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TESTA400 Release 2021-06-06
Send your 1.b4 games to me, please. Thank you! /Marek
Marek Trokenheim's homepage
(c) Marek Trokenheim

1.b4 a5 2.b5 e5

(...)

3.a4 Bb4 4.Ba3 Qe7 5.c3 Ba3 6.Na3 Nf6 7.f3 (7.b6 d5=+) 7...0–0–/+ 8.Nh3 d6 9.e4? (9.g3 d5–/+) 9...b6?? (9...Bh3 10.gh3 Ne4 11.Ke2–+) 10.Nc4? (better 10.Nf2=+) 10...Bh3–+ 11.gh3 Nbd7 (11...Ne4!? 12.Ne3 Qh4 13.Ke2–+) 12.Bg2 (12.Ne3 d5–/+) 12...Qe6 (12...Nh5 13.Ne3–/+) 13.Ne3 Rac8 14.Ra3 (14.d4 Qe8–/+) 14...c5 (14...d5 15.0–0–/+) 15.c4 (15.bc6 Rc6 16.d4 d5–/+) 15...Nh5 16.Nd5 f5 17.Qe2 (17.Qc2 Nf4 18.ef5 Qf7 (worse 18...Rf5 19.Qf5 Ng2 20.Kf1 Qf5 21.Ne7 Kf8 22.Nf5+–) 19.Nf4 ef4–/+) 17...f4 (17...Nf4 18.Nf4 ef4 19.0–0–/+) 18.Qf2 Ndf6 (better 18...Nhf6!?–/+) 19.Nb6= Rb8 20.Nd5 Nd5 21.cd5 Qd7 22.Rc3 Rbc8 23.d3 Rc7 (23...Nf6 24.0–0=) 24.0–0 Rf6 (24...Nf6 25.Rb3=) 25.Rc4 h6 26.Qh4 Qf7 (26...Qe8 27.Rb1+=) 27.Rb1+– g5 (27...Rb7 28.Rb2+–) 28.Qf2 (28.Qe1 Ra7+–) 28...Rg6 (28...Rb7 29.h4+–) 29.Kf1 (29.Qe1!? Ra7 30.b6 Rb7+–) 29...Ng7 (29...Rb7 30.h4+–) 30.Ke2 (30.b6 Rc8+–) 30...Qf6 (30...Rb7 31.h4+=) 31.Rg1 (31.Qe1 Ra7+–) 31...h5 (31...Rb7 32.Kd1+=) 32.Kd2 (32.Qe1 Ra7+–) 32...Ne8 33.Rcc1 (33.Kd1+–) 33...g4? (better 33...h4+=) 34.hg4 hg4 35.fg4 Rg4 36.Bf3 Rg5?? (better 36...Rg1 37.Rg1 Kf8+–) 37.Rg5 Qg5 38.Rg1 Rg7 (38...Qg1 39.Qg1 Rg7 40.Qb1+–) 39.Rg5 Rg5 40.Qh4 Rg7 41.Qd8 Kf8 42.h4 (42.Bh5 Re7+–) 42...Rh7 43.h5 Kf7 44.Qd7 Kg8 (44...Kf6 45.Qh7 Ng7 46.Qg6 Ke7 47.Qg7 Ke8 48.b6 c4 49.b7 c3 50.Kc3 Kd8 51.b8Q) 45.Qe8+– Kg7 46.Qg6 Kh8 47.h6 (47.Bg4 Re7 48.Qf6 Kh7 49.Qe7 Kh6 50.Qf6 Kh7 51.h6 c4 52.Qg7) 47...Rd7 (47...Rb7 48.Bg4 Re7 49.Be6 Rf7 50.Qf7 c4 51.Qg7) 48.Qe8 (48.Bg4 Re7 49.Be6 Rf7 50.Qf7 c4 51.Qg7) 48...Kh7 49.Qd7 Kh6 50.Qd6 (50.Qf7 c4 51.Bh5 c3 52.Kc3 Kg5 53.Qg6 Kh4 54.Qg4) 50...Kg5 (50...Kh7 51.Bh5 c4 52.Qc7 Kh6 53.Qf7 c3 54.Kc3 Kg5 55.Qg6 Kh4 56.Qg4) 51.Qe5 (51.b6 c4 52.dc4 Kh4 53.Qg6 Kh3 54.Qg4 Kh2 55.Qg2) 51...Kh4 (51...Kg6 52.Bh5 Kh6 53.Qe8 Kg7 54.Qf7 Kh8 55.Bg6 c4 56.Qf8) 52.Qf4 Kh3 53.Qg4 Kh2 54.Qg2 1–0. lindsey000 – mylaguna, gameknot.com, 2017.

3.a4 c5 4.Bb2 e4 5.e3 d5 6.c4 (6.d3 ed3 7.Bd3 Be6=) 6...Nf6 (6...d4 7.Qh5 d3 8.Nc3+=) 7.f3 (7.cd5 Nd5 8.d3 Qh4=) 7...b6 (7...Be6 8.Bf6 Qf6 9.Nc3 dc4 10.Ne4+=) 8.cd5 Bf5 (8...Nd5 9.Nc3=) 9.Nc3 ef3 10.Nf3 Bd6 11.Be2 Nbd7 12.0–0 0–0 13.Ng5 (13.Nh4 Bg6+–) 13...Bg6+= 14.Nf3 (14.Nh3 Qc7 15.Nf4 Rad8+=) 14...h6 (better 14...Bf5!?=) 15.d3+– Qc7 16.e4 (better 16.Qd2!?+–) 16...Ng4= Increases the pressure on h2 17.h3 (17.Qb3 Bh2 18.Kh1 Ndf6=+) 17...Ne3=+ 18.Qe1 (18.Qd2!? Nf1 19.Rf1=+) 18...Nf1–/+ 19.Qf1 Ne5 (19...Rae8 20.Nh4–/+) 20.Ne5 (20.Nh4 f5 21.Nf5 Rae8=+) 20...Be5–/+ 21.Bf3 (21.Bg4 Bd4 22.Kh1 Rae8–/+) 21...Bd4 22.Kh1 Qg3?? (22...Rae8 23.Qc1–/+) 23.Qe1?? (better 23.Ne2 Qd6 24.Nd4 cd4 25.Bd4+–) 23...Bf2 (23...Qg5 24.h4 Qe5 25.Rc1–/+) 24.Qe2 (24.Qd2 Qh4=) 24...Rae8=+ 25.Rf1 (25.Qd2!? Qh4 26.Ne2=) 25...Bd4–/+ 26.Qe1 Qd6 27.Bg4 (27.g4 f5–/+) 27...Re5 (27...f5 28.Bf3–+) 28.Qe2 Rg5 (28...f5!? 29.Bf3 Re7–+) 29.Nd1 h5 (29...f5!? 30.Bf5 Bf5–/+ (worse 30...Rff5 31.ef5 Rf5 32.Rf5 Bf5 33.Bd4 cd4 34.Qf3+=)) 30.Bd4 cd4 31.Bf5? (31.Bf3 Qb4 32.Nb2 Re8+=) 31...Rg3?? (better 31...Bf5 32.Rf5 Rf5 33.ef5 Qd5 34.Qh5 Re8–+) 32.Bg6 Qg6 33.Rf3 (33.Qc2 f5 34.ef5 Qd6=+) 33...Rg5 (better 33...Rf3 34.Qf3 Qd6–/+) 34.Nf2?? (better 34.Nb2!?=) 34...Re8 (better 34...Rg2 35.Qd1 Rc8–+) 35.Rf5?? (35.Qf1 Rc8 36.Nd1 Rc1=+) 35...Rg3 (35...Qf5 A) 36.ef5?? Re2 37.d6 Rf5–+ (37...Rf2?! 38.d7 Rgg2 39.d8Q Kh7 40.Qd5–+); B) 36.Qf1 Qf4 37.h4–+) 36.Nd1?? (36.Qh5 Rg2 37.Qg6 A) worse 37...fg6 38.Rf3 (worse 38.Kg2 gf5 39.Kg3 fe4 40.Ne4 Rd8=+) 38...Rg5 39.Ng4+–; B) 37...Rg6=+) 36...h4 (better 36...Qf5! 37.Qf2 Qf2 38.Nf2 Re3–+) 37.Qf2?? (better 37.Qd2=) 37...Re6?? (37...Rd3 38.Nb2 Re3–+) 38.Nb2 (better 38.de6 fe6 39.Rf8 Kh7 40.Qd4 Rg2 41.e5+– (41.Qb6?? Qg3 42.Rh8 Kh8 43.Qd8 Kh7 44.Qh4 Qh4 45.Kg2 Qg5 46.Kf1 Qc1–+)) 38...Rf6 (38...Re8=) 39.Nc4 (better 39.Rf6!? Qf6 40.Qf6 gf6 41.Kh2=) 39...Rf5=+ 40.ef5 (40.ef5 Qf6 41.Qe2 Qf5 42.Qe8 Kh7 43.Qe4 Qe4 44.de4–/+). RichardSommer (2000) – kingquang (1950), lichess.org, 2020.

3.a4 f5 4.Bb2 d6 5.e3 Nf6 6.c4 Ne4 7.Nf3 g5 (7...Be7 8.d4=) 8.Nc3 (8.d3!? Nc5 9.d4+=) 8...g4= 9.Ne4 fe4 (worse 9...gf3 10.Ng3+–) 10.Ng1 Nd7 (10...Qf6 11.Ne2=) 11.Be2 (11.Qg4!? Nf6 12.Qd1+=) 11...Nc5= 12.d4 (12.Ba3 Nd3 13.Bd3 ed3=) 12...ed3=+ 13.Bd3 Qf6 (13...Bg7 14.e4=+) 14.Ne2 Bf5 (14...Bg7 15.0–0=) 15.Bf5= Qf5 16.0–0 h5 17.Ng3 Qg6 18.Qd5 (18.f4 gf3 19.Qf3 Bh6=) 18...h4=+ 19.Ne2 0–0–0 20.Nc3 (20.Bc3 Bg7=+) 20...Be7 (20...g3 21.fg3 hg3 22.h3–+) 21.Rad1 g3 (21...h3 22.g3=+) 22.fg3 hg3 23.h3 Rdf8 24.Rf8 Rf8 25.Rf1 (25.Ba3 Qf5 26.Qd2 Nb3–/+) 25...Rf1–/+ 26.Kf1 Qc2 (26...Bg5 27.Ke2 Qc2 28.Qd2 Qf5–+) 27.Nd1? (27.Qg8!? Bd8 28.Qg4 Kb8 29.Qe2–/+) 27...Nd3 (27...Na4 28.Qg8 Bd8 29.Qg4 Kb8 30.Qe2–+) 28.Qf3? (better 28.Qg8 Bd8 29.Qg4 Kb8 30.Qe2 Qc4 31.Bc3–+) 28...Nb2 (28...Qc4?! 29.Qe2–+) 29.Nb2 Qb2 30.Qg4 Kb8 The mate threat is Qf2 31.Qg3 Qc1 32.Ke2 (32.Kf2 Qc4 33.Qg7–+) 32...Qb2 (better 32...Qc4 33.Kf3 Qf7 34.Ke2 e4–+) 33.Kf3?? (33.Kf1 Qc3 34.Qg8 Ka7 35.Ke2–+) 33...Ka7 34.Qg7?? (better 34.Qg6–+) 34...Qg2 (better 34...e4 35.Ke4 Qg7–+) 35.Kg2+– Bh4 36.Qc7 Bg5 (36...Be7 37.Qe7 d5 38.Qc7 dc4 39.b6 Ka6 40.Qc5 c3 41.Qb5) 37.b6 (37.c5 Bd8 38.b6 Ka6 39.Qd6 e4 40.Qe6 Bb6 41.Qb6) 37...Ka6 38.c5 Bd8 (38...dc5 39.Qc5 Be3 40.Qb5) 39.Qd8 (39.Qd7 Bb6 40.Qb5 Ka7 41.cb6 Kb8 42.Qe8) 39...dc5 40.Qd6 e4 41.Qd3 (41.h4 c4 42.Qc5 c3 43.Qb5) 41...c4 (41...ed3 42.Kf2 c4+–) 42.Qc3 (42.Qb1 c3 43.Qb5) 42…Kb6+– (42...Kb6 43.Qc4 Ka7+–) 0–1. RichardSommer (2120) – O_Batzorig (2185), lichess.org, 2020.

3.Bb2 Qe7 4.a4 g6 5.f4 Bg7 6.Nf3 d6 7.fe5 de5 8.Ra3 (8.Ba3 Qf6 9.e4 Nd7+=) 8...Nd7= 9.g3 (9.Re3 Qe6 10.Ne5 Ne5 11.Be5 Be5+=) 9...Nh6 (9...Ngf6 10.Bg2 e4 11.Nd4–/+) 10.Bg2 (10.Nc3 Nb6 11.e4 0–0–/+) 10...0–0–/+ 11.0–0 (11.Rc3 e4 12.Ba3–+) 11...Nb6–+ 12.d3 Ng4 13.Bc1? (13.Qc1 Qc5 14.Kh1 Nf2 15.Rf2 Qf2–+) 13...Qc5 (13...Nd5!? 14.Qe1 Qc5 15.Kh1–+) 14.e3 (14.Kh1 Nf2 15.Rf2 Qf2–+) 14...Ne3 15.Be3 Qe3 16.Kh1 Qc5 17.c3 Bf5 18.d4 Qe7 19.Ra2 Nd5 20.Qd2 e4 21.Nh4 Bd7 22.Qe1 f5 23.Re2 Rae8 24.Bh3 c5 25.c4 Nb4 26.dc5 Qc5 27.Qf2 Qc4 28.Ng2 Bd4 29.Nd2 Qd3 30.Nf4 Bf2 31.Nd3 Nd3 32.Ne4 Be6 33.Ref2 Bd5 34.Rc2 Be4 35.Bg2 Bg2 36.Kg2 Ne1 (36...Ne1 37.Re1 Re1–+) 0–1. Levin,Anatoly – Elmore,John P (2050), Bedford Rating GpA, 2011.

3.Bb2 f6 (--> 1.b4 e5 2.Bb2 f6 3.b5 a5).

3.c4 Bb4 4.Nf3 d6 5.a3 =.

3.c4 Bc5 4.Nf3 =+.

3.c4 f5 4.e3 Nf6 5.Bb2 d6 6.a4 Be7 7.Nf3 0–0 8.d4 e4 9.Nfd2 c6 10.g3 (10.Be2 cb5 11.ab5 d5=) 10...d5 11.Nc3 Be6 12.Qb3 Nbd7 13.cd5 cd5 14.Rc1 Kh8 15.Be2 g5 16.0–0 f4 (16...g4!?=) 17.Nde4 Ne4 18.Ne4 f3 19.Bd1 Qe8 20.Nc5 Qh5?? (better is 20...Nc5 21.dc5 Kg8+/–) 21.Ne6 g4 (21...Qh3 22.Bf3! Qe6 23.Qd5 Qd5 24.Bd5+–) 22.Nf4 Rf4 23.ef4 Qh3 24.Bf3! gf3 25.Qf3 Nf6 26.Rfe1 Bb4 27.Bc3 Ng4 28.Qg2 Qh5 29.Bb4 ab4 30.f3 Nf6 31.Re5 Qg6 32.Qc2 Qg7 33.Qc7 Ra4 34.Qg7 Kg7 35.Re7 Kg6 36.Rb7 b3 37.Rb1 Ne8 38.Rd7 Rb4 39.Rd5 Nc7 40.Rd6 Kf5 41.b6 Nb5+– 42.Rd5 Kf6 43.Rb5! Rb5 44.Kf2 Rb6 45.Ke3 Rb4 46.Rb2 1–0. ludice (1710) – tomcior777 (1710), kurnik, 2011.

3.d4 c5 4.de5 a4 5.Nc3 c4 (5...d6 6.Nf3+/–) 6.e4+– Bb4 7.Qd4 Qa5 (7...d5 8.ed6 Be6 9.Bd2 (9.Bc4 Qc8 10.Qg7 Qc4+–) 9...Bd6 10.Nf3+–) 8.Bd2 Bc3 9.Bc3 Qb5 10.Bc4 Qc6 11.Bf7! Kf7 12.e6! de6 (12...Qe6 13.Qg7) 13.Qg7 Ke8 14.f3 Nf6 (14...Qd7+–) 15.Qh8 Kd7 16.Qg7 Kd6 17.Bb4 Ke5 18.0–0–0 Nbd7 (18...Qc2 19.Kc2 Kf4 20.Qf6 Ke3 21.Bc5#) 19.Qg5# (19.Qg3#) 1–0. Pierred (2200) – Guest242525, Friendly Game, 3m + 0s, 2005.

3.d4 ed4 4.Qd4 Nf6 5.e4 d5 6.Bg5 de4 7.Qd8 Kd8 8.Nc3 Bf5 9.Bc4 Bb4 10.Nge2 Bg6 11.a3 Bd6 12.Bd5 c6 13.Be4 Re8 14.Bf6 gf6 15.Rd1 Kc7 16.b6 Kb6 17.Bg6 Be5 18.Na4 Kb5 19.Bf7 Re7 20.Bb3 (20...Ka6 21.0–0+–) 1–0. kamret (2225) – SDR84 (1995), GameColony.com, 2003.

3.d4 Bd6 4.g3 ed4 5.Qd4 Nf6 6.Nf3 0–0 7.Bg2 Re8 8.0–0 Re2 9.Nc3 Re8 10.Nd5 Be7 11.Bb2 c6 12.Ne7 Re7 13.Qf4 Nd5 14.Qh4 f6 (14...cb5? 15.Qg5 Qf8 16.Qd5+–) 15.Nd4 d6 16.bc6 Nc6?? (better 16...Nb4+=) 17.Bd5+– Kh8 18.Nc6 bc6 19.Bf6! (worse 19.Bc6 Bb7 20.Bb5 Qc7+–) 19...cd5 (19...gf6 20.Qf6 The nicest combinations are those leading to mate) 20.Be7 Qd7 (20...Qc7 21.Rfe1 Bf5 22.Qd4+–) 21.Rfe1 Bb7 (21...Ba6 22.Qf4+–) 22.Rab1 (better 22.Bf6 gf6 23.Qf6 Qg7 24.Qg7 Kg7 25.Re7 Kf6 26.Rb7 Rc8+–) 22...Qc6 (22...Bc6+–) 23.Bf6! d4 Threatening mate: Qg2 (23...gf6 24.Re7 A double attack) 24.Bg7! Kg8 (24...Kg7 Decoy to g7 25.Re7 Theme: Double Attack) 25.Rb7! Qb7 26.Bh6 Qf7 (26...Qa7 27.Re7 Rd8 28.Qg5 Kh8 29.Qg7) 27.Re7 Qa2 (27...Qf5 28.Qd4 Qf7 29.Qg4 Qg6 30.Qc4 Kh8 31.Qd4 Kg8 32.Qd5 Kh8 33.Qa8 Qg8 34.Bg7) 28.Qg4 (28.Qg4 Kh8 29.Qg7) 1–0. marekt – bgnagy, net–chess.com, 2020.

3.e3 a4 4.Bb2 Nf6 (4...d6 5.d4 e4 6.d5=) 5.a3 (5.Be5 d5+=) 5...d5 (5...d6!?=) 6.Be5+= Bg4 7.Nf3 Bd6 8.Bd6 Qd6 9.c4 Na6?? (9...dc4 10.Bc4 0–0 11.d4+–) 10.Nc3 (better 10.ba6 Qa6 11.cd5 Qd6+–) 10...Nd7?? (10...Nc5 11.d4 Nb3+–) 11.Na2 (11.ba6 Ra6 12.cd5 Ra5+–) 11...c6?? (11...Nac5 12.d4 Nb3 13.c5 Ndc5 14.dc5 Qc5 15.Rb1+=) 12.Nc3 (better 12.ba6 ba6 13.cd5 cd5 14.h3+–) 12...dc4? (12...Nc7 13.bc6 (13.Na4?! Bf3 14.gf3 dc4=) 13...Qc6 14.cd5 Nd5 15.Rc1+–) 13.Bc4 (13.ba6!? b5+–) 13...cb5 14.Nd5?? (better 14.Bf7 Kf7 15.Ng5 Kg8 16.Qg4+–) 14...Ndb8 (better 14...bc4 15.Nc3 Nac5–+) 15.Bd3?? (15.Bd3 Qd5 16.Qb1–+; better 15.Bb5 Nd7 16.Nf4+–). RichardSommer (1980) – magoo21 (1955), lichess.org, 2020,

3.e3 Nf6 4.a4 d5=+ 5.Bb2 Be6 (better 5...Bd6!?=+) 6.Be5+= Nbd7 7.Bb2 Bd6 8.c4 (8.Nf3!?+=) 8...0–0 (8...dc4 9.Nf3=+) 9.c5 (better 9.cd5 Nd5 10.Nc3=) 9...Bh3?? (better 9...Nc5 10.Nf3 Bf5=+) 10.f3 (10.cd6 Be6+–) 10...h6? (10...Bg2 11.Bg2 Bc5 12.Ne2+–) 11.Nc3 (better 11.cd6!? Bf5+–) 11...Be7 (better 11...Bg2 12.Bg2 Bc5+–) 12.Kf2?? (12.Nh3 Bc5 13.d4 Bb4+–) 12...Ne8?? (better 12...Be6 13.d4 c6+–) 13.Qe1 (better 13.Nh3 Nc5 14.d4+–) 13…Bh4 1–0. RichardSommer (2160) – Juniorista (2160), lichess.org, 2020.

3.e4 b6 4.Nf3+= d6 5.Bc4 h6 6.Nc3 Bg4 (6...Nf6 7.0–0+–) 7.h3 (7.Ne5 de5 8.Qg4 Nf6+–) 7...Bh5 (7...Be6 8.Be6 fe6 9.Qe2+–) 8.g4 (better 8.Ne5!? Nd7 9.Qh5 Ne5 10.Bb3+–) 8...Bg6+= 9.d4 Be7 (better 9...Nd7!?+=) 10.de5+– Nd7 11.e6 (11.Qd5!?+–) 11...fe6+– 12.Be6 Nc5 (better 12...Bf6!? 13.Nd4 Ne7+–) 13.Bd5+– Nf6 14.Ba8 (14.Bc6!? Kf8 15.Qe2 Ra7+–) 14...Qa8+– 15.Nd5 (better 15.Rf1 Be4 16.Ne4 Qe4 17.Qe2 Qb4 18.Bd2+=) 15...Nce4?? White creates threats along the open e–file (15...Nd5 16.ed5 Bf6=) 16.Ne7 (better 16.Nc7 Kf7 17.Na8 Ra8 18.g5 hg5 19.Ng5 Ng5 20.Bg5+–) 16...Ke7?? (16...Nc3 17.Ng6 Nd1–+) 17.0–0+– Re8 18.Bb2 Kf7 19.Re1 h5? (19...Kg8 20.c4+–) 20.Bf6 (better 20.g5 Qd5 21.gf6 Qb5 22.Rb1 gf6 23.Bf6+–) 20...gf6 21.Qe2 (21.Nh4 Bh7+–) 21...Kf8 22.Nh4 Bf7 (22...Ng3 23.Qf3 Qf3 24.Nf3 Ne2 25.Kf1+–) 23.Qe3+– Ng5 24.Qc3 Kg7? (24...Qd8 25.Re8 Ke8 26.Re1 Kf8 27.gh5 Bh5 28.f4+–) 25.Re8 (25.f4 Ne6 26.Nf5 Kg6+–) 25...Qe8 26.Re1 Qd8? (26...Qb5 27.f4 Nh7 28.Qc7 Qc5 29.Qc5 dc5+– (29...bc5?? 30.Nf5 Kg8 31.gh5+–)) 27.Nf5 Kg6 28.Re7 (28.Qd3!? Qa8 29.f4 Nf3 30.Qf3 Qf3 31.Nh4 Kg7 32.Nf3 hg4 33.hg4 Ba2 34.Re7 Kf8 35.Rc7 Ke8+–) 28...hg4 29.hg4 Qa8 (29...Qh8 30.Rc7 (30.Qc7 Qh3 31.Re3 Qg4 32.Ng3 Bd5=) 30...Qh3 31.Qh3 Nh3 32.Kg2 Nf4 33.Kg3+–) 30.Qc6 (better 30.Nh4 Kg7 31.f4+–) 30...Qh8 31.Qg2 (31.Qc7 Qh3 32.f3 Nf3 33.Kf2 Ne5 34.Re5 de5=) 31...Nh3 32.Kf1 Nf4 33.Qf3 Nd5 (33...Qh3 34.Qh3 Nh3 35.Rc7+–) 34.Rf7! Kf7 Decoy to f7 35.Qd5 Kf8 (35...Kg6+–) 36.Qa8 (36.Qa8 Kf7 37.Qh8 Ke6 38.Qg8 Ke5 39.Qc4 d5 40.f4 Ke6 41.Qc7 d4 42.Ng7 Kd5 43.Qc6) 1–0. wvmaniac – bolu, net–chess.com, 2020.

3.e4 Bc5 4.Bc4 Nf6 5.Nf3 0–0 6.d4 ed4 7.Nd4 Ne4 8.0–0 d5 9.Bd3 Bd4 10.Be4 de4 11.c3 (withdraw) 1–0. guest206 – guest523, ICC, 1999.

3.e4 Nf6 4.Nc3 Bc5 5.h3 d5 6.ed5 0–0 7.Bc4= c6 8.dc6 Bf2 9.Kf2 Qd4 10.Kf1 Qc4 11.Qe2 Qc5 12.a4+= Re8 13.Ba3 Qb6 14.cb7 Bb7 15.Qf2 Qd8 16.Rc1 Nd5 17.Nge2 Re6 18.Nd5 Qd5 19.Nc3 Qc4 20.Kg1 Nd7 21.Rf1 Rg6 22.Rh2 Rf6 23.Qe1 Qe6 24.Rf6 Qf6 25.Qf2 Qg6 26.d3 f5 27.Bc1 f4 28.Qh4 Rc8 29.Bd2 f3 30.g3+/– Qb6 31.Rf2 Nf6 32.Be1 Qe3 33.Bd2 Qc5 34.Qg5 Qd4 35.Qh4 e4 36.Qf4 Rc3 37.Bc3 Qc3 38.Qb8 Bc8 39.de4 Ne4 40.Rf3 Qf3 41.Qc8 Kf7 42.Qd7 Kg6 43.Qg4? Qg4–+ 44.hg4 Nc5 45.b6 Kf6 46.Kf2 Ke5 47.g5 Kd5 48.Ke3 Kc6 (48...Na4?? 49.b7 Nc5 50.b8Q+–). Rogers,Henry – Amir,Jacob, IECG, 2004.

3.Nf3 e4 4.Ne5 d6 =+.

3.a4 Bc5

4.Bb2 d6 5.e3 Nf6 6.c4 0–0 7.Ne2 Bg4 8.Ng3?? (8.f3 Be6=+) 8...Nbd7 (8...Bd1 9.Kd1 d5 10.Ke1–+) 9.d4?? (better 9.Be2!? Be2 10.Qe2=) 9...ed4 (better 9...Bd1 10.dc5 Bc2 11.cd6 cd6 12.Nc3–+) 10.Kd2?? (better 10.f3 Bb4 11.Ke2–/+) 10...Re8 (10...de3 11.fe3 Bd1 12.Kd1–+) 11.b6 (11.Be2 de3 12.fe3 Be2 13.Qe2 Re3–+) 11...Nf8 (better 11...de3 12.fe3 Bd1 13.bc7 Qc7 14.Kd1 Ng4–+) 12.Be2 (12.bc7 de3 13.Kc1 Qc7 14.f3–+) 12...N6d7 (12...de3 13.Kc1 Be2 14.Qe2 ef2 15.Qf3–+) 13.Bc3?? (13.Bg4 de3 14.fe3 Nb6=+) 13...Qb8 (13...dc3 14.Nc3 Be6 15.bc7 Qc7 16.Qb3–+) 14.Qc1?? (14.ed4 Be2 15.bc7 Qc7 16.Ne2–/+) 14...g5 (14...dc3 15.Nc3 Be6 16.bc7 Qc7 17.Nd5 Bd5 18.cd5–+) 15.Qg1?? (better 15.ed4!? Be2 16.bc7 Qc7 17.Ne2=) 15...c6 (15...dc3 16.Nc3 Be2 17.bc7 Qc7 18.Nge2–+) 16.Kc2?? (better 16.Bg4 dc3 17.Nc3 Nb6 18.Qf1–/+) 16...Bf3 (16...Be2 17.ed4 Bb6 18.Ne2 Re2 19.Kd1–+) 17.Na3?? (better 17.gf3!? dc3 18.Ne4=) 17...Bh5 (17...Be2 18.Bd4 Bd4 19.ed4 Nb6 20.Qc1–+) 18.Qd1?? (18.Nh5 dc3 19.h4–/+) 18...Ng6 (better 18...Bg6 19.Bd3 dc3–+) 19.Bb2?? (19.Nh5 dc3 20.Bg4 Nb6 21.Nf6 Kg7 22.Ne8 Qe8 23.Kc3 Qe5 24.Kb3 Ba3 25.Ra3 Nc4 26.Ra2–/+) 19...Rf8?? (better 19...Be2 20.Qe2 Nb6–+ (20...Bb6?! 21.Qg4–+)) 20.Qe1?? (better 20.Bh5 de3 21.Nf5+–) 0–1. RichardSommer (1995) – GitFlagg3d (1980), lichess.org, 2020.

4.Bb2 Bf2 (better is 4...d6=) 5.Kf2+– c6 (5...Nf6 6.Nf3 e4 7.Nd4 Ng4 8.Kg1+–) 6.Nf3 d6 7.c4 Nf6 8.e3 0–0 9.Be2 Ng4 10.Ke1 (10.Kg1 Be6+–) 10...d5 (10...f5!?+–) 11.h3 dc4? (11...Nf6 12.Be5 Nbd7+–) 12.hg4 Bg4 13.Be5 (< 13.Ne5 Be2 14.Qe2 cb5 15.ab5 Nd7 16.Nc4 Nf6+–; < 13.Bc4 Bf5+–) 13...Bf3 14.Bf3 Nd7 15.Bg3 Nf6 16.Nc3 Qd3 (16...Qe7 17.bc6 bc6 18.Kf1+–) 17.Be2 (better is 17.Qb1 Rac8+–) 17...Qf5 18.Bc4 Ne4 (18...Qc5 19.Qb3+–) 19.Rf1 (19.Bd3 Qg6 20.Ne4 f5+–) 19...Nc3 (19...Qg6 20.Ne4 Qe4 21.Qb3 Qg2 22.Bf7 Kh8 23.Bd6+–) 20.dc3 (better is 20.Rf5 Nd1 21.Rd1 Rac8+–) 20...Qc5 (20...Qe4 21.Qd4 Qg2 22.Bd6+–) 21.Qe2 (better is 21.Qd4 Qh5+–) 21...Rfe8 (21...cb5 22.Bb5 Qc3 23.Kf2+–) 22.Bf4 (22.Bf7 Kh8 23.Be8 Re8+–) 22...cb5 (22...Re7 23.Rd1 cb5 24.Bd6+–) 23.Bb5 (better is 23.Bf7 Kh8 24.Be8 Re8 25.Qb5 Qe7+–) 23...Qc3 24.Kf2 Re6 25.Rac1 Qf6 26.g3 (26.Kg1 Qh4+–) 26...Qf5 (26...Rf8 27.Bc4 Rc6 28.Kg1+–) 27.Qf3 (27.Bd7 Qf6 28.Be6 Qe6+–) 27...Rf6 28.Qb7 Rd8 (28...Rf8 29.Kg2 Qe6 30.Bc4+–) 29.Qf3 (29.Bd7! Qe5 30.Kg2 Qe7+–) 29...Rd2 (29...g5 30.e4 Qg6 31.Rg1+–) 30.Kg1 Qh3 (30...Rd8+–) 31.g4 (31…Qf1 32.Bf1+–; 31.Qa8 Qc8 32.Qc8 Rd8 33.Qd8#) 1–0. stoker – PolandOVII, Live Game Caissa's Web, 2004.

3.Bb2 Bb4

4.Be5 d6?? 5.Bg7+– f6 (5...Nf6 6.Bh8 d5 7.Nf3+–) 6.Bh8 Bf5 (6...Nh6 7.e4 Nf7 8.a3+–) 7.a3 Bc5 8.d4 Bb6 9.e3 Be4 (9...Nd7 10.Qf3 Ne7 11.Nc3 Bc2 12.Bc4+–) 10.Nc3 a4 (10...Bg6 11.Bc4 Nh6 12.Qf3+–) 11.Ne4 d5 12.Qh5 (better 12.Qg4 Ba5 13.Kd1 de4 14.Qg8 Kd7 15.Qg4 Ke8 16.Qh5 Kd7 17.Qf5 Ke8 18.Bf6 Qf6 19.Qf6+–) 12...Ke7 13.Qh7 Ke6 14.Nh3 Ba5 15.Kd1 de4 (15...Ne7 16.Nc5 Kd6 17.Qg7 Ng6 18.Nb7 Ke6 19.Nd8 Kd6 20.Qf7 Nh8 21.Nb7) 16.Ng5! Kd6 (16...fg5 17.Bc4 Mate attack) 17.Ne4 Ke6 18.Bc4 (18.Bc4 Qd5 19.Bd5 Kd5 20.Qg8 Ke4 21.Qe6) 1–0. DEFFM – GuestPLVW, freechess.org, 2019.

4.Be5+= Nf6+=.

4.Be5+= Nh6?? 5.Bg7+– Bd6 (5...Rg8 6.Bh6 Qf6+–) 6.Bh8 (6.Bh6?! Qf6 7.Nc3 Qh6+–) 6...c6 (6...Be7 7.e4+–) 7.e4 Qe7 8.Nc3 Be5 9.Be5 Qe5 10.d4 Qd6 11.Rb1 Qa3 12.Rb3 Qd6 13.Na4 Qf6 14.Nb6 c5 15.Na8 cd4 16.Rf3 Qd6 17.Rc3! Qb4 18.Nc7 Kd8 19.Nd5 (19...Qc3 20.Nc3 dc3 21.Qd6+–) 1–0. pierre – BallBreaker, ChessHere.com, 2006.

3.Bb2 b6

4.Be5 d6 5.Bb2 Nf6 6.e3 Nbd7 7.Be2 Be7 8.Nf3 h6 9.0–0 0–0 10.Nd4 Bb7 11.Bf3 Bf3 12.Nf3 d5 13.a4 Bd6 14.d3 Re8 15.Re1 Ng4 16.h3 Re3 17.fe3 (17.Re3?! Ne3 18.fe3 Qe7+–; 17.hg4?! Re1 18.Qe1 Rc8+–) 17...Bh2 (17...Ngf6+–) 18.Nh2 Qh4 (18...Nh2 19.Kh2 Qg5+–) 19.Ng4 f5 20.Ne5 Nf8 21.Nc3 Re8 22.Nd5 Re5 23.Be5 Ng6 24.Bc7 (24...Nf8 25.Bb6+–) 1–0. Richard,Andy – Shinn,Samuel E, IECG, 1999.

4.Be5 Qe7 5.Bb2 d6 6.Nf3 f6 (6...Nd7 7.c4+/–) 7.a4 g6 (7...d5 8.e3+–) 8.e3 Bh6 (8...Qf7 9.Ng5 Qd5 10.Qf3 Qf3 11.Nf3+–) 9.Bc4 Be6 10.Be6 Qe6 11.0–0 (11.Nd4 Qf7+–) 11...Nd7 12.Re1 0–0–0 (12...Bg7 13.Nd4 Qf7 14.Nc3+–) 13.Nd4 Qd5 (13...Qf7 14.d3+–) 14.Nc6 (14.Nc3!? Qb7+–) 14...Re8 15.Nc3 Qe6 (15...Qg5 16.Qf3+–) 16.d4 (16.Nd4 Qf7+–) 16...Ne7 17.Ne7 Qe7 18.Ne2 f5 19.c4 g5 20.d5 (20.Rc1 f4+–) 20...g4 (better is 20...Bg7 21.Nd4 Bd4 22.Bd4 Rhf8+–) 21.Bh8 Rh8 22.Nd4 Rf8 23.Nc6 Qe4 24.Rc1 Re8 25.g3 (better is 25.Qe2!? Nc5 26.Red1 Bg7+–) 25...Ne5 26.Ne5 Re5 27.f4?? (27.Qc2 Bg7+–) 27...Re7?? (better is 27...gf3 28.Qb3 Be3 29.Re3 Qe3 30.Qe3 Re3=+) 28.Qb3 (28.Qc2 Bg7+–) 28...Bg7 29.c5 (29.Qc2 Kd7+–) 29...bc5 (29...dc5 30.Qc4 Bb2 31.Qe4 Re4+/– (31...fe4? 32.Rc2 Bf6 33.h3+–)) 30.Rc4?? (better is 30.b6+–) 30...Qf3 (30...Qd5 31.b6 Bd4=+) 31.b6 Qd5 32.Rd1 (better is 32.bc7 Kc7 33.Rb1+/–) 32...Qc6? (32...Re3 33.Rd5 Rb3 34.Rf5=+) 33.e4?? (better is 33.bc7 Kc7 34.Qd3+–) 33...fe4 (33...Qb6 34.Qb6 cb6 35.Rd6 fe4 36.Rb6 Bd4 37.Kf1 Rb7 38.Rc6 Kb8 39.R6c5 Bc5 40.Rc5 Rb3+/–) 34.b7 (better is 34.bc7 Rc7 35.Rb1=) 34...Qb7–+ 35.Qc2 (better is 35.Qe3–+) 35...Bd4 36.Kf1 (36.Rcd4 cd4 37.Qa2–+) 36...e3 37.Qe2 (37.Qf5 Kb8 38.Rb1 e2 39.Ke1 Bf2 40.Kd2 e1Q 41.Re1 Qb2 42.Qc2 Be1 43.Kd1–+) 37...Qb3 (37...Qh1) 38.Qg4=+ Kb7 39.Qf3?? (39.Qe2 Re8=) 39...c6 (better is 39...d5 40.Qe2 Qc4 41.Rb1 Ka6 42.Qc4 dc4–+) 40.Qe2= h5 41.Rcc1 Qa4 42.Rb1 Kc7 43.Kg2 Re6 (43...d5 44.Rd3–/+) 44.Qa6 (44...Qc2 45.Kh3 Qf5 46.Kg2 Qd5 47.Kh3 Qf5 48.Kg2 Qe4 49.Kh3 Qf5=) =. maii – koniland, Live Game Caissa's Web, 2004.

4.Be5 Qe7 5.Bc7 d5 6.Bg3 Nf6 +–.

3.Bb2 Bd6

4.e3 f5 5.a4 Nf6 6.c4 (6.Nf3 e4 7.Nh4 g6=) 6...b6 (6...e4 7.d4=) 7.Nf3 Qe7 8.Be2 Bb7 9.0–0 0–0 10.Nc3 Bb4 11.d4 d6 (11...e4 12.Nd2=) 12.Rc1 (12.Na2 Bf3 13.Bf3 e4+–) 12...Nbd7 13.Qb3 Kh8 (13...ed4 14.ed4 Bc3 15.Qc3 Qe2 16.Rfe1 Bf3 17.gf3=) 14.de5 de5 15.Nd5 Nd5 16.cd5 Nc5 Black prepares f4 17.Qa2 Rad8 18.Bc4 (worse 18.Be5 Bd5 (18...Rd5?! 19.Bf4=) 19.Qa1 Rde8–/+) 18...e4 19.Nd4 f4 20.ef4 Rf4 21.Nc6 (21.Rc2 e3=) 21...Bc6=+ 22.dc6 Rdf8 (22...Rd2 23.Rcd1 e3 24.Rd2 ed2–+) 23.Bd4= Nd3 24.Bd3 ed3 25.Be3 R4f6 26.Rcd1 (better 26.Qc4 Rd6 27.Rfd1=) 26...Qf7?? (better 26...Qe4–/+) 27.Qf7+– R6f7 28.Rd3 h6 29.Rfd1 Bc5 30.Bc5 bc5 31.f3 Rf4?? (31...Kh7+–) 32.Rd8 Kh7 33.Rf8 (better 33.b6 R8f6 34.b7+–) 33...Rf8 34.Rc1 (34.Rd5 Kg6+–) 34...Rf4 35.Rc5 Ra4 (35...Rb4+–) 36.b6! cb6 37.c7 (37.c7 bc5 38.c8Q+–) 1–0. BeepBeepImAJeep (2710) – speedytiger301 (2435), lichess.org, 2019.

4.Nf3 c6 (better is 4...Qe7!?=) 5.Ne5+/– f6 6.Nf3 cb5 7.e4 b6 (7...b4!?+/–) 8.Bb5+– Qe7 (8...Bb7 9.0–0+–) 9.Nc3 Bb4 10.0–0 Qf7 (better is 10...Bc3 11.Bc3 Ba6+–) 11.Nd5 Bd6 (11...Ra7+–) 12.Bc4 (12...Qg6 13.Nb6+–) 1–0. bostvinnik (2395) – feliperigo, net–chess.com, 2005.

