2 Bb7 18.a4 (18.Nb1–+) 18...Nc4 19.Rfd1 (19.Bc1 Bf3 20.gf3 Nd2 21.Bd2 Rd2–+) 19...b4 (better is 19...Bf3 20.gf3 Nb2 21.Rdb1 Na4 22.Na4 ba4 23.Ra2–+) 20.Ne2 (20.Bc1 bc3 21.dc3–+) 20...Nb2 21.Rab1 (21.Rdb1 Bf3 22.gf3 Nc4–+) 21...Nd3 (better is 21...Nd1 22.Rd1 c4 23.Ne5–+) 22.Bd3 Rd3 23.Ne5 Ra3 24.Nc4 Ra2 25.Ra1 (25.Nc3 Rc2 26.Na3 ba3 27.Rb7 Kf8–+) 25...Ra1 26.Ra1 Be4 27.Nb6 (27.Nc1 Rd8–+) 27...Rb8 28.Nc4 (28.f3 Bc2 29.Nc4 Bd3–+) 28...Bd3 29.Nf4 0–1. Galaxy7 – AsylumAndTerror2, Live Game Caissa's Web, 2004.

6.c4 e6 7.Bf8=+ Kf8 8.Nc3 Nf6 9.Nf3 c6 (9...Kg8 10.Rb1=+) 10.Be2 (10.Qb3 dc4 11.Bc4 b5=+) 10...Ke7 (10...dc4 11.Bc4 b5 12.Bd3=+) 11.0–0= Rd8 12.Qc2 dc4 13.Bc4 Nbd7 (13...Kf8 14.d4=+) 14.d4= b5 (14...Kf8!?=) 15.Bd3+= Bb7 16.a4 (16.Nd2!?+=) 16...b4=+ 17.Ne4 Rac8 (17...Ne4 18.Be4 f5 19.Bc6–+) 18.Nfd2= Qc7 (18...c5 19.Nb3 Qc7 20.Nec5+=) 19.Nc5+= a5 20.Ndb3 (20.Bh7? Rh8 (20...Nh7?! 21.Nb7 Qb7 22.Qh7=+) 21.Nd7 Kd7–+; 20.Nb7 Qb7 21.Nb3 c5 22.dc5 Nc5 23.Nc5 Qa7=+) 20...Ra8 21.Rac1 (21.Rab1 Nc5 22.Nc5 Rab8+=) 21...Nc5 22.Qc5 (22.Nc5 Rab8+=) 22...Ke8= 23.e4 (23.Rfe1 Ba6 24.Bb1 Rd5 25.Qc6 Qc6 26.Rc6 Bc8=) 23...h6 (23...e5 24.Rfd1=+) 24.f4 (24.Rfd1 Ba6 25.Ba6 Ra6=) 24...Ba6 25.Ba6 Ra6 26.f5 (26.Qc2 Rb6=) 26...ef5 (26...Ng4 27.g3 e5 28.d5=+) 27.Rf5= Ng4 28.g3 Qe7 (28...Qa7 29.h3 Qc7 30.Rf3=) 29.Qc4 (29.Qe7 Ke7 30.Ra5 Rda8 31.Ra6 Ra6+/–) 29...Ne3 (29...Rda8 30.Qd3 g6 31.Rfc5+=) 30.Qa6+= Nf5 31.Qc6 Kf8 32.Rd1 Qg5 (32...Ne3 33.Re1 Nf5 34.d5 Qa7 35.Kg2=) 33.Rd3+= (< 33.ef5 Qe3 34.Kh1 Qb3–/+) 33...Nd4? (better is 33...Nd6+=) 34.Nd4+– Rd4? (better is 34...Kg8 35.Qc7 Rd4+–) 35.Qa8 (35...Ke7 36.Qa7 Kf8 37.Qd4+– (37.Rd4?! Qe3 38.Kf1 Qf3 39.Ke1 Qh1 40.Ke2 Qh2 41.Kd3 Qg3 42.Kc4 Qc3 43.Kb5 g5+–)) 1–0. Ng,Gary (2130) – Kenney,Jason (2140), NS Closed, 2005.

6.c4 Nf6 7.Bb2 –/+.

6.c4 Nf6 7.Qb3 Nbd7 8.Nc3 e6 9.Bf8 Kf8 10.Nf3 Nc5 11.Qb2 Rb8 (11...Nce4 12.Bd3=+) 12.Be2 dc4 13.Bc4 b5 14.0–0 b4 (14...Nfd7 15.Be2=+) 15.d4 (15.a3 b3=) 15...Nce4 (better is 15...Bb7 16.Ne2 Bf3 17.gf3 Nb7–/+) 16.Ne4+= Ne4 17.Qc2 Bb7 18.Ne5 Ke7 19.f3 Nd6 20.Bb3 Qb6 (20...f6 21.Nd3=) 21.Kh1 (21.Rfc1 Rbc8+=) 21...h5 (21...f6 22.Nd3=) 22.e4 (22.Rfc1 Rbc8+=) 22...Rh6 (22...Rhd8 23.Qd2=) 23.Qd2 (23.Ba4 Rc8 24.Rfd1 h4+=) 23...f6= 24.Nc4 White terminates the opponent with strong threats 24...Qb5 (24...Nc4 25.Bc4 Rd8 26.Rfd1=) 25.Rac1 Rc8 26.e5 Nf7 (26...Nc4 27.Bc4 Qb6 28.a3=) 27.ef6 gf6 (27...Rf6!? 28.Ne3 Nd6+=) 28.Rfe1 Bd5 29.Ne3 Kf8 (29...Bb3 30.Rc5 Qa6 31.Nf5 Kd7 32.Nh6 Qa2 33.Qa2 Ba2 34.Nf7 Bd5+–) 30.Rc5 Qb7?? (30...Qb8 31.Nd5 ed5 32.Bd5 Rg6+–) 31.Nd5 (31...ed5 32.Bd5+–; 31.Bd5?! ed5 32.Nd5 h4+–; 31.Rd5?! ed5 32.Nd5 Rd8+/–) 1–0. Hohn,Jan – Moll, 1982.

6.c4 Nf6 7.Nf3 Bf5 8.Qb3 Qb6 9.c5 Qb3 10.ab3 Nbd7 11.d4 e5 12.Be2 Be7 (12...e4 13.Nfd2–/+) 13.0–0 (13.c6 bc6 14.Be7 Ke7 15.de5 Ng8=+) 13...ed4 (13...e4 14.Nfd2–/+) 14.Nd4=+ Bb1 15.Rfb1 c6 16.b4 a6 17.Nf5 Bf8 18.Bb2 g6 19.Ng3 Bg7 20.Bd4 0–0 21.h4 Rfe8 Black gets the initiative 22.h5 Ne4 23.Ne4 Bd4 24.Nd6 Ba1 25.Ne8 Be5 26.f4 (better is 26.Nd6 Bd6 27.cd6–+) 26...Re8 27.fe5 Re5 28.hg6 hg6 29.Kf2 Nf6 30.Bf3 Ne4 31.Be4 Re4 32.Kf3 Kg7 33.g4 (33.Ke2 f5 34.Kd3 Kf6–+) 33...Kf6 34.g5 Kg5 35.Rg1 Kf6 (36.Rb1 g5–+) 0–1. Schraml,Veronika – Wutz,Christoph, Erbendorf GER, 2006.

6.Nf3 Nf6 =+.

5.e4 Qa5

6.ed5 Qd5 7.Nc3 Qa5 8.Bb2 Nf6 9.Nf3 c6 10.Bc4 Bg4 11.0–0 Nbd7 12.d4 e6 13.h3 Bf3 14.Qf3 Bd6 15.Rfe1 0–0 16.Ne4 Ne4 17.Re4 Nf6 18.d5?? (better is 18.Ree1–/+) 18...Ne4–+ 19.de6 (19.Qe4 cd5 20.Qg4 e5–+) 19...Ng5 20.Qg4 (20.ef7 Nf7 21.Rd1 Qb4–+) 20...Ne6 (better is 20...Be5 21.Be5 Qe5 22.ef7 Nf7–+) 21.Be6 Be5 22.Qf5 fe6 (better is 22...Rae8!? 23.Qe5 Qe5 24.Be5 Re6 25.Bd4–+) 23.Qe6 Kh8 24.Be5?? (better is 24.Qe5 Qe5 25.Be5–+) 24…Rae8 (24...Rae8 25.Bg7 Kg7–+) 0–1. Rogalevych,O – Ipatov,Alexander (2295), UKR–ch sf U20, 2007.

6.ed5 Nf6 7.c4 c5 8.Qb3 (8.Bb2 Bf5=) 8...Qc7 (8...g6 9.Bb2+=) 9.Nf3 Bg4 (9...e5 10.de6 Be6 11.Bb2=) 10.Be2 Nbd7 11.0–0 g6 12.Nc3 Bg7 13.Rab1 (13.d4 0–0+=) 13...b6= 14.Nb5 (14.h3 Bf3 15.Bf3 Ne5 16.Qa4 Qd7 17.Qd7 Kd7+=) 14...Qb8 15.h3 Bf5 16.Bd3 (16.d3 a6 17.Nc3 Nh5=) 16...Bd3 17.Qd3 a6 18.Nc3 0–0 19.Ne4 Ne4 (19...Qf4 20.Rfe1=) 20.Qe4 Re8 21.Bb2 (21.d4 cd4 22.Nd4 Qe5 23.Qe5 Ne5=) 21...e6 (21...Bb2 22.Rb2 e5 23.de6 Re6 24.Qh4=) 22.Bg7 Kg7 23.Rfe1 (23.de6 Re6 24.Qh4 Re8=) 23...Nf6 24.Qd3 (24.Qc2 ed5 25.Re8 Ne8 26.Qb2 Nf6 27.cd5 b5=) 24...Qd6+= 25.Qb3 Rab8 (25...ed5 26.Re8 dc4 27.Qb6 Ne8 28.Qb2 Qf6 29.Qf6 Nf6 30.Rc1=) 26.de6 Re6 27.Re6 Qe6 28.Re1 (28.d4 Qd6=) 28...Qd6 29.Qc3 (29.Qa3 b5=) 29...Rd8 30.Re5 Qd3 31.Qb2 (31.Qc1 Re8=) 31...Qd6 (31...Rd6 32.Qb3+=) 32.Rd5 (32.Qa3 a5=) 32...Qe7 33.Rd8 Qd8 34.Qe5 (34.Qa3 Qc8=) 34...Qe8 (34...Qd3 35.Qb2+=) 35.Qc7= Nd7 36.Qb7 a5 37.Qc6 Qe6 38.Qc7 h6 39.d3 Nf6 40.a4 Ne8 41.Qb8 Nf6 42.Ne5 Nd7 (42...Nh5 43.Ng4=) 43.Nd7 Qd7 44.Qb6 Qa4 45.Qc5 Qa1 (45...Qd1 46.Kh2 Qd3 47.Qa5 Qc4 48.Qe5 f6 49.Qe7 Qf7 50.Qf7 Kf7 51.f4=) 46.Kh2 a4 47.d4 a3 48.Qe5 Kh7 (48...Kg8 49.Qe3 Qb2 50.Qe8 (50.Qh6?? Qd4 51.Qc1 a2–+) 50...Kg7 51.Qe5 Kh7 52.Qe7 Qd4 53.Qa3 (53.Qf7?? Qg7 54.Qf3 a2–+) 53...Qc4 54.Qd6=) 49.Qf6 (49.Qd5 Kg8 50.c5 Qc1+=) 49...Kg8= 50.Qe7 Qb2 51.Qe8 Kg7 52.Qe5 Kf8 (better is 52...Kh7 53.Qe7 Qd4 54.Qa3 Qc4=) 53.Qd6?? (better is 53.c5 Qc2 54.Qh8 Ke7 55.Qb8=) 53...Kg8–+ 54.Qd8 (54.f4 a2 55.f5 g5–+) 54...Kg7 55.Qe7 Qb8 (55...Qd4?! 56.Qa3 Qc4 57.Qa1 f6 58.Qa7 Qf7 59.Qf7 Kf7 60.Kg3=) 56.g3 a2 0–1. Lorenc,T – Vesely,T, 2.CLV InfPard–SyntPa, 1999.

6.ed5 Nf6 7.c4 c6 8.dc6?? Qe5–+ 9.Be2 (9.Ne2 Qa1 10.Nec3 Nc6–+) 9...Qa1 10.Qb3 (10.cb7 Bb7 11.Nf3 Qa2–+) 10...Nc6 11.Qb2 (11.Nf3 e5 12.0–0 Nd4 13.Nd4 Qd4–+ (worse is 13...ed4 14.Bb2 Qb2 15.Qb2+–)) 11...Qb2 12.Bb2 Bf5 13.Nc3 e5 14.Nf3 0–0–0 15.0–0 e4 16.Ng5 (16.Nh4 Rd2 17.Bc1 Rc2 18.Nf5 Rc3–+) 16...Rd2 17.Bc1 (17.Ba1 Bb4 18.Rd1 Rhd8 19.Nf7 Bc3 20.Rd2 Bd2 21.Nd8 Kd8–+) 17...Rc2 18.Nf7 Rc3 19.Nh8 Nd4 20.Bb2 (20.Bh5 Nh5 21.Be3 Rc4–+) 20...Ne2 21.Kh1 Rc2 22.Bf6 gf6 0–1. Hasler,Ulrich (1680) – Gatto,Claudio (2200), 1st Webchess Open Tournament group, 2005.

6.ed5 Nf6 7.c4 c6 8.Nf3 –/+.

6.ed5 Nf6 7.Nf3 –/+.

5.e4 Qd7

6.ed5 Qd5

7.Nc3 Qd8 8.Nf3 Nf6 9.Bc4 e6 (9...Nbd7 10.0–0 Nb6 11.Be2=+) 10.Bf8 Kf8 (10...Rf8 11.0–0=+) 11.0–0 g6 (11...Kg8 12.Re1=+) 12.d4 (12.Ne5 Kg7=) 12...Nbd7 (12...Kg7 13.Ne5=) 13.Qd2 (13.Ne5 Kg7=) 13...h6 (13...Kg7 14.Qf4=+) 14.Rfe1 (14.Qe3 Kg7=) 14...c6 (14...Kg7 15.Qe3=) 15.Re2 (15.Qf4 Kg7=) 15…Qa5 ½–½. Pietrzak,Janusz – Chromik,J, Poland, 1988.

7.Nc3 Qe5 8.Be2 Nf6 9.Nf3 (9.Nb5 Nd5+=) 9...Qa5–/+ 10.Qc1 c6 (10...e5 11.Bf8 Rf8 12.Bd3+=) 11.0–0+= b5 (11...e5 12.Bf8 Kf8 13.Re1+=) 12.Qb2 (12.Rb1 Nbd7+=) 12...e6 Black intends b4 (12...Na6 13.Rfb1+=) 13.Bf8= Rf8 14.Rfe1 b4 15.Nd1 Ba6 16.d3 Nbd7 17.Nd4 (17.a3 ba3 18.Ra3 Qb6=) 17...c5+= 18.Bf3 Rc8 Black prepares the advance c4 19.Nf5 Kd8 20.Ng7 (20.Nd6!? Rb8 21.Ne3+=) 20...c4–/+ 21.Qd4 (21.dc4 Rg8 (worse is 21...Bc4 22.Ne3+=) 22.Ne3 Rg7–/+) 21...b3 (21...Rg8 22.Ne6 fe6 23.Re6 Re8 24.Re8 Ke8–+) 22.Nc3? (22.Ne3 b2 23.Rab1 cd3 24.Red1–+) 22...cd3–+ 23.Ne4 Ne4 (23...Qe5 24.Qe5 Ne5 25.ab3 Nf3 26.gf3 Ne4 27.fe4 dc2–+ (27...Rc2?! 28.Ra6 Rg8 29.Rd1 Rg7 30.Kf1=)) 24.ab3+= Qc3 25.Qe4 dc2 26.Qe3?? Qe3–+ 27.fe3 Nf6 28.Rec1–/+ Bd3 29.Nh5 Nh5–+ 30.Bh5 Rc7 31.Ra4 Ke7 32.Rd4 Rd8 33.Rd8 Kd8 34.Kf2 Ke7 35.Be2 Be2 36.Ke2–/+ Rc3 37.Kd2 Rb3 38.Rc2 Rb7 39.g3 a5 40.Kc3?? Rc7–+ 41.Kb3 Rc2 42.Kc2 Kd6 43.Kb3 Kd5 44.Kc3 Ke4 45.Kd2 a4 0–1. Reimer,Karl (1700) – Kuerner,Rainer (1880), Ludwigshafen–ch, 1998.

7.Nc3 Qe6 8.Nge2 =+.

7.c4?? Qd7 (better 7...Qe5 8.Be2 Qa1–+) 8.Nc3 c6 9.Nf3 Nf6 10.Be2 Qc7 11.h3 Nbd7 12.0–0 e6 13.d4?? (better 13.Bf8 Nf8 14.d4=+) 13…Ba3–+ 0–1. GuestSKYR – GuestVTHWY, freechess.org, 2017.

7.Nc3 Qa5

8.Bb2 Nc6 A) 9.Nf3 Nf6 (9...e5 10.Bb5 Bd7 11.0–0 Bd6 12.Re1 0–0–0 13.Rb1 Nf6 14.Ng5 Rhf8+=; 9...Bd7 10.Bc4 Nf6 11.Rb1 e6 12.0–0 Bc5 13.Nb5 0–0–0 14.Ne5 Rhf8+=; 9...a6 10.Bc4 Nf6 11.0–0 e6 12.Qe2 Bd6 13.Rfe1 0–0 14.Ne4 Ne4–/+) 10.Bb5 Bd7 11.0–0 e6 12.Re1 Bd6 13.Bd3 Nb4 14.Be4 0–0–0–/+; B) 9.Bc4 e5 (9...Nf6 10.Nf3 Qb4 11.Bb3 Bf5 12.Rb1 e6 13.Ba4 Qc5 14.Nh4 Bg4+=; 9...e6 10.Nf3 Qb4 11.Bb3 Nf6 12.Rb1 Bd7 13.Qe2 Qg4 14.0–0 Bc5+=; 9...Bf5 10.Bb5 Bd7 11.Nf3 a6 12.Bc4 Nf6 13.0–0 e6 14.Rb1 Bd6–/+) 10.Nf3 Bd6 11.Qe2 Nf6 12.Ne4 Bf5 13.Nf6 gf6 14.Bd3 Bg6–/+; C) 9.Rb1 Nf6 (9...e5 10.Bb5 Nge7 11.Qh5 a6 12.Bc4 g6 13.Qf3 f5 14.Nge2 Bg7+=; 9...a6 10.Bc4 Nf6 11.Nf3 e6 12.Qe2 b5 13.Bb3 Bb7 14.Ne4 Ne4–/+; 9...Nd4 10.Nf3 Bg4 11.Be2 Ne2 12.Qe2 Nf6 13.h3 Bh5 14.Qe5 Qe5–/+) 10.Nf3 a6 11.Bc4 e6 12.0–0 Bd6 13.Qe2 b5 14.Bd3 e5–/+; D) 9.Bb5 Bd7 10.Nf3 e5 11.0–0 Bd6 12.Re1 0–0–0 13.Rb1 Nf6 14.h3 Rhe8+=.

8.Bb2 Nd7 A) 9.Bc4 Qb4 (9...e5 10.Nf3 Qb4 11.Bb3 Bd6 12.Nd5 Qe4 13.Ne3 Nh6 14.d4 0–0–/+; 9...Ngf6 10.Nf3 e6 11.0–0 Qb4 12.Bb3 Bd6 13.Re1 0–0 14.Qe2 Qg4–/+; 9...Nb6 10.Bd3 e5 11.Nb5 Nd7 12.Qe2 f6 13.Bc3 Qb6 14.f4 Nc5+=) 10.Bb3 Ngf6 11.a3 Qc5 12.Nge2 e6 13.Ba4 Be7 14.0–0 0–0–/+; B) 9.Be2 e5 (9...Ngf6 10.Nf3 e5 11.0–0 Be7 12.d4 0–0 13.Qd3 ed4 14.Nd4 Re8–/+; 9...Ndf6 10.Nf3 e5 11.0–0 e4 12.Nd4 Qb6 13.Na4 Qd6 14.Nb5 Qc6+=; 9...c6 10.Nf3 e5 11.Bc4 Qb4 12.Bb3 Bd6 13.Ng5 Nh6 14.Nce4 Bc7+=) 10.Nf3 Ngf6 11.0–0 Be7 12.Rb1 0–0 13.Re1 Bd6 14.Bd3 Re8–/+; C) 9.Nf3 a6 (9...Ngf6 10.Bc4 e6 11.0–0 Qb4 12.Bb3 Bd6 13.Re1 0–0 14.Qe2 Qg4–/+; 9...e6 10.Qe2 Ngf6 11.Qb5 Qb6 12.Rb1 Bc5 13.Qb6 Bb6 14.Na4 Ba5–/+; 9...e5 10.Bc4 Qb4 11.Bb3 Bd6 12.Nd5 Qe4 13.Ne3 Nh6 14.d4 0–0–/+) 10.Bc4 Nb6 11.Bb3 Bg4 12.Qe2 Qh5 13.Qe5 Bf3 14.Qc7 Bg2–/+; D) 9.Bd3 Ngf6 (9...e5 10.Nf3 Ngf6 11.Qe2 Be7 12.Ne4 Nd5 13.Ne5 Nf4 14.Qg4 Ne5+=) 10.Nf3 e5 11.Qe2 Be7 12.0–0 0–0 13.Rfe1 Re8 14.a3 Bd6–/+.

8.Bb2 e5 A) 9.Bc4 Nf6 (9...Qb4 10.Bb3 Nf6 11.Nf3 Bd6 12.0–0 0–0 13.Re1 Nc6 14.Rb1 Qa5–/+; 9...Nc6 10.Nf3 Bd6 11.Qe2 Nf6 12.Ne4 Bf5 13.Nf6 gf6 14.Bd3 Bg6–/+; 9...Bd6 10.Qh5 Nh6 11.Nd5 Bf5 12.Nf3 Nc6 13.Qg5 0–0 14.0–0 Qc5–/+) 10.Qe2 Bd6 11.Nb5 Nc6 12.f4 Bg4 13.Nf3 0–0 14.Bc3 Qb6–/+; B) 9.Rb1 Nf6 (9...Nd7 10.Nf3 Ngf6 11.Bb5 Bd6 12.0–0 a6 13.Bc4 b5 14.Bb3 b4–/+; 9...Be6 10.Ba1 Bb4 11.a3 Bc3 12.Bc3 Qd5 13.f4 Nd7 14.fe5 Ne5=; 9...Bd6 10.Bb5 c6 11.Ne4 Bf8 12.Bc4 Bf5 13.Ng3 Bg6 14.Nf3 Nd7+=) 10.Bc4 Bd6 11.Qf3 0–0 12.Nge2 Nc6 13.Nd5 Nd5 14.Bd5 Nb4–/+; C) 9.Qe2 a6 (9...Nc6 10.Nb5 a6 11.Nd4 Nge7 12.Nb3 Qd5 13.c4 Qd6 14.Nf3 f6–/+; 9...Bd6 10.Nb5 Nc6 11.Bc3 Qa4 12.d4 Bb4 13.Bb4 Qb4 14.c3 Qe7+=; 9...Be6 10.Nf3 Nc6 11.Qb5 Qb5 12.Bb5 Bd7 13.Bc6 Bc6 14.Ne5 Bg2=) 10.f4 Nc6 11.Nf3 Bf5 12.0–0–0 Ba3 13.Re1 0–0–0 14.fe5 Nb4–+; D) 9.Nf3 Nf6 (9...Bf5 10.Bc4 Qb4 11.Bb3 Nd7 12.Nd5 Qd6 13.Qe2 0–0–0 14.Ne5 Nh6=; 9...Bg4 10.Bc4 Nf6 11.Qe2 Nbd7 12.Rb1 Bb4 13.h3 Bf5 14.Bb3 h6–/+; 9...Nd7 10.Bc4 Qb4 11.Bb3 Bd6 12.Nd5 Qe4 13.Ne3 Nh6 14.0–0 0–0+=) 10.Bc4 Qb4 11.Bb3 Bd6 12.0–0 0–0 13.Re1 Nc6 14.Rb1 Qa5–/+.

8.Bb2 Nf6 A) 9.Bc4 e5 (9...e6 10.Nf3 Qb4 11.Bb3 Bd6 12.Qe2 Bd7 13.Ne5 0–0 14.Nc4 Qc5–/+; 9...Qb4 10.Bb3 e5 11.Nf3 Bd6 12.0–0 0–0 13.Re1 Nc6 14.Rb1 Qa5–/+; 9...Bg4 10.f3 Bf5 11.Nb5 e6 12.Bc3 Qb6 13.Nd4 Qc5 14.Qe2 Nbd7+=) 10.Nf3 Qb4 11.Bb3 Bd6 12.0–0 0–0 13.Re1 Nc6 14.Rb1 Qa5–/+; B) 9.Rb1 e5 (9...e6 10.Nf3 Bc5 11.Bd3 0–0 12.0–0 Nc6 13.Nb5 Nd5 14.Ng5 h6–/+; 9...c6 10.Nf3 e5 11.Bc4 b5 12.Bb3 b4 13.Qe2 Ba6 14.Qe5 Qe5+=; 9...Nbd7 10.Nf3 e5 11.Bb5 Bd6 12.0–0 a6 13.Bc4 b5 14.Bb3 b4–/+) 10.Bc4 Bd6 11.Qf3 0–0 12.Nge2 Nc6 13.Nd5 Nd5 14.Bd5 Nb4–/+; C) 9.Bb5 Bd7 (9...Nbd7 10.Nf3 a6 11.Bc4 Nb6 12.Bd3 e5 13.Qe2 Bd6 14.Ne4 Na4–/+; 9...c6 10.Bc4 e5 11.Nf3 Bd6 12.Qe2 Bf5 13.Bd3 Bd3 14.Qd3 Qb4–/+) 10.Qf3 Nc6 11.Nge2 a6 12.Ba4 e5 13.0–0 Bd6 14.Rfe1 Rd8–/+; D) 9.Nf3 e5 (9...e6 10.Bc4 Qb4 11.Bb3 Bd6 12.Qe2 Bd7 13.Ne5 0–0 14.Nc4 Qc5–/+; 9...Bf5 10.Nb5 a6 11.Bc3 Qb6 12.Nbd4 Ne4 13.Rb1 Nc3 14.dc3 Qa5–/+; 9...Bd7 10.Bc4 e6 11.Qe2 Nc6 12.0–0 Rd8 13.Rab1 Be7 14.Ne4 Ne4=) 10.Bc4 Qb4 11.Bb3 Bd6 12.0–0 0–0 13.Re1 Nc6 14.Rb1 Qa5–/+.

8.Qc1 a6 9.Rb1 Nc6 (9...Nf6 10.Nf3 Nc6 11.Bd3 e5 12.Bf8 Rf8 13.0–0 b6 14.Qe1 h6+=; 9...e5 10.Bf8 Kf8 11.Be2 Nf6 12.Bf3 Ra7 13.Nge2 b6 14.0–0 Be6+=; 9...Nd7 10.Nf3 Ngf6 11.Bb4 Qf5 12.d4 e5 13.Bf8 Kf8 14.Qa3 Kg8+=) 10.Nf3 Nf6 11.Bd3 b5 12.Qb2 Rb8 13.Ne4 b4 14.Nf6 ef6–/+.

8.Qc1 a6 9.Qb2 Nd7 (9...Nc6 10.Nf3 Nf6 11.Rb1 e5 12.Bf8 Rf8 13.Bd3 Nd4 14.Nd4 ed4–/+; 9...Nf6 10.Nf3 Nc6 11.Rb1 e5 12.Bf8 Rf8 13.Bd3 Nd4 14.Nd4 ed4–/+; 9...b5 10.Be2 Nc6 11.Bf3 Bb7 12.Nge2 Nf6 13.0–0 Rb8 14.Rab1 e5+=) 10.Nf3 Ngf6 11.Bd3 b5 12.Be4 Ne4 13.Ne4 Bb7 14.Bb4 Qb6–/+.

8.Qc1 a6 9.Be2 Nf6 (9...Nc6 10.Nf3 Nf6 11.0–0 e5 12.Bf8 Rf8 13.Re1 Kd8 14.Bc4 Qc5–/+; 9...Qg5 10.Bf3 Nf6 11.Rb1 e5 12.Bf8 Rf8 13.h4 Qg6 14.h5 Qg5=; 9...Nd7 10.Nf3 Ngf6 11.0–0 e5 12.Bf8 Nf8 13.Qe1 N8d7 14.d4 0–0–/+) 10.Nf3 e5 11.Bf8 Rf8 12.0–0 e4 13.Nd4 Qe5 14.Nb3 Nc6–/+.

8.Qc1 a6 9.Nf3 b5 (9...Nc6 10.Be2 Nf6 11.0–0 b5 12.Bb2 e5 13.Re1 Rb8 14.Bd3 b4+=; 9...Nf6 10.Rb1 Nc6 11.Bd3 e5 12.Bf8 Rf8 13.Qb2 Nd4 14.Nd4 ed4–/+; 9...Nd7 10.Rb1 Ngf6 11.Bb4 Qf5 12.d4 e5 13.Bd3 Qg4 14.Bf8 Kf8+=) 10.Bb2 Nf6 11.Be2 Nbd7 12.Nd1 e6 13.Ne3 Qa4 14.0–0 Bd6–/+.

8.Qc1 Nc6 9.Rb1 a6 (9...Nd4 10.Nb5 e5 11.Bf8 Kf8 12.Nd4 ed4 13.Nf3 Qa2 14.Nd4 Qd5–/+; 9...Qe5 10.Nge2 a6 11.Bb2 Nf6 12.Qd1 Qd6 13.Ng3 e5 14.Bc4 Be7–/+; 9...Qf5 10.Bd3 Qg5 11.Be4 Nf6 12.Bc6 bc6 13.g3 Bg4 14.f3 Qe5+=) 10.Nf3 Nf6 11.Bd3 b5 12.Qb2 Rb8 13.Ne4 b4 14.Nf6 ef6–/+.

8.Qc1 Nc6 9.Bb2 Nf6 (9...e5 10.Bb5 Nge7 11.Nf3 a6 12.Bc4 b5 13.Bb3 f6 14.Qd1 Bg4–/+; 9...Bd7 10.Nf3 Nf6 11.Nb5 0–0–0 12.Ng5 Be8 13.Bc3 Qa4 14.Rb1 a6–/+) 10.Bb5 Bd7 11.Nf3 e5 12.0–0 Bd6 13.Re1 0–0 14.Bd3 Rae8–/+.

8.Qc1 Nc6 9.Bb5 Bd7 (9...Nf6 10.Bc6 bc6 11.Nge2 Rb8 12.0–0 Qg5 13.Rb1 Rb1 14.Qb1 Qd2=; 9...Rb8 10.Nf3 Bd7 11.0–0 a6 12.Be2 Nf6 13.Rd1 b5 14.Bb2 b4–/+) 10.Nf3 Nf6 11.Rb1 a6 12.Be2 b5 13.Qb2 Rb8 14.Bc5 b4–/+.

8.Qc1 Nc6 9.Nf3 a6 (9...Nf6 10.Rb1 a6 11.Bd3 e5 12.Bf8 Rf8 13.Qb2 Nd4 14.Nd4 ed4–/+; 9...Nb4 10.Nb5 Nd5 11.Rb1 a6 12.Nbd4 Qa4 13.c4 Nf4 14.Rb3 Nf6–/+; 9...Qf5 10.Bb5 Bd7 11.0–0 Nf6 12.Rb1 b6 13.Re1 a6 14.Bd3 Qa5+=) 10.Be2 Nf6 11.0–0 e5 12.Bf8 Rf8 13.Re1 Kd8 14.Bc4 Qc5–/+.

8.Qc1 Nd7 9.Rb1 c6 (9...Ngf6 10.Nf3 c6 11.Bb4 Qd8 12.Bd3 c5 13.Ba3 b6 14.0–0 Bb7–/+; 9...Qf5 10.Nf3 Ngf6 11.Bd3 Qg4 12.0–0 e5 13.Bf8 Rf8 14.Re1 Qe6=; 9...Qe5 10.Be2 Ngf6 11.Nf3 Qf5 12.d4 a6 13.0–0 b5 14.Nh4 Qe6=) 10.Nf3 Ngf6 11.Bb4 Qd8 12.Bd3 a5 13.Ba3 b5 14.Bb2 Nc5–/+.

8.Qc1 Nd7 9.Qb2 Ngf6 (9...c6 10.Nf3 Ngf6 11.Bd3 Nc5 12.Bc5 Qc5 13.Ne4 Qb6 14.Qe5 Ng4–/+; 9...a6 10.Nf3 Ngf6 11.Bd3 b6 12.0–0 c5 13.Ne4 Bb7 14.Rae1 e6–/+; 9...e5 10.Bf8 Kf8 11.Nf3 Ngf6 12.Bb5 c6 13.Bd3 Nb6 14.h3 Be6+=) 10.Nf3 e5 11.Bf8 Rf8 12.Bd3 Qb6 13.Qa3 Qd6 14.Qb2 e4–+.

8.Qc1 Nd7 9.Nf3 c6 (9...a6 10.Rb1 Ngf6 11.Bb4 Qf5 12.d4 e5 13.Bf8 Kf8 14.Qa3 Kg8+=; 9...e5 10.Bf8 Nf8 11.Rb1 a6 12.Bc4 Nd7 13.Qb2 Nh6 14.0–0 0–0+=; 9...Ngf6 10.Rb1 a6 11.Bb4 Qf5 12.d4 e5 13.Bd3 Qg4 14.Bf8 Kf8+=) 10.Rb1 Ngf6 11.Be2 e5 12.Bf8 Nf8 13.0–0 Ne6 14.Bd3 0–0+=.

8.Qc1 Bf5 9.Nf3 Nc6 (9...e5 10.Bf8 Kf8=) 10.Bb5 (10.Rb1!? a6 11.Rb7+=) 10...Bd7 11.0–0 a6 12.Bc6 Bc6 13.Nd4 Bd7 14.Nb3 (14.Qb2!?+=) 14...Qh5 15.Re1 Nf6 16.f3 b6 17.Ne2 Bc6 (17...Qg5 18.Nc3+=) 18.Nbd4 Bb7 19.Ng3 Qd5 20.Ndf5 e7 becomes the focus of attention (20.Qb2 e6 21.Bf8 Kf8+=) 20...e6+= 21.Bf8 Kf8 (worse is 21...Rf8 22.c4 Qd8 23.Ng7 Kd7 24.d4+=) 22.c4 (22.Ne3 Qd6+=) 22...Qd7 (22...Qa5 23.Ne3–/+) 23.Ne3 (23.Qa3 c5 24.Ne3 h5–/+) 23...Rd8 (23...h5 24.Qa3 Qe7 25.Qe7 Ke7 26.h4–/+) 24.Rd1 (24.d4!?–/+) 24...h5 25.Qc2? (better is 25.d3–/+) 25...h4–+ 26.Ngf1 h3 27.d4 hg2 28.Kg2 (28.Qg2 Rh6–+) 28...Nh5 29.Rd2 (29.d5–+) 29...Nf4 30.Kg3 (30.Kg1 Bf3 31.Kf2 Bb7–+) 30...Rh3 31.Kf4 (31.Kf2 Rf3 32.Ke1–+) 31...Rf3 (31...e5 32.de5 g5 33.Kg5 Qe7 34.Kf5 Rh5 35.Kg4 Qg5) 32.Kg5 f6 33.Kg4 (33.Kh4 g5 34.Kh5 Qf7 35.Qg6 Rh3 36.Kg4 Qg6 37.Kh3 Qh5 38.Kg3 Qh4) 33...f5 34.Kh5 (34.Nf5 ef5 35.Kh4 Qe7 36.Kh5 Rh3 37.Kg6 Qf6) 34...Qf7 35.Kg5 Qf6 36.Kh5 Rh3 0–1. Caceres,Elton Carlos (1855) – Deus Filho,Joaquim De (1980), Foz do Iguacu BRA, 2nd Open, 2014.

8.Qc1 Nf6 9.Rb1 a6 (9...c6 10.Nf3 Nbd7 11.Bb4 Qd8 12.Bd3 c5 13.Ba3 b6 14.0–0 Bb7–/+; 9...Qf5 10.Nf3 e5 11.Bf8 Rf8 12.Bd3 Qg4 13.0–0 Nbd7 14.Re1 Qe6=; 9...Qe5 10.Be2 Qg5 11.Bf3 c6 12.d4 Qf5 13.Nge2 Nbd7 14.0–0 h6+=) 10.Nf3 Nc6 11.Bd3 e5 12.Bf8 Rf8 13.Qb2 Nd4 14.Nd4 ed4–/+.

8.Qc1 Nf6 9.Bc4 Qg5 (9...c6 10.Rb1 e5 11.Bf8 Rf8 12.Bb3 b5 13.a3 Bg4 14.Qb2 Nbd7–/+; 9...Nbd7 10.Rb1 Qg5 11.Bf1 e5 12.Bf8 Nf8 13.Nf3 Qf4 14.Ne2 Qf5–/+; 9...Nc6 10.Nf3 Bg4 11.Be2 e5 12.Bf8 Kf8 13.Rb1 Nd4 14.Rb7 Ne2+=) 10.Bf1 Qg6 11.Nf3 Nc6 12.d4 Bg4 13.Ne5 Ne5 14.de5 Ne4–/+.

8.Qc1 Nf6 9.Be2 Nc6 (9...Qg5 10.Bf3 Nc6 11.Bc6 bc6 12.g3 Be6 13.d3 Qa5 14.Nge2 Bd5–/+; 9...Nbd7 10.Nf3 e5 11.Bf8 Nf8 12.0–0 Ne6 13.Bd3 0–0 14.Re1 Nd7–/+; 9...e5 10.Bf8 Rf8 11.Rb1 c6 12.Nf3 e4 13.Nd4 Qc5 14.Nb3 Qg5–/+) 10.Nf3 e5 11.Bf8 Rf8 12.Bb5 Bd7 13.0–0 a6 14.Bd3 Bg4–/+.

8.Qc1 Nf6 9.Nf3 a6 (9...Nc6 10.Rb1 a6 11.Bd3 b5 12.Qb2 Rb8 13.Ne4 b4 14.Nf6 ef6–/+; 9...e5 10.Bf8 Rf8 11.Rb1 a6 12.Bd3 b6 13.0–0 Nc6 14.Qe1 h6+=; 9...c6 10.Be2 e5 11.Bf8 Rf8 12.0–0 e4 13.Nd4 Qe5 14.Nb3 Be6–/+) 10.Rb1 Nc6 11.Bd3 b5 12.Qb2 Rb8 13.Ne4 b4 14.Nf6 ef6–/+.

8.Qc1 g6 9.Rb1 (9.Bc4 Bg7 (9...Nf6 10.Nge2 Nc6 11.Rb1 a6 12.Bb2 Ne5 13.Bb3 Bg7 14.f4 Ned7+=; 9...c6 10.Bb2 e5 11.Nf3 f6 12.0–0 Bg4 13.Ne1 Na6 14.h3 Bf5–/+; 9...Nc6 10.Rb1 Qg5 11.Nd5 Rb8 12.d3 Qg2 13.Nc7 Kd8 14.Bd5 Qg4=) 10.Bb2 Nf6 11.Nge2 0–0 12.0–0 Nbd7 13.Bb3 Rd8 14.Re1 Nb6–/+; 9.Nge2 Nd7 (9...Bg7 10.Rb1 a6 11.g3 Nf6 12.Bg2 c6 13.0–0 Qc7 14.Re1 0–0+=; 9...Nc6 10.Rb1 Bg7 11.Rb5 Qa6 12.Rc5 b5 13.Nf4 Bd7 14.Nfd5 Rc8+=; 9...Nf6 10.Rb1 Qf5 11.Ng3 Qd7 12.Bc4 Bg7 13.0–0 0–0 14.Re1 Re8+=) 10.Rb1 Bg7 11.Rb5 Qa6 12.d4 c6 13.Rb3 b5 14.Bb4 Ndf6+=; 9.Bb2 Nf6 (9...Bg7 10.Bc4 Nf6 11.Nge2 0–0 12.0–0 Nbd7 13.Re1 Nb6 14.Bb3 Bg4–/+; 9...e5 10.Bc4 Nc6 11.Nf3 Bg4 12.Ng5 Nh6 13.Nd5 0–0–0 14.Ne3 Bb4=; 9...Nd7 10.Nf3 Ngf6 11.Bb5 c6 12.Be2 Bg7 13.0–0 0–0 14.d3 Rd8–/+) 10.Bc4 Bg7 11.Nd5 Be6 12.Bc3 Qc5 13.Nf6 ef6 14.Be6 fe6–/+) 9...c6 (9...Bg7 10.Rb5 Qa6 11.Re5 Qf6 12.Nf3 e6 13.Re3 Qd8 14.Bc4 Ne7+=; 9...a6 10.Bc4 Bg7 11.Nd5 Nc6 12.Ne2 e6 13.Bb2 Be5 14.Ne3 Nf6+=) 10.Nf3 Bg7 11.Bb4 Qc7 (11...Qd8 12.Be2 Nf6 13.0–0 b6 14.Re1 0–0+=) 12.a4 (12.Be2 Nf6 13.0–0 0–0 14.d4 Bf5–/+) 12...Nf6 13.Be2 (13.d4 b6 14.Qe3 Na6–/+) 13...0–0 (13...b6 14.0–0 0–0–/+) 14.0–0 (14.d4 Nd5–/+) 14...Re8 (14...b6–/+) 15.d4 Nh5 16.Ne4 Bf5 17.Ng3 Nf4 18.Bc4 Bg4 19.Ne5 Be5 20.de5 Qe5 21.Qd2 Qc7 22.Rfe1 Be6 23.Re4 Nd5 24.Ba3 Nf6 25.Re6 fe6 26.Be6 Kg7 27.Qg5 Nbd7 (27...Kh8 28.Re1 Nbd7 29.Bf7=) 28.Bb2 (better is 28.Nf5 Kh8 29.Ne7 Re7 30.Be7+/–) 28...Kh8–/+ 29.Re1 Nf8?? (better is 29...Rf8–/+) 30.Bf7+– h6 (30...Kg7 31.Be8 Re8 32.Nf5 Kf7 33.Nh6 Kg7 34.Re7 Qe7 35.Nf5 Kf7 36.Ne7 Nd5+–) 31.Qh4 (better is 31.Qh6 N8h7 32.Be8+–) 31...N8h7 32.Bf6 ef6? (32...Nf6 33.Qh6 Nh7 34.Be8 Re8 35.Qg6 Qd7+–) 33.Be8 Qa5 34.Re7 (34.Re7 Qd8 35.Qb4+–) 1–0. Krasinski,Rafal (1975) – Zak,Pawel (1745), Rubinstein Polanica Zdroj Poland, 2010.

8.Bc1 Nc6 A) 9.Rb1 a6 (9...Qe5 10.Nge2 Nd4 11.f4 Qe6 12.Ba3 g6 13.Bb2 Nf6 14.Ne4 Qe4–/+) 10.Bc4 Nf6 11.Nf3 b5 12.Bb3 b4 13.Ne2 Bg4 14.Neg1 e5–/+; B) 9.Nf3 e5 (9...Nf6 10.Bb5 Bd7 11.0–0 e6 12.Qe2 Bd6 13.Bb2 0–0 14.Rfe1 Rad8–/+; 9...a6 10.Bc4 Nf6 11.0–0 b5 12.Bd3 Bg4 13.Ne4 Nd7 14.Neg5 h6+=; 9...Nb4 10.Bc4 Bf5 11.Bb3 e6 12.Bb2 0–0–0 13.0–0 Nf6 14.d3 Nc6–/+) 10.Bc4 Bb4 11.Bb2 Nf6 12.a3 Bd6 13.0–0 0–0 14.Re1 Bg4–/+; C) 9.Bb2 Nf6 (9...e5 10.Nf3 Bd6 11.Nb5 Bf5 12.Qe2 f6 13.Nbd4 Bd7 14.Nc6 Bc6–/+; 9...Bd7 10.Nf3 Nf6 11.Bc4 e6 12.Qe2 Rd8 13.0–0 Be7 14.Rfe1 0–0–/+; 9...a6 10.Nf3 Nf6 11.Bc4 Qc5 12.Bd3 Nb4 13.Be2 Bf5 14.d3 0–0–0–/+) 10.Bb5 Bd7 11.Nf3 e5 12.Qe2 0–0–0 13.Qc4 Qb4 14.Qb4 Nb4–/+; D) 9.Bb5 Bd7 10.Nf3 Nf6 11.0–0 e6 12.Bb2 Bd6 13.Re1 0–0 14.Qe2 Rad8–/+.

8.Bc1 e5 A) 9.Bc4 Nf6 10.Nf3 Bb4 11.Bb2 0–0 12.Qe2 Bg4 13.h3 Bf3 14.Qf3 Nc6–/+; B) 9.Bb2 Nf6 (9...Be7 10.Nb5 Nd7 11.Nf3 a6 12.Ne5 ab5 13.Nd7 Bd7 14.Bg7 Bf6–/+; 9...Nd7 10.Nf3 Ngf6 11.Qe2 Bd6 12.Nb5 0–0 13.a3 Re8 14.Bc3 Qb6–/+; 9...Be6 10.Nf3 Be7 11.Qe2 f6 12.Qb5 Qb5 13.Bb5 Nd7 14.0–0 c6–/+) 10.Nf3 Nbd7 11.Qe2 Bd6 12.Nb5 0–0 13.a3 Re8 14.Bc3 Qb6–/+; C) 9.Nf3 Nf6 (9...Bb4 10.Bb2 Nf6 11.Bc4 0–0 12.Qe2 Bg4 13.h3 Bf3 14.Qf3 Nc6–/+; 9...Bg4 10.h3 Bf5 11.Rb1 Bb4 12.Nb5 Nc6 13.Ne5 Ne5 14.Rb4 Qb4+=; 9...Bf5 10.Rb1 Bb4 11.Nb5 Nc6 12.Ne5 Ne5 13.Rb4 Qb4 14.Nc7 Kd8+=) 10.Rb1 a6 11.Bc4 Bb4 12.Bb2 Nc6 13.0–0 0–0 14.Re1 Bf5–/+; D) 9.Rb1 c6 (9...Bb4 10.Ne4 Nc6 11.Bc4 f5 12.Ng5 Nf6 13.c3 Be7 14.Rb5 Qa6=; 9...a6 10.Qf3 Nc6 11.Bc4 Nf6 12.Nd5 Be7 13.Ne7 Ne7 14.Ba3 Nc6–/+) 10.Nf3 Nf6 11.Bc4 Bb4 12.Bb2 0–0 13.Qe2 Nbd7 14.0–0 Re8–/+.

8.Bc1 e6 A) 9.Bc4 Nf6 (9...Bb4 10.Bb2 Nf6 11.Nf3 0–0 12.a3 Bc5 13.0–0 c6 14.Bd3 Nbd7–/+; 9...Nc6 10.Nf3 Nf6 11.0–0 Bc5 12.Qe2 0–0 13.Bb2 Nd4 14.Nd4 Bd4–/+; 9...Nd7 10.Rb1 Qg5 11.Bf1 Ngf6 12.Nf3 Qg6 13.d4 Bd6 14.Ng5 Qf5+=) 10.Rb1 Bb4 11.Bb2 0–0 12.Nf3 a6 13.Qe2 b5 14.Bb3 Bb7–/+; B) 9.Rb1 c6 (9...a6 10.Nge2 Nf6 11.g3 Bc5 12.Bg2 c6 13.d4 Bb4 14.Bd2 0–0–/+; 9...Bb4 10.Nb5 Na6 11.a3 Bf8 12.Qh5 Nc5 13.Nf3 c6 14.Ne5 Nh6–/+; 9...Nf6 10.Rb5 Qa6 11.Nf3 Qd6 12.Rb3 Qd8 13.Be2 Be7 14.Ne5 0–0–/+) 10.Bb2 Nf6 11.Nf3 Bb4 12.Bc4 0–0 13.0–0 b5 14.Be2 Bd6–/+; C) 9.Qf3 Nc6 (9...Bd6 10.Rb1 c6 11.Qg4 Be5 12.Nge2 Nh6 13.Qc4 Nf5 14.d4 Bf6–/+; 9...Nd7 10.Rb1 a6 11.Bb2 Ngf6 12.Qg3 Nc5 13.Nf3 Nfe4 14.Ne4 Ne4–/+; 9...Nf6 10.Rb1 Bb4 11.Nge2 0–0 12.Rb3 a6 13.a3 Bd6 14.Bb2 Nc6–/+) 10.Bb5 Bd7 11.Bb2 a6 12.Ba4 Nf6 13.Rb1 Bd6 14.Nge2 0–0–/+; D) 9.Nf3 Nd7 (9...Nf6 10.Be2 e5 11.Rb1 a6 12.Bc4 Bb4 13.Bb2 Nc6 14.0–0 0–0–/+; 9...Bb4 10.Ne4 f5 11.Neg5 h6 12.Nh3 Nf6 13.Nf4 0–0 14.Bc4 Nd5–/+) 10.Rb1 a6 11.Bb2 Ngf6 12.Bd3 Bb4 13.Ne4 Be7 14.Nc3 b5–/+.

8.Bc1 Nf6 A) 9.Rb1 a6 (9...c6 10.Bc4 e6 11.Nf3 Bd6 12.Bb2 b5 13.Bb3 b4 14.Ne2 Nbd7–/+; 9...Nbd7 10.Rb5 Qa6 11.Nf3 Qd6 12.Qe2 e6 13.Rb1 a6 14.d4 Qc6–/+) 10.Nf3 e5 11.Bc4 Bb4 12.Bb2 Nc6 13.0–0 0–0 14.Re1 Bf5–/+; B) 9.Bc4 e5 (9...e6 10.Rb1 Bb4 11.Bb2 0–0 12.Nf3 Nd5 13.Ne4 b5 14.Bb3 Bb7–/+; 9...a6 10.Nf3 e6 11.Bb2 Bd6 12.Bd3 0–0 13.Qe2 Rd8 14.0–0 Qh5–/+) 10.Nf3 Bb4 11.Bb2 0–0 12.Qe2 Bg4 13.h3 Bf3 14.Qf3 Nc6–/+; C) 9.Bb2 Nc6 (9...e5 10.Nf3 Be7 11.Qe2 Nc6 12.Qb5 Qb5 13.Bb5 Bd6 14.d4 ed4+=; 9...Nbd7 10.Bc4 e5 11.Nf3 Qb4 12.Bb3 Bd6 13.0–0 0–0 14.Re1 Qf4–/+; 9...e6 10.Bc4 Qb4 11.Bb3 Bc5 12.a3 Qh4 13.Qe2 0–0 14.Nb5 Ne4–/+) 10.Bb5 Bd7 11.Nf3 e5 12.Qe2 0–0–0 13.Qc4 Qb4 14.Qb4 Nb4–/+; D) 9.Nf3 e6 (9...e5 10.Rb1 a6 11.Bc4 Bb4 12.Bb2 0–0 13.Qe2 Nc6 14.Ne4 Nd7–/+; 9...a6 10.Bc4 e6 11.Bb2 Bd6 12.Bd3 0–0 13.Qe2 Nc6 14.Ne4 Ne4–/+; 9...c6 10.Bc4 e6 11.Bb2 Bc5 12.0–0 0–0 13.Qe2 b5 14.Bd3 Nbd7+=) 10.Be2 e5 11.Rb1 a6 12.Bc4 Bb4 13.Bb2 0–0 14.Qe2 Nc6–/+.

4.Qc1 Qb5

5.a4 Qb4 6.Bc3 Qd6 7.e3 h6 8.Nf3 Nf6 9.Be2 Nc6 10.0–0 g5 11.Ne1 (11.Bb5 Kd8=+) 11...h5 12.d3 g4 13.f4 Bg7 14.Nd2 Rg8 (14...Qc5 15.Nb1 d4–+) 15.g3 (15.Nb3 Bf5–/+) 15...e5 (better 15...h4!? 16.Qb2 Rh8–+) 16.Ng2 e4 (16...ef4 17.Nf4 h4 18.Qa3–/+) 17.de4=+ Ne4 18.Bg7 Rg7 19.Nb3 (19.Ne4 de4 20.Rb1 b6=+) 19...Rh7 (19...Qf6 20.c4 Nc3 21.Qe1–/+) 20.c4–/+ Be6 21.Qc2 (21.f5 Bd7 22.Nd2 0–0–0–/+) 21...Nb4 22.Qb2 (22.Qb1 0–0–0–/+) 22...0–0–0 (22...dc4!? 23.Nd4 c3–+) 23.Rad1 c6 (23...f5 24.Nd2–/+) 24.cd5 (24.f5 h4 25.gh4 Bd7=) 24...Bd5–/+ 25.Nd4 (25.Nd2 Qe7–/+) 25...a5 (25...f6 26.Nf5 Qf8 27.Ngh4–/+) 26.Rc1 Kb8 27.Bc4 (better 27.Rfd1–/+) 27...Nd3?? (better 27...Bc4 28.Rc4 Qd5–/+) 28.Bd3+– f5 (28...Rhh8 29.Rb1 Qc7 30.Rfc1+–) 29.Nf5 Qb4 30.Qb4 (30.Qe5!? Ka7 31.Nd4 Re7 32.Qh5 Nd2+–) 30...ab4 31.Nd4 Nd2 (31...Re7 32.Be4 Be4 33.Nh4+–) 32.Rf2 (better 32.Bh7 Nf1 33.Kf1 Bf7+–) 32...Bg2 (32...Ne4 33.Rb2+–) 33.Rg2 (better 33.Bh7 Nf1 34.Rg2 Ne3 35.Rd2+–) 33...Nf3 34.Nf3 gf3 (34...Rd3 35.Ne5 Re3+–) 35.Rf2 (better 35.Bh7 fg2 36.Bg6+–) 35...Rd3+= 36.Rf3 b3 (36...Re7 37.Re1+=) 37.Rb1 (37.f5!?+–) 37...c5+= 38.Rf2 (better 38.Rc1!?+=) 38...c4=+ 39.Kg2 (better 39.Rff1 Re3 40.Kf2=+) 39...Rhd7 (39...Re3 40.a5–/+) 40.Kf3 (40.e4 Rd2 41.e5 Rf2 42.Kf2 Rc7–+) 40...Rd2 (40...Re7 41.f5 Rde3 42.Kf4–/+) 41.Rff1 (41.Rd2 Rd2 42.Ke4–+) 41...c3?? (better 41...b2 42.f5 c3–+ (42...Rh2?! 43.g4–/+)) 42.h4?? (better 42.Rb3 c2 43.Rc1 Rh2 44.Rb2+–) 42...c2–+ 43.Rb3 Rd1 44.Ke2 (44.Rc3 Rf1 45.Ke2 c1R 46.Rc1 Rc1–+) 44...Rf1 (44...c1Q 45.Rd3 R7d3 46.Kf3 Qe3 47.Kg2 Qg3 48.Kh1 Rf1) 45.Kf1 (45.Rc3 c1R 46.Rc1 Rc1 47.Kf3–+) 45...c1Q 46.Ke2 (46.Kf2 Rd2 47.Kf3 Qh1) 46...Rd2 47.Kf3 Qd1 (47...Qh1) 48.Ke4 (48.Ke4 Qb3 49.Ke5 Qc3 50.Ke4 Qc6 51.Kf5 Rd5 52.Ke4 Rd6 53.Ke5 Qd5). Akrapovik – WWWOWA (1635), lichess.org, 2019.

5.a4 Qd7 6.Ra3 e5! 7.Rg3 Nf6 (< 7...Qa4 8.Be5 Nf6 9.Nc3=+) 8.Be5 Bd6 (8...Ne4!? 9.Rd3 Nc6–/+) 9.Qb2 Ne4 10.Rg7 Nc6 11.Bd6 Qd6 12.Rf7 Kf7 13.Qh8 Qb4 14.Qh7 Ke8 15.Qh5 Ke7 16.Qh4 Kd6 17.Qf4 Ne5?? 18.Nc3! Nc3 19.Qb4 (19.Qb4 c5 20.Qc3+–) 1–0. xtom – narokhammer (1695), kurnik, 2011.

5.a4 Qd7 6.e3 Qd8 7.Nc3 Nc6 8.Nb5 Nf6 9.c4 e6 10.cd5 ed5 (10...Qd5?? 11.Nc7 Kd8 12.Nd5 Nd5 13.Nf3+–; 10...Nd5?! 11.Nf3–/+) 11.Nf3 Be7 12.Be2 (better is 12.Be5!? Bd6 13.Nd6 cd6 14.Bc3=) 12...a6–/+ 13.Nbd4 Bd7 14.0–0 Nd4 15.Nd4 0–0 16.Qc3 Ne4 17.Qd3 Bf6 18.f3 Nd6 19.Rab1 (19.Qb3!?–/+) 19...c5 20.Nc2 Bc6 21.Bf6 Qf6 22.e4 Qe5 23.Qb3 de4 24.f4 Qd5 25.Qe3? Nf5 26.Qc3 Nd4 27.Bc4 Qh5 28.Nd4 cd4 29.Qd4 Rad8 30.Qe5 Qe5 31.fe5 Rd2 32.e6 Rg2 33.Kg2+– e3 34.Kg1 (34.Kg1 b5 35.ab5 ab5 36.Bb3+–) 1–0. dtpwaldi – smoothchess, kurnik, 2011.

5.Nc3 Qa5 6.Nf3 Nf6 (6...e5 7.e4 (7.Ne5? d4–+) 7...d4 8.Ne2–/+) 7.e3 Nbd7 8.d4 (8.Nd1 e6–/+) 8...Ne4 (9.Bd3 e5 10.Be4 de4–/+; 8...e5 9.Qd2 Qb6 10.Na4–/+) 0–1. Thud – Mandrake, Lento Atlantic Chess, 2003.

5.Nc3 Qd7 6.e3 c6 7.Nf3 Nf6 8.Rb1 Qc7 9.d4 Bf5 10.Bd3 Bg6 11.0–0 e6 12.Ne5 Nbd7 13.Ba3 (better is 13.Nd7!? Nd7 14.Ba3–/+) 13...Ne5–+ 14.de5 Nd7 (14...Qe5 15.Bf8 Rf8–+ (15...Kf8?! 16.Qa3 Kg8 17.Rb7=+; 15...Qc3?! 16.Bg7 Rg8 17.Rb3 Qb3 18.cb3 Rg7 19.Ba6+/–)) 15.Bf8–/+ Kf8 16.f4 Bd3 (16...Nc5 17.Qa3 Qe7 18.Rfd1=+) 17.cd3 g6 (better is 17...Qa5!?=+) 18.Nb5+= Qb8 (better is 18...Qa5!? 19.Nd6 Nb6+=) 19.Nd6+– Kg7?? (better is 19...b6 20.Qc6 Ke7+–) 20.Rb7 (20.Nb7?! Qc7+/–) 20...Qd8 21.Qc6 Nb6 22.Nf7 Qf8 23.Qe6 Qc5 24.Qf6 Kg8 25.Nh6# (25.Qh8#) 1–0. Djakov,Joao – Boysan,Ferit (2150), Internet Section, 2004.

5.Nc3 Qd7 6.Nf3 Nf6 7.Ne5 (7.e3 Nc6–/+) 7...Qd8 8.e3 c6 9.Be2 Bf5 10.g4 Be6 11.f4 g6 (11...Nbd7 12.Nd7 Bd7 13.g5–/+) 12.g5 Nfd7 13.Nd7 Qd7 (13...Nd7 14.h4–/+) 14.Na4 Rg8 15.Nc5 Qc8 16.Rb1 (16.Ne6 Qe6 17.Bd4 Nd7=+) 16...b6 17.Nd3 Nd7 18.Bf3 f6 19.h4 h5 20.Nb4 Bg4 21.Bg2 Nc5 (21...a5 22.Nd5 cd5 23.Bd5–/+) 22.d4 (better is 22.gf6!? Bf5 23.a3=+) 22...Ne4–/+ 23.Be4 (23.c4 e5 24.a3 ef4 25.ef4 Qe6 26.cd5 Bb4 27.ab4 cd5–/+) 23...de4–+ 24.d5 (24.a3 Bf3 25.Rh2 a5–+) 24...cd5 25.Nd5 (better is 25.Qd2 Qc4 26.gf6–+) 25...Qc4 26.Nc3 Rd8 (better is 26...fg5!? 27.Rh2 e5 28.Ba1 gf4 29.ef4–+) 27.Rh2 e5 28.Rd2 (28.Ne2 Qa2 29.gf6 ef4 30.ef4 Bf3–+) 28...Rg7 (better is 28...Bb4 29.Rd8 Kd8 30.Qd2 Kc8–+) 29.gf6?? (better is 29.Rd8 Kd8 30.gf6–+) 29...Rgd7 (better is 29...Rd2 30.Qd2 Rd7 31.f7 Kf7 32.Qg2–+) 30.Rd7 Rd7 (30...Bd7?! 31.Qd2 Bg4 32.f7 Qf7 33.Qg2–+) 31.Kf2 Rd1! 32.Qd1 (32.Nd1 Qe2) 32...Bd1 33.Rd1 ef4 (33...Bb4 34.fe5 Bc3 35.Bc3 Qc3 36.Rd4 Qc2 37.Kg3–+) 34.Rd4 fe3 35.Ke3 Bc5 (36.Ne4 Bd4 37.Bd4 Qc2–+) 0–1. Wall,Bill – Brown,Alan, Xenia, OH, 1983.

5.d3 Qb6 6.Nc3 Nf6 7.Nf3 Bg4 8.e3 e6 9.Be2 Be7 10.0–0 Nc6 11.Nd2 Be2 12.Ne2 0–0 13.Nd4 Bc5 14.N2b3 e5 (better is 14...Nd4 15.Nd4 e5–/+) 15.Nc6= Qc6 16.Nc5 Qc5 17.Be5 Rfe8 (17...Ng4!? 18.Bf4 b6=) 18.Bf6+/– gf6 19.c4 dc4 20.Qc4 Qc4 21.dc4 c5 22.Rfd1 Re7 23.Rd5 b6 24.Rad1 Kg7 25.Kf1 Rae8 26.Ke2 f5 27.Rf5 Re4 28.Rc1 R8e5 29.Re5 Re5 30.f3 Rg5 31.g4 h5 32.h3 f5 33.h4 Rg6 34.g5 (34.gf5?! Rg2 35.Kd3 Rh2+/–) 34...Rd6 (34...Re6+–) 35.Rd1 Rd1 36.Kd1 a6 37.a4 Kf7 38.Kd2 Ke6 39.Kd3 Kd6 40.Ke2 Kc6 (40...Ke7+–) 41.Kd3 (better is 41.g6 b5 42.ab5 ab5 43.Kd3+–) 41...Kd6 42.e4 fe4 43.Ke4 b5 (43...Ke6 44.f4 Kd6 45.f5+–) 44.ab5 ab5 45.cb5 Kc7 46.Kd5 Kb6 47.Kc4 1–0. Kardasz,Pawel – Ulandowski,Patryk, blind team ch Poland, 2008.

5.e3 Qb6 6.Nf3 Nf6 7.d3 g6 (7...Nbd7 8.Nbd2–/+) 8.Nc3 c6 9.Rb1 Bg7 10.Be2 0–0 11.0–0 Re8 12.Qd2 Bg4 13.Ba1 Qc7 14.Rfc1 Nbd7 15.Nd1 e5 16.h3 Bf3 (17.Bf3 Nc5–/+) 0–1. Cornacchini,Gabriele – Maltez,Nuno Manuel, IECC, 2000.

5.e3 Qb6 6.Nf3 Nf6 7.d4 (7.c4 Bf5=) 7...g6 8.Nbd2 Bg7 9.Bd3 Ng4 (better is 9...Nc6!?–/+) 10.c4 Nf2?? (better is 10...Na6 11.cd5 Nb4+=) 11.Kf2+– Be6 12.Rb1 c5 (12...Nd7 13.Ba3 Qc6 14.e4+–) 13.Ba1 (better is 13.dc5!? Bb2 14.Rb2 Qc7+–) 13...Qc7 14.cd5 Bd5 15.Qc5 Qc5 16.dc5 Ba1 17.Ra1 0–0 18.Nb3 Nd7 19.Rhd1 Nf6 20.Rac1 Ng4 21.Ke2 Rac8 22.h3 Nf6 23.Bc4 Rfd8 24.Bd5 Nd5 (24...Rd5 25.Rd5 Nd5 26.Ne5+–) 25.g3 f5 26.Na5 Rb8 (26...Rc7+–) 27.c6 b6 (27...bc6 28.Nc6 Rb2 29.Ke1 Re8 30.Rd5 Ra2+–) 28.Nb7 Nc3 (28...e6 29.c7 Rdc8 30.cb8R Rb8 31.Nd6+–) 29.Rc3 (29.Rc3 Rd1 30.Kd1+–) 1–0. Ladeira,Paulo – Foletta,Ian, IECC, 2013.

5.e3 Qc6 6.Nf3 Qg6 (6...Nd7 7.Na3=+) 7.Nc3 (7.c4 Nf6=) 7...c6 8.Ne2 Qd6 9.Ng3 Bg4 10.Nd4 (better 10.Ne5 Be6 11.Rb1=+) 10...g6?? (better 10...e5 11.Be2 Be2 12.Nde2 Nd7–/+) 11.Nb5+– Qc5?? (11...cb5 12.Bb5 Nc6 13.Bh8+–) 12.Bh8 (better 12.Bd4 Qd4 13.Nd4+–) 12...Qb5?? (better 12...cb5 13.Bd4 Qc6+–) 13.Bb5 (13.Bb5 cb5 14.Qb2+–) 1–0. Akrapovik (1605) – dragonl41 (1615), lichess.org, 2019.

5.e4 Qc5 6.ed5 Qd5 7.Nc3 Qh5 8.Nf3 Nc6 9.Be2 Bg4 10.0–0 0–0–0 11.Rb1 e5 12.Ne4 f5 13.Ng3 Qe8 14.h3 (14.Re1 Bd6=) 14...Bf3 (14...f4 15.Ne4 Bf5 16.Bd3=+) 15.Bf3= e4 16.Be2 (16.Bh5!? Qe6 17.Nf5=) 16...f4=+ 17.Nh5?? (better 17.Bg4 Kb8 18.Nh5=) 17...f3!–+ 18.Ng7 (18.gf3 Nd4 Double attack (18...Qh5 Decoy; 18...Qh5 Interception)) 18...Qg6 19.Bf3 ef3 (19...Bg7?! 20.Be4 Bb2 21.Qb2 Qe4 22.Qh8–/+) 20.g3 Bg7 21.Bg7 Qg7 22.Qa3 h5 (better 22...Rd2!? 23.Qf3 Nge7 24.Rfd1 Rd1 25.Rd1–+) 23.Qb3 b6 24.Qb5 (24.Qf3 Nge7 25.Qe3 Qf6–+) 24...Nge7 (24...Nd4 25.Qa6 Kb8 26.Rfe1 Ne2 27.Re2 fe2 28.Qe2–+) 25.Qa6 (25.Rfd1 Qh6–+) 25...Kb8 26.a4 (26.Rfd1 Nd4 27.Qc4 Ne2 28.Kh2 Qg4 29.Qe2 fe2 30.hg4 ed1R 31.Rd1 hg4 32.Kg2 Nc6–+) 26...Qe5 (26...Nf5 27.Qb5 Ng3 28.Kh2 Rd2 29.c3 Ne4 30.Qb6 cb6 31.Rb6 ab6 32.Rg1 Qe5 33.Rg3 Qg3 34.Kh1 Nf2) 27.a5 (27.Rfe1 Qf5–+) 27...Qa5 (better 27...Rhg8 28.g4 hg4 29.Rfe1 gh3 30.Kh1–+) 28.Qa5 Na5 29.Ra1 (29.d3 Nec6–+) 29...Nac6 (29...Rd2 30.Rfe1 Nf5 31.Red1–+) 30.Rfb1 (30.Rfd1 Nd4 31.Ra3 Rhf8–+) 30...Rd2 31.c4 Rc2 (31...Ne5 32.Ra3–+) 32.Ra4 (32.Rc1 Re2–+) 32...h4 33.c5 (33.g4–+) 33...hg3 34.cb6 (34.Raa1 Rh3 35.Rb6 cb6 36.Rf1 g2 37.cb6 Rh1) 34...cb6 (34...gf2 35.Kf1 Nf5 36.ba7 Ka8 37.Rb8 Rb8 38.ab8Q Kb8 39.Ra8 Ka8 40.h4 Ne3) 35.fg3–+ Rh3 36.Rg4 (36.Rh4 Rg2 37.Kf1 Nf5 38.Rh8 Rh8 39.Rb6 ab6 40.g4 Rh1) 36...f2 (36...Rg2 37.Kf1 Rh1) 37.Kg2 Rh8 (37...f1Q 38.Kf1 Rh1) 38.Rf1–+ Rd8 (better 38...Nf5 39.Re4 Rg8 40.g4 Rg4 41.Rg4 Ne3 42.Kf3 Nf1 43.Rg8 Kc7 44.Rf8–+) 39.Rf2 Rf2 40.Kf2 Rd2 (40...b5 41.Rg7–+) 41.Ke1 Rd4 42.Rg7 a5 43.g4 (43.Rg5 a4 44.Rb5 Kc7–+) 43...a4 44.Rh7 a3 45.Rh8 Kb7 46.g5 a2 47.Rh1 (47.Rh5 a1Q 48.Ke2 Qb2 49.Ke1 Qc2 50.g6 Rd1) 47...a1Q 48.Ke2 Qh1 49.Ke3 (49.Kf2 Qh2 50.Ke1 Qc2 51.g6 Rd1) 49...Qe4 (49...Qf1 50.g6 Nd5) 50.Kf2 Nb4 (50...Rd2 51.Kg3 Nf5 52.Kh3 Qf3) 51.Kg3 Rd3 (51...Qe3 52.Kg2 Rd2 53.Kf1 Qf2) 52.Kf2 Nf5 53.Kg1 (53.g6 Rd2 54.Kf1 Qb1) 53...Qe2 54.g6 Rd1 0–1. bazilishek (1685) – Ive_things_to_do_but (1715), lichess.org, 2020.

5.Nf3 Qa5 6.e3 (6.Bc3 Qa4=) 6...Nc6=+ 7.c4 Bg4 (better is 7...Nf6!?=+) 8.Bc3+= Qc5 9.d4 Qd6 10.Nbd2 Nf6 (10...0–0–0 11.Bd3+=) 11.Rb1 Rb8 12.Ne5 Bf5 13.Rb3 Nd7 (13...a6 14.Qb2 Bc8 15.Be2+/–) 14.Nd7+/– Qd7 (14...Kd7?? 15.cd5 Nd8 16.e4+–) 15.cd5 Qd5 16.f3 Bd7 17.Qb2 Nd8 18.Bc4 (18.Bb5 Bb5 19.Rb5 Qd7+=) 18...Qg5 19.0–0 Qe3 20.Kh1 Qh6 21.Ne4 b6 22.Bd2 Qh5 (22...Qg6 23.Rc1+/–) 23.Re3 (23.Re1 Nb7 24.Ng3 Qg6+/–) 23...Nb7 24.Rc1 Kd8 (24...e6 25.d5+–) 25.Ra3 a5 26.Ba6 f5 (better is 26...Qd5 27.Rac3 Qd4+–) 27.Bf4 (27.Bf4 Nd6 28.Nc5+–) 1–0. Broly – pierre, internet, 2009.

5.Nf3 Nf6 6.e3 Qd7 7.c4 =+.

5.e3 Qd7

6.a4 a5 7.Ba3 (7.Nf3 e6=+) 7...Nf6 (7...Qa4 8.Nf3–/+) 8.Nf3 (8.Bb2 Ne4–/+) 8...Nc6 (8...Qa4!? 9.c4 Qd7–/+) 9.Bb5=+ Qf5 (better is 9...Qg4!? 10.0–0 Bd7=+) 10.Nd4+= Qd7 11.Nc3 (better is 11.c4+=) 11...e5–/+ 12.Nf3 Qe6 13.Bf8 Rf8 14.Qb2 Bd7 15.Ng5? (better is 15.Bc6 bc6 16.Qb7=+) 15...Qg4–+ 16.Nd5 Nd5 17.Nh7 Rh8 18.Bc6 bc6 19.Qe5 Ne7 20.Ng5 f6 21.Qc7 Qg5 22.Rb1 Qg2 23.Rb8 Kf7 24.Rh8 Qh1 25.Ke2 Bg4 26.f3 Qf3 27.Ke1 Qe2# 0–1. popovicigelu – amadeuzz (1630), kurnik, 2011.

6.a4 Nf6 7.Bb5 c6 (7...Nc6 8.Nf3–/+) 8.Bd3 (8.Be2 Na6=+) 8...g6 (8...Qg4!? 9.Bf1 Na6–/+) 9.Nf3=+ Bg7 10.Ne5 (10.0–0 Na6=+) 10...Qd8 11.f4 0–0 12.0–0 Nbd7 13.Nc3? (better is 13.Nd7 Bd7 14.Be5–/+) 13...Ne5–+ 14.fe5 Ng4 15.Ne2 Ne5 16.Ba3? Nd3 17.cd3 Re8 18.Rb1 b6 19.Qe1? Ba6 20.Nc1 e5 21.Qf2 Qd7 22.Qh4 c5 23.a5 Rab8 24.ab6 ab6 25.Ra1 Bb5 26.Rb1 f5 27.Bb2 Bc6 28.Rf3 Qe7 29.Qf2 e4 30.Rh3 Bb2 31.Rb2 Qg7 32.de4 Qb2 33.ef5 Qc1 34.Qf1 Qf1 35.Kf1 Rf8 0–1. elektrooon – messerschmidt1 (1705), kurnik, 2012.

6.Nf3 Nc6 7.c4 e6 8.cd5 ed5 9.Be2 Nf6 10.0–0 Be7 11.Nc3 0–0 12.d4 a6 13.Rd1 Na5 14.Ne5 Qd8 15.Na4 c6 16.Nc5 Nd7 17.Ba3 Ne5 18.de5 Be6 19.f4 Qb6 20.Rb1 Qa7 21.Kh1 Bc5?? 22.Bc5+– b6? 23.Bf8 Rf8+/– 24.Qb2 b5 25.Rd3?? Nc4–/+ 26.Qc1 Bf5 27.Rc3 Bb1 28.Qb1 g6 29.a4 Rb8 30.a5 Na5–+ 31.Qb4 Nc4 32.Qd6?? Nd6 (32...Nd6 33.ed6 b4–+) 0–1. nizinna – messerschmidt1 (1810), kurnik, 2011.

6.Nf3 Nc6 7.c4 Nf6 8.cd5 Qd5 9.Nc3 =.

6.Nf3 e6 7.c4 +=.

6.Nf3 f6 7.Nc3 e5 8.Be2 a6 9.0–0 Bd6 (9...Nc6 10.d4 e4 11.Nd2=) 10.d4 (better is 10.Nd5!? Ne7 11.e4+=) 10...e4= 11.Nd2 Ne7 12.Nd1 0–0 13.c4 c6 14.Nc3 Qc7 (14...b5 15.c5 Bc7 16.f3 ef3 17.Bf3–/+) 15.h3 Ng6 (better is 15...b5 16.c5 Bh2 17.Kh1 Nd7=) 16.cd5+/– f5 17.Bc4 (17.Qd1 Nd7+/–) 17...Kh8 (17...b5 18.Bb3 Kh8 19.f3 ef3 20.Nf3+=) 18.dc6 (18.a4 Nd7+/–) 18...bc6 (18...Nc6 19.Ba3+=) 19.f4 (19.Ba3!?+/–) 19...ef3+= 20.Nf3 (20.gf3 Qe7 21.Rf2 Qg5 22.Kf1 Qe3–+) 20...f4? (20...Nd7 21.Ba3+=) 21.e4 Qe7 22.e5+– Bb4 23.Ne4 Nh4? 24.a3+– Ba5 25.Nd6 Nf3 26.Rf3 Qg5 27.Nf7 Rf7 28.Bf7 c5 29.Qf4 Qf4 30.Rf4 Bd2 31.Bd5 Bf4 32.Ba8 Be3 33.Kh2 cd4 34.Rd1 Nd7 35.Bd4 Bf4 36.g3 (36.g3 Bg5 37.h4+–) 1–0. lllllll21 – messerschmidt1 (1700), kurnik, 2011.

6.Nf3 f6 7.d4 e6 8.Be2 Bd6 9.0–0 Ne7 10.c4 c6 (10...dc4 11.Bc4 b5 12.Bd3=+) 11.Nc3 (11.c5 Bc7=+) 11...g5 (11...0–0 12.c5 Bc7 13.e4=+) 12.cd5 (12.Ba3 Bc7=) 12...ed5 (12...Nd5 13.Ne4=+) 13.e4 (13.Ba3 Ba3 14.Qa3 g4=) 13...Bf4 (13...g4 14.Nd2=+) 14.Qd1 h5 (14...de4 15.Ne4 Nd5 16.Re1=+) 15.Bc1 Bc1 (15...Bd6=) 16.Qc1 (16.Rc1 de4 17.Ne4 Nd5=) 16...Ng6 (16...g4 17.Nd2–/+) 17.Ng5?? (better is 17.ed5 Nf4 18.Re1+=) 17...fg5–/+ 18.Qg5 Qh7 (18...Qd6 19.ed5 Ne7 20.Ne4=+) 19.ed5=+ Qh6 20.Qg3 (20.Qh6 Rh6 21.Rae1 Kd7=+) 20...Bf5 (20...Nf4 21.dc6 Nc6 22.Rad1–/+) 21.Bd3 Bd3–/+ 22.Qd3 0–0 23.g3 Qg5 24.Kh1 cd5 25.f4 Qf5 26.Qf3 Nc6–+ 27.Rad1 Rad8 28.a3 Rfe8 29.Qd3 Qd3 30.Rd3 Nf8 31.g4 hg4 32.Rg1 Re7 (33.Rg4 Kf7–+; 32...Ne6 33.f5 Ned4 34.Rd4 Nd4 35.Rg4 Kf7 36.Rd4 Re1 37.Kg2–+) 0–1. Rongen – Gouma, Helmond, 1994.

6.Nf3 f6 7.d4 Nh6 8.c4 c6 9.Bd3 e6 10.0–0 Bd6 11.Nbd2 0–0 12.Ba3 Ba3 13.Qa3 Nf7?? (better is 13...Rd8=) 14.Bh7!+– Kh7 15.Qf8 Na6 16.cd5 cd5 17.Qa3 b6 18.Qd3 Kg8 19.Rfc1 Bb7 20.Rab1 Qd6 21.Qg6 Nc7 22.Rc3 Ne8 23.Rbc1 Qd7 24.Ne1 Nfd6 25.Nd3 Nb5 26.R3c2 Ned6? 27.a4 1–0. Okeefe,Michael (2190) – Evans,Stanley, VD–2010–0–00003, 2010.

6.Nf3 Nf6 7.Be2 (7.Nc3 Nc6–/+) 7...Qg4 (7...Nc6 8.0–0+=) 8.0–0 c6 (8...Nbd7 9.Nc3+=) 9.Qd1 Qb4 (9...Nbd7 10.Nd4 Qh4 11.Nf3+=) 10.Qc1 (10.Bc3 Qb6+=) 10...Bf5 (10...Bg4 11.Bd4+=) 11.d3 (11.Bd4 e6+=) 11...Nbd7 12.Nbd2 (12.Bc3 Qd6+=) 12...Qd6 13.Rb1 (13.c4 e5+=) 13...e5–/+ 14.e4 de4 15.de4 (15.Nc4 Qe6 16.Ng5 Qe7+=) 15...Ne4 16.Ne4 (16.Nc4!? Qe6 17.Nce5 Ne5 18.Ne5+=) 16...Be4–/+ 17.Rd1 (17.Qe3 Bf3 18.Bf3 Qc5–/+) 17...Qc7 18.Qd2 (18.Ng5 Bg6–+) 18...Bc5 (18...f6 19.Qc3–+) 19.Bc3 (19.Qc3 b6–+) 19...0–0–0 (19...Bd5 20.a4–+) 20.Qc1 (20.Ba5 b6 21.Qc3 Rhe8–+) 20...f6 (better is 20...Rhe8–+) 21.Qb2 (better is 21.Nd2 Bd5 22.Nb3–+) 21...Qb6 22.Ba5 (22.Kf1–+) 22...Bf2 23.Kh1 (23.Kf1 Qb2 24.Rb2 Bb6 25.Bb6 Nb6 26.Rd8 Rd8–+) 23...Qb2 24.Rb2 Nb6 (24...Bb6 25.Bb6 Nb6 26.Re1–+) 25.Rdb1 (25.Rd8 Rd8 26.Nd2 Bf5–+) 25...Be3 (25...Bc5 26.Bb6 Bb6 27.Bc4–+) 26.Bb6 (26.Re1 Rd5 27.Bb6 Bb6–+ (27...ab6?! 28.Bc4 Bf2 29.Bd5 Bd5 30.Rd1–+)) 26...Bb6 27.Nd2 (27.Bc4–+) 27...Rd2 28.Bg4 Kb8 (28...Kc7 29.Bf3 Rhd8 30.a4 Bc2 31.a5 Ba5 32.Rb7 Kd6 33.Ra1–+) 29.Bf3 Bf3 (better is 29...Rhd8!? 30.h4 Bc2 31.Re1–+) 30.gf3 Rhd8 0–1. MTBrain – Wall,Bill, internet, 1998.

5.e4 Qd7

6.Nc3 d4 7.Nd5 (7.Nce2 e5–/+) 7...c6 (7...e6 8.Nf4 e5 9.Nd3–/+) 8.Nf4 e5 9.Nd3 Bd6 10.Ba3 (10.f4 f6–/+) 10...Nf6 11.h3? (better is 11.Nf3 c5 12.Nde5–/+) 11...Ne4–+ 12.Nf3 f6 13.Be2 0–0 14.0–0 c5 15.Nh4 Na6 16.Rb1 Qe7 17.Bg4? Bg4 18.hg4 g6 19.f3? Ng3 20.Re1 f5 21.gf5 Qh4 22.fg6 e4 23.gh7 Kh8 24.Nf2 ef3 25.Rb7 Ne2 26.Re2 fe2 27.Qe1 Qh2# 0–1. popovicigelu – amadeuzz (1745), kurnik, 2012.

6.Nc3 de4 7.f3 –+.

6.e5 c5 7.a4 (7.Nf3 Nc6–/+) 7...Nc6 8.Bb5 Qc7 (8...Qg4 9.Kf1–+) 9.d4 a6 10.Bc6 Qc6 11.Nf3 Bg4 12.Nfd2 e6 13.0–0 Nh6 14.f3 (14.a5 Rc8 15.Nb3 cd4 16.Nd4 Qc7–/+) 14...Bf5–+ 15.c3 Bb1 (15...Rc8 16.Nb3–+) 16.Rb1 (16.Qb1 Nf5 17.Qd3–/+) 16...c4 (better is 16...Qa4!? 17.c4 Rc8–+) 17.Ba3 Nf5 (17...Ba3 18.Qa3 b6 19.Rf2–/+) 18.Bf8=+ Kf8 19.Qa3 Kg8 20.Rb4 (20.a5 Rb8=) 20...g6 (better is 20...Ne3!? 21.Rc1 Rb8=+) 21.Rfb1= Rb8 22.a5 Kg7 23.Rb6 Qc7 24.g4 Ne7=+ 25.R1b2 Nc6 26.Nb1 Rhd8 27.Qc5 Qd7 28.Na3 Rdc8–+ 29.Qd6 Qd6 30.ed6 Na5 31.d7 Rd8 32.Rd6 Kf8 33.Rbb6? Ke7 34.Nc2 Nc6 35.Rdc6 bc6 36.Ra6 Rb1 37.Kg2 Rb2 38.Kg3 Rc2 39.Rc6 Rd7 40.h4 Rc3 41.Kf4 h6 42.g5 h5 43.Rc8 Ra7 44.Rb8 Rd3 45.Ke5 c3 46.f4 Re3# 0–1. dtpwaldi – hajdede (1820), kurnik, 2011.

6.ed5 Qd5

7.Nc3 Qa5 8.Bc4 Nf6 9.Nge2 c6 (9...e5 10.0–0–/+) 10.0–0+= b5 11.Bb3 e6 12.d3 Be7 13.Ng3 0–0 14.a4 (14.Nce4 Nbd7–/+) 14...b4 15.Nce2 (15.Nce4 Nbd7–/+) 15...Nbd7 16.Qe3 Nb6 17.Ne4 Nbd5 (better is 17...Ne4 18.de4 Ba6–/+) 18.Qg3+– Ne8 19.c4 (19.Rfe1 Bb7+=) 19...bc3!–/+ 20.N2c3 (20.Bc3 Nc3 Combination; 20.N2c3 Ba6 Decoy; 20.N4c3 Bd6 Combination) 20...Qc7 (20...f5 21.Nd5 cd5 22.Bc3–/+) 21.Nd5 cd5 22.Be5 Qa5 23.Nc3 f6 24.Bd4 Nd6 25.Ne2 (25.Qf3 Kh8–/+) 25...Nf5 26.Qf3 Rb8 27.Rfb1 (27.Bc3 Bb4 28.Qf4 Bc3 29.Qb8 Ba1 30.Ra1 Qd2–+) 27...Bd7 (27...Nd4 28.Nd4 Bd7 29.Rc1–+) 28.Bc3–/+ Qb6 (28...Bb4 29.Bb2–+) 29.g3 (29.d4 Qc7–/+) 29...Kh8 30.Nc1 (30.a5 Qd6–/+) 30...Rfc8–+ 31.Bb2? (31.a5 Qa6 32.d4 Bb4–+) 31...Qa5 (better is 31...Rc1!? 32.Bc1 Nd4 33.Qd1 Nb3 34.a5–+) 32.Qd1 e5 33.Ne2 d4 34.Rc1 Bb4 (34...Qb6 35.Rc8 Bc8 36.Rc1–+) 35.Rc8 Rc8 36.Rc1 Ne7 37.Rc8 (37.Rb1 Nd5–+) 37...Bc8 (37...Nc8 38.Qc2–+) 38.f4 (38.Bc1 Qb6 39.Kg2 Qc6 40.f3 Bb7–+) 38...Nd5 (38...Bg4 39.Bc4–+) 39.fe5 fe5 40.Qf1 Nf6 41.Bc1 (41.Qd1 Be1 42.Qc2 Bb7–+) 41...Bb7 Black prepares e4 (41...Qa6 42.Bg5–+) 42.g4 (42.Bg5 Qa6 43.Bf6 gf6–+) 42...Bd6 (42...Bd2 43.g5 Bc1 44.Qc1–+) 43.Ng3 (better is 43.g5 Nd7 44.Ng3–+) 43...e4 (43...Qb4 44.Bd1–+) 44.Ne4 (better is 44.g5 Ng4 45.Be6–/+) 44...Ne4–+ 45.de4 Qc3 (45...Qe5 46.Qe2–+) 46.Bd5 (46.Bf4 Bf4 (46...Qb3?! 47.Bd6 Qe3 48.Qf2+=; 46...Be4?! 47.Bd6 Qb3 48.Qf8 Qg8 49.Qe7=) 47.Qf4 Qe1 (47...Qb3 48.Qb8 Qg8 49.Qb7+/–) 48.Kg2 Be4 49.Kh3 Qe3 50.Qe3 de3–+) 46...Bd5 47.ed5 d3 (47...d3 48.Qd1 Qd4 49.Kg2 Bb4–/+) 0–1. Mueller,Klaus – Berg,Anderz, corr ICCF EU–M–GT–189, 1984.

7.Nc3 Qa5 8.Nf3 Nf6 9.Be2 e6 10.0–0 Be7 11.d3 0–0 12.Ne4 Nbd7 13.Bc3 Qd5 14.Nfd2 Ne4 15.Ne4 f5 16.Ng5 e5 17.Nf3 Bf6 18.Nd2 Kh8 19.Bf3 Qe6 20.Re1 c5 21.Qa3 a6 22.Rab1 Rb8 23.Ba1 b5 24.Nb3 Bb7 25.Bb7 Rb7 26.d4 c4 (better is 26...b4 27.Qa5 Qc6 28.Nc5 Rb5 29.Qa6 Rc5 30.Qc6 Rc6 31.de5 Be7–/+) 27.de5= Be7 (27...cb3?? 28.ef6 Rf6 29.Bf6 bc2 30.Rbc1 (30.Re6?? cb1Q 31.Qc1 Qc1 32.Re1 Qe1) 30...Qe1 31.Re1 Nf6 32.Qc5+–) 28.Nd4 Ba3 29.Ne6 Re8 30.Nd4 Re5 (30...Ne5? 31.Nf5 Rf7 32.Be5 (32.Re5?! Re5 33.Be5 Rf5=) 32...Rf5 33.Bg7 Kg7 34.Re8+–) 31.Re5 Ne5 32.Nf5 Nc6 33.Re1 Kg8 34.Re6 Rd7 35.Ne3 Nb4 36.Kf1? (better is 36.Bc3=) 36...Na2?? (better is 36...Bc1 37.a3 Kf7–+ (37...Ba3?! 38.Bc3+=)) 37.Ra6+/– b4 38.c3 Nc1 39.cb4 Bb4 40.Bb2 (40.Rc6 Nd3+/–) 40...Nb3 (40...Nd3 41.Nc4 Rc7 42.Ra8 Kf7 43.Rd8 Nf2 44.Ne5 Ke6 45.Nf3=) 41.Nc4 (41.Ra4!? Bc5 42.Nc4 Nd2 43.Ke2 Nc4 44.Rc4 Bf2 45.Bg7+=) 41...Nd2= 42.Nd2 Bd2 (better is 42...Rd2!? 43.Ra8 Kf7 44.Ra7 Ke6=) 43.g3 Bb4 44.Rc6 Kf7 45.Bc1 Bd2 46.Bb2 Bb4 47.Be5 Re7 48.Bd4 Rd7 49.Be5 Re7 50.Rc7 Rc7 51.Bc7 h5 52.Ke2 Ke6 53.Bd8 Bc5 54.Bg5 Kf5 55.Be3 Bd6 56.h3 g6 57.Kf3 g5 58.g4 hg4 59.hg4 Kg6 60.Ke4 Bc7 61.f3 Bb8 62.Bd4 Bf4 63.Be5 Bc1 64.Kd5 Bd2 65.Bd6 Bc3 66.Ke4 ½–½. Valenta,Vit (2190) – Kuchynka,Lukas (2200), CZE–chT2E, 2008.

7.Nc3 Qd8 8.Nf3 e6 9.Ne4 Nd7 10.Bc4 (10.Bb5 c6 11.Bd3 Ngf6+=) 10...Ngf6–/+ 11.Ng3 (11.Nf6 Nf6 12.0–0 Bd6–/+) 11...Be7 12.0–0 0–0 13.d4 b6 14.Qf4 Bb7 15.Ne5 Nd5 16.Qf3 Ne5 17.de5 Qc8 18.Nh5 Nf6 (18...Kh8 19.Rfd1+=) 19.Nf6+= Bf6 20.Qg4 Be7 21.f4 (21.Bc1 Kh8+=) 21...g6 (21...Be4 22.Bd3 Bd3 23.cd3–/+) 22.Rad1 Rd8 23.Rd8 Qd8 24.f5 ef5 (better is 24...h5 25.Qg3 Bh4+=) 25.Qg3 (better is 25.Rf5!? Bd5 26.Rf1 Bc4 27.Qc4 Bc5 28.Kh1–/+) 25...Bc5 26.Kh1 Bd5 27.Bd3 (27.Bb3 Be6–+) 27...Be6 28.Bf5?? (better is 28.a3–+) 28...Bf5 29.e6 f6 (worse is 29...fe6 30.Qe5 Qf8 31.Qh8 Kf7 32.Qh7 Ke8 33.Bg7–+; 29...Be6 30.Qe5 Kf8 31.Qh8 Ke7 32.Bf6 Kd7 33.Bd8+/–) 30.e7 (30.a3 Qd6 31.Qf3 Re8 32.Bf6 Qe6–+) 30...Be7 31.Rf5 0–1. Judas,Sven – Feibert,Fred, RLPF–ch Wittlich, 1985.

4.Bc3 Qb5

5.a4 Qd7–/+ 6.e3 Nc6 7.Nf3 f6 8.Bb2 (8.d4 e6=+) 8...e5–/+ 9.c4 Nce7 10.cd5 Nd5 11.Nc3 Nc3 12.Bc3 Bd6 13.Bc4 Ne7 14.0–0 Nc6 15.d4 e4 16.Nd2 f5 17.f3 ef3 18.Nf3 Qe7 19.d5 (19.Qd2 a6=+) 19...Ne5 (19...Qe3!? 20.Kh1 Qc3–/+) 20.Ne5=+ Be5 21.Bd4 Bd7 22.Rb1 b6 23.Qf3 Qd6 (23...Ba4? 24.d6! (24.Qf5?! Bd4 25.ed4 Bd7 26.Qh5 g6=) 24...Bh2 25.Kh2 Qd6 26.Kg1+–) 24.g3? (24.Be5 Qe5 25.a5 0–0=+) 24...0–0 (24...Bd4 25.ed4 0–0 26.a5–/+) 25.Bb5 (25.Be5 Qe5 26.a5 Rae8=+) 25...Bb5 (25...Bd4 26.ed4 Rad8 27.h3–/+) 26.ab5–/+ Rae8 27.Ra1 (27.Ra1 Bd4 28.ed4–/+). RichardSommer (2005) – DarwinBeltran2020 (1955), lichess.org, 2020.

5.a4 Qd7–/+ 6.g3 (6.e3 Nf6–/+) 6...c5 (6...d4 7.Bb4–/+) 7.Bg2 d4 8.Bb2 Nc6 9.Na3 Nf6 10.Nc4 g6 (10...e5 11.e3–+) 11.a5 (11.Nf3 Bg7–/+) 11...Bg7 12.Nf3 Rb8 (12...Qe6 13.d3–/+) 13.Ba3 (13.c3 0–0–/+) 13...Qe6 14.d3 b5 (better is 14...Ne4!?–/+) 15.ab6 ab6 16.0–0 (16.Ng5!? Qd7 17.Nf7=+) 16...0–0–/+ 17.Re1 (17.Ng5 Qd7–/+) 17...Nd5 18.Ng5 Qd7 19.Ne4 (19.Bc1 b5 20.Na5 Na5 21.Ra5 Nc3–+) 19...f5–+ 20.Ng5 (20.Ned6 Nc3 (20...ed6?! 21.Bd5 Kh8 22.Bc1–/+) 21.Bc6 Qc6 (21...Nd1?! 22.Bd7 Bd7 23.Red1–/+; 21...ed6 22.Bd7 Nd1 23.Bc8 Rfc8 24.Red1+/–) 22.Nc8 Qc8–+) 20...h6 21.Nh3 e5 22.f4 Nc3 23.Qd2 e4 24.de4 fe4 25.Nb6? Rb6 26.Bc5 Rb8 27.Bf8 Kf8 28.f5 gf5 29.Qf4 Nd5 30.Qf1 Ne3 0–1. Wunnink,Alex – Gouma,Ronald, Haarlem op, 1996.

5.e3 Qd7 6.Nf3 f6 7.d4 e6 8.Bd3 Bd6 9.Nh4 (9.0–0 Ne7=+) 9...f5 (9...Nh6 10.0–0–/+) 10.Qh5=+ Qf7 11.Qf7 Kf7 12.f4 (12.Nf3 Nf6=+) 12...b6 13.Nf3 Ba6 14.Ba6 (14.Ng5 Ke7–/+) 14...Na6–/+ 15.a4 (15.0–0 Nf6–/+) 15...Nf6 16.Na3 (16.Nbd2 Ng4 17.Ke2 Rac8–/+) 16...c6–+ 17.h3 (17.Bd2 Ne4–+) 17...Ne4 18.Ng5 (18.Bd2 Rhd8–+) 18...Ng5 19.fg5 Rhe8 (19...Kg6 20.h4–+) 20.0–0 (20.Kd2 e5–+) 20...Kg6 21.h4 Bg3 22.Be1 Be1 23.Rfe1 e5 24.c4 ed4 25.ed4 Re4 26.cd5 cd5 27.Nb5 Rae8 28.Kf2 Nb4–+ 29.Re4 Re4 30.g3 a6 31.Nc7 Rd4 32.a5 b5 33.Nb5 ab5 34.a6 Nc6 35.a7 Na7 36.Ra7 Ra4 37.Rb7 Ra6 38.Rb5–/+ Rd6 39.Ke3 Kh5 40.Kd4 Kg4–/+ 41.Rb7 g6 42.Rh7 Kg3 43.Rf7 Kh4 44.Rf6 Rd8 45.Rg6–/+ f4 46.Rg7 f3 47.Rf7 Kg3 48.g6 Rd6?? 49.g7= Rg6 50.Kd5?? f2–+ 51.Ke5 Kg2 52.Kf5 Rg3 53.Ke6 Re3 54.Kd5 Rd3 55.Ke6 Re3 56.Kd5 Rg3 57.Ke6 0–1. Krickemeyer,Horst – Huguet,Bernard (2185), Wch Seniors Bad Liebenzell, 1996.

5.e3 Qd7 6.h3 e5 7.Be5= Nc6 8.Bc3 Nf6 9.Nf3 (9.Bf6 gf6 10.Nf3 d4+=) 9...Bc5 (9...Be7 10.Bb5=+) 10.Ne5 (better 10.Bf6!? gf6 11.d4+=) 10...Qe6=+ 11.d4 (11.Nc6 Qc6 12.Qf3 Be7=+) 11...Ne5 12.dc5 Nc6 13.Bd3 d4 14.Bb2 de3 15.fe3 Qe3 16.Be2?? (better 16.Qe2!? Qe2 17.Ke2–/+) 16...Qg3 (better 16...Ne4 17.Qd3 Qf2 18.Kd1 Qg2–+) 17.Kf1 Bf5 (17...0–0 18.Qd3 Qg5 19.Qf3–+) 18.Bf3 (18.Bf6 gf6 19.Bf3 Bd7–+) 18...Rd8 (18...Ne4!? 19.Qe1 0–0–0 20.Be4 Qe1 21.Ke1 Be4 22.Kf2–+) 19.Qe2–/+ Kf8 20.Nc3 (20.Bf6 gf6 21.Bc6 bc6–+) 20...Nd4–+ 21.Qe3? (better 21.Qd2 Ne6 22.Qe3–+) 21...Nc2 (21...Bc2?! 22.Qd2 Qg6 23.Ne2–+; 21...Nf3?! 22.Qf3 Qf3 23.gf3 Bc2 24.Ne2–+) 22.Qf2 Bd3 23.Kg1 Qf2 24.Kf2 Na1 25.Ba1 Bg6 (better 25...Nd7!? 26.Bb2 Nc5 27.Ba3–+) 26.Bb7 h6 27.c6 Rd2 28.Kg1 (28.Kf3 Rd3 29.Ke2 Rg3–+) 28...Ne4 29.Kh2 Nc3 30.Bc3 Ra2 31.Bb4 (31.Re1 f6 32.Bb4 Kg8–+) 31...Kg8 32.Re1 Kh7 33.Re7 Rd8 34.Rc7 (34.Be1–+) 34...Be4 35.Rf7 (35.Rd7 Rg2 36.Kh1 Rd2 37.Kg1 R2d7 38.Kf2–+) 35...Rg2 36.Kh1 Rd1 37.Rf1 (37.Be1 Re1 38.Rf1 Rf1) 0–1. b4_Bb2 (1645) – nail65 (1650), lichess.org, 2020.

5.e4 Qa4! 6.ed5 Qe4 7.Be2 (7.Qe2 Qc2; 7.Ne2 Qd5) 7...Qg2 8.Bf3 Qg5.

5.e4 Qc6 6.ed5 Qd5 –/+.

5.e4 Qd7

6.a4 d4 (6...de4 7.Ne2–+) 7.Bb2–/+ e5 8.Qh5 Bd6 9.Bc4 (9.f4 Nf6 10.Qg5 Qe6–/+ (worse 10...Ne4 11.Qg7 Rf8 12.fe5=)) 9...Nf6–+ 10.Qf3 0–0 11.d3 Qg4 (11...Nc6 12.c3–+) 12.h3 Qf3 13.Nf3 c5 14.0–0 Nc6 15.c3 Re8 16.Ng5 Be6 (16...Re7 17.Na3–/+) 17.Bb5 (17.Ne6!? fe6 18.Nd2=+) 17...Rac8 18.c4 (18.Ne6 Re6 19.a5 Bc7–/+) 18...Re7 19.Bc1? (better 19.Ne6 Re6 20.Bc6 Rc6 21.Nd2–/+) 19...Nb4–+ 20.Ne6 fe6 (20...Re6 21.a5 a6 22.Ba4 Nd3 23.Nd2–+) 21.a5 Nd3 22.Bg5 h6 (22...Ne4?! 23.Be7 Be7 24.Bd7–+) 23.Bf6 gf6 24.Nd2 Rg7 25.a6 b6 26.Ra3 (26.g3 Nf4–+) 26...Nf4 27.Kh2 (27.g3 Nh3 28.Kg2–+) 27...Rg2 28.Kh1 Kf7 29.Nf3 Rcg8 30.Rg1 (30.Bc6 R2g6–+) 30...Rg1 (better 30...Rf2 31.Ne1–+) 31.Ng1 d3 32.Ba4 (32.Ra2 Be7–+) 32...f5 33.ef5 (33.Ra2 Rd8 34.f3 Bc7–+) 33...ef5 34.Bd1 (34.Ra2 Ke6 35.Bd1 e4–+) 34...e4 35.f3 (35.h4–+) 35...e3 36.Rd3 Nd3 37.Be2 (37.f4 Nf2 38.Kh2 Bf4) 37…Nf2 0–1. Adjailton (1875) – rjmaf (2025), lichess.org, 2016.

6.ed5 Qd5 7.Nf3 Nc6 8.Bb2 –/+.

6.ed5 Qd5 7.Nf3 Nf6 8.Be2 e6 (8...Nc6 9.Bf6 ef6 10.Nc3–/+) 9.Be5 Qd8 10.0–0 Bd6 11.d4 0–0 12.Bf6 (12.Qd3 Nc6=+) 12...Qf6–/+ (12...gf6?! 13.Nbd2=+) 13.Nbd2 b6 14.Bd3 Bb7 15.Re1 Nd7 16.c4 Qh6 17.Qc2 c5 18.Be4 Rab8 19.Qa4 Nf6 (19...Bc8 20.dc5 bc5 21.Rad1–/+) 20.Qa7=+ Ne4 21.Ne4 Qg6 22.Ng3? (better is 22.Nh4 Bh2 23.Kh2=+) 22...Bf3–+ 23.gf3 cd4 24.Re4 f5 25.Rh4 Rf7 (26.Qa4 Be7 27.Rd4 Bf6–+) 0–1. Schmid,W – Feist,M, Porz, 1991.

6.ed5 Qd5 7.Nf3 Bg4 8.Be2 e6 9.0–0 Nd7 10.h3 Bh5 11.g4 (11.Re1 0–0–0=+) 11...Bg6–/+ 12.d3 0–0–0 13.Nh4 (13.Bd4 Nb6–/+) 13...Ne7 14.Bf3 Qc5 15.d4 Qc4 16.Ng2 (16.g5 Nd5 17.Qd2 Nc3 18.Ng6 hg6 (18...fg6?! 19.Qc3 Qb5 20.Qe3=+) 19.Qc3 Nb6–+) 16...Ne5 17.Be2 Qa4 18.Ne3 (18.Qe1 N5c6–+) 18...N5c6 (18...c5!? 19.de5 Rd1 20.Rd1–+) 19.Bc4 h5 20.Bb3 Qb5 21.Bc4 Qg5 22.f4 Qh4 23.Be1?! (23.Rf3–+) 23...Qh3 24.Rf3 Bc2 25.Rh3 (25.Qe2 Nd4 26.Rh3 Ne2 27.Be2 Bd3–/+) 25...Bd1 26.Nd1 Rd4 27.Bb3 (better is 27.Ne3!?–/+) 27...Rf4 28.gh5 Ne5 (better is 28...Rf5!?–+) 29.Nbc3? (better is 29.Nf2–/+) 29…Nf3–+ (30.Rf3 Rf3–+) 0–1. Hoffmann,Piotr – Pilczuk,Andrzej, corr 1. AMM Poland, 1991.

6.ed5 Qd5 7.Nf3 Bg4 8.Be2 Nf6 9.0–0 Nbd7 10.Bb2 e6 11.Nc3 Qc5 12.d4 (12.h3 Bh5=+) 12...Qc6–/+ 13.Re1 Bb4 (13...a6 14.Nd2 Be2 15.Qe2–/+) 14.Bb5=+ Bf3 15.Bc6? (15.Qd3 Qd6 16.Qf3–/+) 15...Bd1–+ 16.Bd7 Kd7 17.Red1 Nd5 18.Ne4 f5 (18...b5 19.a3 Bd6 20.Nc5 Ke7 21.h3–/+) 19.Nc5=+ Bc5 20.dc5 Kc6 21.Bg7 Rhg8 22.Bd4 (22.Be5 Kc5 23.Rab1 b5=+) 22...Rae8 (22...Nf4 23.g3–/+) 23.c4 (23.Be5!?=+) 23...Nf4–/+ Black fights for the Initiative 24.g3 Ne2 (24...e5 25.Be3–/+) 25.Kf1 Nd4 26.Rd4 e5 27.Rd2 (27.Rd5 Rg4 28.Re1 Rc4 29.Rde5 Re5 30.Re5 Rc5 31.Re6 Kb5–/+) 27...Rg4 (27...Kc5?! 28.Rd7 c6 29.Rb7=+) 28.Rad1 (28.Rc1 Rd4 29.Rb2 Rb8–/+) 28...Re7 29.f4 (29.Rc1!?–/+) 29...ef4–+ 30.Rd5 fg3 31.Rf5 (31.hg3 Rf7 (< 31...Rc4 32.Rf5 Rg7 33.Rh5–+) 32.Kf2 f4 33.gf4 Rgf4 34.Ke3 Rf3 35.Ke2 Rf2 36.Ke3 Ra2–+) 31...g2 (< 31...gh2 32.Kf2 Rc4 33.Rh1 Rc2 34.Kg3 Re3 35.Kg4–+) 32.Kf2 Reg7 33.Rg1 (33.Kg1 Rc4 34.h3 Rc5–+) 33...Rc4 34.h4 Rc5 35.Rf6 Kb5 36.Rb1 Ka5 37.Rf3 g1Q! 38.Rg1 Rc2 (39.Ke3 Rg1–+) 0–1. Wendel,E – Herzog,M, Badischer Schachkong, 1990.

4.Be5 Qb5

5.Bc7 Na6 6.Be5= f6 7.e3 Qc6 8.Nc3 Bd7 (8...fe5? 9.Bb5 Qb5 10.Nb5+–) 9.Bb5 Qe6 10.Ba6 Qa6 11.Nd5 0–0–0 12.Nb4 Qa4 13.Bc3 e5 14.Rb1 Ne7 15.Ne2 Nc6 16.a3 Nb4 (16...Bf5 17.d3+=) 17.Bb4+/– Bc6 18.Nc3 Qa6 19.e4 Bd6 20.Qg4 Kb8 (20...Bd7 21.Qg7 Bb4 22.Rb4 Qa3 23.Rb1+–) 21.Qg7 Bb4 22.ab4 (22.Rb4?! Qa3 23.Rb1 Qd6+=) 22...Qc4 23.Qf6 Ka8 (23...Qd4 24.0–0+–) 24.f3 Rhg8 25.Qe5 Rg2 26.d3 (26.b5 Be8 27.d3 Qf7+–) 26...Qg8 (better is 26...Qf7 27.Ra1 a6+–) 27.b5 Be4 28.Ne4 (28.Qe4?! Re8 29.Kd1 Re4 30.fe4 Qg5=; 28.fe4?! Rc2 29.Rf1 Rc8+–) 28...Rg1 (28...Rc2 29.Qg5 Qg5 30.Ng5 Rd3 31.f4+– (31.Nh7?! Re3 32.Kd1 Ree2=)) 29.Ke2 Qg2 (29...Rg2 30.Ke3 Rc2 31.Rbc1 Rd3 32.Kd3 Qc4 33.Ke3 Rc1 34.Rc1 Qc1 35.Kf2 Qc2 36.Kg3+–) 30.Nf2 Rh1 31.Rh1 Qg6 32.Kd1 Re8 33.Qf4 Qg2 (33...Qb6 34.Ne4+–) 34.Qg3 Qg3 (34...Rg8 35.Re1 Qg3 36.hg3+–) 35.hg3 (35...Re7 36.Ne4+–) 1–0. marekt (2195) – domari (1915), ICC, 2003.

5.Bc7 Na6 6.Be5 f6 7.Bg3 e5 (7...Qb2 8.Nc3 Nb4 9.Rc1=+) 8.e3 Qc6 9.Nc3 Bd7 (9...Nc7 10.f4 e4 11.Rb1=+) 10.Bb5 Qd6 11.Bd7 (11.Ba6 Qa6 12.Nd5 Qc4+=) 11...Qd7= 12.Nf3 (12.Nge2 Nh6=) 12...Ne7 13.Nh4 Nf5 (better 13...g5!? 14.Qh5 Kd8=+) 14.Qh5+– g6 15.Ng6 Ng7 (15...Qf7!? 16.Nd5 Qg6 17.Nf6 Kf7 18.Be5 Bg7 19.Qg6 hg6= (worse 19...Kg6 20.Ng4+–)) 16.Qh4 (16.Nf8 Nh5 17.Nd7 Kd7 18.Nd5 Rac8+–) 16...hg6 (16...Nf5!? 17.Qh3 Rg8 18.Nf8 Rf8 19.Nd5 Qd5 20.Qf5 Qg2+–) 17.Qh8+– 0–0–0 18.Qh3 (better 18.Qh7 Qf5 19.Rc1+–) 18...f5?? (better 18...Qh3 19.gh3 Nf5+–) 19.Be5+– Nh5 (19...Re8 20.Bd4 Nb4 21.Kd1+–) 20.Bd4 Nb4 21.Kd1 (21.Rc1 Nc6+–) 21...a5 (21...Nc6 22.Ne2+–) 22.Bb6 Re8 23.Ba5 (better 23.Rb1 Nc6+–) 23...Qc6 (23...d4 24.ed4 Qd4 25.Bb4 Bb4+–) 24.Bb4 (24.a3!? d4 25.ab4 dc3+–) 24...Bb4 25.Ne2 Qa4 (25...Nf6 26.f3+–) 26.Qh4 (better 26.g4!? Ng7+–) 26...Re4 27.f4 Rc4 28.Nd4 (better 28.Rc1 Ba3 29.Nc3 Rc3 30.dc3 Bc1 31.Kc1 Qa2 32.Rd1 Qa3 33.Kd2+–) 28...Bc5?? (28...Bd2 29.Qe7 Be3 30.Qf8 Kc7 31.Nb5 Kb6+–) 29.Nb3 Ba3 30.Qe7 (better 30.g4 Bb2 31.gh5 Ba1 32.Na1 Qa2 33.Ke2+–) 30...Be7–+ 31.d3 (31.c3 Nf6–+) 31...Rc3 32.Kd2 (32.Re1 Kd8 33.g3 Ba3–+) 32…Bb4 (32...Bb4 33.a3 Rd3 34.Ke2 Rc3–+) 0–1. Abdullaevich (1935) – zazadin (1940), lichess.org, 2020.

5.Bc7 Qb2 6.Nc3+= d4 7.Rb1 dc3? (better is 7...Qa3 8.Nb5 Qc5+=) 8.Rb2+– cb2 9.Qb1 Na6 10.Bg3 Nf6 11.Qb2 e6 12.Be5 Be7 13.Qb5 Kf8 14.c3 Nc5 15.Bf6 gf6 16.d4 Nd7 17.e4 a6 18.Qh5 b5 19.Qh6 Ke8 20.Qg7 Rf8 21.Qh7 Bb7 22.Bd3 (22.Ne2 Nb6+–) 22...Rc8 (22...f5 23.Ne2+–) 23.Ne2 b4 (23...f5 24.ef5 Bg2 25.Rg1+–) 24.cb4 Bb4 25.Kd1 Ke7 26.Nf4 Rg8 27.Rg1 (27.Ke2 a5 28.Rb1 Ba8+–) 27...Ba3 (27...Bc3 28.d5 e5 29.Nh5+–) 28.Ke2 Rg4 (28...Bd6 29.Rb1 Bc6 30.e5 (30.Ba6?! Ra8 31.d5 Bf4 32.dc6 Rh8 33.Qh8 Rh8+–) 30...Be5 31.de5 Ne5 32.Qh3 (32.Ba6?! Rh8+–) 32...Nd3 33.Nd3 Bg2 34.Qe3 Rc2 35.Kd1+–) 29.Ne6! Rcg8 (29...Ke6 30.Qf5) 30.h3 R4g6 31.Rb1 Bc6 (31...Ba8 32.Nc7+–) 32.d5 Bb5 (32...Ba8 33.g3+–) 33.Bb5 ab5 34.Rb5 Rg2 35.Rb7 Bd6 (35...Rb8 36.Rd7! Kd7 37.Qf7 Be7 38.Nc5 Kd6 39.Na6 Rb2 40.Kd3+–) 36.Nd4 Bc5 37.Qf5 Bd4 (37...Rd8 38.Nc6 Kf8+–) 38.Qd7 (38...Kf8 39.Qf7#) 1–0. marekt (2190) – domari (1890), ICC, 2003.