3.Bb2 Qf6

4.e3 Bd6 (better 4...d5!?+–) 5.f4!+– c6 (5...ef4 6.Bf6 Pinning (6.Bf6 Deflection)) 6.a4 (6.Nf3 Bc7 7.fe5 Qh6+–) 6...Bc5 (6...Ne7 7.Nf3 Ng6 8.Bc4+–) 7.Nf3 Be3?? (better 7...d5+–) 8.de3 ef4 (8...Qh6 9.Be5 Ne7+–) 9.Bf6 Nf6 10.Qd6 1–0. GuestGJBH – GuestPHTM, freechess.org, 2019.

4.Nf3 Bc5 5.Be5 Qf5 6.Bg7 Nf6 (6...Bf8 7.Bh8 Qb5 8.Nc3+–) 7.Bh8 1–0. DEFFM – GuestSJZJ, freechess.org, 2018.

3.Bb2 Nf6

4.Be5 d6 5.Bb2 Be6 6.e3 Nbd7 7.Be2 d5 8.Nf3 a4 9.Nd4 Bd6 10.Ne6 fe6 11.Nc3 a3 12.Bc1 Bb4 13.Bh5 Ke7 (13...Nh5 14.Qh5 g6 15.Qg4+=) 14.Be2 Kd6 (14...Rf8!?+=) 15.0–0 Bc3 16.dc3 Ne4 17.Qd4 (17.Bd3 Ndc5 18.c4+–) 17...e5? (better 17...Ndc5!? 18.c4 Qf6+–) 18.Qb4 Ndc5 (18...Ke6 19.c4 d4+–) 19.f3?? (better 19.Ba3 Qb8 20.Rfd1+–) 19...Ra4= 20.Qb1?? (better 20.Ba3 Rb4 21.cb4=) 20...Qh4 (better 20...Nc3 21.Bd2 Nb1 (21...Ne2?! 22.Kf2–+) 22.Rab1 Ke6–+) 21.fe4+– Qe4 22.Bf3 (22.c4 dc4 23.Bf3 Qg6 24.Ba3 Ra3+–) 22...Qh4 (22...Qc4 23.Bd2+–) 23.g3 (23.e4!? Ne4 24.Ba3 Ke6+–) 23...Qc4 24.Bd5 Qd5? (24...Qd5 25.Ba3 Combination; 24...Kd5 25.Bd2 Combination) 25.Rd1?? (better 25.Ba3 Ke6 26.Rd1+–) 25...Ne4 (25...Qd1 26.Kg2 Qe2 27.Kg1 Qe1 28.Kg2 Rf8 29.Ba3 Rf2 30.Kh3 Rh4 31.Kh4 Rh2 32.Kg4 Qe2 33.Kg5 Qh5) 26.Rd5+– Kd5 27.Qb3 Kd6 28.Ba3 (better 28.Qa4 Nd2+–) 28...Nc5 29.Bc5 (29.Qf7 Rf8 30.Rd1 Rd4 31.Qf8 Kd7 32.Qf7 Kd8 33.cd4 b6 34.dc5 Kc8 35.c6 Kb8 36.Rd8 Ka7 37.Qc7) 29...Kc5 30.Qa4 Rd8 31.Qb4 (better 31.Qa7 Kc4+–) 31...Kd5 32.Rd1 (32.Rd1 Ke6 33.Qg4 Ke7 34.Qg7 Ke8 35.Rf1 Rd1 36.Qe5 Kd7 37.Rd1 Kc8 38.Qe8) 1–0. Atotheking (1700) – BombWire (1700), lichess.org, 2020.

4.Be5 d6 5.Bb2 Be7 (5...d5 6.e3+=) 6.e3 0–0 7.Nc3 (7.Nf3 Be6+–) 7...b6 (7...d5 8.Nf3+–) 8.Nf3+– Bb7 9.Be2 Nbd7 10.0–0 Re8 11.Nd4 Nc5 12.Bf3 Qc8 (12...d5 13.Nf5+–) 13.Nc6 Bf8 14.Ne2 (14.d4 Nce4 15.Ne4 Ne4+–) 14...Nfe4 (14...Qf5 15.Nf4 Ne6 16.Ne6 fe6 17.c4+–) 15.Ned4 Qd7 (15...Nf6 16.d3+–) 16.d3 (16.Bg4 Ne6+–) 16...Nf6 (16...Ng5 17.Bd5+–) 17.e4 (17.c4 a4+–) 17...g6 (17...Na4 18.Qc1+–) 18.g3 (18.c3 Bg7+–) 18...Bg7+– 19.c4 Rec8 (19...a4 20.a3+–) 20.Qc2 (20.Re1 Re8+–) 20...Ne8 (20...Re8 21.Rfe1+–) 21.Bg2 (21.Rad1 Ne6+–) 21...Bc6 22.Nc6 (22.bc6 Qg4+–) 22...Bb2+– 23.Qb2 Ne6? (better 23...Nd3!? 24.Qc3 Nc5+–) 24.d4 White plans e5 24...Nd8 (24...N8g7+–) 25.h4?? (better 25.e5+–) 25...Nc6+– 26.bc6 Qe7 (26...Qc6 27.e5 Qc4 28.Ba8 Ra8 29.Rac1+–) 27.e5 (27.Rae1 Ng7+–) 27...de5 28.de5 Rd8 29.Rad1 Ng7 (29...Rd1 30.Rd1 Rd8 31.Rd5+–) 30.Rd7! Rd7 31.cd7 Rd8 32.Bc6 Ne6 33.Rd1 Nc5 34.Qd4 (34.Bb5+–) 34...Ne6 (34...Qe6!? 35.Qd5 Kf8+–) 35.Qd5 Nc5 36.f4 (36.a3 a4+–) 36...Kg7 (36...Na6 37.Bb5 Nb4 38.Qb7 Qc5 39.Kh1+–) 37.h5! Qe6? (37...gh5 38.f5 Combination) 38.Qe6+– fe6 39.hg6 hg6 40.Kg2 Kf7 41.Kf3 Ke7 (41...Na6 42.Rh1 Kg7 43.a3+–) 42.Rh1 Nd7 (42...Rg8+–) 43.Rh7 Ke8 (43...Kf8 44.Rd7 (worse 44.Bd7 Kg8 45.Re7 Kf8 46.Re6 Rd7+–) 44...Rd7 45.Bd7+–) 44.Kg4 b5 (44...Kf8 45.Rd7 Rd7 46.Bd7+–) 45.Kg5 bc4 46.Kg6 c3 (46...Kf8 47.Bd7 Rd7 48.Rd7 Ke8 49.Rc7 Kd8 50.Rc4 Ke7 51.Rc5 a4 52.g4 a3 53.f5 Kd7 54.Kf6 ef5 55.gf5 Ke8 56.Rd5 Kf8 57.Rd8) 47.Rh8 (47.f5 ef5 48.e6 c2 49.ed7 Kf8 50.Rf7 Kg8 51.Re7 Rf8 52.Bd5 Kh8 53.Rh7) 47...Ke7+– 48.Rh7 Ke8 49.Ba4 (49.f5 ef5 50.e6 c2 51.ed7 Kf8 52.Rf7 Kg8 53.Re7 Rf8 54.Bd5 Kh8 55.Rh7) 49...c2 (49...c6 50.Kg5 Nc5 51.Rh8 Ke7 52.Rd8 Kd8+=) 50.Bc2 (better 50.Rh8 Ke7 51.Rd8 Kd8 52.Bc2+–) 50...Nc5?? (better 50...Nf8 51.Kf6 Nh7 52.Bh7 Rd2 53.Ke6 Ra2=) 51.Rh8 Ke7 52.Rh7 Ke8 53.Rf7 (better 53.Rc7 Rd5 54.Kf6+–) 53...Nd7?? (better 53...Rd2 54.Bb3 a4+–) 54.Rf6 Nf8?? (54...Nf6 55.ef6 Passed pawn) 55.Kg7+– Nd7 (55...Rd2 56.Rf8 Kd7 57.Ba4 c6 58.Rf7 Kd8 59.Bb3+–) 56.Bg6 (56.Re6) 56...Ke7+– 57.Rf7 Ke8 58.f5 (better 58.Bh5 Rb8 59.f5 Ne5 60.Rf8 Kd7 61.fe6 Ke6 62.Rb8 c5+–) 58...Ne5 59.Rc7 (59.Rc7 Ng6 60.fg6+– (60.Kg6?! Rd3+–)) 1–0. FeegLood (2770) – toivok (2775), lichess.org, 2017.

3.Bb2 Qg5

4.Nf3 Qf5 5.Be5 d6 6.Bb2 (6.Bd4!?+/–) 6...Qb5= 7.Bd4 Bf5?? (7...Nc6!?=) 8.Nc3 (better is 8.e4 Qd7 9.ef5 Qf5 10.Nc3+–) 8...Qb2?? (better is 8...Qd7+/–) 9.e4 (9.Nd5 Qc2 10.Qc2 Bc2 11.Nc7 Ke7 12.Na8 Nc6+–) 9...Bg4 (9...c5 10.Rb1 cd4 11.Rb2 dc3 12.Rb7 cd2 13.Qd2 Bd7+–) 10.Be2 (10.Nb5 Bf3 11.Qf3 Qa1 12.Ba1 Na6+–) 10...Qb4?? (better is 10...Bf3 11.Bf3 Qb4+–) 11.Rb1 (11.a3 Qb2+–) 11...Qa3 (11...Bf3 12.Rb4 ab4+–) 12.Rb3 d5 (12...Qb3 13.ab3 Ne7 14.Bc4+–) 13.Ra3 Ba3 14.Bg7 de4 15.Ne4 (15...f5 16.Nc3+–) 1–0. coloplayah (1935) – colamiju, net–chess.com, 2005.

4.Nf3 Qh5 5.Be5 d6 6.Bc3 Qb5 7.e4 Qc6 8.Nd4 Qe4 9.Be2 Qg2 10.Bf3 Qg5 11.Qe2 Be7 12.Nb5 Na6 13.d3 Qb5 14.Bg7 Be6 15.Bh8 0–0–0 16.Nc3 Qb4 17.a3 Qb2 18.Kd2 Bg5 19.Qe3 Be3 20.fe3 Nc5 21.Ra2 Qb6 22.Rb1 Qa6 23.Rab2 b6 24.d4 Ne7 25.Bf6 Kd7 26.dc5 dc5 27.Ne4 Ke8 28.Ke1 Bd5 29.Be2 Be4 30.Ba6 Rd6 31.Be7 Ke7 32.Rd1 Rh6 33.Rd2 f5 34.Rf2 Ke6 35.Bd3 Ke5 36.Be4 Ke4 37.c3 Rd6 38.Rbe2 Rd3 39.Rf4 Ke5 40.c4 Ra3 41.Ref2 Re3 42.Kd2 Re4 43.Rf5 Kd4 44.R5f4 Rf4 45.Rf4 Ke5 46.Rh4 a4 47.Kc2 b5 48.cb5 Kd5 49.Ra4 1–0. jura1946 – sylwekf, kurnik, 2012.

3.c4 d5

4.cd5 Nf6 =.

4.e3 Nf6=+ 5.Bb2 Bd6 6.Be2 c5 (6...0–0 7.c5 Bc5 8.Be5=+) 7.a4 (7.cd5 Nd5 8.Nf3 e4=+) 7...0–0–/+ 8.Na3 (8.Nf3 e4 9.Ne5 dc4 10.Nc4 Nd5=+) 8...Nbd7 (8...Be6 9.Nf3 e4 10.Ng5–/+) 9.Qc2 d4 10.d3 de3 11.fe3 b6 (11...e4 12.Rd1=+) 12.e4 (12.Nh3 Nb8=+) 12...Bb7 (12...h6 13.Nf3=+) 13.Nf3= Ng4 14.Bc1 f5 15.0–0 fe4 (better is 15...Qf6=) 16.Bg5 (better is 16.de4!? Qc7 17.Bd3=) 16...Ndf6 (16...Be7 17.Be7 Qe7 18.de4–+) 17.Nd2–/+ ed3 18.Bd3 Qd7 19.Bf5 Qc7 20.h3 h6–/+ 21.Be6 Kh8 22.hg4 hg5 23.Qg6 Rae8 24.Bf5 Rd8 25.Nc2 Be7 26.Nf3 Bf3 27.Rf3 Rd6 28.Rh3 Kg8 29.Qg5 e4 30.Ne3 Ne8 31.Bh7+– Kf7 32.Rf1 Ke6 33.Qg6 Kd7+= 34.Qe4 Rf1 35.Kf1 Nf6?? 36.Bf5+– Ke8 37.Rh8 Ng8 38.Be6 Re6 39.Qe6 Qf4 40.Ke2 Kd8 41.Rg8 Bf8 42.Qb6 Kd7 43.Qc6 Kd8 44.Qa8 Kd7 45.Rf8 Qg5 46.Qc8 Kd6 47.Qc6 Ke7 48.Re8 Kf7 49.Qe6 1–0. NN – ChessMaster2000, 1994.

3.c4 Nf6

4.Bb2 d6 5.Nc3 Nbd7 6.Nf3 e4 7.Nd4 Nc5 8.Nb3 a4 (8...Ne6 9.a4=) 9.Nc5 dc5 10.a3 Bd6 11.Qc2 (11.g3 Be5=) 11...0–0 (11...Bf5!?=) 12.Ne4+= Ne4 13.Qe4 Re8 14.Qf3 Qe7 15.Rc1 Be5 16.Be5 Qe5 17.Qe3 (17.Qg3 Qd4+=) 17...Qe3= 18.fe3 (18.fe3 Re4 19.Kf2+–) 1–0. vladimirmk (2345) – antinephilehi (2100), gameknot.com, 2018.

4.e3 d6 (4...d5 5.cd5 Nd5 6.Ba3=+) 5.Nc3 (5.d4 e4=+) 5...Be7 6.Nf3 (6.d4 0–0=+) 6...0–0 7.Be2 (7.d3 Bg4=+) 7...Nbd7 (7...e4!? 8.Nd4 c5 9.bc6 Nc6=+) 8.d4= ed4 9.ed4 (9.Qd4 Nc5 10.0–0=) 9...b6 (9...d5!?=) 10.0–0+= Bb7 11.d5 Nc5 12.Nd4 (12.Re1 Re8+=) 12...Qd7 13.Qc2 (13.Nc6 Rfe8+=) 13...Rfe8 14.Bf3 (14.Re1 a4+=) 14...Ng4 15.h3 (15.Ne4 Ne5 16.Re1 Ncd3=) 15...Ne5 16.Be2 Bf6 17.Be3 Ng6 (17...a4 18.Rfe1=) 18.Bg4 Qe7 19.Bf5 Bg5 (19...a4 20.Rfe1=) 20.Rae1 Be3 21.fe3 Qg5 22.Bg6 hg6 23.Rf3 Nd7 24.Nc6 Qh4 25.Ref1 Nf6 26.Rf4 Qg5 27.Qd3 Bc8 28.e4+/– Qh6 29.Nd4 Bd7 30.a3 Re5 31.Nc6 g5 32.Ne5 gf4+= 33.Nf3 Re8 34.Nh2 Nh5 35.Ne2 g5 36.Qf3 Qg6 37.Nc3 Ng3 38.Re1 f5=+ 39.e5 de5 40.d6? Qd6–+ 41.Qd5 Qd5 42.Nd5 Kf7 43.Nf3 e4 44.Ng5=+ Kg6 45.h4 Nh5 46.Nh3 Kf7 47.Nhf4 Nf4=+ 48.Nf4 Be6 49.Rc1 Rd8 50.c5=+ Bb3 51.cb6 cb6 52.Rc3 a4 53.Kf2 Rd2 54.Ke3 Ra2 55.h5 Kg7 56.Kd4 Rc2+= 57.Rc6 Rd2? 58.Ke3 Ra2= 59.h6 Kg8 60.Rc7 Ra3?? 61.h7+– (61...Kf8 62.h8Q Bg8 63.Kd4 Rd3 64.Nd3 ed3 65.Qf6 Ke8 66.Qe7#) 1–0. Bulcourf,Carlos (2210) – Tanner,Pedro (2305), Buenos Aires ITT, 1992.

3.e3 d5

4.Bb2 Bd6 5.c4 Nf6 6.Nf3 Nbd7 7.Nc3 c6 8.bc6 bc6 9.cd5 Nd5 (9...Rb8 10.Rb1 cd5 11.Nb5=) 10.Nd5 (10.Ne4 Qc7+=) 10...cd5 11.Bb5 (11.Qb3 Rb8 12.Qd5 Qe7=) 11...Rb8 (11...e4 12.Nd4 0–0 13.0–0=) 12.Bd7 (12.Be5 Be5 13.Bd7 Bd7 14.Ne5 0–0+=) 12...Bd7 13.Be5 Be5 14.Ne5 0–0 15.Nd7 Qd7 16.d4 (16.Rb1 Qf5 17.0–0 g6+=) 16...Qb5= 17.a4 Qb4 18.Qd2 Qd2 19.Kd2 Rb2 20.Kd3 Rfb8 21.Rac1 Rf2 22.g3 f5 (22...Ra2 23.Rb1 Ra3 24.Kd2=) 23.Rc3 (23.Rb1 Rb4=) 23...Rbb2 (23...Ra2 24.Rhc1=+) 24.Rhc1?? (better 24.Rc5=) 24…Rbd2 (24...Rfd2) 0–1. dbinc007 – fablulu, gameknot.com, 2019.

4.Bb2 Bd6 5.Nf3 Qe7 6.d4 e4 7.Nfd2 Nf6 8.c4 Ng4 9.Be2 (worse is 9.cd5 Ne3 10.Qb3 Nf1 11.Rf1 Bd7–/+) 9...Qh4 10.Bg4 Bg4 (worse is 10...Qg4 11.Qg4 Bg4 12.cd5+/–) 11.Qc2 0–0 12.c5 (better is 12.Nc3!? c6 13.cd5 cd5 14.Nd5+/–) 12...Be7+= (12...Bh2? 13.Nf1+–) 13.Nc3 c6 14.b6 f5 15.Nf1 Na6 16.Ba3 Bf6 17.Ne2 g5 18.g3 Qh3 19.Rg1 Qh5 20.Rd1 Kh8 21.Rd2 Bh3 22.Rd1 Bf1 23.Rf1 Qh2 24.Kd2 Qh5 25.Rh1 Qf3 26.Rh2 Bg7 27.Rdh1 h6 28.Kc1 Nb4 29.Bb4 ab4 30.Kb1 Ra3 31.Nc1 f4 32.gf4 gf4 33.Rh3 Qg2 34.R3h2 Qg5 35.Rh5 Qf6 36.Qd2 fe3 37.fe3 Qf2 38.Qf2 Rf2 39.R5h3 Rc3 40.Rg3 (40.Nb3 Rcc2 41.Nc1 Rc5–+) 40...Rf3 41.Rhg1 (41.Rf3 ef3 42.Re1–+) 41...Rg3 42.Rg3 Bd4! 43.Rg6 (43.ed4 Rg3 Pinning (43...Rg3 Deflection)) 43...Be3 (43...Bc5!? 44.Re6–+) 44.Nb3 Bc5 45.Nc5 Rc5 46.Rh6 Kg7 47.Rd6 e3 48.Re6 d4 49.Kb2 Kf7 50.Re4 Rd5 51.Kb3 d3 (51...d3 52.Re3 d2 53.Rf3 Ke6–+) 0–1. Franke,Roland (2050) – Doberitz,Paul (2030), Oberliga Ost–A, 2008.

4.Bb2 Nd7 5.Nf3 Bd6 6.Be2 a4 7.a3 Ngf6 8.0–0 0–0 9.d3 Qe7 10.Nbd2 e4 11.de4 de4 12.Nd4 Qe5 13.g3 Nb6 14.c4 Bh3 15.Re1 Bc5 16.Bf1 Bf1 17.Rf1 Rad8 18.Qc2 Qh5 19.Kg2 Rfe8 20.Rad1 Bd4 (20...Nbd7!?–/+) 21.Bd4= Rd4 22.ed4 e3 23.fe3 Ng4 24.Rde1 Qh2 25.Kf3 h5 26.Re2 Qh3 27.e4 Re6 28.e5 Nh2 29.Rh2 Qh2 30.Rf2 Qh3 31.Qe4 Rg6 The isolani on g3 becomes a target 32.Qh4 (32.Qb7 Rg3 (32...Qg3?! 33.Ke2 Qg4 34.Kd3=) 33.Ke2 Re3 34.Kd1 Qg4 35.Rf3 Nc4–+) 32...Qh4 33.gh4 Rg4 34.d5 Rh4 35.e6 fe6 (35...Nc4? 36.Nc4 fe6 37.de6 Rc4 38.Ke3 Rc3 39.Kd4+–) 36.de6 Nc8 (36...Rg4!?–/+) 37.Ne4= Rh3 38.Ke2 c6 (38...Ra3? 39.Rf7 Ra2 40.Kd3 Ra3 41.Kd4+–) 39.Rf7 Rh4 (worse is 39...Ra3 40.Rb7 cb5 41.Rb8 Ra2 42.Kd3+–) 40.Nd2 Nd6 41.Rd7 Nc4?? (better is 41...Nf5=) 42.Rd8+– Kh7 43.e7 Nd2 44.Kd2 (44.Kd2 Re4 45.e8Q Re8 46.Re8 cb5 47.Re5+–) 1–0. phildo (1835) – jarrettmp (1830), gameknot.com, 2013.

3.e3 d6

4.c4 Nf6 5.Nc3 Be7 6.Qc2 0–0 7.Be2 (7.Nf3 Be6+=) 7...Nbd7 (7...d5 8.cd5 Nd5 9.Nf3+=) 8.Nf3+= Ng4 (8...g6!?+=) 9.h3+– Nh6 10.d4 f5 11.Nd5 e4 12.Nd2 Bg5 13.Bb2 c6 14.Nc3 f4 (14...Nb6!?+=) 15.ef4+– Rf4 (15...Bf4 16.Nde4 Nf5 17.Rd1+–) 16.Nce4 (16.Nde4 Nb6 17.bc6 bc6+–) 16...Nb6 (16...Be7 17.0–0+–) 17.c5 dc5 18.dc5 Nd5 19.0–0 Kh8 (19...Be6 20.Rae1+–) 20.Nf3 Bf5 21.Nfg5 Qg5 22.Ng5 Bc2 23.bc6 bc6 24.Rac1 Ba4 25.Bc4 Nf6 (25...Rf5 26.Ne6 Rf7 27.Bd5 cd5 28.c6+–) 26.Ne6 (better 26.Rfe1!? Rf5 27.Ne6 Rh5+–) 26...Rc4 27.Bf6 Rc1 28.Bg7 Kg8 29.Rc1 (29.Bh6? Rf1 30.Kf1 Bb5 31.Kg1 Re8–+) 29...Kf7 (29...Re8 30.Nc7 Re7 31.Bh6 Rc7 32.Rc4+–) 30.Re1 (30.Bh6?! Ke6 31.Rc4 Bb5+–) 30...Nf5 31.Bc3 Ra7 (31...h6 32.Nf4 Rd8 33.Re4 Rd1 34.Kh2+–) 32.g4 Ne7 33.Ng5 Kg8 34.Ba5! Ra5 (34...h6 35.Bb6 Ra6 36.Re7 hg5 37.Bd8+–) 35.Re7 Bc2 (35...h6 36.Ne6 Bc2 37.Rg7 Kh8 38.f4 Ra2 39.f5+–) 36.Rc7 h6 (36...Ra6 37.f3+–) 37.Rc8 Kg7 38.Ne6 Kf6 39.Rc6 Be4 40.Rd6 Ra2 41.f4 Ke7 (41...Kf7 42.Nd8 Kg7 43.c6 Rg2 44.Kf1+–) 42.Nd4 Ra4 (42...Ra1 43.Kf2 Ra2 44.Ke3 Bg2+–) 43.Re6 (43.Re6 Kd8 44.Re4 Ra1 45.Kf2 Ra2 46.Kf3 Ra3 47.Re3+–) 1–0. Silent Move (2115) – serigado (1855), redhotpawn.com, 2012.

4.d4 Nd7 5.Nf3 (5.Bc4 Ngf6=) 5...g6 (5...e4 6.Nfd2 Ngf6 7.Bc4=+) 6.c4 (6.e4 ed4 7.Nd4 Bg7=) 6...Bg7 (6...e4 7.Nfd2 Qe7 8.Bb2=) 7.Nc3 Ne7 8.Be2 0–0 9.0–0 h6 10.Ba3 (10.Ne4 f5 11.Nc3 e4=) 10...f5 (10...ed4 11.ed4 Re8 12.Re1+=) 11.Rc1 f4 12.ef4 Rf4 13.b6 (13.de5!? Ne5 14.c5+=) 13...Nb6 (13...ed4 14.bc7 Qc7+/–) 14.de5+= Nc4 (better is 14...Qe8 15.c5 dc5+=) 15.g3 (15.Nd5 Rf3 16.Ne7 Qe7 17.Bc4 Rf7 18.ed6 cd6 19.Bd6 Qd7+–) 15...Rg4 (15...Bh3 16.Re1 Rg4+=) 16.h3+= Na3 17.hg4 Be6 18.Qa4 b5 (18...Nc6+–) 19.Qa3+/– b4 20.Qa4 (20.Qb2 bc3 21.Qc3 de5 22.Ne5 Ba2 23.Bc4 Bc4 24.Qc4 Kh7+/–) 20...bc3+= 21.Rc3 de5 22.Rd1 Qe8 (22...Nd5 23.Rc5 Qd6 24.Qb5+/– (24.Ra5?! Ra5 25.Qa5 e4+=)) 23.Qe8+/– Re8 24.Bc4 Bc4 25.Rc4 c6 26.Rd7 (26.Re1 e4 27.Rce4 Kf7+/–) 26...Kf8 (26...Kh7 27.Ra4+/–) 27.Nd2 (27.Ra7 e4 28.Re4 Bc3+/–) 27...Rb8+= 28.Nb3 Rb4 (28...Ke8!? 29.Ra7 e4+/–) 29.Na5+– (29...Rc4 30.Nc4+–) 1–0. Bulcourf,Carlos (2205) – Fraschini,Mariano (2350), Buenos Aires Konex, 1991.

3.a4 d5

4.Ba3 Bd6 (4...Ba3 5.Ra3 Nf6 6.Nf3=+) 5.Bd6 (5.e3 Nf6=+) 5...Qd6 6.e3 Nf6 7.f3 (7.Be2 0–0=+) 7...0–0–/+ 8.c4 (8.Ne2 Be6–/+) 8...Be6 (8...d4 9.Qc2–/+) 9.Na3 (9.cd5 Nd5 10.Nc3 Rd8–/+) 9...Nbd7 (9...d4 10.ed4 Qd4 11.Nc2 Qh4 12.g3–/+) 10.d3 (10.cd5 Bd5 11.Nc4 Bc4 12.Bc4 Nb6–/+) 10...Rfe8 (10...Qb4 11.Kf2–+) 11.g3 (11.cd5 Nd5 12.Kf2 N5b6–/+) 11...Nf8 (11...Qb4 12.Kf2–+) 12.Bh3 (12.cd5 Bd5 13.Nc4 Bc4 14.dc4 Qc5–/+) 12...Ng6 (12...Qb4 13.Kf1–/+) 13.Qe2 (13.Be6 Re6 14.cd5 Nd5=+) 13...Rad8 (13...Qb4 14.Qd2 Bh3 15.Nh3 Qa4 16.cd5 Nd5 17.Nf2–+) 14.Qc2 (14.Be6!? Re6 15.cd5 Qb4 16.Qd2 Rd5 17.Nc2–/+) 14...Qb4–+ 15.Kf2 (15.Kf1 dc4 16.Nc4 Rd3 17.Be6 Rc3–+) 15...dc4 (15...e4 16.Be6 ed3 17.Bf7 Kf7 18.Qd3–/+) 16.Be6 (16.Nc4 e4 17.Be6 ed3 18.Bf7 Kf7 19.Qa2–/+) 16...Re6 (better 16...cd3 17.Bf7 Kf7 18.Qa2 Kf8–+) 17.Nc4=+ Ne8 (17...e4 18.fe4 Ne4 19.de4 Ne5 20.Ne5 Rd2 21.Qd2 Qd2 22.Ne2 Qc2+–) 18.Qd2?? (better 18.Ne2=) 18...Qc4!!–+ 19.Ra3 (19.dc4 A pinning theme 19...Rd2) 19...Red6 20.Qc3 Qc3 21.Rc3 Rd3 22.Rc4 (22.Rd3 Rd3 23.Ne2 Ra3–+) 22...Rd1 23.e4 (23.Kg2–+) 23...R8d2 24.Ke3 Rg2 (24...f5 25.Nh3 f4 26.gf4 Nf4 27.Nf4 ef4 28.Kf4 Rh1 29.e5–+) 25.f4 (25.Rc5 Re1 26.Kd3 Rgg1 27.Rg1 Rg1–+) 25...Rgg1 (better 25...ef4!? 26.Kf3 Ra2 27.Rc3 Rf1 28.Kg4 Nf6 29.Kh3 Ne4 30.Rc4 fg3 31.hg3 Ng5 32.Kg4–+) 26.Rg1 Rg1 27.Kf2 (27.f5 Ne7–+) 27…Rb1 (27...Rb1 28.f5 Ne7–+; 27...Ra1 28.f5 Nf8 29.h3–+) 0–1. Herzog – Kuhlmann, 1971.

4.Bb2 b6 5.Be5+= Nf6 6.Nf3 Bd6 7.Bb2 0–0 8.e3 Re8 9.d4 c5 10.c3 (10.dc5 bc5 11.Be2 Be6+–) 10...c4 11.Nbd2 Bg4 12.Be2 Ne4 (12...Qe7 13.h3 Bf5 14.0–0+=) 13.0–0 Nd7 14.Re1 (14.Ne4!? Re4 15.Nd2 Be2 16.Qe2+=) 14...Ndf6= 15.Qc2 Bc7 16.Ba3 Nd2 17.Nd2 Be2 18.Re2 Ne4 19.Nf3 Re6 20.Ree1 Rg6 21.Ne5 Qg5?? (better 21...Be5 22.de5 f6=) 22.Ng6+– fg6 23.Rac1 (23.f3!? Nf6+–) 23...Qh4 24.g3 Qh3 25.Qe2 Ng5 (25...Re8 26.f3 Ng5 27.Rf1+–) 26.Red1 (26.Be7 Ne4+–) 26...h5 27.Be7 Ne6 (27...Nf7 28.Qf3 Qe6 29.Ba3+–) 28.Qf3 (better 28.e4 Re8 29.ed5+–) 28...g5?? (28...Qf5 29.Qf5 gf5+–) 29.Qd5 Kf7 (29...Re8 30.Bg5 Qg4 31.f4+–) 30.Bg5 (30.Qa8 Ke7 31.Qc8 Bd6 32.Qb7 Nc7+–) 30...Rd8 (30...Rf8 31.Qc4 Qg4 32.f4+–) 31.Qf3 Kg6 32.d5 (better 32.Bd8 Nd8 33.d5+–) 32...Ng5 33.Qg2 Qg4 34.f4 Nf3? (34...Nh3 35.Kh1 Bd6+–) 35.Kf2 Ne5 36.fe5 Rf8 37.Kg1 Bd8 (37...Be5 38.d6+–) 38.e6 (better 38.Rd4!? Qg5 39.Qe4 Qf5 40.Rc4 Qe4 41.Re4 Bg5+–) 38...Bg5 39.Re1 h4 (39...Rf3 40.d6 Re3 41.e7+–) 40.gh4 Bh4 (40...Qg2 41.Kg2 Bh4+–) 41.Qg4 Kh7 (41...Bg5 42.h4 Kh7 43.hg5 Kg6 44.e4 Rf3 45.Qf3 Kg5 46.Qf5 Kh6 47.Re2 g6 48.Rh2 Kg7 49.Qf7) 42.Qh4 Kg8 (42...Kg6 43.Rc2 Kf5 44.e4 Ke5 45.Qg3 Rf4 46.Qg7 Kd6 47.e5 Kd5 48.Qd7 Kc5 49.Qd6) 43.e7 (43.Rf1 Re8 44.Rf7 Rc8 45.Qd4 Rd8 46.Qg7) 43...Rf7 (43...Re8 44.d6 Rc8 45.d7 g6 46.dc8Q Kf7 47.e8Q Kg7 48.Qg8) 44.e8Q Rf8 45.Qhe7 (45.Qe6 Rf7 46.Rf1 Kf8 47.Qf7) 45...g5 (45...Re8 46.Qe8 Kh7 47.Qh5 Kg8 48.Rf1 g5 49.Qg6 Kh8 50.Rf8) 46.Q7f8 (46.Q7f8 Kh7 47.Qef7; 46.Q8f8) 1–0. alessandrocarvalhaes (1885) – GranFaraonI (1820), lichess.org, 2019.

4.Nc3 Nf6 5.Bb2 Bd6 6.Nf3 e4 (6...0–0 7.e3=+) 7.Nd4 Be5 8.e3 0–0 9.Nce2 (9.Be2 c5 10.bc6 bc6=+) 9...Nbd7 10.g3 Nb6 11.Bg2 Nc4 12.Bc1 (12.Bc3 Bd7=+) 12...Bg4 13.d3 Bd4 14.ed4 ed3 15.cd3 Nd6 (15...Be2 16.Qe2 Re8 17.Be3 Ne3 18.fe3–/+) 16.0–0=+ c6 17.f3 Bd7 18.Bf4 Qe7 (18...Nf5 19.bc6 Bc6 20.Bh3=+) 19.b6 (19.bc6!? Bc6 20.Re1=) 19...Ra6–/+ 20.Rb1 Re8 21.Nc3 (21.Re1 Bf5=+) 21...Nf5–/+ 22.Be5 (better is 22.Qd2!?–/+) 22...Ne3–+ 23.Qd2 Nf1 24.Kf1 Bf5 25.Nd1 (25.g4 Bg6–+) 25...Bg6 (25...Nd7!? 26.Ne3 Bg6 27.f4–+) 26.Nf2 Nd7 27.Bc7 Qe3 (better is 27...Nf8–+) 28.Re1?? (better is 28.Qe3 Re3 29.Bh3–+) 28...Qd2 29.Re8 Nf8 (30.Bd6 h6 31.Rf8 Kh7–+). NN – SuperConstellation4, 1987.

4.d4 e4 5.e3 Nf6 6.h3 Nbd7 7.Nd2 Bb4 8.c3 (8.Ba3!?=+) 8...Bc3–/+ 9.Rb1 0–0 10.Ba3 Re8 11.Qc2 (11.Ne2 Bd2 12.Qd2 Nb6–/+) 11...Bd2 12.Qd2 Nb6 13.Qc2 Nbd7 (better 13...Be6!?–/+) 14.Rc1 (14.Qd2 Re6–/+) 14...b6 (better 14...c6!?=+) 15.Qc7+= Qc7 16.Rc7 Re6 17.Rc3 Ne8 (17...Bb7 18.g4 Ne8 19.g5+–) 18.Ne2 Rh6 (18...Bb7 19.Nf4 Rh6 20.Be7+–) 19.Nf4 (19.Rc6 Bb7 20.Rh6 gh6+–) 19...Ndf6 (better 19...Bb7+–) 20.Be2?? (better 20.Rc6 Rb8 21.g4 Bg4 22.Nd5 Nd5 23.Rh6 gh6 24.hg4+–) 20...g5–/+ 21.g4 Bd7 (21...gf4 22.g5 Rh3 23.Rh3 Bh3 24.ef4 Be6 25.gf6 Nf6=+) 22.Kf1?? (22.Nh5 Nh5 23.gh5 f6+=) 22...Rc8 (better 22...gf4 23.ef4 Rh4–/+) 23.Rc8= Bc8 24.Kg2 (better 24.Nh5=) 24...Nd7?? (better 24...gf4 25.ef4 Rg6–/+) 25.Nd5+– Re6 (25...Kh8 26.Ne7 Bb7 27.Nf5+–) 26.Rc1 Bb7 27.Nc3 (better 27.Nc7+–) 27...Kg7 28.Nb1 (28.d5 Re5 29.Rd1 Nef6+–) 28...Bd5 29.Bc4 (29.h4 gh4 30.Nc3 Bb3+–) 29...Nef6 30.Bd5 Nd5 31.Nc3 N5f6 (31...Nc3 32.Rc3 Nf6 33.Rc8+–) 32.Ne2 (32.f3 h5+–) 32...h5 (32...Nd5+–) 33.f3 (better 33.gh5!? Nh5 34.d5+–) 33...ef3 34.Kf3 h4? (34...hg4 35.hg4 Ng4 36.e4+–) 35.Rc4 (35.Nc3!? Ne8+–) 35...Ne4 36.Rc2 (36.Bc1 Nd6 37.Rc6 Rf6 38.Kg2 Ne4+–) 36...Ndf6 37.Bb2 (37.Nc3 Nc3 38.Rc3 Nd5+–) 37...Kg6? (better 37...Nd5!?+=) 38.Nc3+– Ng3 39.Ne2?? (39.e4 Nge4 40.d5 Re8 41.Ne4 Ne4 42.Rc6 Kh7+–) 39...Nf1?? Attacks the backward pawn on e3 (39...Nge4 40.Nc1+–) 40.Rc3?? (better 40.Bc1 Nh2 41.Kg2 Nhg4 42.hg4 Ng4 43.Rc6+–) 40...Nd5 Increases the pressure on the backward pawn 41.Rc6 Nfe3 (41...Nd2 42.Kg2 Ne3 43.Kf2=) 42.Re6 (42.Nc3 Nc3 43.Bc3 Nd5=) 42...fe6= 43.Nc3 Nc4 44.Nd5 ed5 45.Bc3 Kf6 46.Ke2 Ke6 47.Kd3 Kf6 48.Ke2 Ke6 ½–½. lindsey000 – forego2231, gameknot.com, 2018.

4.e3 Bd6 5.c4 Nf6 6.cd5 Nd5 7.Bc4 Nb4 8.Nc3 Qf6 9.e4 Nd7 10.Nf3 h6 (10...Nb6 11.Be2=+) 11.0–0 Nb6 12.Be2 0–0 (12...Bg4 13.Ne1 Be6 14.Bg4=+) 13.d3 (13.d4 ed4 14.Qd4 Qg6=+) 13...Be6 14.d4 (14.d4 ed4 15.Qd4=+; 14.Be3 Rad8=+). marekt (2230) – antinephilehi (2105), gameknot.com, 2018.

4.e3 Nf6 5.Bb2 Bd6 6.Nf3 Qe7 7.c4 Nbd7 8.cd5 Nd5 9.Nc3 Nb4 (9...Nc3 10.Bc3 0–0 11.d4=+) 10.Be2 (10.Ne4 0–0=) 10...0–0 (10...e4 11.Nd4 Nc5 12.0–0=+) 11.0–0 (11.Ne4 Nf6 12.Nd6 cd6=) 11...Nf6 (11...e4 12.Nd4 Nc5 13.Ba3=+) 12.Qb3 (12.d4 e4 13.Nd2 Rd8=) 12...Be6=+ 13.Bc4 Nd3 (13...Bc4!? 14.Qc4 e4=+) 14.Be6= Nb2 (14...Qe6!? 15.Qe6 fe6=) 15.Bf7 (15.Qb2?! Qe6 16.d3 Rac8=) 15...Qf7 (15...Rf7 A pinning theme 16.Qb2) 16.Qb2 Bb4? (16...e4 17.Ng5 Qh5 18.f4 ef3 19.Nf3=) 17.d4 (better 17.Ne5!? Qe6 18.d4+–) 17...ed4+– 18.Nd4 Qc4 (18...Rae8 19.Rac1+–) 19.Rac1 Qd3 (19...Qf7 20.Qa2+–) 20.Nce2 (better 20.Qa2 Kh8 21.Nd5+–) 20...Ne4? (better 20...Bd6+–) 21.Rc7 Nf2 (21...Rac8 22.Rb7 Nd2+–) 22.Nf5!! Bc3 (22...Qf5 23.Qg7 A classical mating theme) 23.Qc3 (23.Qc3 Qc3 24.Ne7 Kh8 25.Nc3+–) 1–0. RichardSommer (2100) – meter (2105), lichess.org, 2020.