5.Bc7 Qc6 6.Be5 Nd7 7.Nf3 Ne5 8.Ne5 Qc7 9.Nf3 (9.f4 f6 10.Nd3 Bg4+=) 9...e5 10.e4 (10.e3 a6–/+) 10...de4–/+ 11.Bb5 (11.Ng5 f5–/+) 11...Bd7–+ 12.Bd7 Qd7 (12...Kd7?! 13.Ng5 Nh6 14.Ne4=) 13.Ng5 (13.Ne5 Qd4 14.Qh5 g6 15.Ng6 hg6 (15...Qa1?! 16.Qb5 Kd8 17.Nh8 Qh8 18.Qb7=; 15...fg6?! 16.Qb5 Kf7 17.Qb7 Ne7 18.Qa8 Qa1 19.0–0–/+) 16.Qb5 Kd8 17.Qb7 Rc8–+ (17...Qa1?! 18.Qa8 Kd7 19.Qb7 Kd6 20.Ke2+=)) 13...Nf6 (13...Qf5 14.Nh3–+) 14.Nc3 (14.Qe2!? Rc8 15.Nc3–/+) 14...Qf5–+ 15.Nh3 Bc5 (15...Bb4 16.Ne2 Rd8 17.c3–+) 16.Rb1 b6 17.Qe2 0–0 18.Na4 (18.Rg1 Bd4 19.g4 Qc8–+) 18...Bd4 (18...Rac8!? 19.0–0–+) 19.c3–/+ e3 (19...Bc5 20.Nc5 bc5 21.0–0–/+) 20.0–0 ef2 21.Kh1 Bc5 22.Nc5 bc5 23.Rb5 Rac8 24.Nf2–/+ Qc2 25.a3 Rfd8 26.Qe5 Rd2 27.Qc5 Rcd8 28.Qc7= R2d7 29.Rb8+/– Qd2 30.Rd8 Rd8 31.Kg1 Re8 32.Qc4 Qe3+= 33.Qd4 Qe7 34.h3 Qa3–/+ 35.c4 Qe3 36.Qe3 Re3 37.Ra1 Re7 38.Nd3 g6 39.Nb4 Rc7 40.Ra6 Ne4 41.Nd5 Rd7 42.Kf1+= Kg7 43.Ke2 Nc5 44.Rc6 Ne6 45.Ke3 h5 46.Ke4 a5 47.Ke5 Ra7 48.Kd6 a4–+ 49.Nb4 a3 50.Na2 g5 51.Rb6 Ra5 52.Rb5 Ra6 53.Ke5 Rc6 54.Kd5–/+ Ra6 55.Rb3?? Ra5 56.Kd6 Rc5 57.Ra3 Rc4–+ 0–1. Vasii,Gheorghe – Vladila,Alina (2085), Radulescu mem, 2000.

5.Bc7 Qc6!? 6.Bg3 Bf5=+.

5.Bc7 Nc6 6.e3 Qb2 (6...Qc5 7.Nc3=) 7.Nc3+= Bf5 8.Bd3 (8.Rb1!? Qc2 9.Qc2 Bc2 10.Rb7+–) 8...Bd3= 9.cd3 Nb4?? (better 9...Qa3=) 10.Qa4+– Nc6 11.Rb1 b5 (11...Qb1 12.Nb1 Rc8+–) 12.Rb2 (better 12.Qa6 Qb1 13.Nb1+–) 12...ba4+– 13.Na4 (13.Nd5 e6 14.Nc3 Nf6+–) 13...e6 14.Nf3 Nb4 15.Rb3?? (better 15.Ke2+–) 15...Rc8=+ 16.Be5 (16.Ba5!? Rc1 17.Ke2 Rh1 18.Bb4=+) 16...Rc1–/+ 17.Ke2 Rh1 18.a3?? (better 18.Rb4 Bb4 19.Bg7–/+) 18...Nc6–+ 19.Bc7 f6 0–1. GuestMKNW – Maimaki, freechess.org, 2017.

5.Bc7 d4 6.a4 Qc5 7.Bg3 Bf5 8.c3 Nc6 9.Qb3 (9.Nf3 e5=+) 9...dc3 10.Qc3 e6 11.e3 (11.Na3 Qc3 12.dc3 Rd8=+) 11...Nf6 12.Nf3 Ne4 13.Qc5 Bc5 14.Bb5 Ng3 (14...a6 15.Bc6 bc6 16.Nc3=+) 15.hg3 0–0 (15...Rc8 16.d4 Bb4 17.Ke2=+) 16.0–0 (16.Bc6!? bc6 17.Nc3=) 16...Nb4 (16...Rac8 17.Nh4 Be4 18.d3=+) 17.d4 Bd6 (17...Nc2 18.Ra2 a6 19.Ba6 ba6 20.dc5=+) 18.Nbd2 Rfd8 19.Rfd1 Rac8 (19...a6 20.Be2=+) 20.e4 Bg6 21.Rac1 Na2 22.Rc8 Rc8 23.e5 (23.Bd3 Nc3 24.Ra1 f6=+) 23...Nc3–/+ 24.Ra1 Bb4 25.Bf1 (25.Kh2 a5 (< 25...Nb5 26.ab5 Ra8 27.Ra4=) 26.Bc4 Nb1 27.Rb1 Bb1 28.Be6 fe6 29.Nb1 Rc2–+) 25...Rd8 26.Nc4 Rd5 27.Ne3 Ra5 28.Bc4 Ra4 29.Ra4 Na4 30.d5 ed5 31.Nd5 Nb2 32.Bb3 Nd3 33.Nb4 Nb4 34.Ng5 h6 35.e6 fe6 36.Ne6 Bf7 37.Kf1 a5 38.Nc5 Bb3 39.Nb3 a4 40.Nc5 a3 41.Ke2 a2 42.Nb3 Na6 43.Kd2 Nc5 Black gets the initiative 44.Na1 Ne4 45.Ke3 Nf6 46.Kd4 Kf7 47.f3–/+ Nh5 48.Kc3 Ng3 49.Kb2 Ke6 50.Ka2 Nf5 51.Nc2 Ke5 52.Kb2 Kf4 53.Kc3 Kg3 54.Kd3 g6 55.Ke4 h5 56.Ne1 Nh4 57.f4 Ng2 58.Nd3 h4 59.Ne5 h3 60.Nf3 Nh4 61.Nh4 Kh4 62.Kf3 b5 63.Kf2 Kg4 64.f5 gf5 65.Kg1 b4 66.Kh2 b3 67.Kg1 f4 68.Kh2 b2 69.Kg1 b1Q 70.Kh2 Qb2 71.Kg1 Qg2# 0–1. Kaczorowska,Barbara – Chess Genius, Warszawa, 1993.

5.Bc7 d4 6.e3 Qb2 7.Nc3 (better is 7.Na3 Qa3 8.ed4–+) 7...dc3 8.Rb1 cd2 9.Kd2 Qa2 10.Bb5 Nd7 11.Ke2 a6 12.Ra1 Qb2 (12...ab5?! 13.Ra2 Ra2 14.Qb1–+) 13.Rb1 (13.Bc4 Qc3 14.Ra4 e6–+) 13...Qc3 14.Bd7 Bd7 15.Rb7 Qc6 16.Qb1 Rc8 17.Ba5 Qg2 (18.Rd7 Qg4 19.Nf3 Qd7–+) 0–1. Brogger,Gunnar – Pech,Jaroslav (2045), 04. VCC–Open, 2001.

5.Bc7 Nf6 6.e3 Qc6 7.Bg3 Bg4 8.f3 Bd7 9.Nc3 a6 10.Bd3 e6 11.Nge2 Bd6 12.0–0 0–0 13.Qe1 Qc7 14.Bd6 Qd6 15.Qh4 h6 16.Rab1 b5 17.a4 ba4 18.Na4 Ba4 19.Qa4 Nbd7 20.Nd4 Ne5 21.Be2 Ned7 22.Qc6 Qc6 23.Nc6 Rfe8 (23...a5!?+=) 24.Ra1+= Nb8 25.Nb8 Reb8 26.Ba6 g6 27.Kf2 g5 (27...Rb2 28.Bd3 Rba2 29.Ra2 Ra2 30.Rb1+/–) 28.Bd3 Kg7 29.Ra8 Ra8 30.Rb1 Ra7 31.c4 Ra3 32.Ke2 g4 (32...dc4 33.Bc4 Ra4 34.Rc1+/–) 33.c5+– gf3 34.gf3 e5 35.c6 Ra8 36.Bf5 (36.Rb7 e4 37.fe4 Ne4+–) 36...Ne8 37.Bd7 Kf8 (better is 37...Nf6 38.Bh3 Ne8+–) 38.Rb5 Nc7 39.Rb7 Ne6 (39...Ne8 40.c7 Nc7 41.Rc7 Ra5+–) 40.Be6 fe6 41.c7 (41.c7 Rc8 42.Rb8+–) 1–0. forsetinn (1800) – kashub, gameknot.com, 2013.

5.e4 Qa5 6.ed5 Nc6 +=.

5.Bc7 Qc5

6.Bb8 Rb8 7.Nf3 Bf5 8.c3 Nf6 9.d4 (9.e3 Be4+=) 9...Qa5 10.Qb3 Rc8 Attacks the backward pawn on c3 (10...e6 11.e3+=) 11.Nfd2 (11.e4 Ne4 (worse is 11...de4 12.Ne5+/–; 11...Be4 12.Ne5 a6 13.Qb7 Rc3 14.Nd2+/–) 12.Bb5 Kd8 13.Qd5 Nd6–+) 11...Bb1 12.Rb1 Qc3 13.Qa4 Qc6 (13...Kd8 14.f3 a5 15.Rb7–/+) 14.Qc6+= Rc6 15.e4 Rc7 (worse is 15...Ne4 16.Bb5 Nd6 17.Bc6 bc6 18.Nf3+=) 16.Bb5 Kd8 17.e5 Nd7 18.0–0 (18.Ke2 e6+=) 18...e6–/+ 19.Nb3 (19.f4 f6–/+) 19...a6 20.Bd7 Kd7 (20...Rd7?! 21.Na5 b5 22.a4=) 21.Rfc1 Ba3 22.Nc5 (22.Rc7 Kc7 23.Kf1 Rc8–/+) 22...Rc5 23.Rc5 Bc5 24.dc5 Rc8 25.Rb7 Rc7 26.Rc7? (better is 26.Rb6 Rc5 27.g4–/+) 26...Kc7–+ 27.Kf1 Kc6 28.Ke1 (28.Ke2–+) 28...Kc5 29.Kd2 Kd4 30.f4 Ke4 31.g3 Kf3 (better is 31...h6!? 32.a3–+) 32.Kd3 Kg2 33.g4 (33.Ke2 h5 34.a3 d4–+) 33...Kh2 34.f5 Kg3 35.fe6 fe6 36.g5 h5 37.Kd4 h4 (better is 37...Kf4!? 38.Kd3–+) 38.Kc5 h3 (better is 38...Kf4 39.Kd6 Kf5 40.Ke7–+) 39.Kd6 h2 40.Ke6 h1Q 41.Kf7 Qf3 (better is 41...Qh5 42.Kf8 Qg5 43.e6 Qf6 44.Kg8 Qe6 45.Kf8–+) 42.Kg7 Qf5 (better is 42...Kf4 43.Kf6 Qc3–+) 43.g6 Qe5 (43...Kf4 44.e6 Kg5 45.a4 Qf6 46.Kh7 Qg6 47.Kh8 Kf6 48.e7 Qg7) 44.Kf7–+ d4 0–1. Leonov,Vladislav (2165) – Chernov,Mikhail (1995), RUS–chB U16 Dagomys, 2009.

6.Be5 Nc6 7.Bb2 (7.Nf3 Ne5 8.Ne5 Qd4 9.Nf7 Kf7–+ (9...Qa1?! 10.Nh8 g5 11.Nc3 Qd1 12.Kd1=)) 7...Bf5 8.Na3 e5 9.e3 Nf6 10.Nf3 Qa5 (10...Be7 11.Bb5 a6 12.Bc6 bc6 13.Ne5=+) 11.Qc1 (11.Nb5 a6 12.Nc3 b5–/+) 11...Rc8 12.Nb5? (better is 12.Rb1!?–/+) 12...Nb4–+ 13.Bc3 (13.Na3 Nc2 14.Nc2 Rc2–+ (14...Bc2 15.Bd3 Qa4 16.Be5=)) 13...Rc3! 14.Nc3 (14.dc3 Nc2) 14...Nc2 15.Kd1 Ba3 16.Bb5 Ke7 17.Qc2 Bc2 18.Kc2 Rc8 19.Kd1 Rc3! (20.dc3 Ng4–+) 0–1. Zschorn,Ernst – Hayward,Keith, casual game, 2002.

6.Bf4? Qd4–+ 7.Bb8 Qa1 (7...Rb8?! 8.Nc3=+) 8.Bf4 e5 (< 8...Qa2 9.Nc3 Qa5 10.e4 de4 11.Nb5–+) 9.Bg3 Nf6 10.Nf3 (10.Nc3 Qd1 11.Kd1 Bc5–+) 10...Bd6 (10...e4 11.Be5 Qa2 12.Nd4–+) 11.d4? (better is 11.Nc3 Qb2 12.Be5 Be5 13.Ne5–/+) 11...Bb4–+ 12.c3 (12.Nbd2 Bd2 13.Nd2 Qd4–+) 12...Bc3 13.Nc3 Qc3 14.Nd2 (14.Qd2 ed4 15.Be5 Qa1 16.Qd1 Qa2 17.Bd4 Bf5–+) 14...ed4 15.Be5 Ne4 (15...Ng4!? 16.Bg7 Rg8 17.Qa4 Bd7 18.Bd4 Qd2 19.Kd2 Ba4 20.h3–+) 16.Bg7 Rg8 17.Be5 (17.Bh6 Bf5–+) 17...Bd7 18.f3 Nc5 19.g3 (19.Bd6–+) 19...Qe3 20.Qc2 (20.Nc4 dc4 21.Bd4–+) 20...Rc8 21.Bf4 (21.Nc4 Nd3! 22.Qd3 Rc4 23.Qe3 de3 24.Bb2–+) 21...Nd3! 22.Kd1 (22.Qd3 Rc1) 22…Rc2 (23.Kc2 Nf4 24.gf4 Qc3 25.Kd1 Qa1 26.Kc2 Ke7 27.e3 Ba4 28.Nb3 Qa2 29.Kd3 Qb3 30.Kd4 Qb2 31.Kd5 Rd8 32.Kc5 Qc3 33.Bc4 b6#; 22...Nf2 23.Kc1 Rc2 24.Kc2 Qc3 25.Kb1 Nd1 26.Nc4 Bf5 27.e4 de3 28.Bd3 Bd3#) 0–1. Losoff,A – Moore,T, Wisconsin USA, 1982.

6.Bg3 Nc6 7.c3 Nf6 8.e3 Ne4 9.Ne2 (9.Nf3 e6=+) 9...h5 10.h4 g6 11.f3 (11.Bh2 Bg7=+) 11...Ng3–/+ 12.Ng3 e5 13.Be2 Be7 14.d4 Qd6 15.Nf1 Be6 16.Nbd2 Rb8 17.Nb3 b6 (17...Qc7 18.de5 Ne5 19.Bb5 Kf8 20.Kf2–/+) 18.Kf2 (18.de5 Ne5 19.Nd4 Rc8=+) 18...0–0–/+ 19.Nfd2 f5 (19...Qc7 20.Rc1–/+) 20.de5=+ Ne5 21.f4 (21.g3 Rfc8=+) 21...Nd7 22.c4 Nf6 23.Nd4 Bf7 24.cd5 Bd5 25.Bf3 Rbd8 26.Qa4 Rd7 (26...Ng4!? 27.Bg4 A) 27...hg4?! 28.Nc4 (28.Qa7?? Ra8 29.Qa8 Ra8–+) 28...Qb4 29.Qb4 Bb4 30.Ne5=; B) 27...fg4–/+) 27.Nc4= Bc4 28.Qc4 Kh7 29.Rac1 Qa3 30.Rc3 Qb2 31.Rc2 Qa3 32.Rc3 Qd6 (32...Qb4 33.Rhc1=) 33.g3 (better is 33.Ne6!?+/–) 33...Qb4 34.Qb4 Bb4 35.Rc6 Bc5 (35...Be7 36.Ke2=) 36.Nb3 (better is 36.Ne6!? Rff7 37.Ng5 (< 37.Nc5 bc5 38.Ke2 Rb7+=) 37...Kg7 38.Nf7 Kf7 39.Rd1 Ne4 40.Kg2+/–) 36...Bb4 37.Rhc1 Rff7 38.R1c2 Ng4 (38...Rd6 39.Nd4=) ½–½. Koivumaki,Marko – Koskinen,Veikko, FIN–chT2, 2003.

6.Bg3 Bf5 7.d3 (7.Nc3 d4 8.e4 dc3=) 7...Nd7 8.Nd2 (8.Nf3 d4=+) 8...Rc8 (8...e5 9.e4 Be6 10.Rb1=+) 9.c4 (9...dc4 10.Nc4=+; 9.e4 de4 10.de4 Bg6=). pumpkin (2290) – lkbo, net–chess.com, 2006.

5.Bc7 Nd7

6.a4 Qc6 7.Bg3 Nc5 (7...Ngf6 8.e3=+) 8.Nc3= Nf6 9.e4 Bd7 The pressure on the isolated pawn grows (9...Nce4?? 10.Bb5+–; 9...Nfe4?? 10.Bb5 Nc3 11.Bc6 bc6 12.dc3+–) 10.Nb5 Na6 11.e5 Ne4 12.Bf4 e6?? (better is 12...g5 13.Be3 Bg7=) 13.f3+– d4 14.fe4 Qe4 15.Ne2 Bb4 (15...Bb5 16.ab5 Nb4 17.d3+–) 16.Kf2 (better is 16.Nbd4!? f6 17.ef6 e5 18.fg7 Rg8+–) 16...Bc5 17.d3 Qf5 18.h3 g5 19.g4 Qg6 20.Bh2 0–0 (better is 20...Bc6 21.Bg2 Rd8+–) 21.Bg2 Nb4 22.Rf1 (22.Nbd4!? Bc6 23.Kf1 f5 24.Nc6 Nc6+–) 22...f5 23.ef6 Rf6 24.Kg1 Rf1 25.Kf1 Qg7 (25...Rf8!? 26.Kg1 Bc6+–) 26.Kg1 e5 27.Ng3 Rf8 (27...Bc6 28.Nf5 Qf6 29.Qe2+–) 28.Qe2 (28.Ne4 Be7+–) 28...a6 29.Nh5 Qe7 30.Nc7 Bd6 (30...Bc6 31.Qe5 (31.Be5?! Bd6 32.Re1 Bc7+=) 31...Bg2 32.Kg2 Nc2 33.Rb1+–) 31.Nd5 Nd5 32.Bd5 Be6 (32...Kh8 33.Bb7 a5 34.Ng3+–) 33.Qe4 Bd5 (33...Rf7+–) 34.Qd5 Kh8 35.Re1 Re8 (35...h6 36.Re5 Qf7 37.Qf7 Rf7 38.Re8 Rf8 39.Be5 (39.Bd6?! Re8 40.Bc5 Rd8+–) 39...Kg8 40.Rf8 Bf8 41.Bd4+–) 36.Ng3 (better is 36.Rf1 Qe6 37.Qb7 Qe7 38.Qe7 Be7 (38...Re7?? 39.Rf8) 39.Be5 Kg8 40.Bd4 Rc8+–) 36...Bb8 37.Nf5 Qb4 38.Bg3 (38...b6 39.Qb7+–; 38.Rf1 Qf8+–) 1–0. Norbeck,Ivar – Jegerborn,Kurt, corr SSKK Veteran–SM, 1986.

6.Nc3 Qc5 7.Bg3 e5 8.e3 a6 9.Be2 (9.Nge2 Qc6=) 9...Ngf6+= 10.Nf3 Bd6 11.Na4 (11.0–0 Qc6+=) 11...Qa3–/+ 12.Nc3 b5 13.0–0? (better is 13.Nb1 Qa5 14.0–0+=) 13...b4–+ 14.Nd5 Nd5 15.e4 (15.Qc1 Qc1 16.Rfc1 f5–+) 15...N5f6 16.d4 Qa5?? (better is 16...Ne4 17.Ne5 Be5 (17...Ng3 18.Nc4 Nf1 19.Na3+=) 18.Be5 Ne5 19.de5 Nc3–+) 17.de5+= Be5 18.Ne5 Ne5 19.Qd6 Nfd7 20.a3 Ng6?? (better is 20...f6 21.ab4 Qb6 22.Qb6 Nb6 23.Be5 fe5=) 21.Qc6+– (21.ab4?! Qb6=) 21...Ra7 22.Qc8 Ke7 23.Qc6 (23.Qc4!? ba3 24.Bd6 Kd6 25.Qd4 Ke7 26.Qa7 Rd8+–) 23...Nge5 24.Be5 Ne5 25.ab4 Nc6 26.ba5 (26.Ra5?! Na5 27.ba5 Rb8+=) 26...Nd4 27.Bd3 Rc8 28.Ra4 Ne6 29.Rc4 Nc5 30.e5 g6 31.Rb1 Rac7 32.f4 (32.Be2 Rd8+–) 32...Kd7 (better is 32...Nd3 33.Rc7 Rc7 34.cd3 Rc5+–) 33.Rd4 Ke7 34.Rd6 Rc6 35.Rc6 Rc6 36.Kf2 (36.Rb6!? Rc8+–) 36...Nd3 37.cd3 The passed pawn on d3 will become decisive later 37...Rc2 38.Kf3 Ra2 39.Rb7 Ke8 40.Rb8 Ke7 41.h4 (41.g4 Ra5 42.Rh8 Ra3+–) 41...Ra5 42.g4 Ra1 43.Rh8 a5 44.Ra8 a4 45.d4 a3 46.d5 a2 47.d6 (47.Kg2!? Kd7+–) 47...Ke6+/– 48.Kg2 h5 49.gh5 gh5 50.Ra7 f6 51.d7 Rd1 52.d8Q (better is 52.Ra2 fe5 53.Re2+/–) 52...Rd8= 53.Ra2 fe5 54.Re2 Rd5 55.Kf3 Rd3 56.Re3 Re3 57.Ke3 Kf5 58.fe5 Ke5 59.Kf3 Kf5 60.Kg3 Ke5 61.Kg2 Kf4 62.Kh3 Kf3 63.Kh2 Kg4 64.Kg2 Kh4 65.Kh2 Kg4 ½–½. Tidemalm,Gustav – Bergljung,Andreas, corr SSKK Veteran–SM, 1987.

6.e3 Qc5 7.Bg3 Ngf6 8.d4 Qa5 9.Qd2 Qd2 (9...Qb6 10.Nc3=) 10.Nd2+= e6 11.Bd3 Bb4 12.Ne2 0–0 13.c3 Be7 14.0–0 (14.c4 b6+=) 14...b6= 15.e4 (15.Rac1 Bb7=) 15...de4 16.Ne4 Bb7 17.Nd6 Bd6 18.Bd6 Rfc8 19.f3 Rc6 20.Bf4 Nd5 Exerts pressure on the backward pawn 21.Bd2 N7f6 (21...Rac8 22.Rfc1+=) 22.a4 a5 23.c4 Nc7 24.Rab1 (24.Rfd1 Rd8+=) 24...Ba6 25.Rfc1 Nce8 (25...Rc8 26.Nf4+=) 26.Nf4 g5 27.Ne2 h6 28.f4 gf4 29.Nf4 Rd8 (29...Rac8 30.c5 bc5 31.Rc5 Rc5 32.dc5=) 30.Be3 Ng4 (30...Nd6!? 31.d5 ed5 32.cd5 Rc1 33.Rc1 Bd3 34.Bb6 Rc8 35.Rc8 Nc8+=) 31.d5+– ed5 32.Bb6 Rdd6 (better 32...Rb6!? 33.Rb6 Bc4 34.Bc4 dc4+–) 33.c5+– Rf6 34.Bb5 Bb5 35.ab5 Rb6 36.cb6 (36.Nd5?! Rb8 37.Nf6 Ngf6+–) 36...Rb6 37.Nd5 Rb8 38.b6 Ne5 39.Rc5 Rb7 (39...Kg7+–) 40.Ne7! (40.Ne7 Re7 41.Re5 Re5 42.b7+–) 1–0. Johansson,Roland – Bergljung,Andreas, corr SSKK Veteran–SM, 1987.

6.e3 Qc6 7.Bg3=.

6.Nf3 d4 7.a4 Qc5 =.

4.Be5 c6

5.Nc3 Nd7 6.Rb1 Qc5 7.bc6 Ne5 8.cb7 Bb7 9.Rb7 Qc6 +/–.

5.bc6 Nc6= 6.a3 (6.c3 Qb2 7.Bg7 Bg7–+ (7...Qa1?! 8.Bh8 Bf5 9.e4 de4 10.Bc4=)) 6...Qb6 (6...Qe4 7.Bc7 Nd4 8.d3=+) 7.Bg3 (7.Nf3 Ne5 8.Ne5 Qd4 9.Nf7 Kf7–+) 7...g6 (7...e5 8.Nf3 Bc5 9.e3=+) 8.e3 (8.Nc3 Nf6=) 8...e5 (8...Bg7 9.d4=) 9.Nc3 Nge7 (9...Nf6 10.Bb5 Bd6 11.Rb1=) 10.Rb1 Qd8 11.Nf3 Bg7 12.Bb5 0–0 13.0–0 e4 14.Ne1 Qa5 15.Bc6 (15.Rb3 Bc3 16.dc3 a6 17.Bc6 Nc6=+) 15...bc6 16.Rb3 (16.Bd6 Re8=+) 16...Ba6 17.Bd6? (better is 17.Ne2=+) 17...Bf1–+ 18.Be7 Bc4 (better is 18...Rfe8!? 19.Bb4 Qa6–+) 19.Bf8 (19.Bb4!? Qc7 20.Bf8 Bf8 21.Rb1–/+) 19...Rf8–/+ 20.Rb7 Qa3 21.Qb1 a6 22.Rb6 Bc3 23.dc3 Bb5 24.c4 Qc5 25.Rb7 Qc4 26.h3 Qf1 27.Kh2 Qf2 28.c4 Bc4 29.Rb8 Rb8 30.Qb8 Kg7 31.Qd6 Qf6 32.Qc5 Qe5 33.Kg1 Qc3 (34.Qd4 Qd4 35.ed4 e3–+) 0–1. Moeseneder,Christian – Scharfenberg,Michael, GER–chJ NRW, 1996.

4.Be5 d4

5.a4 Nd7 6.Bg3 e5 7.Qc1 a6 8.ba6 b6 9.c3 dc3 (9...Qc5 10.Nf3=) 10.Nc3= c6 (10...Bd6 11.Rb1 Qa5 12.Nb5+=) 11.e3 (better is 11.Nb5! cb5 12.Qc6+–) 11...Ba6 12.Ba6 Ra6 13.Nd5 (13.Nb5! Ra4 14.Ra4 Qa4 15.Qc6 Qa1 16.Ke2+=) 13...Qd6+= 14.Nc3 Nc5 15.Qc2 Nd3 16.Ke2 Nb4 17.Qf5 Ne7 (17...f6 18.Qc8 Kf7 19.d4=) 18.Qb1 (better is 18.Qe5!? Qd3 19.Kf3+=) 18...Nbd5+= 19.Ne4 Qc7 20.Nf3 f6 21.Rc1 Qd7 (21...Qd8 22.d4 f5 23.Neg5=) 22.a5 (22.d4!?+=) 22...Nc8 (worse is 22...ba5 23.Nc5 Qc8 24.Na6 Qa6 25.Qd3 Qd3 26.Kd3 Nb4 27.Kc4+–; 22...Ra5?! 23.Ra5 ba5 24.Qb8 Nc8 25.Qa8+=) 23.ab6 Rb6 24.Qa2 Be7 25.Ne1 (25.d3 0–0=) 25...h5+= 26.h4 0–0 27.Nc5 (27.Nf3!?=) 27...Bc5–/+ 28.Rc5 Kh8 29.Rac1 Rd8 30.Nf3 (better is 30.Qc2!? Qg4 31.Kf1+=) 30...Nb4–+ 31.Qc4 (31.Qa5 Nd3 32.Rc6 Rb5 (worse is 32...Rc6 33.Rc6 Nd6 34.Rc7+=) 33.Qd8 Qd8–/+) 31...Nd3 32.Rc2?? (better is 32.Rc3 Nc5 33.Qc5–+) 32...Nc5 33.Qc5 Qd3 34.Kd1 Rb1 35.Rc1 e4 36.Nd4 Qf1 37.Kc2 Qc1 0–1. Mauron,Regis – Bouvier,Clement (1775), 12e Tournoi de Nol, 2009.

5.Bc7? Qb2 6.Na3 Qa3 –+.

5.Bc7? Qb5?! 6.a4 Qc5 7.Bb8 Rb8 8.e3 =.

5.e3= c5 (5...de3 6.fe3 (6.Bc7?? ef2 7.Kf2 Qd4 8.Ke1 Qa1–+) 6...Qh4 7.Bg3+=) 6.Qc1 (better is 6.ed4!? Nd7 7.a3+/–) 6...de3= 7.fe3 Bf5 8.Nc3 e6 9.Be2 Nd7 10.Bg3 Qa5 11.a4 Qd8 (11...Ngf6!?=) 12.Bf3+/– Qc8 13.a5 Ngf6 (better is 13...a6!?+/–) 14.a6+– b6 15.Nge2 (15.Bb7 Qd8+–) 15...e5 16.Bb7 Qd8 17.0–0 Be6 18.Ba8 Qa8 19.d3 Be7 20.Be1 (20.d4 e4+–) 20...0–0 21.Ng3 Rd8 22.Nce4 Ne4+/– 23.de4 Nf6 24.Qb2 Ne4= 25.Qe5 Bf6 26.Rf6 Nf6 27.Nf5 Bf5=+ 28.Qf5 Qe4 29.Qe4 Ne4 ½–½. Ho Hou Meng – Schadler,M (2170), 37th Olympiad, 2006.

5.Nf3 c5 A) 6.Qc1 A1) 6...Nd7 7.Bg3 (7.Bf4 f6 8.c3 dc3 9.dc3+=) 7...Ngf6 8.e3 de3 9.fe3=; A2) 6...f6 7.Bg3 (7.Bb8 Rb8 8.e4 e5 9.c3+=) 7...Qb5 8.e3 Qd7 9.ed4=; B) 6.a4 B1) 6...f6 7.Bc7 (7.Bg3 e5 8.e4 Be6 9.c3=) 7...e5 8.c3 Qb2 9.Na3=; B2) 6...Nd7 7.Bc7 (7.Bg3 Ngf6 8.Qc1 e6 9.e3+=) 7...Ngf6 8.c3 Qb2 9.Ra3=.

5.Nf3 f6 6.Bd4 e5 7.Bc3 (7.a3 Qa5 8.Bc3 Qb5 9.e3+=) 7...Qb5 8.e3 Qb6 (8...Qd5 9.Bb2+=) 9.Nh4 (9.d4!?+=) 9...Be6= 10.Bd3 Nh6 11.Qf3 Nd7 12.Nf5 Nf5 (12...Nf7 13.e4–/+) 13.Bf5= Bf5 14.Qf5 Nc5 ½–½. Rudol,Matylda – Larysz,Anna, Mistrzostwa Miedzywojewodzkie Juniorow Poland, 2011.

4.Be5 Nd7

5.Bc7 Qb5 (--> 4.Be5 Qb5 5.Bc7 Nd7).

5.Bc7 Qc4 6.Bg3 Qb5 7.e3 +=.

5.Bc7 Qc4 6.Bg3 Qb5 7.Nf3 +=.

5.Bc7 d4 6.a4 e5 7.e3 (7.e3 Qb2 8.Na3 Ba3 9.Rb1–+). Knabe,Johan – Mach,Jiri, IECG, 2009.

5.Bc7 e5 6.e3 d4 7.Nf3 (7.ed4!? ed4 8.Ne2–/+) 7...Qb2–+ 8.Ne5 de3 9.Nf7 (9.de3 Qa1 10.Bc4 Bb4 11.Ke2 Ngf6 12.Nf7 0–0 13.Nh6 Kh8 14.Nf7 Rf7 15.Bf7 Nf8–/+) 9...ef2 (9...Kf7 10.Bc4 Ke8 11.Nc3=) 10.Kf2 Qf6 (10...Kf7 11.Bc4 Ke8 12.Re1 Be7 13.Nc3+–) 11.Qf3 Bc5 12.Ke1 Qf3 (12...Qa1 13.Qb3 Bf2 14.Kf2 Qf6 15.Kg3 Qf7 16.Qf7 Kf7 17.Bc4 Kg6 18.Bd3 Kh5 19.Re1–+; 12...Kf7 13.Bc4 Ke8 14.Qh5 g6 15.Qe2 Ne7 16.Nc3–+) 13.gf3 Kf7 14.Bc4 Kf8 (14...Kg6!? 15.c3 Nb6 16.Be2–+) 15.Nc3 Nb6 16.Bb6 Bb6 17.Ne4 (17.Nd5 Ba5–+) 17...Bh3 18.Ke2 Re8 19.a4 Nf6 20.d3 (20.a5 Ne4 21.fe4 Re4 22.Kd3 Rd4 23.Kc3 Bc5–+) 20...Nh5 (20...g6!? 21.a5 Bd4 22.Ra4–+) 21.a5 Bd4 22.Ra4 Nf4 23.Kd2 Be5 24.b6 a6 25.Nc5 Bg2 26.Re1+= Bc3 27.Kc3 Re1 28.Ba6 ba6 29.Rf4= Ke7 30.Na6 Rb1 31.Kc4 Bh3 32.Nc5 Be6 33.Kc3 Bd5 34.Rd4 Bf3 35.Rd7= Kf6 36.b7 Rb5 37.Rd6 Ke5 38.Re6?? Kd5–+ 39.Re3 Rc5 40.Kb4 Rc7 41.c4 Kd4 42.Rf3 Rb7 43.Ka4 Rhb8 44.a6 Rb1 45.Rf4 Kc3 (45...Kc3 46.Rf1 Rf1 47.a7 Ra1#) 0–1. Graf,M (1880) – Wiley,To (2280), Deizisau GER, 7th Autumn Open, 2012.

5.Bc7 e5 6.e3+= f6 7.a3 Qe7 8.Ba5 Qf7 9.Nf3 Bd6 10.d4 e4 11.Nfd2 f5 12.c4 Ne7 13.c5 Bb8 14.Nc3 0–0 15.Qb3 Nf6 16.Be2 Be6 17.0–0–0 (better is 17.f4!?+/–) 17...f4+= 18.Bb4 Nf5 19.g4 fe3 20.Nf1 ef2 21.gf5 Bf4 22.Kb2 Bf5 23.Ng3 Bg6 24.Rhf1 e3 25.Bd3 (better is 25.Bf3 Rfd8 26.Nce2+=) 25...Bd3–/+ 26.Rd3 Bg3 27.hg3 Rfe8 28.Ne2 (better is 28.Nd1!? e2 29.Rf2 ed1N 30.Rd1+=) 28...Ng4–+ 29.Rdd1 Nh2 30.Qd3 Nf1 31.Rf1 Qf3 32.Nf4?? (better is 32.Kb1–+) 32...e2 33.Qf3 ef1Q 34.Qd5 Kh8 35.Ng6 hg6 (35...hg6 36.Qh5 gh5 37.Kc2 Qc4 38.Kb2 Re2 39.Bd2 Rd2 40.Kb1 f1Q#) 0–1. Graf,M (1850) – Wiley,To (2295), 23rd Staufer–Open, 2011.

5.Bg3 Ngf6 6.e3 Ne4 7.Ne2 Qb5 8.Bc7 Qc6 9.Bg3 e5 10.Nbc3 Ng3 11.Ng3 Bb4 12.Nb5 a6 13.Qg4 Be7 (13...ab5?! 14.Qb4 Ra4 15.Qb2=) 14.Nc3 (14.Qg7? Bf6 15.Qh6 ab5–+) 14...Nf6 15.Qd1 (15.Qg7? Rg8 16.Qh6 Bf8–+) 15...d4 16.ed4 ed4 17.Nce2 Bc5 18.Nf4 Bd6 19.Nge2 0–0 (19...Bf4 20.Nf4 0–0 21.f3–/+) 20.Nd4 Re8 21.Nfe2 Qd5 22.c3 Ng4 23.Qb3 Qg5 24.Nf3 Qf6 25.h3 Ne5 Black gets the initiative 26.Ne5 Re5 27.d4 Re7 28.Qd5 Bf5 29.Rd1 Rae8 30.Qf3 Qg6 31.Rd2 h5 (32.c4 Bb4–+) 0–1. Nicholls,Mervyn (2310) – Pecot,Laurent (2495), email CAPA Pappier Mem B, 1998.

5.Bg3 Ngf6 6.e3 Ne4 7.Ne2 Qb5 8.Bc7 e5 9.f4 +=.

5.Bg3 Ngf6 6.e3 Ne4 7.Ne2 Ng3 8.Ng3 e6 (8...e5 9.a3 Qa5 10.c4 dc4 11.Bc4+=) 9.Nc3 (9.a3 Qa5+=) 9...Qa5 10.Bd3 (10.Be2 Bb4 11.Nb1 0–0+=) 10...c5 (10...Bb4 11.0–0+=) 11.bc6 bc6 12.0–0 Bb4 13.Qg4 (13.Nge2 e5+=) 13...0–0 (13...Bc3 14.dc3 Qc3 15.Rab1+=) 14.Qh4 (14.Rfb1 Bc3 15.dc3 Qc3+=) 14...f5 15.Rab1 Rb8 16.a3 (16.Rfd1 Rb6+=) 16...Ba3 17.Rb8 Nb8 18.Ra1 Qc5 (18...Rf7 19.f4+=) 19.Qa4 Bb4 20.Qa7 Qa7 (20...Qd6 21.Rb1+=) 21.Ra7 e5 22.Ra8 (22.Kf1 g6+=) 22...Bd6 23.Na4 (23.Ra7 g6+=) 23...Be6–/+ 24.c3 (24.Nc3 g5–/+) 24...e4 (24...g5 25.Be2–/+) 25.Bc2 Nd7 26.Ra7 Rd8 (26...g5 27.Ne2 Kf7 28.Nd4+=) 27.f4 (27.d4 Kf7+=) 27...Kf7 28.Ra6 (28.d4 h6+=) 28...Nb8 29.Ra5 Rc8 (29...Ke7 30.Nc5 Bc5 31.Rc5+=) 30.Ra8 (30.d3 Kf6+=) 30...Re8 (30...c5 31.Kf2+=) 31.Ra5 (31.d4 Nd7 32.Ra6 Rc8+=) 31...Nd7 (31...h6 32.d3–/+) 32.Ra6 Rc8 33.Ne2 Nb8 34.Rb6 h6 35.Kf2 (35.Nd4 g5+=) 35...g5 36.g3 Nd7 (36...Be7 37.Nd4+=) 37.Ra6 Kf6 (37...Nf6 38.Nd4+=) 38.Nd4 Nb8 39.Ra8 (39.Rb6 Bd7+=) 39...Rg8 (39...c5 40.Nb5 Bf8 41.Nb6=) 40.Bb3 (40.d3 Bf7+=) 40...Rd8 ½–½. forsetinn (1785) – kraftwerk (2125), gameknot.com, 2013.

3.b5 c5

4.Ba3 b6 5.d4 e5 6.de5 Qe5 7.c3 Bd7 8.Nf3 Qf6?? (8...Qe6 9.e3=+) 9.e3?? (better 9.Qd5 Nc6 10.bc6 Bc6 11.Qe5 Be7 12.Bc1+–) 9...a6 (9...Ne7 10.Bb2=) 10.ba6 (better 10.Qd5!? Ra7 11.ba6+–) 10...Ne7= (worse 10...Na6 11.Qd5 Nc7 12.Qb7+=) 11.Be2 Na6 12.0–0 g6 13.Bb2 Bg7 Attacking the isolated pawn on c3 14.Qd2 0–0 15.Na3 Rfd8 16.Rab1 Qd6 (16...c4 17.Nd4=+) 17.c4= Nb4 18.Bg7 Kg7 19.cd5 Ra3?? (better 19...Qf6 20.Rb3 Ba4–/+) 20.Qb2+– Kg8 21.Qa3 Ned5 22.Rfd1 Qc6 (22...Bf5 23.Rbc1+–) 23.Ne5 (23.Qb2 Bf5 24.Rbc1 Qe6+–) 23...Qe6 (23...Qa4 24.Rb3 Qa3 25.Ra3 Bf5+–) 24.Nd7 Rd7 25.Qa8 Kg7 26.a3 (26.Bc4 Qe4 27.Rbc1 Nc3 28.Qe4 Rd1 (28...Ne4?? 29.Rd7 b5 30.Bf7+–) 29.Rd1 Ne4+–) 26...Nc6 (26...Na2 27.Ba6 Nac3=) 27.Bc4 Ra7 (27...Nce7 28.Qa4+–) 28.Bd5 Qd5 29.Rd5 Ra8 30.Rb6 (30.Rb6 Ra3 31.g4+–) 1–0. aravind555 (1830) – alexeidv (1820), lichess.org, 2020.

4.a4 e5 5.d3 a6 6.Nf3 d4 7.c4 f5 8.Qc2 Nf6 9.Nbd2 (9.e3 Be7+=) 9...Be7 10.g3 0–0 11.Bg2 Bd8 12.0–0 Re8 Black prepares the advance e4 (12...Ba5 13.e3=) 13.Ne1 (13.a5 Re7=) 13...Ba5+= 14.Nb3 Be1 (14...Bb4 15.a5+=) 15.Rfe1= e4 (15...f4 16.a5=) 16.de4 (16.Bc1 b6=) 16...fe4 17.e3 d3 18.Qd2 (18.Qc3 Bf5=) 18...b6+= 19.a5 ab5 20.cb5 Be6 (20...c4 21.Nd4 ba5 22.Ra4=) 21.Bf6= Bb3 22.Qc3 (22.ab6 Bd5 23.Ra8 Ba8=) 22...Qf6 (22...Bc2!? 23.Bg7 d2+=) 23.Qb3= Qe6 (23...Qf7 24.Qf7 Kf7 25.a6+=) 24.Qe6+= Re6 25.Bf1?? (better is 25.a6 Nd7 26.Ra4+=) 25...Ra5–+ 26.Ra5 ba5 27.Rd1 (27.Rc1 Nd7–+) 27...Nd7 (27...c4!? 28.Kg2–+) 28.Bh3 Rd6 29.Bd7 (29.Bf5 c4 30.Be4–+) 29...Rd7 30.b6 (30.Kf1 c4 31.Ra1–+) 30...c4 31.Kg2 (31.b7 Rb7 32.Kf1 c3–+) 31...c3 Black plans d2 32.Rc1 c2 33.f3 (33.h3–+) 33...ef3 34.Kf3 d2 35.Rc2 d1Q 36.Kf4 (36.Re2 Qf1 37.Rf2 Rf7 38.Kg4 Rf2 39.Kh5 Qh3 40.Kg5 Rf5) 36...Qc2 0–1. Anastasiou,Efthymios – Koutsidis,Mihail (2080), Patron CC–ch, 2008.

4.c4 dc4 5.e3 (5.Na3 c3 6.Bc3 Be6+–) 5...Qd5 (5...Nf6 6.Nf3+=) 6.Nc3+– Qf5 (6...Qe6 7.Rc1 Nd7 8.Na4+–) 7.Bc4 a6 (7...Nd7!?+–) 8.Nf3 ab5? (better 8...Be6 9.Be2 Nf6+–) 9.Nb5 Be6 (9...Na6 10.Ne5 Nh6+–) 10.Nc7 Kd8 11.Be6 fe6 12.Na8 Nd7 (12...Nc6 13.Qa4 Nf6 14.Qb5+–) 13.Qa4 g5 (13...Ngf6 14.Qa5 Ke8 15.Nc7 Kf7+–) 14.Bh8 g4 15.Qa5 Ke8 16.Nc7 Kf7 17.Nh4 Qg5 18.Qa8 Qh4 19.Qe8 1–0. DEFFM – GuestNXBX, freechess.org, 2019.

4.c4 d4 5.d3 e5 6.Nd2 f5 (6...Nf6 7.Ngf3=+) 7.Ngf3 (7.e3 Nf6=+) 7...Nf6=+ 8.e4 fe4 9.Ng5 (9.Ne4 Ne4 10.de4 Be7=+) 9...ed3 10.Bd3 Be7 (10...a6 11.0–0=+) 11.0–0 (11.Nh7 Nh7 (worse 11...Rh7 12.Bh7 Nh7 13.Qh5 g6 14.Qh7+–) 12.Qh5 g6 13.Bg6 Kf8–/+) 11...0–0–/+ 12.Qe2 (12.Re1 Nbd7–/+) 12...Bg4 (12...Ng4 13.Ngf3=+) 13.f3=+ Bh5 14.Nge4 (14.Rae1 Nbd7=+) 14...Qc7 15.Ng5 Bf7 16.Bf5 (16.Rfe1 Nbd7=+) 16...Kh8 17.Qd3 (17.Rae1 Bg8 18.f4 Nd5 19.Bh7 A) 19...Bh7 A1) 20.cd5?! Bg5 (20...Rf4 21.Rf4 Nc6 22.d6 Bg5 23.dc7 Bf4 24.bc6 bc6 25.Qg4+–) 21.fg5 Nd7=; A2) 20.Ne6 Qa5 21.Nf8 Bf8 22.fe5+–; B) 19...Nf4 20.Qe5 Qe5 21.Re5 Bg5 (21...Bh7 22.Re7 Bg8 23.Rf3+–) 22.Bg8 Bh6–+ (worse 22...Rg8 23.Rg5 Rf8 24.Rc5+–; 22...Kg8?! 23.Rg5 Nd7 24.Ba3–/+)) 17...g6 (17...Bg8 18.Ne6 Be6 19.Be6–/+) 18.Be6=+ Be6 (better 18...Be8=+) 19.Ne6+– Qd6 (19...Qa5 20.Nf8 Bf8 21.Ne4+–) 20.Nf8 Bf8 21.Ne4 Ne4 22.Qe4 (22.fe4 Nd7+–) 22...Qc7 23.f4 (23.Rfe1 Nd7+–) 23...Nd7 (23...ef4 24.Rf4 (24.Qf4?! Qf4 25.Rf4 Nd7=) 24...Bd6 25.Rh4+–) 24.Rae1 (24.f5 Nf6 25.Qh4 g5 26.Qg5 Bg7+–) 24...Bg7 (24...ef4 25.Rf4 (worse 25.Qf4 Qf4 26.Rf4 Nb6–/+) 25...Kg7 26.Ref1+–) 25.Bc1 Rd8 (25...Rf8 26.fe5 Re8 27.Rf7 Re5 28.Qh4 Re1 29.Qe1+–) 26.fe5 (26.f5 gf5 27.Rf5 Rf8+–) 26...Ne5+– 27.Bf4 Re8 28.Qd5 1–0. qphys8 (1920) – carlog (1860), gameknot.com, 2017.

4.bc6 Qc6 5.e3 a6 6.Nf3 Bg4 7.h3 (7.Be2 Nf6=) 7...Bf3+= 8.Qf3 d4?? (better is 8...Qc2 9.Bc3 e6–/+) 9.Bd4+/– Qf3 10.gf3 Nc6 11.Bc3 e5 12.Bg2 h5 13.d3 Bb4 14.0–0 (14.f4 Bc3 15.Nc3 ef4+/–) 14...a5 (14...Nf6 15.Bb2+=) 15.a3 Bc3 16.Nc3 Nf6 17.Nb5 0–0? (better is 17...0–0–0!?+=) 18.Nd6+– Rab8 19.Rab1 Nd8 20.Nc4 Nc6 21.Nd6?? (21.Rb5 Rfc8+–) 21...Nd8 22.Rb5 b6 23.Re5 Ne6 24.f4 Nd7 (24...Rfd8 25.Nc4+–) 25.Rh5 g6 26.Rb5 Kh7 (26...Nc7 27.Rg5+–) 27.Kh2 (27.Bc6 Nc7 28.Bd7 Rfd8+–) 27...Nc7 28.Rg5 Ne6 29.Rg4 Ng7 30.Rg1 f5 (30...Ne8 31.Nb5+–) 31.Rg3 (better is 31.Rh4 Nh5 32.Bf3 Ndf6+–) 31...Rf6 32.Nc4 Nh5 33.Rg5 Nf8 34.Bf3 Rc8 (34...Ng7+–) 35.Bh5 gh5 36.Rh5 Rh6 37.Rf5 Ng6 (37...Ne6 38.Rf7 Kh8 39.f5+–) 38.Rf7 Kh8 39.f5 (better is 39.Rf6!? Kh7 40.Rb6 Rc7+–) 39...Nh4 40.Ne5 Rg8 (40...Rc2 41.Rf8 Kh7 42.Kh1 Nf5 43.Rf5 Rh3 44.Kg2+–) 41.Rg8 (41.Rb7 Rf6 42.Rg8 Kg8+–) 41...Kg8 42.Kg3 Rh7 (42...b5 43.Kg4 Nf3 44.Kf3 Rh3 45.Ke4+–) 43.Rh7 Nf5 44.Kf4 Kh7 45.Kf5 b5 46.Nc6 a4 47.c3 (47.c3 Kg7 48.d4+–) 1–0. pittol – grudina, gameknot.com, 2015.

4.e3 Nf6 5.Nf3 Bg4 (5...Nbd7 6.Be2=) 6.Be2 Bf3 (6...Nbd7 7.0–0=) 7.Bf3 e5 8.0–0 Be7 9.d4 (9.c4 e4 10.Be2 dc4=) 9...e4 (9...Nbd7 10.de5 Ne5 11.Nd2=) 10.Be2 (10.dc5 Qc5 11.Be2 Nbd7=) 10...c4 11.Ba3 Qd7 12.Be7 Qe7 13.a4 (13.Nc3 a6=) 13...0–0 14.c3 a6 15.Nd2 Nbd7 16.h3 (16.Qc2 b6+=) 16...ab5 17.ab5 Ra1 (17...Ra3 18.Ra3 Qa3 19.Qc2+=) 18.Qa1= Nb6 19.Qa7 Qc7 20.Qa3 (20.Ra1 Nfd7=) 20...Ra8+= 21.Qc5 (21.Qb2 Qd7+=) 21...Ne8 (21...Qd8–/+) 22.f3? (better is 22.Bg4!?+=) 22...Ra2–+ 23.Rd1 Qc5 (23...Na4!? 24.Qd5 Nc3 25.Qc4 ef3–+) 24.dc5–/+ Na4 25.c6? (better is 25.Ne4 Re2 26.Rd5 Re3 27.Rd8–/+) 25...bc6–+ (25...Nc3? 26.cb7 Nd1 27.b8Q+–) 26.bc6 (26.b6 Nc3 27.Bc4–+) 26...Nc3 27.Re1 Rd2 28.Bc4 (28.Kf1 Rb2 29.fe4 Ne4–+) 28...dc4 29.fe4 (29.Kf1 ef3 30.gf3 Nb5–+) 29...Rd1 (29...Ne2 30.Kf2 Nd4 31.Kg3 Nc6 32.Ra1–+) 30.Kf1 (30.Rd1 Nd1 31.Kf1 Nc3–+) 30...Re1 31.Ke1 Ne4 32.Kd1 (32.Ke2 Kf8–+) 32...f5 (32...Kf8 33.Kc1–+) 33.Kc2 (33.Ke2 h5–+) 33...c3 (33...Kf7 34.Kb1–+) 34.Kb3 (34.g4 g6 35.gf5 gf5–+) 34...Kf7 35.g4 g6 (35...g6 36.gf5 gf5–+) 0–1. Wandy,Kasim (1815) – Haisma,Henk (1615), BSG Pinkstertoernooi, 2013.

4.e3 e5

5.c4 d4 6.ed4 ed4 7.d3 (7.Nf3 Qe7 8.Qe2 Nf6+=) 7...Nf6 8.Nf3 b6 (8...a6 9.a4+=) 9.Nbd2 Bb7 (9...a6 10.ba6 Be7 11.Be2+=) 10.Be2= Nbd7 11.a4 (11.0–0 Be7=) 11...a5 (11...Be7 12.0–0+=) 12.0–0= Be7 13.Re1 (13.Nh4 g6=) 13...h6 (13...0–0 14.Ng5+=) 14.Bf1 0–0 15.Qc1 (15.Nh4 Bd8=) 15...Rfe8 16.Ba3 Bf8 17.Qb2 Qc7 18.Re8 (18.Re2 Re2 19.Be2 Re8–/+) 18...Re8–/+ 19.Re1 Re1 20.Ne1 Ng4 (20...Qf4–/+) 21.Ndf3 (21.g3 Bd6+=) 21...Bd6 (better is 21...Nde5!? 22.Be2 Nf3 23.Nf3 Bf3 24.Bf3 Qh2 25.Kf1 Ne5–+) 22.g3+= Ndf6 23.Qe2 g6 (23...Bc8 24.Bg2+=) 24.Bg2= h5 (24...Kg7 25.Bc1=) 25.Bc1 Kg7 26.h3 Nh6 27.Bh6 (27.Nc2 Nf5=) 27...Kh6 28.Nh4 Bc8 29.Nhf3 Kg7 30.Ng5 (30.Nc2 Qe7 31.Qd2 Bb7=) 30...Qe7 31.Qe7 Be7 32.Kh2 (32.Nef3 Nd7+=) 32...Ne8 33.f4 Nd6 34.Bd5 Bg5 35.fg5 Bf5 (35...f6 36.gf6 Kf6 37.Kg2+=) 36.Kg2 Ne8 (36...f6 37.gf6 Kf6 38.h4+=) 37.Bf3 Nc7 38.g4 (38.h4 f6 39.gf6 Kf6=) 38...hg4+= 39.Bg4 (better is 39.hg4!? Bc8 40.Kg3+=) 39...Bg4–+ 40.hg4 Ne6 41.Kg3 Ng5 42.Kf4 f6 43.Kg3 (43.Ng2 Kh6–/+) 43...Ne6 (43...f5 44.Ng2 Ne6 45.gf5 gf5 46.Nh4–+) 44.Kf3 f5 45.Ng2 (45.gf5 gf5 46.Ng2 Kf6–+) 45...Kf6 46.Ne1 (46.gf5 Kf5 47.Nh4 Kg5–+) 46...Ke5 47.gf5 Kf5 48.Ng2 g5 49.Ne1 0–1. Hess,Helmut (1615) – Barwich,Alfred (1850), 7th Berlin–ch Seniors, 2011.

5.d4 cd4 6.ed4= ed4 7.Qd4 Bf5 8.c4 Nf6 9.cd5 Bb1 (better is 9...Nd5!? 10.Bc4 Nb6=) 10.Rb1+/– Qb4 (10...Nd5 11.Rd1 Qb4 12.Rd2 Qd4 13.Rd4+/– (worse is 13.Bd4 Bb4+=)) 11.Qb4 Bb4 12.Kd1 0–0?? (better is 12...Nd5 13.Bg7 Rg8+/–) 13.Bf6+– Bc5 14.Bh4 Nd7 15.Ne2 (15.Rb2!? Rac8 16.Be2 Bd6+–) 15...Nb6 16.Nc3 Bd4 17.Rb3 Rac8 18.Kd2 (18.Ne2 Bc5+–) 18...f6 19.d6 Be5 20.Bg3 Bd6 21.Bd6 Rfd8 22.Ne4 f5 23.Ng3 (23.Rb4!? fe4 24.Rd4 Rd7+–) 23...Rd6 24.Rd3 Nc4 25.Ke1?? (better is 25.Kc2+–) 25...Re8+= 26.Re3 Ne3 27.fe3 Re3 28.Be2 g6 29.Kf2 ½–½. Nebe,Lutz (1620) – Saam,Armin (1840), Koblenz–ch, 1998.

5.d4 ed4 6.ed4 c4 7.Ba3 Qe6 8.Qe2 +=.

3.b5 c6

4.Ba3 c5 5.Nf3 b6 (5...e5 6.d3=+) 6.d4= e6 7.Ne5 (7.c4 Nf6=) 7...Bd7 (7...Nd7!? 8.Nd7 Qd7=+) 8.e3+= Nf6 9.Qf3 Qc7 10.Be2 c4 (better is 10...a6 11.ba6 b5=) 11.Bf8+/– (11.Nd7?! Nbd7 12.Bf8 Nf8=) 11...Kf8 12.0–0 (better is 12.Bc4!? a6 13.ba6+–) 12...Bb5+= 13.c3 Nbd7 14.Nd7 Qd7 (14...Bd7 15.Nd2=+) 15.Na3 (15.Nd2!?=) 15...Bc6 16.Rab1 (16.Nb1 h5=+) 16...h5 (better is 16...Ne4–/+) 17.Nb5?? (better is 17.Rb2=+) 17...Bb5–+ 18.Rb5 (18.Rb2–+) 18...Qb5 19.Qg3 Qd7 (19...Ne4 20.Qc7–+) 20.a4 (20.Bf3 h4 21.Qf4 Rd8–+) 20...Ne4 21.Qf4 (21.Qh4 Nc3 22.Bf3 Qa4–+) 21...Nc3 22.Bf3 (22.Bd1 Nd1 23.Rd1 Qa4–+) 22...Na4 (22...Qa4 23.Qd6 Kg8 24.Qe5–+) 23.Qe5 (23.e4 b5 24.Qd2 a5–+) 23...b5 24.Bh5 (24.e4 b4–+) 24...b4 (better is 24...f6 25.Qf4 Rh5 26.Qf3–+) 25.Bg4 (25...Nc3 26.e4–+; 25.Bf3 b3 26.Rc1 Qd8 27.Rc4 dc4 28.Ba8 c3–+) 1–0. pinecrest1981 – Curly, Live Game Caissa's Web, 2004.

4.a4 c5 5.c4 d4 6.e3 e5 7.ed4 ed4 8.Bd3 Nf6 9.Nf3 Be7 10.0–0 0–0 11.Re1 b6 (11...Re8 12.a5=+) 12.a5 (12.Qc2 Qd7 13.Bh7 Nh7 14.Qe4=) 12...Bb7 (better 12...ba5!? 13.Qc2 Bb7 14.Nd4 Ng4 15.Bh7 Kh8=+) 13.Nh4 Nbd7?? (13...Bd8 14.a6 Bc8+–) 14.Nf5+– (14.Nf5 Qf4 15.Ne7 (15.Re7? Ng4 16.Qg4 Qg4–+) 15...Kh8 16.Qe2+–) 1–0. GuestFKFW – GuestNGKQ, freechess.org, 2020.