4.Bb2 Bd6

5.e3 Qe7 6.d3 Nf6 7.Nf3 0–0 8.Be2 c5 9.bc6 Nc6 10.0–0 h6 11.Nbd2 Bf5 (11...Qc7 12.e4+=) 12.c4= Nb4 13.cd5 (13.d4!? e4 14.Ne5=) 13...Nd3+= (13...Nfd5? 14.e4 Be6 15.ed5 Bd5 16.Nc4 Bc4 17.dc4+–; 13...Bd3?! 14.Bd3 Nd3 15.Qb3 Nb2 16.e4 Na4 17.Qa4+=) 14.Bd3 (14.Qb3!? Nb2 15.Qb2–/+) 14...Bd3–/+ 15.Re1 Rac8 (15...Nd5!? 16.Qb3 Nb4–/+) 16.Qb3 (16.e4 Bc2 17.Qe2 Rfd8=) 16...e4 17.Nd4 (17.Bf6 Qf6 (worse is 17...gf6 18.Nd4+=) 18.Nd4 Bb4–/+) 17...Bb4 (17...Qe5 18.N4f3 Qh5 19.Bf6 gf6 20.g3–+) 18.Red1 Qd7 19.Ba3 Nd5 20.Bb4 Nb4 21.Rac1 Kh7 22.h3 g6 23.Rc3 Rc3 24.Qc3 Rc8 25.Qb3 Kg7 26.Nf1 Qd5 27.Qd5 Nd5 28.Ng3 Nb4 29.Rd2 Rc1–+ 30.Kh2 f5 31.f3 Nc2 32.fe4–/+ fe4 33.Ne6 Kf6 34.Nf4 Ne3 35.Nd3 ed3 36.Rd3 Nf5 37.Nf5 gf5 38.Rd6 Kg5 39.Rb6 Rc7 40.Rb5–/+ Kf4 41.Ra5= h5 42.Rb5 h4 43.Rb4 Kg5 44.Kg1 Rd7 45.Rb2 Kf4 46.Kf2 Rd4 0–1. exp2005 (1625) – ambra777, kurnik, 2012.

5.e3 Nf6 6.Nf3 Qe7 7.c4 c6 (7...e4 8.Nd4=+) 8.Be2 (8.d4 e4 9.Nfd2 dc4=) 8...0–0 (8...e4 9.Nd4=+) 9.0–0 (9.d4 e4 10.Ne5 dc4=) 9...Nbd7 (9...e4 10.Ne1–/+) 10.h3 (10.cd5 Nd5 11.d3 Rd8=) 10...Nc5 (10...e4 11.Ne1 cb5 12.cb5 Rd8=+) 11.d4 ed4 12.Nd4?? (12.ed4 Nce4=) 12...Bd7?? (12...Qe5 13.g3 Bh3 14.Re1–+) 13.Bf3 (13.Nc3!?=) 13...dc4 (13...Qe5 14.g3 Bh3 15.Re1–+) 14.bc6 (14.Nd2 Nd3 15.Nc6 bc6 16.Bf6 Qf6 (worse 16...gf6 17.Nc4 cb5 18.ab5+=) 17.Nc4 cb5 18.Nd6 Qd6=+) 14...bc6 (14...Qe5!? 15.g3 Bh3–/+) 15.Nc6 Bc6 16.Bc6 White fights for the Initiative 16...Rac8 17.Bb5 Qe6 (17...Nce4 18.Bd4=+) 18.Bc3?? (better 18.Nd2!?+=) 18...Nb3 (18...Nfe4!?–/+) 19.Ra2=+ Bb4 (19...Rfd8 20.Qe1=) 20.Qe2 Attacking the isolated pawn on c4 (20.Bf6 Qf6 (20...gf6? 21.Bd7 Qe4 22.Bc8 Rc8 23.Rc2+–) 21.Bc4 Rc4 22.Qb3 Rfc8=) 20...Rfd8 (20...Nd5 21.Rc2 Bc3 22.Bc4= (22.Rc3? Nc3 23.Nc3 Rfd8–+)) 21.Bf6= Qf6 (21...gf6 22.Rc2 c3 23.Bd3=) 22.Bc4+= Bd6?? (22...Nc5 23.Qg4=) 23.Rc2 (better 23.Bb3 Qe5 24.g3+–) 23...Nc5+– 24.Nc3 Qe5 Threatening mate... how? 25.g3 h5 (25...Qf5 26.Kh2+=) 26.Nb5 Bb8 (26...Qf5 27.Rfc1 h4 28.g4+–) 27.f4 (27.Qf3!? Rd7 28.Be2+–) 27...Qf5+– 28.Rfc1 Qh3 (28...Na4 29.Kh2 h4 30.gh4=+) 29.Qg2+– Qg2 (better 29...Qd7!? 30.Qf3 Na4 31.Qh5 Nb6+=) 30.Kg2+– Ne6 31.Be6 (31.Nd4 Kh8 32.Be6 Rc2 33.Rc2 fe6+–) 31...Rc2 32.Rc2 fe6 33.Nd4 e5 34.Ne6 (better 34.Nc6!? Re8 35.Na5 ef4 36.gf4+–) 34...Re8+= 35.Ng5 ef4 36.gf4 h4 (36...Bd6!?+=) 37.Kf3+– Bd6 38.Rh2 (38.Kg4 Re3 39.Rc8 Bf8+–) 38...Bf8 (38...Bc5!? 39.e4 Rb8+–) 39.Rh4+– Rd8 (39...Be7 40.Rg4+–) 40.Rh2 (40.Ne6 Rb8 41.Nf8 Rf8+–) 40...Rc8 41.Rd2 Rc4? (better 41...Be7+–) 42.Rd5 Ra4 43.Rd8 Rb4 44.Ne6 Kf7 45.Nf8 (45.Rf8?! Ke6 46.Ra8 a4+=) 45...Kf6 (45...a4 46.Ra8+–) 46.Nh7 Kf7 (46...Ke7 47.Rg8+–) 47.Ng5 Kg6 (47...Kg6 48.Rd6 Kh5+–; 47...Ke7 48.Ra8+–). RichardSommer (2040) – Sasayego (1970), lichess.org, 2020.

5.Nf3 Nd7 6.Ba3 =+.

5.g3 f5 6.Bg2 (6.f4 Nd7–/+) 6...Nf6 7.e3 (7.Nc3 e4=+) 7...0–0 8.Nf3 Nbd7 9.Ng5 (9.0–0!?=+) 9...Nb6–/+ 10.d3 d4 (better 10...Ng4 11.Nf3 Bb4 12.c3 Bd6–/+) 11.0–0? (better 11.ed4 Ng4 12.de5 Ne5 13.Qh5=) 11...h6?? (better 11...de3 12.Nh3 Nbd5–+) 12.Nh3?? (better 12.ed4 ed4 13.Nf3+=) 12...de3–/+ 13.fe3 Nbd5 (13...Nfd5!? 14.Re1 f4 15.ef4 ef4 16.Nf4 Nf4 17.gf4 Rf4–/+) 14.Qe2=+ Be6 15.Nd2 Qd7 (15...Ng4 16.Bd5 Bd5 17.Nf2 Nf2 18.Rf2=+) 16.c4= Nb4 17.Rad1 (17.d4 ed4 18.Bd4 c5=) 17...f4=+ 18.Nf2 Nc2 (better 18...Ng4!? 19.ef4 ef4 20.gf4 Bf4 21.Ng4 Bg4–/+) 19.ef4+= ef4 20.Nde4 (20.Bb7 Rab8 21.Bc6 Qe7+=) 20...Ne3 (20...Ne4 21.Be4 Ne3 22.Bb7 Nd1 23.Qd1–/+) 21.Nd6 (better 21.Nf6!? gf6 22.Bb7+=) 21...cd6=+ (worse 21...Nf1 22.Nb7 Ng3 23.hg3 fg3 24.Ne4+–) 22.gf4 Nd1 23.Qd1 Rae8 24.Ne4 (24.Bd4 Bf5=+) 24...Ne4 25.de4 Bc4 26.Rf2 White intends f5 (26.Rf3 d5 27.Bh3 Qc7–/+) 26...Qe6 (26...Rf7 27.Qd4 Qc7 28.Ba3–/+) 27.f5 Qe7 28.Qg4 Attacking the backward pawn on g7 (28.Qd4 Rc8=) 28...Rf7 (28...Qg5 29.Qg5 hg5 30.e5=+) 29.h4 (29.e5!? Rc8 30.Be4=) 29...Bd3 Exerts pressure on the backward pawn (29...Bb3 30.Bf3=+) 30.f6 Qe6 31.Qg3? (better 31.Qe6 Re6 32.e5 de5 33.Bd5 Ref6 34.Bf7 Rf7 35.Rf7 Kf7 36.Be5=) 31...Be4–+ 32.Re2 (32.Bf1 Qd5–+) 32...d5 (32...Qc4 33.Qe1 d5 34.fg7 Qa4 35.b6–+) 33.Kh2 1–0. bolu – blackfox, net–chess.com, 2019.

5.g3 Nf6 6.Nf3 e4 7.Nd4=+.

4.Bb2 Nd7

5.Nf3 Bd6 =+.

5.Nf3 e4 6.Nd4 Ne5 7.Nb3 (7.b6 cb6 8.Na3 Nf6=+) 7...Bd6 8.e3 Bg4 9.Be2 Be2 10.Qe2 Qg5 11.f4 ef3 12.gf3 Nf6 (12...Nc4 13.Bd4 0–0–0 14.d3+=) 13.Qf2 (13.f4 Qh4 14.Qf2 Qf2 15.Kf2 Neg4 16.Kf3 Kd7=) 13...Qh5 14.Nd4 0–0 (14...Bc5 15.Rf1–/+) 15.Nc3 (15.Ba3 Ba3 16.Na3 Rae8=+) 15...c5 16.bc6 bc6 17.Nce2 Nc4 18.Bc3 c5 19.Nb5 Be5 20.Ng3 Qh3 21.0–0–0 (21.Be5 Ne5 22.e4 Rab8=+) 21...Bc3–/+ 22.Nc3 Rab8 23.Nb5 (23.Rdg1 Rb4–/+) 23...Qd7 24.Rdg1 Rb5 (24...Nb6 25.Qg2 Na4=+) 25.ab5= Qb5 26.Nf5 Rb8 27.Kd1 Qb1 28.Ke2 Qc2 29.Kf1 (29.Rg7 Kf8 30.Rd1 Qf5 31.Rg2–+) 29...Qf5 30.Qg3 (30.Ke2 Rb2 31.Rd1–+) 30...Qd3 (< 30...Nd2 31.Ke2 Qf3 32.Qf3 Nf3 33.Kf3–+) 31.Kg2 Ne3! (31...Qd2?! 32.Kh3 Ne8 33.Qb8 Qe3 34.Qg3–+) 32.de3 Rb2 33.Qf2 Rf2 34.Kf2 Nh5 35.Kg2 (35.Re1 a4–+) 35...Qe3 (better is 35...Qe2 36.Kh3 Qf3 37.Kh4–+) 36.Kh3 (36.Re1 Nf4 37.Kg3 Ne2 38.Kg2–+) 36…Qf4 (37.Rf1 Qg5–+; better is 36...Qf3 37.Kh4 h6 38.Rg7 Ng7 39.Rg1–+) 0–1. Marshall,Ian – Roelens,Rene, corr FRA–SCO team, 1991.

5.g3 Ngf6–/+ 6.Bh3 Bd6 7.e3 (7.Nf3 e4 8.Nd4 Ne5=+) 7...Nb6 8.Bg2 (8.Bc8 Rc8 9.f4 Nc4–/+) 8...Nc4 9.Bc1 (9.Ba3 Na3 10.Na3 0–0–/+) 9...Bg4 10.Ne2 0–0 11.h3 Be6 12.d3 Nb6 13.c3 Qd7 14.Bb2 (14.Ba3 Rad8–/+) 14...Rad8 15.Nd2 Bf5 (15...c6 16.Nb3–/+) 16.Qb1 (16.Nb3 Ra8–/+) 16...h6 (16...c6 17.bc6 Qc6 18.g4–/+) 17.g4 Bg6 18.Nf3 (18.Ba3 Rfe8–/+) 18...Nc4 19.Bc1 e4–+ 20.de4 Be4 21.Qb3 Rfe8 22.0–0 Bd3 23.Nfd4 Be4 24.Qd1?? Bg2 25.Kg2 c5 26.Nf5 b6 27.Qd3–/+ Ne5 28.Qd2 Nc4 29.Qc2 Be5 30.f4 Bd6 31.Qd3 Qe6 32.Rf3 Ne4 33.Neg3 Bb8 34.Rb1 Qf6 35.Bb2 Ncd2?? 36.Rbf1?? Nf1 37.Nf1 h5 38.N5g3 hg4 39.hg4 Qh4 40.g5 c4 41.Qd4 Bc7 42.Nf5 Qh7 43.N1g3 Nc5 44.Qd1 Nd3 45.Ba3 Rd7 46.Rf1 Nc5?? 47.Rh1 Qg6= 48.Qg4?? Qe6?? 49.Bc1 Na4 50.Qh5 Qh6 51.gh6 g6 52.Qg5 Bd8 53.h7 Kh8 54.Qh6 gf5 55.Nf5 f6 56.Nh4 Rg7 57.Ng6 Rg6 58.Qg6 Rf8 59.Kf3 f5 60.Rg1 Bg5 61.Rg5 Nc3 62.Qg8! Rg8 63.hg8Q (63.Rg8?! Kh7 64.Rb8 Nb5 65.Rb6 Nc3+–) 1–0. NN – ChessMaster2000, 1994.

3.Bb2 Bc5

4.e3 d6 (--> 1.b4 e5 2.b5 Bc5 3.Bb2 d6 4.e3 a5).

4.Be5 Nf6 5.d4 Bb6 6.Bf6 Qf6 7.Nf3 c5 (7...d5!?+=) 8.Nc3+/– cd4 9.Nd5 Qd6 10.Nb6 Qb6 11.Qd4 Qh6? (better is 11...Qd4 12.Nd4 d5+–) 12.Qc5 d6 (12...Kd8 13.Rd1 Qf6+–) 13.Qc8 Ke7 14.Qh8 Qf6 15.0–0–0 (better is 15.Rd1!? Qc3 16.Nd2 d5+–) 15...Qa1 16.Kd2 Qa2 17.Qg7 Qd5 18.Nd4 Na6 (18...Qe5 19.Qe5 de5 20.Nf5 Kf6+–) 19.e4 Qe4 1–0. preparation – PolandOVII, Live Game Caissa's Web, 2004.

4.Be5 Bf2

5.Kf2 Nf6

6.c4 Ng4 7.Ke1 Ne5 8.Nf3 Ng4 (8...Nf3 9.ef3 0–0 10.d4=+) 9.h3 Nf6 10.e3 d5 11.Nc3 dc4 (11...Be6 12.cd5 Nd5 13.Qc2=+) 12.Bc4= 0–0 13.Qb3 (better is 13.Kf2=) 13...Be6 (13...Qd6 14.d3=+) 14.d4 (14.Be6 a4 15.Qc4 fe6 16.Ng5+–) 14...Bc4 15.Qc4 b6 (15...Nbd7 16.Kf2=+) 16.Ke2 (16.Kf2 Qe7+=) 16...c6= 17.Ne5 cb5 18.Nb5 (18.Qb5!? Na6 19.Kf3=+) 18...Ne4–/+ 19.Nc6? (19.Rhc1 Qh4 20.Qc2 Na6–/+) 19...Ng3?? (better is 19...Qf6 20.Ne5 Ng3 21.Kd2 Qf2 22.Kc3 Nh1 23.Rh1 Na6–+) 20.Kf2?? (better is 20.Kf3 Qh4 21.Ne7 Qe7 22.Kg3 Qe3 23.Kh2 Qf4 24.Kg1–/+) 20...Ne4 (better is 20...Nh1 21.Kg1 Nc6 22.Kh1 Rc8–+) 21.Ke2 Ng3?? (21...Qf6 22.Rhc1 Qf2 23.Kd3 Nc6 24.Qc6 Qd2 25.Ke4 Rfe8 26.Kf4 Qe3 27.Kg4 Re4 28.Qe4 Qe4 29.Kg3 Qd3 30.Kh2 Qb5 31.Rab1–+) 22.Kd3?? (22.Kf2 Nh1 23.Kg1 Nc6 24.Qc6–+) 22...Nc6–+ 23.Qc6 Rc8 24.Qf3 Qh4 (better is 24...Nh1 25.Rh1 Qe7–+) 25.Rhc1 (25.Rhb1 f5 26.Qf4 Qf4 27.ef4 Ne4=) 25...Rcd8 (25...Qg5 26.a4 Qg6 27.e4–/+) 26.Rc7 (26.a4 Rfe8 27.Qf4 Qf4 28.ef4 Ne2–/+) 26...Nh5 (26...Qg5 27.a4 Rde8 28.Rac1–/+) 27.g4 (better is 27.Qg4 Qg4 28.hg4+=) 27...Nf6–/+ 28.Na7 (better is 28.Nc3!?–/+) 28...Nd5–+ 29.Rb7 Nb4 30.Ke2 Rfe8?? (better is 30...Rde8 31.Rd1 Re6–+) 31.a3 Nd5?? (better is 31...Re7 32.ab4 Rb7 33.Qb7 Qh3 34.ba5 ba5+–) 32.Qf7 Kh8 33.Qg7 1–0. Scirocco – PolandOVIII, Live Game Caissa's Web, 2004.

6.Bd4 Ne4 7.Ke1 Qh4 8.g3 Ng3 +–.

6.Nf3 Ng4 7.Ke1 Ne5 8.Ne5 Qh4 9.g3 Qd4 10.Nf7 0–0 +/–.

6.Nf3 Ng4 7.Ke1 f6?? 8.h3 (8.Bf4 d6+–) 8...Nh6?? (better is 8...Ne5 9.e4 d6=) 9.Bg3 0–0 10.e3 Nf5 11.Bh2 d5 12.c4 c6 (12...Be6 13.Qc2 Nd6 14.Nd4+–) 13.Nc3 (13.cd5 cd5 14.Nc3 d4 15.Bc4 Kh8+–) 13...cb5 (13...d4 14.ed4 Nd4 15.Kf2+–) 14.cd5 (14.Nd5 bc4 15.Bc4 Kh8+–) 14...b4 15.Nb5 Bd7 (15...Na6 16.Bc4+–) 16.Nc7 Ra7 17.Ne6 (17.e4 Qe7 18.Qe2 Nd6+–) 17...Be6 18.de6 Nc6 19.Qb3 Kh8 (19...Nfe7 20.Bc4+–) 20.e7 (better is 20.Qd3 Nfe7 21.Qd8 Rd8+–) 20...Nce7 (20...Nfe7 21.Bc4+–) 21.Kf2 Nd5 (21...Nd6+–) 22.e4 a4 (22...Qb6 23.Ke1 Nd4 24.Qd3+–) 23.Qb2 (better is 23.Qd5 Qd5 24.ed5+–) 23...Qb6 24.d4 a3 25.Qd2 Nc3 26.ef5?? (better is 26.Re1 Nd4 27.Qd4 Qd4 28.Nd4 Na2 29.Bd6+–) 26...Rd8?? (26...Ne4 27.Ke3 Nd2 28.Kd2–/+) 27.Rb1 (better is 27.Bd3+–) 27...Nb1?? (27...Ne4 28.Ke1 Nd2 29.Kd2 Rd4 30.Bd3 Rd7–+) 28.Qd3 Nc3 29.g4 (29.Qc4 Ne4 30.Kg1 Nd6 31.Bd6 Qd6+=) 29...Nd5 (29...Rc8 30.Qc2 b3 31.ab3 a2–+) 30.Bg2+/– b3 31.ab3 Nb4 32.Qe3 (better is 32.Qc4 Nc6 33.Re1+/–) 32...a2 33.Ra1 (33.Qe6 Qe6 34.fe6 a1Q 35.Ra1 Ra1–+) 33...Nc2–+ 34.Rf1?? (34.Qc1 Na1 35.Qa1 Qb3 36.Nd2–+) 34...Ne3 35.Ke3 Qb3 36.Kf4 a1Q 37.Ra1 Ra1 38.Kg3 Qc2 39.h4 Qe2 40.g5 Qe7 (41.Kh3 Ra3–+; better is 40...Ra2 41.Bh1 Qf2 42.Kg4 Rd4 43.Nd4 Qd4 44.Bf4–+) 0–1. SlavisaCCCC – PolandOVII, Live Game Caissa's Web, 2004.

6.Nf3 Ng4 7.Kg1 Ne5 8.Ne5 +–.

3.Bb2 c6

4.e3 d6 5.c4 Nf6 (--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5 5.c4 c6).

4.e4 Bd6 (4...Nf6 5.Be5 Ne4 6.Qe2+=) 5.d4 ed4 6.Qd4 Bf8 7.b6 (7.Nc3 Qe7+–) 7...Qe7 (7...d6 8.Nd2=) 8.Nf3 (8.Nc3 Qb4 9.0–0–0 d6+=) 8...d5= 9.e5 (9.Bd3 de4 10.Qe4 Qe4 11.Be4 Nd7=) 9...Nd7 10.Be2 (10.Ba3 Qd8=+) 10...Qb4=+ 11.Nbd2 Qd4 (11...Nb6 12.a3 Qd4 13.Bd4=+) 12.Bd4 Bb4 (12...c5 13.Be3=+) 13.c3 (better 13.e6 Ndf6 14.ef7 Kf7 15.Ne5 Ke6 16.Nd3+=) 13...Bc5?? (13...Bf8 14.Rb1+=) 14.Bc5?? (better 14.e6 Ngf6 15.ed7 Nd7 16.Rb1+–) 14...Nc5+= 15.0–0 (15.c4 Ne7+=) 15...f6 (15...Na4 16.Rfc1=) 16.Rfe1 Bg4 17.ef6 (17.c4!?+=) 17...Nf6= 18.Nd4 0–0 19.Bg4 Ng4 20.h3 (better 20.f3!? Nf6 21.N2b3=) 20...Nf2–/+ (worse 20...Rf2 21.N2b3 Na4 22.hg4+–) 21.Re7 Rab8 (21...Nfd3 22.N2b3–/+) 22.N2f3? (22.N2b3!? Nfe4 23.Nc5 Nc5 24.Nb3=+) 22...Nfd3 23.Rd1 Rbe8 24.Rc7 Nb2 25.Rd2 (better 25.Re1!? Re1 26.Ne1–+) 25...Nc4–+ 26.Re2 Nb6 (26...Re2!? 27.Ne2 Nb6 28.Re7–+) 27.Re8 Re8 28.Nf5 Nbd7 29.Nd6 Re6?? (better 29...Rb8 30.Nd4 a4–+) 30.Nb7+= Nb7 31.Rb7 (31.Rd7 Nc5 32.Rd8 Kf7 33.Ng5 Ke7 34.Ne6 Ke6 (worse 34...Ne6 35.Ra8+–) 35.Re8 Kd6+=) 31...Re7 32.Nd4 c5 33.Nf5 Rf7 34.Nd6 Re7 35.Nc8 Re1 (35...Rf7 36.Ra7=) 36.Kf2+= Re8 37.Rd7 (37.Rd7 Rc8 38.Rd5+=) 1–0. Adjailton (1855) – viesturssk (1660), lichess.org, 2016.

4.Be5+/– Bc5?? 5.d4 (better 5.Bg7 Bd4 6.Bd4 Nf6+–) 5...f6?? (5...Bf8 6.e3+–) 6.dc5 (better 6.Bb8 Bb4 7.c3 Rb8 8.cb4 ab4 9.Qa4+–) 6...fe5+– 7.e3 Qe7 8.Qh5 (better 8.Qd6!? cb5 9.Nf3+–) 8...g6= 9.Qf3 (9.Qg4 Qc5 10.Nd2 cb5=) 9...Qc5 10.c3 (10.c4!?=) 10...cb5=+ 11.Nh3 b4 12.Ng5 Nh6 (12...Qe7 13.Qg3=+) 13.c4 (13.Ne4 Qf8 14.Qd1 Nf5+=) 13...Nc6 (13...Nf5 14.Qd5 Qd5 15.cd5=+) 14.Be2 (14.Nd2 Qf8=) 14...Rf8 (14...Nd4 15.Qe4 Ne2 16.Ke2–/+) 15.Qe4 (15.Qh3 Nf5 16.Qh7 Nce7+=) 15...d5 (better 15...Qe7 16.Nf3 d6=+) 16.cd5?? (better 16.Qd5 Qe7 17.Ne4+=) 16...Qc1–+ 17.Bd1 Rf2?? (17...Bf5 18.Qh4 Bb1–/+) 18.Kf2 (better 18.dc6 Rf5 19.Nh7+–) 18...Ng4?? (18...Bf5 19.Be2 Qh1+–) 19.Bg4+– Qh1 (19...Qb2 20.Kg3 Ne7+–) 20.dc6 Bg4 21.Qg4 Kf8 (21...Qg2 22.Kg2 bc6 23.Qe6 Kd8 24.Qf7 Kc8 25.Ne6 Ra7 26.Qa7 b3 27.Qc7) 22.Qd7 Kg8 (22...Qg2 23.Kg2 Kg8 24.Qh7 Kf8 25.Qf7) 23.Qf7 Kh8 1–0. e4_e5_f4 (1730) – JFrnka (1690), lichess.org, 2021.

4.Be5+/– d6 5.Bd4 Nf6 6.e3 Be7 7.Nf3 0–0 8.Bd3 Bg4 9.h3 Bd7 10.0–0 (10.c4 d5 11.cd5 Nd5+=) 10...cb5+= 11.Na3 (11.a3 Na6+=) 11...b4= 12.Nb5 Nc6 13.Qe2 Nd4 14.Nfd4 Nd5? (better is 14...d5=) 15.Bh7+/– Kh8 (15...Kh7!? 16.Qh5 Kg8 17.Qd5 Qb6+/–) 16.Be4+– Ne3?? (better is 16...Nf6 17.Bb7 Rb8+–) 17.Qh5 Kg8 18.Qh7# 1–0. marre – oppo, internet, 2010.

4.bc6 Nc6

5.Be5?? Ne5–+ 6.d4 Nc6 7.g3 (7.e3 d5–+) 7...d5 8.Bg2 Be6 9.Nf3 Nf6 10.e3 Bb4 11.Nbd2 (11.c3 Bd6–+) 11...0–0 12.0–0 Qd7 13.Nb3 Bh3 14.c3 (14.Bh3 Qh3 15.Qd3 Qh5–+) 14...Bd6 (14...Bg2 15.Kg2 Bc3 16.Nc5–+) 15.Qd3 Bg2 16.Kg2 Qg4 17.c4 h5 (17...Nb4!? 18.Qe2–+) 18.cd5 Nd5 19.Nbd2 f5 (19...Ncb4 20.Qb3 a4 21.Qa3–+) 20.Nc4 Bc7 21.a3 f4 (better 21...b5 22.Ncd2 b4–+) 22.ef4?? (better 22.h3 Qd7 23.e4–/+) 22...Nf4–+ 23.Kg1 Qh3 (23...Nd3 24.Nfe5 Nce5 25.de5 Qc4 26.f3–+) 24.Nh4?? (better 24.gf4 Rf4 25.Qh7 Kh7 26.Ng5 Kh6 27.Nh3 Rg4 28.Kh1–+) 24...Nd3 25.Rfd1 Nf2 (25...Rf2 26.Rd3 Qh2) 26.Rd2 (26.Nf5 Rf5 27.Rd3 Nd3 28.Re1 Ne1 29.Ne3 Rf1 30.Nf1 Qg2) 26...Bg3! 27.hg3 (27.hg3 Qh1 Mate attack) 27...Qg3 (27...Qh1) 28.Ng2 (28.Kf1 Ne4 29.Nf5 Rf5 30.Ke2 Nc3) 28...h4 (28...Ng4 29.Rf2 Rf2 30.Na5 Qg2) 29.Nce3 h3 30.Raa2 (30.Rd3 Ng4 31.Ng4 Qg2) 30...h2 31.Kf1 Ne4 (31...h1Q 32.Ke2 Qf3) 32.Ke2 Nd2 (32...h1Q 33.Ra1 Qhg2 34.Kd3 Qd2 35.Kc4 Nd6 36.Kd5 Qe5) 33.Ra1 (33.Kd1 h1Q 34.Kd2 Rf2 35.Kd3 Qd1 36.Kc4 Qd4 37.Kb5 Qge5 38.Nd5 Qed5) 33...Rf2 34.Kd3 Rg2 (34...Qg6 35.Kc3 Ne4 36.Kc4 Ne5 37.de5 Qc6 38.Kd4 Rd2) 35.d5 (35.Rc1 Qg6 36.Kc3 Ne4 37.Kc4 Ne5 38.Kd5 Rd8 39.Ke5 Qf6 40.Ke4 Rd4) 35...Ne5 36.Kd4 Nb3 37.Ke4 Re2 38.Rh1 (38.Rf1 Qe3 39.Kf5 Nd4) 38...Re3 39.Kf5 Rf8 (39...Nd4) 40.Ke6 Qg6 41.Ke7 Qf6 (41...Re8) 0–1. alessandrocarvalhaes (1840) – coas (1825), lichess.org, 2019.

5.g3 d5 6.Bg2 Nf6 7.Nf3 Bc5 8.Ne5 Ne5 9.Be5 0–0 (better is 9...Bf2!? 10.Kf2 Ng4 11.Kg1 Ne5+=) 10.0–0 Qe7 11.Bf4 (11.d4 Rd8+/–) 11...Ng4? (11...Bg4 12.Bf3 Bf3 13.ef3=) 12.e3 (12.d4 Bd6 13.Nc3 Be6 14.Bd6 Qd6+/–) 12...Qf6? (better is 12...g5 13.Bf3 Nh6=) 13.Nc3+– g5 14.Nd5 Qh6 15.h3 gf4 16.hg4 Be6 17.Nf4 Kh8 18.Bb7 Rab8 19.Bf3 Rg8 20.Ne6 fe6 21.d4 Bd6 22.Qd3 Qh3 23.Qe4 Rg6 24.c4 Rh6 25.Rfc1 Bg3 26.fg3 Qg3?? 27.Kf1 Rh2 28.Qe5 Kg8 29.Qg3 (29.Qg3 Rbb2 30.c5 Rhf2 31.Kg1+–; 29.Qe6 Kg7 30.Qe7 Kg8 31.Bd5 Kh8 32.Qf6#) 1–0. wk1234 – szuetam13, kurnik, 2012.

3.Bb2 d5

4.e3 Bd6= 5.c4 c6 (5...Nf6 6.d4 e4 7.Nc3=) 6.a4 (6.cd5 cd5 7.d4 e4=) 6...Nf6 7.Nf3 (7.d4 dc4 8.Bc4 e4=+) 7...Nbd7 8.Be2 Qe7 (8...e4 9.Nd4=+) 9.d4 e4 (9...dc4 10.0–0=+) 10.Nfd2= 0–0 11.Nc3 Re8 12.bc6 bc6 13.cd5 cd5 14.0–0 Nf8 (14...Ba6 15.Nb5=+) 15.Re1 Ng6 16.Nf1 Nh4 (16...Rb8 17.Nb5=+) 17.Ng3 (17.Nb5 Bb4 18.Ba3 Ba3 19.Ra3 Bf5=) 17...g6 (17...Rb8 18.Nb5=) 18.Qb3 (18.Nb5 Bb4 19.Ba3 Ba3 20.Ra3 Nf5+=) 18...Be6 19.Nb5 Rab8 20.Ba3 Ba3 21.Qa3 Qd7 (21...Qa3 22.Ra3 Rec8 23.Rb1=) 22.Qd6 (22.Qc3 Qd8+=) 22...Qd6= 23.Nd6 Red8 24.Nb5 Nf5 25.Rac1 (25.Nf5 Bf5 26.Rec1 Be6+=) 25...Ng3= 26.hg3 Rdc8 27.Red1 Bd7 (27...Kg7 28.Kf1=) 28.Kf1 Ne8 29.Ke1 Bb5 30.Bb5 Nd6 (30...Kf8!?+=) 31.Bc6+– Rb4 32.Bd5 Rc1 33.Rc1 Ra4 34.Rc6 Nf5 35.Be4 Ne7 36.Rc7 Ra2?? (better 36...Kf8+–) 37.Re7 (37.Re7 Ra1 38.Ke2+–) 1–0. BeepBeepImAJeep (2670) – tenemeelnene (2265), lichess.org, 2017.

4.Be5 d4 5.Nf3 c5 6.bc6 (6.e3 de3 7.fe3 Nf6+–) 6...Nc6 7.e3 Bg4 (7...de3 8.fe3 Ne5 9.Ne5 Qh4 10.g3+–) 8.Bb5 Bb4?? (better 8...de3 9.fe3 Nf6+–) 9.Bg7+– (9.ed4?! Nf6+–) 9...Ke7 (9...de3 10.fe3 Qb6 11.Bc6 Qc6 12.Bh8+–) 10.Bc6 (10.Bh8 de3 11.fe3 Qb6 12.Bc6 Qc6+–) 10...bc6 11.Bd4 (better 11.Bh8 de3 12.fe3+–) 11...f6 12.c4 (12.h3 Bh5+–) 12...c5 13.Bc3 (13.Bb2 a4+–) 13...Ke6 (13...Qd3 14.Qe2 Rd8 15.Qd3 Rd3 16.Ke2+–) 14.d4 (14.a3 Bc3 15.Nc3 Qd3+–) 14...Bc3 (14...Kf7 15.d5+–) 15.Nc3 Bf3 16.Qf3 (worse 16.gf3 cd4 17.ed4 Ne7+–) 16...Qd6 (16...cd4 17.Nb5 Ne7+–) 17.Qa8 Nh6 (17...cd4 18.Nd5 Kf7 19.Rb1+–) 18.Qe4 (better 18.Qh8 cd4 19.Nd5 Nf5+–) 18...Kd7 (18...Kf7 19.Rb1 cd4 20.Rb7 Kf8 21.ed4+–) 19.Rb1 f5 20.Rb7 (20.Qb7!? Qc7 21.Qd5 Ke7+–) 20...Kc8 21.Qf3 Nf7 22.Nb5 (22.Rf7 Qa6 23.Qf5 Qe6 24.Qe6 Kb8 25.Qe5 Kc8 26.Qh8) 22...Qc6 23.Qc6 (23.Qc6 Kd8 24.Qd7) 1–0. FeegLood (2500) – mohammadreza_s (2100), lichess.org, 2016.

4.Be5 Bd7 5.a4 Bd6?? (better is 5...Nf6+=) 6.Bg7+– Be5 7.Be5 f6 8.Bd4 Be6 9.Ra3 Qd6 10.e3 Nd7 11.Bd3 h6 12.Nf3 0–0–0 13.Nc3 (better is 13.0–0+–) 13...Qa3+/– 14.e4 de4 15.Be4 Ne7 16.0–0 Rhg8 17.Nb1 Qa4 18.Nc3 Qb4 19.Qa1 Bh3 20.Rb1 Qd6 (20...Rg2?! 21.Kh1 Qd6 22.Qa5=+) 21.Qa5 Rg2 (21...Bg2 22.Qa8 Nb8 23.Qb7 Kd7 24.Bc6 Nbc6 25.bc6 Nc6 26.Nh4–+) 22.Kf1 (22.Kh1!? Nc5 23.b6+=) 22...Nc5 23.b6? (better is 23.Ke1–/+) 23...Ne4 24.Qa8 Kd7 25.Qb7 Rf2 26.Ke1 Rf1 27.Ke2 Nc3 28.dc3 Rb1 29.Nd2 Qe6 30.Ne4 Qg4 31.Kd3 Bf1 32.Ke3 Nf5 33.Kf2 Qg2# 0–1. Wloka,Frank – Tiedemann,Joern (1810), RSL2, 2004.

4.Be5 Nf6 5.e3 Bd6 (5...Nbd7 6.Bf4+=) 6.Bd6+– Qd6 7.Nf3 Bf5 (7...Ne4 8.c4+–) 8.Nd4 Bg6 9.Be2 0–0 10.Nc3 c5 (10...a4 11.0–0+–) 11.bc6! bc6 (11...bc6 12.Nf3 Combination; 11...Nc6 12.Ncb5 Combination) 12.0–0 Nbd7 (12...c5 13.Ndb5 Qe7 14.d4+–) 13.a4 (13.f4 h6+–) 13...Rfe8 (13...Rab8 14.f4 h6 15.Nb3+–) 14.Nf3 (14.f4 h6+–) 14...Nc5 (14...Rab8 15.Nh4+=) 15.Rb1 (15.d4 Nce4 16.Ne4 Be4+–) 15...Nce4 (15...Nfe4!? 16.Ne4 de4=) 16.Ne4+= Ne4 17.Rb3 (17.Nd4 Rab8 18.Rb8 Rb8+–) 17...Nc5 18.Ra3 Re4 (better 18...Ne4 19.Qc1 Bh5+=) 19.Nd4 (better 19.d4 Ne6 20.Ra2+–) 19...Ne6=+ 20.Rd3 Nc5 (better 20...Rh4!? 21.g3 Bd3 22.Bd3 Rd4 23.ed4 Nd4=) 21.Rc3+– Rc8 22.Bf3 (22.Qa1 Ne6 23.Ne6 fe6 24.d4+=) 22...Na4 (22...Re7 23.Bg4 Rcc7 24.Qc1+–) 23.Rb3 (better 23.Be4 de4 24.Rb3+–) 23...Re7= 24.Qa1 Nc5 25.Rc3 Ne4 (25...Nb7 26.Bg4 Rcc7 27.Rb1+–) 26.Be4 Be4 (26...Re4 27.Qa5 c5 28.Ra1+–) 27.Qa5 Re5? (better 27...c5!?+–) 28.f3 (28.Rc6 Rc6 29.Qa8 Qf8 30.Qc6 Re8+–) 28...Bg6 29.Nc6! Ree8 (29...Rc6 30.Qa8 Decoy) 30.Nd4 (30.Qd5 Qd5 31.Ne7 Kf8 32.Nd5 Rc3 33.dc3 Bc2+–) 30...Ra8 (30...Qd7 31.Rc8 Rc8 32.Rb1+–) 31.Qc5 Qe5 (31...Qd8 32.Rb1+–) 32.Rb1 (32.f4 Qe4+–) 32...h5 (32...h6 33.f4 Qe4 34.Rcb3+–) 33.Ne2 (33.f4 Qe4+–) 33...h4 (33...Reb8 34.Rc1+–) 34.Qd4 (34.Nf4 Red8+–) 34...Qg5 (34...Ra2 35.Qh4 Bc2 36.Rc1+–) 35.Nf4 h3 (35...Rec8 36.Qd5 Qd5 37.Rc8 Rc8 38.Nd5 Bc2 39.Rc1+–) 36.Nh3 Qh6 (36...Qf5 37.Rc5+–) 37.Nf4 Bf5 (37...Rab8 38.Rc1+–) 38.Nd5 (38.Qd5 Qf6 39.Rc6 Be6 40.Ne6 fe6+–) 38...Be6 39.e4 (39.Rc7 Qg5 40.c4 Red8+–) 39...Rad8 (39...Bd5 40.ed5 Qg6 41.Qd3+–) 40.Qe3 (40.Rc6 Qg5 41.c4 Bd5 42.cd5 Ra8+–) 40...Qg6 (40...Bd5 41.Qh6 gh6 42.ed5 Rd5+–) 41.Nf4 (41.Rc6 Qh5 42.Nc7 Rb8+–) 41...Qf6 42.Ne6 Qe6 (42...Re6 43.Rcb3+–) 43.Rd3 (43.d4 Rc8+–) 43...Qa6 (43...Qa2 44.Rdb3+–) 44.Rd8 Rd8 45.d3 (45.d4 Rc8+–) 45...Qa2 46.Rc1 Qb2 47.Qd2 (47.f4 Qc3+–) 47...Ra8 (47...Rd3 48.Qd3 Qc1 49.Kf2+–) 48.Kf2 (48.d4 Rc8+–) 48...Ra2 (48...Rd8 49.Qe3+–) 49.Ke2 (49.d4 Ra4 50.Rd1 Rc4+–) 49...Qb6 50.Kd1 (50.Qc3 Ra8+–) 50...Qb2 (50...Qg1 51.Qe1 Qh2 52.Qf2+–) 51.d4 Ra4 52.d5 (better 52.c4 Qb3 53.Ke1+–) 52...Rd4= 53.d6? (better 53.g4=) 53...Rd2–+ 54.Kd2 Qd4 55.Ke2 Qd6 56.Rd1 (56.c4 Qh2 57.Kf2 Qb8–+) 56...Qh6 (56...Qh2 57.Kf2–+) 57.Rd2 (57.h3!? Qg5 58.g4 Qf4–+) 57...Qh2–+ 58.Ke3 Kh7 59.c4 Qh6 60.Kd3 Qa6 61.Rc2 Qa3 62.Kd4 Qd6 63.Kc3 Qg3 (63...Kg6 64.Ra2–+) 64.Kd3 (64.c5 Qc7 65.Kb4 Qb7 66.Ka3 Qc6–+) 64...Qc7 (64...g5 65.Kd4–+) 65.c5 Qd7 (65...Qc6 66.Rc1–+) 66.Kc4 Qc7 (66...Kg6 67.g4–+) 67.Kb4 (67.Kd3 Qc6 68.Kd4–+) 67...Kg6 (better 67...Qb7 68.Ka3 Qc6–+) 68.Kc3? (68.c6 Kf6–/+) 68...Qb7 (better 68...Qc5 69.Kd3 Qd6 70.Ke2 Qa6 71.Ke3 Qb6 72.Ke2 f5–+) 69.Kc4 (better 69.g4–+) 69...Qc7 (69...f5 70.ef5 Kf5 71.Rc3–+) 70.Rd2?? (70.Kc3 Qc5 71.Kd3 Qd6 72.Ke2–+) 70...Kf6 71.Rd6 Ke7 72.Kd5 White prepares the advance c6 (72.g4 Qa5 73.Rd3 Qa4 74.Kd5 Kd7–+) 72...Qa7 (better 72...Qb7 73.Kc4 Qb2–+) 73.c6?? (73.Kc6 Qa2–+) 73...Qa3 (better 73...Qa5 74.Kd4 Kd6–+) 74.Rd7 Ke8 75.Rd6 (75.Rb7 Qd3 76.Kc5 g5–+) 75...Qd3 (better 75...Qc1–+) 76.Ke5? (better 76.Kc5!? Qc2 77.Kb6 Qb2 78.Kc5 Qc3 79.Kb6 Qb4 80.Kc7 Qa5 81.Kc8–+) 76...Qc3 (76...f6 77.Ke6 Qc4 78.Kf5–+) 77.Rd4? (77.Kd5–+) 77...g6 (better 77...Qc6 78.Kf4–+) 78.Kd5 1–0. FeegLood (2745) – Arka50 (2565), lichess.org, 2015.