4.a4 Nf6 5.Nf3 +=.

4.e3 Nf6 5.Nf3 Bg4 6.c4 e6 (6...cb5 7.cb5 Nbd7 8.Be2=) 7.Ba3 c5 8.h3 Bh5 9.Bb2 Be7 10.Be5 (10.g4 Bg6=) 10...Qd7 (10...Qe5 11.Ne5 Bd1 12.Kd1–/+) 11.Be2 a6 (11...0–0 12.Nc3=+) 12.0–0 (better 12.g4!? Bg6 13.g5=) 12...ab5=+ 13.cb5 0–0 (13...Bf3 14.gf3 0–0 15.Qc2–/+) 14.a4 Bd6 15.Bf6 gf6 16.Qc2 Bg6 17.Bd3 f5 18.Nc3 c4 19.Be2 Qc7 20.Rfb1 Nd7 21.b6 Nb6 22.Nb5 Qc6 23.Nfd4 Qc5 24.a5 (24.Nd6 Qd6 25.a5–/+) 24...Nd7 (better 24...f4!? 25.d3 Nc8–/+) 25.Nd6= Qd6 26.Rb7 The passed pawn on a5 quickly leads to threats 26...Nc5 27.Rb6 (27.Rb2=) 27...Qc7 (better 27...Qb6! 28.ab6 Ra1 29.Kh2 f4=+) 28.Rc6+= Qe7 29.Bc4 (29.f4 Rfb8+=) 29...dc4 (better 29...f4!? 30.Qa2 dc4 31.Qc4 Nd3–/+) 30.Qc4= Ne4 31.d3 Nd6 32.Qc5 Rfd8 33.Rc7 Qf8 34.Nc6 Rdc8 (34...Ne8 35.Nd8 Nc7 36.Qc7 Rd8 37.a6=) 35.Rc8 (35.Rd7 Ra6 A) worse 36.Qd6 Rcc6 (36...Rac6?! 37.Qf8 Kf8 38.a6+=) 37.Qd4 Rc8=+; B) 36.Rd6 Rac6 37.Qc6 (37.Rc6?! Qc5 38.Rc5 Rc5+=) 37...Rc6 38.Rc6+–) 35...Rc8 36.a6 (36.a6 Qe8 37.Rc1+– (37.Qd6?! Rc6 38.Qe5 Qa8=)) 1–0. sirgeshdb (1685) – Adri_3, lichess.org, 2020.

4.a4 Bf5

5.e3 e5 6.Nf3 Nd7 7.d4 e4 8.Ne5 Ne5 9.de5 Qc7 10.Be2 Bb4 11.c3 Ba5 12.0–0 Qe5 13.Qd4 Qd4 14.cd4 Ne7 15.Ba3 Kd7 16.f4 h5 17.h3 h4 18.Rc1 Rh6 19.Nc3 Ke8 20.Nd1 (20.bc6!? bc6 21.Rab1+=) 20...Rg6–/+ 21.Kf2 Bd7 22.Rc2 Nf5 23.Bh5 ½–½. Ovcharenko,Leonid – Tanashkin,Artem, Vladivostok op, 2008.

5.Nf3= Nf6 6.e3 Nbd7 7.c4 e6 8.Be2 Be7 9.0–0 0–0 10.Nh4 Bg6 (10...Bb1!? 11.Rb1 dc4 12.Bc4 Nb6=) 11.Ng6+= fg6 12.Ba3 c5 13.d4 b6 (13...Bd8 14.Nd2+=) 14.Bf3 Qc7 (14...Rac8 15.cd5 Nd5 16.Nd2+=) 15.Nc3 Bd6 16.h3 (16.cd5 Rae8+/–) 16...Rae8 (16...cd4 17.Bd6 Qd6 18.Qd4+= (worse is 18.ed4 Rac8–/+)) 17.cd5+/– ed5 (17...cd4!? 18.Bd6 Qd6 19.de6 Ne5 20.ed4 Nf3 21.Qf3 Re6+/–) 18.Nd5+– Nd5 19.Bd5 Kh8 20.Rc1 Rf6 (20...Nf6 21.dc5 bc5 22.Bc6+–) 21.dc5 (21.e4 Rf4+–) 21...Bc5 (21...Nc5 22.Qg4+–) 22.Bc5 Nc5 23.Bc6 Ree6 24.Qc2 Rd6 25.Rcd1 Rd1 26.Rd1 Rd6 27.Kf1 Rd1 28.Qd1 Kg8 (28...h6 29.Qd5+–) 29.g3 (better is 29.a5+–) 29...Qf7?? (better is 29...Kh8+–) 30.Bd5 (30.Qd8 Qf8 31.Bd5 Ne6 32.Be6 Kh8 33.Qf8) 30...Ne6+– 31.Qb3 (31.Qb3 Kf8 32.Be6+–) 1–0. Labahn,Wolfgang – Filges, Alligator–Pokal D–Gr, 1980.

3.b5 Bd7

4.a4 a5 5.e3 Nh6 (5...e5 6.Qh5 e4 7.Be5=) 6.Nf3 f6 (6...Bg4 7.h3 Bh5 8.g4=) 7.Ba3+= Qe6 8.Be2 g5 (8...Qf7 9.d4+=) 9.Nd4 Qf7?? (better 9...Qg8+=) 10.Bh5+– e5 11.Bf7 Kf7 12.Nb3 Bg7 (12...Bg4 13.f3 Be6 14.Bf8 Rf8 15.Nc5+–) 13.Qh5 Kg8 14.Nc3 Bg4 (14...c6+–) 15.Qe8 Bf8 16.Qf8 1–0. DEFFM – GuestWKSK, freechess.org, 2020.

4.e3 b6 5.c4 Nf6 6.cd5 Nd5 7.Nf3 Nb4 (7...c6 8.Ne5+=) 8.d4 (8.Ne5 c6+–) 8...a6 9.ba6 N8a6 10.Ba6 (10.Ne5 Nd5+=) 10...Na6 (10...Ra6 11.Ba3=) 11.0–0 e6 12.Ba3 Qd5 (12...c5!?=) 13.Bf8+= Rf8 14.Nc3 Qc6 15.Rc1 Qb7 16.Qb3 (16.Ne5 Nb4+–) 16...b5 (16...Bc6!? 17.Ne1 Rh8+=) 17.Ne5+– f6 (17...Rb8 18.Ne2+–) 18.Nd3 (18.Nd7 Kd7 19.d5 ed5 20.Nd5 Ke8+–) 18...e5 (18...Kf7!?+=) 19.de5+– fe5 (19...c5 20.Nd5 Qc6 21.ef6 gf6 22.N3f4+–) 20.a4 (better 20.Ne5 Nc5 21.Qd5 Qd5 22.Nd5+–) 20...ba4?? (better 20...b4 21.Nb5 Qb6+–) 21.Qb7 Kf7 22.Nd5 (22.Ne5 Kg8 23.Qd5 Be6 24.Qe6 Kh8 25.Nf7 Rf7 26.Qf7 a3+–) 22...a3 23.N5b4 (23.Ne5 Ke6 24.Nd7 Rfe8 25.Nc7 Nc7 26.Rc7 Kf7 27.Qd5 Re6 28.Ne5 Kf6 29.Qf3 Ke5 30.Qf4 Kd5 31.Rd1) 23...Nb4 24.Qb4 (24.Rc7 Ke6 25.Nc5 Kf6 26.Rd7 e4 27.Rd6 Ke5 28.Qe7 Kf5 29.h4 Nd3 30.Qe4) 24...Rfb8 25.Qc4 Be6 26.Qc7 (26.Ne5 Kf8 27.Qe6 a2 28.Nd7) 26...Kf6 (26...Kg8 27.Qe5 Bf7 28.Rc7+–) 27.Nb4! a2 (27...Rb4 28.f4 Combination) 28.Na2! Rb2 (28...Ra2 29.Qb8 Deflection (29.Qb8 Overloading); 28...Ba2 29.Rc6 Double attack) 29.Nc3 Rb3 30.Ne4 Kf5 (30...Kg6 31.Qe7 Bc4 32.Rc4 h6 33.Rc7 Rf8 34.Qg7 Kh5 35.Ng3 Kh4 36.Qh6 Kg4 37.Qh5) 31.f3 (31.Qg7 Ke4 32.f3 Kd3 33.Rfd1 Ke2 34.Qg3 Ke3 35.Qe5) 31...Re3 (31...Kg6 32.Qe7 Rc3 33.Qe6 Kh5 34.Qf5 g5 35.Qg5) 32.Qd6 (32.Qg7 Re4 33.fe4 Ke4 34.Rfe1 Kd3 35.Qg5 Ra2 36.Qe3) 32...Re8+– 33.Rc5 Rc8 34.g4 Kg6 (34...Kf4 35.Qe5) 35.Qe6 1–0. bambambambambambam – clawhammer, lichess.org, 2016.

4.e3 Qc5 5.a4 Bf5 6.Nc3 e5? (better 6...Qd6+=) 7.Ba3+– Qb6 8.Nd5 Qa5 9.Bf8 (9.Qf3 Bc2 10.b6 Ba3 11.Nc7 Ke7 12.Qb7 Bb4 13.Qa8 Bd2 14.Ke2 Nf6 15.Qa7 Bd3 16.Kd3 Qc3 17.Ke2 Qa1 18.Nd5 Ke6+–) 9...Kf8 10.Nf3 c6 11.Nc3 Nd7 12.bc6 bc6 13.Be2 Ngf6 14.0–0 h5 15.Ng5 h4 16.h3 e4 17.Bg4?? (17.f3 Re8+–) 17...Bg6?? (better 17...Bg4 18.f3 Qg5 19.fg4 Nb6–+) 18.Bd7+– Nd7 (18...Qg5 19.Bc6 Bh5 20.Ne4 Ne4 21.f3+–) 19.Nge4 (19.Nce4?! f6=) 19...Be4 20.Ne4 f5 21.Qf3 g6 22.Ng5 Ke7 (22...Qd5 23.Qf4+–) 23.Qc6 Qd2 (23...Qb6 24.Qd5 Qf6+–) 24.Rad1 Rac8 25.Qe6 (25.Qe6 Kd8 26.Rd2 Rh7 27.Nh7 Rc7 28.Rb1 Rb7 29.Rb7 g5 30.Qd7) 1–0. b4_Bb2 (1710) – alberto20161020100 (1725), lichess.org, 2019.

4.a4 a6

5.Nc3 d4= 6.Ne4 Qb4 (6...Qd5 7.d3 e5 8.Nf3=+) 7.Ba3 Qa4 8.Be7 (better 8.Nc5!? Qb5 9.Nf3+=) 8...Qb5=+ 9.Bf8 Kf8 10.Qb1 Qd5 (10...Qb1 11.Rb1 b5 12.Nf3=+) 11.Ng3 (11.c4!? Qc6 12.Nf3=) 11...Bc6 (11...b5!? 12.e3 Nc6=+) 12.Qb4 Ne7 13.Ra5?? (13.Nf3!?=) 13...b5 (better 13...Bb5!? 14.Ra1 Nbc6–+) 14.Nf3=+ Bb7 15.Qd4 (15.Nd4?? c5 16.Ne6 Qe6 17.Qc5 Nd7–+) 15...f6 (15...Qd4 16.Nd4 Nbc6 17.Nc6 Nc6 18.Ra2=+) 16.Qd5 Nd5 17.e3 Nb4 (17...Nc6 18.Ra1=) 18.c3 N4c6 19.Ra1 Nd7 20.Bd3 (20.d4 Kf7+=) 20...Nce5 21.Ne5 (21.Be2 h5 22.h4 Nf3 23.gf3 Kf7=) 21...Ne5 22.Be4 Bc6 (22...Be4 23.Ne4 a5 24.d4=) 23.Bc6 Nc6 24.Ke2 Ne5 (24...Kf7 25.Rhb1=) 25.Rhb1 (better 25.Ra2 Nc6 26.Rha1+=) 25...c5?? (better 25...Kf7+=) 26.Ne4 (26.Rb5! h5+–) 26...c4 27.Nc5 (27.Rb5 Ke7 28.Rc5 Rhc8 29.Rc8 Rc8 30.Ra6 Rc7+–) 27...Nd3 (27...Ke7+–) 28.Nd3 (better 28.Rb5! Nc5 29.Rc5+–) 28...cd3+– 29.Kd3 Ke7 30.f4 Rhb8 31.g4 a5 Black plans b4 32.h4 b4? (better 32...Kd6!?+–) 33.cb4+– ab4 (better 33...a4+–) 34.Rb4?? (34.Ra8 Ra8 35.Rb4 Ra7+–) 34...Ra1 (better 34...Rd8 35.Ke4 Ra1–+) 35.Rb8+– Ra3? (35...Rh1 36.h5 Rh2+–) 36.Ke2 (36.Ke4 Ra2 37.d4 Kf7 38.Rb7 Kg8+–) 36...Ra6 37.Rb7 Kf8 38.g5 (38.e4 Ra3 39.g5 h6+–) 38...fg5 (38...h6 39.g6 Ra5 40.Rb8 Ke7 41.Rg8+–) 39.hg5 (39.fg5 h5+–) 39...h6 (39...Ra2 40.Rb6+–) 40.gh6 gh6 41.Kf3 h5 (41...Ra5 42.d4 Ke8 43.e4 Ra3 44.Kg4+–) 42.d4 1–0. invictus31 (1635) – FallingFlying (1630), lichess.org, 2020.

5.e3 ab5 6.ab5 Ra1 7.Ba1 Qb6 8.c4 (8.Bd4!? Qd6 9.f4+=) 8...dc4=+ 9.Bc4 e6 (9...Bb5!? 10.Bd4 Qc6 11.Bb5 Qb5=+) 10.Qb3 Nf6 11.Nf3 Be7 12.0–0 0–0 13.Nc3 c6 14.Bb2 cb5 15.Nb5 Nc6 16.Nbd4 Qb3 17.Bb3 Nd4 18.Bd4 Bc6 19.Ra1 Rd8 (19...Nd7 20.Ne5=) 20.Ne5+= Bd5 21.Bd5 Nd5 (worse 21...ed5 22.Ra7 Rb8 23.Nd3+–; worse 21...Rd5 22.Ra7 Rb5 23.Ra8 Bf8 24.Kf1+–) 22.Rb1 f6 23.Nf3 e5 24.Ba1 b6 25.d4 (25.Kf1 e4 26.Nd4 g6=) 25...e4=+ 26.Nd2 Rc8 (better 26...f5!?=+) 27.Ne4+= Rc2 28.g3?? (better 28.Ng3+–) 28...f5–/+ 29.Rb5 fe4 30.Rd5 Rc1 31.Kg2 Ra1 32.Re5 Bf6 33.Re4 b5 34.Re8 Kf7 35.Rb8 Rb1 36.f4 b4 37.Kf3 b3 38.Ke4 b2 39.Rb7 Be7 40.d5 (better 40.Kd5!?–/+) 40...Ke8–+ 41.Kf5 Rf1?? (better 41...Kd8 42.Ke6 Ba3–+) 42.Rb2+– Rd1 (42...Ra1!?+–) 43.Ke6+– Ra1 (better 43...Re1 44.Rb3 Bd8+–) 44.Rb8 Bd8 (44...Bd8 45.d6 Ra6+–). RichardSommer (2025) – Katahaganalases (2050), lichess.org, 2020.

4.e3 e5

5.c4 dc4 6.Bc4 Qg6 (6...Be6 7.Be6 Qe6 8.Nf3=) 7.Bf1 (better 7.Be5 Qg2 8.Qf3 Qf3 9.Nf3+=) 7...Bb5?? (better 7...Bd6=) 8.Bb5+– c6 9.Bf1 Nf6 (9...Nd7 10.d4 Rd8 11.Qb3+–) 10.Nc3 (better 10.Nf3!? Nbd7 11.Ne5 Ne5 12.Be5 Nd7+–) 10...Bd6 11.Nf3 Nbd7 12.g3 Ng4 13.Bg2 0–0–0 14.0–0 e4?! (14...Nc5+–) 15.Nh4 Qe6 16.Ne4 f5 (16...Be7 17.f4 Bf6+–) 17.Nd6 Qd6 18.Nf5 Qb4 (18...Qe6 19.Qg4 Rhf8 20.Bh3+–) 19.Bg7 (better 19.Bc3 Ne3 20.fe3 Qa3+–) 19...Rhg8 (19...Rhf8 20.Bf8 Rf8+–) 20.Qg4 (better 20.Rb1 Qa3 21.Qg4+–) 20...Qg4= 21.Ne7 Kb8 (better 21...Kc7 22.Bh6 Rgf8=) 22.Ng8?? (better 22.Bh6+=) 22...Qg7–+ 23.Ne7 Qe7 24.Rfc1 Nb6 25.a4? (25.d4 Rf8–+) 25...a5 (better 25...Rd2!? 26.Rf1–+) 26.Rab1 (better 26.d4–+) 26...Na4?? (better 26...Ka7 27.Rc2 Rd7–+) 27.Bc6=+ Rd2 28.Rb7 Qb7 29.Bb7 Kb7 30.Kg2?? (better 30.Ra1!? Nc3 31.Ra5=) 30...Rb2 (30...Nb2!? 31.Ra1 Nd1 32.Ra5 Ne3 33.Kf3–+) 31.Rc4 (31.Ra1!? Rb4 32.f4–/+) 31...Rb4–+ 32.Rc5?? (better 32.Rc1–+) 32...Nb6 (better 32...Nc5 33.Kf3 a4–+) 33.Ra5+= Re4 34.Rh5 Re7 35.f4 Nd7 36.Re5?? (better 36.Kf3+=) 36...Re5 (better 36...Ne5 37.fe5 Kc6–+) 37.fe5–/+ Ne5 38.h3 (38.Kh3 Kc7=+) 38...Kc7 (38...Kc6 39.g4–/+) 39.g4 Kd7 40.Kg3 Ke6 41.Kf4 Kf6 (41...h6 42.h4–+) 42.h4 (better 42.g5!? Ke6 43.h4=) 42...Ng6–/+ 43.Kg3 Ne5 (43...Ke5 44.g5–/+) 44.Kf4 Nd3 45.Ke4 (45.Kf3–/+) 45...Nf2 (better 45...Ne1!?–+) 46.Kf4 h6 (46...Kg7 47.e4=) 47.e4 (47.e4 Ke6 48.g5=). aravind555 – Vlastimil, lichess.org, 2017.

5.Nf3 e4 6.Ne5 f6?? (better 6...Bf5 7.f4 f6=+) 7.Qh5+– (7.Nd7?! Nd7 8.c4 dc4 9.Bc4 f5=) 7...g6 8.Ng6! hg6 9.Qh8 Qe6 10.Be2 Qf7 11.0–0 Bg7 12.Qh7 Bf5 13.c4 Nd7? (13...dc4 14.Bc4) 14.cd5?? (better 14.Qh4 dc4 15.Rc1+–) 14...0–0–0?? (14...Nh6 15.Ba3 g5 16.Bh5 Bh7 17.Bf7 Nf7 18.Nc3–/+) 15.Nc3?? (15.d6 cd6 16.Rc1 Kb8+–) 15...Nf8?? (better 15...Nh6 16.d6 Nf8=+) 16.Qh4+– g5 (16...Ne7 17.f3 (17.Ne4?! g5 18.Nd6 Rd6+–) 17...Nd5 18.Ne4+–) 17.Qh3 (better 17.Qg3+–) 17…Bh3–+ (17...Bh3 18.gh3 f5–+) 0–1. Abdullaevich (1745) – Rintin (1760), lichess.org, 2019.

3.b5 Nd7

4.Ba3 Qb6 5.e3 e5 6.Bf8 Nf8 7.a4 Nf6 8.Nf3 Bg4 9.Be2 Ng6 10.0–0 0–0 11.d4 e4 12.a5 Qe6 13.Nfd2 a6 14.c4 Be2 15.Qe2 dc4 16.ba6 Ra6 17.Nc3 Rfa8 18.Qc4 Qc4 19.Nc4 b6 20.Rfb1 h6 21.Ra3 ba5 22.Rb7 Rc6 23.Nd2 Raa6 24.g3 Rab6 25.Ra7 Ra6 26.Ra6 Ra6 27.Nce4 Nd7 28.Nb3+/– Ne7 29.Ra5 Ra5 30.Na5 f5 31.Nc3 Kf7 32.f3 c6 33.e4+– fe4 34.fe4 Ke6 35.Kf2 Nf6 36.Kf3 g5 37.Na4 Nd7 38.Nb7 h5 39.g4 hg4 40.Kg4 Nf6 41.Kf3 g4 42.Kf4 Ng6 43.Ke3 Nh4 44.Nac5 Ke7 45.Na5 Nf3 46.Nc6 Kf7 47.Kf2 Nh2 48.Ne5 Ke7 49.Kg2 Kd6 50.Nc4 Kc6 51.e5 Ne8 52.Kh2 Kd5 53.Nb6 Kd4 54.Nbd7 Kd5 55.Kg3 Nd6 56.Kg4 Kc6 57.Kf4 Kc7 58.Nf6 Nb5 59.Ne6 Kc8 60.Ke4 Nc3 61.Kd4 Ne2 62.Kc4 Ng1 63.Nd4 Kd8 (If Black now only could play Ne2...) 64.Nc6 (64...Kc7 65.e6 Kc6 66.e7 Kb6 67.e8Q Kb7 68.Qd7 Kb6 69.Nd5 Ka6 70.Qc7 Nf3 71.Qb6#) 1–0. Rosner,Dirk – Ritz,Olaf, DESC, 2000.

4.a4 e5 5.e3 Qg6 6.Nf3 e4 7.Nd4 Bd6 8.c4 (better is 8.a5!?=+) 8...dc4–/+ 9.Qc2 (9.Ba3!?–/+) 9...Ne5–+ 10.f4?? (10.g3 Nd3 11.Bd3 cd3 12.Qd1–+) 10...Nd3 11.Bd3 (11.Kd1 Bg4 12.Ne2 Nf2 13.Ke1 Nh1 14.Nd4–+) 11...cd3 (11...ed3?! 12.Qd1 Qg2 13.Qf3 Qf3 14.Nf3–+) 12.Qd1 (12...Qg2 13.Qh5–+; 12.Qd3 ed3 13.0–0 Nf6–+). chessleon – samragim, net–chess.com, 2006.

4.e3 e5

5.c4 Ngf6 6.Nf3 e4 7.Nd4 Ne5 (7...dc4 8.Na3=+) 8.Qc2 (8.Ba3 Qd8 9.Bf8 Rf8 10.cd5 Nd5=) 8...c6 (8...dc4 9.Bc4 Qb4 10.Be2 Nd3 11.Bd3 ed3 12.Qc1=) 9.Be2 (9.bc6 Nc6 10.cd5 Nb4 11.Qa4 Bd7+=) 9...Bg4 (9...dc4 10.bc6 bc6–/+) 10.0–0? (better is 10.bc6!? bc6 11.f3 ef3 12.gf3=) 10...Be2–/+ 11.Ne2 Nc4 (11...dc4?! 12.bc6 b5 13.Nd4=+) 12.bc6 bc6 (12...Ng4 13.Nf4 bc6 14.Bd4–/+) 13.Bf6 Qf6 14.Nbc3 Ne5 (14...Be7 15.Nd4–/+) 15.Nf4 (15.Nd4–/+) 15...Bb4 (15...Bd6 16.Rfb1–/+) 16.Qa4? (better is 16.Ncd5!? cd5 17.Qa4 Qc6 18.Qb4=) 16...Bc3–/+ 17.Nd5 Nf3 18.gf3 Qg5 19.Kh1+= Qd5 20.dc3 ef3=+ 21.Rad1 Qe6 22.Rd4 Qg6?? 23.Rg1+/– Qf6 24.Rf4 Qc3 25.Rg7 f5 26.Rg5 h6= 27.Rg6 Qc1+/– 28.Rg1 Qc5 29.Rf3 Qd5= 30.Rgg3 Rf8 31.Kg1 Qe4 32.Qe4 fe4+/– 33.Rf8 Kf8 34.Rh3 Kg7=+ 35.Rh4 Re8 36.Rf4 Re5=+ 37.Kf1 c5 38.Ke2 c4 39.Kd2 Ra5 40.Kc3 Ra2 41.Kc4 a5 42.Kb3 Re2 43.Ka4 Ra2= 44.Kb3 Re2 45.Kc3+= a4 46.Re4 a3 47.Ra4 Rf2 48.Ra3 Rh2 49.Ra4 Kf6 50.Rf4 Ke5 51.Kd3 h5 52.Re4 Kd6 53.Rd4 Ke5 54.Re4 Kd6 55.Rd4 Ke5 56.Re4 Kd6 (56...Kf6 57.Rf4 Kg5 58.Rf8=) ½–½. Biagini – Fritz, Amichevole, 1993.

5.c4 Ngf6 6.Nf3 Be7 7.d4 Qb4?? (better 7...dc4 8.Ba3 Qe6 9.Be7 Qe7 10.Bc4 ed4 11.Qd4 Nb6=+) 8.Bc3+– Qd6 9.de5 Qc5 10.ef6 Nf6 11.Qd4 Qc4 (11...Be6+–) 12.Bc4 dc4 13.Nbd2 Bd7 14.Qc4 (14.Qe5 Be6 15.Ng5 Bd6+–) 14...0–0–0 15.0–0 b6 16.a4 (better 16.Ng5 Rhf8+–) 16...Be6 17.Qe2 Kb8 18.Rfd1 (18.Ne5 Ka8 19.a5 Nd5 20.ab6 cb6+–) 18...Nd5 19.Bg7 Rhg8 1–0. Darkseid (1800) – Kenzq (1650), ChessWorld.net, 2006.

5.d4 ed4 6.Bd4= Ngf6 (6...Nh6 7.Bd3=) 7.Nf3 Be7 8.c4 dc4 (8...0–0 9.Nbd2=) 9.Bc4 Nb6 (9...0–0 10.0–0=) 10.Bb3 (10.Bd3 Be6=) 10...a5 (10...0–0 11.Qc2=) 11.Ne5 (11.0–0 0–0=) 11...0–0 12.0–0 (12...Be6 13.Qc2=; 12.Nc3 a4 13.Bc2 Nbd5=). chessleon – samragim, net–chess.com, 2006.

5.d4 Ngf6 6.Ba3 Qe6 7.Bf8 Nf8 8.c4 =.

5.Nf3 e4 6.Nd4 Qg6 7.Nc3 (7.a4 Bd6=+) 7...Ngf6 8.f3 (8.Nce2 Bd6=+) 8...Bc5 (8...Bd6 9.g3=+) 9.Nde2 (9.Nce2 Ne5=+) 9...Bd6 10.fe4 (10.a4 ef3 11.gf3 Ne5–/+) 10...de4 11.g3 (11.Nf4 Qg5=+) 11...Ne5–/+ 12.Bg2 (12.Nf4 Qg5–/+) 12...Bg4 13.Rg1? (better is 13.Nf4 Qg5 14.Qb1 Nf3 15.Bf3 Bf3 16.Rf1–+) 13…Nf3–+ (14.Bf3 ef3–+ (14...Bf3?! 15.d3–+)) 0–1. moover – Apocalypse, internet, 2005.

3.b5 e5

4.a3 c6 5.e3 Nf6 6.h3 (6.Nf3 e4 7.Ne5 a6 8.ba6 Na6=+) 6...Be6 (6...Nbd7 7.d4=+) 7.Nf3 Nbd7 8.Ng5 (8.Be2 Be7=+) 8...Be7 (8...Bf5 9.d4=+) 9.Ne6 Qe6 10.Be2 (10.Nc3 d4 11.bc6 bc6=+) 10...0–0 11.0–0 (11.d4 e4=+) 11...Rfe8 (11...cb5 12.Bb5 Qb6 13.a4=+) 12.bc6 (12.f4 Bd6 13.fe5 Be5 14.Be5 Ne5 15.bc6 Nc6=+) 12...bc6 13.d3 (13.Nc3 Reb8 14.Rb1 Rb7=+) 13...Rab8–/+ 14.Bc3 c5 (14...Nc5 15.Bb4–/+) 15.Nd2 d4 16.Ba5 Nd5 (16...Bd8 17.Bd8 Red8 18.Bf3=+) 17.ed4 (17.Bg4 f5 18.Bf5 Qf5=) 17...ed4 (better 17...cd4 18.Bg4 f5=+) 18.Nf3?? (18.Re1 Ne5=+) 18...Bd6?? (better 18...Bd8 19.Qd2 Ba5 20.Qa5 Qe2 21.Nd4 cd4 22.Qd5 Nb6 23.Qd4 Qc2–+) 19.Re1–/+ Qg6 (19...Nf4 20.Bf1 Qg6 21.Re8 Re8 22.g3=+) 20.Bf1 (20.Nh4 Qf6 21.Bg4 Re1 22.Be1 Ne5–/+) 20...Nf4 (20...Re1 21.Ne1 Bf4 22.Be2–/+) 21.Re8=+ Re8 22.Rb1?? (better 22.g3=+) 22…Nh3–+ (22...Nh3 23.Kh1 Nf2 24.Kg1 Nd1 25.Rd1 Re3–+) 0–1. starch123 – phs2014, gameknot.com, 2014.

4.Ba3 Qe6 5.Bf8 Kf8 6.e3 Ne7 (6...c5 7.bc6 Nc6 8.Nf3=+) 7.Be2 (7.Nf3 Kg8=) 7...a5 (7...Qg6 8.g3=+) 8.a4 (8.d4 Kg8=) 8...c5 (8...Qg6 9.g3=+) 9.Nc3 (9.d4 Nd7=) 9...b6 (9...Kg8 10.d4=) 10.d3 Bb7 (10...Kg8 11.d4 cd4 12.ed4=) 11.Nf3 (11.Bf3 Kg8=) 11...Nd7 12.0–0 (12.d4 cd4 13.ed4 Rc8=) 12...Rd8 (12...d4 13.Na2=) 13.Nb1 (13.d4 e4 14.Nd2 Kg8=) 13...e4 (13...d4 14.Qd2=) 14.Ne1 (14.Nfd2 Kg8=) 14...f5 (14...Kg8 15.d4=) 15.Nd2 (15.d4 Kf7=) 15...Nf6 (15...Kf7 16.Bh5 g6 17.Be2=) 16.c3 Kf7 17.Qb3 (17.d4 c4=) 17...g5 (17...Rhf8 18.d4=) 18.d4 c4 19.Qd1 g4 (19...f4 20.Nc2=) 20.g3 (20.Nc2!?=) 20...h5 21.Ng2 (21.Qc2 h4=+) 21...Ng6 22.f4? (better is 22.Rb1=+) 22...gf3 (22...ef3 23.Bf3 gf3 24.Qf3–+) 23.Bf3 h4 24.Be2 hg3 25.hg3 Rdg8 26.Kf2 Qd6 27.Rh1 Nh4 28.Nf4= White gets strong initiative 28...Nf3 29.Bf3+= ef3 30.Qf3 Ng4 31.Ke2+/– Qe7 32.Ng2 Kf6 33.Rh8+– Rh8 34.Rf1 Nh6 35.Qf4 Qh7?? 36.Nh4 Rf8?? 37.Qe5 Kg5 38.Ndf3 Kh5 39.Ng2 Kg6+– 40.Nf4 (40...Kf7 41.Qe6 Kg7 42.Ng5+–) 1–0. Fritz,Harry – Pickert, corr, 1966.

4.a4 Qb4 5.Ba3 (better 5.Be5 Qe7 6.Nf3+–) 5...Qa4?? (better 5...Qa5=) 6.c3?? (better 6.Bf8 Qg4 7.Ba3+–) 6...Qd1 7.Kd1 Ba3 8.Ra3 Nf6 9.Nf3 Nbd7 10.e3 e4 11.Nd4 Ne5 (11...a5 12.ba6 ba6 13.Be2–+) 12.h3 Be6 (12...c5 13.bc6 bc6 14.f4 ef3 15.gf3–/+) 13.g4 (13.f4 ef3! 14.gf3 Bd7–/+) 13...Nf3 (better 13...c5!? 14.bc6 bc6–+) 14.Nf3=+ ef3 15.g5 (better 15.d3!?=+) 15...Ne4–/+ 16.Ke1 0–0–0 (16...h6 17.gh6 Rh6 18.d4–/+) 17.h4 (17.Ra7 Kd7 (worse 17...Ng5 18.Rg1 Kb8 19.Ra3=) 18.d3 Nd6=+) 17...Bf5 (17...Kb8 18.d3 Nd6 19.d4–/+) 18.Ra7 Nc5 (18...Nd6 19.Bh3 h6 20.Bf5 Nf5 21.g6=+) 19.Ra8 (better 19.d4!? Kb8 20.Ra3 Bb1 21.dc5=) 19...Kd7=+ 20.Ra5?? (better 20.Rd8 Rd8 21.d4 Nd3 22.Bd3 Bd3 23.Kd2 Bb5 24.Na3–/+) 20...Bb1–+ 21.Bh3 (21.d4 Ne4 22.Ra1 Nc3–+) 21...Ke7 (better 21...Kd6 22.d4 Nb3–+) 22.Rg1 (22.d4 Nb3 23.Ra3–+) 22...Ra8 23.Ra8 (23.d4 Nb3 24.Bg2 Ra5 25.Bf3–+) 23...Ra8 24.d4 (24.d3 Bd3 25.Bg4 Ra1 26.Kd2 Ra2 27.Ke1 Re2 28.Kd1 Bc2 29.Kc1 Nd3) 24...Nd3 (24...Nb3 25.Bg4 Be4 26.Bf3 Bf3 27.c4 Ra1) 25.Kd2 Ra2 26.Kd1 Nf2 (26...Rf2 27.e4 Bc2) 27.Kc1–+ Bd3 (better 27...Nh3 28.Rf1 Be4 29.Rf3 Bf3–+) 28.Rg3 Rc2 29.Kb1 Rc3 (29...Ne4 30.Ka1 Nc3 31.Rg2 fg2 32.Bg2 Ra2) 30.Kb2 Nd1 31.Ka2 Rc2 32.Kb3 Rb2 (better 32...Rc4 33.Bf5 Bf5–+) 33.Ka4 (33.Ka3 Bc2 34.Rg1–+) 33...Bc2 34.Ka3 (34.Ka5 Ra2 35.Kb4 b6 36.Rf3 Ra4) 34...f2 (34...Rb3 35.Ka2 Nc3 36.Ka1 Rb1) 35.Rf3 (35.e4 Rb5 36.Bf1 Ra5 37.Kb4 Ra4 38.Kc5 de4 39.h5–+) 35...Rb5 (35...Rb3 36.Ka2 Nc3 37.Ka1 Rb1) 36.Bf1 Rb3 37.Ka2 (37.Ka4 b6 38.Rf7 Kf7 39.g6 hg6 40.e4 Nc3) 37...Nc3 38.Ka1 Rb1 0–1. AleksandrNekhoroshik (1635) – djghjcjndtn_–01 (1625), lichess.org, 2020.

4.a4 c6 5.e3 Bd7 6.Nf3 f6 7.c4 Be7 8.Be2 (8.Nc3 dc4 9.Bc4 Qb4 10.Bg8 Rg8+= (10...Qb2? 11.Bb3 Bb4 12.Ne4+–)) 8...Nh6 (8...dc4 9.Na3=+) 9.0–0 (9.Ba3 Qe6 10.Be7 Qe7 11.cd5 cd5+=) 9...Nf5 (9...e4 10.Nd4 dc4 11.Na3=) 10.Qb3 (10.d4 e4 11.Ba3+=) 10...0–0 (10...e4!? 11.Ne1 Be6=) 11.Nc3 (11.cd5 cd5 12.e4+–) 11...d4?? (11...Be6 12.g4 Nh6 13.bc6 bc6 14.cd5 cd5 15.Ba3=) 12.Ne4 (better 12.c5 Be6 13.Bc4+– (13.cd6?! Bb3 14.de7 Re8+–)) 12...Qc7 (better 12...Qe6!?+=) 13.ed4+– ed4 14.Nd4 Nd4 15.Bd4 Kh8 (15...c5 16.Bb2+–) 16.Bc5 (16.Qe3 b6+–) 16...Bf5 (16...Bc5!? 17.Nc5 cb5+–) 17.Be7 Qe7 18.Ng3 Be6 19.d4 cb5 (19...Re8 20.Rfe1 Qd6 21.Bg4+–) 20.ab5 Nd7 21.Bf3 Rab8? (better 21...Qd6 22.Qc3 Qc7+–) 22.Ra7 Nb6 23.Rb7?? (better 23.Re1 Qd7 24.d5+–) 23...Rb7+– 24.Bb7 (24.Re1 Rc7 25.d5 Nc4 26.b6=) 24...Bc4= 25.Qc3? (better 25.Qf3 Bf1 26.Nf1=) 25...Bf1–+ 26.Kf1? (26.Qc5 Re8 27.Be4 Qc5 28.dc5 Bb5 29.cb6–+) 26...Re8 (26...Qb7 27.Nf5–+) 27.Qc1?? (27.Bc6 Rd8+=) 27...Na4 (27...Qb7 28.Qc6 Qe7 29.Kg1 Qe1 30.Nf1–+) 28.h3?? (28.Bc6 Rd8+=) 28...Nb6 (better 28...Qb7 29.Qc6 Qc6 30.bc6 Nc3–+) 29.Bc6+= h6?? (better 29...Rd8+=) 30.Be8+– Qe8 31.Qe3 (31.Qc6 Qd8 32.Nf5 Kh7+–) 31...Qb8? (31...Qb5!? 32.Kg1 Qd7+–) 32.Ke2 (better 32.Qe6!? Qd8 33.Nf5 Qd5 34.Qd5 Nd5+–) 32...Nc4 33.Kf3?? (better 33.Qb3 Nd6 34.b6+–) 33...Ne3–+ 34.fe3 Qb5 35.Kf2 Qd7 36.Ne4 (36.Ne2 Qf5 37.Kg1 Kg8–+) 36...g5 (36...Qf5 37.Ke2 Qe4 38.Kf2–+) 37.Kf3 (37.g4 h5 38.Nc5 Qc8–+) 37...Kg7 (better 37...Qf5 38.Kg3 Qe4 39.Kf2–+) 38.Nf6 (38.Nd2–+) 38...Kf6 39.g4 Qa4 40.Kf2 Qa8 41.Ke2 Qe4 (41...Qe4 42.Kf2 Qc2 43.Kf1 Qd2–+) 0–1. RichardSommer (1940) – R_grey09 (1900), lichess.org, 2020.

4.a4 e4 5.Ba3 Qb6 (5...Qe5 6.Ra2=+) 6.Bf8= Kf8 7.e3 Nf6 8.c4 (8.Nc3 Kg8=) 8...d4=+ 9.ed4 (9.a5 Qc5=) 9...Qd4 10.Nc3 e3?? (better 10...Nbd7=+) 11.Nge2?? (better 11.fe3 Qc5 12.Nf3+–) 11…ef2 0–1. AleksandrNekhoroshik (1740) – Wolkhard (1750), lichess.org, 2021.

4.a4 Be7 5.e3 Nf6 6.Be2 c5 (6...Nbd7 7.Nf3+=) 7.d3 (7.Nf3 e4 8.Ne5 Nbd7+=) 7...a6 (7...Be6 8.Nf3 d4 9.0–0+=) 8.c4 (8.Nf3 d4=) 8...d4 (8...ab5 9.ab5 Ra1 10.Ba1+=) 9.e4 (9.Nf3 ab5 10.ab5 Ra1 11.Ba1 0–0+=) 9...Qc7 (9...Nbd7 10.Nf3+=) 10.Nf3 ab5 11.ab5 Ra1 12.Ba1 0–0 13.0–0 h6 14.Bb2 Nh7 (14...Be6 15.Bc1+=) 15.Bc1 (15.Qc2 f5=) 15...f5 16.Nbd2 f4 (16...Nf6 17.Re1=) 17.h3 (17.Qc2 Nf6=) 17...Qd6 (17...Be6 18.Bb2=) 18.Nh2 (18.Bb2 Be6=) 18...Be6 (18...Nf6 19.Nhf3=) 19.Bg4 Nd7 20.Be6 Qe6 21.Qg4 (21.Qa4 Ng5=) 21...Qd6 (21...Qg4 22.Ng4 h5 23.Nh2+=) 22.Qd1 (22.Ba3 Nhf6 23.Qf3 Qe6=) 22...Ra8 23.Nb3 (23.Nhf3 Ng5=) 23...Ng5 (23...Ra2 24.Bd2+=) 24.Kh1 (24.Nf3 Qg6 25.Ng5 Qg5=) 24...Nf6 (24...Qg6 25.Qg4 Qe6 26.Qe2+=) 25.Nd2 (25.Nf3 Nf7=) 25...h5 (25...Ra2 26.Nhf3=) 26.Ndf3 (26.Nhf3 Nf3 27.Qf3 g5+=) 26...Nf3 (26...Nf7 27.Bb2=) 27.Nf3 Nh7 (27...Nd7 28.Nd2 Qg6 29.Kh2=) 28.Nh2 (28.Qe2 Nf6=) 28...g6 29.g3 (29.Qe2 Ng5=) 29...fg3 (29...Ng5 30.h4 Ne6 31.Nf3=) 30.fg3 Ra1 (30...Qe6 31.g4=) 31.h4 (31.Qc2 Bg5=) 31...Qe6 (31...Nf6 32.Qd2=) 32.Qf3 Nf6 33.Bg5 Rf1 34.Qf1 Ne4 (better is 34...Kg7=) 35.de4+– Bg5 36.hg5 b6 37.Kg2 Qe7 38.Nf3 Qe6 (better is 38...Kg7+–) 39.Nh2 (39.Kf2 Kg7+–) 39...Kg7 (better is 39...Qe7=) 40.Qd3 (40.g4 Qe7 41.Qc1 Kg8+–) 40...Qe7+/– 41.Nf3 Qe6 (41...Qc7 42.Qa3 Qb7 43.Kf2+–) 42.Kh2 (42.Kf2 Qd6+–) 42...Qe7 ½–½. Mauron,Regis – Duval,Dominique (1870), Montigny le Bretonneux Noel op, 2008.

4.a4 f6 5.e3 Bf5 6.c4 d4 (6...Ne7 7.d4=) 7.Nf3 (7.Qf3 Bc8+=) 7...c5 8.bc6 Nc6 9.Ba3 Qd7 10.Bf8 Kf8 11.Qb3 Nge7 12.Qb5 a6 13.Qb6 Kf7 14.Na3 Rhd8 Black prepares d3 15.Nc2?? (better 15.c5=+) 15...Bc2–+ 16.Be2 d3 17.Bd1 e4 18.Nd4 (18.Ng1 Ne5 19.Qb4 Rac8–+) 18...Nd4 19.ed4 Qd4 20.Qd4 Rd4 21.0–0 Bd1 22.Rad1 Rc4 23.f3 (23.Rb1 b5 24.ab5 ab5–+) 23...ef3 (better 23...Ra4 24.fe4 Re4 25.Rf3–+) 24.Rf3 Rd8 25.Rb1 Ng6 (25...Rd7 26.Rb3–+) 26.Rb7 Kg8 27.Rb6 (27.Rf1 Ra4 28.Rc1 Nh4–+) 27...Ne5 28.Re3 (28.Rf1 Ra4 29.Rfb1 Ra3–+) 28...Rc1 29.Kf2 Rd1 (better 29...Ng4 30.Kf3 Nh2 31.Kf2 Ng4 32.Kf3 Ne3 33.Ke3 Re1 34.Kf3–+) 30.Ra6 (30.Rb2 Ng4 31.Kf3 Nh2 32.Kf4–+) 30...Rd2 31.Kg3 Re2 (better 31...Rg2! 32.Kg2 d2 33.Rg3–+) 32.Re2 de2 33.Kf2 Rd2 34.Ra7 (34.Ra8 Kf7 35.Ke1 Nd3 36.Kd2 e1Q 37.Kd3 Qf1 38.Kc3 Qg2 39.Ra7 Ke6 40.Ra6 Ke5 41.Rb6 Qh2 42.a5–+) 34...Nd3 35.Kg3 (35.Ke3 e1Q 36.Kd4 Qe5 37.Kc4 Qc5 38.Kb3 Qb4) 35…e1Q (35...e1Q 36.Kf3 Qf2 37.Kg4 Qf4 38.Kh5 g6) 0–1. RichardSommer (1970) – surgeon56 (2030), lichess.org, 2020.

4.a4 Nf6 5.Nf3 Be7 6.Be5+= Qb6 (6...Qd8 7.e3+=) 7.Bd4 (7.Nc3 Nbd7 8.a5 Qc5+–) 7...Bc5 (7...Qe6 8.e3+=) 8.Bc5 Qc5 9.c3 0–0 10.d4 Qc4?? (better 10...Qe7+=) 11.e3 1–0. AleksandrNekhoroshik (1640) – Tough_One5 (1690), lichess.org, 2020.

4.e3 a6 5.a4 ab5 6.ab5 Ra1 7.Ba1 c6 8.Nf3 e4 9.Be5 Qe6 (9...Qg6 10.Bb8 ef3 11.gf3+=) 10.Bb8+– cb5?? (better 10...ef3 11.gf3 Bd6 12.Bd6 Qd6+=) 11.Bb5 Bd7 (11...Kd8 12.Nd4 Qg4 13.Ne2+–) 12.Nd4 Qb6 (12...Qg6 13.Bd7 Kd7 14.Qe2+–) 13.Bd7 Kd7 14.Qg4 Ke8 (14...Kd8 15.Nc3 Nf6 16.Qg3+–) 15.Qc8 Ke7 (15...Qd8 16.Qb7 Qd7+–) 16.Bc7 Qb1 17.Ke2 Qh1 18.Qd8 1–0. DEFFM – GuestNLBC, freechess.org, 2019.

4.e3 c6 5.Nc3 (5.d4 ed4 6.Bd4 Nf6=) 5...Be7 6.a4 Qg6 (6...Nf6 7.Nf3=+) 7.Nge2 Bg4 8.f3 (8.bc6!? bc6 9.d4 ed4 10.ed4=) 8...Bh4–/+ 9.Ng3 Bf5 10.Bd3 Bg3 11.hg3 Qg3 12.Kf1 Bd3 13.cd3 Nd7 14.Ne2 Qg6 15.Qb3 (15.d4 e4–/+) 15...Ngf6 16.Ba3 c5 17.d4 0–0 (better is 17...cd4!? 18.ed4 e4–+) 18.dc5 Rfc8 19.d4 Re8 20.Rh3 ed4 21.Nd4 Ne5 22.Kf2? (22.Rd1 Rac8=+) 22...Nc4 (better is 22...Nd3 23.Kg1 Re3–+) 23.Rg3 Re3 (23...Qh5 24.Rh3 Qe5 25.Re1=+) 24.Qe3= Qg3 25.Kg3 Ne3 26.c6 bc6 27.Nc6 Nc2 28.Ra2 Na3 29.Ra3 Kf8 30.Re3 Nd7 (30...Nh5!? 31.Kf2 Nf4=) 31.Re7+/– Nc5 32.a5 Nb3 33.Kf4?? (33.b6 ab6 34.ab6 Nc5+–) 33...h6?? (better is 33...Na5 34.Rc7 Nc6 35.bc6 a5–/+) 34.Rd7 Nd2? (better is 34...d4!?+/–) 35.Rd5 (35.Na7?! Nb3 36.Ke5 Ke8+/–) 35...Nc4 36.Ke4 Na3?? (36...Re8 37.Kd4 Ne3 38.Rd7 Ng2 39.Ra7+–) 37.Kd4 (37.b6 ab6 38.ab6 Nc4+–) 37...g5? (37...Nc2 38.Kc5 Ne3+–) 38.Kc5 Re8 39.Rd8 (better is 39.b6!? ab6 40.ab6 Re1+–) 39...Rd8 40.Nd8 Ke8 41.Nc6 Kd7 42.Na7 Kc7 (42...Nb1 43.b6 Nc3+–) 43.b6 Kb7 44.Kb4 (better is 44.Nc6 Ka6 45.Nb4 Ka5 46.b7+–) 44...Nc2 45.Kc5?? (better is 45.Kc4+–) 45...Ne3?? (45...Na3 46.Nc6 Ka6 47.Nb4 Ka5+–) 46.Kb5 Nd5 47.a6 Kb8 48.Nc6 Kc8 49.b7 Kd7 50.b8Q Nc7 51.Kb6 Kd6 (51...Ne8 52.Qe5 Ng7 53.Qd5 Kc8 54.Qd8) 52.Qc7 Ke6 (52...Kd5 53.Kb5 Ke6 54.Qe7 Kd5 55.Qe5) 53.Qd8 (53.Qe5 Kd7 54.Qd5 Kc8 55.Qd8) 53...Kf5 (53...f6 54.Qe7 Kd5 55.Kb5 f5 56.Qe5) 54.Qd5 (54.Qd6 g4 55.Ne7 Kg5 56.g3 gf3 57.Qf4 Kh5 58.Qf5) 54...Kg6 55.Ne7 Kh5 (55...Kg7 56.a7 Kf6 57.Qd6 Kg7 58.a8Q f5 59.Qg8) 56.Qe5 Kh4 (56...f5 57.Qh2) 57.Qh2 1–0. Otte,Marco – Oorebeek,Erwin, Wag.Intrapid, 1997.

4.e3 d4 5.Ba3 Qb6 6.Bf8 Kf8 7.ed4 Qd4 8.c3 Qb6 9.Nf3 e4 10.Ng5 Bf5 (10...Qg6 11.h4 h6 12.Nh3=+) 11.Qa4 (11.Bc4 Nh6=) 11...Nf6 (11...Qg6 12.h4 h6 13.Nh3=+) 12.Qc4 Threatening mate: Qxf7 12...h6?? (better 12...Bg6=) 13.Qf7 1–0. aravind555 (1610) – am74 (1640), lichess.org, 2019.

4.e3 Nd7 5.Nf3 Ngf6 6.Be2 g6 7.0–0 Bg7 (7...e4 8.Nd4=) 8.c4 (8.Ba3 c5 9.bc6 Qc6+–) 8...c6 (8...e4 9.Nd4=) 9.a4 (9.cd5!? Nd5 10.Nc3 Nc3 11.Bc3+=) 9...e4 10.Nd4 (10.bc6 bc6 11.Nd4=) 10...Ne5 (10...c5 11.Nb3 Ng4 12.Bg4 Bb2 13.Bd7 Bd7 14.Ra2=+) 11.Qc2 (11.bc6 bc6 12.cd5 Nd5+–) 11...Neg4 (better 11...c5!? 12.Ba3 Nc4 (worse 12...dc4 13.Nc3=+) 13.Bc4 dc4 14.Qc4 Ng4–/+) 12.f4 (12.g3 c5 13.Ba3 dc4 14.Bc4 Bf8=) 12...ef3= 13.Nf3 Qe6?? (13...Bf5 14.c5 Qc7= (14...Bc2? 15.cd6 h5 16.Nd4+–)) 14.h3 Nh6 (14...Ne3 15.de3 Qe3 16.Kh1+–) 15.Ng5 Qd6 16.bc6 bc6? (better 16...Qc6 17.Qb3 d4+–) 17.cd5 cd5 18.Bb5 (better 18.Ba3!? Qb6 19.Nc3 a6+–) 18...Bd7 19.Bd7 Kd7 20.a5 Nf5? (better 20...Rhc8 21.Qd3 Rab8+–) 21.Nf7 Qg3 (21...Qa6 22.Nh8 Bh8 23.Qa4 Qc6 24.g4+–) 22.Nh8 (better 22.Be5!? Qh4 23.Nh8 Rc8+–) 22...Bh8 (22...Rh8 23.Nc3 Rb8 24.Rac1+–) 23.Qa4 Ke7 24.Qc6 Rb8 25.Ba3 Kf7 (25...Kd8 26.Qe6 Rb7 27.a6+–) 26.Nc3 Nh4 (26...Qe5+–) 27.Qd5 Kg7 28.Qc6 (better 28.Rf6 Qg2 29.Qg2 Ng2+–) 28...Kh6 (28...Qg2 29.Qg2 Ng2 30.Kg2+–) 29.Bd6 (29.Bd6 Rc8 30.Bg3 Rc6 31.Bh4+–) 1–0. Beljushina,Sonja (1635) – Shipitsina,Guzel, Championship Ufa, 2012.

4.e3 Bf5 5.Nf3= Nd7 6.c4 (6.d4 e4 7.Ba3 Qe6 8.Bf8 Nf8=) 6...Ngf6=+ 7.d4 (7.cd5 Nd5 8.d4 e4=+) 7...Ne4 (7...dc4 8.Bc3=+) 8.Qb3 (8.a3 dc4 9.Bc4 c5=) 8...Qb4 9.Nbd2 (9.Nfd2 Qb3 10.ab3 Bb4=) 9...ed4 (9...Bg4 10.a3 Qa5 11.Qc2=) 10.Bd4= Qa5 11.a3 Bg4 (12.Qb2 Be6 13.cd5 Bd5 14.Bg7 Bg7 15.Qg7 0–0–0+=; 11...Ndc5 12.Qa2=). Nemec,Zdenek – Volf,Vladislav, CSR CF, 1990.

4.e3 f6 (--> 1.b4 e5 2.Bb2 f6 3.b5 d5 4.e3 Qd6).

4.Nf3 Qb4 5.Be5+– Nf6 (5...Nd7 6.Bc7 d4 7.Qc1+–) 6.e3 (6.Bf6 gf6 7.e3 Be6+–) 6...Bd6 (6...Qe7 7.Nc3+–) 7.a3+– Qa5 8.Bd6 cd6 9.Be2 (9.Nd4 0–0+–) 9...0–0 10.0–0 (10.Nc3 Be6+–) 10...a6 (10...Re8 11.Nd4+–) 11.Nd4+– Bd7 (11...ab5 12.Nb5 Qb6 13.N1c3+–) 12.Nc3+– ab5 13.Ncb5 Bb5 (13...Ne4 14.c3+–) 14.Bb5 (14.Nb5 Ne4+–) 14...Nbd7 (14...Qc7 15.Nf5+–) 15.Bd7 Nd7 16.d3 Ne5 (16...Rfe8 17.Nf5 g6 18.Qg4+– (18.Nd6?! Re6=)) 17.f4 (17.Qb1!?+–) 17...Ng4?? (better 17...Nc6 18.Nf5 g6+–) 18.Qg4+– 1–0. Anonymous – Anonymous, lichess.org, 2020.

4.Nf3 Bd7 5.Be5 Qb6 6.a4 a6 (6...f6 7.Bf4+/–) 7.e3 ab5 8.ab5 (better is 8.Nc3!? Nf6 9.ab5+–) 8...Ra1+= 9.Ba1 Bb5 10.Bb5 Qb5 11.Nc3 Qc5 12.0–0 Nf6 13.Na4 Qb4 14.c3 (14.Bf6 Qa4 15.Be5 Na6+/–) 14...Qd6 15.Nd4 (15.Qb3 Qa6+=) 15...c6 16.Nf5 Qc7 17.Qf3 (17.d3 b5 18.Nb2 Nbd7=) 17...Nbd7 (17...b5 18.Nb2=+) 18.d4 (18.d3!?=) 18...g6 19.Nc5? (19.Ng3 h5=+) 19...Nc5 (better is 19...gf5 20.Qf5 Be7–+ (20...Nc5 21.Qf6 Rg8 22.dc5+/–; 20...Bc5?! 21.dc5 Rg8 22.c4–/+)) 20.dc5=+ gf5 21.c4 Be7 (21...Ng4 22.g3 Rg8 23.Bd4 dc4 24.Ra1–/+) 22.Bf6 (22.cd5!? cd5 23.Qf5=+) 22...Bf6–/+ 23.Qf5 Be7 24.cd5 cd5 25.Qd5 Rg8 (25...0–0 26.Rc1–+) 26.g3 (26.Ra1 Qc8 27.Qe4 Rg7–/+) 26...Qc8 (26...Qc5 27.Qb7 Kf8 28.Rd1–+) 27.e4 (27.Qh5 Rg7–/+) 27...Rg6 (better is 27...Bc5 28.Ra1 Kf8–+) 28.f4? (28.Qe5!?–/+) 28...Rh6 (better is 28...Qc5 29.Qc5 Bc5 30.Kg2–+) 29.Rf2? (better is 29.Rc1 b6 30.c6–+) 29...Bc5 30.Qe5 Kf8 (better is 30...Re6 31.Qh8 Kd7 32.Qh7 Bf2 33.Kf2 Qc2 34.Ke3 Kc6–+) 31.Qh8+– Ke7 32.Qc8 Bf2 33.Kf2 Rh2 34.Kf3 (34...Rh6 35.f5+–) 1–0. TIROLOCO – Robecop, Live Game Caissa's Web, 2004.

4.Nf3 g6?? 5.Be5+– (5.Ne5?! Bg7 6.d4 f6+–) 5...Qd7 6.Bh8 f6 7.e3 (7.Nc3 Bb4 8.Rb1 Bc3 9.dc3 a6+–) 7...c6 (7...h6 8.Nc3 c6 9.bc6 bc6 10.Nd4+–) 8.a4 (8.bc6 bc6 9.Bd3 Qe7+–) 8...Bc5 (8...h6+–) 9.c4 Qf5 10.Be2 Ne7 11.0–0 g5 (11...dc4 12.Bc4 cb5 13.ab5+–) 12.h3 (better 12.d4 Bb4+–) 12...Be6 (12...Ng6 13.d4 dc4 14.Nfd2+–) 13.Nd4 (better 13.d4 dc4 14.dc5 Nd7+–) 13...Bd4 14.ed4 Nd7 (14...Qf4 15.Bh5 Kd7 16.Re1 Qd4 17.Ra3+–) 15.Re1 0–0–0 (15...h6 16.Ra3 Qh7 17.Re3+–) 16.Bg4 Qg6 17.Re6 Nf5 (17...Rh8 18.Re7 f5 19.cd5 fg4 20.dc6 bc6 21.Qg4+–) 18.Bf6! Nf6 (18...Qf6 19.Rf6) 19.bc6 (better 19.Qf3 Ng4 20.Rg6 hg6 21.Qg4 dc4 22.Qg5 Nd4 23.Qg6 Kb8+–) 19...b6 (19...h5 20.Qb3 b6 21.Qb5+–) 20.Qf3 Kc7 21.Bf5 Qf7 (21...Nd7 22.Qg3 Ne5 23.Qe5 Kc8 24.Rg6 Rd7 25.Rg8) 22.Qg3 Kc8 23.Rf6 (23.Rf6 Qd7 24.Rf7 Rh8 25.Bd7 Kd8 26.c7) 1–0. retiponziani (1880) – dotto (1845), ChessWorld.net, 2011.

4.Ba3 Qb6

5.Bf8 Kf8 6.a4 a5 7.e3 g6 (7...Be6 8.Nf3 Nd7 9.d4=) 8.Nf3 Qf6 (8...Nd7 9.d4 ed4 10.Qd4 Qd4 11.ed4=) 9.Nc3 (9.d4 ed4 10.Nd4 c5 11.bc6 Nc6=) 9...c6 (9...Ne7 10.Be2=) 10.g3 (10.d4 e4 11.Nd2 Kg7=) 10...Be6= 11.Rb1 (11.h4=) 11...b6 (better 11...Ne7!?=) 12.bc6 Qd8? (better 12...Nc6!? 13.Rb6 Nge7+=) 13.Ne5+– Qc7 (13...Ne7 14.Qf3 Nec6 15.Nd3+–) 14.Nd7! Nd7 (14...Nd7 15.cd7 Passed pawn; 14...Bd7 15.Nd5 Deflection (15.cd7 Passed pawn)) 15.cd7 Qd7 (15...Nf6!?+–) 16.Rb6+– Kg7 17.Bb5 (17.Bg2 Nf6+–) 17...Qe7 (17...Qd8!? 18.Qa1 d4 19.Re6 fe6 20.Ne2+–) 18.Qa1 (18.Bc6 Rc8 19.Qa1 Nf6 20.Nd5 Bd5 21.Bd5 Rc2+–) 18...Nf6 19.h4 (19.Bc6 d4 20.Ne4 Ne4 21.Be4 Rad8+–) 19...Rhb8 (19...Qd8 20.Rc6 d4 21.ed4+–) 20.Rb8+– Rb8 21.f3 (21.Ne2 Rc8+–) 21...Qd6 (21...Rc8+–) 22.f4 (better 22.Ne2!? Bd7 23.Bd7 Qd7 24.g4+–) 22...d4 (22...Bf5 23.h5+–) 23.Ne2 (23.Nd1 Rc8+–) 23...de3+= 24.de3 Bd7 (24...Bd5 25.Qd4 Qc7 26.Rg1+–) 25.0–0 (better 25.Qd4!? Qc7 26.h5+–) 25...Bb5+= 26.Rd1?? (better 26.ab5 Rb5 27.Nc3+=) 26...Qc5 (26...Qe6 27.ab5 Qe3 28.Kf1 Qf3 29.Kg1 Qe2 30.Rd6–+) 27.Nd4 (27.Qc3 Bc4–+ (27...Be2?! 28.Qc5 Bd1 29.Qa5=)) 27...Ba6 28.h5 (28.Re1–+) 28...Qh5 29.Nc6 (29.Rd2 Re8 30.Qe1 Ng4–+) 29...Rc8 (better 29...Qf3 30.Kh2 Qf2 31.Kh1 Rb2 32.Qb2 Qf3 33.Kh2 Qe2 34.Kh3 Bc8 35.Rd7 Bd7 36.f5 Bf5 37.g4 Qf3 38.Kh2 Qf2 39.Kh1 Be4) 30.Rd6= (30.Rd6 Qf3 31.Qf6 Kg8 32.Ne7 Kf8 33.Ng6 (33.Ra6?? Qd1 34.Kg2 Rc2 35.Kh3 Qh1 36.Kg4 Qh5) 33...hg6 34.Qh8 (34.Ra6 Qd1 35.Kg2 Rc2 36.Kh3 Qh1 37.Kg4 Qh5) 34...Ke7 35.Qe5 Kf8 36.Qh8 (36.Ra6 Qd1 37.Kg2 Rc2 38.Kh3 Qf1 39.Kg4 Qa6 40.Qh8 Ke7–+) 36...Ke7 37.Qe5 Kf8 38.Qh8= (38.Ra6 Qg3 39.Kf1 Qh3 40.Kg1 Qg4 41.Kf1 Qd1 42.Kg2 Rc2 43.Kh3 Qf1 44.Kh4 Rh2 45.Kg5 Rh5 46.Kf6 Qa6 47.Qd6 Qd6)). pumpkin516 – zulu22, gameknot.com, 2016.

5.Bf8 Kf8 6.a4 Nf6 7.e3=+.

5.Bf8 Kf8 6.e3 c6 7.a4 (7.Nc3 Nf6 8.Nf3 cb5 9.Ne5 b4=) 7...a6 (7...Nf6 8.Be2=+) 8.Na3 (8.Nc3 Nf6=) 8...c5 (8...Nf6 9.Nf3 Bg4 10.Be2 Bf3 11.Bf3 ab5 12.ab5=+) 9.c4 d4 10.ed4 ed4 11.Bd3 Nf6 12.Nf3 Bg4 (12...Qe6 13.Kf1=) 13.0–0 Nbd7 14.Nc2 (better 14.h3 Bf3 15.Qf3= (worse 15.gf3 Qe6–/+)) 14...Ne5!–/+ 15.Nce1 (15.Ne5 Bd1 Pinning (15...Bd1 Deflection)) 15...ab5 16.ab5 Re8 (better 16...Ra1 17.Qa1 Bf3 18.gf3 g5–/+) 17.Be2= Nf3 (17...Bf3 18.Nf3 g6 19.Ne5 Re5 20.Bf3=) 18.Bf3 (18.Nf3 Bf3 19.Bf3 g6+=) 18...Bf3= 19.Qf3 Ne4 20.Qd3 Qh6 (20...g6 21.Qc2=) 21.Nf3+= Nd6 (21...f5 22.Qa3 Qd6 23.Qa7+–) 22.Ra7 (22.Rfe1 Re1 23.Re1 g5+–) 22...Qe6 (22...g5 23.Nd4 Qg6 24.Qg6 hg6 25.Nb3+–) 23.h3 (better 23.Qa3 Qc4 24.Rc1+–) 23...Nc4?? (better 23...f6+=) 24.Re1+– Qe1 25.Ne1 Re1 26.Kh2 Nd6 27.Qg3 Re6 (27...Ke7 28.Qg7 Rc8+–) 28.Ra8 Ne8 29.Rb8 (29.b6 g6 30.Rb8 Kg7 31.Rb7 Rf8+–) 29...b6 30.Qc7 1–0. Dimraid (2030) – Lord Cuthbertson (1975), ChessWorld.net, 2007.

5.Bf8 Kf8 6.e3 Be6=+.

5.Bf8 Kf8 6.e3 Nf6 7.Nf3 a6 8.ba6=+.

5.Bf8 Kf8 6.e3 Nf6 7.Nf3 Bg4 8.h3 Bf3 9.Qf3 a6 (9...Nbd7 10.Nc3 Qd6 11.Rb1=) 10.Nc3 c6 11.Na4 (better 11.bc6!? Qc6 12.Qg3=) 11...Qa5–/+ 12.Nc3 (12.Nc5 Qa3 13.Nb3 ab5–/+) 12...ab5 13.g4 (13.Qf5 Nbd7–/+) 13...b4–+ 14.Ne2 Ne4 15.Bg2? (better 15.Qf5 b3! 16.c3 Qa2 17.Ra2 ba2 18.Ng3 a1Q 19.Ke2 Qa6 20.Ke1–+) 15...b3! 16.0–0 (16.ab3 Qd2 Mate attack; 16.cb3 Qd2 Double attack (16...Qd2 Discovered attack; 16...Nd2 Decoy)) 16...Nd2?? (better 16...b2 17.Rab1 Nd2–+) 17.Qf5–/+ Nf1 18.Qc8 Ke7 19.Qh8 Nd2 20.cb3 (20.Qg7 Nd7 21.cb3 Nb3–/+) 20...Nb3! 21.Rf1 (21.ab3 Qb5 Double attack (21...Qa1 Pinning; 21...Qa1 Deflection; 21...Qb5 Decoy)) 21...Qa2 (21...Nd7 22.Qg7 Qa2 23.Ng3–/+) 22.Ng3–/+ Nd2 (22...Nd7 23.Nf5 Ke6 24.Ng7 Kf6 25.Qh7 Nd2=+) 23.Nf5= Kd7 24.Qg7 d4? (better 24...Kd8 25.Qe5 Nd7 26.Qe7 Kc7+=) 25.Qe5 Nf1?? (25...Kc8 26.Rd1 Nb3 27.Nd4 Nd7 28.Qe8 Kc7 29.Ne6 Kb6 30.Qf7 Nbc5 31.Rd7 Qa1 32.Bf1 Nd7 33.Qd7 Qe5+–) 26.Qe7 Kc8 27.Nd6 1–0. tsodikovich (1790) – kotick (1875), gameknot.com, 2017.

4.Ba3 c5

5.bc6= Qc6

6.Bf8 Kf8

7.d4 e4 8.Qd2 f5 9.Nh3 h6 (9...Nf6 10.e3=) 10.Nf4 (10.e3 Nf6=) 10...g5= 11.Nh3 Nf6 12.g3 (12.e3 Kg7=) 12...Nbd7 13.e3 Nb6 14.Na3 Qa4 (14...Kg7 15.Rc1=+) 15.Qc3 (15.Nb5!?=) 15...Bd7=+ 16.Qc5 Kf7 17.Bb5? (17.Nb5!? Bb5 18.Bb5 Qa5 19.c3–/+) 17...Qa5 (17...Bb5 18.Nb5 Rac8 19.Nd6 Ke6 20.Nb7–+ (20.Nc8?? Rc8 21.Qc8 Nc8–+)) 18.c3 Rhc8 19.Qb4 Qb4 20.cb4 Bb5 (20...a5 21.Bd7 Nfd7 22.Kd2–+) 21.Nb5 Rc6 22.0–0 Nc4 23.Rfc1 (23.Nc3 Rac8 24.b5 Rb6–/+) 23...a6 (23...f4 24.Rc3–+) 24.Nc3 Rac8 25.Ne2 (25.b5 R6c7 26.ba6 ba6–+) 25...Nd7 (25...f4 26.ef4 g4 27.Kg2 gh3 28.Kh3–+) 26.Rc3 (26.Kg2 Ke6–/+) 26...Nb8 (26...f4 27.a4–+) 27.Rac1 Ke7 28.Kh1 Kd7 29.Kg1 (29.Kg2 R6c7–/+) 29...Rb6 (29...f4 30.Rb3–+) 30.a3–/+ Rb5 0–1. Ovcharenko,Leonid – Zagriadskiy,Dmitriy, 2008.

7.d4 e4 8.e3 b5 (8...Nf6 9.Nd2=) 9.Nd2 Nf6 10.Qb1 (10.Rb1 a6=) 10...Bd7 11.a4 ba4 12.c4 dc4 13.Qb4 Kg8 14.Bc4 Na6 (14...Be6!?=) 15.Qe7+= Be6 16.Be6 Qe6 17.Qe6 fe6 18.Ra4 Nc7 19.Ne2 Kf7 20.Ng3 Rhb8 21.Ke2 Rb2 22.Rc1 Ncd5 (22...Nb5 23.Rac4=) 23.Ra6 (23.Ke1 Ng4 24.Nc4 Rb4+/–) 23...Rb6 (23...Ke7 24.Rcc6+=) 24.Ra5 (24.Rb6 ab6 25.Nge4 h6+/–) 24...Rb2 25.Kd1 (25...e5 26.de5+– (26.Nge4?! ed4 27.ed4 Ne4 28.Ne4 Nf6 29.Nf6 gf6+/–; 26.Nde4?! ed4 27.ed4 Rb4+/–)) 1–0. Nemec,Zdenek – Rainer,Jean_Michel, corr or01–010, 2001.

7.e3 Bf5 8.Nf3 Nd7 9.Nc3 a6 10.Qb1 Ne7 11.Qb2 Rc8 12.Be2 f6 13.0–0 g5 14.Rfc1 Ng6 15.Rab1 Rc7 16.Qb4 Kg7 17.Qa5 Be6 18.Rb4 Rhc8 19.Na4 (19.Rcb1 g4 20.Ne1 f5=) 19...b5+= 20.Nc3 Nc5 21.Qa3 Nb7 (21...g4 22.Ne1 f5 23.Qb2+=) 22.Qb2= Nd6 (22...Qd7 23.h3+=) 23.a4 g4 24.Ne1 Nc4 (24...ba4 25.Rb6 (worse is 25.Bg4 Nc4 26.Rc4 dc4 27.Be6 Rb7–/+; 25.Ra4?! Ra8+=) 25...Qd7 26.Ra6=) 25.Bc4+= bc4 26.Rb6 Qd7 27.Rb1 (27.Ra6 Rb7 28.Rb6 Rcb8+=) 27...d4 (27...Rc6 28.a5=) 28.ed4+= ed4 29.Ne4 (29.Ne2 c3 30.dc3 dc3+=) 29...c3 (29...Rc6!?=) 30.dc3+= dc3 31.Qb4 (better is 31.Qc1+=) 31...Ne5?? (better is 31...Rc4 32.Rb7 Rb4 33.Rd7 Bd7 34.Rb4 f5=) 32.Nf6!+/– Qf7 33.Ne4 Rc4+= 34.Qd6?? Re4–+ 35.f3?? Nc4 (35...Nc4 36.Qd3 Re1 37.Re1 Nb6 38.Qd4 Qf6 39.Qb6 Bf7 40.Qf6 Kf6 41.fg4 Bg6–+) 0–1. Vasut,Karel (2155) – Zigo,Viktor (2280), CZE–chT2d, 2003.

7.Nf3 f6

8.e3 Ne7

9.Be2 a6 A) 10.0–0 A1) 10...Kf7 11.Nc3 (11.Nh4 g5 12.Nf3 Nd7 13.a4 Nf5 14.a5 h5 15.Nc3) 11...Be6 12.Nh4 g5 13.Nf3 g4 14.Nh4 d4 15.Nb1; A2) 10...Nf5 11.Nc3 (11.Ne1 Be6 12.Nc3 Nd7 13.Nd3 Nc5 14.Rb1 Ne4 15.Ne4) 11...Kf7 12.Ne1 Be6 13.Nd3 Nd7 14.Rb1 Nb6 15.Bg4; A3) 10...Be6 11.a4 (11.Nc3 Nd7 12.Qb1 Kf7 13.Qb4 Nc5 14.Rab1 b5 15.Nh4) 11...Nd7 12.Nc3 Kf7 13.Qb1 Nf5 14.Qb4 Nc5 15.a5; B) 10.h3 B1) 10...Be6 11.Nc3 (11.0–0 Nf5 12.Nc3 Nd7 13.Rb1 Kf7 14.Rb4 Nc5 15.a4) 11...Nd7 12.0–0 Nf5 13.Qb1 Kf7 14.Qb4 Nc5 15.a4; B2) 10...Qd6 11.Nc3 (11.0–0 Nbc6 12.Nc3 Kf7 13.Na4 Nf5 14.d4 Be6 15.Nc5) 11...Nbc6 12.0–0 Kf7 13.Nh4 g5 14.Nf3 Bf5 15.d3; B3) 10...Kf7 11.Nc3 (11.0–0 Nf5 12.Nc3 Nd7 13.Rb1 Nc5 14.d4 Ne6 15.Qd2) 11...Rd8 12.Bd3 Bf5 13.0–0 Nd7 14.Nh4 Bd3 15.cd3; C) 10.h4 C1) 10...b5 11.a3 (11.a4 b4 12.c3 a5 13.Qb3 Qd6 14.0–0 Nbc6 15.d3) 11...Nd7 12.Nc3 Nc5 13.h5 Nf5 14.Nh4 d4 15.ed4; C2) 10...Bf5 11.Nc3 Nd7 12.h5 Nc5 13.0–0 Kf7 14.Rb1 Rhd8 15.h6; C3) 10...Nd7 11.h5 (11.Nc3 Nc5 12.h5 Ne4 13.Ne4 de4 14.Nh2 Kf7 15.h6) 11...Nf5 12.g4 Nd6 13.h6 d4 14.Rg1 Qd5 15.Qc1; D) 10.Nc3 D1) 10...Qd6 11.0–0 (11.Rb1 b5 12.0–0 Bd7 13.a3 Nbc6 14.Qc1 Kf7 15.Nh4) 11...Nbc6 12.Qb1 b5 13.Qb2 Kf7 14.a3 Be6 15.Nh4; D2) 10...Kf7 11.Nh4 (11.0–0 Nf5 12.Ne1 Be6 13.Nd3 Nd7 14.Rb1 e4 15.Nf4) 11...g5 12.Bh5 Kg7 13.Nf3 Be6 14.0–0 Nd7 15.Rb1; D3) 10...Be6 11.0–0 (11.Qb1 Nd7 12.0–0 Kf7 13.Qb4 Nc5 14.Rfb1 a5 15.Qb2) 11...Nd7 12.Qb1 Kf7 13.Qb4 Nc5 14.Rab1 b5 15.Nh4.

9.Be2 Na6 A) 10.Nc3 A1) 10...Be6 11.Bb5 (11.0–0 Nc5 12.Bb5 Qc7 13.Rb1 a6 14.Be2 Kf7 15.h3) 11...Qc7 12.Ba6 ba6 13.0–0 Kf7 14.Qe2 Qc6 15.Rab1; A2) 10...Bf5 11.Nh4 (11.0–0 g6 12.Nh4 Kg7 13.Bg4 Bd7 14.Rb1 e4 15.Bd7) 11...d4 12.Bf3 Qc8 13.Nf5 Nf5 14.Nd5 Qc4 15.d3; A3) 10...Nc5 11.Rb1 (11.Bb5 Qc7 12.Rb1 Ne4 13.Rb3 Be6 14.0–0 Nf5 15.Bd3) 11...Ne4 12.Rb3 Nf5 13.0–0 Be6 14.Bb5 Qc7 15.Qb1; B) 10.a3 B1) 10...Kf7 11.0–0 (11.Nc3 Nc5 12.Rb1 Ne4 13.Rb3 Be6 14.0–0 Nf5 15.h3) 11...Be6 12.Nc3 Nc5 13.Nh4 Ne4 14.Rb1 Nc3 15.dc3; B2) 10...Bf5 11.Nc3 (11.Ra2 Kf7 12.Nc3 Nc5 13.0–0 Rhd8 14.Rb2 d4 15.ed4) 11...Nc5 12.0–0 Na4 13.Na4 Qa4 14.Qb1 Kf7 15.Rc1; B3) 10...Nc5 11.d4 e4 12.dc5 ef3 13.Bf3 Qc5 14.Qd4 Qd4 15.ed4; C) 10.0–0 C1) 10...Be6 11.Nc3 (11.a4 g6 12.Nc3 Kg7 13.Bb5 Qc5 14.Ba6 ba6 15.Qe2) 11...Nc5 12.Bb5 Qc7 13.Rb1 a6 14.Be2 Rd8 15.Rb4; C2) 10...Nf5 11.Nc3 (11.a4 Nc7 12.h3 Kf7 13.Nc3 e4 14.Nh2 Be6 15.Re1) 11...Nc7 12.Qb1 Kf7 13.Qb4 a5 14.Qb3 Be6 15.Rfb1; C3) 10...Kf7 11.Nc3 (11.a3 Be6 12.Nc3 Nc5 13.Nh4 g5 14.Nf3 g4 15.Nh4) 11...Nc5 12.Rb1 Rd8 13.Nh4 Kg8 14.Qe1 d4 15.Bb5.

9.Be2 Nd7 A) 10.Nc3 A1) 10...Kf7 11.Bb5 (11.0–0 Nc5 12.Rb1 Na4 13.Rb3 Nc5 14.Rb1 Na4 15.Rb3) 11...Qc7 12.Nh4 a6 13.Be2 Nc5 14.0–0 g5 15.Nf3; A2) 10...Nb6 11.0–0 (11.Rb1 Be6 12.Bb5 Qc5 13.0–0 Nf5 14.Ne1 e4 15.Ne2) 11...Nf5 12.Qb1 Be6 13.Qb4 Kf7 14.Rfb1 Nd6 15.a4; A3) 10...Nc5 11.Rb1 (11.Bb5 Qc7 12.a4 a6 13.Be2 Kf7 14.0–0 Rd8 15.Qb1) 11...Ne4 12.Rb3 Be6 13.0–0 Kf7 14.Bb5 Qc7 15.Nh4; B) 10.h3 B1) 10...Nc5 11.0–0 (11.d4 e4 12.dc5 ef3 13.Bf3 Qc5 14.Nd2 Bf5 15.Nb3) 11...Ne4 12.d4 Ng6 13.de5 fe5 14.c4 Be6 15.Bd3; B2) 10...b5 11.a3 (11.0–0 Kf7 12.a3 Nf5 13.Nc3 a6 14.Qb1 Nc5 15.d4) 11...Nc5 12.Nc3 a6 13.0–0 Ne4 14.Na2 Qc7 15.d3; B3) 10...Kf7 11.0–0 (11.Nc3 Nc5 12.Rb1 Ne4 13.Rb3 Be6 14.0–0 Nf5 15.Qb1) 11...Nb6 12.Nc3 Nc4 13.Rb1 Nf5 14.Bc4 Qc4 15.Rb3; C) 10.a4 C1) 10...Kf7 11.0–0 (11.Nc3 Nc5 12.0–0 Be6 13.Nh4 g5 14.Nf3 Ne4 15.Bb5) 11...Nf5 12.Bb5 Qe6 13.Nc3 a6 14.e4 ab5 15.ef5; C2) 10...Nb6 11.Nc3 (11.Bb5 Qc5 12.0–0 a6 13.Be2 Bd7 14.Nc3 Kf7 15.Qb1) 11...Nc4 12.Bc4 Qc4 13.Qe2 Kf7 14.Qc4 dc4 15.Ke2; C3) 10...Nc5 11.d4 (11.Nc3 Ne4 12.Ra3 Be6 13.0–0 Nf5 14.Qb1 Kf7 15.Qb4) 11...Ne4 12.0–0 Ng6 13.de5 fe5 14.c4 Be6 15.cd5; D) 10.0–0 D1) 10...Nb6 11.Nc3 (11.h3 Kf7 12.Nc3 Nf5 13.Rb1 Be6 14.Re1 Rad8 15.Qc1) 11...Nc4 12.Rb1 Kf7 13.Bd3 Rd8 14.Qe2 Be6 15.Bc4; D2) 10...g6 11.Nc3 (11.Nh4 Kg7 12.Nc3 Nc5 13.Qe1 g5 14.Nf3 Ne4 15.Rb1) 11...Kg7 12.h3 Nc5 13.Rb1 Ne4 14.Rb3 Nf5 15.Qb1; D3) 10...Kf7 11.Nc3 (11.a4 Nb6 12.Bb5 Qd6 13.Nc3 Rd8 14.h3 Be6 15.Qb1) 11...Nc5 12.Rb1 Rd8 13.h3 Ne4 14.Rb3 Bf5 15.Qb1.

9.Be2 Bf5 10.Nc3 A) 10...Na6 11.0–0 (11.Nh4 d4 12.Bf3 Qd7 13.ed4 ed4 14.Nf5 Nf5 15.Ne4) 11...Nc5 12.Nh4 Rd8 13.Bb5 Qc8 14.f4 d4 15.Nf5; B) 10...Kg8 11.0–0 (11.Nh4 Nd7 12.0–0 Be6 13.Bb5 Qd6 14.f4 ef4 15.ef4) 11...Nd7 12.Nh4 Be6 13.Bb5 Qd6 14.f4 d4 15.Ne2; C) 10...Nd7 11.0–0 (11.Nh4 Nc5 12.0–0 Rd8 13.Bb5 Qc8 14.f4 d4 15.ed4) 11...g6 12.Qb1 Kg7 13.Qb2 Qb6 14.Qa3 Qc5 15.Qb2.

9.Be2 Be6

10.0–0 A) 10...Nd7 11.Nc3 (11.h3 Kf7 12.Nc3 Nf5 13.Rb1 a6 14.Rb4 Nc5 15.a4) 11...Nf5 12.Bb5 Qc7 13.Rb1 Kf7 14.h3 Rhd8 15.Qe2; B) 10...a6 11.Nc3 (11.a4 Nf5 12.Nc3 Nd7 13.Qb1 Kf7 14.Qb4 Nc5 15.a5) 11...Nd7 12.Qb1 Kf7 13.Qb4 Nc5 14.Rab1 b5 15.h3; C) 10...Nf5 11.Nc3 (11.h4 a6 12.Nc3 Kf7 13.Rb1 Nd7 14.Rb4 Nc5 15.Qb1) 11...Nd7 12.Bb5 Qc7 13.Rb1 Kf7 14.h4 Nb6 15.Rb4.

10.a4 A) 10...Kf7 11.Nc3 (11.0–0 Nd7 12.Nc3 Nf5 13.Qb1 Nc5 14.Qb4 Rhc8 15.Rab1) 11...Nd7 12.0–0 Nf5 13.Qb1 Nc5 14.Qb4 Rhc8 15.Rab1; B) 10...Nf5 11.0–0 (11.Nc3 Nd7 12.Bb5 Qc7 13.0–0 Kf7 14.Rb1 Rhd8 15.Qe2) 11...Nd7 12.Nc3 Kf7 13.Bb5 Qc7 14.Rb1 Rhc8 15.h3; C) 10...Nd7 11.Nc3 (11.0–0 Kf7 12.Nc3 Nf5 13.Rb1 Rhd8 14.Bb5 Qc7 15.Qe2) 11...Kf7 12.0–0 Nf5 13.Bb5 Qc7 14.Rb1 Rhc8 15.Re1.

10.Nc3 A) 10...Nd7 11.0–0 (11.Bb5 Qc7 12.0–0 Kf7 13.Rb1 Nf5 14.h3 Rhd8 15.Qe2) 11...a6 12.Qb1 Kf7 13.Qb4 Nf5 14.Rfb1 Rhb8 15.a4; B) 10...Nf5 11.Bb5 (11.0–0 Nd7 12.Bb5 Qc7 13.Qe2 Nc5 14.e4 de4 15.Ne4) 11...Qc5 12.Rb1 e4 13.g4 ef3 14.gf5 Bf5 15.Bd3; C) 10...a6 11.a4 (11.0–0 Nd7 12.a4 Kf7 13.Qb1 Nf5 14.Qb4 Nc5 15.a5) 11...Nd7 12.0–0 Nf5 13.Qb1 Kf7 14.Qb4 Nc5 15.a5.

10.d4 e4 11.Nfd2 Nd7 (11...Kf7 12.Na3 b5 13.Nb5 a6 14.Na3 Qc3 15.Qc1) 12.0–0 Rc8 (12...b5 13.c3 Nb6 14.Qb3 a6 15.Qb4) 13.c3 (13.c4 dc4 14.Nc3 Nd5 15.Rc1) 13...Nb6 (13...g6 14.Na3 Kg7 15.Rc1) 14.a4 (14.Na3 Qc3 15.Nb5) 14...a6 (14...Nf5!?+= 15.a5) 15.a5+= Nd7 16.c4 f5 17.Nc3 Kf7 18.Rc1 Qd6 19.f3 Rhf8?? (19...ef3 20.Bf3 Nf6+/– (20...dc4? 21.d5 Nf6 22.de6 Qe6 23.Qe2+–)) 20.fe4+– Kg8 21.cd5 Bd5 (21...Bf7 22.Nc4 Qh6+–) 22.ed5 Nd5 (22...Qh6 23.Kh1 b5 24.Qb3+–) 23.Bc4 N7b6 (23...Rc4 24.Nc4 Qe6+–) 24.ab6 (24.ab6 Kh8 25.Nd5 Rc4 26.Nc4 Qd5 27.Ne5+–) 1–0. forsetinn (2225) – a50tango (1615), gameknot.com, 2014.

10.h3 A) 10...Na6 11.0–0 (11.Nc3 Nc5 12.Bb5 Qd6 13.Be2 Ne4 14.0–0 Kf7 15.Rb1) 11...Nc5 12.d4 e4 13.dc5 ef3 14.Bf3 Qc5 15.Nd2; B) 10...Qd7 11.Nc3 (11.0–0 Nbc6 12.Nc3 e4 13.Nd4 Nd4 14.ed4 Nf5 15.d3) 11...Nbc6 12.0–0 e4 13.Nd4 Nd4 14.ed4 Nf5 15.Qb1; C) 10...Nf5 11.Nc3 (11.0–0 Nd7 12.Nc3 a6 13.Qb1 Kf7 14.Qb4 Nc5 15.a4) 11...Na6 12.0–0 Nc7 13.Rb1 Kf7 14.Re1 Rhd8 15.Rb4.

4.Ba3 Qf6

5.Bf8 Kf8 6.c4 dc4 7.e3 a6 8.Qa4 Nd7 9.Qc4= Qb6 (9...c5 10.bc6 Qc6 11.Qb4 Ke8 12.Nc3=) 10.Nc3 Ne7 11.Nf3 f6 12.Be2 c6 13.ba6 (13.bc6 Qc6 14.Qb4 Ke8+=) 13...Ra6 (13...Qa6 14.Qa6 ba6 15.Rb1=) 14.0–0 Ra5 15.d4 Qa7 (15...ed4 16.ed4 Ra3 17.Ne4+/–) 16.de5 (16.Rfd1 ed4 17.Nd4 Ne5+/–) 16...Ne5 17.Ne5 Re5 18.Rfd1 Be6 19.Qd3 (19.Qb4 Ke8+/–) 19...Kf7+= 20.Bf3 (20.a4 b6+=) 20...g6 21.Ne4 Ra8 22.h4 (22.a4 Kg7+=) 22...Nd5 (22...Kg7 23.Nd6=) 23.Nd6 Kg7 (23...Kg8!? 24.Qc2 Qb8+=) 24.Nc4+/– Nb4 (24...Rf5 25.Bg4 b5 26.Nd6 Rf2 27.Be6 Ne3 28.Kf2 Nd1 29.Ke2 Qf2 30.Kd1 Qg1 31.Kc2 Qa1 32.Ne8 Kh8 33.Qd7 Ra2 34.Ba2 Qa2 35.Kd3 Qc4 36.Ke3 Qc3 37.Kf2 Qb2 38.Kg3 Qe5 39.Kh3 Qf5 40.Qf5 gf5 41.Kg3= (41.Nf6?? b4–+)) 25.Qd6 (better is 25.Qb1 Bc4 26.Rd7 Kg8 27.Qb4+/–) 25...b5?? (better is 25...Bc4 26.Qb4 Bd5+/–) 26.Bc6 (better is 26.Ne5 Bd5 27.Ng4+–) 26...Bc4 27.Qb4 (better is 27.Ba8!? Nc2 28.Qd8+–) 27...Qa3+/– 28.Rd7 Kh6 (28...Kg8 29.Qd2 Rb8 30.Rd1+/–) 29.Qd2+– Ra7 30.e4 Kh5? (better is 30...g5+–) 31.g4?? (better is 31.Qf4 Be6 32.Qf6 Bd7 33.Qe5 Kh6 34.Bd7 Rd7 35.Qb5+–) 31...Kg4+= 32.Ra7 Qa7 33.a4 (33.a4 Kh5 34.Qd1 Kh6 35.ab5+–) 1–0. Pietrzak,Janusz – Chachaj, Poland, 1986.

5.Bf8 Kf8 6.e3 Be6 7.Nc3 Ne7 8.Be2 g6 (8...Ke8 9.Nf3=) 9.Nf3 Kg7 10.d4 (10.0–0 c5=) 10...Nd7 (10...e4 11.Ne5=) 11.de5 Ne5 12.0–0?? (better is 12.Ne5 Qe5 13.Qd4 Qd4 14.ed4=) 12...Nf3–+ 13.Bf3 Qc3 14.Qe2 (14.Qd3 Qf6–+) 14...Rhd8 (14...a6 15.Rfd1–+) 15.Rab1 Rd6 16.e4 (16.Rfc1 Bf5–+) 16...Rad8 (16...d4!? 17.e5 Rb6 18.Rfd1 Ba2 19.Ra1–+) 17.e5 Rb6 18.Rb3 (18.Rfd1 Bf5 19.g4 Be6–+ (19...Bc2?! 20.Rdc1–/+)) 18...Qc5 19.a4 (19.a3 Nf5 20.Rb4 Bd7–+) 19...c6 (better is 19...d4!? 20.Rd3–+) 20.Qd2 (20.Ra1 Nf5 21.Qd2 Qd4–+) 20...Nf5 (20...d4 21.Qb4 Qb4 22.Rb4–+) 21.Qg5 (21.bc6 bc6 22.Rd1 Rdb8 23.Rb6 Rb6–+) 21...Qe7 (21...Qc2 22.Qf6 Kg8 23.Qd8 Kg7 24.Qf6 Kg8 25.a5 Rb5 26.Rb5 cb5 27.Qd8 Kg7 28.Bd5 Bd5 29.Qd5+–) 22.Qf4 (22.Qe7 Ne7 23.Rfb1 cb5 24.Rb5 Rb5 25.ab5 Rc8–+) 22...cb5 (22...d4 23.Rb2–+) 23.a5 (23.Rb5 Rc6 24.Qd2 Qc7–+) 23...Rc6 24.g4 (24.Qd2 Rdc8 25.Rc1 Rc5–+) 24...Nh4 (24...Rc4!? 25.Qd2 Nd4 26.Re3 Nc2 27.Rd3–+) 25.Bd1 (25.Be2 Rc2 26.Bd3 Rc5 27.Rb5 Rb5 28.Bb5 g5–+) 25...a6 (25...d4 26.Rb1–+) 26.Re1 (26.Rd3 g5 27.Qd2 Ng6–+) 26...Rc4 27.Qd2 (27.Qg3 Qg5–+) 27...Bg4 28.Bg4 Rg4 29.Rg3 (29.Kh1–+) 29...Nf3 (29...Nf3 30.Kh1 Nd2 31.Rg4 Qc5–+) 0–1. Kuznetsky,Boris – Romanov,Viktor (1990), N–08–sen, 2008.

5.Bf8 Kf8 6.e4 d4 7.c3 Ne7 (7...Nd7 8.Nf3=) 8.cd4 ed4 9.Na3 Nd7 (9...Be6 10.Nf3=) 10.Nf3 Nc5 (10...Ng6 11.Qc1 Nh4 12.Nh4 Qh4 13.d3+=) 11.d3 (11.e5 Qf4 12.d3 Bg4+=) 11...Ng6 (11...a6 12.e5 Qe6 13.Qc1=+) 12.Rc1 (12.Qc2 Ne6=) 12...b6 13.Nc2 Bg4 14.Ncd4 Rd8 (14...a6 15.ba6 Ra6 16.Qd2=) 15.Nc6+= Bf3 (15...Re8 16.h3 (worse 16.Na7 Ne5 17.Be2 Ncd3 18.Bd3 Nf3 19.gf3 Bf3–/+) 16...Bd7 17.Ncd4+=) 16.gf3 (16.Qf3 Rd6 17.Qf6 gf6+– (17...Rf6? 18.f3+–)) 16...Rd6 (better 16...Ne5!? 17.Ne5 Qe5+=) 17.d4+– Nh4 18.Rc3 Rc6 19.bc6 Ne6 20.Rd3 Ng5 (better 20...Nd4!? 21.Be2 Nc6+=) 21.Be2+– Ng2 22.Kf1 Nf4 23.Ra3 a5 24.Rg1 g6 (24...Ngh3 25.Rg3+–) 25.d5 (25.e5 Qe7 26.Re3 Kg7+–) 25...Kg7 (25...Ngh3 26.Rg3+–) 26.Qd2 (26.Qc1 Ngh3 27.Rg3 Qd6+–) 26...Re8 (26...Ngh3 27.Rg3 Qd6 28.Qb2 f6 29.Ke1+–) 27.Qc3 Re5 28.h4 Ngh3 29.Rg3 Kg8 (better 29...Qd6+–) 30.Rb3 Qe7 (30...Ne2 31.Ke2 Nf4 32.Kf1+–) 31.Ba6 h5 (31...Qd6 32.Rb6! Re8 33.Rb7+–) 32.Rb6! 1–0. qphys8 (1920) – eric2800 (1895), gameknot.com, 2017.

5.Bf8 Kf8 6.e4 de4 7.Nc3=+.

4.a4 c5

5.a5 Nf6 =+.

5.bc6 bc6 6.e3 (6.Nf3 Nd7=+) 6...Be6 (6...Nd7 7.Nf3=+) 7.Nf3= f6 (7...Nd7 8.d4=) 8.d4 (8.Ba3 c5=) 8...e4 (8...Nd7 9.Ba3 Qc7 10.Bf8 Nf8 11.Be2=) 9.Nfd2 (9.Ba3 Qc7 10.Bf8 Kf8+=) 9...Nh6 (9...Qc7 10.c4=) 10.Ba3+= Qc7 11.Bf8 Rf8 12.c4 f5 (12...Kf7 13.Nc3+=) 13.cd5 cd5 14.Bb5 (14.Na3 f4+=) 14...Kf7= 15.h3 (15.Ra3 f4=) 15...a6 16.Be2 (16.Qh5 Kg8 17.Be2 f4=+) 16...Kg8 (16...f4 17.ef4 Qf4 18.Nb3=+) 17.0–0= f4 18.Na3 (18.Qb3 Qc6 19.Na3 Qd6=) 18...Nf5 (18...f3 19.gf3 Bh3 20.fe4 Bf1 21.Qf1–/+) 19.Qb3 Rf6 (19...Nc6 20.Rac1 Rfb8 21.Qc3=+) 20.Rac1= Qf7 (20...Nc6 21.Rc5=) 21.Bg4 (better is 21.Kh2=) 21...h5 (21...Nd7!?=) 22.Bf5 (22.Bh5 Qd7+/–) 22...Rf5+= 23.ef4 Rf4 24.Rc3 (24.f3 ef3 25.Nf3 Nd7+=) 24...Nd7= 25.Qb7 (25.Rc6 Rb8 26.Qe3 Rb6 27.Rc8 Nf8+=) 25...Rf8 Black gets the initiative 26.Qa6 Rf2–/+ 27.Nab1 Qf6 28.a5 Rf1 29.Nf1 Qd4 30.Kh2 Qe5 31.Kg1 Qf6 32.Qe2 d4 33.Ra3 d3 34.Qd1?? Qf2 35.Kh2 Qf1 36.Qf1 Rf1 37.a6 Rb1 38.a7 Bd5 (39.Ra2 Ba8–+) 0–1. Stekelenburg,R – De Jong,P, internet, 1989.

5.bc6 Nc6 6.Ba3 Qf6 7.Bf8 Kf8 8.e3 Nge7 9.c4 Be6 10.cd5 Nd5 11.e4 (11.Nc3!?+=) 11...Ndb4–/+ 12.Nf3 g5 (12...Bg4!? 13.Na3 Qf4–+) 13.h3 h5 14.Na3 Kg7 15.Be2 g4 16.hg4? (better is 16.Nh2+=) 16...hg4–+ 17.Nh2 (17.Rh8 Rh8 18.Bf1 gf3 19.Qf3 Qf3 20.gf3–+) 17...Qg5 (better is 17...Qf4 18.d4 g3 19.fg3 Qg3 20.Kf1 Rh2 21.Rh2 Qh2–+) 18.g3 Nd4 (18...Rh7 19.Kf1 Rd8–+) 19.Kf1? (better is 19.Rb1!? a5 20.Nb5–/+) 19...Rad8 20.Nc4 (20.Rb1 Ne2 21.Ke2 Rd4–+) 20...Bc4 (better is 20...Qg6!? 21.Kg1 Qe4 22.Ne3–+) 21.Bc4 Nf3 22.Kg2 Nh2 23.Rh2 Rh2 24.Kh2 Rd2 (better is 24...Qh5 25.Kg1 Rh8 26.Qg4 Qg4–+) 25.Qf1 Nc2 (25...Nc2 26.Kg1 Na1 27.Qa1 Rc2–+) 0–1. Epple,Rolf (1905) – Villing,Dieter (2175), Staufer Seniors op, 2008.

5.bc6 Nc6 6.Nf3 =+.

5.e3 Nf6 6.Ne2 Be7 7.f4 (7.Ng3 0–0=+) 7...e4 (7...Nbd7!?–/+) 8.Be5 (8.Ng3 h5 9.Be2 g6=+) 8...Qd8 9.d3 (9.Ng3!?=+) 9...0–0 (9...ed3 10.Qd3 (10.cd3? Ng4–+) 10...Nbd7 11.Nbc3–/+) 10.h3 (10.de4 Nbd7 11.Bf6 Nf6=+) 10...ed3 (10...Nbd7!? 11.Bb2–+) 11.cd3–/+ Nfd7 (11...Be6 12.Nd2–/+) 12.Bc3 (12.Bb2 Re8=+) 12...Bf6 13.Qd2 (13.Bf6 Nf6 (worse 13...gf6 14.Nbc3=; worse 13...Qf6 14.Nbc3=) 14.Kf2 Re8–/+) 13...Re8 14.g3 (14.Bf6!? Nf6 15.Kf2–/+) 14...d4–+ 15.ed4 cd4 16.Ba5 Qe7 17.Bg2 (17.Bb4 Nc5 18.Bc5 Qc5–+) 17...Nc5 18.Bb4 (18.Ra3 a6 19.Bb4 Nbd7–+) 18...Nd3! 19.Qd3 Qb4 20.Nd2 (20.Kf2 Nd7 21.Rc1 Nc5–+) 20...Nd7 21.Rb1 (21.Kd1 Re3 22.Qc4–+) 21...Nc5 22.Qf3 (22.Qc2 Qc3 23.Qc3 dc3–+) 22...Qa5 23.Kd1 (23.Qa3 d3 24.Bf3–+) 23...Qa4 24.Nb3 Bf5 (24...Bf5 25.Ra1 Bc2 26.Ke1 Qb4 27.Kf2 d3–+) 0–1. Renkine,Ivan (1785) – Daneri,Martin (2075), IRT MAYOR CADA, 2017.

5.e3 Nf6 6.Nf3 Nbd7 7.c4 d4 8.ed4 cd4 9.Be2 (better 9.d3–/+) 9...d3–+ 10.Bf1 e4 11.Nd4 Nc5 (better 11...Qe5 12.Qc1 Bc5–+) 12.g3 (better 12.h3–+) 12...Bg4 13.Qc1 Be7 (better 13...Bf3!? 14.Rg1 Ng4–+) 14.Bg2 0–0 (14...h5 15.h4–+) 15.0–0–/+ Bh5 (better 15...h5!?–/+) 16.Nf5 Qd7 17.Ne3? (better 17.Ne7 Qe7 18.Bf6 Qf6 19.Nc3=+) 17...Nb3 18.Qc3 Na1 19.Ba1 Bg6 (19...Be2 20.Rc1 Bf3 21.c5–+) 20.f3 (20.Nd5!? Nh5–/+) 20...a6 (20...ef3 21.Rf3 Rfe8 22.Rf4–+) 21.fe4 ab5 22.ab5 Bb4 23.Qb4 Ra1 24.Nc3 Rf1 25.Bf1 (25.Kf1 Rb8=+) 25...Ne4 (25...Qd4 26.e5 Ng4 27.Qd6 Qe5 28.Qe5 Ne5 29.Bg2–/+) 26.Ne4? (better 26.Ncd5!? Re8 27.Bd3–/+) 26...Be4–+ 27.c5 Bg6 (27...Re8 28.Qc4–+) 28.Ng4? (better 28.Bg2=+) 28...Re8 (28...Qe7 29.Nf2 Rc8 30.Nd3 Bd3 31.Bd3 Rc5 32.Kg2–+) 29.Nf2 (29.Ne3 Re5 30.Qc4 Qe7–+) 29...Re1 (29...Qd5 30.Qc3–+) 30.Qc4 Rb1?? (30...Qe7 31.Kg2–+) 31.c6?? (31.Qa2 Re1 32.Qc4–+) 31...bc6–+ 32.bc6 Qc8 (32...Qe6 33.Qe6 fe6 34.Kg2–+) 33.Kg2 (33.Ne4 Be4 34.Qe4 Rc1–+) 33...Rb6 34.Bd3 Bd3 35.Nd3 Rc6 36.Qf4 (36.Qb4 Qc7–+) 36...h6 (36...Rf6 37.Qe3–+) 37.Ne5 Rf6 38.Qa4?? (38.Qe4–+) 38...Qb7 39.Kg1 (39.Kh3 Rf2 40.Qc6–+) 39...Qb1 40.Kg2 (40.Qd1 Qd1 41.Kg2 Qf1) 40…Qf1 0–1. Bushwacker (1840) – Lord Cuthbertson (1920), ChessWorld.net, 2008.

4.e3 c5

5.c4 d4 6.ed4 ed4 7.Nf3 Bg4 8.Be2? (better is 8.Qe2 Be7 9.Qe4+=) 8...Nf6?? (8...d3 9.h3 de2 10.Qe2 Be6 11.Ng5–+) 9.0–0?? (9.Nd4 Bh3 10.Bf3 Bc8 11.Qe2 Be7+/–) 9...Be7?? (better is 9...d3!?–+) 10.d3 (10.Nd4 Be2 11.Ne2 Qd3+/–) 10...0–0 (10...Bf5 11.Re1+=) 11.Nbd2 (11.Nd4!? Qf4 12.Bg4 Ng4 13.Nf3+/–) 11...Nbd7 (11...Bf5 12.Qc2+=) 12.Nb3 (12.Nd4 Be2 13.Ne2 Qd3=) 12...Rfe8 (12...Bf3 13.Bf3 Qc7 14.a4=) 13.a4 (13.Nfd4 Be2 14.Ne2 Qc7+=) 13...b6 (13...Bf5 14.a5+=) 14.Ba3 (14.Nfd4 Be2 15.Ne2 Rad8+=) 14...Bf5 (14...Qe6 15.Re1 Bf8 16.h3=) 15.a5 (15.Nfd4 Bg6+=) 15...Ne5 (better is 15...Qc7=) 16.Ng5?? (better is 16.Nbd4 Bg4 17.Bb2+/–) 16...Nfg4–/+ 17.Ne4?? (17.Bg4 Bg4 (worse is 17...Ng4 18.Nf3+=) 18.f3 Bg5 19.fg4 Be3 20.Kh1 Qg6–+) 17...Be4 (17...Nf3 18.Bf3 Qh2) 18.de4?? (better is 18.Bg4 Bd3 19.f4 Ng4 20.Qd3–+) 18...Nf3!! 19.Bf3 (19.Bf3 Qh2#; 19.gf3 Qh2#) 19...Qh2 0–1. Dietrich,Mareike – Schloemer,Armin (1810), GER–ch Net Qual3 U18, 2011.

5.bc6 Nc6 6.Be2 Nf6 7.a3 (7.Nf3 Ne4=+) 7...Be7 8.d4 ed4 9.ed4 0–0 10.Nf3 Bf5 11.0–0 Rac8 12.Nbd2 Na5 13.a4 (13.Bd3!? Bd3 14.cd3–/+) 13...Bc2 14.Qe1 Qd8 15.Ne5 Bb4 16.Bd3?? (better is 16.Ba3 Ba3 17.Ra3–/+) 16...Bd3 (better is 16...Nb3 17.Bc2 Rc2–+ (17...Bd2?! 18.Qd1 Na1 19.Bf5–+; 17...Nd2?! 18.Qd1–+)) 17.Nd3 Bd2 18.Qd2 Nb3 19.Qg5 Na1 20.Ba1 (20.Ra1 Ne4 21.Qd8 Rfd8–+) 20...h6 21.Qh4 Ne4 22.Qg4 Qg5 23.Qf3 (23.Qg5 Ng5 24.Rb1 b6–+) 23...Nd2 (24.Qd1 Nf1 25.Kf1 Rc4–+) 0–1. mehdi – grobdeg, ICC, 1998.

5.Nf3 f6 6.Be2 Nh6 7.0–0 Be7 8.c4 (8.d4 cd4 9.Ba3 Qe6 10.Be7 Qe7 11.ed4 e4=) 8...d4 9.ed4 cd4 10.Bd3 0–0 11.Qc2 f5 12.c5 Qc7 13.Qc4 (13.Re1 Bf6= (worse 13...Bc5 14.Re5 Nd7 15.Re2+–)) 13...Kh8 14.Ne5 (14.Re1 e4 15.b6 ab6 16.cb6 Qc4 17.Bc4 Bf6 18.Bd4 ef3 19.Bf6 gf6–/+) 14...Qe5 15.Bd4 Qe6 (15...Qc7 16.Re1=+) 16.Nc3 Bf6 (16...Rd8 17.Rfe1 Qd7 18.Ne2=+) 17.Bf6 (17.Qe6 Be6 18.Bf6 Rf6=) 17...Qf6=+ (worse 17...gf6 18.Rfe1 Qd7 19.Nd5+=) 18.Nd5 Qf7 19.Rae1 Be6 (19...Rd8 20.Ne7 Qf8 21.Re2=+) 20.Re6 Qe6 21.Nc7 Qc4 (21...Qc8 22.Na8 Nd7 23.Be2 Qa8 24.d4=+) 22.Bc4= Nd7 23.Na8 Ra8 24.d4 Re8 (24...Rd8 25.Bb3=) 25.Bd5 b6 (25...Re7 26.c6 bc6 27.bc6= (worse 27.Bc6 Nb6–/+)) 26.c6+– Nf6 27.Bb3 Rd8 28.Rd1 White prepares the advance d5 28...Ne4 (better 28...Ne8!?+–) 29.c7+– Rc8 (29...Rf8 30.Rc1 Nd6 31.Be6+–) 30.Rc1 Nd6 31.Be6 Re8 32.d5 g6 33.Rc6 Nhf7 34.f3 (34.g4 Rf8 35.gf5 gf5+–) 34...Kg7? (better 34...Re7+–) 35.Bf7 (35.Bf7 Nf7 36.c8Q Rc8 37.Rc8+–) 1–0. DEFFM – GuestYCRM, freechess.org, 2018.

4.e3 Bd7

5.a4 b6 6.Nf3 Nf6? (better 6...e4!? 7.Ne5 Bf5=) 7.Ne5 (7.Be5 Qc5+–) 7...c6 8.Nd7 Nbd7 9.Be2 (9.bc6 Qc6 10.Bb5 Qe6+–) 9...c5 (9...Be7 10.0–0+–) 10.0–0 Be7 11.c4 0–0 12.cd5 Nd5 13.f3 (13.Nc3 Rad8+–) 13...Bd8 (13...Bf6 14.Nc3+–) 14.Nc3+– Bc7 (14...Nc3 15.dc3 Qe6 16.e4+–) 15.f4 N5f6 16.Bf3 Rfe8? (better 16...Rad8+–) 17.Ba8 Ra8 18.Qf3 Re8 19.Rad1 h5 (19...Qd3 20.Qe2 Qc2 21.Ba1+–) 20.Ne2 (20.d3 Nf8+–) 20...Ne4 (20...Qd3 21.Qc6 Bb8 22.Rfe1+–) 21.d3 Nef6 22.e4 Ng4 (22...Qe7 23.e5+–) 23.h3 Nh6 (23...Ngf6 24.Nc1 Qe7 25.e5+–) 24.Ng3 (24.Qh5 Qe6+–) 24...Re6 (24...h4 25.Ne2+–) 25.e5 Qe7 26.Nh5 Qh4 27.Ng3 Rg6 28.Kh2 (28.Ne4 Nf5 29.Ng5 Nf8+–) 28...Nf8 (28...Ng4 29.Kh1 Ne3 30.Qe3 Rg3 31.Qe1+–) 29.f5 (29.Ne2!? Nf5+–) 29...Rg5 30.Ne4 (better 30.Rde1 Ng4 31.Kh1+–) 30...Rf5 31.Qg3 Qg3 32.Kg3 (32.Ng3 Be5 33.Be5 Re5+–) 32...Rf1 (32...Be5 33.Be5 Re5 34.Nd6+–) 33.Rf1 Ne6 (33...Nd7 34.Kf4 f6 35.Ke3 Ne5 36.g4+–) 34.Rf3 (34.Kh2 Nf8+–) 34...g6 (34...Nd4 35.Bd4 cd4 36.Nd6+–) 35.Kf2 Nf5 36.g4 (36.Nf6 Kf8+–) 36...Nfd4 37.Rf6 (better 37.Nf6 Kf8 38.Rg3+–) 37...Be5+= 38.Bd4 (38.Bd4 Bd4 39.Kf3 Bf6 40.Nf6 Kf8 41.Nd5=) 1–0. KLINGON09 (1790) – arthur1974 (1745), lichess.org, 2020.

5.Qh5 c6 (5...e4!? 6.Be5 Qe7=) 6.Be5+– Qe6 7.Nf3 cb5 (7...a6!? 8.b6 Nf6+–) 8.Nc3+– Nc6 9.Ng5 Qe7 10.Nd5 Nf6?? (better 10...Bg4 11.Ne7 Bh5 12.Nc6 bc6+–) 11.Bf6 (11.Bf6 gf6 12.Ne7 fg5 13.Nc6 bc6 14.Qg5+–; 11.Ne7?! Nh5 12.Nc6 Bc6+–) 1–0. GuestLVKD – GuestXSXY, freechess.org, 2020.

4.e3 Be6

5.Nf3= Nd7 6.Be2 f6 7.0–0 Ne7 8.Nc3 Ng6 9.a4 c5 10.bc6 bc6 11.d4 e4 (11...Rb8 12.de5 fe5 13.Rb1=) 12.Nd2 (12.Ba3 c5 13.dc5 Nc5+/–) 12...Qc7 13.f3 f5 (13...Bd6 14.fe4 Bh2 15.Kh1=) 14.fe4 fe4 15.Bg4 (15.Rb1 Bd6 16.h3 Rb8=) 15...Bg4 16.Qg4 Nf6 17.Qe6 Be7 18.Ba3 (18.Rab1 Qd7 19.Qd7 Kd7=+) 18...Qd7=+ 19.Qd7 Kd7 20.h3 (20.Be7 Ne7 21.Rab1 Rab8=+) 20...Rhb8 21.Nb3 Ba3 22.Ra3 Kd6 23.a5 Nf8 24.Na4 Ne6 25.Raa1 Rf8 26.Nac5 Rab8 27.Ne6 Ke6 28.Nc5 Kd6 29.Rab1 Rfe8 30.Nb7 Ke7 31.a6 Nd7 32.Na5 Kd6 33.c4 Rb1 34.Rb1 Rb8 35.Nb7 Kc7 36.c5 Rf8 37.Nd6+/– Rb8 38.Rf1 g6 39.Rf7 Rb1 40.Kf2 Rb2 41.Kg3 Re2 42.Rh7 Re3 43.Kh4 Rd3 44.Rh8 Nf6 45.Kg5 Nh5 46.Kg6 Nf4+/– 47.Kf7 e3 48.Ra8+– e2 49.Ra7 Kd8 50.Ra8 Kd7 51.a7?? Ra3 52.Re8+/– Ra7 53.g3 Nh3 54.Re2+– Ra3 55.Nf5 Rf3 56.Kg6 Nf2 57.Re3 (57...Re3 58.Ne3+/–) 1–0. Hoffmann,Piotr – Rosinski,Zenon, corr 1. AMM Poland, 1991.

5.Nf3 f6 6.d4 e4 7.Nfd2 Ne7 8.c4 c6 9.bc6 bc6 10.cd5 cd5 (worse 10...Qd5 11.Nc3 Qa5 12.Nce4+–) 11.Nc3 Ng6 12.Qa4 Bd7 (12...Kf7 13.Nb5 Qa6 14.Qc2=) 13.Bb5 (13.Qb3 Bc6+–) 13...Be7 (13...a6 14.Rb1 Nc6 A) 15.Ba6?? Nb4 16.Qb3 Qa6–+ (16...Na6?! 17.Qd5 Qd5 18.Nd5–/+; 16...Ra6?! 17.0–0–+); B) 15.0–0=) 14.Bd7 (better 14.Qb3!? Bb5 15.Nb5+–) 14...Nd7+= 15.Ba3?? (better 15.Nb5 Qb6 16.Rc1+=) 15...Qa3–/+ 16.Qa3 Ba3 17.Nd5 0–0 18.0–0 (better 18.Ne4!? Rab8 19.Ke2–/+) 18...f5–+ 19.Nc7? (better 19.Rab1–+) 19...Rac8 20.Ne6 (20.Nb5 Bb4 21.Nb1 a6–+) 20...Rfe8 21.Nf4 (21.Ng5 Rc2 22.Nb3 h6–+) 21...Nf4 22.ef4 Rc2 23.Nb3 Nf6 24.Rad1 Nd5 25.Nc5 (25.g3 Rec8 26.Rd2 Rd2 27.Nd2 Rc2–+) 25...Bc5 (25...Nc3 26.Rde1–+) 26.dc5 Rc5 27.Rd4 (27.g3 Rec8–+) 27...Nf4 28.g3 (28.Rd7 a6 29.h4–+) 28…Ne2 (28...Ne2 29.Kg2 Nd4–+) 0–1. sirgeshdb – Rolloleloc (2000), lichess.org, 2020.