4.Be5 Bg4 5.a4 Bf5 (5...Nd7 6.Bb2+=) 6.Nf3+– Nf6 7.e3 Nfd7 8.Bb2 c5 9.d3 Bg6 10.Nbd2 h5 (10...f6!?+–) 11.Be2+– Nb6 12.g3 Qe7 13.Nh4 Bh7 14.Bh5 N8d7 15.Qf3 d4 (15...c4 16.Nf5 Bf5 17.Qf5 cd3 18.cd3+–) 16.e4 (16.Qb7!? Rb8 17.Qc6 Rc8+–) 16...g6+– 17.Bg4 Bh6 18.0–0–0?? (better 18.Bd7 Nd7 19.Nc4+–) 18...Ne5 19.Qe2 c4 20.Bd4 cd3 21.cd3 Qa3 22.Bb2?? (22.Kb1 Qb4 23.Nb3 Qb3 24.Qb2 Qb2 25.Kb2 Ng4 A) worse 26.Bh8 0–0–0 27.f3 Nf2–/+ (worse 27...Rh8 28.fg4 Na4 29.Ka3+=); B) 26.Bb6 Bg7 27.Kb3=) 22...Nd3–+ 23.Qd3 Qd3 24.Nhf3 (24.Bh8 f5 25.Bf5 gf5 26.Kb2 Bg8 27.Nc4 Nc4 28.Ka1 Qa3 29.Kb1 Qb3 30.Ka1 Na3 31.Rd8 Rd8 32.Nf5 Nc2) 24...0–0 25.Bd4 (25.Rde1 Nc4 26.Re3 Be3 27.fe3 Ne3 28.Nd4 Rac8 29.Nc4 Rc4 30.Bc3 Rc3 31.Kb2 Nc4 32.Ka1 Ra3) 25...Na4 (25...Rfc8 26.Bc8 Rc8 27.Kb2 Rc2 28.Kb1 Rd2 29.Ka1 Qa3 30.Kb1 Qb3 31.Ka1 Qa2) 26.e5 (26.Bh8 Rfc8! 27.Bc8 Rc8 28.Bc3 Rc3) 26…Rac8! (26...Rac8 27.Bc8 Rc8 28.Bc5 Rc5) 0–1. alessandrocarvalhaes (1835) – lichess AI level 5, lichess.org, 2020.

3.Bb2 d6

4.a3 f5 5.e3 Nf6 6.c4 Be7 7.Nf3 0–0 8.d4 e4 9.Nfd2 Qe8 10.Be2 Qg6 11.g3 h6 12.Nc3 Be6 13.d5 Bf7 14.Nb3 Nbd7 15.Nd4 Ne5 16.Na4 Nfg4 17.Bg4 (better is 17.Rb1=) 17…Nd3 (17...Nd3 18.Qd3 ed3 19.Bf5 Qf6=; 17...Qg4?! 18.Qg4 fg4 19.Nf5+=; 17...Ng4?! 18.Nb3+=) 0–1. vihavald (1640) – inznorek (1780), kurnik, 2012.

4.a4 a5 5.e3 Qf6 6.Nf3 Be7 7.c4 Qg6 8.Nc3 c6 9.Qb3 h5 (9...Nf6 10.d4 e4 11.Nd2=) 10.Nd1 (10.d4 e4 11.Nd2 Nf6+=) 10...h4= 11.h3 f5 (better 11...Nf6=) 12.Bd3?? (better 12.Rb1=) 12...e4–+ (12...Qg2?! 13.Rh2 Qg6 14.Bf1–/+) 13.Be4?? (13.Rg1–+) 13...fe4 14.Nd4 (14.Nh4 Rh4 15.Rh2 Nf6 16.bc6 Nc6–+) 14...c5 (14...Qg2 15.d3 Qh1 16.Kd2 Qh3 17.bc6 bc6 18.de4–+) 15.Nc2 (15.Ne2 Qg2 16.Rg1 Qh3 17.Rg7–+) 15...Qg2 16.Rf1 (16.d3 Qh1 17.Kd2 Nf6–+) 16…Bh3 (16...Bh3 17.d3 Qf1 18.Kd2 Bg4 19.Bg7 Rh7 20.de4 Qe2 21.Kc3 Rg7–+) 0–1. AhmedSultanov – ahmet27x, lichess.org, 2019.

4.a4 Be6 5.e3 Be7 6.Qf3 Nf6=+ 7.Qb7?? (7.Nc3 c6=+) 7...Nbd7 (7...Bd5 8.Qa8 Ba8 9.Na3–+) 8.Nf3?? (better 8.Nc3=) 8...0–0 (8...Bd5 9.Qa8 Qa8 10.Be2–+) 9.c4?? (better 9.Qc6 Nc5 10.b6 cb6 11.Qb5–+) 9...Nc5–+ 10.Qc6 Bd7 11.Qa8 (11.Ne5 Bc6 (11...de5?! 12.Qf3–+) 12.Nc6 Qd7–+) 11...Qa8 12.Be2 c6 (12...Bg4!? 13.h3 Bh5 14.d3–+) 13.0–0 cb5 (13...e4 14.Nd4–+) 14.ab5 Nb3 (14...e4 15.Nd4–+) 15.Ra2 (15.Ra3 a4 16.Nc3 e4 17.Ra4 Qb7–+) 15...d5 (better 15...e4 16.Nd4 Nd4 17.Bd4 Rc8–+) 16.Ne5 Bd6 (16...Rc8!? 17.Ba3 Ba3 18.Ra3 dc4 19.Nc4 Bb5 20.Nb6 Be2 21.Na8 Bf1 22.Kf1 Rc1 23.Ke2 Rb1 24.Kd3 Nc1 25.Kc2–+) 17.Nd7–/+ Nd7 18.Rd1 (18.d4!?–/+) 18...dc4 (18...Rc8 19.d3–+) 19.Bc4 Nbc5 20.d4 Ne6 21.Bd3 Qb8 22.Ra5 (22.h3 Qb6–+) 22...Bh2 23.Kh1 (23.Kf1 Bd6–+) 23...Bc7 (23...Qd8!? 24.Kh2 Qa5 25.Nc3–+) 24.Ra6 Nb6 25.Nc3 Ng5 (25...Qd8 26.g3–+) 26.Ba3–/+ Re8 27.Bc5 Ne6 (27...Qd8 28.Kg1–+) 28.Ne4 (28.Be4 Qd8 (worse 28...Nc5 29.dc5 Nc4 30.Bd5+=) 29.g3 Qf6 (29...Nc5?! 30.dc5 Qc8 31.cb6 Bg3 32.fg3 Qc3 33.Ra8 Ra8 34.Ba8+=) 30.Bb6 Qf2 31.Bc7 Nc7–+) 28...Nc5 (28...Rd8!?–+) 29.Nc5? (better 29.dc5!? Nd7 30.b6=+) 29…Nd5 (29...Nd5 30.Rb1 Qd8–+) 0–1. AleksandrNekhoroshik – Didew, lichess.org, 2021.

4.a4 Nf6 (--> 1.b4 e5 2.Bb2 d6 3.b5 Nf6 4.a4 a5).

4.a4 g6 5.e3 Bg7 6.Nf3 Ne7 7.Be2 0–0 8.0–0 e4 9.Bg7 (9.Nd4!?=) 9...ef3–/+ (9...Kg7?! 10.Nd4=) 10.Bf8 fe2 11.Qe2 Qf8 12.c4 (12.Nc3 Nd7–/+) 12...b6 13.Qf3 Ra7 14.d4 Bb7 15.Qg3 (15.e4 f5–/+) 15...Nd7 16.Nc3 f5 (16...Nf6 17.f3–/+) 17.Ne2 Ra8 18.Nf4 Qf6 19.h4 h5 (better 19...Nf8–/+) 20.Nh5+= Qf7 21.Nf4 Kh7 (21...Kg7 22.f3=) 22.f3+= Nf6 (22...Qc4 23.Rfc1 Qb3 24.Rc7+–) 23.Nh3 Kg7 (23...Kg8 24.Ng5 Qg7 25.Ne6+=) 24.Ng5+– Qg8 (24...Qc4? 25.Rac1 Qd5 26.Rc7+–) 25.d5 Bc8 26.e4 Nh5 27.Qf2 Qf8 (27...f4!?+–) 28.ef5+– gf5 29.g4! Nf4?? (29...fg4 30.Ne6 Double attack (30.fg4 Passed pawn)) 30.Qd4 (30.Qd4 Qf6 31.Qf4+–) 1–0. DEFFM – Guestxxx, freechess.org, 2019.

4.Nc3 f5 5.d4 Be7 6.e4 Nf6 7.de5 de5 8.Qd8 Bd8 9.Nf3 fe4 10.Ne5 0–0?? (better is 10...Nbd7 11.f4 Be7=) 11.Bc4+– Kh8 12.Ba3 Re8?? (12...Nbd7 13.Nd7 Nd7 14.Bf8 Bf6+–) 13.Nf7 Kg8 14.Nd8 Kh8 15.Nf7 (15.Nf7 Kg8 16.Nd6 Kh8 17.Ne8 Ne8 18.0–0–0+–) 1–0. asoka (2500) – kode (2100), net–chess.com, 2011.

4.d4 Qf6 5.de5 de5 6.Nf3 Nd7 7.e3 Bd6 8.Nbd2 Qe7 9.Ne4 f6 10.Nd6 Qd6 11.Qd6 cd6 12.Bc4 Ne7 13.0–0 Nc5 14.Ba3 Ne4 15.Rad1 Kd7 16.Bb2 b6 17.Nd2 Nc5 18.Nb3 Bb7 19.Nc5 bc5 20.a4 1–0. aniabielak – karboleon, kurnik, 2012.

4.e3 Bf5 5.Qf3 g6 (5...Qc8 6.Bd3 Bd3 7.cd3+=) 6.Qb7 (6.Nc3 c6+=) 6...Nd7+= 7.Qc6 (7.Nc3 Nc5 8.Qc6 Bd7+=) 7...Ne7 (7...Bg7 8.Nc3 Ne7 9.Qf3=) 8.Qf3 Bg7 (8...Bc2 9.Na3 Bf5 10.e4+=) 9.e4+= Be6 10.Nh3 h6 (better 10...Bh6!?+=) 11.Nf4!+– 0–0 (11...ef4 12.Bg7 Pinning (12.Bg7 Deflection)) 12.Ne6+– fe6 13.Qh3 Rf6 14.Be2 (14.Ba3 Nc5 15.Nc3 Rb8+–) 14...d5 (14...Nc5 15.Qe3+–) 15.Bg4+– Nf8 (15...Kh7 16.0–0+–) 16.Be5 Rf7 17.Bg7 Kg7 18.Be6 (18.Nc3 Qd6+–) 18...Rf6 19.Bd5 Rb8?? (19...Nd5 20.ed5 Qd5+–) 20.Nc3 Nd5 (20...Nd7 21.Qg3+–) 21.Nd5 (worse 21.ed5 Rf5 22.0–0 Nh7+–) 21...Rd6 (21...Rb5 22.Nf6 Qf6 23.0–0+–) 22.Qc3 Kh7 23.Qa5 (23.Nc7?! Rc8+–) 23...Qg5 (23...Qd7+–) 24.Qc7 (24.Qc7 Rd7 25.Qb8 Qg2 26.0–0–0+–) 1–0. DEFFM – GuestDGLZ, freechess.org, 2019.

4.e3 Nh6 5.Nf3 Bg4 (5...Be7 6.Nc3+=) 6.Be2 Rg8 (better 6...Nd7!?+–) 7.0–0+– Nd7 8.d4 (8.Nc3 Nf6+–) 8...e4+– 9.Nfd2 Be2 (9...f5 10.Nc3+–) 10.Qe2+– d5 11.c4 Nf6 12.cd5 (12.Nc3 Bb4+–) 12...Qd5+– 13.Nc3 Qe6 14.Nc4 Nd5 (14...Bb4!?+–) 15.Nd5+– Qd5 16.Qc2 (16.f3 Bd6+–) 16...f5+– 17.a4 g5 18.Rac1 (18.Rfc1 Ng4+–) 18...Ng4 (18...Rg7!?+–) 19.f3+– ef3 (19...Nf6 20.Qf2+–) 20.Rf3 f4? (20...Qe4+–) 21.Qh7 (21.ef4 Be7 22.Re1 h5+–) 21...Nf6 22.Qc7 Rg7 23.Qb6 Rc8 (23...Be7+–) 24.Nd6! Bd6 (24...Qd6 25.Rc8 Double attack (25.Rc8 Discovered attack); 24...Bd6 25.Rc8 Double attack (25.Rc8 Discovered attack)) 25.Rc8 Kf7 (25...Ke7 26.Rf1 Rg6 27.Bc1+–) 26.Rd8 Ne8 27.ef4 (better 27.Ba3 Bc7 28.Rd5 Bb6 29.ef4 gf4 30.Rf4 Ke6 31.Rh5+–) 27...Kg8 (27...gf4 28.Ba3 Rg6+–) 28.Re8 Kh7 (28...Kf7 29.Qd8 gf4 30.Rf8 Bf8 31.Qd5 Kg6 32.Qe6 Kg5 33.Rg3 fg3 34.Bc1 Kh5 35.Qf5 Rg5 36.Qg5) 29.Rh3 Kg6 30.Re5 Kf7 (30...Qe5 31.de5 gf4 32.ed6 Rh7 33.d7 Kf5 34.Qf6 Kg4 35.Qg6) 31.Rd5 (31.Rd5 Be7 32.Rf5 Ke8 33.Rh8 Rg8 34.Rg8 Bf8 35.Qb7 gf4 36.Rgf8) 1–0. DEFFM – GuestJRGK, freechess.org, 2020.

4.e4 c6 5.Bc4 cb5 (5...Nf6 6.Qe2=) 6.Bb5+= Bd7 7.Bc4 (7.Bd7 Qd7 8.Qe2 Nf6+=) 7...Nf6 8.d3 (better 8.Nc3!?=) 8...b5–/+ 9.Bd5 Nd5 10.ed5 Be7 11.Qf3 0–0 12.Ne2 Qc8 13.c3 f5 14.0–0 e4 (14...g5!?–/+) 15.de4= fe4 16.Qe4 Bf5? (16...Bf6 17.Nd2=) 17.Qd4 (better 17.Qe7!? Re8 18.Qd6 Re2 19.Ba3+=) 17...Bf6= 18.Qb6 (18.Qd2 Nd7=) 18...Nd7 (18...Bd3 19.Qe3 Bc4 20.Qd2=+) 19.Qd6= Nc5 (19...Ne5 20.Nd2=) 20.Nd2 (20.Rd1 Rd8 21.Qg3 Bc2=+) 20...Nd3 Black intends b4 (20...Rd8 21.Qg3 Na4 22.Ba3 Rd5 23.Nb1–/+) 21.Ba3 (better 21.Rab1!?=) 21...b4 22.Bc1 (22.cb4? Ba1 23.Ra1 Qc2–+) 22...bc3 23.Nc3?? (better 23.Nb3–/+) 23...Bc3 (23...Qc3 24.Nb3 a4 25.Rb1 ab3 26.Rb3–+) 24.Ba3 (24.Rb1 Bb4 25.Qc6 Nc1 26.Rbc1 Bd2–+) 24...Ba1 (24...Rf6 25.Qe7 Bd2 26.Rad1–+) 25.Ra1 (25.Qf8 Qf8 26.Bf8–+) 25...Re8 (better 25...Qc3 26.Nb3 Rf6 27.Qe7–+) 26.Nf3 (26.Qc6–+) 26...Qc3 27.Rf1 Rad8 28.Qg3 (28.Qb6 Qa3 29.Nd4 Bc8–+) 28...Qa3 29.Nd4 Qc5 (better 29...Rd5 30.Nf5 Rf5–+) 30.Nf5 Rd7 (better 30...g6 31.Nh6 Kg7 32.Nf5 Kh8–+) 31.Qd3–/+ Rf7 (better 31...Qd5 32.Qb1 Qd3–/+) 32.Ne3+= Qd6 33.Rc1 (33.Qb5 Qf8+=) 33...Ref8= 34.f3 Qa3?? (better 34...Re8 35.Rc6 Qe5=) 35.Qa3+– 1–0. Adjailton (1865) – viesturssk (1650), lichess.org, 2016.

4.e4 Nd7 5.a4 (5.d4 Ngf6=) 5...Ngf6+= 6.Nc3 Nc5 7.d4 (7.f3 Ne6+=) 7...ed4 (7...Nce4 8.de5 Nc3 9.Bc3+=) 8.Qd4= Be7 (8...Nfe4 9.Ne4 Qe7 10.Ra3=) 9.Bc4 (9.Nf3 0–0=) 9...Be6 10.Nge2 Qd7 (10...Bc4 11.Qc4 Nfe4 12.Ne4=) 11.f3 (11.0–0 Bc4 12.Qc4 0–0=) 11...Bc4 (11...0–0 12.0–0=) 12.Qc4 Qe6 (12...0–0 13.0–0=) 13.Qd4 Qe5 14.Qd2 Ne6 (14...0–0 15.0–0=) 15.Nd1 (15.Rb1 Qc5+/–) 15...Qg5 (15...Qc5 16.Ne3+=) 16.Qg5 Ng5 17.Ne3 Ne6 18.Nf5 (18.Rd1 Nd7+=) 18...Nd7 19.Ne7 (19.Ng7 Ng7 20.Bg7 Rg8+=) 19...Ke7 20.Kf2 (20.Ng3 f6+=) 20...Rhc8 (20...Nb6 21.Ng3=) 21.Nd4+= g6 22.Ne6 Ke6 23.Bd4 (23.Rhd1 Re8+=) 23...c6 24.Rhc1 (24.bc6!? Rc6 25.c3+=) 24...cb5+= 25.ab5 Rc4 (25...a4 26.Ra2+=) 26.c3= Rac8 (26...a4 27.Ke3+=) 27.Ke3 (27.Rd1 a4=) 27...b6 28.Ra3 Nc5 29.Rca1 Kd7 30.R1a2 Re8 31.Rb3?? (better is 31.Kf2=). Lihosith,Peter (2095) – Kantorik,Marian (2325), Piestany Slovakia, 2005.

4.e4 g6 5.f4 (5.Nf3 Nf6+=) 5...Bg7 (5...Bh6 6.Ne2=) 6.g3 (6.Nf3 Nf6=) 6...Ne7 7.Nf3 Nd7 8.c4 (8.fe5 0–0=) 8...0–0 9.a4 (9.d4 ef4 10.gf4 Nc5=) 9...Nc5 (9...f5 10.d4 ed4 11.Nd4–+) 10.d3 (10.fe5 de5 11.Ne5 f6=+) 10...Bg4 (10...f5 11.fe5 de5 12.Ne5 fe4 13.Ra3–/+) 11.Nbd2 (11.h3 Bf3 12.Qf3 f5=+) 11...f5 12.ef5? (12.h3 Bf3 13.Qf3 fe4 14.Ne4 ef4 15.Bg7 Kg7 16.Nc5 dc5 17.Qb7–+) 12...Nf5–+ (12...gf5?! 13.h3 Bf3 A) 14.Qf3? e4 15.Ne4 Bb2 16.Nc5 dc5–+ (< 16...Ba1 17.Ne6 Qc8 18.Nf8–+); B) 14.Nf3=+; 12...Rf5?! 13.h3 Bf3 14.Nf3 ef4 15.Bg7 Kg7 16.d4–/+; 12...Bf5?! 13.fe5 Bd3 14.Ra3 Bf1 15.Rf1 de5 16.Qe2=+) 13.Be2 (13.Qb1 ef4 14.Bg7 Qe7 15.Be5 de5–+) 13...Ne3 (13...e4 14.de4 Bb2 15.ef5 Ba1 16.Qa1–+) 14.Qc1 ef4 15.Rg1?? (better is 15.Bg7 Kg7 16.Qc3 Qf6 17.Qf6 Rf6 18.Kf2 Bf3 19.Nf3 Ng4 20.Kg1–+) 15...Bf3 16.Bg7 Be2 (16...Kg7?! 17.Nf3 Nb3 18.Qb2 Qf6 19.Ra2 Qb2 20.Rb2–+) 17.Qc3 (17.Ke2 Kg7 18.gf4–+) 17...Re8 (17...Qe7 18.Ne4 Bd3 19.Bf8 Rf8 20.gf4 Qe4 21.Rg6 hg6 22.Qg7 Kg7 23.Rb1 Nf1 24.Kd1 Qe2 25.Kc1 Qd2) 18.Bd4 (18.Ne4 Bd3 19.Nf6 Kg7 20.Ne8 Kf7 21.Qg7 Ke8 22.Qh7 Qf6–+) 18...Bd3 (18...Nd1 19.Qa3 Nd3 20.Qd3 Bd3 21.Kd1–+) 19.Bc5 (19.Kf2 Ng4 20.Kf3–+) 19…Nd5 (20.Ne4 Nc3–+) 0–1. Reuschel – Flechsig,Wolfgang, corr DDR JB'6452, 1981.

4.Nf3 Be6 5.e4 Be7 6.d4 Nd7 7.d5 Bg4 8.Be2 Bf3 9.Bf3 Nc5 10.0–0 a4 11.a3 Qd7 12.c4 Nb3 13.Ra2 h5 14.Nd2 h4 (14...Nc5!?+/–) 15.Nb3+– ab3 16.Qb3 h3 17.g3 g5 18.Qd1 Nf6 Black intends g4 19.Bc1 g4 20.Bh1 Nh5 21.f4 gf3 22.Qf3 0–0–0 23.a4 Rdg8 24.Qf5 Qf5 25.Rf5 f6 26.a5 Kb8 27.Be3 White plans b6 27...Ng7 28.Rf1 Ne8 29.b6 Rg4 30.bc7 Nc7 31.Bb6 Na6 32.Bf3 Rg7 33.Rc2 Rc8 34.Be2 Bd8 35.g4 Nc5 36.Bf3 Bb6+= 37.ab6 Nd3? 38.Ra1+– Rc5?? 39.Rca2 Kc8 40.Ra8 Kd7 41.R8a7 Ke8 42.Be2 Nf4 43.Bf1 Rd7 44.Ra8+– Rd8 45.Rd8 Kd8 46.Ra7 Kc8 47.Ra8 Kd7 48.Rb8 Ng6 49.Rb7 Kc8 50.Rg7 Nh4 (50...Nh4 51.Kf2 Ng2+–). bratek55 (1635) – dtpwaldi (1625), kurnik, 2011.

4.Nf3 g6 5.e3 Bg7 6.d3 Qe7 7.Be2 d5 (7...Nf6 8.0–0=) 8.Nbd2 Bd7 (8...Nd7 9.0–0=) 9.a4 f6 10.0–0 b6 (10...Qe6 11.e4 Ne7 12.d4+–) 11.Rb1 (11.c4 c6+–) 11...c6 12.c4 cb5 13.cb5 Be6 14.Ra1 (14.Rc1 Qb4 15.Qc2 Ne7+–) 14...Nd7+= 15.Ba3 Qf7 16.Qc2 (16.d4 e4 17.Ne1 Rc8+=) 16...Bf8 (16...Ne7 17.Rac1=) 17.Bb2 (17.Qc6 Rd8+=) 17...Nc5 (17...Ne7!?=) 18.Rfc1 Bd6 (18...Rc8 19.d4 ed4 20.Bd4+–) 19.Qd1 (19.d4!? Bf5 20.Qc3 ed4 21.ed4+– (21.Qd4?! Rd8+–)) 19...Rc8 (19...Nd7 20.Ba3 Ba3 21.Ra3+=) 20.Kf1 (20.d4 ed4 21.Bd4 Nh6+–) 20...Ne7+= 21.Kg1 (21.d4 ed4 22.Nd4 Nf5+=) 21...Nf5 (21...0–0!?=) 22.d4+= Ne4 (22...ed4 23.ed4 Nb7 24.Rc6+=) 23.Nf1 (better 23.Rc8!? Bc8 24.de5 Be5 25.Ne5 fe5 26.Rc1+–) 23...0–0 (23...Ne7 24.de5 fe5 25.Bd3+– (25.Be5 Be5 26.Ne5 Qf2 27.Kh1 Nc3 28.Rc3 Rc3=)) 24.de5+– fe5 25.Bd3 (25.Ne5 Rc1 26.Rc1 Qf6+–) 25...Rfd8?? (25...Nf2 26.Kf2 e4 27.Rc8 Bc8 28.Rc1=+) 26.Rcb1?? (better 26.Ne5!? Qf8 27.Rc8 Rc8 28.Nc6+–) 26...Nc3= 27.Bc3 Rc3 28.Ng5 Qd7 29.Qd2 (29.Rc1 Rc5=) 29...Rc5 (29...Bb4 30.Qd1=+) 30.Qe2 (30.e4 Ne7=) 30...e4 31.Bc2 (better 31.Be4 de4 32.Ne4=+) 31...Qg7?? (better 31...Rdc8 32.Be4 de4 33.Ne4 Be5 34.Nc5 Rc5=+) 32.Ne6+– Qe7 33.Nd8 Qd8 34.Bb3 Qc7 (34...Be5 35.Ra2+–) 35.Rd1 Rc3 (35...Ne7 36.Qg4 Kg7 37.Qe6+–) 36.Bd5 Kg7 37.Qb2 Be5 38.Qd2 (38.Rac1 Rc5 39.Rc5 bc5+– (39...Bb2?? 40.Rc7 Kh6 41.Be4+–)) 38...Rd3 39.Qe2 (better 39.Rac1 Qd6 40.Qa2+–) 39...Bb2?? (39...Ba1 40.Be4 Rd1 41.Qd1 Bf6+–) 40.Rab1 (better 40.Qb2 Qc3 41.Qc3 Rc3 42.Be4 Ne7+–) 40...Rd1 (40...Be5 41.Be4 Rd1 42.Rd1+–) 41.Rd1 (better 41.Qb2 Rd4 42.Ng3 Ng3 43.Qd4 Kh6 44.fg3 Qc2+–) 41...Qc5 (41...Be5+–) 42.Qb2 Kh6 43.Be4 Nd6 44.Qf6 (44.Rd5 Qc7 45.Qe5+–) 44...Nc4 45.Qh4 (45.Qf4 Kg7 46.Rd7 Qe7 47.Re7 Kg8 48.Qb8) 45...Kg7 46.Rd7 (46.Rd7 Qe7 47.Qe7 Kh6 48.Qh4) 1–0. Dino_Jarach (1650) – zjhost, lichess.org, 2017.

4.f4 ef4–/+ 5.Nf3 Nf6 6.c4 (6.Bd4 Be7–/+) 6...Be7 7.g3 Nh5 8.Kf2 Bf6 9.Nd4? (better is 9.Nc3–/+) 9...c5–+ 10.bc6 (10.e3 fg3 11.Kg2–+) 10...Qb6 (10...bc6?! 11.e3 Qb6 12.Bc3–/+; 10...Nc6?! 11.e3 Nd4 12.Bd4 Bd4 13.ed4 fg3 14.hg3 Qf6 15.Kg2 Qd4 16.Nc3–+) 11.Qb3 (11.e3 fe3 12.de3 Qb2 13.Nd2 Nc6–+) 11...Bd4 12.Bd4 Qd4 13.e3 (13.Kg2 Qa1 14.cb7 Bb7 15.Qb7 0–0 (15...Qa2 16.Qe4 Kd7 17.Qb7 Ke8 18.Qe4 Kf8 19.Nc3 Qd2 20.Qa8=) 16.Qa8 Qb1 17.Qa5 Qe4 18.Kg1 Qg6–+) 13...fe3 (13...fg3 14.hg3 Qa1 15.cb7 Bb7 16.Qb7 Qf6 17.Kg2–+) 14.de3 (14.Qe3 Qe3 15.Ke3 Nc6–+) 14...Qf6 15.Kg1 bc6 16.Nc3 Qe5 17.e4 Nd7 18.Kg2 Nhf6 19.Qc2 Ng4 20.Re1 Qd4 21.Nd1 0–0 22.Be2 Nc5 23.h3 Ne5 24.Nf2 Rb8 25.Rd1 Qb2 26.Qb2 Rb2 27.Rhe1 f5 28.Rd6 fe4 29.Kg1 e3 30.Nd1 Rd2 31.Rd2 ed2 32.Rf1 Bh3 33.Rf8 Kf8 34.Kf2 Ne4 35.Ke3 Ng3 36.Kd2 Ne2 37.Ke2 Bg4 (38.Ke1 Bd1 39.Kd1 Nc4–+) 0–1. Urgelles Paumier,A – Diaz Almaguer,B, corr Carlos M de Cespedes, 2004.

4.a4 b6

5.c4 Bb7 6.e3 Nd7 7.Nf3 Ngf6 8.Be2 Be7 9.0–0 Nc5 (9...0–0 10.d4+=) 10.d4+= ed4 11.Nd4 (11.ed4 Nce4+=) 11...0–0 12.Nf5 Nfe4 (12...Be4 13.Ng3=) 13.Bf3 (better 13.Bg7!? Bf6 14.Bf8 Ba1 15.Be7+–) 13...Bf6= 14.Bf6 (14.Nd4 Be5=) 14...Qf6=+ (worse 14...Nf6 15.Bb7 Nb7 16.Qf3+=) 15.Nd4 Rae8 16.Qc2 Ba8 (16...Qg6=+) 17.Nd2 (17.Nc3 Qg5=) 17...Ng5 (better 17...Nd2!? 18.Qd2 Bf3 19.gf3 Ne6–/+) 18.Ba8= Ra8 19.N2f3 h5 (19...Nf3 20.Nf3 Rfe8 21.Rad1=) 20.Rad1 Rae8 21.Nf5 (better 21.Ng5!? Qg5 22.Nb3=) 21...Nf3=+ 22.gf3 g6 (better 22...Na4 23.Nd6 cd6 24.Qa4 Qf3–+) 23.Nh4?? (better 23.Nd4=) 23...Qh4–+ 24.Kh1 (24.Rd4 Qh3 25.Qd1 f5–+) 24...Re5 (better 24...Qh3 25.f4 Qf3 26.Kg1–+) 25.Rg1 Kh7 26.Rd4 Qf6 27.Qe2 (27.Rg3 Rfe8–+) 27...Rf5 28.f4 Re8 (better 28...Na4 29.Qf3 Re8–+) 29.f3 (29.Qc2–+) 29...Rf4! 30.Rf4 (30.Rf4 Qf4; 30.ef4 Ne6 Double attack (30...Re2 Pinning; 30...Re2 Deflection; 30...Ne6 Decoy; 30...Qd4 Overloading)) 30...Qf4!! 31.Qd1 (31.ef4 Re2 Pinning (31...Re2 Deflection)) 31...Re3 32.Qd5 (32.Qd2 Rf3 33.Qf4 Rf4–+) 32…Qf3 (32...Qf3 33.Qf3 Rf3–+) 0–1. KLINGON09 (1790) – rudalev (1820), lichess.org, 2020.

5.e3 Bb7 6.c4 Nd7 7.Nf3 Ne7 8.Be2 g6 9.0–0 Bg7 10.Nc3 0–0 11.h3 e4 12.Nd4 f5? (12...Nc5 13.Nb3=) 13.f3?? (better 13.Ne6 Qc8 14.Nf8 Qf8 15.f3+–) 13...Nc5= 14.fe4 fe4 (14...Ne4? 15.Ne6 Qd7 16.Ng7+–; worse 14...Be4 15.Ne4 fe4 16.Qc2+=) 15.Bg4 h5 16.Be6 Kh7 (16...Ne6? 17.Ne6 Rf1 18.Qf1+–) 17.Bd5 (17.Bf7 Qd7 18.Qe2 Ng8=) 17...Bd5 (17...Nd5 18.cd5 Bd4 19.ed4=+) 18.Nd5 (18.cd5!? Bd4 19.ed4=) 18...Nd5=+ 19.cd5 (19.Rf8 Qf8 20.cd5–+) 19...Nd3 (19...Qg5!?–/+) 20.Bc3 (20.Ne6 Nb2 21.Rf8 Bf8=) 20...Rf1 (20...Bd4!? 21.Bd4 Rf1 22.Qf1 Qe7=+) 21.Qf1+= Qg5?? (better 21...Qe7 22.Ne6 Bc3 23.dc3 Nc5 24.Nc5 Rf8+=) 22.Ne6+– Qd5 (22...Qf5 23.Ng7 Qf1 24.Rf1+–) 23.Ng7 (23.Qf7 Rg8 24.Nf8 Kh8 25.Qg6 Qf5 26.Qh6 Qh7 27.Qh7) 23...Ne5? (23...Qg8 24.Qf6 Rf8+–) 24.Qf6 Rg8 25.Ne6 Re8 (25...c6 26.bc6 b5 27.ab5 Qb5 28.Be5 Qe5 29.Ng5 Qg5 30.Qg5+–) 26.Ng5 (26.Qg7) 26...Kh6+– 27.Rf1 Nf3 (27...Qg8 28.Ne4 Re6 29.Qg5 Kg7 30.Nf6 Rf6 31.Qf6 Kh6 32.g4+–) 28.gf3 (28.Nf3 ef3 29.Qg7 Kg5 30.Rf3 Qe5 31.Be5 Re6 32.Rf4 h4 33.Rg4 Kf5 34.e4) 28...Qg5 29.Qg5 Kg5 30.fe4 Re4 31.Rf4 (better 31.Bd4 Kh4 32.Kg2+–) 31...Rf4 32.ef4 Kf4 33.Kf2 (better 33.Bf6 Ke4 34.Bd8+–) 33...g5? (33...Kf5 34.Kf3+–) 34.Kg2 (better 34.Bf6!? Ke4 35.Bg5+–) 34...Ke4 35.Kg3 (35.Bf6 Kd5 36.Bg5+–) 35...d5? (better 35...Kd3+–) 36.h4?? (36.Bf6 g4 37.hg4 hg4 38.Bd8+–) 36...g4 (better 36...gh4 37.Kh4 d4=) 37.Bf6+– d4? (better 37...Kd3 38.Be5 Kc4+–) 38.Bd8+– Kd5 39.Bc7 Kc4?? (39...Kc5 40.Bb6 Kb6+–) 40.Bb6 Kb4 (40...Kd5 41.Ba5 Kc5 42.Bb4 Kb6 43.d3+–) 41.Bd4 Ka4 42.b6 Kb5 43.b7 Kc4 44.b8Q (better 44.Bc3 a4+–) 44...Kd4 45.Qb5 (45.Qb5 a4 46.Qa4 Kd3 47.Qd7 Kc2 48.d4 Kb2 49.Qb5 Kc2 50.d5 Kd2 51.d6 Kc3 52.d7 Kd2 53.d8Q Kc1 54.Qe2 Kb1 55.Qdd1) 1–0. RichardSommer (2110) – biancoazzurro92 (2145), lichess.org, 2020.

5.e3 c6 (5...Nf6 6.Nf3=) 6.bc6+= Nc6 7.Bb5 Bd7 8.Nf3 (8.Ne2 Nf6+=) 8...Qc8 (8...Rc8 9.Nc3=) 9.0–0+= Nb4 (9...Nf6 10.c4+=) 10.Bd7 (10.Nc3 Nf6+=) 10...Qd7 11.d3 (11.Nc3 Nf6+=) 11...Qc7 (11...Nf6 12.e4+=) 12.c3 (12.Nc3 Rd8+/–) 12...Nc6+= 13.Qb3 h6 (13...Nf6 14.c4+=) 14.Nbd2 (14.c4 Nf6+/–) 14...g5 (14...Nf6 15.c4+/–) 15.Ne4 (15.Rab1 Nf6+/–) 15...g4 (15...Rc8 16.Rab1+/–) 16.Nfd2 Bg7 (16...Rd8!?+/–) 17.Nc4 (better is 17.Ba3 Bf8 18.Qd5+–) 17...f5?? (better is 17...Rd8 18.Ba3 Bf8 19.Nb6 Rb8+–) 18.Ned6 (18.Ncd6 Kd7 19.Nb5 Qb8 20.Qd5 Ke7+–) 18...Kd8 19.Nb6 Rb8 (19...Qd6 20.Na8 Ke8+–) 20.Nf7 (20.Nf7 Ke7 21.Nh8 Bh8 22.Ba3 Kf6 23.Qg8 Rg8 24.Nd5 Kf7 25.Nc7+–) 1–0. Wall,Bill – SubChaser, internet, 2001.

5.e3 Be6 6.c4 (6.d4 Nd7=) 6...Nd7 7.Be2 Ngf6 (7...Qg5 8.h4 Qg6 9.h5=) 8.Qc2 Be7 (8...e4 9.Nc3 Nc5 10.Ba3=) 9.Bf3 (9.Nf3 0–0=) 9...Rb8 10.Nc3 (10.Ne2 0–0=) 10...Nc5 (10...Bc4 11.Ne4 Be6 12.Ng5=+) 11.Be2 (11.d4 Ncd7 12.d5 Bg4+=) 11...0–0 (11...d5 12.d4 ed4 13.ed4=) 12.Nf3 (12.d4 ed4 13.ed4 Ncd7+=) 12...Qc8 (12...Qd7 13.d4 Bf5 14.Qd1 ed4 15.Nd4+= (worse 15.Qd4 Nb3 16.Qd1 Na1 17.Qa1 c5–/+)) 13.d4 ed4 (13...Bf5 14.Qd1 e4 15.Nd2+=) 14.Nd4+= Bd7 (14...Qd7 15.0–0+=) 15.0–0+– Ne6 (15...Qe8 16.Bf3+–) 16.Bf3 (better 16.Nf5!? Bd8 17.Nd5 Nd5 18.cd5+–) 16...Nd4+= 17.ed4 c6 18.Ne4 (18.Rae1!? Re8 19.d5+=) 18...cb5= 19.Nf6 Bf6 20.Be2? (better 20.ab5!? Bb5 21.Rfc1=) 20...ba4 (20...bc4 21.Qc4 Qc4 22.Bc4–+) 21.Bd3–/+ b5 (better 21...d5–/+) 22.cb5? (better 22.Bh7!? Kh8 23.Bd3 bc4 24.Be4–/+) 22...Qc2–+ 23.Bc2 Bb5 24.Ba4?? (24.Rfb1–+) 24...Bf1 25.Ba3 (25.Bc3 Bd3 26.Ba5 Rfc8–+) 25...Bb5 26.Bd6 Bd4 (better 26...Ba4 27.h3 Bc6 28.Bb8 Rb8 29.Rc1–+) 27.Bf8 (27.Rb1 Ba4 28.Rb8 Rb8 29.Bb8 Bb5–+) 27…Ba1 (27...Ba1 28.Bd6 Rb7 29.Bb5 Rb5–+) 0–1. AhmedSultanov (1755) – M_a_t_r_i_x__am (1760), lichess.org, 2019.