4.e3 f5

5.c4 Be6 6.d3 (6.Nf3!? Nd7 7.c5 Qc5 8.Ne5 Ne5 9.Be5=) 6...dc4+= 7.dc4 (7.Ba3 Qd7+=) 7...Qd1–/+ 8.Kd1 Nd7 9.Nf3 0–0–0 10.Ke1 e4 (10...Ngf6 11.Ne5 Bb4 12.Ke2 Ne5 13.Be5+=) 11.Nd4 (11.Ng5 Nc5=) 11...Nc5 12.Ba3 (12.Nd2 Nh6=) 12...Bd7+= 13.Be2 (13.Nb3 Na4+=) 13...Nf6 14.Bb2 Be7 (14...Kb8 15.Nc3+=) 15.Nd2 (15.Nc3 Bd6+=) 15...Rhf8 (15...Na4 16.Rb1–/+) 16.a4 a5 17.ba6 Na6 18.N2b3 (18.a5 Nb4 19.Ba3 Rf7+=) 18...Bb4 (better is 18...Nb4 19.c5 Nfd5–/+) 19.Kd1? (better is 19.Kf1+=) 19...c5–+ 20.Nb5? (20.a5–+) 20...Bb5 21.Kc2 Bc6 (better is 21...Bd7–+) 22.Na5 (22.a5–+) 22...Rd2 23.Kc1 (23.Kb3 Ba5 24.Rhe1 Rfd8–+) 23...Re2 (23...Re2 24.Nc6 bc6–+) 0–1. Dietrich,Mareike – Schloemer,Armin (1610), GER–ch Net Qual2 U18, 2011.

5.c4 Nf6 6.Nf3 e4 7.Nd4 =.

5.Qh5 g6 6.Qd1 Nf6 7.a4 c5 8.Ba3 a6 9.d4 ed4 10.ed4 Qe6 11.Be2 ab5 12.dc5 Ra4 (12...ba4 13.Nc3=+) 13.Nf3 (13.Nc3 Rg4 14.Nb5+/–) 13...Bc5 14.Bc5 Ra1 15.Nd4 Qe4 16.0–0 Kf7 17.Bf3 (17.Nf3 Qe8=+) 17...Qe8 18.Qc1 Nc6 19.Qb2 Ra4 (19...Ra5 20.Nd2–/+) 20.Nb5 (20.Nc3 Ra6=) 20...Kg7 21.Nd6 (21.N1c3 Rh4=+) 21...Qd7 (better is 21...Qe5 22.Nc3 Rh4–/+) 22.Nc3+= Rc4?? (22...Ra5 23.Nd5 Qe6 24.Nb7 Ne5 25.Na5 Nf3 26.gf3 Qd5+/–) 23.Nd5+– (23.Nc4?! dc4 24.Nd5 Qe6 25.Nf6 Qf6 26.Qf6 Kf6 27.Bc6 Rd8+–) 23...Rf8 (23...Rc5 24.Qf6 Kh6+–) 24.Nc8 (better is 24.Nc4 Qd8 25.Rd1+–) 24...Rc5–/+ 25.Nf6 Rf6 (25...Qc8 26.Nh5 Kf7 27.Qf6 Ke8 28.Re1 Kd7 29.Qg7 Kd8 30.Qf8 Kc7 31.Qc5+–) 26.Nb6 Qf7 (better is 26...Qd4 27.Qb1 Ne5 28.Bb7 Qd6–+) 27.Nd5?? (better is 27.c4 Ne5 28.Be2=+) 27...Rd5–+ 28.Bd5 Qd5 29.Qb7 Kh6 30.f3 Rd6 31.h3 Qd4 32.Kh2 Ne5 33.Qe7 34.Qf8 Kh5?? (better is 34...Qg7 35.Qb8 Qe7–+) 35.g4+= fg4 36.fg4 Kg5 37.Qe7 Kh6 38.g5 Kh5 39.Qh7 Kg5 40.Rg1 Kf6? (better is 40...Kf5 41.Qf7 Rf6 42.Rf1 Kg5 43.Qf6 Qf6 44.h4 Kh4 45.Rf6 g5+–) 41.Qg6 (better is 41.Rg6 Ke5 42.Qh5 Ke4 43.Rg4 Ke3 44.Qg5 Kf3 45.Rd4 Rd4 46.Qg2 Kf4 47.Qf1 Ke3 48.Qe1 Kf3 49.Qg3 Ke4 50.h4+–) 41...Ke7= 42.Re1 (better is 42.Qh7!? Ke6 43.Rg6 Kd5 44.Qh5 Kc6 45.Qf3 Kb6 46.Rd6 Qd6 47.Qg3 Qd2 48.Qg2=) 42...Kd8 43.Qe8 Kc7 44.Re7 Kb6 45.Qb8 Kc5 (better is 45...Ka6 46.Qb7 Ka5 47.Qa7 Qa7 48.Ra7 Kb6=+) 46.Re5?? (better is 46.Rc7 Rc6 47.Qa7 Nb6 48.Qa5 Kd6 49.Rc6 Kc6 50.Qe1=) 46...Kc6 (46...Qe5 47.Kg2 Qe4 48.Kg3 Rg6 49.Kf2 Rg2 50.Kf1 Qe2) 47.Qb5+– Kc7 48.Re7 Kd8?? (48...Rd7 49.Rd7 Qd7 50.Qc4 Kb6 51.Qb4 Ka6+–) 49.Qe8 1–0. MasterofDisaster – SeriousTrouble, Live Game Caissa's Web, 2004.

4.e3 Nf6

5.Ba3 Qb6 6.Bf8 Rf8 7.d4 ed4 8.Qd4 Qd4 9.ed4 +=.

5.Ba3 c5 6.bc6= Qc6 7.Nc3 Nbd7 (7...Ba3? 8.Bb5+–) 8.Bf8 Kf8 (8...Nf8?? 9.Bb5+–) 9.Nf3 g6 10.Qc1 Kg7 11.Qb2 Re8 12.Bb5 Qd6 13.0–0 a6 14.Bd7 Bd7 15.a4 (15.d4 e4 16.Ne5 Rac8=) 15...Bc6 (15...Bg4!?+=) 16.d4= Nd7 (16...ed4 17.Nd4 Ng4 18.g3=) 17.Ne2 (17.de5!? Ne5 18.Ne5 Qe5 19.Rfd1+=) 17...e4 18.Nd2 b5 19.a5 f5 20.c3 Rf8 21.Qb4 Rf6 22.Nb3 Bb7 23.Qd6 (23.Nd2 Rc8 24.Qb3 Qc7=) 23...Rd6+= 24.Nec1 Rc8 25.Na2 Rc4 26.Rfc1 (26.Nd2 Rc7+=) 26...Re6 27.Nb4 Re8 28.Kf1 (28.Nd2 Rc7+=) 28...Rec8–/+ 29.Na2 g5 30.Ke2 Kf6 31.Kd2 f4 32.Nb4 Kf5 33.Rc2 h5 34.h3 h4 35.Rf1 g4 (35...Rg8 36.f3–/+) 36.hg4+= Kg4 37.f3 (37.ef4 Kf4 38.Rh1 Kg5+=) 37...ef3 (37...Kg3 38.Na2 ef3 39.Rf3 Kg2 40.Rf4 Kg3=) 38.gf3 (38.Rf3 fe3 39.Re3 Nf6=) 38...Kf5 39.ef4 h3 (39...Rh8 40.Nd3=) 40.Rh1= Rh8 41.Nd3 Rc6 42.Nbc5 Nc5 43.Nc5 (43.dc5 Re6=) 43...Bc8+= 44.Kc1 (44.Nd3!?+=) 44...Kf4–/+ 45.Nd3 Kf5 (45...Kg5 46.f4 Kf5 47.Rhh2–/+) 46.Ne5+= Rc7 47.Kb2 (47.Rch2 Kf6 48.Kd2 Rh4+=) 47...Rch7 (47...Rg7 48.Re2–/+) 48.Rch2 Rh4 (48...Kf6 49.Kc2+=) 49.Rg1 (49.Nf7 Kf4 50.Nh8 Rh8+=) 49...R8h7 (49...R4h5!?+=) 50.Rg8= Be6 (50...Bb7!?=) 51.Rf8+= Kg5 52.f4?? (better is 52.Rh1+=) 52...Rf4–/+ 53.Re8? (better is 53.Ra8–/+) 53...Kf6?? (53...Rf6!? 54.Ra8 Bf5 55.Rg8 Kh5 56.Nd3–+) 54.Rh1 (better is 54.Rf8!? Bf7 55.Rf7 Rf7 56.Nf7 Kf7 57.Rh3+=) 54...h2 55.Rf8 Kg5 56.Re8? (better is 56.Nf3 Rf3 57.Rf3–/+) 56...Bg4 (better is 56...Rf2 57.Kb3 Bf5–+) 57.Rg8+/– Kf5 58.Rf8 (better is 58.Ng4!? Rg4 59.Rf1 Rf4 60.Rf8 Kg5 61.R8f4+–) 58...Kg5= 59.Rg8 Kf5 60.Ng4 Rg4 61.Rf1 Ke6 (better is 61...Rf4!? 62.Rf8 Kg5 63.R8f4 h1Q 64.Rf5 Kg4 65.Rh1 Rh1+–) 62.Rg4+– h1Q 63.Rh1 (63.Rg6 Kd7 64.Rh1 Rh1 65.Ra6 Rh8+–) 63...Rh1 64.Rg6 Kf5 65.Ra6 Ke4 (65...b4 66.cb4 Rh4 67.b5 Rd4 68.Ra8 Rb4 69.Kc3 Rb5 70.a6 Rc5 71.Kd4+–) 66.Kb3 (66.Rb6 Rh7+–) 66...Rb1 (66...Kd3 67.Rf6+–) 67.Kc2 Ra1 68.Kb2 (68.Re6 Kf4+–) 68...Ra4?? (68...Rh1 69.Rb6 b4 70.Rb4 Rh7+–) 69.Kb3+– Kd3 70.Rd6 Ra5 (70...Ra1 71.Kb2 Ra5 72.Rd5+–) 71.Rd5 Ke4 72.Rc5 ½–½. Morozevich,A (?) – Dlugy (?), ICC blitz, 2000.

5.a4 a6 6.c4 (6.Nf3 e4 7.Nd4 c5 8.bc6 bc6=) 6...c6 (6...ab5 7.ab5 Ra1 8.Ba1=+) 7.Nf3 Nbd7 8.Be2 g6 (8...e4 9.Nd4=+) 9.0–0 (9.d4 dc4 10.bc6 bc6+=) 9...Bg7 (9...e4 10.Nd4=) 10.h3 (10.d4 ed4 11.Qd4 0–0+=) 10...0–0 (10...e4 11.Nh2=+) 11.Qb3 (11.d4 ed4 12.Qd4 ab5 13.ab5 Ne8 14.Ra8 Bd4 15.Nd4 Nc7=) 11...Re8 (11...e4 12.Nd4=+) 12.d4= e4 (12...ed4 13.Nd4 ab5 14.ab5 Ra1 15.Ba1=) 13.Nh2 (13.Ne5 ab5 14.ab5 Ra1 15.Ba1 Qe6=) 13...Nf8 (13...dc4 14.Bc4 Nd5 15.Ba3=) 14.Ba3+= Qb8 15.Bf8 (15.cd5 cd5 16.Rc1 Be6+=) 15...Bf8= 16.b6 Bd6 17.Ng4 (17.f4 dc4 18.Bc4 Be6=) 17...Bg4 (17...Ng4 18.hg4 dc4 19.Bc4=+) 18.hg4= Qc8 (18...h6 19.c5 Be7 20.Nc3=) 19.c5 (19.Nc3 Qd8+=) 19...Bb8 20.Qd1 Kg7 21.a5 Rh8 22.Nd2 h5 23.gh5 Nh5 24.Bh5 Rh5 25.Re1 (better 25.f4=) 25...Qf5 26.Kf1?? (better 26.g4 Rg5 27.f3–/+) 26...Rh1 (better 26...Bg3! 27.f3 Rh1 28.Ke2 Re1 29.Qe1 Be1 30.Re1 ef3 31.Nf3 Qc2 32.Kf1–+) 27.Ke2 Qh5 (better 27...Qg4 28.Nf3 Rh2–+ (28...ef3?! 29.gf3 Re1 30.Qe1–+)) 28.f3=+ Rh2 29.Rg1 Bg3 30.Qf1 Re8 31.Rh1? (better 31.Ra3–/+) 31...ef3–+ 32.Nf3 Rh1 (better 32...Qh6! 33.Ne5 Be5 34.de5 Qh5 35.Kd3 Rh1 36.Qh1 Qf5 37.Ke2 Qc2 38.Kf1 Qd3 39.Kf2 Qd2 40.Kf3 Re5–+) 33.Qh1–/+ Qg4 (33...Qh1 34.Rh1 Bf4 35.Re1 Re3 36.Kf1–/+) 34.Kd2 (better 34.Qh3!? Qf4 35.Ra3=) 34...Bf2–/+ 35.Ra3 Qe4 36.Ne5? (better 36.Rd3!?–+) 36...f6 (36...Be3 37.Re3 Qd4 38.Ke2 Re5 39.Re5 Qe5 40.Kd3 Qf5 41.Kc3 d4 42.Kb4–+) 37.Qf1 fe5?? (better 37...Be3 38.Re3 Qd4 39.Qd3 Qb2 40.Qc2 Qc2 41.Kc2 Re5–+) 38.Qf2–/+ ed4 (38...Qb1 39.Rc3–/+) 39.ed4=+ Qb1 40.Re3? (40.Rf3 Qb4 41.Kc2 Re7=+) 40...Qb2 (better 40...Qa2 41.Ke1 Qa5 42.Kf1 Rf8–+) 41.Ke1=+ Qc1 42.Ke2 Qc4 43.Kf3?? (better 43.Ke1! Rf8 44.Rf3 Qc1 45.Ke2 Qc2 46.Ke1 Qb1 47.Ke2 Qb5 48.Kd1 Rf3 49.gf3 Qa4 50.Ke2 Qa5 51.Qe3 Qa2 52.Kd1 Qb1 53.Kd2=) 43...Rf8–+ 44.Kg3 Rf2 45.Kf2 Qd4 0–1. Abdullaevich (1810) – Cardiolog (2125), lichess.org, 2019.

5.a4 c6 6.Ba3 Qc7 7.Bf8 Rf8 8.bc6 (8.d4 a6 9.bc6 Nc6 10.de5 Bg4=) 8...Nc6 (8...Qc6?? 9.Bb5+–) 9.Nf3 (9.Nc3 Bf5 10.Bb5 d4 11.ed4 ed4+=) 9...e4 10.Nd4 (10.Ng1 d4+=) 10...Qe5 (10...Nd4 11.ed4 Bg4 12.Qc1+=) 11.c3= Nd4 (11...Bg4 12.Nc6 bc6 13.Qc2+=) 12.cd4 Qd6 (12...Qg5 13.d3=) 13.Bb5 (13.Nc3 Bd7=) 13...Bd7 14.Bd7 (14.Nc3 Ke7=) 14...Kd7 (14...Qd7 15.d3=) 15.Qb3 (15.d3 Rfc8=) 15...Qc6 16.0–0 a6 (16...Rfc8 17.Nc3=) 17.Nc3+= h5? (better is 17...Rab8!?+=) 18.Rac1+– Rac8 (18...Rfb8 19.Ne4! Ne4 20.Rc6 bc6 21.Qc2+–) 19.Ne2 Qd6 20.Qb7 Rc7 21.Rc7 Qc7 22.Qa6 Ng4 (22...Rb8 23.a5+–) 23.Qb5 Kd8? (23...Qc6+–) 24.Qd5 Ke7 (24...Qd7 25.Qa8 Qc8 26.Qe4+–) 25.Qc5 (better is 25.Qe4 Kd8 26.Qd5 Ke7 27.Qh5+–) 25...Qc5 26.dc5 Ra8 27.Ra1 (27.f3 Nf6 28.Ra1 Nd7+–) 27...Kd7 (27...Ra5 28.Nd4 Rc5 29.a5+–) 28.Nc3 (28.f3 ef3 29.gf3 Ne5+–) 28...f5 29.Nd5 (29.Rb1 Rc8 30.f3 ef3 31.gf3 Ne5+–) 29...Kc6 (29...Ra5 30.Nf4+–) 30.Ne7 Kc5 31.Nf5 g6 (31...Nf2 32.h4 Ng4 33.Ng7 Nf6+–) 32.h3 (better is 32.Ng3 Nf6 33.f3 ef3 34.gf3+–) 32...gf5 33.hg4 hg4 34.Kf1 (34.a5 Ra6+–) 34...Kb4 (34...Ra5 35.Ke2+–) 35.Ke2+– Ra4 (better is 35...Ka5+–) 36.Ra4 Ka4 37.d3 (37.f3 g3+–) 37...Kb5 38.de4 fe4 39.f3 gf3 40.gf3 ef3 41.Kf3 Kc5 42.Ke4 Kd6 43.Kf5 Ke7 44.Ke5 Kd7 45.e4 (better is 45.Kf6+–) 45...Ke7= 46.Kf5 Kf7 47.e5 Ke7 48.Kg5 Ke6 49.Kf4 Ke7 50.Kf5 Kf7 51.e6 Ke7 52.Ke5 Kd8?? (better is 52...Ke8=) 53.Kd6+– Ke8 54.e7 Kf7 55.Kd7 1–0. tanto (1715) – lucyjen (1805), net–chess.com, 2002.

5.c4 Nbd7 6.cd5 Nd5 7.Nf3 f6 (7...e4 8.Nd4=+) 8.a4 Be7 9.Be2 0–0 10.0–0 c6 11.e4 Nc7 (11...Nf4 12.Bc4 Kh8 13.d4=) 12.Ba3 (better 12.d4+=) 12...Qe6? (better 12...c5=) 13.Qc2+– Kh8? (better 13...Ba3 14.Bc4 Nd5 15.Na3 N7b6+–) 14.Bc4 Qg4 (14...Nd5 15.bc6 bc6 16.ed5 cd5 17.Be7+–) 15.Be7 Re8 16.Bd6 cb5 (16...Ne6 17.h3 Qg6 18.bc6 bc6 19.Nh4+–) 17.ab5 (better 17.Bf7 Rf8 18.Bf8 Nf8 19.Qc7+–) 17...Ne6 18.Be6 Qe6 19.Bc7 Re7 (19...a6 20.Rc1+–) 20.b6! a6 (20...ab6 21.Ra8 Pinning (21.Ra8 Deflection); 20...Nb6 21.Rc1 Combination) 21.Rc1 Nb6 (21...Re8 22.d4 ed4+–) 22.Bb6 1–0. AleksandrNekhoroshik (1700) – Jan75 (1710), lichess.org, 2020.

5.d4 ed4 6.Qd4 c5 7.Qd1 Be7 8.c4 0–0 9.cd5 Nd5 10.Nc3 Be6 11.Nge2 Nc3 12.Qd6 Bd6 13.Nc3 a6 14.0–0–0 Be5 15.Nd5 Nd7 16.ba6 ba6 17.Be2 Rab8 18.Be5 Ne5 19.Rd2 a5 20.Rhd1 Rfe8 (20...Rb7 21.Kc2+=) 21.Nc7 Bf5 22.Bb5 Rf8 23.Rd5 f6 24.f4 Rb7 25.fe5 Rc7 26.ef6 Rf6 27.Re5 g6 28.e4 Bg4 29.Bc4 Kg7 30.Rd2 Rf8 31.h3 (31.Kc2 Kf6 32.Red5 Re8 33.Rf2 Kg7=) 31...Kf6 32.Red5 Bc8 33.Rf2 Ke7 34.Rf8 Kf8 35.Re5 a4 36.Kb2 h5 37.h4 Bd7 38.Kc3 Be8 39.Rg5 Re7 40.Bd5 Bf7 41.Kd3 Bd5 42.ed5 Kf7 43.Rg3 Re5 44.Kc4 Re2 45.Kb5+/– c4? 46.Kc6+– c3 47.Rc3 Ra2 48.Kc7 Ke8? 49.d6 Rd2 50.Re3 Kf7 51.d7 Rc2 52.Kd8 Rc1 53.Rf3 Kg7 54.Ra3 Rc4 55.Ke7 Re4 56.Kd6 Rd4 57.Ke6 Kh7 58.Ra4!! Ra4 59.d8Q Re4 60.Kd5 Re2 61.Qg5 Rf2 62.Qe3 Rf5 63.Ke6 Kg7 64.Qa7 Kh6 65.Qd4 Kh7 66.Qd3 Kh6 67.Qf5! gf5 68.Kf5 (68.Kf5 Kg7 69.Kg5+–) 1–0. Taulien,Hans_Juergen (2350) – Schwarte,Joachim (2295), remoteschach.de, 2003.

5.d4 Ne4 6.a3 =.

5.Nf3 d4 6.ed4+– ed4 7.Bc4 (7.Na3 Qf4 8.Qe2 Be7+–) 7...Bg4 (7...c5 8.0–0 Be7 9.Qe2+–) 8.0–0 Nbd7 9.Re1 Be7 10.Ba3 c5?? (better 10...Nc5 11.Qe2 b6+–) 11.bc6!+– Nc5 (11...bc6 12.Re7 Double attack; 11...Qc6 12.Ne5 Double attack (12.Be7 Pinning; 12.Be7 Deflection; 12.Ne5 Decoy)) 12.c3 (12.cb7 Rb8 13.c3 d3+–) 12...0–0 (12...Bf3 13.Qf3 (13.gf3?! bc6 14.Qe2 Ng8+–) 13...0–0 14.cb7+–) 13.cd4 Rfe8 (13...Qc6 14.Re7 Ne6+–) 14.cb7 Rab8 15.dc5 Qc6 (15...Qc7 16.c6! Ba3 17.Re8 Re8 18.Na3 Qc6 19.Bf7 Kf7 20.Qb3 Kf8+–) 16.Bf7! Kf7 17.Ne5 Kf8 18.Nc6 Bd1 19.Nb8 Rb8 20.c6 Ba3 21.c7 Bc5 22.cb8Q Kf7 23.Qc7 (23.Qc7 Kg6 24.Qc5 Be2 25.b8Q a6 26.Re2 a5 27.Qg3 Ng4 28.Qg4 Kh6 29.Qgg5) 1–0. GuestMLSN – GuestKSGX, freechess.org, 2020.

5.Nf3 e4 6.Nd4 Be7 (6...Qb6 7.a4=+) 7.Be2= 0–0 8.0–0 c5 9.Nb3 (9.bc6 Nc6 10.f3 Re8=) 9...Nbd7 (9...a6 10.a4=+) 10.d4 (10.d3 ed3 11.cd3 a6=+) 10...c4 11.N3d2 a6 (11...Qe6 12.a4=+) 12.ba6 (12.Ba3 Qe6 13.ba6 Ba3 14.Na3 Qa6=+ (< 14...Ra6 15.Nac4 dc4 16.Bc4+=)) 12...b5 (better is 12...Qa6 13.Nc3 Qb6–/+) 13.Nc3? (better is 13.f3!? ef3 14.Bf3 Ra6 15.e4 de4 16.Ne4 Ne4 17.Be4–/+) 13...b4–+ (13...Qa6?! 14.a3–/+; 13...Ba6?! 14.a3–/+) 14.Nb5 (14.Ncb1 c3 (14...Ba6?! 15.c3–/+; 14...Qa6?! 15.a3–/+; 14...Ra6?! 15.c3–/+) 15.Bc3 bc3 16.Nc3 Ba6–+) 14...Qb6 (14...Qc6!? 15.a4 c3 16.Bc1 cd2 17.Bd2 Ba6 18.Rb1–+) 15.a4 c3 (15...Ra6?! 16.c3–/+; 15...Qa6?! 16.Nc7 Qc6 17.Na8=) 16.Bc3 bc3 17.Nc3 Ba6 18.Ba6 Ra6 19.Rb1 Qa5 20.Nb5 Qa4 21.Nc3 Qc6 22.Ne2 Rc8 23.Rc1 Ba3 24.Ra1 Bb4 25.Qc1 Ra1 26.Qa1 Bd2 27.Ng3 Qc2 28.Nf5 Bb4 29.h3 g6 30.Ng3 Bd6 31.Nh1 Qc7 32.g3 Nf8 33.Kg2 Ne6 34.g4 Ng5 35.Ng3 Nf3 36.Qa2 Bg3 37.fg3 Qc2 38.Rf2 Qa2 39.Ra2 Rc1 40.Ra8 Kg7 (41.Ra2 Rg1 42.Kf2 Rh1–+) 0–1. makaveli1982 – AndreaT1975 (1670), internet, 2007.

5.Nf3 Nbd7

6.Ba3 Qe6 7.Bf8 Nf8 8.Be2 (8.d4 e4 9.Ng1 a6+=) 8...Qd6 9.0–0 (9.d4 e4 10.Nfd2 Ng6=) 9...Bg4 10.Nd4 (10.d4 e4 11.Ne5 Be2 12.Qe2 Ng6=) 10...Bd7 (10...ed4 11.Bg4 Qb4 12.a4 de3 13.f3–/+) 11.Nb3 Ne6 12.c4 0–0 13.cd5 Nd5 14.Nc3 Rad8 (14...c6 15.Na5=) 15.a4 (15.Qc2 c6 16.Na5 Rb8=) 15...c5 (15...Nb4 16.Na5 Bc8 17.Rb1=) 16.Rc1 (16.Ne4 Qe7=) 16...b6 17.Ne4 Qe7 18.Bc4 Bc8 19.Qh5 f5 20.Ng3 g6 21.Qe2 Bb7 22.Rfd1 (22.f3 Ndc7=) 22...Kg7 (better is 22...Kh8 23.d3 f4=) 23.Nf1?? (23.f3 Ng5=) 23...Qg5?? (better is 23...Nef4 makes sure everything is clear 24.ef4 Nf4–+) 24.f3 Rfe8 25.Qf2 Nb4 26.d4 ed4 27.Be6 Re6 28.ed4 Bd5 29.dc5 Bb3 30.Qb2 Kh6 31.Qb3+/– Re2 32.Ng3?? Nd3–/+ 33.Ne2?? Qe3 (33...Qe3 34.Kh1 Nf2 35.Kg1 Nh3 36.Kh1 Qg1 37.Ng1 Nf2) 0–1. Ackermann,Robert (1910) – Horther,Heinrich (2295), Pyramiden Franken Cup 5th, 2002.

6.a4 c5 7.c4 d4 8.d3 g6 (8...de3 9.fe3 Ng4 10.Qe2=+) 9.e4 Bh6 10.Be2 Nf8 11.0–0 Ne6 12.g3 (12.a5 Nf4=) 12...Ng5 (12...a6 13.Na3=+) 13.Ng5= Bg5 14.f4 ef4 15.Bc1 Bh3 16.e5 Qe5 Decoy theme: e5 (16...Qe6!? 17.gf4 Bf1 18.Qf1 Bh4 19.ef6 Bf6+–) 17.gf4+– Theme: Double Attack. 17...Qf5 (better 17...Qe6!? 18.fg5 Bf1 19.Bf1 Ng4+–) 18.Re1+– (18.fg5?! Bf1 19.Qf1 Qf1 20.Kf1 Nd7+–) 18...Bh4 (better 18...0–0–0 19.fg5 Ng4+–) 19.Bg4 Be1 20.Qe1 Kd7 Threatening mate... how? 21.Bf5 Bf5?? (21...gf5 22.Kh1 Rae8=+) 22.Qe5 Ng4 23.Qd5 (23.Qd5 Ke8 24.Qb7+–) 1–0. onur604 (2320) – e4_Fischer (2120), lichess.org, 2020.

6.a4 e4 7.Nd4 c5 8.Nf5 (8.bc6 bc6 9.Nc3 Rb8=) 8...Qe6=+ 9.Ng3 Be7 (9...Bd6 10.Be2=+) 10.Be2 0–0 11.0–0 b6 (11...a6 12.Nc3=+) 12.Nh5 (12.f3 a6=+) 12...Bb7 (12...Nh5 13.Bg4 Qh6 14.Bh5–/+) 13.Nf6 (13.Nf4 Qd6=) 13...Bf6 (< 13...gf6 14.a5+=) 14.d4?? (better is 14.Bf6 Qf6 15.Na3=+) 14...ed3–+ 15.Bf6 Qf6 (15...de2 16.Qe2 Qf6 17.Nd2–+) 16.Bd3 (16.Bg4 Qa1 17.Bd7 Qa4 18.Qd3–+) 16...Qa1 17.Qg4 (17.c4 Qf6–+) 17...Nf6 (17...Ne5 18.Qh4 Nd3 19.cd3–+) 18.Qf3 (18.Qh4 c4 19.Bf5 Qa4–+) 18...Qa4 19.Nd2 (19.Nc3 Qb4 20.Na2 Qg4 21.Qg4 Ng4–+) 19...c4 20.Bf5 (20…Qb5 21.Rb1–+). Lazzzzzzzzzzzzy – canon7, Live Game Caissa's Web, 2004.

6.a4 Qe6 7.Be2 =+.

6.a4 Be7 7.Be2 c5 8.c4 (8.d4!? ed4 9.ed4=) 8...d4 (8...e4!? 9.Ng1 dc4–/+) 9.ed4 ed4 10.Bd3 b6 11.0–0 0–0 12.Qc2 Bb7 13.Be2 (better is 13.Re1–/+) 13...Be4?? (better is 13...Ng4 14.g3 d3 15.Bd3 Bf3 16.Bh7 Kh8–+) 14.d3=+ Bg6 15.Nbd2 Ne5 16.Nh4 Nh5 17.Ng6 fg6 18.Bh5 gh5 19.Ne4 Qc7 20.Bc1 Ng4 21.g3 h4 22.Bf4 Qd7 23.Rfe1 Rf4 (better is 23...Nf6=) 24.gf4+/– h3 25.f3 (25.a5 Rf8+/–) 25...Nf6? (better is 25...Ne3 26.Qf2 Rf8=) 26.Ng5 Qe8 (26...a6 27.Qe2 Bd6 28.Qe6 Qe6 29.Ne6+–) 27.Ne6 (27.a5!? ba5 28.Nh3 Qg6 29.Qg2 Qg2 30.Kg2 Bd8+–) 27...Qg6 28.Kh1 Bd6 29.Qd2 (better is 29.Rg1!? Ng4 30.Nd4 (30.Rg4?! Qe6 31.Qf2 Re8+/–) 30...cd4 31.Rg4+–) 29...Nh5 30.Re4 Ng3?? (better is 30...a6+/–) 31.hg3+– Qg3 32.Rg1 Qf3 33.Kh2 Bf4 (33...g6+–) 34.Qf4 (better is 34.Rf4 Qb7+–) 34...Qf4 35.Nf4 (better is 35.Rf4 g6 36.Rgf1+–) 35...g5 (35...Rf8 36.Kh3 g6 37.Kh4+–) 36.Nh5 g4 37.Rgg4 1–0. OPA – fartaholic, Live Game Caissa's Web, 2004.

6.c4 Be7 7.cd5 Nd5 8.Be2 0–0 9.0–0 Nc5 (9...e4 10.Nd4=) 10.Nc3 (10.Be5!? Qg6 11.Nd4+–) 10...Nf6 (10...Nc3 11.Bc3 e4 12.Ne5=+) 11.a4 (11.d4 ed4 12.Qd4 Be6=) 11...e4 12.Ng5? (12.Nd4!?=) 12...Qe5 (12...h6 13.Nh3 Bh3 14.gh3–+) 13.h4 (13.f4 Qf5=+) 13...Bd6 (13...h6 14.f4 Qd6 15.Ba3 hg5 16.hg5–/+) 14.g3? (14.f4 Qe7–/+) 14...Nd3?? (better 14...h6 15.Nce4 Qb2–+) 15.Ba3 (15.Bd3 ed3 16.a5 h6–/+) 15...Ba3 16.Ra3 h6 (16...Qe7!? 17.Ra1 Rd8=+) 17.Nge4= Ne4 18.Bd3 (better 18.Ne4 Nf2 19.Rf2 Qe4 20.Qc1+=) 18...Nc3 (better 18...Ng3 19.fg3 Qg3 20.Kh1 Qh4 21.Kg1 Qg3 22.Kh1 Qh4 23.Kg1 Bh3=+) 19.Rc3+– Bh3 20.Re1 Rad8 (20...Qd5 21.e4 Qe5 22.Be2+–) 21.Bf1 (21.Qf3 Bc8+–) 21...Qf5 (21...Bf1 22.Rf1 Rd7 23.d4+–) 22.Bg2 (better 22.e4!? Qe6 23.Bh3 Qh3 24.Rc7+–) 22...Bg2+– 23.Kg2 Rc8 (better 23...Qe4!? 24.Qf3 Qa4 25.Rc7 Qb5 26.Rb7 Qa5+–) 24.Qf3+– Qg6 (24...Qf3 25.Kf3 Rfd8 26.Rec1 Rd2 27.Rc7 Rc7 28.Rc7+–) 25.Qb7 Qd6 26.d4 Qb4 27.Rec1 Qa4 28.Rc7 (28.Qa6 Qb4+–) 28...Rb8 29.Qa7 Qb5 30.Re7 Qd5 31.f3?? (better 31.e4 Qh5 32.Qc7+–) 31...Rb2 32.Kh3 (32.Kh1 Qf3 33.Kg1 Qg2) 32...Qf3 (32...Qf5 33.g4 Qf3) 33.Rcc7 (33.Qc5 h5 34.Qc2 Rc2 35.Rc2 Qf5 36.g4 Qg4 37.Kh2 Qh4 38.Kg1 Qe7 39.Re2–+) 33...Rb1 (33...Qf5 34.g4 Qf3) 34.Rc2 (34.Rc1 Rc1 35.Qa2 Rh1 36.Qh2 Qf5 37.Kg2 Qf1) 34...Rh1 35.Rh2 Qf5 36.Kg2 Qf1 0–1. AleksandrNekhoroshik (1720) – marktaboo (1840), lichess.org, 2021.

6.Be2 =+.

4.Nf3 Nd7

5.a4 f5 6.e3= Ngf6 7.Ng5 (7.d4 Ne4 8.Ba3 Qe6=) 7...h6 8.Nf3 Qe6 9.Be2 Bd6 10.Nh4 (10.0–0 a6=) 10...0–0 11.Ng6 Rf7 (11...Re8 12.d4=+) 12.f4 Ne4 13.0–0? (better 13.Ne5 Ne5 14.Be5 Be5 15.fe5 Qe5 16.Ra3=) 13...Qg6–+ 14.Bh5 Qe6 15.Bf7 Qf7 16.Rf3 (16.Ba3–+) 16...ef4 17.d3 (17.ef4 a6–+) 17...Ng5 18.ef4 (18.Rf4 Bf4 19.ef4 Ne6–+) 18...Nf3 19.Qf3 Nf6 20.Nd2 Bd7 21.h3 (21.Re1 Bc5 22.Kh1 c6–+) 21...Re8 22.Rf1 (22.Nb3 Nh5 23.g3 Qg6–+) 22...Qe6 (better 22...c6 23.Nb3–+) 23.Qg3 (23.Bf6 gf6 24.Kh2 Qe3 25.Qe3 Re3–+) 23...Qe3 (better 23...Nh5 24.Qf3 Nf4 25.Kh1–+) 24.Rf2 (24.Qe3 Re3 25.Nf3–+) 24…Qg3 (24...Qg3 25.Bf6 Re1 26.Nf1 gf6–+) 0–1. Akrapovik (1685) – FirthOfFifth (2105), lichess.org, 2021.

5.e3 a6 6.a4 ab5 7.ab5 Ra1 8.Ba1 Be7 9.c4 d4 (better 9...Ngf6!?=+) 10.ed4+= ed4 11.Bd4 (11.Nd4?! Bf6 12.Qe2 Ne7=+) 11...Ndf6 (11...Ngf6!?+=) 12.Be5+– Qc5 (12...Qb6 13.d4+–) 13.Be2 (13.d4 Qb4 14.Nbd2 Bf5+–) 13...c6 (13...Bd6 14.d4 Qb4 15.Nbd2+–) 14.0–0 cb5 (14...Nh6 15.bc6 bc6 16.d4+–) 15.d4 Qc4?? (better 15...Qb4 16.c5 Nh6+–) 16.Bc4 bc4 17.Qa4 Bd7 18.Qa8 (18.Qa8 Bd8 19.Bc7 Bc8 20.Qc8 Ke7 21.Nh4 Kf8 22.Qd8 Ne8 23.Bd6 Ne7 24.Qe7 Kg8 25.Qe8) 1–0. DEFFM – GuestHBVL, freechess.org, 2019.

5.e3 g6 6.c4 c6 7.Nc3 a6 8.a4 e4 (8...ab5 9.cd5 ba4 10.dc6 bc6 11.Ra4 Ra4 12.Qa4+=) 9.Ng5 (better is 9.Nd5!? cd5 10.Bh8 ef3 11.Qf3+/–) 9...f6 10.Nh3 Ne5 11.cd5 (11.Ba3 c5 12.ba6 Bh3 13.ab7 Ra5+/–) 11...Bh3=+ 12.gh3 (12.dc6 Bg2 13.cb7 Rb8 14.Bg2 Nd3 15.Kf1 Nb2=) 12...Nf3–/+ 13.Ke2 cd5 14.Qb3 Rd8 15.Bg2 Ne5 16.Nd1 (16.Ba3 Qd7–/+) 16...Ne7 (cont. unkn., 49 moves) (17.a5 Nd3–/+) 0–1. Canney,Randy – Jellison,D, Colorado, 1988.

5.e3 Ngf6

6.Nc3 Be7 =+.

6.c4 d4 7.ed4+= ed4 8.Bd4 b6 (8...Be7 9.Be2+=) 9.Be2 (9.Qe2 Be7+–) 9...Bb7 10.Bf6 (10.Bc3 Be7+–) 10...Nf6 11.Nc3 Bf3 12.Bf3 (worse 12.gf3 0–0–0=+) 12...Rd8? (better 12...0–0–0+=) 13.Bc6+– Nd7 14.Qe2 Be7 15.Nd5 Qe6?? (better 15...Kf8+–) 16.Nc7 (16.Nc7 Kf8 17.Ne6 fe6 18.Qe6+–; 16.Ne7?! Ke7 17.d4 Nf8+–) 1–0. AleksandrNekhoroshik – RJG_66, lichess.org, 2021.

6.d4 e4 7.Ba3 Qb6 8.Bf8 Rf8 =.

6.d4 e4 7.Nfd2 Qb4 8.Ba3 Qa5 9.Bf8 Rf8 10.c4 =.

6.d4 e4 7.Nfd2 Qb4 8.Qc1 Nb6 9.Ba3 Qa5 10.Be2 (10.Bf8 Rf8 11.c3 a6+=) 10...Nc4 11.Bf8 Rf8 12.c3 Be6 13.Nc4 dc4 14.0–0 Qb5 15.a4 Qc6 16.Na3 Rd8 (16...h5 17.Qb2=+) 17.Qb2 h6 18.Nb5 a6 19.Na3 Kd7 20.f3 Rfe8 21.fe4 Ne4 (< 21...Qe4 22.Bf3 Qe3 23.Kh1=) 22.Bf3 Bd5 23.Bg4 Ke7 24.Bf3 Qa4 25.Nc4?? (25.Be4 Be4 26.Qf2–/+) 25...Qc4–+ 26.Be4 Be4 27.Qf2 Kf8 28.Ra4 Qe6 29.c4 (29.Ra5 Rd5 30.Rfa1 Ra5 31.Ra5 Qb3–+) 29...Bd3 30.Re1 Rd4! 31.Raa1 (31.ed4 Qe1) 31...Rc4 32.e4 (32.Qd2 Qe4 33.Rac1–+) 32...Rc2 33.Qe3 Qg6 34.g3 (34.Qg3 Qg3 35.hg3 Be4–+) 34...Qh5 (better is 34...Be4!? 35.Re2 Re2 36.Qe2–+) 35.Qd3 (35.h4 Be4 36.Qa3 c5 37.Ra2 Ra2 38.Qa2–+) 35...Qh2 (36.Kf1 Rf2) 0–1. stoker – soniaprh2, Live Game Caissa's Web, 2004.

6.d4 e4 7.Nfd2 Be7 8.c4 c6 (8...0–0 9.Ba3 Qe6 10.Be7 Qe7 11.Nc3=+) 9.Ba3 (9.c5 Qc7=) 9...Qe6 (9...c5 10.Nc3 0–0 11.cd5+=) 10.Be7 Qe7 11.Nc3 (11.bc6 bc6 12.Qa4 Qe6=) 11...0–0 12.Qb3 (12.bc6 bc6 13.Rb1 c5=) 12...dc4 13.Bc4 Nb6 (13...c5 14.Rd1=) 14.Be2 (14.bc6 bc6 15.Qc2 Nc4 16.Nc4 Bf5=) 14...Be6 (14...cb5 15.Qb5 Bd7 16.Qe5=) 15.Qc2 Bd5 (15...cb5 16.Nde4 Ne4 17.Qe4=+) 16.a4 (16.bc6 Bc6 17.0–0 Rac8=) 16...cb5=+ 17.ab5 Rfc8 18.Qb2 (18.0–0 Qd6=+) 18...Qd6 19.0–0 h5 (19...Rc7 20.Rfc1=) 20.Rfb1 (20.f3 ef3 21.Bf3 Bf3 22.Rf3 Ng4=) 20...h4 21.h3 (21.Rc1 Rd8=) 21...Rc7 22.Rc1 Nbd7 23.Na4 b6 24.Nc3 Rac8 25.Nd5 Qd5 26.Rc7 Rc7 27.Rc1 Qd6 28.Nc4 Qe6 29.Nd2 Qd6 30.Nc4 Qd5 31.Nd2 Rc1 32.Qc1+= Qa2 33.Qc4?? Qd2–+ 34.Bf1 Qb2 35.d5? Nc5 36.d6 Qe5 37.Qa2 Qd6 38.Qa7 Nd3 39.Qa8 Kh7 40.Qb7 Qd5 41.Qb6 Qf5 42.Bd3 ed3 43.Qd4 Ne4 44.b6?? Qf2 45.Kh1 f5 (46.Kh2 Qg3 47.Kg1 Qe1 48.Kh2 d2 49.Qd8 d1R 50.Qd1 Qd1 51.g4 Qd2 52.Kh1 Qf2 53.gf5 Ng3#) 0–1. HomerSimpson (2290) – Chapoklak (2410), ICC, 2003.

6.d4 Ne4 7.a3 ed4 8.Bd4 =.

3.b5 Nf6

4.a4 g6 5.e3 Bg7 6.Nf3 0–0 7.Be5 Qd8 8.Qc1 (8.Be2 Nbd7 9.Bb2 Ne4 10.Bg7 Kg7=) 8...Nbd7–/+ 9.Bd4 c5 10.bc6 bc6 11.Qb2 (11.c4–/+) 11...Nb6 (11...Rb8!? 12.Qa3 c5–+) 12.a5 (12.Bd3=+) 12...Nc4 (better 12...Nbd7–/+) 13.Qc3?? (13.Bc4 dc4 14.Nc3 Bg4=) 13...a6?? (better 13...Ne4 14.Qb3 e5–+) 14.Bc4= dc4 (14...c5 15.Be5 dc4 16.Qc4+=) 15.Qc4+= Bd7 (15...Bf5 16.Qc6 Be4 17.Qa4+–) 16.Ne5 (16.Nc3 Bf5+–) 16...Qc8 (16...Be6 17.Qc6 Nd5 18.Na3+=) 17.Nd7 (17.Nc3 Ng4 18.Ng4 Bg4 19.Bg7 Kg7+–) 17...Qd7 18.0–0 (18.Nc3 Rfe8+–) 18...Rfb8 (18...c5!? 19.Bc3 Rfb8+=) 19.Nc3+– Nd5 (19...Ne8+–) 20.Nd5 (better 20.Bg7!? Kg7 21.Rfb1+–) 20...cd5+= 21.Qd3 (21.Qa2 e5 22.Bb6 Rc8+=) 21...e5= 22.Bc3 d4 (22...Qc6!?=) 23.ed4+= ed4 24.Bd4?? (better 24.Rfb1+=) 24...Qd4 25.Qd4 Bd4 26.c3 Bf6 27.Ra4?! (27.Ra2–+) 27...Rb2 28.Rd1 Rd8 29.d4 Rc2 30.Rc4 Bd4 (better 30...Rd5 31.g3 Rf5–+) 31.cd4?? (better 31.Rcd4 Rd4 32.cd4=) 31...Rc4–+ 32.g3 Rdd4 (32...Rcd4 33.Rf1–+) 33.Rb1 1–0. invictus31 – dz6186, lichess.org, 2019.

4.e3 Qb4 5.Bc3 Qh4 (5...Qd6 6.Bb2=) 6.Nf3+= Qh6 (6...Qh5 7.Be2+=) 7.Be5 c6 (7...Bg4 8.Bc7 Nbd7 9.Be2+=) 8.Be2 (8.Nc3 a6 9.a4 Ne4+–) 8...Nbd7 9.Bf4 Qg6 (9...g5 10.Ng5 Qg7 11.bc6 bc6 12.d4+–) 10.Nh4 (10.0–0 Ne4+–) 10...Qe4 11.Nc3 Qb4 12.Rb1 Qa5 13.Nf3 (13.bc6 bc6 14.Nf3 Nh5+–) 13...c5+= 14.0–0 (14.b6 a6+= (worse 14...ab6 15.Nb5+–; 14...Nb6? 15.Nb5 Ne4 16.Nc7 Kd8 17.Na8 Na8 18.c4+–)) 14...e6 15.b6 Nb6? (15...ab6 16.Nb5 Combination; 15...Nb6 16.Nb5 Combination) 16.Nb5 Kd7 (better 16...Be7 17.Nc7 Kf8 18.Na8 Na8+–) 17.Ne5 Ke7 18.Nd6!! Rg8 (18...Kd6 19.Nc4 Double attack) 19.Nef7 Ne4 20.Bd3 Nd2 (20...g5 21.Be5 Bg7+–) 21.Qd2 Qd2 22.Bg5 Kd7 23.Bb5 Kc7 24.Ne8 Kb8 25.Bf4 (25.Bf4 e5 26.Be5 Bd6 27.Bd6) 1–0. DEFFM – GuestNKTQ, freechess.org, 2019.

4.e3 Bf5 5.c4 e5 6.cd5 Nd5 7.Nf3 Nd7 8.Be2 Nb4 9.0–0 (9.Ba3!?=+) 9...Nc2–/+ 10.d4 (10.e4 Be4 (< 10...Na1 11.ef5 Qf6 12.Re1+/–) 11.d3 Bf3 (11...Na1?! 12.de4 Qd1 13.Bd1=) 12.Qc2 Bd5–/+) 10...Na1–+ 11.Ba1 ed4 (11...e4 12.Nh4 Be6 13.Nc3–/+) 12.Bd4 Nb6 13.Qb3 Qe6 14.Qb2 Na4 15.Qc1 Qa2 16.Nbd2 Rc8 (16...Bd6–/+) 17.Bd1? (17.Bc4 Qc2 18.Qa1+=) 17...Nb6 (17...Be6!? 18.Be2–+) 18.Bb3–/+ Qa5 19.Qb2 Qa3 (19...Bd3 20.Bf7 Kf7 21.Qb3 Ke8 22.Qd3 c5=) 20.Qc1? (better is 20.Qa3 Ba3 21.Ra1=) 20...Qc1–+ 21.Rc1 Be6 22.Bd1? c5 23.Be5 Nd7 24.Bb2 b6 25.Ng5 Bf5 26.g4 Bg6 27.h4 h5 28.Rc4 Bd3 29.Rf4 f6 30.Nge4 Bb5 31.gh5 Bd3 32.Bg4 Rb8 33.Nf3 Be7 34.Bf5 Nf8 35.Rg4 Rh5 36.Nd6 Bd6 37.Bd3 Rb7 38.Bb5 Kf7 39.Bc4 Ne6 40.Bd3 f5 41.Rg2 b5 42.Ng5 Ng5 43.hg5 Kg6 44.f4 Rh3 45.Kf2 Bf4 (46.ef4 Rd3–+) 0–1. Gross,Wilhelm – MEPHISTO Supermondial, 1988.

4.e3 Nbd7

5.Ba3 Qb6 6.d4 e6 (6...Ne4 7.Bd3=+) 7.Bb2 (7.Bf8!? Rf8 8.Nf3=) 7...Ne4 (7...a6 8.Bd3=+) 8.f3 Nd6 9.a4 a5 10.Nd2 Be7 (10...Nf5 11.Kf2=+) 11.Bd3 (11.c4 dc4 12.Nc4 Nc4 13.Bc4 Bb4 14.Kf2 0–0=) 11...c6 (11...0–0 12.c4 dc4 13.Nc4 Nc4 14.Bc4=) 12.c4= dc4 13.Nc4 Nc4 14.Bc4 Bb4 (14...0–0 15.Rc1=) 15.Kf2 0–0 16.Ne2 cb5 17.Bb5 Nf6 (17...Qd8 18.Rc1=) 18.Ba3 Nd5 (18...Ba3 19.Ra3 Bd7 20.Bd3=) 19.e4 (19.Qc2 Qd8=) 19...Ba3 (19...Nc3 20.Nc3 Bc3 21.Bc5+=) 20.Ra3 Nb4 21.Rc3 e5 22.Rc5 ed4 23.Qd4 Be6 24.Rhc1 Rfd8 25.Qe3 Qd6 26.Nf4+= Bd7 27.e5 Qh6 28.Bd7 Rd7 29.Rc8 Rd8= 30.Ra8 Ra8 31.Rc7 g5 32.e6 f5 33.e7 Re8 34.Qe6 Qe6 35.Ne6 h6 36.Rb7 Nc6 37.Rc7 Ne7 38.Rc5 f4 39.Ra5+/– Nc6 40.Nc7 Rc8 41.Ra8 Ra8 42.Na8 Kg7 43.Ke2 Kf6 44.Kd3 Ke5 45.Nb6 Kd6 46.Ke4 Kc5 47.Nd7 Kb4 48.Ne5 Ne5 49.Ke5+– Ka4 50.Kf5 Kb4 51.Kg6 Kc4 52.Kh6 Kd4 53.Kg5 Ke3 54.h4 (54...Kf2 55.Kf4 Kg2 56.h5+–) 1–0. Nemec,Zdenek – Sasyn,Stanislav, CSR CF, 1989.

5.Ba3 c5 6.d4 =+.

5.c4 dc4 6.Bc4= Nb6 7.Be2 Bf5 8.Nf3 e6 9.0–0 Be7 10.a4 0–0 11.a5 Nbd5 12.d3 Bg4 (12...Qb4 13.Ba3 Qa5 14.e4 Ne4 15.de4 Be4 16.Qd4+/–) 13.e4+/– Qb4 14.Ba3 Qb5 15.ed5 Ba3 16.Na3 Qd5 17.Qc2 c6 18.Nc4 Bh5 19.Ra3 Rfd8 20.Qb2 Rab8 21.Rb3 Rd7 22.Nfe5 Rc7 (22...Be2 23.Ne3 Qb3 24.Qb3 Bf1 25.Nd7 (25.Nf1?! Rc7+=; 25.Kf1?! Rc7+=) 25...Nd7 26.Kf1+–) 23.Ne3 (23.g4!? Bg6+–) 23...Qd8 24.g4 Bg6 25.h4 h6 26.g5 hg5 (26...Nd5 27.Ng6 fg6 28.Qe5+–) 27.Ng6 fg6 28.hg5 Nd5 29.Qe5 Qe7 (29...Re7 30.Bg4 Kf7 31.d4+–) 30.d4 Rf8 31.Bg4 Re8 (31...Rf5 32.Bf5 (32.Nf5?! gf5 33.Bh3 Qg5 34.Bg2 Qe7+–) 32...gf5 33.Nd5 cd5 34.g6+–) 32.Rc1 1–0. Taulien,Hans_Juergen (2350) – Bartels,Klaus (2115), remoteschach.de, 2003.

5.c4 e5 6.cd5 Nd5 7.Nc3 +=.

4.e3 e5

5.Ba3 Qe6 6.Bf8 Rf8 7.d4 e4 (7...Nbd7 8.Nc3=) 8.c4 dc4 9.Qc2 Bd7 10.Bc4 Qg4 11.g3 c6 12.Nc3 a6 13.h3 Qh5 (better is 13...Qf5!? 14.ba6 Na6 15.Ba6 ba6+=) 14.Ne4+– ab5 15.Nf6 gf6 16.Qe4 Kd8 17.Bd3 (17.Bb3 Qf5 18.Qg2 Re8+–) 17...f5 (17...Qg6!?+/–) 18.Qf4+– Na6 (18...Rg8 19.Ne2+–) 19.d5 Nc5 20.Bb5 (better is 20.Bc2!? Qg6 21.Nf3+–) 20...cb5+/– 21.Qd6 Nd3 22.Kd2 Re8 23.Qf6 (23.Kd3 f4 24.g4 (24.ef4?? Qf5 25.Kd2 Ra6–+) 24...Qg6 25.Qg6 Ra3 26.Kc2 fg6 27.ef4+=) 23...Re7?? (better is 23...Kc8 24.Kd3 Ra6 25.Rc1 Kb8+/–) 24.d6+– (24.Kd3 f4 25.d6 Ra3 26.Kd4 Ra4 27.Kc3 Qc5 28.Kd3 Qf5 29.Qf5 Bf5 30.Ke2 Re6+=) 24...Nf2 (24...Kc8 25.de7 Kc7 26.Kd3 Qg6 27.Qe5 Qd6 28.Qd6 Kd6+–) 25.Qe7 (25.de7?! Ke8 26.Qh8 Ke7 27.Qa8 Nh1 28.Qa3 Ke8+–) 25...Kc8 26.Qf8 (26…Be8 27.Qe8#) 1–0. Caissa – bigbubba, Live Game Caissa's Web, 2004.

5.Nf3 e4 6.Nd4 c5!? 7.bc6 Nc6= 8.Bb5 Bd7 9.0–0 Ng4 10.f4 ef3 11.Nf3 Be7 12.Bg7.

5.Nf3 e4 6.Nd4 Nbd7 A) 7.c4 Ne5 (7...Nc5 8.Nc3 Be7 9.Qc2 dc4 10.Bc4 0–0 11.0–0 Ng4 12.f4) 8.cd5 Nd5 9.Nc3 Nc3 10.Bc3 Be7 11.f4 Qg6 12.Qa4; B) 7.Be2 Nc5 (7...Ne5 8.Ba3 Qd8 9.Bf8 Kf8 10.Nc3 g6 11.h4 a6 12.a4) 8.Nc3 Be7 9.0–0 0–0 10.f4 a6 11.Nb3 Qd7 12.ba6; C) 7.Nc3 Nc5 (7...h6 8.Be2 Nc5 9.0–0 Be7 10.Ba3 0–0 11.Nb3 b6 12.d4) 8.Be2 Be7 9.0–0 0–0 10.f4 ef3 11.Rf3 Bd7 12.Nf5.

5.Nf3 e4 6.Nd4 Be7 A) 7.Be2 c5 (7...0–0 8.Nc3 Be6 9.Ne6 Qe6 10.g4 Nbd7 11.g5 Ne8 12.d3) 8.bc6 Nc6 9.f4 ef3 10.Nf3 0–0 11.Nc3 a6 12.a4; B) 7.Na3 0–0 (7...Qb4 8.Rb1 0–0 9.Be2 Qa5 10.Qc1 Be6 11.Ne6 fe6 12.0–0) 8.Be2 Be6 9.c4 Nbd7 10.0–0 Ne5 11.Qc2 Rac8 12.f4; C) 7.Nc3 0–0 (7...Be6 8.f4 ef3 9.Qf3 0–0 10.Be2 Nbd7 11.Ne6 Qe6 12.0–0) 8.Be2 Be6 9.Ne6 Qe6 10.g4 Nbd7 11.g5 Ne8 12.Bg4.

5.Nf3 e4 6.Nd4 Bg4 7.f3+= (7.Be2 Be2 8.Qe2 c5 9.bc6 Nc6 10.0–0 a6 11.Nc6 bc6 12.Ba3) 7...ef3 8.gf3 Bh5 9.Nf5 Qd7 10.Bh3 Qb5 11.Bf6 gf6 12.Nc3 Qc6 13.Rb1 a6 14.Nd4 Qd6 15.Rb7 c5?? (better 15...Nd7+–) 16.Nf5+– Qe5 17.Qb1 Bf3 18.Qb3 Bh1 19.Qa4 Kd8 20.Qa5 Ke8 21.Ng7 Bg7 22.Qc5 Nc6 23.Bd7 Kd8 24.Bc6 Qc7 25.Nd5 Bd5 (25...a5 26.Nc7 Bc6 27.Ne6 fe6 28.Qc6 f5 29.Qd7) 26.Qd5 Kc8 27.Bd7 Kd8 28.Bf5 Ke8 1–0. forsetinn (2050) – clojim (1990), gameknot.com, 2013.

4.Nf3 Nbd7

5.Ba3 A) 5...Qf4 6.e3 (6.Nc3 Ne5 7.e3 Nf3 8.gf3 Qh4 9.Bd3 e5 10.Bf8 Rf8) 6...Qa4 7.Qc1 Ne4 8.Qb2 c5 9.Nc3 Nc3 10.Qc3 e5; B) 5...Qe6 6.Nc3 (6.e3 Ne4 7.Nc3 Nc3 8.dc3 Qf6 9.Qd2 g6 10.Rd1 Bg7) 6...Ne4 7.Nd4 Qb6 8.Ne4 de4 9.e3 e5 10.Bf8 Nf8; C) 5...Qb6 6.e3 e5 7.Bf8 Kf8 8.Nc3 g6 9.Be2 Kg7 10.0–0 Qd6.

5.a4 a6 6.ba6 (6.Ba3 Qb6 7.e3 ab5 8.ab5 e5 9.Bc5 Ra1 10.Bb6 cb6) 6...Qa6 7.Nc3 Qb6 8.Rb1 e5 9.e3 Bc5 10.Ba3 Qe6.

5.a4 e5 6.e3 (6.g3 Be7 7.Bg2 0–0 8.0–0 e4 9.Nd4 Nc5 10.Nc3 h5) 6...Be7 7.Be2 e4 8.Nd4 Nc5 9.Nc3 0–0 10.0–0 Bd7.

5.Qc1 A) 5...a6 6.Na3 (6.Nc3 d4 7.Nd1 ab5 8.Bd4 e5 9.Bb2 Be7 10.Ne3 g6) 6...c6 7.bc6 bc6 8.Rb1 Rb8 9.c4 e5 10.Nc2 Qc7; B) 5...g6 6.c4 Bh6 7.g4 Qe6 8.g5 Nc5 9.Qc2 dc4 10.Bd4 Nd3; C) 5...e5 6.e3 (6.h3 Be7 7.e3 0–0 8.Be2 c5 9.bc6 bc6 10.Ba3 c5) 6...Be7 7.Ba3 Nc5 8.Nc3 e4 9.Nd4 0–0 10.Be2 Re8.

5.Nc3 A) 5...d4 6.Na4 (6.Nb1 e5 7.e3 Qb4 8.Ba3 Qa4 9.Bf8 Rf8 10.ed4 ed4) 6...Qb4 7.c3 dc3 8.Bc3 Qb5 9.e3 Qd5 10.Qb3 Qb3; B) 5...e5 6.e3 Be7 7.Be2 0–0 8.0–0 h6 9.h3 Re8 10.Re1 Rb8.

5.e3 Qb4 6.Qc1 (6.Bc3 Qd6 7.Bb2 e5 8.Be2 Be7 9.Ba3 Qe6 10.Be7 Qe7) 6...e6 7.Ba3 Qa5 8.Bf8 Rf8 9.Nc3 Ne4 10.Ne4 de4.

5.e3 e5 6.Ba3 Nc5 7.Nc3 e4 8.Nd4 Qb6 9.Be2 Bd6 10.0–0 0–0.

5.e3 e5 6.Ba3 Qe6 =.

5.e3 e5 6.Be2 c6 7.0–0 (7.a4 Qc7=) 7...Be7 8.bc6 (8.d4 e4 9.Ba3 Qc7=) 8...bc6 9.Ba3 Qe6 (9...c5 10.d4 Qe6 11.c4=) 10.Ng5 Qf5 11.Be7 Ke7 12.Nf3 (12.f4 e4=) 12...g5 (12...Rd8 13.d4=) 13.Nc3 (13.d4 Rb8+=) 13...h5 (13...g4 14.Ne1+=) 14.Qc1 (14.d4 Rb8+=) 14...g4= 15.Qa3 Ke6?? (better is 15...Ke8 16.Bd3 Qe6=) 16.Bd3+– gf3 (16...Ne4 17.Qa4 Bb7 18.Ne4 de4 19.Be4+–) 17.Bf5 Kf5 18.gf3 (18...Ke6 19.Kh1+–) 1–0. gtate (2520) – diggitus (2215), net–chess.com, 2007.

5.e3 e5 6.Be2 Qe6 7.0–0 =.

5.e3 e5 6.Be2 Be7 7.Ba3 Qe6 8.Be7 Qe7 9.Nc3 0–0 10.0–0 Qd6.

5.e3 g6 6.Ba3 (6.Be2 Bg7 7.Ba3 Qb6 8.Nc3 Nc5 9.0–0 0–0 10.Qb1 Nce4) 6...Qb6 7.Nc3 e5 8.Bf8 Kf8 9.Be2 Kg7 10.0–0 Qd6.

5.a4 c5

6.c4 d4 7.e3 e5 8.d3 +=.

6.c4 d4 7.g3 Ne5 8.Ne5 Qe5 9.Bg2 h5 10.d3 h4.

6.bc6 bc6 7.e3 Qc7 8.Nc3 e5 9.Rb1 Bd6 10.Be2 0–0.

6.d3 g6 7.Nbd2 Bg7 8.e4 Qc7 9.Be2 0–0 10.0–0 Rd8.

6.d4 cd4 7.Qd4 Nc5 =.

6.c4 dc4

7.Na3 c3 8.Bc3 Nd5 =.

7.e3 Nb6 8.a5 Nbd5 9.Bc4 Be6 10.Be5 Qd7.

7.e3 c3 8.Nc3 e5 9.Qc2 =.

7.e3 e5 8.Na3 e4 9.Nc4 Qd5 10.Nfe5 Be7.

7.e3 e5 8.Bc4 e4!? 9.Ng5 Ne5= 10.Qb3 Nc4.

7.e3 e5 8.Bc4+= e4 9.Ng5 Ne5 10.Be5 Qe5 11.Nf7 (11.Bf7? Ke7–+) 11...Qa1 12.Nh8 +=.

7.e3 e5 8.Bc4+= Be7 9.0–0 (9.Qb3!? e4 10.Ng5+/–) 9...0–0= 10.d4 (10.d3 a6+=) 10...cd4 (10...e4 11.Ne5 Nb6 12.Ba2=) 11.ed4+= ed4 12.Nd4 (12.Re1 Qb4 13.Bd4 Nb6 14.Bb6 ab6+=) 12...Qb6 (12...Ne5 13.Ba3 Qc7 14.b6=) 13.Nf5+= Qd8 (13...Re8 14.Re1 Bd8 15.Re8 Ne8 16.Qf3+=) 14.Ne7 (14.Qf3 Nb6 15.Rd1 Qd1 16.Qd1 Bf5+/–) 14...Qe7 15.Ba3 (15.Nd2 Nc5+/–) 15...Nc5+= 16.Qd4 (16.Re1 Be6+=) 16...b6 17.Nd2 (17.Nc3 Rd8 18.Qf4 Be6+=) 17...Rd8= 18.Qb2 (18.Qf4 Be6=) 18...Bb7 19.Bb4 (19.a5 Rd2 20.Qd2 Qe4 21.Bf7 Kf7+=) 19...Qd7 (19...Rd2 20.Qd2 Qe4 21.Bf7 Kf7 22.f3+=) 20.Ra2 (20.Bc3 Qg4 21.f3 Qf4=) 20...Bd5 (20...Rac8 21.Re1=) 21.Bc5 Bc4 (21...bc5 22.Qc2=) 22.Nc4+= bc5 23.Ne5 (23.Qc1 Qc7=) 23...Qe6 (23...Qd6 24.Re1=) 24.h3 (24.Nc6 Rd7=) 24...Rd5 (24...Ne4!? 25.Qa1 Re8=) 25.Nc6= h6 (25...Rd7 26.Ra3+=) 26.Qa3 (26.Qe2!? Qe2 27.Re2+=) 26...a6= 27.Qb2 (27.Qb3 ab5 28.ab5 Re8+=) 27...ab5 (27...Rg5 28.f4 Rg3 29.f5=) 28.ab5 (worse is 28.Qb5 Re8 29.Raa1 Ne4=) 28...Ra2 29.Qa2 Nd7?? (better is 29...Kh8+=) 30.Qa8 (better is 30.Qd5! Qd5 31.Ne7 Kh7 32.Nd5+–) 30...Kh7 31.Qa7?? (better is 31.Ne7! Qe7 32.Qd5+–) 31...c4= 32.Qc7 (32.Qa1 Rg5 (worse is 32...Rb5 33.Nd4 Qd5 34.Nb5 Qb5 35.Re1+/–) 33.Qb1 g6+=) 32...Rb5 (better is 32...c3!?+=) 33.Nd4+/– (33.Nd4 Qd5 34.Nb5 Qb5 35.Re1+/–) 1–0. algernon (2580) – chessleon (2200), net–chess.com, 2014.

3.c3 e5

4.Na3 a5 5.e3 Nf6 6.c4 Qb4 7.Rb1 Qd6 8.Nf3 Nc6 9.Rc1 Bg4 10.Nb5 Qd7 11.Be5 Ne5 (better is 11...Bf3!? 12.Qa4 Ne5 13.Nc7 Kd8 14.Qd7 Kd7 15.Na8 Ba3 16.Nb6 Kc7–/+) 12.Ne5= Bd1 13.Kd1?? (better is 13.Nd7 Kd7 14.Kd1=) 13...Qd8 14.c5 (14.cd5 Bd6 15.Nd6 Qd6 16.Bb5 Kf8–+) 14...c6 15.Nc3 (15.Nd4 Qc7 16.Nd3 Rb8–+) 15...Bc5 16.Bd3 0–0 17.Na4 Ba3 18.Rb1 Qd6 19.Rb7 (19.f4 b5 20.Nc3 Bb4–+) 19...Qe5 20.Nb6 (20.f4 Qh5 21.Ke1 Rab8–+) 20...Rab8 21.Ba6 Qa1 (22.Ke2 Qh1–+) 0–1. Regicide – Lagom, HCL–C2403 playchess.de, 2003.

4.Qb3 Be6 5.Qa4 (5.Na3 Nf6=+) 5...c6 6.a3 (6.Nf3 Nf6–/+) 6...b5 (6...Nd7!?–+) 7.Qc2=+ Nf6 8.e3 Be7 9.f3 (9.Nf3!? Nbd7 10.a4 ba4 11.Ra4=+) 9...0–0 10.Ne2 Nbd7 11.Ng3 g6 12.h4 (12.a4 ba4 13.Ra4 c5–+) 12...h5 13.a4 a6 14.Na3 e4 15.Kf2 ef3 16.gf3 Ne5 17.d4 Nc4 18.Nc4 dc4 (18...bc4!? 19.a5 Rfe8–/+) 19.e4=+ Qc7 20.a5 Nh7 21.Bc1 Kg7 22.Be3 f5 23.f4? (better 23.ef5 Bf5 24.Qd2=) 23...fe4–+ 24.Bg2?? (better 24.Qe4 Bd5 25.Qe5 Qe5 26.de5 Bh1 27.Nh1 Bh4 28.Kg2–+) 24...Rf4 25.Kg1 Rg4 26.Ne4 (26.Nf1 Nf6 27.Nh2–+) 26...Bf5 27.Re1 Be4 28.Bh6 (28.Bf4 Bc2 29.Bc7 Bh4 30.Rh4 Rh4 31.Re7 Kh6–+) 28...Kh6 29.Re4 Re4 (better 29...Nf6 30.Rg4 Ng4–+) 30.Be4 (30.Qe4 Rf8 31.Rh3–+) 30...Qg3 31.Kf1 (31.Bg2 Qe1 32.Bf1 Bh4 33.Rh2–+) 31...Rf8 32.Ke2 Rf2 33.Kd1 Rc2 34.Kc2 Qf2 35.Kb1 Nf6 36.Bc6 Ng4 37.Rc1 Ne3 38.Bb7 Qf5 39.Kb2 Qe6 (39...Qd3 40.Be4 Qe4 41.Ka1 Bh4 42.Kb2 Nd1 43.Rd1 Qe2 44.Rd2 Qd2 45.Kb1 Qd1 46.Ka2 Qc2 47.Ka1 Bf6 48.d5 Bc3) 40.Re1 Bh4 41.Re2 (41.Bc8 Nd1! 42.Rd1 Qe2 43.Rd2 Qd2 44.Kb1 Qd1 45.Kb2 Qb3 46.Ka1 Be1 47.Ba6 Bc3) 41...Bg5 (41...Nd1 42.Kc1 Qe2 43.Be4 Bg5 44.Kb1 Qb2) 42.d5 Qd6 (42...Nd1 43.Kb1 Qe2 44.Ba6 Qb2) 43.Bc6 (43.Ba8 Nd1 44.Kb1 Nc3 45.Ka1 Qb4 46.Rb2 Qa5 47.Ra2 Qa2) 43...Nd5 44.Re8 (44.Bb5 ab5 45.Rc2 Nc3 46.a6 Qb4 47.Ka1 Qb1) 44...Qc6 (44...Qh2 45.Ka1 Qg1 46.Re1 Qe1 47.Ka2 Nc3 48.Ka3 Qc1) 45.Rh8 (45.Re5 Qd6 46.Re2 Nb4 47.cb4 Qb4 48.Ka2 Bf6 49.Re5 Qb3 50.Ka1 Be5) 45...Kg7 46.Rb8 (46.Rc8 Qc8 47.Ka1 Qh3 48.Ka2 Qc3 49.Kb1 Qb3 50.Ka1 Bf6) 46...Bd2 (46...Nb4 47.cb4 Qg2 48.Kb1 c3 49.Rb7 Kh6 50.Rh7 Kh7 51.Ka1 Qb2) 47.Kc2 (47.Rd8 Bc3 48.Kc2 Bb4 49.Rd5 Qd5 50.Kb1 Qd2 51.Ka1 c3 52.Kb1 Qb2) 47...Bc3 48.Rd8 Bb4 (48...Bb4 49.Kd1 Nc3 50.Kc1 Qh1 51.Kc2 Qg2 52.Rd2 Qe4 53.Rd3 Qd3 54.Kc1 Ba3) 0–1. beatmeeasy (1930) – sverce (1945), lichess.org, 2020.

4.b5 Nf6 5.e3 Be7 6.h3 0–0 7.g4 (7.d4 Nbd7=+) 7...c6 8.g5 Ne8 9.h4 cb5 10.Bb5 a6 11.Ba4 b5 12.Bc2 Bb7 13.d4 ed4 14.cd4 Nc6 15.a3 Nc7 16.Qd3 g6 17.Nf3 Ne6 18.Nbd2 Rfe8 19.h5 Bf8 (19...Ng5!? 20.Ng5 Bg5 21.hg6 fg6=+) 20.hg6+= fg6 21.Ne5 Bg7 (21...Ng5 22.f4 Ne6 23.f5=) 22.Nc6 (better 22.Rh7! Nf8 23.Rh4 Ne5 24.de5 Be5 25.Bd4+–) 22...Bc6=+ 23.0–0–0 (23.Nf3 Qe7=+) 23...Rac8 (23...Ng5 24.Rdg1 Ne4 25.Rg2–/+) 24.f4 (24.Rdg1!?=+) 24...b4–/+ 25.ab4 (25.Kb1 Bb5 26.Qb3 ba3 27.Ba3 Qd8–/+) 25...Qb4 26.Ba3 Qb5 (26...Qb7 27.Qb3 Qd7 28.Qb2–+) 27.Qb3 (27.Qb5 Bb5 (worse 27...ab5 28.Nf3+=) 28.Kb2 Nc5 29.Bc5 Rc5=) 27...Qb3 (27...Bd4 28.Rde1 Qa5–+) 28.Nb3= a5 (28...Bb5!? 29.Kb2 a5=) 29.Na5+– Ba4 30.Rd2 Rc3 31.Bb4 Rc2 (31...Rcc8!?+–) 32.Rc2+– Bc2 33.Kc2 Rc8 34.Kd3 Rb8 35.Bd6 (35.Nc6 Rb5+–) 35...Ra8 (35...Rb6 36.Be5+–) 36.Nb3 (36.Nc6 Kf7+–) 36...Nd8 (36...Ra6 37.Be5+–) 37.Nc5 Ra3 38.Ke2 Ra2 39.Kf3 Nc6 40.Ne6 Na5? (40...Ra7+–) 41.Nc7 (41.Ng7?! Kg7 42.Be5 Kg8+–) 41...Nc4 42.Nd5 (better 42.Bb4+–) 42...Nd2 (42...Nd6 43.Ne7 Kf7 44.Rh7 Ra3=) 43.Kg4+– Ne4 44.Be5?? (better 44.Ne7 Kf7 45.Rh7 Nd6 46.f5 Rg2 47.Kf3 Rg5 48.fg6 Kf8 49.e4 Bd4 50.Kf4+=) 44...Nf2–+ 45.Kf3 Nh1 46.Ke4 (46.Bg7!? Kg7 47.Nc7 Rf2 48.Kg4 Kf7–+) 46...Ng3 47.Kf3 Nf1 48.e4? (48.Ke4 Be5 49.fe5 Rg2 50.Nf6 Kg7–+) 48...Nd2 (better 48...Ra3!? 49.Kg2 Ng3 50.Bd6–+) 49.Ke2? (better 49.Ke3–+) 49…Ne4 (49...Ne4 50.Kf3 Nd2 51.Ke2 Nb3 52.Kd3 Ra4 53.Ne7 Kf7 54.Bg7 Ke7–+) 0–1. beatmeeasy (1890) – taher1 (1895), lichess.org, 2021.

4.d3 Nf6 5.Nd2 Bf5 6.e3 Nbd7 7.d4 ed4 8.ed4 Be7 9.Be2 0–0 10.Ngf3 Ne4 11.0–0 Rae8 12.Re1 Bd8 13.Bf1 Re6 14.g3 (14.Ne4 Be4 15.Nd2 Bg6+=) 14...Rfe8 15.Ne4 de4 16.Nd2 Nb6 17.Nc4 Nc4 18.Bc4 Rg6 (18...R6e7 19.Qh5 Bg6 20.Qe2=) 19.Qb3 (19.Qa4 Bd7 20.Qa7 b5+=) 19...Rf6 (19...Qd7 20.a4=) 20.Bc1 (20.Qa4 c6 21.Qa7 b6+=) 20...Bg6 (20...Qd7 21.a4=) 21.Bg5 Rf5 22.Bd8 Qd8 23.Re3 h5 (23...b5 24.Bf1=) 24.h4 b5 25.Bf1 Qf6 26.Qb2 Rf3 (26...Rd5 27.Bg2 Qd6 28.a4+=) 27.Rae1 (better is 27.Bb5!? Rb8 28.Rf3 ef3 29.Bc4+/–) 27...Re3 28.Re3 Qc6 29.Qe2 a6 30.f4 f5 31.Bh3 Qe6 32.Qc2 Bf7 33.a4 g6 34.a5 Qc6 35.Bf1 Bd5 36.Qb2 Re6 37.Kh2 Qd6 38.Qf2 ½–½. Woloszyn,Piotr (1830) – Prus,Marek (1810), 56th YMCA Winter C, 2009.

4.Nf3 Nd7 5.e3 +=.

4.Nf3 e4 5.Nd4 f5 (5...Nf6 6.d3+=) 6.e3= Nf6 7.Be2 g6 (7...Be7 8.b5=) 8.0–0 h5 (8...Bg7 9.f3=) 9.Nb5 Qc6 10.a4 a6 (10...Nbd7 11.Nd4 Qd6 12.Na3+=) 11.Nd4 (11.c4 Rh7 (11...ab5?? 12.ab5 Ra1 13.bc6 Rb1 14.Qb1+–) 12.c5 Qe6+= (12...ab5 13.ab5 Qe6 14.Ra8+–)) 11...Qd6= 12.c4 (12.f3=) 12...Nc6 (better is 12...Qb4!? 13.Ba3 Qa5+=) 13.Nc6+/– Qc6 (13...bc6 14.c5 Qe6 15.d4+=) 14.cd5 Qd5?? (better is 14...Qd6+/–) 15.Bf6+– (15.Bf6 Rh7 16.b5+–) 1–0. Wall,Bill – Bigbat, internet, 2000.

4.e3 Nf6

5.c4 c6 (5...dc4 6.Na3 Be6 7.Nc4 Bc4 8.Bc4 Qb4 9.Qc2=) 6.cd5 cd5 7.b5 Be7 8.Nf3 Nbd7 9.Ba3 Qe6 10.Ng5 Qf5 11.Be7 Ke7 12.Nf3 Re8 13.Be2 Kf8 14.Nc3 (14.0–0 Qg6=) 14...Nb6 (14...d4!? 15.Qb1 Qb1 16.Nb1 d3–/+) 15.0–0 Be6 16.d3 Red8 17.Qc2 Rac8 18.e4 de4 19.de4 Qf4 20.Rfd1 Rd1 21.Rd1 g6 (21...Nfd7 22.Qd3=) 22.Qb2 (22.g3!? Qg4 23.Qd2 (worse 23.Ne5 Rc3 24.Qc3 Qe2=+) 23...Ne4 24.Qh6 Ke7 25.h3 (25.Ne5?! Qg5 26.Qg5 Ng5=) 25...Qh3 26.Qh3 Bh3 27.Ne4+=) 22...Nc4 23.Bc4 Bc4 24.Qb4 Kg7 25.Nd2 Be6 26.Nd5?? (better 26.h3=) 26...Bd5 (better 26...Nd5 27.Qb2 Nc3–+) 27.ed5?? (better 27.g3 Qg4 28.f3–+) 27…Qb4 (27...Qb4 28.Nf1 Nd5–+) 0–1. aravind555 – Schischerin (1630), lichess.org, 2018.

5.Nf3 Bg4 6.Be2 Nbd7 7.a4 Be7 8.a5 0–0 9.0–0 e4 10.Nd4 Be2 11.Qe2 Ne5 12.b5 Nc4 13.Nf5 Qe6 14.Ne7 Qe7 15.Ba3 Na3 16.Ra3 Nd7 (16...a6 17.b6=+) 17.c4 dc4 18.Qc4 Nc5 19.f3 Rae8 20.Ra2 Qe6 (20...ef3 21.Rf3 Qd6 22.Rc2+=) 21.Qe6 (21.Rc2 Qc4 22.Rc4 Re5+/–) 21...Re6 22.Rc1 (22.Rc2 Re5+=) 22...b6 (22...Re5 23.fe4 Ne4 24.d3=) 23.ab6 ab6 24.Ra7 Rc8 (24...ef3 25.gf3 Rc8 26.d4 Rg6 27.Kf1+/–) 25.fe4+/– Re4 26.Nc3 (26.d4 Nd3 27.Rcc7 Ree8+–) 26...Rc4 27.Rca1 Nb3 (27...Nd3 28.Ra8 Rf8 29.Nd5 Rc1 30.Rc1 Ra8 31.Nc7–+) 28.Ra8 Rf8 29.Nd5 g6 30.Rf8 Kf8 31.Ra8 Kg7 32.d4 Nd2 33.Rc8 Rc1 34.Kf2 Ne4 35.Ke2 Rb1 36.Rc7 Rb5 37.Nf4 (37.Kd3 Rd5 38.Ke4 Rd6+=) 37...Ng5 (better is 37...Rb2 38.Kf3 Nd2 39.Kg4 Nf1=) 38.h4 Ne4 39.Ne6 Kf6 40.Nd8 g5 (40...Nd6 41.Rd7 Rd5 42.Nf7+–) 41.h5 (41.Rf7 Kg6 42.Kd3 Nd6+–) 41...Ng3 (41...Rb2 42.Kf3 Nd6 43.e4 g4 44.Kf4 Rf2 45.Kg4+–) 42.Kf3 Nh5 43.g4 Ng7 44.Nf7 Ne6 45.Rb7 Rb3 46.Ke4 Rb4 47.Ne5?? Nc5–+ (48.Kd5 Nb7–+) 0–1. Ewert,Jerzy – Hoffmann,Piotr, corr 1. AMM Poland, 1991.

4.g3 Nf6–/+

5.Bg2 Be7 6.a4 Nbd7 7.Na3 a6 8.b5 0–0 9.ba6 ba6 10.h4 Nc5 (10...Rb8 11.Bc1–+) 11.h5? (11.Nc4 Qe6 12.Bh3 Ng4 13.Bg4 Qg4 14.Ne5 Qe6=+) 11...h6 (11...Rb8 12.Qc2–+) 12.Nf3? (12.Nc4! Qe6 13.Bh3=+) 12...Ncd7 13.Nc2 e4 14.Nfd4 c5 15.Nf5 Qe6 (15...Qe5!? 16.Nce3 Rb8=+) 16.Bh3= Qe5 17.f4 (better 17.c4!? d4 18.e3=) 17...ef3–/+ 18.d4 cd4 19.cd4 Qe4 20.Kf2 Bd8?? (better 20...fe2 21.Qe2 Qe2 22.Ke2 Re8–+) 21.ef3+– Qe8 22.Re1 (22.Nd6 Qe7 23.Ba3 Ba5 24.Nc8 Qd8 25.Ne7 Kh8+–) 22...Ne4 (22...Nb6 23.Re8 Re8 24.Bc3+–) 23.fe4 Nf6 (23...Ba5 24.Re3 (24.ed5?! Be1 25.Ne1 Nf6+–) 24...g6 25.ed5+– (worse 25.Nh6 Kg7+–)) 24.ed5 Qd7 (24...Ne4 25.Kf3 Ng5 26.Kg2 Bf5 27.Bf5 Be7+–) 25.Nh6! gh6 26.Bd7 Bd7 27.Ba3 Ng4 (27...Re8 28.Re8 Ne8 29.Qb1+–) 28.Kg2 Ba5 29.Bf8 Rf8 (29...Be1 30.Qe1 Rf8 31.Qe7+–) 30.Re7 Nf6 31.Qf3 Kg7 32.Rf1 Ne8 33.Rf7 Rf7 34.Qf7 Kh8 1–0. beatmeeasy (1890) – taher1 (1895), lichess.org, 2021.

5.Bg2 Be7 6.d4 Nbd7 7.Nf3 c6 (7...e4 8.Nfd2–/+) 8.0–0 0–0 9.a4 b6 (9...e4 10.Nfd2–/+) 10.a5 b5 (10...ba5 11.Ra5 e4 12.Nfd2=+) 11.Nbd2 e4 12.Ne1 Ng4 13.e3 (13.h3 Nh6=+) 13...Qg6 14.Qe2 Re8 15.Ra3 Bd6 16.Nc2 Ndf6 17.Rfa1 a6 ½–½. Behrmann,Klaus Juergen – Kessler,Dietmar, compuserve, 1998.

3.Nc3 c6

4.Rb1 e5 5.b5 Nf6=+ 6.e3 Be7 7.h3 0–0 8.Nf3 Nbd7 9.g4 c5–/+ 10.Bg2 e4 11.Nh4 Ne5 12.d4 cd4 13.ed4? Nc4–+ 14.Bc1 Bd8 15.Na4?! Ne8 16.Nf5 Bf5 17.gf5 Qf6 (continuation unknown). Marchukov,D (2125) – Surov,S (2320), Borisoglebsk, 2007.

4.b5 Bf5 5.e3 e5 6.d4 e4 7.a4 Qb4 8.Qc1 Nd7 9.Nge2 Qa5 10.Ba3 Ne7 11.Qb2 Nc8 12.Bf8 Rf8 13.Nc1 Bg4 14.Nb3 Qb4 15.a5 a6 16.Ra4 Qd6 17.ba6 ba6 18.Ne2 f5 19.c4 f4 20.ef4 Qf4 21.Qd2 Qf5 22.Rb4 Ne7 23.h3 Bh5 24.g4 Qf3 25.Rg1 dc4 26.Rg3 Qh1 27.Rc4 Bf7 28.Rb4 Nd5 29.Rb7 Nf4 30.Qf4 Bc4 31.Qe3 Qf1 32.Kd2 0–0–0 33.Rb4 Rf2 34.Kc3 Nf6 0–1. Seifert – Roloff, corr 1984.

4.b5 Nf6 5.e3 e5 6.a4 c5 7.d4 Nbd7 8.a5 Qe6 9.de5 Ne5 10.Nf3 Bd6 11.Be2 0–0 12.0–0 Nf3 13.Bf3 Qe5 14.g3 Bh3 15.Re1 Be6 16.Na4 Qg5 17.Bf6 Qf6 18.Bd5 Bd5 19.Qd5 b6 20.a6 Rfd8 21.Qc4 Rd7 22.Rad1 Rad8 23.Rd3 Bc7 24.Red1 Rd3 25.Rd3 Rd3 26.cd3 h5 27.Qe4 Qd8 28.Nc3 Bd6 29.Qd5 Bc7 30.d4 cd4 31.Qd8 Bd8 32.ed4 f5 33.Nd5 1–0. Kretschmar – Miklcevic, OL 1984.

4.e3 Qb4 5.Rb1 –/+.

4.e3 e5 5.b5 (5.a3 Nf6=+) 5...c5 (5...Nf6 6.Nf3=+) 6.Nge2 (6.Nf3 Nf6=+) 6...Nf6=+ 7.d4 (7.f4 Nbd7=+) 7...cd4 (7...ed4 8.ed4 c4 9.Qd2=+) 8.ed4 e4 9.Ng3 (9.a4 Qc7=+) 9...g6 (9...Be7 10.Be2=+) 10.Be2 (10.f3 ef3 11.Qf3 h5=) 10...Bg7 (10...h5 11.0–0=) 11.0–0 0–0 12.a4 Be6 13.f3 ef3 14.Bf3 Re8 15.Ba3 Qd7 16.Rc1 Bg4 17.Nd5 Bf3 18.Nf6 Bf6 19.Rf3 Qd4 20.Qd4 Bd4 21.Kf1 Bb6 22.c4 Nd7 23.c5 Ba5 24.Rf4 Bd2–/+ 25.Rd1 Bf4 26.Rd7 Bg3 27.hg3 Rab8 28.c6 bc6 29.bc6 Rec8 30.c7= Rb7?? 31.Rd8+– (31.Rd8 Kg7 32.Rc8+–) 1–0. pumpkin (2335) – wstanevans (2230), net–chess.com, 2008.

4.a3 e5

5.d4 e4 6.f3 e3 (6...Nf6 7.g3 a5 8.ba5 Ra5 9.Bg2=) 7.Qd3= g6 (7...Nf6 8.Qe3 Be7 9.Qd2+=) 8.Qe3+– Be6 (8...Ne7 9.Qd2 a5 10.ba5+=) 9.Ne4 (9.Qf2 a5 10.ba5 Ne7+–) 9...Qe7+= 10.Nc5 Bh6 11.Qe5 (11.Qc3 Nf6+=) 11...Nf6 12.Nb7 Qb7 (12...Nbd7 13.Qc7 0–0 14.Qd6 (worse 14.Qc6 Nb6 15.Nc5 Rfc8–/+) 14...Qd6 15.Nd6+–) 13.Qf6 0–0 14.e4 (14.Kf2 Bg7 15.Qf4 a5+=) 14...Bg7 15.Qf4 a5 16.ed5 cd5 17.b5 Rc8 18.Bd3 Bd7 (18...Bf5!? 19.Bf5 gf5 20.Qf5 Re8 21.Kf2 Qb5+=) 19.a4+– Na6 (19...Nc6 20.c3+– (worse 20.bc6 Qb2 21.Qc1 Qc1 22.Rc1 Bc6–/+)) 20.c3 Nc7 21.Qd2 (21.Ne2 Re8 22.Qd2 Ne6+–) 21...Ne6 (21...Ne8 22.c4! dc4 23.Be4+–) 22.Ne2 h5 (22...Re8 23.0–0+–) 23.c4! dc4 24.Be4 Qc7 (24...Qb6 25.Ba8 Ra8 26.0–0+–) 25.Ba8 Ra8 26.0–0 Kh7 (26...h4 27.Rad1 Qb6 28.Rf2+–) 27.f4 Bh6 28.d5 Ng7 (28...Nc5 29.d6 Qb7 30.Qd4+–) 29.Ng3 Nf5 (29...Qc5 30.Kh1 Bf5 31.Ba3+–) 30.Ne4 Bg7 (30...Bf8 31.Be5 Qa7 32.Kh1+–) 31.Bg7 Ng7 (31...Kg7 32.Qc3 Kh6 33.Kh1+–) 32.Qd4 (32.Nf6!? Kh6 33.f5 g5+–) 32...Re8 (32...Rc8+–) 33.Nf6 (33.Nf6 Kh8 34.b6+–) 1–0. bolaf (1965) – eric2800 (1925), gameknot.com, 2017.

5.e3 Nf6 6.Nf3 Bg4 7.Be2 d4 8.Na4 Bf3 9.Bf3 Nbd7 10.d3 b5 11.Nc5 de3 (< 11...Nc5 12.bc5 Qc5 13.ed4 ed4 14.Bd4 Qe7 15.Be3+=) 12.Nd7 ef2 (< 12...Nd7 13.fe3 Be7 14.0–0+=) 13.Kf2 Nd7 14.Re1 f6 15.Kg1 Kf7 16.d4 ed4 17.Bd4 Qc7 18.c4 Bd6 19.cb5 Bh2 20.Kh1 Qf4?? 21.Be3 Qh4 22.Qd7 Kf8 23.Qh3 (23.Qh3 Qh3 24.gh3+–; < 23.Bc6 Bd6 24.Kg1 Qh2 25.Kf1 Rb8+–) 1–0. Skrzypczak,Michal (2100) – Matczyk,Bartosz (2050), Poland–chT2, 2004.

5.e4 d4=+ 6.Nce2 Nf6 7.Ng3 a5 8.Nf3 ab4 9.ab4 Ra1 10.Qa1 h5 11.Bc4 h4 12.Nf5 Bf5 13.ef5 b5 (13...h3 14.g3=) ½–½. Jirousek,Jim – Pech,Jaroslav, corr or01–011 E–mail, 2001.

5.Nf3 Nf6 6.e3 Be7 7.Na4 Nbd7 8.c4 (8.Nc5 0–0=+) 8...0–0 (8...dc4!? 9.Nc3 a5 10.ba5 e4=+) 9.c5 Qc7 10.Be2 Re8 11.0–0 e4 (11...b6 12.d4 ed4 13.Qd4 bc5 14.bc5=) 12.Nd4= Ne5 13.f4 ef3 14.Nf3 Nfg4 (14...Nf3 15.Bf3 b5 16.cb6 ab6 17.Bd4=) 15.Ne5 Ne5 16.Nc3 Be6 17.d4 Ng6 (17...Nd7=) 18.g3 (better 18.Bd3!?=) 18...Bh3=+ 19.e4 (19.Rf3!?=+) 19...Bf1–/+ 20.Qf1 Bf6 21.e5 Be7 (21...Bg5 22.Qf2–/+) 22.Bg4 (22.Qf5 a5–/+) 22...b6 23.Ne2 (23.Qf2 f6 24.Be6 Kh8–/+) 23...bc5 (23...a5 24.Qf5 ab4 25.ab4 Ra1 26.Ba1–/+) 24.bc5–/+ Rab8 25.Bc1 Nf8 (25...f6 26.e6–/+) 26.Nf4 White prepares the advance e6 (26.e6 Ne6 27.Be6 fe6–/+) 26...Qd8 (26...Qa5 27.Be3–/+) 27.Qh3 (27.Qa6=+) 27...Ng6?? (27...Qa5 28.Ne2–+) 28.e6 (28.Ng6 hg6 (28...fg6?! 29.Bd7=) 29.Bf4 Qa5–/+) 28...Nf8 (better 28...Nh8!?–/+) 29.ef7=+ Kf7 30.Be6?? (better 30.Ne6 Qa5 31.Bf4=) 30...Ne6–+ 31.Qe6 Kf8 32.Qc6 Bf6 33.Ne6 Re6! 34.Qe6 Bd4 35.Be3?? (better 35.Kg2 Ba1 36.Bf4 Rb2 37.Kh3–+) 35...Ba1 36.Bf4 (36.c6 Qe7 37.Qf5 Bf6 38.Bd4–+) 36...Rb1 (better 36...Bd4 37.Be3 Rb1 38.Kg2 Rb2 39.Kh3 Be3 40.Qe3 Qc8 41.g4 Qb8 42.Qf3 Ke7 43.Qe3 Kd7 44.c6 Kc6 45.Qc3 Kd6 46.Qg3 Ke6 47.Qb8 Rb8–+) 37.Kg2 Bf6 (37...g6 38.c6 Rb2 39.Kh3–/+) 38.c6 (38.Bd6 Be7 39.Qf5 Kg8 40.Qb1 Bd6 41.cd6 Qd6=+) 38...Rb2–+ 39.Kh3 Qe7?? (better 39...Qe8 40.Bd6 Be7 41.Qf5 Kg8–+) 40.Bd6+– Qd6 (40...Rb3 41.Be7 Be7 42.c7+–) 41.Qd6 Kf7 (41...Be7 42.Qd5 g6 43.Qf3 Kg7 44.Qe4+–) 42.Qd5 Kg6 (42...Ke7+–) 43.c7 h5 44.c8Q h4 (44...Rh2 45.Kh2 Be5 46.Qe5 h4 47.Qce6 Kh7 48.Qh5) 45.Qg4 (45.Qcf5 Kh6 46.Qh5) 45...Kh7 (45...Bg5 46.Qgg5 Kh7 47.Qh5) 46.Qgf5 (46.Qgh5) 46...Kh8 (46...g6 47.Qf7 Bg7 48.Q5g6 Kh8 49.Qgg7) 47.Qc8 (47.Qc8 Bd8 48.Qcd8 Kh7 49.Qh5; 47.Qh5) 1–0. Liszewski,Krzysztof – Zasada,Konrad, OLM, 2007.

5.Nf3 Nf6 6.e3 Bg4 7.Be2 Nbd7 8.0–0 Be7 9.h3 Bf3 10.gf3 Bd8 11.Kh1 e4 12.f4 g5 13.d3 gf4–+ 14.f3 Qe6 15.Kh2 ef3 16.ef4 fe2 17.Ne2 Bb6 18.a4 a6 19.Nd4 Bd4 20.Bd4 0–0–0 21.b5 c5 22.Bf2 a5 23.b6 Qb6 24.Qd2 Qc7 25.Rab1 b6 26.Bh4 Rde8 27.c4 d4 28.Rbe1 Qc6 29.Qd1 Rhg8 30.Bg3 Re1 31.Re1 h5 32.Re2 Kb7 33.f5 Qf3 34.Qe1 Rg3! 35.Qg3 Qe2 36.Kh1 Qf1 37.Kh2 Qf5 38.Qg2 Kb8 39.h4 Ng4 40.Kh1 Nde5 41.Kg1 Qf2! 42.Qf2 Nf2 43.Kf2 Nd3 (43...Nd3 44.Kf3 Ne5 45.Kg3 Nc4–+) 0–1. Penkov,A (2075) – Reshetnikov,Viktor, Chigorin CC, St Petersburg RUS, 2005.

4.a3 Nf6

5.e3 e5 6.Be2 Be7 7.Nf3 Nbd7 8.0–0 0–0 9.d3 Re8 10.Nd2 Nf8 (10...Qe6 11.b5–/+) 11.f4 (11.Na4 Bf5=+) 11...ef4 12.Rf4 Ng6 13.Rf2 Bd8 14.Nf1 Bc7 15.Qd2 (15.Na4 Ne5 16.Bd4 Neg4–/+) 15...Ne5 16.h3 Bd7 17.Na4 b6 18.Bd4 Re7 19.Qc3 Rae8 20.Nc5 (better is 20.Qb3!?–/+) 20...bc5–+ 21.Bc5 Qe6 22.Be7 Qe7 23.Qc5 Qc5 24.bc5 Bc8 25.Rb1 (25.d4 Ng6–+) 25...Ned7 26.d4 Ne4 27.Rb3 (27.Rf3–+) 27...Nf2 28.Kf2 Nf6 29.Bd3 Ne4 30.Be4 Re4 31.Nd2 Re8 32.c4 Ba5 33.Rb2 (33.cd5 Bd2 34.dc6 Bf5–+) 33...Bd2 34.Rd2 dc4 35.Rb2 f5 (36.Rc2 Be6–+) –+. Lava,Giovanni – Jagt,Aaron, corr or02–021, 2003.

5.e3 e5 6.Nf3 Be7 7.d3 (7.Be2 0–0=) 7...0–0 8.Be2 a5 9.Na2 (9.0–0 b5=+) 9...Nbd7–/+ 10.c4 b6 11.Qc2 (11.0–0 Rd8=+) 11...Re8 (11...dc4 12.Qc4 ab4 13.Nb4=+) 12.0–0=+ Bb7 (12...dc4 13.dc4 Rd8 14.Rfd1=) 13.d4= e4 (13...ab4? 14.de5 (14.Nb4?! e4 15.Nd2 Qe6=; 14.ab4?! e4 15.Nd2 Ba6=+) 14...b3 15.Qb3+– (15.ed6?! bc2 16.de7 dc4+–)) 14.Ne5 Qe6 (14...Bc8 15.c5 bc5 16.dc5=) 15.cd5 cd5 (15...Qd5? 16.Bc4 Qd6 17.Bf7 Kf8 18.Nc4+–) 16.Qc7 Ba6 17.Ba6 Bd6?? (better is 17...Ra6 18.Rfc1 Bd6=+) 18.Qb7+– Reb8 19.Qc6 Ra6 20.Qb5 (20.b5 Ra7 21.Rfc1 Rc7 (21...Ne5? 22.de5 Ba3 23.Qe6 fe6 24.Ba3+–; < 21...Be5 22.de5 Ng4 23.Rd1=) 22.Qc7 Bc7 23.Rc7 Ne5 24.de5 Ng4–/+) 20...Raa8 (20...Rba8 21.Nc6–/+) 21.Nd7 Nd7 22.Rac1 Nf6 23.Rc2 h5 24.Rc6 h4 25.Nc3 Rd8 26.Rc1 Qf5 27.h3 g5 28.Rb6 g4 29.hg4 Qg4 30.ba5 Kh7 31.Kf1 Qf5 32.Rc2 Rac8 33.a6 Ng4 34.Ke1 Rc4 35.Re2 Nf2? 36.Qd5 Nd3 37.Kd2 Qd5 38.Nd5 f5 39.a7 Ra4 40.Rb7 Kg6 41.Nb6 Ra7? 42.Ra7+– Nb2 43.Ra6 Kg5 44.Re1 Rb8 45.Rc1 Ba3 46.Nd5 Nd3? 47.Ra3 Nc1 48.Kc1 Kg4 49.Nf4 Kg3 50.d5 Kf2 1–0. Sitak,J – Mroczek,J, corr Poland, 1996.

4.b5 d4

5.Nb1 e5 6.e3 c5 7.ed4 ed4 8.Nf3 Be7 9.Na3 a6 10.Bc4 Nf6 11.0–0 0–0 12.Re1 Bg4 13.h3 Bh5 14.Be2 ab5 15.Nb5 Qd7 16.Ne5 Qb5 17.Bb5 Bd1 18.Red1 Na6 19.c3 Nc7 20.Bc4 dc3 21.dc3 b5 22.Bf1 Ra6 23.a4 Ra4 24.Ra4 ba4 25.Nc6 Re8 26.Ne7 Re7 27.Ra1 h5 28.Ra4 Ne6 29.Bd3 Re8 30.g3 Rd8 31.Bf1 g5 32.Ba3 Nd5 33.c4 Nc3 34.Ra5 Ne4 35.Bg2 Rd4 36.Be4 Re4 37.Bc5 f6 38.Be3 Rc4 ½–½. Kretschmar – Roth, corr 1985.

5.Ne4 Qb4 6.bc6 Nc6 (6...Qb2? 7.Rb1 Qa2 8.cb7 Bb7 9.Rb7) 7.Qb1 e5 8.Nf3 f5 9.Ng3 f4 10.c3 dc3 11.dc3 Qa5 12.Ne4 Bf5 13.Nf6 (13.Nfd2) 13...Nf6 14.Qf5 Ba3 15.Qe6 Ne7 16.Qb3 Bb2 17.Qb2 0–0 18.e3? (18.Qb4) 18...fe3 19.Bc4 Kh8 20.fe3 Ned5 0–1. van den Braak – Rudbeck, corr 3GMM½–03 1997–98.

5.Ne4 Qd5 6.Ng3 cb5 7.Nf3 Nc6 8.e4 Qc5 9.Ne2 e5 10.c3 dc3 11.Nc3 a6 12.Nd5 Qd6 13.Rc1 Nge7 14.Be5 Ne5 15.Nc7 Kd8 16.Na8 N7c6 17.Ne5 Qe5 18.Qf3 f5 19.Bd3 Ba3 20.Rd1 Re8 1–0. Romischke – Pleschke, 1996.

3.Nc3 e5

4.a3 a5 5.e3 Nf6 6.Be2 (6.Nf3 c6=) 6...c6 (worse 6...ab4 7.Nb5 Qe7 8.ab4+=) 7.Nf3 e4 8.Nd4 ab4 9.ab4 Ra1 10.Qa1 Qb4 11.Nb3 (11.0–0 Bd6=) 11...Be7 (11...Nbd7 12.0–0=+) 12.Nb1 (12.Qa7 Nbd7=+) 12...Nbd7 13.0–0 Qb6 14.d4 (14.Nc3 Nc5 15.Na4 Na4 (worse 15...Nb3 16.Nb6 Na1 17.Ra1+=) 16.Qa4 0–0=+) 14...ed3–/+ 15.Bd3 0–0 16.N1d2 Qc7 17.Nf3 Re8 18.Rd1 Bd6 19.Bf5 (19.h3 b5–/+) 19...Ne5–+ 20.Bc8 Nf3 21.gf3 Qc8 (21...Rc8?! 22.Bf6 gf6 23.Qf6 Bh2 24.Kh1=; 21...Bh2?! 22.Kg2 Rc8 23.Rh1=) 22.Bf6 (22.Kg2 Re6 23.Rg1–/+) 22...Qh3 (22...gf6?! 23.Qf6 Qh3 24.Qg5 (24.Qd6? Re6 25.Qb8 Kg7–/+) 24...Kf8 25.Qg2=+) 23.f4 (23.Bg7?? Bh2 24.Kh1 Bg3 25.Kg1 Qh2 26.Kf1 Qf2) 23...Re6 (23...gf6?! 24.Nd4–/+) 24.Bg5 (24.Bh4 Qh4 25.Qa8 Bf8–+) 24...h6 25.Kh1 hg5 26.Rg1 Rg6 27.Rg3 Qf5 28.Qa4 (28.Nd4 Qe4 29.Kg1 gf4 30.ef4–+) 28...Qc2 29.Qa8 (29.Kg2 gf4 30.ef4 Kh7 31.Rg6 Qg6 32.Kf1 Qb1 33.Kg2 b5–+) 29...Bf8 30.Qb7 (30.Nd4 Qe4 31.Kg1 gf4 32.Rg6 Qg6 33.Kf1 Qd3 34.Kg2 fe3 35.fe3 Qe3–+) 30...Qf2 31.Qa6 (31.Nd4 gf4 32.Rg6 fg6–+) 31...Rh6 32.Rg2 Qe1 33.Rg1 Qe3 34.fg5 (34.Rg5 Qb3 35.Qe2 Bd6–+) 34...Rh3 (34...Qb3?! 35.gh6 g6 36.Qa8=+) 35.Nd4 Qe4 36.Rg2 Qd4 (36...Qd4 37.Qe2 Re3 38.Qf1 Qe4 39.Kg1 Bc5 40.Qf7 Kf7 41.Rf2 Kg8 42.Rf8 Kf8 43.h3 Rh3 44.Kf1 Rh1) 0–1. bolaf (2010) – qphys8 (1965), gameknot.com, 2017.

4.a3 d4 5.Ne4 Qc6 6.Ng3 =.

4.a4 c6 5.b5 Be7 (5...Nf6 6.e3=+) 6.a5 (6.Ba3 Qe6=+) 6...d4–/+ 7.Ba3 (7.Na2 cb5 8.e3 a6–/+) 7...Qg6 8.Na4 (8.Nb1 cb5 9.e3 b4–+) 8...cb5–+ 9.Nc5 (9.Be7 Ne7 10.Nc5 Qc6–+) 9...Nc6 10.Nb3 (10.Nd3 Ba3 11.Ra3 e4–+) 10...Bf5 11.d3 Ba3 12.Ra3 Nge7 (12...Qd6 13.Ra1–+) 13.Qd2 (13.e3 Qd6 14.Ra1 0–0–+) 13...Rc8 14.Nf3 0–0 (14...Qd6 15.Ra2–+) 15.e3 Qd6 (15...Rfe8 16.a6 b6 17.Ra1–+) 16.Ra2 Rc7 (16...Be6 17.a6 b6 18.Rb2–+) 17.ed4 (17.Be2 Rfc8 18.Rb2 Qa3–+) 17...Nd4 (17...ed4 18.Be2–+) 18.Nbd4 ed4 19.Be2 Rfc8 (19...Re8 20.0–0–+) 20.0–0 a6 (20...Qf6 21.Re1–+) 21.Rfa1 (21.Rb2 Rc3–+) 21...Rc3 (21...Nc6 22.Rb2–+) 22.Ne1 (22.Rb2 Nc6–+) 22...Be6 23.Rb2 R8c5 (23...Ra3 24.Rbb1–+) 24.Bf3 Nc6 (24...Nd5 25.Bd5 Bd5 26.Qe2–+) 25.g3 (25.Be4 Nd8–+) 25...Qc7 26.Bc6 (26.Be4 Bf5–+) 26...bc6 (26...Rc6 27.Qe2–+) 27.Nf3 Qd8 28.Qe2 (28.Rb4 Rc2 29.Qf4 R2c3–+) 28...Bg4 29.Re1 (29.Raa2 Qc8 30.h3 Be6–+) 29...Kf8 (29...f6 30.Qe4 Bf3 31.Qf3 Rc2 32.Rc2 Rc2 33.Qg4–+) 30.h3 (30.Rb4 Rd5–+) 30...Bf3 (30...Bh3?! 31.Nd4 Bd7 32.Qe4–/+) 31.Qf3 Rc2 (31...Qa5?? 32.Qe4 Re5 33.Qe5+–) 32.Rc2 Rc2 33.Qe4 g6 34.Qe5 Threatening mate: Qh8 34...f6 35.Qe6 (35.Qf4 Kf7–+) 35...Rc3 36.g4 (36.Kf1 h6–+ (36...Rd3 37.Qc6 Rc3 38.Qa6=)) 36...Kg7 37.h4 (37.Kg2 b4–+ (37...Qa5?? 38.Qe7 Kg8 39.Qe8 Kg7 40.Re7 Kh6 41.Qf8 Kg5 42.f4 Kf4 43.Qf6)) 37...Rd3 (better 37...Kh6!?–+) 38.Qc6–/+ Rc3 39.Qb7 (39.Qa6 d3 40.Qb7 Rc7–+) 39...Rc7–+ 40.Qa6 Qd7 (40...d3 41.Qb5 d2 42.Rd1–+) 41.Qe6 (41.g5 fg5 42.hg5 Qg4 43.Kf1 Qh3 44.Kg1 Qf5–/+) 41...Qe6 (41...d3 42.Qd7 Rd7 43.Rd1–+) 42.Re6–/+ Kf7 43.Rd6 Rc4 44.f3 (44.Kf1 Ra4–/+) 44...Ra4 (44...Ke7 45.Rb6 d3 46.Kf2=+) 45.a6 Ke7 (45...h6 46.Kf2 g5 47.h5=+) 46.Rb6 Ra2 (46...b4 47.Kf1=+) 47.Kf1=+ d3 48.Ke1 b4 (48...h5 49.gh5 gh5 50.Rb5 Ra6 51.Kd2=) 49.Rb4= Ra6 (49...Ke6 50.Rb3=) 50.Kd2 Rd6 51.Rb7 Rd7 ½–½. Kretschmar,Bernd – Weiner,Milan, corr ICCF EU–chT3 fin, 1978.

4.a4 Bf5 5.Nf3 Nc6 6.Nh4=+.

4.e3 c6 =.

4.e3 Nd7 5.Nf3= Ngf6 (5...a6 6.b5=) 6.Nb5 Qc6? (better 6...Qb6!? 7.Ne5 Bb4+=) 7.Ne5+– Qb6 8.Bd4 c5 9.Nd7 Bd7 10.bc5 (10.Bf6 gf6 11.Nc3 d4+–) 10...Bc5+– 11.Bf6 gf6 12.Rb1 0–0–0 (12...Qc6 13.Qf3 a6 14.Nc3+–) 13.d4 Be7 14.c4 a6 (14...Qa5 15.Qd2 Qd2 16.Kd2+–) 15.Nc3 Bb4 16.Ke2 Bf5 17.Rb2 dc4 18.Qa4 a5 19.a3 Rhe8 20.Kf3 (20.ab4 Qd4 21.Nd1–/+) 20...Bd7= 21.Rb4 (21.Qc2 Qe6 22.h3 Bc6 23.Ke2 Ba3–/+) 21...Bc6 22.d5 ab4 23.dc6 bc3 24.Bc4 bc6 (24...Re5 25.Bf7 Rd2 26.Qa8 Kc7 27.Qb7 Qb7 28.cb7–/+) 25.Bf7 (25.Qc2 Qc5 26.Ba6 Kc7 27.Qh7 A) 27...Qa3?! 28.Bc4= (worse 28.Qf7 Re7 29.Qf6 Rdd7 30.Qf4 Kb6 31.Qb8 Ka6 32.Qa8 Ra7 33.Qc6 Ka5–/+); B) 27...c2–+) 25...Re5 (25...Re7 26.Qc4+=) 26.Rc1 Rf5 (26...Rd3 27.Qg4 Kb7 28.Qf4=) 27.Kg3 Kb7 (27...Rg5 28.Kh3 Qc5 29.Be6 Kc7 30.Qf4 Qe5 31.Rc3 Qf4 32.ef4 Ra5=) 28.Rc3+– Rb5 (28...Ra5 29.Qc4+–) 29.Qc4 (29.Kh3 Qc7 30.Qe4 Qd7 31.Be6 Rh5 32.Kg3 Qd6 33.f4 Re8 34.Qb1 Rb5+–) 29...Rd2 30.Kh3 Qc7 31.f4 Rb6 32.Rb3 Rb3 33.Qb3 Qb6 34.Qe6 Qb2 (34...Qc5!?+=) 35.Qe7+– Kb6 36.Qf8 Kc7 (36...Qc3!? 37.Qb8 Ka6+=) 37.Be6+– Re2 (37...Kb7!?+–) 38.Qc8+– Kb6 39.Qb8 Kc5 40.Qa7 Kd6 41.Bg4 Rd2 (41...Re1 42.Qd7 Kc5 43.Bf3+–) 42.Qh7 Qc3 43.Kh4 Qb2 (43...Kc5 44.Qa7 Kd6 45.Qf7+–) 44.Qd7 Kc5 45.Qa7 Kd6 46.Bh3 Qc3 47.e4 Qd4 48.Qf7 (48.Qa8 Kc7+–) 48...Kc5 49.Kh5 (49.Qc7 Rd3 50.Qa5 Kd6+–) 49...Qe4 50.Qf6 Rd5 51.f5 Qe8 52.Kh4 Rd3 (52...Qe4 53.Bg4+–) 53.Bg4 Ra3 54.Bf3 Rd3 55.Qg7 Rd4 (55...Qb8 56.Kg5 Rf3 57.gf3 Qh2 58.Qe7 Kd5 59.Qe6 Kc5 60.f6 Qg2 61.Kh6 Qh2 62.Kg7 Qg3 63.Kf8 Qb8 64.Qe8+–) 56.Kg5 Qe3 57.Kg6 Qe8 58.Qf7 Qf7 59.Kf7 Kd6 60.f6 Rf4 61.Kg7 Ke6 62.h3 Rf6 63.Bc6 Rf7 64.Kg6 Rf6 65.Kg5 Rf5 66.Kh4 (66.Kh6 Rf6 67.Kh7 Rf2+–) 66...Rc5 (66...Ke5 67.Bf3+–) 67.Bb7 (better 67.Bf3!?+–) 67...Rc7 68.Bf3 Ke5 (68...Kf5 69.Bg4 Kf6 70.Bd1+–) 69.Kg5 Rc8 70.Kg6 (70.Bh5 Rc3 71.Kh6 Rc6 72.Kg7 Rc7 73.Kg8 Rc8 74.Kf7 Rc7 75.Ke8 Rh7+=) 70...Rh8 71.Kg7 Rh4 72.Bb7 Kf4 73.Kg6 Kg3 74.Kf5 Rh3 75.Ke5 Rh5 76.Kd4 Kf4 77.Be4 Rb5 78.Bc6 Rb1 79.Bf3 Re1 80.Bb7 Rd1 81.Kc5 Ke5 82.Kc4 Rd4 83.Kc3 Rd6 84.Kc2 Rd7 85.Bf3 Kd4 86.Kb2 Rc7 87.Be2 Rc3 88.Bf1 Rg3 89.Kc2 Ke3 90.Kc3 Rg4 91.Kb3 Kf2 92.Bc4 (92.Bb5 Rg2 93.Kc4 Ke3=+) 92...Rg2 93.Bd5 Rg4 94.Kc3 Ke3 95.Bc6 Rd4 96.Bg2 Rd2 97.Bc6 Rd6 98.Bb5 Ke4 99.Kc4 Ke5 100.Kc3 Rd8 101.Bc4 Rd7 (101...Rd1 102.Kc2=+) 102.Bb5 Rd6 (102...Rc7 103.Kd3=+) 103.Kc4 Rd2 104.Kc3 Rd4 105.Bd3 Rf4 106.Bb5 Kd5 107.Be2 Rd4 108.Ba6 Ke4 109.Bf1 (109.Bb7 Ke5=+) 109...Rd1 110.Bg2 Ke5 111.Kc4 Rd6 112.Bf3 Rd8 113.Bb7 (113.Kc3 Rf8 114.Be2 Ra8=+) 113...Rd2 114.Bf3 Rd6 115.Kc3 Rd4 116.Be2 Re4 (116...Rh4 117.Bd3=+) 117.Kd3 Rf4 118.Kc3 Rh4 119.Bf1 Rg4 120.Be2 Rg7 121.Kd3 Rf7 122.Kc4 Rf6 123.Kd3 Rf8 124.Ke3 Rf7 (124...Ra8 125.Bf3=+) 125.Bf3 Rf4 126.Ke2 Rh4 127.Bg2 Rh2 128.Kf3 Kd4 129.Kg3 Rh6 130.Kf3 Rg6 131.Kf2 Rg7 132.Bf3 Rg5 133.Bg2 Rg6 134.Kf3 Rg7 135.Kf2 Rg8 (135...Ke5 136.Kf3=+) 136.Kf3 Re8 137.Kf4 Re7 138.Kg4 Re6 139.Kf5 Re3 140.Kf4 Re5 (140...Re2 141.Bf3=+) 141.Bf3 (141.Kf3 Rf5 142.Kg4 Rf2=+) 141...Re6 (141...Re1 142.Bg2=+) 142.Kf5 Re7 ½–½. Bambinik – Freejack, internet, 2002.