5.e3 g6 6.c4 (6.d4 Bg7+=) 6...Bg7 7.Nf3 Ne7 (7...Bf5 8.Be2+=) 8.Be2 Nd7 9.0–0 0–0 10.Nc3 h5 (10...Nf5 11.d4+=) 11.h3 Nc5 12.d4 ed4 13.Nd4 Bb7 14.Bf3 Bf3 15.Qf3 (worse 15.gf3 Re8=+) 15...Kh7 16.Nd5 Nd5 17.Qd5 Qd7 18.Ra2 Rae8 19.Nc6 (19.Rb1 f5=) 19...Bb2=+ 20.Rb2 f5 21.Ra2 Re4 Black intends f4 (21...f4 22.ef4 Rf4 23.Rc1=+) 22.Rd1= Qf7 Black prepares f4 23.Qf7 Rf7 24.Rd4 Kg7 25.Kf1 f4 (25...Nb3 26.Re4 fe4=) 26.Ke2 (better 26.Re4!? Ne4 27.Nd8=) 26...fe3–/+ 27.fe3 Re6?? (better 27...Re8–/+) 28.Nd8+– Rfe7 29.Ne6 Re6 30.Kf3 Kf6 (30...g5 31.g4+–) 31.Rf4 Kg5 (31...Kg7 32.h4+–) 32.Rf7 (32.h4 Kh6+–) 32...Re4? (better 32...Rf6 33.Rf6 Kf6+–) 33.Rc7+– Rc4 (33...Re6 34.Rd2+–) 34.Rc6 d5 (34...Rc1 35.Rb6 Rf1 36.Rf2+–) 35.Rb6 (35.Rd2 Kh6 36.Rd5 Rc1+–) 35...Rc3 (35...Na4 36.Ra6+–) 36.Ke2 (better 36.Rd2 Nd3 37.Rd6 Ne5 38.Ke2+–) 36...Ne4 37.Rc6 Rb3 38.Kf3 h4 (38...Rb1 39.Rac2 Ra1+–) 39.Rd2 (better 39.Ra6+–) 39...Nd2–+ 40.Ke2 Nc4 41.Rc5 (41.e4 Re3 42.Kf2 Re4–+ (42...de4?! 43.Rc4 Kf4 44.Rc6=)) 41...Ne3 (better 41...Re3!? 42.Kf2 Rd3 43.Ke2–+) 42.b6 Ng2 (better 42...Nc4!? 43.Rd5 Kh6 44.Rd4 Nb6 45.Rh4 Kg7 46.Re4–+) 43.Rd5 Kh6 (43...Kf6 44.Rb5 Nf4 45.Kf1 Rf3 46.Kg1 Rg3 47.Kf1=) 44.Rb5 Nf4 45.Kd1 Rd3 (45...Rh3 46.b7 Rd3 47.Kc2–+) 46.Kc2 Rd8 (46...Rh3? 47.b7 Ne2 48.b8Q Nd4 49.Kd2 Nb5 50.ab5+– (50.Qb5?! Ra3+–)) 47.Ra5 Nh3 48.Rb5 Ng5 49.b7 (49.a5 Ne6 50.Rb4 Nd4 51.Rd4 Rd4 52.a6=) 49...Rb8 50.a5 h3?? (50...Ne6 51.Rb4 Nc5 52.Rh4 Kg7=+) 51.Rb4 (better 51.a6 h2 52.a7 Rb7 53.Rb7+=) 51...Kh5?? (better 51...Ne6 52.a6 h2=) 52.a6+– h2 53.a7?? (better 53.Rb1 Kh4 54.Rh1+–) 53...Rb7+= 54.Rb7 h1Q 55.a8Q Qe4 56.Kb3 Qd3 57.Ka4 Qc4 58.Ka3 Qc3 59.Ka2 Qc2 60.Rb2 Qc4 61.Kb1 Qd3 (61...Qe4 62.Qe4 Ne4 63.Rg2=) 62.Kc1 (62.Kc1 Qe3 63.Kd1 Qf3 64.Qf3 Nf3 65.Rg2=; 62.Ka1 Qf1 63.Rb1 Qf6 64.Ka2 Qe6 65.Rb3 Ne4=) 1–0. RichardSommer (2180) – mikhalital (2175), lichess.org, 2020.

4.a4 c5

5.c4 b6 6.e3 f5 7.Nf3 (7.d4 cd4 8.ed4+=) 7...g6? (7...e4 8.Ng1=) 8.Be2 (better 8.Ne5!? de5 9.Be5+–) 8...Bg7 9.d4 Qe7 (9...cd4 10.ed4 e4 11.Nfd2+=) 10.de5 (10.0–0 Bb7+=) 10...de5 11.0–0 (better 11.Nc3!?+=) 11...e4–/+ 12.Bg7 Qg7 13.Ng5?? (better 13.Ra2 ef3 14.Bf3–/+) 13...Qa1–+ 14.Qd5 (14.Qd6 Ne7 15.Qb6 Nd7–+ (worse 15...Qa4 16.Qf6 Rf8 17.Qg7–+)) 14...Ra7 15.Rd1 (15.Qd6 Rb7 16.Rd1–+) 15...Nd7 (better 15...Qf6–+) 16.Qe6 (16.Qf7 Kd8 17.Ne6) 16...Ne7 (16...Kd8 17.Qb6 Rc7 18.Ne6 Ke7 19.Qc7 Ngf6 20.Qd6 Ke8 21.Nc5 Qb2+–) 17.Qf7 Kd8 18.Ne6 1–0. BeepBeepImAJeep (2560) – FrogPrince (1730), lichess.org, 2017.

5.e3 Be7 6.d3 Nf6 7.Nf3 Bg4 8.Be2 Nbd7 9.Nbd2 Nd5 (9...0–0!?=) 10.0–0 N7f6 11.e4 (11.Ne1 Be6+=) 11...Nf4= 12.h3 Bh5 13.Nh4?? (better 13.Rb1=) 0–1. aravind555 – selvasaravanan123, lichess.org, 2018.

5.g3 Nd7 6.Bg2 Nb6 7.Nc3 Nf6 8.Nf3 h6 9.0–0 g5 10.h3 Nfd5 11.Nd5 Nd5 12.Ng5 (12.d3!?+=) 12...hg5+= 13.Bd5 Rh3 14.Bg2 Rh7 15.e3 Be6 (better is 15...Bg7+=) 16.Bb7+/– Rb8 17.Bc6 Bd7 18.Bd7 Qd7 19.Qf3 Qh3 20.Qg2 Qg4 21.f3 Qf5 22.e4 Qe6 23.d3 Be7 24.c4 Kd7 25.f4 Rbh8 26.Rf2 Rh1 27.Qh1 Rh1 28.Kh1 Qh3 29.Rh2 Qg3 30.fe5 de5 31.Rg1 Qd3–+ 32.Be5? Qe4 33.Rhg2 Qe5 34.Rg5 Bg5 35.Rg5 Qg5 (35...Qg5 36.Kh2 f5 37.b6 f4 38.b7 Qg3 39.Kh1 f3 40.b8N Ke6 41.Nc6 Qg2#) 0–1. wk1234 – bbk48, kurnik, 2012.

4.a4 c6

5.c4 cb5 6.ab5 Nd7 7.e3 Nc5 (7...Ngf6 8.d4=) 8.Bc3 (8.d4 ed4 9.ed4 Ne4+=) 8...Qf6 (8...Nf6!?=) 9.Ra5+– Ne4 10.Ra8?? (better 10.Qf3 Ra5 11.Ba5+–) 10…Qf2 0–1. AhmedSultanov (1700) – marmat30 (1705), lichess.org, 2019.

5.c4 Bd7 6.e3 Qc7 7.d4 ed4 (7...Nf6 8.Nd2=) 8.ed4 Nf6 9.Nd2 Be7 10.Be2 0–0 11.Ngf3 Bg4 12.0–0 d5 13.c5 cb5 14.ab5 b6 15.c6 Bb4 16.Ba3 Ba3 17.Ra3 a4 (17...Bf5 18.Re1+/–) 18.h3 (18.Ra4 Ra4 19.Qa4 Re8+–) 18...Bf5 (18...Bf3 19.Nf3 Qe7 20.Qd3+/–) 19.Ne5 Ne4 20.Ne4 de4 (20...Be4 21.Ra4 Ra4 22.Qa4+–) 21.Bg4 (21.Ra4 Ra4 22.Qa4 Qd8+–) 21...Bg4 22.Ng4 Rd8 23.Ra4+– Ra4 24.Qa4 Rd5 25.Rd1 Rg5 26.d5 Qf4 27.d6 h5 28.Ne3 Rf5 29.Nf5 (29.Nf5 Qf5 30.c7+–) 1–0. popovicigelu – ferit1, kurnik, 2011.

5.c4 Nf6 6.e3 Be6 7.Nf3 h6 (7...Be7 8.Be2=) 8.Nc3 Be7 9.Be2 Qb6 10.0–0 Qc5 (10...0–0 11.d4+=) 11.d4 ed4 12.ed4 Qb4 13.Na2?? (better 13.Qc1 Bc4 14.Ba3 Be2 15.Bb4 Bf1 16.Bd6 (16.Qf1?! ab4 17.Nd1 0–0+=; 16.Kf1?! ab4 17.bc6 bc3 18.cb7 Ra7+=) 16...Bd6 17.Qe3 Kd8 18.Rf1+–) 13...Qb2–+ 14.d5?? (14.Qd3 cb5 15.ab5–/+) 14...Bf5 (better 14...cd5 15.cd5 Bd5–+) 15.dc6 bc6 16.Nd4 Bg6 (16...Be4!? 17.Re1–+) 17.Bf3 Ne4 (better 17...Be4–+) 18.Re1? (better 18.Nc6 Nc6 19.Qd5–+) 18...d5?? (better 18...Nf2 19.Qe2 Nh3 20.Kh1 Qe2 21.Re2 Nf4–+) 19.Re2= Qa3 20.bc6 Nc3?? (20...Na6 21.Nb5 Qc5 22.cd5+–) 21.Re7?? (21.Nc3 Qc3 22.Nb5 Qd3 23.Nc7 Kf8+–) 21...Qe7?? (21...Ke7 22.Qe1 Ne4 23.cd5 f5 24.Nf5 Bf5 25.Be4 Be4 26.Qe4 Kd8 27.c7 Kc7 28.d6 Kd6 29.Qg6 Kc7 30.Qg7 Nd7 31.Rc1 Qc1 32.Nc1 Rhe8 33.Qc3 Kb6+–) 22.Nc3+– 0–0 23.cd5 Qc5 (23...Na6 24.Ndb5 Rae8 25.d6+–) 24.Ndb5 (24.Ncb5 Na6 25.d6 Qg5+–) 24...Na6 25.Rc1 (25.d6 Rad8 26.Nd5 Bc2+–) 25...Nb4 26.Ne4 White plans d6 26...Qe7 (26...Qb6 27.d6 Na2 28.Rc4+–) 27.Nc5 (27.d6 Qe5 28.c7 Na6+–) 27...Rfc8 (27...Na2 28.d6 Qh4+–) 28.Nb7 (better 28.d6 Qg5 29.c7+–) 28...Nd3 (28...Bc2 29.Qd2 Ba4+–) 29.Rc3 (29.d6 Qg5 30.Rc3 Re8 31.Rd3 Bd3+–) 29...Ne5? (better 29...Re8 30.h3 Qb4+–) 30.d6 Nf3 31.gf3 (31.Rf3!? Qe4 32.Rc3 Re8+–) 31...Qg5 32.Kf1 Bf5 33.d7 Bh3 34.Ke2 Rc7?? (34...Rf8+–) 35.Qd2 (better 35.Nc7 Qe5 36.Re3 Qc7 37.Re8 Kh7 38.Qd3 f5 39.Qc3+–) 35...Rd7 (35...Qd2 36.Kd2 Rc6 37.Rc6 Bd7 38.Rc5+–) 36.cd7 (better 36.Qg5 hg5 37.cd7 Bd7 38.Rc5+–) 36...Qe5 (36...Qe7 37.Kd1 Qd7 38.Qd7 Bd7+–) 37.Kd3 (better 37.Re3 Qa1 38.Re8 Kh7 39.Qd3 f5 40.Kd2 Qb2 41.Qc2 Qc2 42.Kc2+–) 37...Bf5= 38.Kc4 (38.Kc4 Be6 39.Kd3 Bf5 40.Kc4 Be6 41.Kd3 Bf5=) 1–0. AhmedSultanov (1820) – KO5 (1835), lichess.org, 2019.

5.e3 f5 (5...Nf6 6.Be2=) 6.c4 Nf6 7.Nf3 e4 8.Nd4 g6 (8...Be7 9.Be2=) 9.Be2 Bg7 10.0–0 0–0 11.f4 Ne8 12.Nc3 Nc7 (12...Qb6 13.Kh1=) 13.Nb3 b6 14.d4 c5 15.dc5 dc5 16.Qc2 Be6 17.Rad1 Qe8 (17...Nd7 18.Rd2+=) 18.Nd5+– Bd5 19.cd5 The passed pawn on d5 quickly leads to threats (worse 19.Rd5 Nd5 20.cd5 Bb2 21.Qb2 Nd7–/+) 19...Nd7 20.Bg7 Kg7 21.Bc4 Qd8 22.d6 Ne8 23.Bd5 (23.g4!?+–) 23...Rc8 24.Bc6 Ndf6?? (24...Rf6 25.Qc3 Kh6 26.Nd2 Rd6 27.Nc4 Rd1 28.Rd1+–) 25.Nd2 (better 25.d7!? Rc6 26.de8N Qe8 27.bc6 Qe6+–) 25...Nd6? (better 25...Qd6 26.Nc4 Qc7=) 26.Nc4+– Nc4 27.Rd8 (27.Qc4 Qe7=+) 27...Ne3 28.Rf8 Rf8 (28...Nc2?? 29.Rc8 Ne3 30.Re1+–) 29.Qc3 Nf1 30.Kf1 Rd8 (30...Kh6 31.Qe5 Nh5 32.Qc7+–) 31.Qe5 Kf7 (31...Rf8+–) 32.Qc7 Ke6 33.Qd8 (33.Qd8 Kf7 34.Qb6+–) 1–0. BeepBeepImAJeep (2635) – jonkristinn (2325), lichess.org, 2016.

5.e4 cb5 (5...Nf6=) 6.g3 (better 6.Bb5!? Bd7 7.Nf3+=) 6...b4 7.f4 (7.d4 ed4 8.Bg2 Nf6=+) 7...Nc6 (7...ef4 8.Qf3 fg3 9.hg3–/+) 8.Nf3 Bg4 (8...ef4 9.gf4 Nf6 10.Qe2–/+) 9.Bb5 Be7 (9...ef4 10.gf4 Qe7 11.0–0–/+) 10.0–0 (10.h3 Bd7 11.fe5 de5 12.Ne5 Ne5 13.Bd7 Nd7 14.Bg7–+) 10...Nf6–/+ 11.fe5 Bf3 (better 11...de5!? 12.Be5 0–0 13.Bc6 bc6–/+) 12.Qf3= de5 13.Be5 The passed pawn on d2 will quickly become a dangerous weapon 13...0–0 14.Bf6 Bf6 15.c3 Ne5 16.Qg2 b6 (16...Rc8!?=+) 17.d4+= Ng4 18.Qf3?? (18.e5 Ne3 19.Qf2 Bg5+=) 18...Nh6?? (better 18...Bd4 19.Kh1 Ne5–+) 19.e5+= Be7 20.Rd1 bc3 21.Nc3 (worse 21.Qc3 Nf5 22.Na3 f6+=) 21...Rc8 22.Rd2?? (better 22.Nd5+–) 22...Bb4–/+ 23.Rc1 Qg5 (better 23...Nf5! 24.d5 Qg5–/+) 24.Rdc2+= Ba3 (24...Rfd8!? 25.Ne2 Rc2 26.Rc2 Qf5+=) 25.Rd1+– Bb4 26.Ne4 Qe7 27.Rf2 Rcd8 28.Kg2 g6? (better 28...Qe6!?+–) 29.Nf6 Kg7 30.Qf4 Qb7 31.d5 Ng8 32.Bc6 Qa7 33.Ng8 Kg8 34.Qh6 (better 34.d6!?+–) 34...Qe7+– 35.Qf4 (better 35.Re2+–) 35...Bc5?? (35...Qa7 36.d6 Rc8+–) 36.Rf3 g5 (36...Bd6 37.Re3 Bb4 38.d6+–) 37.Qf5 f6 38.ef6 Qf7 (better 38...Qe2 39.Kh3 Kh8+–) 39.Qg5 Qg6 40.Qe5 Bd6 41.Qe6 Qf7 42.Qg4 (42.Rd4 Bc5 43.Rg4 Kh8+–) 42...Qg6 (42...Kh8+–) 43.Qe6 (better 43.Bd7 Qg4 44.Bg4 Kh8+–) 43...Rf7?? (43...Qf7 44.g4 Bc7+–) 44.Rd4+– Kf8 (44...h5+–) 45.Rg4 Qh6 (45...Qg4 46.Qg4 Bc5 47.d6 Bd6 48.Qe6 Bc5 49.Rd3 Rdd7 50.Rd7 Be7 51.Rd8 Bd8 52.Qe8) 46.Be8! Qh5 (46...Re8 Theme: Deflection from d6 47.Qd6 A beautiful mate combination) 47.Bf7 (47.Rf5 Bc5 48.Rh5 Re8 49.Rhg5 Re6 50.Rg8) 47...Qf7+– 48.Rg7 Qe6 49.de6 Rc8 50.Rh7 (50.Rh7 Rc2 51.Kh3+–) 1–0. bolu – bgnagy, net–chess.com, 2020.

4.a4 Nd7

5.e3 Nc5 6.c4 e4 7.f3 (7.d4 ed3 8.Bd3 Be6=) 7...f5 (7...Be6 8.Bd4=+) 8.fe4 (8.Nh3=) 8...Ne4 (better 8...Qh4!? 9.g3 Qe4=) 9.Nf3+= Ngf6 10.Be2 Be6 11.0–0 g6 (11...d5 12.Nd4 Qd7 13.Ne6 Qe6 14.cd5 Nd5 15.Bc4+–) 12.Nd4+– Bf7 (12...Qe7 13.d3 Nc5 14.e4+–) 13.Bf3 (13.d3!? Nc5 14.e4+–) 13...Bg7+= (13...Bc4? 14.d3 Bd3 15.Qd3+–) 14.Nc3 (14.d3 Nc5+=) 14...0–0 (14...Bc4 15.d3 Nc3 16.Bc3+–) 15.Ne4 (15.d3 Nc5+=) 15...Ne4 (15...fe4 16.Be2=) 16.d3+= Nc5 17.Qc2 (17.Qd2 Qg5+=) 17...Qe7 (17...Qg5 18.Rae1=) 18.Rfe1 Rae8 19.e4 (19.Re2!?=) 19...fe4 20.de4 (20.Be4 Qf6=+) 20...Qg5 21.Re2 (21.Rad1 Nd7–/+) 21...Be5 22.g3? (22.Rf2 Nd7–/+) 22...Ne6?? (better 22...Qf6 23.Qd2 Bc4–+) 23.Ne6 (23.Rd1!?=+) 23...Be6–/+ 24.Be5? (better 24.Ra3–/+) 24...Qe5–+ (24...de5?! 25.Qc3=; 24...Rf3?! 25.Bd4=+) 25.Ra3 (25.Rf1 Qc5 26.Kg2 Bc4 27.Rff2 Be2 28.Re2–+) 25...Qd4 (better 25...Qc5 26.Rf2 Qa3–+) 26.Kg2=+ Bc4 (better 26...b6=+) 27.Rd2+= Qc5 28.Rc3 Rf3 29.Kf3 (29.Rf3!? c6 30.Rf6+=) 29...Rf8 30.Kg2 Bf1 (30...Rf1!? 31.Rc4 Rg1 32.Kf3 Rf1 33.Ke2 Qf2 34.Kd3 Qf3 35.Kd4 Qf6 36.Ke3 Qf3 37.Kd4 Qf6 38.Kd3 Qf3 39.Kd4=) 31.Kh1+= Qe5 (better 31...Bc4! 32.Qc1 d5+=) 32.Rc7+– White launches an attack 32...Bh3 Threatening mate... how? 33.Rd1 Bg4 (33...d5 34.Rb7 Bg4+–) 34.Re1 (34.Qc4 Kh8 35.Re1 Qf6+–) 34...Bf3 (better 34...d5!? 35.Qc5 Bf3 36.Kg1 Qb2+–) 35.Kg1+– Qd4 (35...d5 36.Rb7 Be4 37.Qd1=) 36.Qf2 Threatening mate: Qxd4 36...Qa4?? (36...Qe5 37.Qa2 Kh8 38.Rf7 (38.Rb7? Qd4 39.Qf2 Qf2 40.Kf2 Be4 41.Kg1 Bb7–+) 38...Qd4 39.Kf1 Qd3 40.Kf2+–) 37.Rf1 (better 37.Qb2 Rf7 38.Rec1+–) 37...Qb5 38.Rc3 a4 (38...Qh5 39.Rf3 Rf3 40.Qf3 Qf3 41.Rf3+–) 39.Rf3 Rf3 40.Qf3 Qe8 41.Qa3 (41.Qf6 b5+–) 41...Qd7 (41...Qe4 42.Qd6 Qe3 43.Kg2 Qe2 44.Rf2+–) 42.Rd1 b5 43.Rd6 Qe8 (43...Qa7 44.Kg2 Qc7+–) 44.Qa2 Kg7 45.Rb6 (better 45.Qb2 Kg8 46.Qf6 a3+–) 45...Qd7 (45...Qe4 46.Qb2 Kh6 47.Qd2 Kg7 48.Qc3 Kh6 49.Rb5 a3+–) 46.Qb1 (better 46.Qb2 Kh6 47.Rb5 Qa7 48.Kg2+–) 46...Qd4–+ 47.Kg2 Qb6 48.Qb2 Kh6 (48...Kf7 49.Qh8 h5 50.Qh7 Ke8 51.Qg8 Kd7 52.Qf7 Kc8 53.Kf3–+) 49.e5 (better 49.Qd2 g5 50.Qd7–/+) 49...b4?? (better 49...Qc6 50.Kf2 Qc5 51.Kf3 Kg7–+) 50.Qd2=+ Kg7 (better 50...g5 51.Qd6 Qd6 52.ed6 b3=) 51.Qd6?? (better 51.Qd7 Kh8 52.Qa4 Qb7 53.Kf2=) 51...Qd6–+ 52.ed6 Kf7 53.Kf3 Ke6 (53...b3!? 54.Ke3 b2 55.d7–+) 54.Ke3 Kd6 (54...a3 55.Kd4 a2 56.Kc4–+) 55.Kd4 (55.Kd4 a3 56.Kc4–+; 55.Kd2 Kd5 56.Kc2 Kc4–+). RichardSommer (2105) – letalcrisis (2105), lichess.org, 2020.

5.e3 Ngf6 6.Be2 g6 7.c4 Bg7 8.Nc3 0–0 9.Nf3 Re8 10.d3 c6 11.Qc2 d5 12.cd5 cd5 13.0–0 b6 14.Rfd1 Bb7 15.Rac1 Rc8 16.Qb3 Nc5 17.Qc2 d4 18.Ne5 dc3 19.Bc3 Nd5 20.f4?? (20.Nc6 Bc6 21.Bg7 Kg7 22.bc6 Rc6 23.d4–+) 20...Ne3 21.Qa2 Bd5 (21...Bd5 22.Qd2 Nd1 23.Bd1 f6–+; 21...Nd1?? 22.Qf7 Kh8 23.Ng6 hg6 24.Qg7#) 0–1. Diviak,Ru (1885) – Farrand,J (2095), 2nd Pilsen Open, 2010.

4.a4 Be7

5.c4 Bf6 6.Nf3 e4 7.Nd4 c5 8.bc6 bc6 (better is 8...Nc6 9.Nc6 bc6=+) 9.Nc3?? (9.Qc2=) 9...c5?? (better is 9...Bd4 10.e3 Be5–+) 10.Ndb5+/– Bf5 11.e3 Ne7 12.Rb1 Nec6? (12...Bc3 13.Nc3 Nbc6+/–) 13.Be2?? (better is 13.Nd5 Na6 14.Bf6 gf6 15.d3+–) 13...Nb4 14.0–0 Nd3?? (better is 14...0–0+=) 15.Bd3+– ed3 16.Nd5 (better is 16.Qf3 Na6 17.Qf5 0–0+–) 16...Bb2 17.Rb2 (17.Ndc7!? Kf8 18.Rb2 Ra6 19.Na6 Na6+–) 17...Na6 18.f3?? (better is 18.Qf3 Bc8 19.Nbc7 Nc7 20.Nc7 Qc7 21.Qa8+–) 18...0–0 19.e4 Be6 20.Qb3 Bd5 21.cd5 Nb4 22.f4 Qb6 (22...Qe7 23.Qc4=+) 23.Kh1 c4 (better is 23...Rae8!? 24.Qc4 Qd8=+) 24.Qc4+= Rac8 25.Qd4 (better is 25.Rb4 ab4 26.Qd3= (< 26.Qb4 Qf2 27.Rg1 Qf4–/+)) 25...Rc2?? (better is 25...Qd4 26.Nd4 Rfe8=+) 26.Qb6+– Rb2 27.Nd6 Rd2 (27...Ra2 28.Qa5 Rb2 29.Nf5+–) 28.Qa5 Rb2 29.Nc4 Rc8 (29...Rb3 30.Qb6 h6+–) 30.Nb2 d2 31.Qb4 h6 32.Qd2 1–0. stoker – chessdv8, Live Game Caissa's Web, 2004.

5.e3 Bf6 6.Nf3 Ne7 7.h3 Nf5 8.Nc3 e4 9.Nh2 d5 10.Be2 h5 11.d3 g5 12.de4 Nh4 13.0–0 g4 14.hg4 hg4 15.Bg4 Bg4 16.Qg4 Qe7 17.Nd5 Qd6 18.Nf6 Ke7 19.Nd5 1–0. chybol3 – moherowy, kurnik, 2012.

4.a4 f5

5.Nc3 Nf6 6.g3 (6.d4 e4=) 6...d5+= 7.e3 d4 8.ed4 ed4 9.Nce2 Qd5 10.f3 Bd6 (10...Bc5 11.Nf4 Qd6 12.Bc4=) 11.Bg2 (11.Nd4!? 0–0 12.Nge2=) 11...c5= 12.Nh3 0–0 13.0–0 Re8 14.Nef4 Qc4 15.d3 Qf7 16.Ng5 (16.c3 dc3 17.Bc3 h6=) 16...Qc7+= 17.Ne2 (17.Ngh3!?+=) 17...Qe7 18.Re1?? (better is 18.Rf2–/+) 18...Qe3–+ 19.Kh1 Qg5 20.f4 Qh5 21.Ng1 Re1 22.Qe1 Ng4 23.h4 (23.Bd5 Kf8 24.Qe2 Qe8–+) 23...Ne3 24.Bf3 Qf7 25.Qe2 Nd7 26.c3 dc3 27.Bc3 Nd5 28.Be5 Ne5 29.fe5 Be7 30.Re1 Be6 31.Nh3 f4 32.Nf4 Nf4 33.gf4 Qf4 34.Bb7 Qh4 35.Kg1 c4 36.Ba8 (36.d4 Qd4 37.Kg2–+) 36...Bc5 37.Kf1 Bh3 38.Bg2 Qf4 0–1. booklover – EytonWiener, ChessWorld.net, 2015.

5.e3 Nf6 6.c4 Be7 7.Nf3 0–0 8.Be2 Be6 (8...c6 9.0–0=) 9.0–0 Nbd7 (9...Bc8 10.Qb3=) 10.Nc3 (10.d4 e4 11.Ng5 Bf7+=) 10...Ne4 11.h3 (11.Nd5 Bf6+=) 11...g5 (11...Nc3 12.Bc3 f4 13.Qc2=) 12.Qc2 (12.d4+=) 12...Qe8 (12...Nc3!? 13.Bc3 g4 14.hg4 fg4=) 13.Ne4+– fe4 14.Qe4 Bf5? (better 14...Nc5 15.Qc2 g4 16.hg4 Bg4+–) 15.Qb7+– Nc5 (15...Qc8 16.Qc8 Rac8+–) 16.Qc6?? (16.Qc7 Rc8 17.Qa5 Nb3+–) 16...Qg6? Black prepares e4 (better 16...Qc8 17.d4 Be4 18.Qa8 Ba8 19.dc5 Bf3 20.Bf3 Rf3 21.gf3 Qh3+–) 17.d4 (17.Qc7?! Bd8 18.Ne5 Qe6+= (18...Bc7? 19.Ng6 Bg6 20.d4+–)) 17...Nd3 (17...ed4 A) 18.Nd4?! Be4 19.Qc7 Bd8+=; B) 18.Qc7 Bd8 19.Ne5 Qe6–/+ (worse 19...Bc7 20.Ng6 Bg6 21.Bd4+=); C) 18.ed4 Ne6 19.Rfe1+–) 18.Bc3 e4 19.Nh2 (19.Nd2 Ra7+–) 19...h5 Black intends g4 (19...Ra7 20.f3 Nb4 21.Bb4 ab4 22.b6 cb6 23.Qb6+–) 20.Qc7 Bf6 (20...Bd8 21.Qb7 Rc8 22.b6 Rc4 23.Ba5+–) 21.f4 (better 21.Qd6 Rfd8 22.Qb6 g4 23.hg4 hg4 24.Ng4 Bg4 25.Bg4 Qg4 26.Qf6 Rf8+–) 21...g4 (21...gf4 22.Bd3 Bh3 23.Ra2 ed3 24.Rf4+–) 22.hg4 (22.Qd6?! gh3 23.g4 hg4 24.Bd3 Rad8+–) 22...hg4 23.g3 Rf7 (23...Bg7 24.Qc6+– (24.Ba5?! Rfc8+–)) 24.Qd6 Rd8 25.Qa6 Rh7 26.Qa5 (better 26.Bd3 ed3 27.Ba5 (27.Qa5?! Rh2 28.Kh2 Qh5 29.Kg1 Be4+=) 27...Rd4 28.Bc3+– (28.ed4?! Bd4 29.Rf2 Bf2 30.Kf2 Rh2 31.Kg1 Qa6 32.ba6 Re2+–)) 26...Qh6–+ Do you see the mate threat? 27.Ng4 (27.Rf2 Nf2 28.Kf2 Qh2 29.Ke1 Qg3 30.Kd2–+) 27…Qh1 0–1. RichardSommer (2130) – Antimonys (2170), lichess.org, 2020.

5.e3 Nf6 6.Be2 g6 7.Nf3 e4 (7...Bh6 8.Nc3+=) 8.Nd4 c5 9.bc6 bc6 (9...Nc6 10.0–0+–) 10.Nc3 Bg7 11.Rb1 0–0 12.Ba3 (12.d3 c5 13.Ndb5 d5+–) 12...Rf7? (12...c5 13.Ndb5 Nc6 14.d3 ed3 15.cd3=) 13.Bc4 (better 13.Rb8!? Rb8 14.Nc6+–) 13...d5= 14.Ba2 (14.Be2=) 14...Ng4 (14...Bd7=) 15.Nce2?? (better 15.Rb8 Rb8 16.Nc6+–) 15...f4–/+ 16.ef4 Bd4 17.Nd4 Rf4 (better 17...Qf6 18.h3 Qf4–/+) 18.f3?? (18.Rb8 Rb8 19.Nc6–+) 18...ef3–+ 19.Nf3 Ba6 (better 19...Ra4 20.Rb3 Qe8 21.Kf1 Ba6 22.Kg1 Bc4–+) 20.d3 Ra4 21.Rb3 Ra3! 22.Ra3 Qe7 23.Ne5?? (23.Qe2 Qa3 24.Qe6 Kg7 25.Qg4 Qb4 (25...Qa2 26.0–0 Qa3 27.Nd4+–) 26.Qb4 ab4–/+) 23...Qa3 (better 23...Ne5 24.Qe2 Qa3 25.Qe5 Qc1 (25...Qa2 26.Qe8 Kg7 27.0–0 Kh6 28.Qf8 Kh5 29.Qf3 Kh6 30.Qf4 g5 31.Qf6 Kh5 32.Qf7 Kh4 33.Qh7 Kg4 34.Qh3) 26.Ke2 Qc2 (26...Qh1?! 27.Qe8 Kg7 28.Qe7 Kh6 29.Qh4 Kg7 30.Qe7 Kg8 31.Qe8 Kg7 32.Qe7=) 27.Ke1 Qc1 (27...Qa2?! 28.Qe8 Kg7 29.Qe7 Kh6 30.Qh4 Kg7 31.Qe7 Kg8 32.Qe8 Kg7 33.Qe7=) 28.Ke2 Bd3 (28...Qh1?! 29.Qe8 Kg7 30.Qe7 Kh6 31.Qh4 Kg7 32.Qe7 Kg8 33.Qe8 Kg7 34.Qe7=) 29.Kf3 Qc5–+ (29...Qh1?! 30.Qe8 Kg7 31.Qe7 Kh6 32.Qh4 Kg7 33.Qe7 Kg8 34.Qe8 Kg7 35.Qe7=)) 24.Ng4 Qb4 (24...Qa2 25.0–0 Nd7 26.Qe1+–) 25.Kf2 Qd4 26.Kg3 h5 27.Nf2 (27.h3 hg4 28.Qe2 Qf6 29.Qe8 Kg7–+) 27...Qe5 (better 27...h4!? 28.Kh3 Qf2 29.Qg4–+) 28.Kf3 Ra7?? (better 28...Qf6 29.Ke3 Nd7–+) 29.g3 Rf7 30.Kg2 Qe3 (30...a4 31.Re1 Qb2 32.Re8 Kg7 33.Nh3–/+) 31.Rf1–/+ Bc8 (31...Nd7 32.Qe1 Qf3 33.Kg1–/+) 32.c4 (32.Qe1 Qe1 33.Re1 Na6–/+) 32...Be6 (32...Na6 33.Qe1 Qf3 34.Kg1–+) 33.Qe1 (better 33.cd5 cd5 34.Qe1–/+) 33...Qf3?? (better 33...d4–+) 34.Kg1=+ Rf6 35.cd5 (worse 35.Qa5 Bh3 36.Qd8 Rf8 37.Qf8 Qf8 38.Nh3 Qa3–+) 35...cd5 36.Bb3 (36.Qa5 Nd7=) 36...Nc6=+ 37.Bd1 Qf5 38.Be2? (better 38.Qc3!? Bc8 39.Ba4–/+) 38...Nd4 (38...Qe5 39.Kg2–+) 39.Bd1 Nc6 40.Be2 Qe5 41.Bd1 (41.Kg2 a4–+) 41...Qd4 42.Kg2 Qb2 (42...a4 43.g4 Ne5 44.Qa5 Ng4 45.Ng4 Rf1 46.Kf1 Bg4 47.Qd8 Kf7 48.Qc7 Ke6 49.Qc6 Ke7 50.Bg4 hg4 51.Qc7 Kf6 52.Qd6 Kg5 53.Ke2–+) 43.Qe2? (better 43.Qe3–+) 43...Qe2 44.Be2 Nb4?? (better 44...Nd4 45.Bd1 Bd7–+) 45.Ra1=+ Nc6 46.Bd1 (46.Rf1 Nd4 47.Re1–+) 46...Kf8 (46...Rf8 47.g4–/+) 47.Ba4=+ Nd8 48.Bb5 Nb7 49.Nd1? (49.Bc6 Bh3 50.Nh3 Rc6=+) 49...Ke7 (better 49...d4!? 50.Bc4 Bc4 51.dc4 Ke7–+) 50.Nc3=+ Rf5 (50...d4 51.Ne2=+) 51.Ne2 Re5 52.Nd4 Kd6 53.Ba6 Bc8?? (53...Nc5 54.Ra5 Re1 55.Kf2=) 54.Bb7?? (better 54.Rc1 Re8 55.Nb5 Ke7 56.Na7+–) 54...Bb7= 55.Ra5 Re3 56.Rb5 Rd3 57.Rb7 Rd4 58.Rb6 Ke5 59.Rg6 h4 60.Rg8 Rd2 61.Kh3 hg3 62.hg3 d4 63.g4 d3 64.g5 Rd1 65.Kg2 Ra1 66.Rd8 Ke4 67.Kf2 Ra5 68.Re8 Kd4 69.Rd8 Kc3 70.Rc8? (better 70.g6 Rg5 71.Rc8 Kd2 72.Rc6=) 70...Kd2–+ 71.g6?? (71.Rg8 Rc5 72.Kf3–+) 71...Rf5 72.Kg3 Rg5 73.Kf4 Rg6 74.Rd8 Re6 75.Ra8 (75.Kf3 Kc2–+) 75…Ke2 0–1. Souza,Kim Garcia De (1745) – Da Silva Junior,SM (2010), Curitiba Brazil, IEPCopel Open, 2017.

5.e3 Nf6 6.Nf3 Nbd7 7.c4 e4 8.Nd4 Nc5 9.Nc3 g5 10.Nd5 Nd5 11.Qh5 Kd7 12.cd5 Qf6 13.Nc6 1–0. Woda – Clearman.

5.Nf3 Nf6 6.e3 Be7 7.Nc3 0–0 8.Be2 f4 9.0–0 fe3 10.de3 Kh8 11.Bd3 Nbd7 12.e4 Qe8 13.h3 Nb6 14.Re1 Nh5 15.Nd5 Nd5 16.ed5 Nf4 17.Be4 Qh5 18.Re3 Bf5 19.Bf5 Qf5 20.Kh1 Qg6 21.Ne1 Bh4 22.Qd2 Bg5 23.Qd1 Ng2! 24.Ng2 (24.Ng2 Be3 Combination; 24.Kg2 Bf4 Double attack (24...Be3 Discovered attack)) 24...Be3 25.Ne3 Qe4 26.Kg1 Rf3 27.Qf1 Raf8 28.Ra3 Qh4 29.Nd1 Ra3 30.Ba3 Qa4 31.Qd3 e4 32.Qc3 Qb5 33.Bb2 Rf7 34.Ne3 (34.Qd4 Qe2 35.Nc3 Qc2 36.Ne4 a4–+) 34...Qe2 35.Nf5 Qd1 36.Kh2 h6 (36...Qd5?! 37.Qg7 Rg7 38.Bg7 Kg8 39.Ne7 Kg7 40.Nd5–/+) 37.Qe3 Qd5 (37...Qc2 38.Bg7 Kg8 39.Bf6+/–) 38.Qh6 (38.Ng7 Kh7 39.Ne8 Qe6 40.Nf6 Rf6 41.Bf6 Qf6 42.Qe4 Kg7 43.Qg4 Qg6 44.Qd7 Qf7 45.Qg4 Kf6–+) 38...Kg8 39.Ng7 Rf2 40.Kg3 e3 (40...Rc2 41.Ne6 Rg2 42.Kg2 e3 43.Kg3 Kf7 44.Qf6 Ke8 45.Qd8 Kf7 46.Qd7 Kg6 47.Qg7 Kf5 48.Qg4) 41.Qe6 Qe6 42.Ne6 Rc2 (42...Rc2 43.Bf6 Kf7–+) 0–1. Clay56 – EytonWiener, ChessWorld.net, 2015.

5.Nf3 Nf6 6.e3 g6 7.Bc4 Bg7 8.Ba2 Qe7 9.Qe2 e4 10.Nd4 c5 11.bc6 bc6 12.Na3 d5 13.Nb3 Nbd7 14.d3 0–0 15.d4 Nb6 16.Nc5 Nfd7 17.Nd7 Qd7 (< 17...Nd7 18.0–0=+) 18.Bb3 c5 19.c4 Na4 20.Ba4 Qa4 21.cd5 Qb4 22.Qd2 Ba6 23.Bc3 Qb3 24.f4 ef3 25.gf3 Qd5 26.Kf2 cd4 27.ed4 Rac8 28.Nc2? (28.Kg2–+) 28...Bb7 29.Qd3 Qf3! 30.Qf3 Bf3 (31.Kf3 Rc3 32.Ne3 f4 33.Ra5 fe3 34.Ke4 e2–+) 0–1. Althoff,Guntram (2185) – Lugovoi,Aleksei (2505), Wichern op 5th, 1999.

4.c4 a4

5.a3 c6 6.Nc3 Bd7 7.e3 Qb6 (7...Qa5 8.Nf3+=) 8.Na4+= Ra4? (better is 8...Qa5 9.Nc3 Nf6+/–) 9.Qa4+– Nf6 10.Nf3 Be7 11.Be2 0–0 12.0–0 Ne4 (12...Rc8 13.bc6 Nc6 14.Qc2+–) 13.Qc2 f5 14.Bd3 (14.d4!? ed4 15.Bd4 c5+–) 14...Nc5 15.Rab1?? e4+/– 16.Be2 ef3 17.Bf3 f4?? 18.ef4?? Bf5= 19.Qc1 Bb1 20.Qb1 Nbd7 21.a4 Rf4=+ 22.Re1 Bf6 23.Re8 Nf8 24.Bf6 Rf6 25.d4 Na4?? 26.Qe4?? Nc3 27.Qe7?? Qd4–+ 28.h3 Rf3! 29.gf3 Qf6 30.Qb7?? cb5 31.cb5 Nd1 32.Qd5+– Kh8 33.Qd1?? h6?? 34.b6 Qg5?? 35.Kf1 Qb5 36.Qe2 Qb1 37.Kg2 Qg6 38.Kh2 Kg8 39.b7 Kh7 40.Rf8 (40.Rf8 Qc2 41.Qc2 g6 42.Qc7#) 1–0. bluepiramid2 (1725) – pakuszka, kurnik, 2011.

5.a3 f5 6.g3 Nf6 7.Bg2 Be7 8.d3 0–0 9.Nc3 Ra7 10.e3 b6 11.Nge2 Bb7 12.Nd5 Nd5 13.cd5 Nd7 14.d4 e4 15.0–0 Nf6 16.Nf4 Bd5 17.Nd5 Nd5 18.Qc2 Kh8 19.Rac1 Qd7 20.Qc4 Nf6 21.d5 Ne8 22.Rfd1 Bf6 23.Bf6 Rf6 24.Bh3 g6 25.Bf1 Rf7 26.Qd4 Kg8 27.Rc6 Re7 28.Rdc1 Re5 29.R1c4 Qf7 30.Ra4 Ra4 31.Qa4 Qd5 32.Bc4 1–0. racvac001 (1690) – garlicjuice (1615), kurnik, 2012.