4.a3 c6

5.d4 e4=+ 6.e3 Ne7 7.Nge2 Ng6 (7...b5 8.Qd2=+) 8.Ng3 Be7 (8...Qe6 9.Na4=+) 9.Be2= 0–0 10.0–0 f5 11.f4 (11.f3 b5=+) 11...b5 (11...Bh4 12.Qe1=+) 12.Qd2 Nd7 (12...a5 13.ba5 Qc7 14.Bh5=+) 13.Rfd1 (13.a4 ba4 14.Ba3 Qe6=) 13...Qc7 (13...Nb6 14.a4 a6 15.ab5 cb5 16.Na2=+) 14.Bh5 (14.a4 Bb4 15.ab5 cb5 16.Nd5 Bd2 17.Nc7 Be3 18.Kh1 Rb8 19.Ra7 Nf4 20.Bb5 Nf6=) 14...Nb6=+ 15.Be2 Bd7 16.Rf1 (16.Rab1 Qd6=+) 16...Rae8 (16...Rfd8 17.Rfd1=+) 17.Rfd1 Bd6 18.Rf1 Re7 19.Rfd1 Nf4 (19...Be6 20.Rf1=+) 20.ef4= Bf4 21.Qe1 Bg3 22.Qg3 f4 23.Qh4+= Re6 24.Rf1 Rh6 25.Qf2 f3! 26.g3 Rff6 27.Bd1=+ Nc4 28.Bc1= Rhg6 29.Re1 Nd6 30.Kh1 Bh3 31.Bf4 Bg2 32.Kg1 Rg4 33.Be5+/– Rh6 34.Bf4 Rh5 (34...Rf6!?=) ½–½. Gall,Zdenek – Wolszczak, corr 3GMM–26, 1997.

5.d4 e4=+ 6.e3 Nf6 7.Nge2 =+.

5.d4 e4 6.e3 Nh6 7.Nge2 Bg4 8.Qd2 Nd7 9.Na4 Be7 10.h4 (10.c4 dc4 11.Nc5 Nc5 12.bc5 Qd7=) 10...0–0 11.Nf4 Nf5 12.h5 b5 13.Nc5 Nc5 14.dc5 Qh6 15.Be2 Be2 16.Ne2 Bf6 17.Bf6 Qf6 (worse is 17...gf6 18.a4 ba4 19.Ra4+=) 18.c3 a5 19.0–0 Qg5 20.Nf4 g6 (20...Rfd8 21.Qc2–/+) 21.Qe2 Qf6 22.Qc2 g5 23.Ne2 ab4 24.ab4 g4 25.g3 Qg5 26.Kg2 (26.Nf4 Ng7–/+) 26...Qh5 (26...Qe3! 27.Rfe1 Qh6–+) 27.Rh1–/+ Qg5 28.Nf4 Ra1 29.Ra1 h5 30.Qa2 h4 31.gh4 Nh4 32.Kg3 Nf5 33.Kg2 g3 34.Rg1 Kg7 35.Qa7?? (better is 35.Kf1 Rh8 36.fg3 Ne3 37.Ke1–+) 35…Qg4 (35...Qg4 36.Qb8 Rb8 37.Rh1 Qf3 38.Kh3 gf2 39.Kh2 Qg3) 0–1. Emohisi – Abc123, playchess.de, 2002.

5.e3 Nf6 =.

4.e3 Nf6

5.a3 (--> 1.b4 d5 2.Bb2 Qd6 3.a3 e5 4.e3 Nf6 5.Nc3).

5.Nb5 Qe7 6.a3 c6 7.Nc3 c5 (7...Bf5 8.Nf3=+) 8.bc5= Nbd7 (8...Qc5 9.Nf3 Bd6 10.d4 ed4 11.Bb5 Bd7 12.Nd4=) 9.Na4 Ne4 (9...b6 10.c6 Nc5 11.Nc5 bc5 12.Nf3+=) 10.Bb5+= Qg5 (10...f6+=) 11.g3 (11.Qf3 Be7+=) 11...Qf5 (11...Nec5 12.Nf3 Qe7 13.Be5 Ne4+/–) 12.Nf3+= d4? (better is 12...f6+=) 13.ed4+– ed4 14.Qe2 Qg6 (14...Be7 15.Nd4 (15.Bd4?! 0–0+–) 15...Qd5 16.c4 Ng3 17.cd5 Ne2 18.Ne2+– (< 18.Be2 Nc5 19.Nc5 Bc5+–)) 15.d3 (better is 15.Ne5 Qf5 16.Bd4+–) 15...a6 16.Ne5 (16.Qe4 Qe4 17.de4 ab5+–; 16.de4 ab5 17.Nb6 Nb6 18.cb6 Qb6 19.Bd4 Qa5 20.Nd2 Qa4+/–) 16...Qe6 17.Bd7 (17.Qe4 ab5 18.Nd7 Qe4 (18...Bd7?! 19.Qe6 Be6 20.Nb6=) 19.de4 Bd7+/–; 17.de4 ab5 18.Nd7 A) 18...Qd7?? 19.Nb6 d3 20.cd3+– (20.Nd7?! de2 21.Nb6 Rb8+–); B) 18...Bd7+/–) 17...Bd7 18.Nd7 (18.Qe4?! Ba4 19.Bd4 Bc2+–; 18.de4 Qe5 19.Nb6 Bb5=+) 18...Kd7 (18...Ng5 19.Qe6 fe6 20.f4 Kd7 21.fg5+–) 19.Nb6 (< 19.Qe4 Qe4 20.de4 Re8+–) 19...Kc6 20.Na8 (20.Qe4?! Qe4 21.de4 Re8+–; < 20.de4 Rd8+–) 20...Nc3 21.Bc3 dc3 22.Qe6 fe6 23.Nb6 Bc5 24.Nc4 b5 25.Ne5 Kd5 26.f4 Re8 27.Ke2 Bd6 28.Ng4 e5 29.Ne5 Be5 30.fe5 Re5 31.Kf3 a5 32.Rae1 Rf5 33.Kg2 Rg5 34.Re8 Kc5 35.Rc8 Kd4 36.Rc7 h6 37.Rb1 Rf5 38.Rg7 Kc5 39.Rb3 Re5 40.Rc3 Kd4 41.Rc6 h5 42.Rd7 Ke3 43.d4 Re4 44.Rc5 h4 45.Re5 hg3 46.hg3 b4 47.a4 b3 48.cb3 Kd3 49.Kf3 Re5 50.de5 Kc3 51.e6 Kb3 52.e7 Ka4 53.Rb7 Ka3 54.e8Q a4 55.Ke4 Ka2 56.Qa4# 1–0. Sargon – Greif , 1994.

5.Nb5 Qe7–/+ 6.a3 c6 7.Nc3 Qc7 8.Nf3 Bd6 9.h3 0–0 10.d3 (10.Be2 Be6=+) 10...b5–/+ 11.Be2 a5 12.ba5 (12.0–0 h6–/+) 12...Ra5 13.0–0 Nbd7 14.a4 b4 15.Nb1 c5 (15...e4 16.Nd4 Nc5 17.Nb3 Ra4 18.Nc5 Ra1 19.Ba1 Bc5 20.Nd2–/+) 16.c3 Nb6 17.cb4 cb4 18.Nbd2 (18.Qb3 d4 19.Rc1 Rc5 20.Rc5 Bc5 21.ed4 ed4=) 18...Bd7 19.Nb3 (19.Qc1 Qb8–/+) 19...Ba4 20.Qd2 (20.Rc1 Qe7–+) 20...Raa8–+ 21.Rfc1 Qe7 22.Bd1 Rfd8 23.Ra2 Bd7 24.Na5 Rdc8 25.Rca1 Be8 (25...e4 26.de4 Ne4 27.Qd4–+) 26.Bb3–/+ Bb5 27.Nh4 Qd7 28.g4 Re8 (28...Qe6!?–/+) 29.Nf5 Bf8 30.f4 ef4 31.ef4 Qe6 (31...h5!? 32.Bf6 gf6=+) 32.Nd4=+ Bc5 33.Nb7 Ra2 34.Ra2 Bd4 35.Bd4 Nbd7 36.Kh2 h6 37.Nc5 Qd6 (37...Nc5 38.Bc5 Bd7 39.Qg2=+ (39.Qb4? h5–+; 39.Bb4? h5–+)) 38.Nd7= Nd7 39.Kg2 Rb8 40.Qe3 Bc6 (40...Rc8 41.f5=) 41.Ra6 Qc7 42.Qe7 Qc8 ½–½. Fournier,Frederic (2040) – allezcparti (2100), echecsemail.com, 2004.

5.Nf3!? a6 6.a3=+.

3.Nc3 Nf6

4.a3 e5 5.e3 a6 6.h3 Nc6 7.d4 e4 8.g4 Be7 9.Nge2 0–0 10.g5 Nd7 11.Nf4 Nb6 12.Rg1 f5 13.h4 Nd8 14.h5 Ne6 15.Ne6 Be6 16.h6 g6 17.f4 Qc6 18.Be2 Rfd8 19.b5 ab5 20.Bb5 Qd6 21.Rb1 Bd7 22.Bc1 Bb5–+ 23.Nb5 Qc6 24.c3 Nc4 25.Qb3 Qd7 26.a4 Ra6 27.Kf2 Rda8 28.Nc7 Qc7 29.Qb7 Qb7 30.Rb7 Kf7 31.Rb5 Ra4 32.Rd5 Ra2 33.Kg3 Re2 34.Kh4 Raa2 35.Kh3 Bd6 36.Kg3 Ne3 0–1. Bortkun,Wojciech (1795) – Walczak,Arkadiusz (1970), Poland, 2002.

4.Nb5 Qd7=+ 5.e3 Nc6 (5...a6 6.Nd4=+) 6.Nf3 (6.a3 a5=) 6...Nb4 (6...a6 7.Nbd4=+) 7.Be5= Na6 8.Bd4 (8.Nbd4!?=) 8...c5=+ 9.Be5 Ng4 10.c4 f6 11.Bg3 e6 12.Rb1 Qd8 13.Qc2 f5 14.cd5 ed5 15.Qa4 Bd7 16.Qf4 Bc8 17.Bh4 Qd7 18.Qa4+= Qc6? 19.h3+– Nf2 20.Ne5 (20.Ne5 Nh1 21.Nc6 bc6 22.Nd6 Kd7 23.Nc8+–; 20.Kf2 Be7 21.Nd6 Bd6+–; 20.Bf2 Kd8+–) 1–0. jnunes (1985) – Anna_Goldberg (1820), internet, 2007.

4.Nb5 Qd8 5.Nf3 c6 6.Nbd4 e6 7.a3 Bd6 8.Nb3 Nbd7 9.e3 e5 10.Be2 0–0 11.0–0 e4 12.Nfd4 Ne5 13.f4 Neg4 14.Rc1 Nh6 15.c4 Qe7 16.cd5 Nd5 17.Qc2 Ng4 18.b5 Ngf6 19.bc6 Ba3 20.Ba3 Qa3 21.cb7 Bb7 22.Nc5 Ne3 23.de3 Qe3 24.Kh1 Qd4 25.Nb7 Qb4 26.Rb1 Qe7 27.Rfd1 Rab8 28.Nd6 Rb1 29.Qb1 Rd8 30.Bc4 Qc7 31.Nb5 Qa5 32.Na7 Rd1 33.Qd1 Ng4 34.Nc6 Nf2 35.Kg1 Nd1 36.Na5 g6 37.Bb3 Nc3 38.Kf2 Kg7 39.Ke3 f5 40.Nc6 Nb5 41.g3 h6 42.h4 Kf6 43.Ne5 Nd6 44.Nd7 Ke7 45.Nb6 Kf6 46.Bd5 Ke7 47.Nc4 Nc4 48.Bc4 h5 49.Bb3 Kf6 50.Kd4 Kg7 51.Ke5 Kf8?? 52.Kf6 e3 53.Bd1 Ke8 54.Kg6 Ke7 55.Kf5 Kf7 56.Ke5 Ke7 57.f5 Kf7 58.Bh5 Kg7 59.f6 Kf8 60.Ke6 Kg8 61.Ke7 Kh7 62.f7 e2 63.Kf6 Kh6 64.Bg6 e1Q 65.f8Q# 1–0. Zarkov (2520) – Gromit (2380), SKQ, 1999.

4.Nf3 Qb4–/+ 5.Rb1 a6 6.g3 Nc6 7.Bg2 d4 8.0–0? (better is 8.a3 Qa5 9.Na2–/+) 8...dc3–+ 9.Bc3 Qd6 10.d3 e6 11.Qd2 Be7 12.e4 e5 13.Rfe1 Bg4 (13...0–0 14.d4 ed4 15.Nd4–+) 14.Nh4 (14.Rb7 Nd7 15.Qe3 Nb6–+) 14...b5 (14...Rb8 15.h3 Be6 16.Nf5 Bf5 17.ef5–+) 15.Nf5 Qd7 (better is 15...Bf5!? 16.ef5 0–0 17.Bc6 Qc6 18.Be5–+) 16.Ng7 Kd8 17.f3 (17.Nf5 Bc5–+) 17...Bh3 (17...Rg8!? 18.Qh6 Qd6 19.d4–+) 18.Bh3 Qh3 19.Qf2 Nd7 20.Nf5 Bc5 21.Ne3 Rg8 22.Qg2 Qh6 (22...Qh6 23.Bd2 Qe6–+) 0–1. alexp (2405) – ramesis (2175), net–chess.com, 2013.

4.Nb5 Qb6

5.a4 c6 6.Bd4 Qd8 7.Na3 e6 8.c3 Bd6–/+ 9.Nf3 Nbd7 10.d3 e5 11.Be3 0–0 12.Nc2 Re8 13.Bg5 h6 14.Bh4 Qc7 15.e3 a5 16.Be2 g5 17.Bg3=+ Nb6 18.0–0 Nh5 19.Be5+= g4 20.Bd6+/– Qd6 21.Nfd4 f5 22.Nb3 ab4 23.a5 Nd7 24.cb4 Ndf6 25.Nc5 f4 26.d4 Re7 27.Nd3 Rg7 28.ef4 Nf4 29.Nf4 Qf4 30.g3 Qd6 31.Bd3 Ne4 32.Re1 Bf5 33.Ne3 Be6 34.Be4 de4 35.d5 cd5= 36.Qd4 Rd8 37.Rac1 Kh7 38.Rc5 b6 39.Rb5 ba5 40.Rb6 Qe7 41.ba5+= Rf7? 42.a6 Rd6+= 43.Rd6 Qd6+– 44.a7 Qc6 45.Rb1 Bc8 46.Rb8 (46...Ra7 47.Qa7 Qd7 48.Qc5+–; 46.Nd5?! e3 47.Ne3 Bb7 48.Qd3 Kg7 49.Nf5 Rf5 50.Rb7 Qb7 51.Qf5 Qa7 52.Qg4 Kf6+–) 1–0. Kretschmar,Heinz – Blodig,Reinhard, corr IV Ostsee Meer, 1982.

5.a4 Nc6 6.e3 Nb4 7.Be5 =.

5.e3 c6 6.Bd4 Qd8 7.Na7? (better is 7.Nc3!?=) 7...Bg4–/+ 8.f3 Bh5 (8...Bd7!?–/+) 9.b5 (9.g4 Bg6 10.h4 Nfd7=) 9...e5 10.bc6? (10.Be5 Ra7 Deflection) 10...bc6 (better is 10...ed4!? 11.c7 Qc7–+) 11.Nc6+= Nc6 12.Bb5 ed4 (better is 12...Qc8!? 13.Be5 Nd7+=) 13.Bc6+= Nd7 14.Ba8 Qa8 15.ed4 Be7 16.Ne2 0–0 17.0–0 f5 18.Nf4 Bf7 19.Qe2 Bd6 20.Nh3 Qa7 21.Kh1 (21.c3!?+=) 21...Qd4+= 22.c3 Qf6 23.a4 Re8 24.Qb5 Be6 25.f4 Rb8 26.Qc6 Rb6 27.Qc8 Nf8 28.Qa8 Rb8 (28...Rb2 29.Qa6 Qe7 30.Qd3=) 29.Qa6 Bc8 30.Qd3 Bb7 31.Rfb1 Ne6 32.g3?? (better is 32.Rb7 Rb7 33.Qd5+–) 32...Nc5 33.Qd4 Qf8 34.Kg1 Nb3!–/+ 35.Qe3 Na1 36.Qe6+= Kh8 37.Ra1? Re8 38.Qd7 Qe7 39.Qf5? Bc5–+ 40.Nf2 Qe2 41.d4–/+ Bf8 42.Qd7 Qc4?? 43.Qb5 Ra8?? 44.Ng4?? Qc7 45.Qb3+= Bc6 46.Ne5 Rb8 47.Qc2 Be8 48.Kf2 Qa5 49.Qf5 Bd6–+ 50.Qc2 Rc8 51.Rc1 Bb4?? 52.c4?? dc4–+ 53.Nc4 Qa4?? 54.Qa4–/+ Ba4 55.Ke3 Bb5 56.Kd3 Kg8 57.d5 Kf8 58.Kd4 Bc4 59.Rc4–/+ Rc4 60.Kc4 Be1 61.Kc5 Ke7 62.Kc6 Bb4 63.g4? Bd6–+ 64.f5 Bh2 65.Kc5 Kd7 66.Kd4 Kd6 67.Ke4 Be5 68.Kf3 h6 69.Ke4 Bf6 70.g5 hg5 71.Kf3 Kd5 72.Kg4 Kd6 73.Kh5 Ke5 74.Kg4 Be7 75.Kh5 Kf4 76.Kg6 g4 77.Kf7 Ba3 78.f6 gf6 79.Kf6 (79.Ke8 g3 80.Kd7 g2 81.Kc8 g1Q 82.Kb7 Qc5 83.Ka6 Qc6 84.Ka7 Qb5 85.Ka8 Qa6 86.Kb8 Bd6) 0–1. Schmidt,Kristian – Fjellheim,Marius, Tromsoe Bymesterskap–B, 2007.

3.e3 Qb4

4.a3 Qb2 5.Nc3 e6 6.Rb1 (6.Bb5 c6 7.Ra2 Qa2 8.Na2 cb5 9.Nc3–+) 6...Qa3 7.Nb5 (7.e4 d4 8.Nb5 Qc5–+) 7...Qa5 8.Ra1 Qb6 9.Nf3 a6 10.Ne5 Be7 (10...Nf6 11.Be2–+) 11.Qf3 (11.Qg4 Bf6 12.Qg3–+) 11...f6 (better 11...Nf6–+) 12.Qh5 g6 13.Ng6 Bd7?? (13...hg6 Exploits the pin 14.Qh8 A pinning theme) 14.Nh8+– Kd8 15.Nf7 Kc8 16.Qh7 (16.Nc3 f5 17.Qh7 Nf6 18.Qh8 Ne8+–) 16...Bb5 17.Qg8 Kd7 18.Bb5 Qb5 19.d3 (19.Qg4 Nc6 20.Qg6 Qb2+–) 19...Qb4 (19...Qb2 20.0–0 Qc2 21.Rfc1 Qd3 22.Nh8+–) 20.Ke2 Bf8 (better 20...Qb2!? 21.Rhc1 Qc3+–) 21.Rhb1+– Qe7 (21...Qc5 22.c4 Nc6 23.Rb7 dc4 24.Rd1+–) 22.Rb7 Nc6 23.f4 (23.c4 d4+–) 23...a5 (23...Qc5 24.Rb2+–) 24.f5 (24.Qg6 Qc5 25.Rc1 Be7+–) 24...ef5 25.Rf1?? (25.Qg6 Qe6 26.Qh7+–) 25...Re8=+ 26.e4 (26.Qg3 Kc8 27.Rb2 Qf7 28.Qh3–/+) 26...Nd8?? (26...de4 27.d4 Nd4 28.Kf2 e3 29.Kg1 e2–+ (29...Nc2?! 30.Rd1 Kc8 31.Nd6 Qd6 32.Rd6=)) 27.Nd8+– Qd8 28.Qd5 Bd6 29.Rf5 (worse 29.Qf5 Re6 30.d4 Ke7+–) 29...Re6 (29...Re5 30.Re5 fe5 31.Ra7+–) 30.Qb5 Ke7 31.Qa5 (better 31.Rb8 c6 32.Rb7 Kf8 33.Qc6 Qe8 34.Qe8 Ke8 35.Ra5 Re7 36.Re7 Ke7+–) 31...Bh2 (31...Re5 32.Re5 Be5 33.Qc5 Bd6 34.Qf5+–) 32.Qc5 (better 32.Rh5 Qg8 33.Rh7 Qh7 34.Rc7 Bc7 35.Qc7 Ke8 36.Qh7+–) 32...Kf7 (32...Bd6 33.Qc6 Qg8 34.Rc7 Bc7 35.Qc7 Kf8 36.Qd8 Kg7 37.Qg8 Kg8+–) 33.Rh5 Bd6 (33...Qg8 34.Rh2 Qg4 35.Kd2 Qf4 36.Kc3 Qh2 37.Rc7 Qc7 38.Qc7 Re7 39.Qe7 Ke7+–) 34.Rh7 Kg6 (34...Kg8 35.Qh5 Re4 36.de4 Qe7 37.Qg6 Qg7 38.Qg7) 35.Qh5 (35.Qf5) 1–0. MARYMARY – Darrell, ChessWorld.net, 2013.

4.Ba3 Qa5 5.c3 e5 6.Bf8 Kf8 7.Qb3 Nf6 8.Nf3 Nc6 9.Na3 g6 10.Bb5 e4 11.Nd4 Nd4 12.ed4 c6 13.Be2 Kg7 14.0–0 Re8 15.Rab1 Re7 16.Rfd1 (16.Nc2 Bg4 17.Bg4 Ng4–/+) 16...Bg4 17.Re1 Be2 18.Re2 Qa6 19.Ree1 Qd3 (better 19...Qb6–+) 20.Re3= Qa6 (20...Qd2? 21.Rd1 Qd1 22.Qd1+–) 21.h3 (21.Ree1 Qb6 22.d3–/+) 21...b5 22.Nc2 Rae8 23.Nb4 Qc8 24.a4 Rb7 (24...a5 25.Na2–/+) 25.a5=+ Nh5 26.a6 (26.Ree1 Nf4–/+) 26...Rbe7 27.Ra1 (27.Ree1!?–/+) 27...f5–+ 28.Kf1? (better 28.Ree1–+) 28...f4 29.Re2 (29.Ree1–+) 29...f3 30.Re3 Nf4 31.g4 Nh3 32.Ke1 Qg4 33.Kd1 Qg1 34.Re1 Qf2 35.Kc2 e3 36.Rad1 e2 37.Rc1 (37.Nc6 ed1R 38.Rd1 Rc7 39.Qd5 Qe2–+) 37...Qe1! 38.Re1 Decoy theme: e1 38...f2 39.Rh1 (39.Qb1 Rf8 40.Nd3–+) 39...f1Q 40.Rf1 ef1Q 41.Nc6 Qf5 (41...Re1 42.Qb2 R8e2 43.Ne5 Rd2 44.Kb3 Rb2 45.Kb2 Rb1 46.Ka3 Qc1 47.Ka2 Qb2) 42.Kb2 Re1 (42...Re1 43.Qc2 R8e6–+) 0–1. petrobbo (2020) – the_tatar (2265), ChessWorld.net, 2013.

4.Ba3 Qb6 5.Nc3 c6 6.Nf3 Nf6 7.Be2 g6 8.Rb1 Qc7 9.0–0 Bg7 10.Na4 (10.d4 b6–/+) 10...0–0 (10...Qa5 11.c4 dc4 12.Bb4–+) 11.c4 (better 11.d4!?–/+) 11...dc4–+ 12.Bc4 (12.Bb2 b5 13.Nc5 Nbd7 14.Nd7 Qd7–+) 12...b5 13.Bb5 (13.Be2 ba4 14.Qa4 Be6–+) 13...cb5 14.Nc3 (14.Nc5 Qa5 15.Qb3 Bf5–+) 14...a6 15.d4 (15.Qe2–+) 15...Qc3 16.Be7 Re8 17.Rc1 Qa5 18.Ne5 (18.Qd2 Qb6–+) 18...Bb7 19.Bd6 (19.Bf6 Bf6 20.Ng4 Bg7–+) 19...Qd8 (19...Qa2 20.Rc7 Ra7 21.Nf7–+) 20.Bc5 (20.Bb8 Qb8 21.Qc2 Qd6–+) 20...Nbd7 (20...Qd5 21.Nf3–+) 21.Nd7 (21.Bd6 Ne5 22.de5 Re6–+) 21...Qd7 22.Qb3 (22.Qd2 Ne4 23.Qa5 Bh6–+) 22…Qd5 (22...Qd5 23.Qd5 Bd5–+) 0–1. Hilbert,Stephan J – Fabris,Alberto (1995), FICGS, 2014.

4.Qc1 Nc6 5.Nc3 Nf6 (5...Qa5 6.Nf3 Nf6 7.Bb5 Bd7 8.Ba3 Ne4 9.Qb2 Nc3) 6.Nb5 Kd8 7.Nf3 a6 8.Nbd4 Nd4 9.Bd4 c5.

4.Be5 Qa5+= A) 5.Nc3 Nf6 (5...Nd7 6.Nf3 Ngf6 7.Bd3 Ne5 8.Ne5 e6 9.0–0 Bb4) 6.Nf3 Nbd7 7.Rb1 a6 8.Bd3 b5 9.Bf6 Nf6; B) 5.Nf3 Nf6 (5...Nc6 6.Nc3 Nf6 7.Rb1 a6 8.Bd3 Ne4 9.Bd4 Nd4; 5...a6 6.Be2 Nc6 7.Nc3 Nf6 8.0–0 g6 9.Bf6 ef6; 5...Nd7 6.Bc3 Qb6 7.Bd3 Ngf6 8.0–0 Ne4 9.Re1 Qd6) 6.Bc3 Qb6 7.Bf6 gf6 8.Nc3 Qc5 9.Rb1 a6; C) 5.Bc3 Qb6 6.Na3 a6 7.Nf3 Nf6 8.Bd3 Qd6 9.Bb2 Nc6.

4.Be5 Nc6 5.Bc7 d4 6.ed4 Nd4 7.c3 Qc5 8.cd4 Qc7 9.Nc3 Bd7.

4.Be5 Nd7 5.Bc7 e5 6.f4 f6 (6...d4 7.ed4 Qd4 8.c3 Qf4 9.Nf3–/+) 7.fe5= fe5 (worse 7...Ne5 8.Nc3 d4 9.Bb5 Kf7 10.ed4 Qd4 11.Qh5 g6 12.Be5 Qe5 13.Qe5 fe5 14.Bc4 Kg7 15.Nf3+=) 8.Nf3 e4 (8...Bd6!? 9.a3 Qc5 10.Bd6 Qd6=) 9.Nd4+= Ngf6 (9...Ndf6 10.Bb5 Bd7 11.Nc3 Bb5 12.Ncb5+=) 10.Nc3 Qc5 11.Bf4 (11.Ne6 Qe7 12.Nb5 Qe6+–) 11...a6? (better 11...Nb6+=) 12.Ne6+– (12.Ne6 Qa7 13.Nc7 Kd8 14.N3d5 (14.Na8?! Qa8 15.Rb1 b5+–) 14...Nd5 15.Nd5+–) 1–0. onur604 (2320) – Kofun (2175), lichess.org, 2020.

4.Qc1 Nf6–/+

5.a3 Qa5 6.Bc3 Qb6 7.Bf6 Qf6 8.Nc3 e6 9.Nf3 Bc5.

5.a3 Qb6 6.Nf3 Nc6 7.c4 Be6 8.cd5 Bd5 9.Nc3 Bf3.

5.a3 Qc5 6.Nf3 Nc6 7.Nc3 Bd7 8.Nb5 Rc8 9.Be2 h5.

5.Nc3 a6 6.Nf3 Nc6 7.Bd3 e5 8.e4 Be6 9.a3 Qa5.

5.Nc3 Nc6 6.Nb5 Kd8 7.Nf3 Ne4 8.Bd3 Nc5 9.Be2 Ne4.

5.Nf3 Nc6 6.Nc3 a6 7.Be2 e5 8.0–0 Bd6 9.a4 e4.

5.Nf3 h5 6.Nc3 Qa5 7.Nb5 Ne4 8.c4 Bd7 9.Nc3 c6.

5.Nf3 Qa5

6.Bc3 Qb6 7.Na3 Ne4 8.Rb1 Qg6 9.Nb5 Na6.

6.c4 Nc6 7.cd5 (7.Bc3 Qc5 8.d4 Qd6 9.c5 Qe6 10.Nbd2 Qg4+=; 7.Qc3 Qa4 8.Qb3 Qb3 9.ab3 Nb4 10.Na3 Bg4+=; 7.Be2 Bf5 8.Bc3 Qc5 9.d4 Qd6 10.c5 Qe6+=) 7...Qd5 8.Nc3 Qd6 9.Nb5 Qd8 10.Be5 Kd7 +/–.

6.c4 Nbd7 7.Be2 (7.cd5 Nd5 8.e4 Nf4 9.g3 Ng6 10.Qc3 Qb6–/+; 7.Bc3 Qb6 8.cd5 Nd5 9.Bc4 Qc6 10.Bd5 Qd5–/+; 7.Qc3 Qb6 8.cd5 Nd5 9.Qc2 Nb4 10.Qc3 Nc5–/+) 7...e6 8.Bc3 Qb6 9.0–0 Bd6 10.d4 Qa6 +=.

6.c4 Bg4 7.Ne5 (7.Bc3 Qb6 8.Ne5 Bf5 9.cd5 Nd5 10.Bd4 Qd6+=; 7.Nd4 c6 8.cd5 Nd5 9.h3 Bh5 10.e4 Nf6–/+; 7.Be2 Nc6 8.Bc3 Qc5 9.d4 Qd6 10.c5 Qd7+=) 7...Bf5 8.cd5 Nd5 9.Qc4 f6 10.e4 fe5 =.

6.c4 dc4

7.Qc3 Nc6 8.Bc4 Qh5 9.d3 Bh3 10.gh3 Qf3 –/+.

7.Qc4 Nbd7 8.Bc3 Qb6 9.d4 e6 10.Nbd2 Be7 +=.

7.Bc4 c6 8.0–0 Nbd7 9.d4 (9.Bc3 Qh5 10.d4 Nb6+=) 9...e6 (9...Nb6 10.Bb3 (10.Bc3 Qh5 11.Be2+=) 10...Bf5+=) 10.Nbd2 (10.Rd1 Bd6+=) 10...Be7 11.Bd3 0–0 12.Nc4 Qd8 13.a4 a5 14.Qc2 h6 15.Rac1 Nd5 16.Nfe5 (16.Bc3 b6+=) 16...Nb4 17.Qb1 b5 18.Nd7 Bd7 (worse is 18...Qd7 19.Nb6 Qb7 20.Bh7 Kh8 21.Na8 Qa8 22.Be4+/–) 19.Ne5 ba4 (19...Nd3 20.Qd3 Rc8 21.Rc2+=) 20.Be4 Increasing the pressure on the isolated pawn on c6 20...Rb8 21.Qa1 Bd6 22.Rfd1 Nd5 23.Ba3 (worse is 23.Nc6 Bc6 24.Rc6 Bh2 25.Kf1 Bd6–/+) 23...Nb4 24.Bc6 Bc6 (24...Nc6? 25.Bd6 (25.Nc6?! Bc6 26.Rc6 Bb4=) 25...Ne5 26.de5+– (26.Be5?! Rb7=)) 25.Nc6 Nc6 26.Rc6 Ba3 27.Qa3 Rb4 28.Rc5 Qb6 29.h3 Rb8 30.Rdc1 Qa6 31.Rc6 Qe2 32.R6c2 Qa6 ½–½. Curado,Manuel Joao Ferro – Oliveira,A (2230), Summer Festival Open, Lisbon POR, 2000.

7.Bc4 c6 8.0–0 e6 9.Na3 Nbd7.

7.Bc4 c6 8.0–0 Qh5 9.d4 Bf5 10.Nc3 e6 +=.

7.Bc4 Nc6 8.Na3 Ne4 9.0–0 a6.

7.Bc4 Nc6 8.Qc2 Rb8 9.Bc3 Qf5 10.Qb3 e6 +=.

7.Ne5 Nbd7 8.Nc4 Qf5 9.d4 a6 10.Be2 Rb8 +=.

3.Nf3 Qb4

4.Ba3 Qa5 5.c4 (5.e3 Bg4–/+) 5...dc4 6.e3 b5 7.Ne5 Bb7 8.Nf7 (better is 8.Bb2!? Nc6 9.Nc6 Bc6 10.a4–/+) 8...Kf7–+ 9.Qh5 g6 10.Bc4 e6?? (10...bc4 11.Qa5) 11.Qe5=+ Qb6 (11...Ba3?? 12.Be6 Kf8 13.Qh8+–) 12.Bf8 Nf6 (12...bc4 13.Qg7 (13.Qh8?! Kf8 14.Nc3 h6=) 13...Ke8 14.Ba3+/– (14.Qh8?! Kf8 15.Nc3 h6=); 12...Bg2? 13.Qg7 Ke8 14.Rg1 bc4 15.Rg2+– (15.Qh8?! Kf8 16.Rg2 Nd7+–)) 13.Bc5 Qc6 (13...Nbd7 14.Qf6 Kf6 15.Bb6 bc4 16.Bc7 Bg2 17.Rg1=+) 14.Bd4= Nbd7 15.Qb5 Qg2 16.Rf1 Bc6 17.Qa6 Rhe8 18.Nc3 White gets the initiative 18...Nb6 19.Ne2 Nfd5 (19...Qh2!? 20.Rc1 A) 20...Nc4? 21.Qc6 (21.Qc4?! Bd5 22.Qa4 Bf3=; 21.Rc4?! Bd5=) 21...Nb6 22.Qf3+– (22.Qc7?! Qc7 23.Rc7 Re7 24.Re7 Ke7+=); B) 20...Bg2=) 20.Rc1+= Nb4 (20...Bd7!?+=) 21.Qa5+/– Nc4 22.Qb4 (22.Qc7?? Re7 23.Qe7 Ke7 24.Bc5 Kd7–+) 22...Bb5?? (22...Nb6 23.f3! Nd5 24.Qa5+–) 23.Rc4 Bc4 24.Qc4 Qd5 25.Qc7 Re7 26.Qf4 Qf5 27.Qf5 gf5 28.Rg1 e5 29.Bc5 Rb8 30.d4 Rd7 31.f4 ef4 32.Nf4 Rb1 33.Kf2 Rb2 34.Kf3 Rh2 35.Rg2 Rh1 36.Nd3 Kf6 37.Ne5 Rb7 38.a3 Rf1 39.Rf2 Rc1 40.Nc6 Rg7 41.Rh2 Rcg1 42.Rh6 Kf7 43.Na7 R7g4 44.Rh7 Ke6 45.Nb5 Rg8 46.Ke2 R1g2 47.Kd3 f4 48.Re7 Kf6 49.Nc3 R2g3 50.Nd5 (50...Kf5 51.Re5 Kg6 52.Nf4 Kh7 53.d5+–) 1–0. Rogers,Johnathan – Scott,Kenneth, Capitol City Spring, 1986.

4.Ba3 Qb5 5.e4 de4 6.Bb5 c6 7.Bc6 1–0. guest1 – guest534, ICC, 1999.

4.Qc1 f6 5.e3 e5 6.Be2 (6.Ba3 Qg4=+) 6...Be6 (6...Qg4 7.0–0–/+) 7.0–0 Bd6 8.d4 e4 9.Bc3 (9.Nfd2!?=+) 9...Qb6–/+ 10.a4? (better 10.Nfd2–/+) 10...ef3–+ 11.Bf3 c6 12.Nd2 f5 13.a5 (13.Bh5 g6 14.Be2 Nf6–+) 13...Qc7 14.Bh5 (14.h3 Nf6–+) 14...g6 15.Bf3 Bh2 16.Kh1 Nf6 (16...Bd6 17.Qb2–+) 17.Be2 (17.g3 Bg3! 18.fg3 Qg3–+) 17...Nbd7 (17...Bd6 18.Qb2–+) 18.Bb4 (18.g3 Bg3! 19.fg3 Qg3–+) 18...Bd6 19.Bc3 (19.Bd6 Qd6 20.c4 f4–+) 19...0–0 20.Nf3 Qd8 (better 20...Ne4 21.Bb2 f4–+) 21.Ng5 (21.Qb2 Ne4–+) 21...Qe7 (better 21...Ne4 22.Bb4 Qg5 23.Bd6 Nd6 24.Rb1–+) 22.Bd2 Rae8 (22...Ne4 23.Nh3–+) 23.c4 Qg7 24.cd5 (24.Kg1 Qh6 25.Nf3 Ng4–+) 24...Qh6 25.Kg1 (25.Nh3 Nd5 26.Kg1–+) 25…Qh2 0–1. alessandrocarvalhaes (1890) – maeneser (1860), lichess.org, 2020.

4.Qc1 Nf6 5.e3 c6 6.a4 (6.a3 Qd6–/+) 6...Qa5 7.c4 e6 (7...Bg4 8.Ne5–/+) 8.Be2 (8.Bf6 gf6 9.cd5 Qd5+=) 8...Nbd7–/+ 9.0–0 Bd6 (9...dc4 10.Na3–/+) 10.Nd4 (10.d4 0–0+=) 10...0–0–/+ 11.f4 Re8 12.Nc3 (12.cd5 ed5 13.Nf5 Bb4–/+) 12...Nc5 (12...dc4 13.Bc4 e5 14.fe5 Ne5 15.Be2–/+) 13.Qe1 (13.Qc2 dc4 14.Bc4 Nd5–/+) 13...Nce4 (13...dc4!? 14.Bc4 Qb4–/+) 14.d3 Nc3 15.Bc3 Qd8 16.Nf3 Bc5 (16...dc4 17.dc4 Bc5 18.Bd4 Bd4 19.ed4–/+) 17.d4+= Bf8 18.Bb4 dc4 (18...c5 19.dc5 Qc7 20.cd5 ed5 21.Ne5–/+) 19.Bf8 Rf8 20.Bc4 Bd7 21.Rb1 (21.Ne5 Rc8=) 21...Rb8 (21...Qc7 22.Qb4 b6 23.a5+=) 22.Bd3 (22.a5 Qc7+=) 22...g6 (22...c5 23.dc5 Ba4 24.Qc3+=) 23.Ne5= Kg7 (23...Nd5 24.e4 Ne7 25.Qb4=) 24.Rb2 (24.a5 Qc7=) 24...Ng8 25.Qb1 (25.Qg3 Ne7=) 25...b6 (25...f6 26.Nf3 b6 27.Bc4=) 26.Rc1 (26.a5 Nf6=) 26...Ne7 27.Rf1 (27.Be4!?=) 27...f6+= 28.Nf3 c5 29.Bb5 Bb5 30.ab5 Nf5 31.dc5 (31.Re1 Rc8+=) 31...bc5–/+ 32.Rd1 Qe7 (32...Qb6 33.Qe4–/+) 33.e4+= Nd4 The isolani on b5 becomes a target 34.Nd4 cd4 35.Kh1 (35.Qd3 e5+=) 35...e5–/+ 36.Qa2 (36.Qc2 Rfc8 37.Qa4 Rc5–/+) 36...Rfc8 37.h3 (37.Qb1 Qb7–/+) 37...Rc5 38.fe5 fe5 39.Rf1 (better is 39.Qa3!?–/+) 39...Rcb5–+ 40.Rbf2 R8b7 41.Rf7? (better is 41.Rf3–+) 41...Qf7 42.Rf7 Rf7 43.Qc4 Rfb7 44.h4 (44.Kh2 a5–+) 44...h5 (better is 44...a5–+) 45.g4 (45.Kh2–+) 45...Rb1 46.Kg2 R1b2 (46...hg4 47.Kg3 R7b3 48.Qb3 Rb3 49.Kg4 a5 50.h5 gh5 51.Kf5 d3 52.Ke6 d2 53.Kd6 d1Q 54.Ke6 Rb6 55.Ke5 Qd6 56.Kf5 Qf6) 47.Kg1 (47.Kf1 hg4 48.Qe6 Rb1 49.Ke2 R7b2 50.Kd3 Rd1 51.Kc4 Rc1 52.Kd5 Rb5 53.Kd6 Rb6 54.Ke5 Re6 55.Ke6 d3–+) 47...Rd2 (better is 47...hg4 48.Qf1 Rb1 49.Qb1 Rb1 50.Kf2 Rb2 51.Kg3 d3 52.Kg4 d2 53.h5 d1Q 54.Kh4 gh5 55.Kg3 Qg4) 48.Qc1 Re2 49.gh5 d3 (49...Re4?! 50.Qg5 Re1 51.Kf2–+) 50.Qa1 (50.Qf1 Rbb2 51.h6 Kh6 52.Qf8 Kh5 53.Qf3 Kh4 54.Qf6 g5 55.Qh6 Kg4 56.Qe6 Kf4 57.Qf5 Ke3 58.Qg5 Ke4 59.Qg6 Kd4 60.Qd6 Kc3 61.Qc5 Kd2 62.Qa5 Kc1 63.Qa1 Rb1 64.Qc3 Rc2 65.Qa3 Kd2 66.Kf2 Re1–+) 50...Kh6 51.Qf1 (51.hg6 d2 52.Kf1 Re4–+) 51...Rb1! (51...Rb1 52.Qb1 d2–+) 0–1. Larsen,Andreas (1790) – Forsaa,Espen (2255), NOR–chT lag Tromsoe, 2007.

4.c3 Qb2 0–1 (withdraw). Grabb – Benassi, corr 3GMM–18 1994.

4.Bc3 Qa4 A) 5.e3 A1) 5...Nc6 6.Be5 Nf6 7.Nc3 Qa5 8.Bb5 e6 9.0–0 Bd7 10.Bc6 Bc6 11.Nd4; A2) 5...Nd7 6.Bd4 (6.Be2 Ngf6 7.Bd4 Qa5 8.Nc3 a6 9.0–0 c5 10.Bf6 Nf6 11.Qb1; 6.Be5 Qa5 7.Nc3 Ngf6 8.Bd3 Ne5 9.Ne5 e6 10.0–0 Bb4 11.Qf3; 6.Bb2 Qb4 7.Bd4 Ngf6 8.Nc3 a6 9.Qe2 c5 10.Rb1 Qa5 11.Bf6) 6...Ngf6 7.Nc3 Qa5 8.Be2 Ne4 9.Rb1 c5 10.Rb5 Qc7 11.Nd5; A3) 5...Bf5 6.Nd4 (6.Bb2 Nf6 7.Nc3 Qa5 8.Nd4 Bd7 9.Qf3 e6 10.Ncb5 Na6 11.a4; 6.Be5 Qc2 7.Qc2 Bc2 8.Na3 Bf5 9.Nb5 Na6 10.Bc7 Nf6 11.Be5) 6...Bd7 7.Bb2 Nf6 8.Nc3 Qa5 9.Qf3 e6 10.Ncb5 Nc6 11.Nc6; A4) 5...Nf6 6.Bd4 (6.Be5 Qa5 7.Nc3 Nbd7 8.Bd3 Ne5 9.Ne5 Nd7 10.Nd7 Bd7 11.Rb1; 6.Bf6 gf6 7.Nc3 Qd7 8.Bd3 Nc6 9.0–0 Bg7 10.Rb1 f5 11.Bb5) 6...Qa5 7.Nc3 Nc6 8.Bb5 Bd7 9.Bc6 Bc6 10.0–0 e6 11.Ne5; B) 5.Be5 B1) 5...Qd7 6.Nc3 (6.e3 Nf6 7.Nc3 Nc6 8.Bb5 a6 9.Bc6 Qc6 10.0–0 h5 11.Qe2; 6.Bg3 Nc6 7.e3 Nf6 8.Nc3 Ne4 9.Rb1 Ng3 10.hg3 g6 11.Bb5) 6...Nf6 7.e3 Nc6 8.Bb5 a6 9.Bc6 Qc6 10.Rb1 Ng4 11.Bg3; B2) 5...Qa5 6.Nc3 (6.e3 Nd7 7.Nc3 Ngf6 8.Bd3 Ne5 9.Ne5 Nd7 10.Nd7 Bd7 11.Rb1; 6.Bc3 Qb6 7.e3 Nc6 8.d4 Nf6 9.Nbd2 a5 10.a3 e6 11.Bd3) 6...Nf6 7.e3 Nbd7 8.Bd3 Ne5 9.Ne5 g6 10.Bb5 Bd7 11.Nd7; B3) 5...Nc6 6.Bc7 (6.Nc3 Qa5 7.Rb1 Ne5 8.Ne5 c6 9.e3 Nh6 10.Be2 g6 11.0–0; 6.e3 Nf6 7.Nc3 Qa5 8.Bb5 e6 9.Bc6 bc6 10.Nd4 Bd7 11.Nb3) 6...Nb4 7.Nd4 Nc6 8.Nf3 Nb4 9.Nd4 Nc6 10.Nf3 Nb4 11.Nd4; B4) 5...Nf6 6.Nc3 (6.e3 Qa5 7.Nc3 Nbd7 8.Bd3 Ne5 9.Ne5 Nd7 10.Nd7 Bd7 11.Rb1; 6.Bc7 Ne4 7.Nc3 Nc3 8.dc3 Qc4 9.Be5 Nc6 10.e3 Qc5 11.Bd4) 6...Qa5 7.Rb1 c6 8.e3 Nbd7 9.Bd3 b5 10.0–0 b4 11.Ne2.

4.Bc3 Qb6 A) 5.e3 A1) 5...Nf6 6.Bd4 (6.Bf6 Qf6 7.Nc3 e6 8.Bd3 Nc6 9.Nb5 Bd6 10.0–0 e5 11.e4) 6...c5 7.Bf6 gf6 8.Nc3 Qd8 9.Bb5 Nc6 10.Nh4 d4 11.Na4; A2) 5...Nd7 6.Bd3 (6.Na3 a6 7.Rb1 Qd6 8.Rb3 Ngf6 9.Bd3 c5 10.Bf5 b5 11.Ba5) 6...Nc5 7.Na3 Nd3 8.cd3 c6 9.0–0 Nf6 10.Nc2 c5 11.Ne5; A3) 5...Nc6 6.Na3 (6.Bd3 Nf6 7.Bf6 ef6 8.Nc3 Qa5 9.Bb5 Bd6 10.Rb1 0–0 11.Nd5; 6.d4 Nf6 7.Nbd2 a5 8.a3 g6 9.Rb1 Qa7 10.Bb5 Bd7 11.Ne5; 6.a4 Nf6 7.a5 Qc5 8.d4 Qd6 9.Nbd2 g6 10.a6 Bg7 11.ab7) 6...a6 7.Bd3 Nf6 8.0–0 Qc5 9.Bb2 b5 10.Nb1 Qd6 11.Nd4; B) 5.Na3 Qc5 6.Qc1 (6.Bb2 Nf6 7.e3 a6 8.Be2 Nc6 9.0–0 b5 10.c3 Ne4 11.d4) 6...Nc6 7.Qb2 Nf6 8.Nb5 Qb6 9.Qb3 a6 10.Nbd4 Qb3 11.ab3; C) 5.Qc1 C1) 5...Nf6 6.Bf6 (6.Bd4 Qd6 7.Be5 Qd8 8.Nc3 Nc6 9.Bg3 Nh5 10.e3 Ng3 11.hg3) 6...gf6 7.Nc3 c6 8.Rb1 Qa5 9.e3 e5 10.Be2 Na6 11.0–0; C2) 5...Nd7 6.Na3 e6 7.Rb1 Ba3 8.Qd1 Ngf6 9.Rb6 ab6 10.e3 Be7 11.Qa1; C3) 5...Nc6 6.Na3 (6.e3 Nf6 7.Bf6 gf6 8.Nc3 Qc5 9.Rb1 a6 10.Qb2 Rg8 11.g3; 6.d4 Bf5 7.Nbd2 a5 8.Nh4 Nh6 9.e3 e6 10.Nf5 Nf5 11.Rb1) 6...a6 7.e3 Nf6 8.Bd3 Qc5 9.Ne5 e6 10.Nc6 bc6 11.Nb1; D) 5.a4 D1) 5...Nd7 6.Na3 (6.a5 Qd6 7.Na3 a6 8.e3 Ngf6 9.Be2 Ne4 10.0–0 Nc3 11.dc3) 6...a6 7.e3 Ngf6 8.Bd3 Ne4 9.Nc4 Qg6 10.Be4 de4 11.Nh4; D2) 5...Nc6 6.Na3 (6.d4 a5 7.e3 Nb4 8.Ne5 Nh6 9.Be2 Nf5 10.0–0 g6 11.Na3; 6.a5 Qc5 7.d4 Qd6 8.e3 Nf6 9.Na3 a6 10.Bd3 Ne4 11.Bd2; 6.e3 Nf6 7.a5 Qc5 8.d4 Qd6 9.Nbd2 g6 10.a6 Bg7 11.ab7) 6...a6 7.e3 Nf6 8.Bd3 g6 9.0–0 Bg7 10.Qb1 Qc5 11.Nd4.

4.Bc3 Qc5 5.Bd4 Qa5 (5...Qd6 6.Be5 Qd7 7.Nc3 Nf6 8.e3 Nc6 9.Bb5 a6 10.Bc6 Qc6 11.Rb1) 6.Nc3 (6.e3 Nc6 7.Nc3 Nd4 8.Nd4 c6 9.Bd3 e5 10.Nb3 Qc7 11.0–0; 6.Bc3 Qb6 7.e3 Nc6 8.d4 a5 9.a3 Nf6 10.Nbd2 g6 11.Rb1) 6...Nc6 7.e3 a6 8.Bd3 Nf6 9.h3 e6 10.0–0 Bd6 11.Bf6.

4.Bc3 Qd6

5.d4 Nc6 6.Bd2 –/+.

5.d4 e6 6.e3 Nf6 7.Nbd2 Be7 (7...c5 8.Rb1–/+) 8.Ne5 (8.Bd3 b6+=) 8...0–0 9.Be2 (9.Rb1 c5–/+) 9...Nc6 10.0–0 Qa3 11.Nb3 Ne5 12.de5 Nd7 (12...Ne4 13.Be1–/+) 13.Qd3 (13.Qd2 Nb6–/+) 13...Bb4 (13...c5 14.Qd2–/+) 14.Bb4+= Qb4 15.g3? (better is 15.f4!?+=) 15...Ne5–+ 16.Qd1 (16.Qd4 Qd6–+) 16...b6 17.f4 (17.Qd4 Qd6–+) 17...Nc4 18.Bc4 Qc4 19.Nd2 (19.Qd4 Qa6–+) 19...Qc3 20.Re1 Bb7 21.e4? (21.Nf3–+) 21...Qc5 22.Kg2 (22.Kf1 de4 23.Nb3 Qc6–+) 22...de4 23.Ne4 (23.Nf1–+) 23...f5 0–1. Haroldlee123 – Szkodnikow_i_ofiar, ChessWorld.net, 2015.

5.e3 Nc6 6.Bb5 (6.Bb2 Nf6 7.Nc3 a6 8.a4 Bf5 9.Ba3 Qd7 10.d4 0–0–0 11.Be2; 6.Bd3 Nf6 7.Bf6 gf6 8.Nc3 a6 9.0–0 Rg8 10.g3 Bg4 11.Rb1; 6.a4 Nf6 7.Bb2 Bf5 8.Nc3 a6 9.Be2 d4 10.Nd4 Nd4 11.ed4; 6.Be2 Nf6 7.Bb2 Qb4 8.Qc1 Bf5 9.0–0 0–0–0 10.Ng5 Bg6 11.Nf3) 6...a6 7.Be5 Qd7 8.Bc6 bc6 9.Nc3 f6 10.Bg3 Rb8 11.0–0.

5.e3 Nd7 6.Be2 (6.Bb2 Qb6 7.Ba3 Ngf6 8.Nc3 Qa5 9.Bb2 e5 10.Be2 c6 11.0–0; 6.Bd3 Ngf6 7.0–0 e5 8.Be2 Be7 9.d4 e4 10.Ne5 0–0 11.Nd2; 6.d4 Ngf6 7.Nbd2 g6 8.Bd3 Bg7 9.0–0 0–0 10.Rb1 a5 11.Qc1; 6.d3 b5 7.a3 Ngf6 8.Nbd2 g6 9.g4 h6 10.Be2 Bg7 11.0–0) 6...Ngf6 7.0–0 g6 8.Qc1 Bg7 9.Bb2 a6 10.c4 0–0 11.d4.

5.e3 Bg4 6.Be2 (6.h3 Bf3 7.Qf3 Nc6 8.Be2 Nf6 9.0–0 e5 10.a4 Qe6 11.Na3; 6.a4 Nc6 7.Na3 a6 8.h3 Bh5 9.Bd3 e5 10.g4 Bg6 11.Nh4; 6.Bb2 Nc6 7.Nc3 Nf6 8.h3 Bh5 9.Be2 0–0–0 10.0–0 a6 11.a4) 6...Nd7 (6...Nc6 7.Bb2 Nf6 8.Nc3 a6 9.0–0 b5 10.h3 Bf5 11.a3) 7.h3 Bf3 (7...Bh5 8.0–0 Ngf6 9.d3 0–0–0 10.Nbd2 e5 11.Rb1) 8.gf3 (8.Bf3 e5+= (8...Ngf6 9.Bb2 Qb6 10.Bd4 Qc6 11.0–0) 9.0–0 Ngf6 10.d3 Be7 11.Nd2) 8...Ngf6 9.d3 (9.d4 e5–/+ (9...g6 10.Qc1 c5 11.Qa3) 10.Qd3 ed4 11.Bd4; 9.Bb2 0–0–0 10.Nc3 c6 11.Rb1) 9...g6 (9...e5 10.d4 0–0–0 11.de5) 10.Nd2 (10.f4 e6 11.Nd2) 10...c5 (10...e5 11.Qb1) 11.a4 (11.Rb1 b6–/+; 11.f4–/+) 11...Bg7 12.h4 d4 13.Nc4 Qc7 14.Bb2 Nd5 15.h5 Bf6 16.hg6 (16.Qc1 g5–/+) 16...hg6–+ 17.Rh8 Bh8 18.e4 Nf4 19.Kd2 (19.Bf1 Ne5–+) 19...Nb6 20.Nb6 (20.Kc1 Nc4 21.dc4 Bf6–+) 20...Qb6 (20...ab6 Worse is 21.Qh1 Bg7 22.Kd1–+) 21.Kc1 Be5 22.a5 Qc6 23.Qe1 0–0–0 24.Kb1 Rh8 25.Bd1 Rh2 26.Ra3 Kb8 27.Bc1 Nh3 28.Rb3 Qc7 29.a6 b6 30.f4 Nf4 31.Bf4 Bf4 32.Bf3 Be5 33.Bg4 Qc6 34.Qf1 g5 35.Bf3 Qf6 36.Bg2 Bg3! 37.f3 Qf4 38.e5 Qd2 39.e6 0–1. Moret,Jean Paul – Ammann,Philipp, Zuerich op–A, 1981.

5.Be5 Qd7 6.Nc3 (6.e3 Nf6 7.Nc3 Nc6 8.Bd3 e6 9.0–0 Be7 10.Bd4 0–0 11.Ne5; 6.Bg3 Nc6 7.e3 Nf6 8.Nc3 Ne4 9.Bb5 Ng3 10.hg3 g6 11.Ng5; 6.Na3 Nc6 7.e3 a6 8.c4 Nf6 9.Bb2 e6 10.cd5 ed5 11.Bd3) 6...Nf6 7.e3 Nc6 8.Bb5 a6 9.Bc6 Qc6 10.0–0 Bg4 11.h3.

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  • 1.b4 e5 2.Bb2 Bb4 3.f4 ef4 4.Bg7 Qh4 5.g3 fg3 6.Bg2 gh2 7.Kf1 hg1Q 8.Kg1 (Kucharkowski-Meybohm gambit, 6 players, 10 days move)
  • 1.b4 e5 2.Bb2 f6 3.e4 Bb4 4.Bc4 (Sokolski gambit, 4 players, 3 days/move)
  • 1.c4 Nf6 2.b4 (English orangutan, 4 players, 3 days/move)
  • 1.e4 c5 2.b4 (Sicilian: Wing gambit, 4 players, 10 days/move)
  • 1.e4 e6 2.Nf3 d5 3.e5 c5 4.b4 (French: Wing gambit, 4 players, 3 days/move)

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