4.c4 b6

5.a4 Nd7 6.e3 Bb7 7.Nf3 f5 8.d4+= e4 9.Nfd2 c6 (9...Qg5 10.h4 Qe7 11.d5=) 10.Be2 (10.bc6 Bc6 11.Nc3 Ngf6+–) 10...cb5+= 11.cb5 Ngf6 12.0–0 Be7 13.f3 0–0 14.fe4 fe4 (worse 14...Be4 15.Nc3+–) 15.Nc3 Rc8 16.Qb3 d5 (16...Kh8 17.Rf2=) 17.Rac1 (17.Nde4 Bb4+–) 17...Bb4 (17...Rf7 18.g4 h6 19.h4=) 18.Ndb1 (18.Nce4!? Rc1 19.Nf6 Nf6 20.Bc1+=) 18...Qe8 19.Ba3 Ba3 20.Qa3 Qg6 21.Qd6 Rce8 (21...Qh6 22.Rf4=) 22.Rf4+= Bc8?? (better 22...Rc8+=) 23.Nd5+– Qh6 24.Nf6 Nf6 25.Qb6 Nd5 (25...Be6 26.Nc3+–) 26.Rf8 (26.Qh6 gh6 27.Bc4 Rf4 28.Bd5 Rf7 29.Bf7 Kf7 30.Rc7 Kg6+–) 26...Rf8 (26...Kf8 27.Rf1 Nf6+–) 27.Qh6 gh6 28.Bc4 Bb7 (28...Be6 29.Nc3 Nc7 30.b6+–) 29.Nc3 (29.Nc3 Rd8 30.Nd5 Bd5 31.Bd5 Rd5 32.b6+–) 1–0. retiponziani (1920) – rayzrating (1935), ChessWorld.net, 2015.

5.a4 Nd7 6.Nf3 Bb7 7.e3 g6 (7...Ngf6 8.Be2=) 8.d4 Bg7 9.d5 Nh6 10.Nbd2 f5 11.Be2 0–0 12.Qc2 Nc5 (12...Bc8 13.Nb3+=) 13.0–0–0 (13.0–0 Qf6=) 13...f4 (13...Ng4 14.Rhf1=) 14.ef4 (14.e4 Ng4 15.Rdf1 Bc8=) 14...ef4 (14...Bc8 15.fe5 Bf5–/+) 15.Bg7+= Kg7 16.Nd4 (16.Ne4 Ne4 17.Qe4 Ng4+=) 16...Re8 (16...Nf5 17.Ne4=) 17.Bf3+= Qf6 18.Ne4 Ne4 19.Be4 Bc8 20.f3 (20.Rhe1 Kg8+=) 20...Nf5 21.Nf5 gf5 22.Bd3+= Re3 23.Rhe1 Bd7 24.Re3 fe3= 25.Qb2 Re8 26.Qf6 Kf6 27.Re1 h6 28.f4+= h5 29.h4 Rg8= 30.Rg1 Rg3 31.Be2+– Be8 32.Kc2 Rg7 33.Kd3 Re7 34.Re1 Re4 35.g3 Re7 36.Bf3 Rg7 37.Ke3 Rg3? 38.Kf2+– Rg8 39.Re6 Kg7 40.Re7 Kf6 41.Rc7 Rg7 42.Rc8 Re7 43.Rb8 Bf7 44.Rb6 (44...Rc7 45.Rd6 Ke7 46.Rc6 Rc6 47.dc6 (< 47.bc6 Be8+–) 47...Bc4 48.b6+–) 1–0. Nielsen,Joergen Axel – Mosegaard,Klaus, DK, 1973.

5.Nc3 Bb7 6.Qc2 Nf6 7.e4 g6 8.Nge2 Bg7 9.d3 0–0 10.g3 Nh5 11.Nd5 c6 12.bc6 Nc6 13.Bg2 f5 14.0–0 Ne7 15.f4 fe4 16.de4 Nd5 17.cd5 Ba6 18.fe5 Qg5 19.Rf8 Rf8 20.Qc1 Qg4 21.Nd4 Ng3 22.Qe3 Ne2 23.Ne2 Qe2 24.Qe2 Be2 25.Rc1 Be5 26.Be5 de5 27.Rc7 Rf6 ½–½. Jamieson,Ian M – McBride,John, Scottish CCA Webserver Open – Section A, 2007.

5.Nc3 Bb7 6.Qc2 Nf6 7.e4 g6 (7...c6 8.Nf3=) 8.Nge2 Bg7 9.g3 (9.d4 Nbd7=) 9...0–0 (9...Ne4 10.Ne4 f5 11.Bg2 Be4 12.Be4 fe4 13.Qe4+=) 10.Bg2+= Nbd7 11.0–0 Nh5 12.Nd5 Nc5 (12...c6 13.bc6 Bc6 14.f4+=) 13.f4+/– c6 14.bc6 Bc6 15.d4 Na4 16.Ba3 ed4 17.Rad1 (17.e5 d3 18.Qd3 Nc5 19.Bc5 bc5+/–) 17...b5 (17...Nc5 18.Nd4 Bd5 19.cd5 Bd4 20.Rd4+=) 18.Nd4 Bd5 (18...Bd4 19.Rd4 b4 20.Bc1+/–) 19.Nb5+/– (19.cd5?! Qb6 20.e5 Rac8+=; < 19.ed5 Qb6 20.Qf2 bc4=+) 19...Qb6 20.Kh1 Nc3 21.Nc3 (21.Rd5?! Nd5 22.ed5 Rfd8=) 21...Bc4 22.Nd5 Bd5 23.Rd5 (23.ed5?! Rfc8 24.Qa4 Rab8=) 23...Rac8 (23...Rfc8 24.Qa4+/–) 24.Qd2 (24.Qb3 Qb3 25.ab3 Rfe8 26.Ra5 Nf6+–) 24...Rc3 25.Rd6+– Qb8 26.Rd3 Rd3+/– 27.Qd3 Rd8 28.Qc2 Nf6 29.e5 Ne8 30.Rb1 Qa7 31.Qc5 Qa6 32.Qe7 Qd3 33.Rf1 Rb8 34.f5! gf5 35.e6 fe6 36.Qe6 Kh8 37.Qf5?? Qa3–+ 38.Be4 Nf6 39.Bb1 Qd6 40.Qa5?? Qc6 41.Kg1 Ng4 42.Qd2 Qc5 43.Kh1 Ne3 44.Re1?? Qc6 45.Kg1 Qb6 46.Qd3?? Nc2 (47.Kh1 Qb7 48.Qe4 Ne1 49.Qb7 Rb7–+) 0–1. Katalymov,Boris N (2390) – Grigorian,Karen Ashotovich (2470), URS–chT Moscow, 1972.

5.Nc3 Nd7 6.e3 Bb7 7.d4 f5 8.Nf3 e4 9.Nd2 Ngf6 10.Be2 Qe7 11.Qc2 g5 12.0–0–0 Bg7 13.Rde1 c5 14.d5 Ne5 15.Na4 Nfd7 16.f4 ef3 17.Nf3 Rf8 18.Ne5 Be5 (18...de5!? 19.g4 f4+/–) 19.Bd3+/– Bb2 20.Nb2 Qe5 21.g3 Nf6 22.Na4 (22.Bf5?! Nd5 23.e4 Nc3=) 22...Nd7 (22...Ng4!?+/–) 23.Rhf1+– 0–0–0 24.Bf5 Kc7 25.g4 h6 26.Nb2 Qe7 27.Nd3 Ne5 28.Ne5 Qe5 29.Qb2 Rfe8 30.Qe5 Re5 31.Be6 Re4+/– 32.Rf7 Kb8 33.Ref1 Rc4 34.Kd2 Ra4= 35.Rh7 Ra2+= 36.Kc3 Rh2 37.Rff7+= Ba8 38.Bd7?? Bd5–+ 39.Re7 Ba8?? 40.Bc6+– Rh4 41.Ra7 Bc6 42.bc6 Rh8 43.Rhb7 (43.Rhb7 Kc8 44.Ra8) 1–0. Grabmeier,Johannes (1900) – Haslsperger,Martin (1980), Regionalliga SO, 2008.

5.d4 Nd7 6.e3 Bb7 7.Nf3 e4 (7...Ngf6 8.Be2+=) 8.Nfd2 Ngf6 9.Nc3 g6 (9...Qe7 10.Qc2+/–) 10.d5 Bg7 11.Nce4 0–0 12.Nf6 Bf6 13.Bf6 Qf6 14.Be2 Qc3 (14...Rfe8 15.0–0+/–) 15.Rc1 Qa3 16.Qc2 f5 17.0–0 a4 18.Nf3 (18.Rfe1 Nc5+–) 18...Rfe8 (18...Nc5 19.Rce1+–) 19.Nd4 Re5 20.Rfd1 Nc5 21.Bd3 Qb4 22.Rd2 a3 23.Rb1 Qa4 24.Qc3 Rae8 25.Bc2 Qa8 26.Re2 R8e7? (26...R5e7 27.Bd3+–) 27.Rbe1 (better is 27.Nf3!? Ne4 28.Qb4 Nc5+–) 27...Ne4 28.Be4 fe4 29.Rb1 Qa4 30.Rb3 Rg5 31.Nc2 Qa5?? 32.Qa5 ba5 33.Ra3 Bc8 34.Ra5 Rf7 35.Nd4 Bg4 36.Rb2 Bf3 37.Ra8 Kg7 38.Ne6 Kh6 39.Ng5 Kg5 40.gf3 ef3 41.Ra7 Kh4 42.b6 1–0. Irrgang,Michael – Bergzog,Thomas, Troisdorf op, 1999.

5.d4 e4 =.

5.e3 c6 6.Nc3 (6.d4 e4+=) 6...Nf6= 7.Nf3 cb5 8.Nb5 Nc6 (8...Be7 9.d3+=) 9.d4+= e4 (9...Bg4 10.h3 Bd7 11.de5 de5 12.Ne5 Bb4 13.Ke2 Ne5 14.Be5+/–) 10.d5+/– Na7 11.Nfd4 Nb5 12.Nc6 Qc7 13.cb5 Be7 14.Rc1 Qd7 15.Qd4 0–0 16.Be2 Re8 17.Ne7 Re7 18.Qb6+/– Nd5 19.Qd4 Nf6 20.0–0 Bb7 21.b6 Qe6 22.Rc7 Rc7 23.bc7 Ne8 24.Rc1+– d5 25.Ba3 Rc8? 26.Qa7 Rc7 27.Rc7 Nc7 28.Qb7 Qe5 29.Qb8 (29.Qb8 Qe8 30.Qc7+–) 1–0. Fournier,Frederic (2240) – Dragon5 (1740), echecsemail.com Partie libre, 2007.

5.e3 Be7 6.Be2 (6.d4 ed4 7.Bd4 Nf6+=) 6...Nf6 7.Nc3 (7.d4 ed4 8.Bd4 Be6=) 7...Bb7 (7...0–0 8.Nf3=) 8.Nf3 Bf3 (better is 8...0–0!?=) 9.Bf3+/– (9.gf3?! 0–0=) 9...Ra7 10.0–0 0–0 11.d4 ed4 12.ed4 d5 (12...Re8!?+/–) 13.Nd5+– Nd5 14.Bd5 (14.cd5?! a4+/–) 14...Bh4 (14...Qd7 15.Qf3+–) 15.g3 (15.Re1 Be7+–) 15...Bg5 (15...Be7 16.Qf3+–) 16.Re1 Qf6 (16...Be7 17.Re3+–) 17.Ba3 Re8 (17...c5 18.bc6 Rc8+–) 18.Re8# 1–0. marre – gast, internet, 2010.

5.e3 f5 6.d4 e4 7.Ne2 d5 8.Nf4 Nf6 9.cd5 Bb4 10.Nd2 0–0 11.Bc4 Bd6 12.Ne6 Be6 13.de6 Be7 14.0–0 a4 15.Rc1 a3 16.Ba1 c6 17.f3 cb5 18.Bb5 Ra5 19.Bc4 b5 20.Bb3 b4 21.Nc4 Nc6? 22.fe4 fe4 23.Na5 Na5 24.d5 Nb3 25.Qb3 Re8 26.Bf6 gf6 27.Rf4 Bd6 28.Re4 f5 29.Rec4 Qf6 30.g3 h5 31.Qd3 Kg7 32.Rf1 Rf8 33.Qd4 Rb8 34.Rf5 Qd4 35.Rf7 Kg6 36.ed4 (< 36.Rd4 b3 37.ab3 Rb3+–) 1–0. Sribar,P (2190) – Trempetic,M (2055), Open B, Zagreb CRO, 2009.

5.e3 Nf6 (--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5 5.c4 b6).

5.Nf3 Bb7 6.e3 Nd7 7.Be2 g6 8.d4 Bg7 9.d5 Ngf6 10.Nc3 0–0 11.0–0 Nc5 12.Nd2 Re8 13.Na4 Na4 14.Qa4 Bc8 15.Qc2 Ng4 16.Qd1 Nf6 17.Qc2 Bd7 (17...Ng4 18.e4+=) 18.a4 Bh6 19.Rad1 Ng4 20.Ba1 Qe7 21.e4 Bd2 (21...f5 22.Bd3 fe4 23.Ne4=) 22.Bg4 Bf4 23.Bd7 Qd7 24.Bb2 Rf8 (24...f5 25.Bc1+=) 25.Bc1 (25.g3 Bh6+=) 25...Qg4 26.Qd3 f5 27.f3 Qg5 28.Bf4 Qf4 29.Qd2 (29.Rde1 Rac8+=) 29...Qd2 (better is 29...fe4!? 30.Qe2 ef3 31.Rf3 Qh4=+) 30.Rd2= f4 31.g4 fg3 32.hg3 Rf6 33.Rdf2 Raf8 34.Kg2 g5 35.Kg1 (35.Rh1 g4 36.Rhf1 gf3 37.Rf3 Rf3 38.Rf3 Rf3 39.Kf3 h5+=) 35...Kg7 36.g4 Kg6 37.Kg2 h5 38.gh5 Kh5 39.Rh1 Kg6 40.Kg3 Rf4 41.Rhh2 R8f7 42.Rh8 Rh7 (better is 42...g4–/+) 43.Rh7+= Kh7 44.Rh2 Kg6 45.Rh8 Rf7 ½–½. Schmidbauer,Josef – Wandl,Johann, Niederbayern–chB, 1998.

5.Nf3 f5 6.Nc3 Nf6 7.g3 g6 8.Bg2 Bb7 9.0–0 Bg7 10.Ng5 Bg2 11.Kg2 Qe7 12.d4 e4 13.c5 h6 14.cd6 Qd6 15.Nh3 0–0 16.Qb3 Kh7 17.Ba3+– (17.Ba3 Qd4 18.Bf8 Bf8 19.Rad1+–) 1–0. Schellen,Anton – Hennink,Aldo (1635), OP–2010–0–01195, 2010.

5.Nf3 Nf6 6.d4 e4 7.Nfd2 =.

5.Nf3 g6 6.g3 Bg7 7.Bg2 Bb7 8.0–0 Ne7 9.d4 Nd7 10.Re1 0–0 11.Ne5 Bg2 12.Nd7 Qd7 13.Kg2 d5 14.Na3 dc4 15.e4 Rad8 16.Qc2 Nc8 (better is 16...c6!? 17.Qc4 c5+=) 17.Qc4+/– Nd6 18.Qd3 Nb7 19.Rad1 Nc5 20.Qe2 (20.dc5 Qd3 21.Rd3 Rd3 22.Bg7 Kg7 23.cb6 cb6+= (worse is 23...Ra3 24.bc7 Rc3 25.b6+/–)) 20...Ne6 21.d5 Nc5 22.Bg7 Kg7 23.e5 Qe7 24.Nc4 Na4 25.Qf3 Qb4 26.Re4 Nc3? 27.a3+– Qb3 28.Rc1 black resigned 1–0. pcmvr – alencro (2410), net–chess.com, 2012.

5.g3 Bb7 6.Nf3 g6 (6...Nf6 7.Bg2=) 7.Bg2+= Bg7 8.0–0 (8.0–0 Nf6 9.d4+=). Woelfelschneider,Peter – Schoeffel, 2009.

5.e3 Bb7

6.Nc3 Nd7 7.d3 f5 8.Qe2 Ngf6 9.0–0–0 a4 10.a3 Be7 11.Qc2 Nc5 12.h3 0–0 13.d4 Nb3 14.Kb1 ed4 15.ed4 Qd7 16.f3 d5 17.cd5 Bd5 18.Nd5 Nd5 (18...Qd5?? 19.Bc4+– (19.Qc7?! Bd6 20.Qc6 Rfc8 21.Qd5 Nd5+=)) 19.Bc4 Kh8 20.Bd5 (20.Bb3? ab3 21.Qc6 Qd8–+) 20...Qd5 21.Qc7 Bf6 22.Qb6 Rfc8 23.Ne2 Rab8 24.Nc3 Qc4 (24...Rb6? 25.Nd5 Rb5 26.Nf6 gf6 27.Rhe1+–) 25.Qd6 Bd4 (25...Nd4 26.Rd4 Bd4 27.Na4 Rb5 28.Ka1 Bb2 29.Nb2–+) 26.Rd4 Nd4 (26...Qd4?! 27.Qd4 Nd4 28.b6 Rb6 29.Na4–/+) 27.b6 Qd3 28.Ka2 Qc4?? (28...Rd8 29.Qb4 Nc2 30.Qa4–+) 29.Kb1 Qd3?? (29...Rd8 30.Qc7 Qd3 31.Ka2–+) 30.Ka2 Rd8 31.Qc7 Rbc8 32.Qe7 Re8 33.Qd7 Rcd8 (better is 33...Qc4!? 34.Kb1 Red8 35.Qa4 Qd3 36.Ka2 Qe3–+ (< 36...Rc3 37.Rd1 Qe2 38.Rd4 Qe6 39.Kb1=+)) 34.Qa4 Ra8?? (better is 34...Ne2 35.Nb5 Re7–/+) 35.Rd1+– Ra4 36.Rd3 Nc6?? (36...Rc4+–) 37.Na4 (37…Kg8 38.Rd7+–) 1–0. Bonetti,Shane – esr (2045), ICC, 2002.

6.Nc3 Nf6 7.Nf3 Nbd7 8.Be2 Qe7 9.0–0 0–0–0 (9...e4 10.Nd4+=) 10.d4+/– g5 (10...h6 11.d5+/–) 11.Qc2 (11.Ng5 Rg8 12.Nf3 e4+/–) 11...g4 (11...h6 12.d5+=) 12.Ne1 (12.Nh4 e4+/–) 12...h5+= 13.Na4 (13.Rc1 Bg7+=) 13...Ne4 (13...h4 14.c5 dc5 15.dc5+=) 14.Nd3 Rg8 15.c5 dc5 16.dc5 (16.Ne5? Ne5 17.Kh1 Qh4–+) 16...bc5 (16...Nec5 17.Nac5 Nc5 18.Nc5 Qc5 19.Qf5 Kb8 20.Rfd1= (< 20.Qh5 Qd5 21.f3 Qd2–/+; 20.Be5? Bd6–+; < 20.Qe5 Rd2 21.Rfe1 Qc2–/+)) 17.Ba3 (17.Bc3 Nc3 18.Qc3 e4+=) 17...Qh4 (17...h4=+) 18.Rad1 (better is 18.Rac1!?+=) 18...Ng5 (better is 18...g3 19.hg3 Ng3 20.fg3 Qg3–+) 19.Qc4?? (19.Nac5 Bg2 20.Na6–+) 19...Qh3! 20.Ne1 (20.gh3 Nh3 Mate attack) 20...Bg2 21.f3 (21.b6 Bf3 22.b7 Bb7 23.Rd7 Rd7 24.Bb2 Qe3 25.Ng2 (25.fe3?? Nh3) 25...Nh3 26.Kh1 Nf2 27.Rf2 Qf2 28.Nb6 cb6 29.Qd5 Rd5 30.Bd4 Rd4 31.Bg4 hg4 32.a4 Bg2) 21…g3 (22.Nb6 cb6 23.Qc5 Bc5 24.hg3 Be3 25.Rf2 Qh1#) 0–1. Stoliar,EJ – Kellner,John Vincent, corr Australia ch–8, 1966.

6.d4 Nd7 7.Nf3 Bf3 8.Qf3 ed4 9.ed4 Ngf6 10.Bd3 Be7 11.0–0 0–0 12.Nc3 Re8 13.Rfe1 Bf8 14.Re8 Ne8 15.Re1 Ndf6 16.a4 g6 17.Bc1 Bg7 18.Bg5 Rc8? 19.Nd5 h6 20.Ne7 Kh7 21.h4 (21.h4 c5 22.h5+–) 1–0. Rooijen Van,Peter (1655) – Zimmermann,Jan Erik, 8. LSS No Engine Cup Preliminary, 2009.

6.Nf3 Nd7 7.d4 ed4 8.Nd4 Be7 9.Be2 Ngf6 10.Bf3 Bf3 11.Qf3 0–0 12.Nc6 Qe8 13.Nd2 Bd8 14.0–0 Ne5 15.Ne5 de5 16.Qa8 Qe6 17.Qc6 Qf5 18.Nf3 e4 19.Nd2 Qg6 20.Bf6 Bf6 21.Rad1 Be5 22.Qg6 hg6 23.Ne4 f5 24.Ng5 Re8 25.e4 f4 26.f3 Bf6 27.Rd5 Be5 28.Rfd1 Bd6 29.e5 Bc5 30.Kf1 Kf8 31.Rd8 Rd8 32.Rd8 Ke7 33.Rg8 Bd4 34.Rg7 Kf8 35.Rf7 Kg8 36.e6 Bc5 37.Ke2 a4 38.e7 Be7 39.Re7 a3 40.Rc7 Kf8 41.Ra7 Ke8 42.Ra3 Ke7 43.Ra6 Kd6 44.Rb6 Ke5 45.Re6 Kf5 46.b6 Kg5 47.b7 Kf5 48.Re4 g5 49.b8Q Kg6 50.Re6 Kg7 51.Qc7 Kf8 52.Rb6 g4 53.Rb8 1–0. druhynejhorsi (1880) – rodos56 (1675), kurnik, 2012.

6.Nf3 Nd7 7.Be2 Ngf6 8.0–0 Be7 9.d4 ed4 10.Nd4 0–0 11.Bf3 Bf3 12.Qf3 Ne5 13.Qe2 Nfd7 14.f4 Ng6 15.Nc6 Qe8 16.e4 Bf6 17.Bf6 Nf6 18.Nd2 Ne7 19.Nd4 c5 20.N4f3 Ng6 21.Rae1 Nf4=+ 22.Qe3 Ng6 23.Qd3 Qe7 24.h4 Ne5 25.Ne5 de5 26.Rd1 Rad8 27.Qe2 Rd4 28.Rf5?? Rfd8 29.Kf2 Qd6 30.Ke1 g6 31.Rf3 Ng4 32.g3 h5 33.Rc3 Kg7 34.Rf3 f6 35.Rc3 Qd7 36.Rf3 Nh6 37.Rc3 Qh3 38.Rf3 Ng4 39.Qf1?? Qh2 40.Qe2 Qg1 41.Rf1 Qg3 (41...Qg3 42.Rf2 Nh2–+) 0–1. carocan (1700) – futuromestre (1715), kurnik, 2012.

6.Nf3 Be7 7.Be2 e4 8.Nd4 Nf6 9.0–0 +=.

6.Nf3 Be7 7.Be2 Bf6 8.Nc3 Nd7 9.0–0 g6 (9...c6 10.bc6 Bc6 11.e4+/–) 10.Rc1 Bg7 11.Ba3 (11.d4!?+/–) 11...e4+= 12.Nd4 Nc5 13.f3 Nf6 14.fe4 Nfe4 15.Ne4 Ne4 16.Bf3 0–0 17.d3 Nc5 18.Nc6 (18.Bb7 Nb7 19.Qf3 Qg5+/–) 18...Qe8 19.Qd2 Bh6 20.Rce1 Nd7 (20...Bg7 21.Bc5 dc5 22.d4+/–) 21.d4 (21.Bb2 Bg7+/–) 21...Bc6 (21...f5!?+/–) 22.Bc6+– Rd8 23.c5 (better is 23.Bb2!?+/–) 23...dc5+= 24.dc5 Nc5 25.Qc3 Bg7 26.Qc5 bc5 27.Be8 Rfe8 (< 27...Rde8 28.Bc5 Bc3 29.Rd1+– (29.Bf8?! Be1 30.Bd6 cd6 31.Re1 f5+=)) 28.Bc5 Rd5 29.Rc1 Bh6 30.Rf3 Red8 ½–½. Schulze,Ulrich (2310) – Kirbach,Thomas, Nuremberg op, 1988.

6.Nf3 Be7 7.Be2 Bf6 8.d4 Nd7 9.0–0 Ne7 10.Qc2 Ng6 11.Rd1 0–0 12.Nc3 Rc8 13.Nd5 Re8 14.Bd3 Bd5 15.cd5 Qe7 16.Bf5+/– Ngf8 17.de5 de5 18.e4 g6 19.Bh3 h5 20.a4 g5 21.Ba3 Qd8 22.Bf5 g4 23.Nd2 Be7 24.Qc6 Ba3 25.Ra3+– Kg7 26.Rg3 Nb8 27.Qc2 Nbd7 28.h3 Ng6 29.hg4 h4 30.Rc3 Nf4 31.Nf3 Nc5 32.Rc4 Rb8 33.Qd2 Qd6 34.Nh4 Rh8 35.g3 Qf6 36.gf4 Qh4 37.Kf1 Qh3 38.Ke1?? Qf3–+ 39.Qc2 Rh1 40.Kd2 Nb3 (40...Nb3 41.Qb3 Qb3 42.Rh1 Qc4 43.Rh7 Kg8 44.fe5 Qd4 45.Ke2 Qa4–+) 0–1. Danek,Vaclav – Beran,Bohumil (2155), Open A, Klatovy CZE, 2004.

6.Nf3 Nf6 7.Be2 Be7 8.0–0 0–0 9.d4 ed4 10.Nd4 Nbd7 11.Nf5 Nc5 (11...Be4 12.Ng3+=) 12.Nd2 Qd7 13.Ne7 (13.Bg4 Kh8+=) 13...Qe7= 14.a4 Rae8 15.Qc2 Nfe4 16.Rfd1? (16.Nf3 f5=) 16...Nd2 (16...Nf2 17.Qc3 Qg5 18.Kf2 Qg2 19.Ke1 Qg1 20.Nf1–+) 17.Qd2? (17.Rd2 Qg5 18.Bf1=+) 17...Qe4?? (better 17...Qg5 18.Bf1 Nb3–+) 18.Bf3= Qc4 (18...Qh4 19.Bb7 Nb7 20.Bd4=) 19.Bb7+= Nb7 20.Rdc1 Qe6 (20...Qb4!? 21.Qb4 ab4 22.Rc7 Nc5+=) 21.Rc7+– Nc5 22.Qc3 (better 22.Rc6!? Qg6 23.Qd6+– (23.Rb6 Nb3 24.Qd6 Na1 25.Qf8 Rf8 26.Rg6 hg6–+)) 22...f6= 23.Rc6 Rc8 24.Rb6?? (better 24.Rc8 Rc8 25.Rc1=) 24...Na4!–+ 25.Qa3?? (25.Ra4 Rc3 Discovered attack) 25...Nb6 26.Qa5 Nc4 (26...Rc2 27.Qb4–+) 27.Qb4 Nb2 28.Qb2 Rb8 29.h3 d5 30.g4 (30.Qb3 Rfc8–+) 30...Qb6 31.Rb1 Rfc8 32.Qb3 Rc5 33.e4 Rb5 (33...Rb5 34.Qb5 Qb5 35.Rb5 Rb5 36.ed5 Rd5–+) 0–1. e4_e5_f4 (1710) – Blitzschnecke01 (1740), lichess.org, 2020.

4.c4 c5

5.e3 e4 6.Nc3 f5 7.Nge2 Qf6 (7...Nd7!?+/–) 8.Nf4+– Be6 (8...Qf7 9.Ncd5 Kd8 10.d4+–) 9.Qc2 g5?? (better is 9...Qe7 10.Ncd5 Bd5 11.Nd5 Qd8+–) 10.Nfd5 (10.Ncd5 Bd5 11.Bf6 Nf6 12.Nd5 Nd5 13.cd5 Bg7+–) 10...Bd5 (10...Qd8 11.Ne4 Bd5 12.cd5 fe4 13.Bh8 Qe7+–) 11.Nd5 (11.cd5?! Bg7+–) 11...Qd8 12.Bh8 Nh6 (12...Nd7 13.g4!+–) 13.Bf6 Be7 (13...Qd7+–) 14.Be7 Qd7 15.Nf6 (better is 15.Qc3!? Qe7 16.Ne7 Ke7+–) 15...Ke7 16.Nd7 Kd7 17.Be2 Kc7 18.d3 Nd7 19.de4 Re8 20.ef5 Ne5 21.Rb1 Neg4 22.b6 Kc6 23.Bf3 (23.Qa4#) 23...Kd7+– 24.Qa4 Kd8 25.Qe8! Ke8 26.Bb7 Nf5 27.Bc8 Ngh6 28.Bf5 Nf5 29.b7 Kd7 30.b8Q Ke6 31.Qc8 Ke5 32.f4! gf4 33.ef4 Ke4 34.0–0 Ne3 35.Rfe1 Kd3 36.Re3! Kc4 37.Rc1 Kb5 38.Qb7 Ka4 39.Qb3# (39.Rc4#) 1–0. olawoj – maxpato, kurnik, 2012.

5.g3 b6 6.Bg2+/– Ra7 7.Nc3 Nf6 8.Qc2 Be7 9.0–0–0 0–0 10.f4 Ng4 11.Rf1 Bb7 12.Bb7 Rb7 13.Nf3 Nd7 14.Nd5 Ngf6 15.Ng5 h6 16.fe5 de5 17.Rf6 hg5 18.Rf5 f6 19.h4 gh4 20.Rh4 Kf7 21.Qe4 Rb8 22.Be5! Ne5 23.Qe5 Bd6 24.Qe4 Rh8 25.Rg4 Qe8 26.Rf6!! gf6 27.Qg6 Ke6 28.Qf6 Kd7 29.Rg7 Kc8 30.Qd6 Rh1 31.Kb2 Rb7 32.Nb6 (32...Rb6 33.Qc7#) 1–0. pierre (2030) – sergeiv, internet, 2006.

4.c4 c6

5.a4 cb5 6.ab5 f5 7.e3 Nf6 8.Nf3 Be7 9.d4 e4 10.Ng5 h6 11.Nh3 0–0 (11...g5 12.Nc3+=) 12.Nf4+= White intends d5 12...g5 (12...Ng4 13.Be2+=) 13.Ne2 (13.Ng6 Rf7+–) 13...Qb6 14.d5 Nbd7 15.Bd4 Nc5 16.Nec3 Nfd7 (16...Qc7 17.Be2+=) 17.Qh5 (17.h4 gh4 18.Qh5 Kh7+=) 17...Kh7+= 18.h4 (better 18.Nd2+=) 18...Nf6?? (18...g4 19.Nd2=) 19.Qe2?? (better 19.Bf6 Rf6 20.hg5+–) 19...g4= 20.f3 (20.Qc2 Nfd7=) 20...ef3 21.gf3 gf3 (21...Qd8 22.Nd2=) 22.Qf3 Nfe4 (better 22...Ng4=) 23.Bh3?? (23.Ne4 fe4 24.Qg3+–) 23...Bh4–+ 24.Kd1 (24.Kf1 Ng3 25.Kg2 Nh1 26.Kh1 Qd8–+) 24...Nf2 25.Kc2 Nfe4?? (better 25...Nh1 26.Qh1 Bf6–+) 26.Qh5 (26.Ne4 Qc7 27.Nc5 dc5+–) 26...Bg5?? (better 26...Qd8 27.Rg1 Ng3–/+) 27.Ra3?? (better 27.Ne4 fe4 28.Bc8+–) 27...Nc3?? (27...Ng3 28.Na4 Qd8–+ (28...Nh5 29.Nb6 Rb8 30.Nd2+–)) 28.Nc3= Bd7 29.Na4 Na4? (better 29...Qc7+=) 30.Bb6+– (30.Ra4?! Qd8+=) 30...Rac8?? (30...Nb6 31.Bf1 Kg7+–) 31.Ra4 (better 31.Bf1 Rg8 32.Ra4+–) 31...Rc4 (31...Bb5 32.Ra5 Rc4 33.Kb3 Be8+–) 32.Rc4 Re8 (32...Re8 33.Qf7 Kh8 34.Bd4 Re5 35.Qd7 Bd8 36.Rc8 Kg8 37.Rd8 Re8 38.Re8; 32...Bc6 33.bc6 a4 34.cb7 Kg7 35.Rc7 Kh8 36.Bd4 Bf6 37.Qh6 Kg8 38.Qh7) 0–1. e4_e5_f4 (1695) – ju_do (1715), lichess.org, 2020.

5.a4 cb5 6.cb5 Bf5 7.Nf3 Nf6 8.e3 (8.d3 Bg4=) 8...Be7 9.d4 ed4 (9...e4!? 10.Nfd2 0–0=) 10.Nd4+= Bg6 11.Bd3 d5 12.0–0 Bd3 13.Qd3 0–0 (13...Nbd7 14.Qf5+=) 14.Nd2 (14.Nf5 Nbd7+–) 14...Nbd7+= 15.Rad1 (15.Nf5 Bb4+=) 15...Bb4 16.N2f3 Nc5 17.Qf5 (better 17.Qc2!?+=) 17...Na4=+ 18.Ba1 Re8 (18...Nc3 19.Rc1 Nfe4 20.Rc2=+) 19.Ne5 (19.Ne2 Nb6=+) 19...Nc3–/+ 20.Rd3 (20.Rc1 Rc8=+) 20...Qe7 (20...Qc8!? 21.Qf4 Nce4–/+) 21.Bc3 Bc3 22.Rc3 Qe5 23.Qe5 Re5 24.Rc7 Rb8 25.Rfc1 Ree8 26.Nf5 (26.b6 Kf8=) 26...Rf8 (26...Red8 27.Re7=) 27.Rd1 (27.Ra1!? Ne8 28.Ne7 Kh8 29.Rc2+=) 27...Rfd8= 28.b6 a4 (28...Kf8!?=) 29.Ra1+= Nd7 (29...Re8 30.Ra4 Re6 31.Rb4+=) 30.Ne7+– Kf8 31.Nd5 Ne5 32.e4 1–0. e4_e5_f4 (1660) – Poker420 (1645), lichess.org, 2020.

5.a4 Bd7 6.e3 Nf6 7.Nf3 (7.d4 e4=) 7...Be7 (7...e4 8.Nd4=) 8.Be2 Ne4 (8...0–0 9.d3=) 9.0–0 f5 10.Nc3 Nf6 11.d3 Be6 (11...0–0 12.Rb1+=) 12.Ng5 Qd7 13.Ne6 Qe6 14.e4 (14.d4 0–0+/–) 14...Nbd7 15.ef5 Qf5 16.Bf3 Rc8 17.Ne4 d5 18.bc6 bc6 19.cd5 cd5 20.Ng3 Qe6= 21.Re1 0–0 22.Nh5 Nh5=+ 23.Bh5 Bc5 24.d4 Bb4 25.Bg4 Qf6?? 26.Rf1 Rc7? 27.Bd7 e4? 28.Bb5+– Qf4 29.g3 Qg5 30.Qe2 Rf3 31.Bc1 Qh5 32.Bf4 Rcc3 33.Be3 Bd6 34.Kg2 Qg6 35.Bd7 h5 36.Rac1 h4 37.Rc3 1–0. Fournier,Frederic – bialypionek, Active, 2005.

5.a4 Nd7 6.Nf3 Ngf6 7.e3 Qb6 8.d4 ed4 9.Bd4 c5 10.Bb2 Be7 11.Bd3 0–0 12.0–0 d5 13.Nbd2 dc4 14.Nc4 Qc7 15.Qc2 g6 16.Rad1 Ng4 17.h3 Ngf6 18.Nfe5 Ne5 19.Be5 Qd8 20.Bg6 fg6 21.Rd8 Rd8 22.Rd1 Rd1 23.Qd1 Bf5 24.Qb3 Rd8 25.Bf6 Bf6 26.Nd6 Kh8 27.Nb7 Rd1 28.Qd1 c4 29.Nd6 c3 30.Nf5 gf5 31.Qc2 f4 32.ef4 Kg7 33.b6 Bd4 34.b7 Ba7 35.Qc3 Kf7 36.Qa5 Bf2 37.Kf2 1–0. hal1958 – Fortissimo, playchess.de, 2002.

5.a4 Be6 6.e3 Nd7 7.Nf3 Ngf6 8.d4 ed4 (8...e4 9.Nfd2=) 9.Nd4 Be7 10.Be2 Rc8 11.Ne6 fe6 12.0–0 0–0 13.Nd2 Nc5 14.Nb3 Nb3 15.Qb3 Qb6? (better is 15...Nd7=) 16.c5!+– Qc5?? 17.Qe6 Rf7 18.Qc8 (18.Qc8 Bf8 19.Bf6 gf6 20.Rac1+–) 1–0. Fournier,Frederic (2210) – balles (1965), Chess21 (1/12), 2002.

5.a4 Be7 6.e4 Nf6 7.d3 d5 (7...Nbd7!?=+) 8.ed5+= cd5 9.Be5 0–0 10.Bc3 (10.Be2!?=) 10...dc4=+ 11.dc4 Ne4 12.Qd8 Rd8 13.f3 Nc3 14.Nc3 Bb4 15.Rc1 Bf5 (15...Nd7!?=+) 16.Kf2= Bc5 17.Kg3 Nd7 18.Ne4 (18.Kf4!? Be6 19.Ne4=) 18...Be4=+ 19.fe4 Nf6 20.Kf3 g5 21.e5= Nd7 22.Re1 Re8 23.Kg4 h6 24.Nf3+= Kg7 25.Bd3+/– Nf8 26.Be4+– Rab8 27.Bd5 Ne6 28.g3 Kg6 29.Be4 Kg7 30.h4 h5 31.Kh5 Rh8? 32.Kg4 gh4 33.Nh4 Rbg8 34.Nf5 Kf8= 35.Kf3 Nd4?? 36.Nd4+– Bd4 37.Rh8 Rh8 38.Bb7 Ke7 39.Re4 Bc5 40.Bd5 Rh1 41.Rf4 Rf1 42.Kg4 Ra1 43.Rf7 Ke8 44.Rc7 Bd4 45.Bc6 Kd8 46.Rd7 Kc8 47.Rd4 Ra4 48.e6 Ra1 49.e7 Re1 50.Rd8 Kc7+– 51.e8Q Re8 52.Re8 a4 53.Re7 Kd6 54.Ra7 Kc5 55.Kf5 Kb6 56.Ra6 Kc5 57.g4 Kc4 58.g5 a3 59.g6 Kc5 60.g7 (60.g7 Kc4 61.g8Q Kc3 62.Ra3 Kb4 63.Qb3 Kc5 64.Qe3 Kd6 65.Qe5#) 1–0. blackiwhite (1685) – cstefan1 (1775), kurnik, 2011.

5.a4 Bf5 6.Nc3 Nf6 7.e3 Be7 8.Be2 0–0 9.Nf3 Nbd7 10.Nh4 Ne4?? (10...Be6 11.Nf3=) 11.Nf3 (better 11.Nf5 Nc3 12.Bc3+–) 11...Nc3= 12.Bc3 Bf6 13.d4 e4 14.Nd2 d5 15.cd5 cd5 16.Nb3 b6 17.Bg4 Bg4 18.Qg4 Rc8 19.Bb2 Rc2 20.Ba3 Qc7 21.Bf8?? (better 21.0–0 Rd8 22.Rfc1=) 21...Qc3–+ 22.Kf1 Nf8 23.g3 Qb3 24.h4 (24.Kg1 Be7–+) 24...Qc4 (better 24...Qb2 25.Kg2 Rf2 26.Kh3 Qc3–+) 25.Kg2 Qe2?? (better 25...Ne6–+) 26.Qe2=+ Re2 27.Rhc1 g5 28.Rc6 Ne6 29.Kf1 Rb2 30.Rb6 (better 30.hg5!? Be7 31.Rb6 Ng5 32.Rh6=+) 30...gh4–/+ 31.Kg2 hg3 32.Kg3 Bg5 (32...Kg7 33.Rg1–/+) 33.Rb8? (better 33.Rd6=) 33...Kg7–+ 34.Ra8 h5 35.Rg1 h4 36.Kh3 Rf2 37.Ra5? (37.b6 Rf3 38.Kh2–+) 37...Rf3 38.Kg4 (38.Kh2 Kf6 39.Rg4 Rf2 40.Kh1 Be3 41.b6–+) 38...Kg6 39.b6 f5 0–1. Atotheking (1610) – kill2kill (1680), lichess.org, 2019.

5.a4 Nf6 6.e3 cb5 7.cb5 d5 8.Qc2 (8.Be5 Bf5+–) 8...d4 (8...Bd6 9.Nf3 Nbd7 10.Be2=) 9.ed4+= ed4 (9...e4 10.Nc3 Bf5 11.Rc1+=) 10.Nf3+– Be7 (10...Bd6 11.Be2+=) 11.Nd4 0–0 12.Be2 b6 13.0–0 Bc5 14.Nf3 Re8 15.d4 Bd6 16.Bd3 Bg4 (16...Bb7 17.Nbd2+–) 17.Nbd2 Nbd7 18.h3 Bh5 (18...Rc8 19.Qb1 Be6 20.Ng5+–) 19.Rae1 Bg6 (19...Rc8!? 20.Re8 Qe8+–) 20.Re8 Ne8 21.Bg6 fg6 (21...hg6 22.Rc1+–) 22.Ne4 Be7 23.Re1 Nef6?? (23...Rc8 24.Qb3 Kh8 25.Ba3+–) 24.Nf6 (better 24.Qb3 Kf8 25.Neg5+–) 24...Nf6 (24...gf6 25.Qc4 Kf8 26.Re6+–) 25.Ne5 Bd6?? (25...Bb4 26.Qc6 Qd5+–) 26.Qb3 Kh8 27.Nf7 (27.Nf7 Kg8 28.Nd8 Kh8 29.Nf7 Kg8 30.Nh6 Kh8 31.Qg8 Rg8 32.Nf7) 1–0. e4_e5_f4 (1720) – ismael0122 (1720), lichess.org, 2021.

5.a4 Nf6 6.e3 Be7 7.Nf3 e4 8.Nd4 d5 9.cd5 cd5 10.Be2 Bd6 11.0–0 h5 12.f4 Bg4 13.Nc3 Nbd7 14.h3 Be6?? (better 14...Be2 15.Nce2 0–0=) 15.f5+– (15.Ne6?! fe6 16.Rc1 Rc8+=) 15...Qc7 (15...Nc5 16.fe6 fe6+–) 16.fe6 Bh2 (16...Nc5 17.ef7 Qf7 18.Nf5+–) 17.Kh1 Ne5 (17...fe6 18.Ne6 Qb8 19.Ng7 Kd8 20.d3+–) 18.ef7 (18.Kh2?? Nf3 19.Kh1 Qh2) 18...Kf7 (18...Nf7 19.Ne6 Qg3 20.Nd5 Nd5 21.Ng7 Kd8 22.Qb3+–) 19.Nd5 (19.Kh2?? Nf3 20.Kh1 Qh2) 19...Qd6 20.Nf6 (20.Kh2?? Nf3 21.Kh1 Qh2) 20...gf6 21.Nf5 (21.Kh2?? Nf3 22.Kh1 Qh2) 21...Qc7 (21...Qd5 22.Kh2 h4 23.Ba3+–) 22.Rc1 (22.Kh2?? Nf3 23.Kh1 Qh2) 22...Qb8 (22...Qd7 23.Kh2 Qd5 24.Bh5 Ke6 25.Rc7+–) 23.Qb3 (23.Bh5 Kf8 24.Qb3 Nc4 25.Ba3 Qd6 26.Qc4 Rh5 27.Nd6 Kg7 28.Qf7 Kh6 29.Rf6 Kg5 30.Qg7 Kh4 31.Qg4) 23...Kg6 24.Ne7 (24.Kh2?? Nf3 25.Kh1 Qh2) 24…Kh6 (24...Kg7 25.Qe6 Rf8+–) 1–0. BeepBeepImAJeep (2715) – Yakov25 (2495), lichess.org, 2020.

5.a4 Nf6 6.Nf3 Be6 7.e3 d5 8.Ne5 dc4 9.Nc4 cb5 10.ab5 a4? (10...Be7!?+/–) 11.Nc3 Bb4 12.Na4 0–0 13.Be2 Bd5? (13...Ne4 14.0–0+/–) 14.0–0 Nbd7 15.d4 Qc7 16.Qb3 Bd6 17.h3 Bh2 18.Kh1 Ne4 19.Qd3 Bc4? 20.Qc4+– Qc4 21.Bc4 Bd6 22.Bd5 Ndf6 23.Bb7 Rab8 24.Bc6 Nd2 25.Rfc1 Nfe4 26.Be4 Ne4 27.Nc5 Nf2 28.Kg1 Bc5 29.Rc5 Nd3 30.Rc2 Rb5 31.Bc3 Re8? 32.Bd2 f5 33.Ra3 Nb2? 34.Kh2 Reb8 35.Rc7 R8b7? 36.Ra7 Ra7+= 37.Ra7 Nc4 38.Bc3 Ne3 39.Kg3 Nd5 40.Ba1 Rb3 41.Kh4 g6 42.g4 Ne3 43.gf5 Nf5 44.Kg5 1–0. brother – gustomina, kurnik, 2012.

5.a4 Nf6 6.g3 d5 7.bc6 Nc6 8.cd5 Qd5 9.Nf3 e4 10.Ng1 e3 11.Nf3 ef2 12.Kf2 Ng4 13.Kg2 Ne3 0–1. tyop (1785) – sahib65 (1790), playok.com, 2012.

5.Nc3 cb5 6.cb5 Nf6 7.e3 Be6 8.Be2 Be7 9.Nf3 Qc7 10.Ng5 Bc4 11.Nge4 (11.d3!? Be6 12.Rc1+–) 11...Ne4= 12.Ne4 Qb6?? (12...Be2 13.Qe2 0–0 14.Nc3+=) 13.a4 (better 13.Bc4 0–0 14.d4+–) 13...Be2 14.Qe2 Nd7 15.0–0 0–0 16.Qh5 Nf6 17.Nf6 Bf6 18.d4 ed4 19.ed4 (19.Rad1!?+=) 19...Bd4=+ 20.Bd4 Qd4 21.Rfd1 Qf6 (21...Qb6!?=+) 22.Qd5= Rfd8 (22...Rae8 23.Qb7 Re6 24.Qb6=) 23.Qb7+= Rab8 (23...d5 24.Qc6 Qc6 25.bc6=) 24.Qa6 Attacking the isolated pawn on d6 24...Ra8 25.Qc6 Qf4 26.Rdc1 d5 27.Ra2 d4 28.g3 Qe5 (28...Qg4!? 29.Kg2 Rac8=) 29.Rd2+= d3? (29...h6 30.Rd3+=) 30.Kf1 (30.Rd3 Rab8 31.Rd7 Re8+–) 30...Qd4 (30...Qf5 31.Rc3 Rab8 32.Kg2+=) 31.Qc4 (31.Rc3!? Rab8 32.Rcd3 Qa1 33.Rd1 Qd1 34.Rd1 Rd1 35.Kg2+–) 31...h6 32.Qd4 (32.Rc3 Qc4 33.Rc4 Ra7+=) 32...Rd4= 33.Rc3 Rad8 34.b6 Ra4 35.Rcd3 Rd3 36.Rd3 Rb4 37.Ra3 a4 38.b7 Rb7 39.Ra4 f6 40.Ra8 Kh7 41.Rd8 Re7 42.Rd6 Kg6 43.h4 Kf7 44.f3 g5 45.h5 Kg7 46.Kf2 f5 47.Rg6 Kh7 48.Rf6 (48.f4 gf4 49.gf4 Rf7+=) 48...Re5= 49.Rf7 Kg8 50.Rc7 f4 51.gf4 gf4 52.Rc6 (52.Rc4!?=) 52...Rh5–/+ 53.Rg6 Kh7 54.Rf6 Rg5 (54...Rh4!?–/+) 55.Rf4= h5 56.Rh4 1–0. Atotheking – shosho1911, lichess.org, 2019.

5.Nc3 Bd7 6.d4 (6.Nf3 Nf6+/–) 6...cb5 (6...Nf6 7.Nf3 e4 8.Nd2+=) 7.cb5 ed4 (7...Nf6 8.e4+/–) 8.Qd4 Qf6?? (better is 8...Be6+/–) 9.Qe4+– Qe5 10.Qb7 Bb5 11.Qa8 Be2 12.Qb8 Ke7 13.Be2 f5 14.Nf3 Qc5 15.Bb5 Nf6 16.Qb7 Ke6 17.Ng5 Ke5 18.Nd5 Qd4 19.f4# 1–0. marcosramos – pgonzalez, net–chess.com, 2007.

5.Nc3 Nf6!? =.

5.d4 ed4 6.Qd4 Nf6 7.Nf3 cb5 8.cb5 Bg4 9.e3 Bf3 10.gf3 Be7 11.Rg1 0–0 12.Bg2 Nbd7 13.f4 Rc8 14.Bb7 Rb8 15.Bc6 Nb6 16.Nc3 d5 17.Bd5 Nbd5 18.Nd5 Qd5 19.Qd5 Nd5 20.Rg7 Kh8 21.Rf7 Bf6 22.Bf6 Nf6 23.Rf8 Rf8 24.Rd1 Rb8 25.a4 Kg7 26.Rd6 Ne4 27.Ra6 Nc5 28.Ra5 Rb7 29.h4 Kf7 30.Ke2 Ke7 31.Kf3 Kd7 32.Ra8 Kd6 33.e4 Nd3 34.Rd8 Rd7 35.Rd7 Kd7 36.a5 Nc5 37.Ke3 Ke6 38.f5 Kd6 39.f4 Kc7 40.e5 Nb3 41.b6 Kb7 42.e6 Na5 43.f6 Nc6 44.e7 1–0. Machete99 – guest82, ICC, 2002.

5.d4 Nd7 6.e4 cb5 (6...Ngf6 7.Bd3=) 7.Nc3 (7.cb5 d5+=) 7...Ngf6 8.Nf3 (8.cb5 ed4 9.Qd4 Nc5+=) 8...b6 (8...b4 9.Nb5=+) 9.Nb5 (9.cb5 Bb7 10.Bd3 ed4 11.Nd4 Nc5+/–) 9...Bb7= 10.Bd3 h6 (better is 10...Ne4!? 11.Qe2 Ng5 12.Ng5 Qg5 13.Nc7 Kd8 14.Na8 Qg2=) 11.0–0 Bc6 (11...Ne4 12.Qe2 f5 13.de5 de5 14.Rad1+–) 12.c5 (12.de5 de5 13.Ne5 Ne5 14.Be5 Bb5 15.cb5+–) 12...ed4? (better is 12...dc5 13.de5 Ne4+/–) 13.cd6+– (13.Nfd4?! Bb5 14.Bb5 bc5+/–; 13.Nbd4?! Be4 14.cd6 Bd3 15.Qd3 Bd6+/–) 13...Bb5 14.Bb5 Ne4 15.Re1 f5 16.Ne5 Bd6 17.Qh5 (17.Qh5 g6 18.Qg6 Ke7 19.Qf7#) 1–0. b4_player – Tlucent, gamecolony.com, 2007.

5.d4 e4 6.g3 d5 7.e3 Nf6 8.Nc3 Bb4 9.a3 Bc3 10.Bc3 Bd7 11.a4 0–0 12.Qb3 Re8 13.Nh3 h6 14.cd5 cd5 15.Nf4 Bg4 16.Bg2 g5 17.Ne2 b6 18.h4 Qd7 19.Qc2 Qf5 20.f4 Nbd7 21.hg5 hg5 22.Kf2 Nh5 23.Bb2 Kg7 24.Qb3 Rac8 25.Rhe1 Rc3 1–0. White – Marshall, email CTON 1996–97.

5.d4 f6 6.e3 Bf5 7.Bd3 Qd7 (7...e4 8.Be2=) 8.Ne2 (8.Qh5 g6 9.Bf5 Qf5 10.Qf5 gf5+=) 8...Nh6 (8...e4 9.bc6 bc6 10.Bc2+=) 9.0–0 (9.e4 Bg6+/–) 9...Be7 10.Nbc3 0–0 11.Rb1 Bd3 12.Qd3 f5 13.f3 Bf6 14.Rfd1 Qc7 15.bc6 bc6 16.de5 de5 17.Nd5 Qd8 18.Nf6 Qf6 19.f4 e4 20.Qa3 Qf7+= 21.Rd6 Nd7 22.Rc6 Ng4 23.Nd4 Rfc8 24.Rc8 Rc8 25.h3 Nh6 26.Qa5 Rc4? 27.Qd8 Nf8 28.Ba3 (28.Ba3 Rc3 29.Bd6 Re3 30.Rb8+–) 1–0. Woelfelschneider,Peter – Tarufaru, 2009.

5.e3 cb5 6.cb5 Nf6 7.a4 Be7 8.Nf3 0–0 9.d4 Nbd7 10.de5 Ne5 (10...de5!? 11.Ne5 Bb4 12.Ke2 Re8=) 11.Ne5+/– (11.Be5 de5 12.Qd8 Rd8 13.Ne5 Bb4 14.Ke2 Bf5=+) 11...de5 12.Qd8 Rd8 13.Be5 Bb4 14.Bc3 Ne4 15.Bb4 ab4 16.f3 Nf6 (16...Nc5 17.a5=) 17.Bc4 Nd5 18.Bd5 Rd5+= 19.0–0 Bd7 20.e4+= Rd3 21.Kf2 Bb5= 22.Rc1 g6 23.Ra2 b3 24.Rd2 Ra4 25.Rd3 Bd3 26.Nd2? b2 27.Rc3 b1Q 28.Nb1 Bb1 29.Rb3 Ra2 30.Kg3 Ra1 31.Rb7 Kg7 32.Rc7 Ra3 33.e5 Re3 34.Kf4 Re1 35.g4 h6 36.h4 Kf8 37.Rc8 Ke7 38.Rc7 Ke6 39.Rc6 Ke7 40.Rc7 Kf8?? 41.Rc8= Kg7 42.Rc7 h5 43.gh5 gh5 44.Rc5 Kg6 45.Kg3 Bf5 46.f4 Rg1 47.Kf2 Rg4 48.Kf3 Rh4 49.Rc6 Kg7 50.Rf6 Be6 51.f5 Bd5 52.Kg3 Rg4 53.Kh3 Rg5 54.e6 fe6 55.Re6 Be6 56.fe6 Re5 57.Kh4 Re6 58.Kh5 Rg6 59.Kh4 Kf6 60.Kh5 Rg1 61.Kh4 Rg8 62.Kh3 Kf5 63.Kh4 Rg7 64.Kh3 Kf4 65.Kh2 Kf3 66.Kh1 Kf2 67.Kh2 Rh7# 0–1. bluepiramid2 – luizlima45, kurnik, 2011.

4.c4 Nd7

5.a4 Ngf6 6.Nf3 g6 (6...Be7 7.d4=+) 7.g3 (7.d4 Bg7=) 7...Bg7 8.Bg2 0–0 9.0–0 Qe7 10.d3 Re8 11.Nbd2 Nc5 12.Nb3 Nfd7 13.Nfd2 =. Grund,Karl – Dozbaba, corr ICCF EU–M–318 (year?).

5.a4 g6 6.e3 Bg7 7.Nf3 Nh6 8.Be2 0–0 9.0–0 f5 10.d4 Nf7 11.de5 Nde5 12.Nd4 c5 13.bc6 bc6 14.Nc3 c5 (14...Qe8 15.Qc2=) 15.Ndb5+= Bb7 16.Nd5 Nc4? (better 16...Rb8+–) 17.Bg7+– (17.Bc4?! Bb2 18.Ra2 Be5=) 17...Ne3 (17...Bd5 A) 18.Qd5?! Nb6 19.Qc6 Rc8+= (worse 19...Kg7 20.Nc7 Qb8 21.Na8 Na8 22.Rfb1+–); B) 18.Bf8 Nb6 19.Bd6 Nd6 20.Nd6 Qd6 21.Rb1+–) 18.Ne3 (better 18.fe3!? Kg7 19.Ndc7 Qe7+–) 18...Kg7 19.Bf3 d5 (19...Rb8+–) 20.Bd5 Bd5 21.Qd5 (21.Nd5 Rc8+–) 21...Qd5 (21...f4 22.Qd8 Nd8 23.Nc7+–) 22.Nd5 Rad8 23.Nf4 Ng5 (23...Kf6 24.Nc7 Ng5 25.Rfc1+–) 24.h4 (24.h4 Ne4 25.Ne6 Kf7 26.Nf8 Kf8 27.Rfd1+–) 1–0. BeepBeepImAJeep (2565) – tabak (2080), lichess.org, 2016.

5.Nc3 f5 6.e3 Ngf6 7.Nf3 Be7 8.Be2 0–0 9.0–0 e4 10.Nd4 Nc5 11.Qc2 Qe8 12.h3 Qg6 last book move 13.Rfe1 f4 14.ef4 Bh3 15.g4?? (15.Bf3 ef3 16.Qg6 hg6 17.gh3= (worse 17.Re7 Bg2 18.Ba3 Rf7–/+)) 15...Ng4–+ 16.f5 Rf5 17.Nf5 (17.Qd1 Nf2 18.Bg4 Nd1 19.Kh2 Qg4 20.Rg1 Rf2 21.Kh1 Bg2 22.Rg2 Qg2) 17...Ne3 (17...Nf2 18.Kf2 Qg2 19.Ke3 Bg5 20.Kd4 Qf2 21.Ne3 Bf6 22.Kd5 Be6) 18.Ng3–+ Nc2 19.Bh5 (19.Nd5 Bh4 20.Kh2 Bg4 21.Bg4 Qg4–+) 19...Qg5 (19...Qh6!? 20.b6 Bh4 21.Nce4 Na1 22.Bf3–+) 20.Nce4 Ne4 21.Re4 Na1 22.Ba1 Bf6 23.Bf6 Qf6 24.Re3 Rf8 25.Bf3 Qf3 26.Rf3 Rf3 27.Ne2 Ra3 28.Nc1 Be6 29.d3 Bf5 30.d4 Bb1 0–1. Silent Move (2115) – serigado (1855), redhotpawn.com, 2012.

5.Nc3 Ngf6 6.e4 g6 7.Nf3 Bg7 8.Be2 0–0 9.Qc2 Nc5 10.h3 Nh5 11.a4 Nf4 12.Bf1 f5 13.d3 Be6 14.Nd5 fe4 15.de4 c6 16.Nf4 Rf4 17.Bd3 Nd3 18.Qd3 d5 19.cd5 cd5 20.Rd1 Re4 21.Qe4 de4 22.Rd8 Rd8 23.Nd2 Bd5 24.f3 (24.Rh2 Rc8 25.Kd1 Bc4–+) 24...ef3 25.gf3 Kf7 26.Rh2 Ke6 27.Ne4 Rc8 28.Rd2? (better is 28.Ng5!? Kf5 29.Rd2–/+) 28...Be4–+ 29.fe4 Rc4 0–1. Dyett,Maxwell J – Osbun,Erik D, CCLA, 1986.

5.Nc3 Ngf6 6.Nf3 g6 7.d3 Bg7 8.g3 b6 (8...0–0 9.Bg2=) 9.Bg2 Bb7 10.0–0 0–0 11.Qc2 Nc5 Black intends e4 12.Rad1 Ne6 13.Ng5 Bg2 14.Ne6 fe6 15.Kg2 e4? (better is 15...Qd7!?=) 16.Ne4 Ne4 17.de4 Bb2 18.Qb2 e5 19.Qd2 Qe7 20.Qd5 Kg7 21.h4 Rae8 22.Rd3 h5 23.Rf3 Rf3 24.Kf3 g5 25.Rh1 Rf8 26.Kg2 g4 27.Rf1 Rf6 28.a4 Rf8 29.f3 Rf7 30.Rf2 Rf6 31.Qd2 Rf8? (31...gf3!? 32.Rf3 Rg6+–) 32.Qe3+– Qf6? (better is 32...gf3 33.Rf3 Rh8+–) 33.c5 (better is 33.fg4 Qf2 34.Qf2 Rf2 35.Kf2 hg4 36.Ke3+–) 33...bc5 (33...dc5 34.fg4 Qf2 35.Qf2 Rf2 36.Kf2 hg4+–) 34.Qd2 gf3 35.ef3 Ra8 36.Qd5 Rf8 37.Qb7 Rf7 38.Qa7 Qe6 39.Qa5 Qb3 40.Qd2 Qa4 41.Qg5 Kf8 42.Qd8 (42.b6 cb6 43.Rd2 Rd7+/–) 42...Kg7 43.b6 cb6 44.Qg5 (44.Qb6?! Rf6=) 44...Kf8 45.Rd2 Qd7? (45...Qb3 46.Qh6 Kg8 47.Qg6 Kh8 48.Qh5 Rh7 49.Qe8 Qg8+–) 46.Ra2+– Qc8 (46...Rg7 47.Ra8 Kf7 48.Qh5 Ke7 49.Qh6+–) 47.Qh6 (47.Qh5?! Kg7+=) 47...Kg8 48.Qd6 c4 49.Qe5 Qd8 50.Qh5 c3 51.Qg6 Rg7 52.Qe6 Kh7 53.Qf5 Kg8 54.e5 Rd7 (54...Qd5 55.Ra4 Kh8 56.Qc8 Qg8 57.Qg8 (57.Qc3?! Rg3 58.Kf2 Rg7+–) 57...Rg8 58.Rc4+–) 55.Ra4 (better is 55.e6 Rd2 56.Rd2 cd2 (56...Qd2 57.Kh3 Qd8 58.Qf7 Kh8 59.e7 Qd7 60.g4+–) 57.Qf7 Kh8+–) 55...b5 (55...Qe8 56.Rc4 b5 57.Rc3 b4+–) 56.Ra6 c2 57.Rg6 Rg7 58.Qc2 Qe8 59.Qb3 Kh7 60.Re6 Re7 (60...Qd7 61.Rb6 Qf5 62.Rb5 Re7+–) 61.Re7 Qe7 62.Qb5 Qe6 63.Qd3 (63.Qd3 Kg7 64.Qd6+–) 1–0. forsetinn (2400) – bla_ner (1915), gameknot.com, 2015.

5.d4 Ngf6 =.

5.e3 b6 6.d4 Bb7 7.Nd2 ed4 (7...Ngf6 8.Ngf3=) 8.Bd4 Ngf6 9.Ngf3 c5 (9...Nc5 10.Be2=) 10.Bb2 (10.bc6 Bc6 11.Bd3 Rc8+=) 10...Be7 11.a4 (11.Bd3 d5+=) 11...0–0 (11...Qc7 12.Bd3=) 12.Bd3 d5 (12...Ne5 13.Be2=) 13.0–0+= Ne4? (13...Qc7 14.cd5 Bd5 15.Qc2+=) 14.Qc2 (14.cd5 Nd2 15.Nd2 f5+–) 14...Nd2 (14...Bf6 15.Rad1 (15.Ne4? de4 16.Be4 Be4 17.Qe4 Bb2–+; 15.Be4?! de4 16.Ne1 Bb2 17.Qb2 Qg5=+) 15...Bb2 16.Qb2 Nd2 17.Nd2=) 15.Qd2 (better 15.Bh7!? Kh8 16.Nd2+–) 15...dc4= 16.Bc4 (16.Be2 Bf6=) 16...Bf3=+ 17.gf3 Bf6 (17...Ne5 18.Qe2 Nc4 19.Qc4=+) 18.Rfb1 (18.Bf6!? Nf6 19.Rfd1=) 18...Bb2 19.Rb2 Ne5 20.Bd5 Kh8?? (better 20...Ra7 21.Rd1 Rd7–/+) 21.f4+– (21.Ba8 Qa8 22.Qc3 Nf3 23.Kf1 Nh2 24.Kg1 Nf3 25.Kf1 Nd4–+) 21...Ng6 22.Ba8 Qa8 23.Qd6 Qf3 (23...Rc8 24.Rd2 (24.Qb6?! Nh4 25.f3 Nf3 26.Kf2 Nh4=) 24...Nh4 25.Rd5 Nf3 26.Kg2+–) 24.Qb6+– Nh4 25.Kf1?? (better 25.Qc6 Qh3 26.f3 Nf3 27.Kh1+–) 25...Qh1–+ 26.Ke2 Qa1 27.Rc2 Qa4 28.Rc5? (28.Qc5 Kg8 29.Qc4–+) 28...Qa2 29.Kd3 Nf5! 30.e4 (30.Rf5 Qb1 Double attack (30...Qb1 Decoy)) 30...Qb1 31.Kc4 (31.Kd2 Qe4 32.Qc7 Re8–+) 31...Qb4 (31...Qc2 32.Kd5 Qd3 33.Ke5 f6 34.Qf6 gf6 35.Ke6 Ng7 36.Ke7 Qd8) 32.Kd3–+ Ne7 (better 32...Qd4 33.Kc2 Qe4 34.Kb2 Qb4 35.Ka2 Qd2 36.Ka1 Nd4–+) 33.Qd6 Qb1 (33...Ng6!? 34.f5 Nf4 35.Ke3 Ng2 36.Kf3 Ne1 37.Ke3–+) 34.Ke3 Qb3 (34...Ng6!? 35.f5 Qe1 36.Kf3–+) 35.Ke2 Qb2 36.Kf1?? (36.Ke3 Qa3 37.Kd2 Ng6–+) 36...Qf6 (better 36...Qb1 37.Kg2 Qe4 38.f3 Qe2 39.Kg3 Ng6–+) 37.e5 (37.Qf6 gf6 38.Rc7 Nc8–/+) 37...Qd6 (37...Qh4 38.b6 Ng6 39.b7 Qh3 40.Ke1=) 38.ed6–/+ Ng6?? (38...Nc8 39.Rc6 Rd8=+) 39.d7+– Ne7 (39...a4 40.Rc8 a3 41.Rf8 Nf8 42.d8Q+–) 40.b6 (better 40.Re5 Rg8+–) 40...a4 (40...g6 41.b7 (41.Ra5?! Rd8=) 41...Kg7 42.Rc8+– (42.Ra5?! Nc6 43.Rc5 Nb8+–)) 41.b7 a3 (41...Rg8 42.Rc8 Nc8 43.dc8Q h6+–) 42.Rc8 Nc8 43.dc8Q h6 44.Qf8 Kh7 45.Qa8 (45.Qa8 a2 46.Qa2 Kg6 47.Qb1 Kh5 48.Qf5 g5 49.fg5 f6 50.g6 Kh4 51.b8Q h5 52.Qb4; 45.Qf7 a2 46.Qf5 g6 47.Qd7 Kg8 48.b8Q) 1–0. OnlyPolishOpening (1770) – JuancarlosUVM, lichess.org, 2020.

5.e3 f5 6.Nf3 Ngf6 7.Nc3 h6 8.Be2+= Be7 9.0–0 0–0+= 10.d4 b6 11.Nh4+/– Nb8 12.Ng6 Kh7 13.Nf8 Qf8 14.Qc2 e4 15.f3 Bb7 16.fe4 Be4 17.Ne4 Ne4 18.Bf3 Bg5 19.Be4 Be3 20.Kh1 (20.Kh1 Kh8 21.Ba8+–) 1–0. pierre – mikel44, internet, 2008.

5.e3 Ngf6 6.d4 =.

5.e4 Ngf6=+ 6.Nc3 b6 (6...Nc5 7.d4 ed4 8.Qd4=+) 7.d3 (7.Nf3 Bb7=) 7...Be7 8.Be2 Bb7 (8...0–0 9.Nf3=) 9.Nf3 h6 (9...0–0 10.0–0=) 10.0–0+= Nc5 (10...0–0 11.Nd5+=) 11.a4 (11.Nd5 0–0+=) 11...g5 (11...0–0 12.Qc2=) 12.h3 (12.Nd5 Qd7+=) 12...Bc8 (12...Qd7 13.Nd5=) 13.Nh2 (13.d4 ed4 14.Nd4 Bb7+/– (14...Nfe4?? 15.Ne4 Ne4 16.Nc6+–)) 13...Be6 14.Nd5 Qd7 15.Nf6 (15.d4 Nce4 16.de5 de5 17.Be5 0–0–0+=) 15...Bf6= 16.Bg4 Bg4 (16...0–0–0 17.Ra3=) 17.Ng4+= Be7 (17...Bg7 18.Ne3+=) 18.Ne3 (18.d4 ed4 19.Qd4 Rh7+/–) 18...h5 (18...0–0–0 19.Nf5+=) 19.Nd5 (19.d4!? ed4 20.Qd4+/–) 19...g4 (19...0–0–0 20.Re1+=) 20.hg4 hg4= 21.Ne7 Ke7 22.g3 Qe6=+ 23.Bc1 Qg6 24.Kg2=+ Rh3 25.f3 Rah8 26.Rg1 Rh2–+ 27.Kf1 Rh1 28.fg4? R8h2?? 29.Qf3=+ Rg1 30.Kg1 Rh8 31.g5 Rf8 32.g4 f6 33.Qe2 fg5 34.Be3 (34.Qe3 Ke8 35.Ra2 Nb3–/+) ½–½. Wilke,Hans_Joachim – Serowy,Reinhold, 14sen.Brandenburg op, 2005.

5.Nf3 Ngf6 6.e3 Be7 7.Nc3 0–0 8.Be2 h6 9.0–0 c6 10.a4 Re8 11.Qc2 Bf8 Black prepares the advance e4 12.d3 Qe7 13.Rfd1 d5 Black prepares the advance e4 (13...Nc5!?+=) 14.d4+/– e4 15.Nd2 Qe6 16.Ba3 White plans c5 16...Ba3 17.Ra3 Nf8 18.c5 Qf5 19.Nf1 Qg5 20.Ng3 (20.Rb3!?+=) 20...h5+= 21.Bf1 h4 22.Nh1 h3 23.Ng3 hg2 24.Bg2 Qh4 25.f3? (better is 25.Rb3+=) 25...ef3–+ 26.Bf3 Re3 27.Qf2 Re8 (27...Qg5 28.Re1 Re1 29.Qe1–+) 28.Rb3 Bg4 29.bc6 bc6 30.Rb6 Bf3 31.Qf3 Ng4 32.Nf1 Re6 33.Qg3 Qg3 34.hg3 Ng6 (34...Nh7 35.Nh2 Nhf6 36.Rd3–+) 35.Rdb1 (better is 35.Kg2–/+) 35...Ne3?? (35...Ne7!? 36.Rd1–+) 36.Rb8 (better is 36.Rc6! Rc6 37.Ne3=) 36...Rb8–/+ 37.Rb8 Nf8 38.Ra8 Nc4 39.Kg2 g6 40.Kf2 Kg7 41.Ra6 Rf6 42.Ke2?? (42.Ke1 g5–/+) 42...g5 (better is 42...Ne6 43.Nd2 Nd4 44.Kd3 Ne6–+) 43.Nd2 (better is 43.Ne3!?–/+) 43...Re6–+ 44.Kd1 Ne3 45.Kc1 Nf5 46.Nb3 Re3 (46...g4 47.Rb6 Ng3 48.Na5–+) 47.Kd2 (47.Kb2 Rg3 48.Rc6 Rg2 49.Kb1–+) 47...Rg3–/+ 48.Rc6 Ne6 49.Ra6? (better is 49.Re6 fe6 50.c6–/+) 49...Nfd4 (better is 49...Nf4 50.Nc1 Rg2 (50...Nd4?! 51.Nb5 Nf5 52.Nd6 Rg2 53.Kc3 d4 54.Kb3–+) 51.Kd1 Rb2–+) 50.Nd4= Nd4 51.c6 Nb3 52.Kc2 d4 53.Nd1 Nc5? (better is 53...Na1 54.Kb2 Rb3 55.Ka2 Rb4+/–) 54.c7+– Na6 55.c8Q Nb4 56.Kd2 Rg2 57.Ke1 Nd3 58.Kf1 Rd2 59.Qe8?? (better is 59.Qg4 Kg6 60.Qe4 Kh5 61.Qd4 Rd1 62.Ke2 Re1 63.Kd2+–) 59...f6 (better is 59...Rd1!? 60.Kg2 Nf4 61.Kf3 Rf1 62.Kg3 Ra1+=) 60.Qe7 Kg6 61.Qe4 Kh5 62.Qd4 Rd1 63.Ke2 Re1 64.Kd2 Re5?? (better is 64...Ne5 65.Qd8 Nf3 66.Kc2 Re2 67.Kc3 Re3 68.Kb2 Re2 69.Kc3 Re3 70.Kb2 Re2 71.Kc3=) 65.Kd3+– Kg6 66.Kc3 Kh5 67.Qd6 Kg6 68.Qd3 Kh5 69.Qd6 Kg6 70.Qd3 Kh5 71.Qd6?? (better is 71.Qh3 Kg6 72.Qc8+–) 71...Kg6= ½–½. Lin,Chenxi – Lebel Arias,J (1755), ch–Francophonie, 2015.

5.e3 g6

6.Nc3 Bg7 7.Nf3 Ngf6 8.Be2 0–0 9.d4 Re8 10.0–0 ed4 11.Nd4 Nc5 12.Bf3 Bd7 13.Nb3 Nb3 14.ab3 Qc8 15.b6 cb6 16.Qd6 Ng4 (16...Bc6 17.Qf4+=) 17.Bg4 (< 17.Qb6 Ra6 18.Qb7 Qb7 19.Bb7 Rb6=+) 17...Bg4 18.Qb6 Ra6 19.Qb5 Re5 20.Qa4 (20.Nd5!? Rd5 21.cd5 Bb2 22.Ra5=) 20…Bf3!=+ (21.Ne4 Be4 22.Be5 Be5–/+) 0–1. Zhukov – Makarevich, corr, 1972.

6.d4 Ngf6 =.

6.Nf3 Bg7

7.Nc3 e4 8.Nd4 Ngf6 9.d3 =.

7.Nc3 f5 8.d4 e4 9.Nd2 Ne7 10.Be2 0–0 11.0–0 Nf6 12.Rb1 b6 13.Qe1 Bb7 14.d5 Bc8 15.f3 ef3 16.Nf3 Nd7 17.Na4 Bb2 18.Nb2 Nc5 19.Nd3 Bd7 20.Nc5 dc5 21.Ne5 Nc8 22.e4 Re8 23.Qg3 Nd6+= 24.Bd3 Re5?? 25.Qe5+– fe4 26.Be4 Nc4 27.Qg3 Qe7 28.Rbe1 Qd6 29.Qh4 Bb5 30.Rf7!! (30...h5 31.Rf6+–) 1–0. pcmvr (2645) – papote (2200), net–chess.com, 2006.

7.Nc3 Ngf6 8.Be2 0–0 9.0–0 e4 10.Nd4 Nc5 11.Nb3 (11.f3 Re8+=) 11...Nfd7 12.Qc2 b6 (12...a4 13.Nc5 (13.Ne4? Bb2 14.Nbc5 Nc5–+) 13...Nc5 14.Nd5=) 13.Rab1 (13.Nd4 f5+=) 13...Bb7 (13...Qh4 14.Nd5 Bb2 15.Rb2+=) 14.Ba3 (14.Nc5 Nc5 15.f3 f5+=) 14...Be5 (14...Qh4 15.Nc5 Nc5 16.Nd5=) 15.Nc5 Nc5 (15...dc5 16.Ne4 Bh2 17.Kh2 Qh4 18.Kg1 Be4 19.d3 Bg2 20.Kg2 Qg5 21.Kh3 Qh6 22.Kg3 Qg5 23.Kh2 Qh4 24.Kg1 Qg5 25.Kh1 Qh4 26.Kg1 Qg5 27.Kh2 Qh4 28.Kg1=) 16.Bc5+= bc5 17.Ne4 Be4 (better is 17...Bh2!? 18.Kh2 Qh4 19.Kg1 Be4+=) 18.Qe4+/– Re8 19.f4 Bg7 20.Qc2 f5 (20...Qh4 21.Bf3 Ra7 22.f5+–) 21.a4 (21.Bf3 Ra7+–) 21...Re7 (21...Rb8 22.Bf3+/–) 22.Bf3+– Rb8 23.Bc6 (23.Bd5 Kh8+–) 23...Qf8 24.Rfe1 (24.Qd3 Qf6+–) 24...Qf6+/– 25.Rb3 (25.Bd5 Kh8+/–) 25...g5 (25...h6!?+/–) 26.g3 (26...gf4 27.Bd5 Kh8 28.gf4+/–; 26.fg5 Qg5 27.Rf1 Re5+–) 1–0. Nemec,Zdenek – Grecny,Karol, corr CSLA, 1981.

7.d4 Ne7 8.Be2 0–0 9.0–0 h6 10.Qc2 ed4 11.Bd4 Nc5 12.Nc3 Nf5 13.Bg7 Ng7 14.Qd2 b6 15.Nd4 Bb7 16.Bf3 Bf3 17.Nf3 f5 18.Nd5 Rf7 19.Rad1 Nh5 20.Qc2 Qe8 21.Rd4 Nf6 22.Rh4 h5 23.Rb1 Nce4 24.Rh3 Rc8 25.Rb2 Ng4 26.Qb1 Ne5 27.Ne5 Qe5 28.Qc1 Re8 29.Re2 Nc5 30.f3 Kg7 31.Qd2 Na4 ½–½. pcmvr (2695) – papote (2380), net–chess.com, 2006.

7.d4 Ngf6 =.

4.c4 Be6

5.a4 Bc4 6.d3 Be6 7.Nf3 f5 8.e3 h6 9.Be2 Nf6 10.0–0 Be7 11.Nbd2 0–0 12.e4 fe4 13.de4 Nbd7 14.Rc1 Nc5 15.Ba3 Nfe4 16.Ne4 Ne4 17.Qc2 Nc5 18.Ne5 Bf5 19.Qc4 Be6 20.Qc2 Bf5 21.Qc4 Be6 22.Qc2 ½–½. rom49szachy – szefuncio1981, kurnik, 2012.

5.e3 Nd7 6.Nf3 Ngf6 7.Be2 Be7 8.d4 (8.0–0 0–0=) 8...e4 9.Nfd2 c6 (9...d5 10.cd5 Bd5 11.0–0+=) 10.Nc3+= d5 11.c5 0–0 12.Qc2 (12.b6 Bf5+=) 12...Ne8 (12...cb5 13.Nb5 Qc8 14.0–0=) 13.b6 f5 14.g3 (14.0–0 Bh4=) 14...g5 Black prepares f4 (14...Nef6 15.0–0=) 15.0–0–0+= Ng7 16.Rdg1 (16.f4 Bf7+=) 16...Bf7 (16...Bf6 17.h3+=) 17.a4 (17.Rf1 Bf6+=) 17...Bg6 (17...Bh5 18.Bh5 Nh5 19.h3+=) 18.Nd1 (18.h3 Bf6+=) 18...f4 (18...Bf6 19.h3=) 19.gf4 gf4 20.Nb3 (20.Bf1 Nf5+=) 20...Nf6 21.Qd2 Nfh5 22.Bg4 Bg5 23.Bc3 Qe7 24.Nb2 Bh4 25.Rg2 Rf7 26.Nd1 Nf6 27.Kb2 Raf8 28.Na5 Ng4–/+ 29.Rg4 Bh5 30.Rf4+= Rf4 31.ef4 Ne6 32.Rg1 Kh8 33.Qe3 Nf4 34.Nb3? Nd3 35.Ka3 Nf2 36.Nf2 Bf2 37.Qg5 Qg5 38.Rg5 Be2 39.Nd2 h6 40.Rg6 Kh7 41.Re6 Ba6 42.Kb2 e3–+ 43.Nb3 Rg8 44.Na5–/+ Rg6 45.Re8 Rg2 46.Kb3 Rg8 47.Re6 Rg6 48.Re8 Rg8 49.Re6 ½–½. Morriss,Pete (1980) – Gamboa,Anibal (2170), TCh–FIN SM, 2012.

5.e3 Be7 6.d4 =.

5.e3 f5 6.Nc3 Nf6 7.d4 (7.Nf3 Be7=) 7...ed4 8.ed4 d5 9.c5 (9.Qe2 Qd7=) 9...c6 (9...Be7 10.Qe2 Qd7 11.Nf3=) 10.a4 (10.Nge2 Nbd7+=) 10...Be7= 11.Qe2 Bd7 12.Nf3 0–0 13.Ne5 Ne4 14.f3 Ng5 (14...Nc3 15.Bc3 Bf6 16.Kf2=) 15.Nd1 (15.Kf2 Nf7 16.Rb1 Bc5 17.dc5 Qh4 18.g3 Qd4 19.Kg2 Qe5 20.Qe5 Ne5 21.Nd5 cd5 22.Be5 Rc8+–) 15...Bf6 16.f4 (16.Kf2 f4=) 16...Ne4 17.Nc3 (17.Nf2 Re8=) 17...Be5 18.fe5 Be6 19.g3 (19.Qf3 b6=) 19...Nd7 20.Qe3 (20.Rb1 Qe7=) 20...Qe8 21.Be2+= Qg6 22.Rf1 h6 23.Bd3 Qh5 24.Qe2 Qg6 25.Be4 fe4=+ ½–½. Krickemeyer,Horst – Luebbers,Henning, 7sen.WttgEM/Ellwangen, 1995.

5.e3 Nf6 (--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5 5.c4 Be6).

4.c4 f5

5.d4 ed4 6.Bd4 Nf6 7.Nc3 c6 (7...Be7 8.Nd5=) 8.Nh3 (8.Nf3 Be6+=) 8...Be6 (8...Be7 9.Nf4=) 9.Qb3 c5 10.Bf6 Qf6 11.e3 (11.Rd1 Be7=) 11...g5 12.0–0–0 Nd7 13.f4 (13.Be2 a4 14.Na4 Bg7 15.Rd6 Qa1 16.Kd2 Qh1 17.Re6 Kf8+/–) 13...h6 14.g3 (14.Be2 g4 15.Nf2 a4=) 14...Nb6 15.Na4 Na4 16.Qa4 g4 17.Nf2 Qc3 18.Qc2 Qc2 (18...Qe3!? 19.Kb1 Be7–/+) 19.Kc2= b6 (19...Rd8 20.e4 fe4 21.Ne4+=) 20.Bg2 Rd8 (20...Ra7 21.Bd5 Re7 22.Rhe1+=) 21.Bd5+/– Bc8 22.h3 gh3 23.Rh3 Bg7 24.Rh5 Ke7 25.Rg1 (25.Re1 Rhe8+/–) 25...Be6 26.g4 Bd5= 27.cd5 fg4 28.Ng4 Rh7 29.Rgh1 Rdh8 30.e4 Rf8 31.f5 Rfh8 32.Ne3+/– Kd7 33.Nc4 Kc7 34.Rg1 Rf8 35.Rg6 Rf6 36.Ne3 Kd7 37.a4 Ke7 38.Nc4+– Rg6 39.fg6 Rh8 40.Rf5 Bf6 41.Nd6! Kd6? 42.Rf6 Ke5 43.Re6 Kd4 44.d6 (44...Rd8 45.g7+–) 1–0. Roczniak,Jan – Anczakowski, Poland, 1990.

4.c4 Bf5

5.Nc3 Nf6 6.d3 h6 (6...Be6 7.Nf3=) 7.g3 (7.e4 Bg4 8.Be2 Be2 9.Nge2 Be7+=) 7...Nbd7 8.Bg2 Ra7 9.Na4 Be7 10.Qd2 0–0 11.e4 Bh7 12.Bc3 c6 13.b6 (13.bc6 bc6 14.f4 Re8=) 13...Ra6=+ 14.Rb1 (14.Nh3 Re8=+) 14...Nb6–/+ 15.Nb6 Rb6 16.Rb6 Qb6 17.Ba5 Qb1 (17...Qa6 18.Bb4–/+) 18.Ke2=+ Be4 19.Nh3 (worse 19.de4 Ne4 20.Qe3 Qa2 21.Kf1 f5 (21...Qa5?! 22.Be4 d5 23.cd5=+; 21...Qc4?! 22.Ne2 f5 23.f3–+) 22.Be4 fe4–+ (22...Qa5?! 23.Bc2=)) 19...Bd3 20.Qd3 Qa2 21.Bd2 Ra8 22.Rc1 Qb2 (22...d5 23.cd5 cd5 24.Qb5=) 23.Rc2 (better 23.Rb1!? Qa2 24.Qb3+–) 23...Qb1 24.Qc3 Ra2 25.Ra2 Qa2 26.Qb4 Qa6 27.Bf3 (better 27.Kd1!?=) 27...Nd5–/+ 28.Bd5 cd5 29.Qb5 (better 29.f4–/+) 29...Qb5?? (better 29...dc4 30.Qa6 ba6–+) 30.cb5=+ f5 31.Bc3 d4 32.Bb4 Kf7 33.f3 d5 (33...Ke6 34.Nf2–/+) 34.Ba5?? (better 34.Be7 Ke7 35.Kd3+=) 34...Ke6 35.Kd3 (35.Bb6 Bf6–/+) 35...Bc5–+ 36.Nf2 Kd6 37.Nd1 (37.Bd2 Kc7 38.Ba5 Kd7–/+) 37...b6 Black fights for the Initiative 38.Bd2 e4 39.fe4 de4 40.Ke2 (40.Kc4–+) 40...Kd5 41.Nb2 d3 42.Kd1 (42.Nd3 ed3 43.Kd3 Bg1–+) 42...Bd4 43.Bc1 Bf2 (43...g5 44.Kd2–+) 44.Bf4 Kc5 45.Kd2 Kb5 46.Be5 (46.Nd1 Bd4 47.Ne3 Be348.Be3 g5–+) 46...g5 47.Bg7 h5 48.Nd1 Bg1 49.h3 f4 (better 49...Bh2!? 50.g4 Bf4 51.Ke1 hg4 52.hg4 fg4 53.Nc3 Kc4 54.Ne4 b5–+) 50.gf4 gf4 51.Nc3 (better 51.Bh6!? Kc6 52.Bf4–/+) 51...Kc4–+ 52.Ne4 Be3 53.Ke1 f3 54.Be5?? (better 54.Bc3–+) 54...Kd5 55.Nf6 (55.Ng3 Ke5 56.Nh1–+) 55...Ke5 56.Nh5 f2 (56...f2 57.Kf1 d2 58.Ng3 d1Q 59.Kg2 Qg1 60.Kf3 f1Q 61.Nf1 Qf2 62.Kg4 Qf4 63.Kh5 Qg5) 0–1. petrobbo (2035) – jonmt (2105), ChessWorld.net, 2014.

5.e3 Nd7 (5...Nf6 6.Nf3=) 6.Nf3 Be7 7.a4 Ngf6 8.d4 e4 9.Nh4 Bg6 (9...Bg4 10.Be2 Be2 11.Qe2=) 10.Ng6 hg6 11.Nd2 c6 12.Qb3 d5 13.cd5 cd5 14.Ba3 0–0 (14...Ba3 15.Qa3 Ng4 16.Qd6=) 15.Be7 Qe7 16.Be2 Nb6 17.0–0 Rfc8 18.Rfc1 Qd7 19.h3 Rc1 20.Rc1 Rc8 21.Rc8 Qc8 22.Qd1 Qc3 23.Nb1 Qb4=+ 24.Qc2 Na4 25.Nd2 Qb2 26.Qb2 Nb2–/+ 27.Kf1 Nd7 28.Ke1 Nb6 29.Nb3 a4–+ 30.Na1 N6c4 31.Bc4 Nc4 32.Kd1 Kf8 33.Kc2–/+ Ke7 34.Kc3 Kd6 35.Kb4 b6 36.Nc2=+ Nb2 37.f3 f5 38.Ka3 Nd3 39.Ka4 Ne1?? 40.Ne1+– ef3 41.Nf3 Ke6 42.Kb3 Kf6 43.Kc3 g5 44.Kd3 g6 45.Ne5 f4 46.Nd7 Ke6 47.Nb6 Kd6 48.Na4 fe3 49.Ke3 g4 50.hg4 Kc7 51.Kf4 Kd6 52.Kg5 Kc7 53.Kg6 Kd6 54.Kf6 Kd7 55.Ke5 Ke8 56.Kd5 Kf7 57.g5 Kg6 58.b6 Kg5 59.b7 Kf4 60.b8Q Ke3 61.g4 Kd3 62.g5 Kd2 63.g6 Kd3 64.g7 Kd2 65.g8Q Kd3 66.Qb3 Ke2 67.Qgg3 Kf1 68.Qgc3 Ke2 69.Qbb2 Kd1 70.Qcc1# (70.Qbc2#) 1–0. bluepiramid2 (1800) – lecko, kurnik, 2012.

5.e3 Nf6

6.a4 b6 7.Nf3 Bb7 8.d4 e4 9.Nfd2 Nbd7 10.Be2 Be7 11.0–0 0–0 12.g3 (12.Nc3 Qe8+=) 12...g5 (12...Qe8 13.Nc3=) 13.Nc3 Qe8 14.Qb3 Kh8 15.Rfc1 (15.f3 Qg6+=) 15...f4 (15...Qf7 16.Qc2=) 16.ef4 (16.d5!?+/–) 16...gf4+= 17.Nce4?? (better is 17.Qc2 fg3 18.hg3+=) 17...Ne4–+ 18.Ne4 Be4 19.d5 Bf6 20.Bf6 Nf6 21.Bd3 fg3 22.hg3? Qh5 23.Be4 Ne4 24.Qb2 Kg8 25.Re1 Rf2 26.Qf2 Nf2 27.Kf2 Rf8 28.Kg2 Qf3 29.Kh2 Rf6 (29...Rf6 30.Re8 Kf7–+) 0–1. ludice (1765) – skoczekbis (1955), kurnik, 2011.

6.Ne2 e4 7.Nf4 g6 8.Qc2 b6 (8...Bg7 9.Be2+=) 9.Be2 Bg7 10.h4 (10.0–0 0–0+=) 10...0–0= 11.Nc3 Re8 12.0–0–0 c6 (13.d4 Bh6=) =. Grund,Karl – Haeggloef, corr ICCF EU–M–342, 1974.

6.Ne2 Be6 7.Qc2=.

6.Nf3 Be7

7.Qc2 0–0!? =+.

7.Qc2 b6 8.Be2= 0–0 9.d4 e4 10.Nfd2 d5 11.cd5 Nd5 12.Bc4 (12.Ba3 Bd6=) 12...Bb7 (12...c6 13.Nc3 Be6 14.0–0=) 13.Nc3+= Bb4 14.Nd5 (14.0–0 c6+=) 14...Bd5= 15.Qb3 (15.Rc1 Rf7=) 15...Bc4 (15...Bd2 16.Kd2 Bc4 17.Qc4 Rf7 18.Qe6=) 16.Qc4 Kh8 17.Rc1 (17.Rd1 Bd6=) 17...Qh4 (17...Qg5 A) 18.Qc7 A1) 18...Qg2 19.Rf1 f4 20.Bc3 (20.ef4? e3 21.Bc3 ed2 22.Kd2 Qd5–+; 20.Qb6?? fe3 21.Bc3 Bc3 22.Rc3 ed2 23.Kd2 Qf1–+) 20...fe3 21.fe3+–; A2) 18...f4 19.Bc3 fe3 (19...Qg2?! 20.Rf1+=) 20.fe3 Ba3=; B) 18.g3=) 18.Qe2 Nd7 (18...Bd6 19.d5=) 19.a3 Bd2 20.Qd2+= Rad8 21.Rc7 Ne5 22.0–0 Nf3?? 23.gf3+– Qh3 24.fe4?? Qg4= 25.Kh1 Qf3 26.Kg1 Rf6?? 27.Rd1 fe4 28.Rg7 Kg7= 29.d5 Rg8 30.Qd4?? Kh6 (31.Kf1 Qf2#) 0–1. Schmidt,Alexander – Potrafke,Dirk, NRW–chT U18 Germany, 1994.

7.d4 e4 8.Nfd2 0–0 9.Nc3 Nbd7 10.Be2 b6 (10...Nb6!?=) 11.Qb3 Bb7?? (better is 11...Rf7+/–) 12.c5+– Bd5 (12...d5 13.c6 a4 14.Na4 Bc8 15.cd7 Bd7+–) 13.Nd5 (13.Nd5 Kh8 14.Ne7 Qe7 15.c6+–) 1–0. Janek – Bonnie, internet, 2016.

7.d4 e4 8.Nfd2 Be6 9.Nc3 Nbd7 10.Be2 h5 11.0–0 Rh6 12.Rc1 g5 13.f3 g4 14.fe4 Ne4 15.Nde4 fe4 16.Ne4 Bg5 17.Rc3 d5 18.cd5 Bd5 19.Ng5 Qg5 20.e4 Be4 21.Bc1 Qg6 22.Re3 Rh7 23.Bd3 Re7 24.Re4 1–0. Kuhn,N – Hentzgen,T, corr DDR, 1985.

7.Be2 0–0 8.0–0 Kh8 9.Nc3 b6 10.d4 e4 11.Nd2 Nbd7 (11...d5 12.cd5 Bb7 13.Nc4+=) 12.f3+/– Bb7 13.Qc2 Qe8 14.fe4 fe4 15.d5 Qg6 16.Nce4 Nc5 17.Bd3 Nd3 18.Qd3 Ng4 19.Rf4 h5 (19...Rae8 20.Raf1+/–) 20.Raf1+– Rf4 21.ef4 Rf8 22.Rf3 Bc8 23.h3 Nh6?? (better is 23...Nf6+/–) 24.Rg3+– Ng4 25.hg4 hg4 26.c5 Rf4 27.cb6 cb6 28.Qe3 Rf8 (28...Qf7 29.Qb6 Bf5 30.Re3 Be4 31.Re4+– (31.Ne4? Rf1 32.Kh2 Qh5 33.Rh3 gh3–+)) 29.Qb6 Bh4 30.Rc3 Bf5 31.Qd6 Qd6 32.Nd6 Bg6 33.Rc7 Bf2 34.Kh2 g3 35.Kh3 Bf5 36.Nf5 Rf5 37.Rg7 (37...Be3 38.Rg5 Kh7 39.Rf5+–) 1–0. kamret (2195) – Archirey (1865), GameColony.com, 2005.

7.Be2 e4 8.Nd4 c5 9.bc6 Nc6 =.

4.c4 Nf6

5.a4 Be6 6.d3 Nbd7 7.Nc3 (7.Nf3 Be7=+) 7...Nc5 (7...d5 8.cd5 Nd5 9.Nd5 Bd5 10.Bc3=+) 8.e4 (8.e3 d5=) 8...g6 (8...Be7 9.Nge2=+) 9.Nf3= h6 (9...Bg7 10.Be2=) 10.Be2 Bg7 11.h3 (11.0–0 0–0=) 11...0–0 12.Qc2 Nh7 (12...Nfd7 13.0–0=) 13.Bc1 f5 14.Be3 (14.0–0 Qd7=) 14...Nd7 (14...f4 15.Bc5 dc5 16.Nd5=) 15.Rd1 f4 16.Bc1 Nc5 17.Ba3 Ng5 18.Bc5 dc5 19.Ng5 hg5 20.Bf3 Qd7 21.Qe2 Kf7 22.Bg4 Rh8 23.f3 Rh4 24.Qf2 Bf8 25.g3 Rh6 26.Ke2 Be7 27.Nd5 Rah8 28.Qg2 Bd8 29.Be6 Qe6 30.g4 Qd6 31.Rh2 c6=+ 32.Nc3 Qd4–/+ 33.Kd2 Be7 34.bc6 bc6 35.Kc2 Rb8 36.Rb1 Rb4 37.Ne2 Qe3 38.Qf2 Qf2–/+ 39.Rf2 Rh3 40.Nc3 Rh7 41.Na2 Ra4–/+ 42.Nc3 Rb4–+ 43.Ra1 Bd8 44.Ra4 Bc7 45.Ra3 Ke6 46.Na4 Kd6 47.Ra1 Rh4 48.Rg2 Rh3 49.Rf2 Rb8 50.Rb1 Rbh8 51.Rbf1 Rh1 52.Rh1 Rh1 53.Kb2 Rh8 54.Kc3 Rb8 55.Rb2 Rb4 56.Ra2 Rb1 57.Rf2 Ra1 58.Kb3 Rb1 59.Kc3 Bd8 60.Kc2 Rb4 61.Nc3–/+ a4 62.Rf1 a3=+ 63.Rb1 Ba5 64.Na2 Rb1 65.Kb1 Bb4 66.Kc2 Kc7 67.Kb3 Kb6 68.Ka4 Ka6 69.Nc1 Kb7–/+ 70.Kb3 Ka7 71.Ka4 Kb6 72.Kb3 Kc7 73.Ka4 Kb6 74.Na2 Bd2 75.Ka3 Ka5 76.Kb3 Be3 77.Nc3 Bf2 ½–½. Schumann,Hans – Siptitz,Friedrich, Mecklenburg VP–ch Sen, 1997.

5.a4 Be6 6.e3 Nbd7 =+.

5.a4 Be7 6.d4 Nbd7 7.Nf3 =+.

5.a4 Be7 6.e3 0–0 7.Nf3 Nbd7 8.Be2 Re8 9.d4 Bf8 (9...e4 10.Nfd2=) 10.de5 de5 11.0–0 (11.Ne5 Bb4 12.Kf1 Qe7=) 11...e4 12.Nd4 Nc5 13.Nd2 g6 (13...Bd6 14.N2b3=) 14.N2b3+= Nd3 (14...Qd6!?+=) 15.Bd3+– ed3 16.Qd3 c5 17.bc6 bc6 18.Qd1 Bb7? (18...Qc7 19.h3+–) 19.Nf3 (19.Nc6 Bc6 20.Qd8 Red8 21.Bf6 Rd3+–) 19...Qe7 (19...Ne4 20.Qc2+–) 20.Ba3+– Qe6 21.Bf8 Rf8 22.Nc5 Qe7 23.Nb7 Qb7 24.Rb1 Qe7 25.Qd4 Ne4 (25...Rfb8 26.Rb6 Rb6 27.Qb6+–) 26.Qe5 (better 26.Ne5!?+–) 26...Qe5+– 27.Ne5 Nc3 28.Ra1 Rfc8 29.Nd7 (better 29.Ra3!? Ne2 30.Kh1+–) 29...Ra7 30.Nf6 (30.Nc5 Rb8=) 30...Kg7= 31.Ng4 f6 32.h3 h5 33.Nh2 Ne2 (33...Rb7 34.Nf3=) 34.Kh1= Rb7 35.Nf3 Rb4 36.c5 Nc3 The isolani on a4 becomes a target 37.Nd4 Na4 38.Ra3 (38.Rfc1 f5=) 38...Nc5=+ 39.Ra5 Ne4 40.Kg1 c5 41.Ne6 Kh6 42.f3 Nd2 43.Rd1 Rb1 (43...Nb3 44.Ra7 Rb6+=) 44.Rb1+– Nb1 45.Rc5 Rd8?? (better 45...Rc5 46.Nc5 h4+–) 46.Nd8+– (46.Nd8 g5 47.Nf7 Kg6 48.Nd6+–) 1–0. BeepBeepImAJeep (2535) – gustamo (2490), lichess.org, 2019.

5.Qc2 g6 6.Nc3 Bg7 7.h3 0–0 8.g4 Be6 9.e3 c6 10.Nf3 Ne8 11.Rg1 f5 12.g5 d5 13.Na4 Nd7 14.b6 f4 (14...Nb6?! 15.Nb6 Qb6 16.Be5=) 15.Nh4 Nb6 16.Nb6 Qb6 17.Ba3 Rf7 18.Ng6 hg6 19.Qg6 Bf5 20.Qh5 c5 21.h4 fe3 22.fe3 d4 23.g6 Rf6 24.Qh7 Kf8 25.h5 de3 26.de3 a4 (better is 26...Ke7 27.Rg5 e4–+) 27.Rd1?? (27.h6 Qa5 28.Ke2 Bd3 29.Kd1 Bg6 30.hg7 Ng7 31.Bc5 Qc5 32.Qh8 Kf7 33.Qh4 Rd8 34.Qd4 Rd4 35.ed4 Qd4 36.Ke1 Qc3 37.Kd1 Bh5 38.Rg4 Bg4 39.Be2 Rf1) 27...Qa5–+ 28.Ke2 Bc2 (better is 28...Be6 29.Rd5 Bd5 30.cd5 Qc3–+) 29.Rd7+/– Rd8 30.Rd8 Qd8 (31.Bc5 Rd6 32.Bd6 Qd6+/–) +/–. Slesinski,P – Kukula,Pawel (2195), Poland–chT 2nd div North, 1999.

5.Nc3 Nbd7 6.Nf3 Be7 7.e3 0–0 8.Be2 c6 9.d4 e4 10.Nd2 d5 11.0–0 Bb4 12.Rc1 Re8 13.a3 Bc3 14.Bc3 cb5 15.c5 b4 16.ab4 ab4 17.Bb4 Nb8 18.Bc3 Qc7 19.Rb1 Bd7 20.Qb3 Bc6 21.Ra1 Nbd7 22.Rfb1 Reb8 23.Ra3 Qd8 24.h3 Ra3 25.Qa3 Ra8 26.Qb2 Ra7 27.Nb3 Qa8 28.Ra1 Ra1 29.Na1 Qa4 30.Nc2 Qa8 31.Na3 Ne8 32.Nb5 Bb5 33.Qb5 Qc8 34.Be1 Nef6 35.f3 ef3 36.gf3 Nb8 37.Bh4 Nc6 38.Qb3 h6 39.Bf6 gf6 40.Qd5 Qh3 41.Bc4 Qg3 42.Kf1 Qh3 43.Ke1 Qg3 44.Kd2 Qh2 45.Kc3 Qc7 46.Qh5 ½–½. Nett,Philipp (2135) – Agulnick,Michael (2000), CL2–2008.09.04, 2008.

5.Nc3 Be6 6.e4 g6 7.Nf3 Bg7 8.d3 0–0 9.Bc1 h6 (9...Nbd7 10.Ng5=) 10.Be2 Nbd7 11.0–0 Nc5 12.Qc2 Bc8 13.Be3 Ng4 14.Bc5 (14.d4 Ne3 15.fe3 ed4 16.ed4 Ne6=) 14...dc5 15.Rab1 (15.h3 Nf6=+) 15...Qd6 (15...Re8 16.Nd5 b6 17.h3=) 16.Rfe1 Nf6 17.Nd5 b6 (17...Nd7 18.Nd2=) 18.h3 Bd7 19.Bf1 (19.Qc3 Rfd8=+) 19...Rae8 (19...a4 20.Ne3=+) 20.Nc3 (20.Be2 Rd8=) 20...Nh7 (20...Nh5 21.g3=+) 21.Rbd1 (21.Be2 Rb8=) 21...Be6 22.Nd5 Qd8 23.g3 (23.Nh2 Nf6=) 23...Ng5 24.Ng5 hg5 (worse 24...Qg5 25.Nc7 Rd8 26.Nd5+–) 25.Kh2 f5 (25...Qd7 26.Be2=) 26.ef5 Bd5 27.cd5 gf5 28.Bg2 Rf6 29.Re3 (29.Qc4 Qd6=) 29...Rh6 (29...f4 30.Re4=) 30.Qe2 (30.Qc4 f4 31.Ree1 Rf8=) 30...Rf8=+ 31.Kg1 (31.Qc2 f4 32.Re4 Qd7=+ (worse 32...Qd5 33.Rf4 Qd7 34.Qc4 Kh8 35.Rf8 Bf8 36.Re1+–)) 31...Qd7 32.a4 (32.Rb1 f4 33.Rf3 Rd6–/+) 32...f4–/+ 33.Re4 f3 34.Bf3 Qh3 35.Bg2 (35.d6!? cd6 36.Rg4–/+) 35...Qh2 36.Kf1 Qg3 37.Re3 Qh2 (37...Qf4 38.Re4 Qf7 39.Rg4–/+) 38.Rf3 Rf3 (38...Rh4 39.Rf8 Bf8 40.Qe3–/+) 39.Qf3 Qf4 (39...Qh4 40.Qe4 Kf7–/+) 40.Re1? (40.Qf4 ef4 41.Be4 g4=+) 40...g4 (better 40...Qa4!? 41.Qf5 Rf6 42.Qc8 Bf8–/+) 41.Qg3 (41.Qf4 ef4 42.f3 gf3 43.Bf3 Rh3=+) 41…Rf6 (41...Rf6 42.Qf4 ef4=+) 0–1. Creatchy (2815) – Panza (2720), ChessWorld.net, 2019.

5.Nc3 Be7 6.e4 Nbd7 7.g3 0–0 8.Bg2 b6 9.Nge2 Bb7 10.d4 Rc8 11.d5 Nc5 12.0–0 h6 13.f4 Nfd7 14.h4 f5 15.ef5 Rf5 16.Bh3 Rf8 17.Qc2 ef4 18.Nf4 Ne5 19.Ne6 (19.Ne6 Rf1 20.Rf1 (< 20.Bf1 Ne6 21.de6 Nf3 22.Kf2 Qf8–/+; < 20.Kf1 Qe8+/–) 20...Ne6 21.Be6 (21.de6 Nc4 22.Ne2 Nb2=) 21...Kh8 22.Ne2+– (22.Bc8?! Bc8 23.Ne2 Bh3+–)) 1–0. gregorgysi (2290) – ramoschessbrasil (2480), net–chess.com, 2011.

5.Nc3 g6 6.e3 Bg7 7.Nf3 0–0 8.d3 Nbd7 9.d4 ed4 10.Nd4 Nb6 11.Be2 a4 12.0–0 a3 (12...Be6 13.Ne6 fe6 14.a3=) 13.Bc1 Qe7 14.Rb1 (14.Qb3 Ra7=) 14...d5 15.cd5 Nbd5 16.Nd5 Nd5 17.Rb3 Rd8 18.Rd3 Be6 (18...Nf4 19.ef4 Rd4 20.Rd4 Bd4 21.Qd4+–) 19.Ne6+– Qe6? (better 19...fe6 20.Qb3 Qh4+–) 20.Bf3+– (20.Ba3?! Rd7 21.Qb3 Nb6 22.Qe6 fe6+–) 20...c6 21.bc6 (21.Ba3?! Qf6 22.Qb3 Ra5+–) 21...bc6 22.e4 (22.Ba3?! Rd7 23.Qc1 Be5+–) 22...Nc3 (22...Be5+–) 23.Rd8 Bf8 24.Ra8 Nd1 25.Bh6 (25.Bh6 Qe7 26.Rd1+–) 1–0. Pereira – Vintins, internet, 2020.

5.Nc3 g6 6.e4 Bg7 7.Nf3 Nbd7 8.Be2 Nc5 9.Qc2 Nh5 10.0–0 Nf4 11.d3 0–0 12.h3 f5 13.Rad1 Qd7 14.ef5 (14.Ba3!?=) 14...Rf5–/+ 15.Nh2 Rf8 (15...Qf7 16.Bc1 Be6 17.Bg4 Ncd3 18.Rd3 Nd3 19.Qd3 Bc4 20.Qc2=+) 16.Ne4= Ne4 17.de4 Qe7 18.Bg4 Rf7 (18...h5 19.Bc8 Rac8 20.Bc1=) 19.Bc1 Bg4 20.Ng4 Ne6 0–1. sasikumar – pcmvr, net–chess.com, 2019.

5.d4 Nbd7 6.e3 g6 (6...Be7 7.Nf3 0–0 8.Be2=) 7.Nf3 Qe7 8.Be2 Bg7 9.0–0 0–0 10.Qc2 b6 (10...Re8 11.Nc3+=) 11.Nc3+= Bb7 12.de5 de5 13.e4 c6 14.bc6 Bc6 15.Nd5 Bd5 16.ed5 Rac8 17.Qb3 Ne4 18.Rab1 Rfe8 19.Qe3 Nd6 20.Ba3 e4 21.Nd2 Be5 22.Kh1 (22.Rfd1 f5+=) 22...Qh4 23.g3 Qd8 24.Qb3 (24.Ne4? Ne4 25.Qe4 Bd6–+) 24...Nf5 25.Ne4 Nd4 26.Qd3 Ne2 27.Qe2 f5 28.Nd2 Bg3 29.Qd3 Bf4 30.Nf3 Re4 31.Rfe1 Rcc4 32.Re4 Re4 33.Bb2 a4 34.Kg2 Bd6 35.Rc1 Nf6 36.h3 a3 37.Bf6 Qf6 38.Rc6 Qd8 39.Qa6 Re8 40.Rb6 Bf8 41.d6 Kh8 42.Qa5 Bg7 43.Qb5 Rf8 44.d7 Qe7 45.Rb8 Rd8 46.Ne5! Qg5 47.Kf3 Qh5 48.Ke3 (48...Bh6 49.f4 Bf4 50.Kf4 Qh6 51.Kg3 Qg5 52.Kf3 Qh5 53.Ke3 Qg5 54.Kd4+–) 1–0. Fiedler,Peter – Meyer,Torben, DESC, 2003.

5.d4 e4 6.Nc3 =.

5.e3 (--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5 5.c4).

5.g3 Nbd7 6.Bg2=.

5.g3 g6 6.Bg2 (6.Nf3 Bg7=) 6...Bg7 7.Nc3 0–0 8.Nf3 Nbd7 9.0–0 Nc5 10.d3 Re8 (10...a4 11.Ng5=) 11.Nd2 (11.Ng5 Bd7=) 11...a4 (11...Bf5 12.Nde4 Nfe4 13.Ne4 Ne4 14.Be4=) 12.a3 (12.Nde4 a3 13.Bc1 Nfe4 14.Ne4 Ne6=) 12...Bg4 13.h3 (13.Rb1 Qd7=) 13...Bf5 (13...Be6 14.Qc2=+) 14.g4= Bd7 15.Qc2 Qc8 (15...Qe7 16.e3=) 16.e3 h5 17.f3 (17.g5 Bh3 18.Bh3 Qh3 19.gf6 Qg4 20.Kh2 Qh4 21.Kg2 Qg4 22.Kh2 Qh4 23.Kg2 Qg4 24.Kh2=) 17...Bh6=+ 18.Rae1 hg4 (18...Qd8!?=+) 19.fg4+= Kg7? (19...Qd8!?+=) 20.Nf3+– Bg4 (20...Ne6 21.Qf2 Qd8 22.d4+–) 21.hg4 Qg4 (better 21...Ng4 22.Nd1 c6+–) 22.Nh2 (22.Nd5 Nd5 23.cd5 Qg3+–) 22...Qg5? (better 22...Qg3!? 23.Qe2 Rh8 24.Rf6 Be3 25.Qe3 Qh2 26.Kf1 Kf6+–) 23.Rf3+– Kg8 (23...Rh8 24.Re2 Qh5 25.Rh3+–) 24.Nd1 (better 24.Rh3!? Bg7+–) 24...Bg7+– 25.Ref1 (25.Nf2 c6+–) 25...Re7 (25...c6+–) 26.Qe2 (26.Nf2 c6+–) 26...Rae8? (26...Nh5 27.Nc3 c6 28.bc6 bc6 29.Rd1+=) 27.R1f2?? (better 27.Rh3 e4 28.Bf6 Bf6 29.d4+–) 27...Nd3= 28.Rf6 Nb2 29.R6f3 (29.Nc3!? e4 30.Nd5=) 29...Nd3 (29...e4 30.Rh3 Nd3 31.Rf1–/+) 30.Qd3 e4 31.Qd5 ef3?? (better 31...Qd5 32.cd5 ef3 33.Bf3 f5–/+) 32.Qg5+– (32.Qg5 fg2 33.Qd5+–) 1–0. Chaparro Grande,Fernando – Suarez Pazos,Alberto (1750), Gran Canaria Spain, Cabildo Memorial, 2015.

4.c4 g6

5.e3 b6 6.Nf3 Bb7 7.Be2 Bg7 8.0–0 Ne7 9.d4 ed4 10.Nd4 0–0 11.Bf3 Bf3 12.Qf3 Nd7 13.Nd2 Nc5 14.Ne4 Ne4 15.Qe4 Qd7 16.Rac1 Rae8 17.Qc2 f5 18.h3 Kh8 19.Nf3 h6 20.Rfd1 Qe6 21.Bg7 Kg7 22.Qc3 Qf6 23.Qf6 Rf6 24.Nd4 g5 25.Re1 Kf7 26.a4 Ng8 27.Nc6 Ne7 28.Nd4 f4 29.ef4 gf4 30.Re4 Ng6 31.Rce1 Re4 32.Re4 Ne5 33.Ne2 f3 34.gf3 Rf3 35.Kg2 Ra3 36.f4 Nd7 37.Nd4 Ra4 38.Ne6 Nc5 39.Nd8 Kf8 40.Rd4 Ra2 41.Kg3 a4 42.f5 Ra3 43.Kg4 Rd3 44.Rf4 a3 45.Nc6 a2 46.Rf1 Rb3 47.f6 Rb1 0–1. kaasparov – sseth (1735), kurnik, 2012.

5.e3 Nd7 6.Nc3 Bg7 7.Nf3 Ngf6 8.Be2 0–0 9.d4 Re8 10.0–0 ed4 11.Nd4 Nc5 12.Bf3 Bd7 13.Nb3 Nb3 14.ab3 Qc8 15.b6+= cb6 16.Qd6 Ng4 17.Bg4 Bg4+= 18.Qb6 Ra6 19.Qb5 Re5 20.Qa4 Bf3 1–0. Zhoukov – Makarevic, corr, 1972.

5.e3 Nd7 6.Nf3 Bg7 (--> 5.e3 Bg7 6.Nf3 Nd7).

5.Nf3 Bg7 6.e3 c6 7.Be2 f5 8.0–0 Nf6 9.Nc3 Be6 (9...e4 10.Ne1+=) 10.Qb3 (10.d4 Nbd7+/–) 10...Nbd7 11.Rac1 c5 12.Na4 h6 13.Nh4 (13.d4 e4 14.Nd2 Qe7+=) 13...Bf7 14.d4 cd4 15.ed4 e4 (15...0–0 16.Rfe1=) 16.d5 (16.Qg3 Ng4 17.Bg4 fg4 18.Qg4 Nf6+/–) 16...0–0= 17.g3 (17.Qa3 Nb6=) 17...Kh7 18.Ng2 Ne5 19.Nf4 Qe7 20.Nb6 Rae8 21.Ba3 g5=+ 22.Ng2 Bh5 23.Bh5 Nh5 24.c5 Nf3–/+ 25.Kh1 Be5 26.c6 f4?? 27.c7 fg3? 28.fg3+– Bg3 29.c8Q Rc8 30.Nc8 Qd7 31.Rc7?? Qc7–+ 32.Nd6 Bh2 33.Ne4= Bg1?? 34.Rf3?? Qh2# 0–1. orangutanb4 (2095) – kaka025 (2040), kurnik, 2011.

5.d4 Nd7

6.e3 Ngf6 7.Nf3 Bg7 8.Be2 0–0 9.0–0 ed4 10.Nd4 a4 11.a3 Nb6 12.Qc2 Re8 13.Nd2 Nfd7 14.Rad1 Nc5 15.Rfe1 Bd7 16.Bc3 Qf6 17.Qb2 g5 18.h3 h5 19.Rc1 Qh6 20.Nc2 g4 21.Bg7 Qg7 22.Qg7 Kg7 23.h4 Nb3 24.Rcd1 Bf5 25.Nd4 Bh7 26.Nf1 Re5 27.Ng3 Kh8 28.Nf1 Rae8 29.f3 gf3 30.gf3 Na5 31.Rc1 Rc5 32.e4 Nbc4 33.Rc3 Nb6 34.Rec1 f5 35.Rc5= dc5 36.Rc5 Nb3 37.Nb3 ab3 38.Bd1 b2 39.Bc2 fe4 40.fe4 Be4 (40...Be4 41.Nd2 Bc2 42.Rc2 Na4–+) 0–1. Kaltschmidt,Andreas (2210) – Tauscher,David (2425), RSX7E – A00 – Sokolsky–2, 2009.

6.Nf3 ed4 7.Nd4 Bg7 8.e3 Ngf6 9.Nc3 0–0 10.Be2 Nc5 11.0–0 Re8 12.Rc1 h5 13.Nd5+= Ng4 14.h3 Nf6 15.Qc2 Bd7 16.Rfd1 Nd5 17.cd5 b6 18.Bc4 Qg5 19.Nf3 Qe7 20.Bg7 Kg7 21.Rd4 Bf5 22.Qc3 Qf6 23.Nd2 Kg8 24.Be2 Re7 25.Bh5!+/– Qg7 26.Bg4 Bg4 27.Rg4 Qc3 28.Rc3 Re5 29.Rd4 Ree8 30.f3 Kg7 31.Kf2 Kf6 32.h4 Kg7 33.Nb3 f5 34.Nd2 Rh8 35.Nb3 Rae8 36.Nc5+– dc5 37.Rf4 Re5 38.Rd3 Rd8 39.e4 Kf6 40.g4 Ke7 41.Re3 fe4 42.fe4 Rh8 43.g5 Kd7 44.Kg3 Re7 45.Ref3 Rhe8 46.Rf7 c4 47.e5 c3 48.Rc3 Rf7+/– 49.e6 Re6 50.de6 Ke6 51.Rc6 Kf5 52.a4 Rg7 53.Rf6 Ke5 54.Kg4 Kd4 55.h5+– gh5 56.Kh5 Ke5 57.Kh6 Rd7 58.Rf1 Rd2 59.g6 Rh2 60.Kg7 Ke6 61.Kg8 Rh4 62.g7 Ke7 63.Rf7 Ke8 64.Rc7 Ra4 65.Kh7 (65...Rh4 66.Kg6 Rg4 67.Kf6+–) 1–0. Sanguinetti,Raul – Bielicki,Carlos, Punta del Este, 1964.

6.Nf3 Bg7 7.e3 e4 8.Nfd2 f5 9.Nc3 Ngf6 10.Be2 Nb6 11.0–0 0–0 12.c5 Nbd5 13.Bc4 dc5 14.dc5 Be6 15.Qb3 c6 16.Rfd1 Rf7 17.Nd5 cd5 18.Be2 f4 19.ef4 Qc7 20.Qe3 Nh5 21.Bg7 Ng7 22.g3 Raf8 23.Nb3 g5 24.fg5 Nf5 25.Qc3 a4 26.b6 Qe7 27.Nd2 d4 28.Qb2 d3? 29.Bh5+– (29...e3 30.fe3 Qc5 31.Bf7 Rf7 32.Re1 Ne3 33.Ne4+–; 29.Ne4?! de2 30.Qe2 Rg7+/–) 1–0. Bringsken,Peter (1930) – Zylla,Johannes (2135), BdF, 2004.

6.Nf3 Bg7 7.e4 ed4 8.Nbd2 =.

6.Nf3 Bg7 7.e4 Ne7 8.Nc3 0–0 9.Be2 ed4 10.Nd4 Re8 11.0–0 Nc5 12.f4 (12.Re1 Be5=) 12...f5 13.Bf3 fe4 14.Ne4 Ne4 15.Be4 d5 16.cd5 Nd5 17.Qd3 Bg4 18.Rae1 Qd7 19.h3 Nb4 20.Qc4+– Be6 21.Ne6 Qe6 22.Qe6 Re6 23.Bb7 Rae8 24.Re6 Re6 25.Bg7 Kg7 26.Rc1 Re7 27.a3 Nd3 28.Rc4 Kf6 29.g4 Rd7 30.Kg2 Kf7 31.Kf3 Nb2 32.Rc6 Nd3 33.Ke3 Ne1 34.f5 gf5 35.gf5 Re7 36.Kf4 Nd3 37.Kg5 Rd7 38.Bc8 Re7 39.Re6 Nc5 40.Re7 Ke7 41.f6 Kf7 42.Bf5 h6 43.Kh6 Kf6 44.Bg6 Ne6 45.h4 Nd4 46.a4 c5 47.b6 c4 48.Be4 c3 49.h5 Nc6?? 50.Kh7 Nb8 51.h6 Kf7 52.Bc2 Nc6 53.b7 Nb8 54.Bb3 Kf6 55.Kg8 c2 56.Bc2 Nc6 1–0. SuperForte – ChessMaster2000, 1994.

6.Nf3 Bg7 7.e4 Ne7 8.Nc3 0–0 9.de5 Ne5 10.Ne5 de5 (10...Be5 11.Bd3=) 11.Be2 (11.Ba3 Qd1 12.Rd1 Bf6+/–) 11...Re8 12.0–0 f5 13.Qc2 Qd6 14.Rad1 Qc5 (14...Qf6 15.Rfe1+/–) 15.Na4+/– Qa7 16.c5 Be6 (16...h6 17.Qb3 Kf8 18.Bc4+–) 17.Bc4+– Bc4 18.Qc4 Kf8 19.c6 b6 20.ef5 g5 21.Rd7 Bf6 22.f4! Rad8 23.Qe6 gf4 24.Qf6 (24.Qf6 Kg8 25.Be5 Rd7 26.Qg7) 1–0. Fournier,Frederic (2265) – NeOSoNaR (2120), Active, 2002.

5.e3 Bg7

6.Nc3 Nd7 7.d3 Ne7 8.Nf3 0–0 9.Be2 f5 10.Qc2 b6 11.d4 f4 12.Ng5 Nf6 13.de5+= de5 14.Rd1 Qe8 15.e4 h6 16.Nf3 Nd7 17.Ba3 Bb7 18.Nd5 Bd5 19.cd5 Ra7 20.0–0 Rf6 21.Rc1 g5 22.Nd2 Nc8 23.Bg4 Nf8 24.Nc4 f3 25.Bf3 Rf4 26.Qe2 Qg6 27.g3 g4 28.Bg2 Rf7 29.f3 h5 30.fg4 Qg4 31.Qg4 hg4 32.Rf7 Kf7 33.Rf1 Ke8 34.Bf8 Bf8 35.Ne5 Bc5 36.Kh1 a4 37.Nc6 Ra8 38.e5 Ne7 39.Ne7 Be7 40.d6 (40...Ra5 41.dc7+–) 1–0. Beyer,G – Butze,R, IV.BFM Karl–Marx–Stadt, 1971.

6.Nc3 Nf6 7.Nf3 c5 (7...0–0 8.d4 ed4 9.Nd4=) 8.d4 ed4 9.ed4 0–0 10.Be2 Re8 11.0–0 Bf5 12.dc5 (12.Re1 Nbd7+=) 12...dc5 (12...Ne4 13.Ne4 Bb2 14.Nd6 Ba1 15.Qd5+=) 13.Qd8 Rd8 14.Ne5?? Nfd7 15.Nd7= Nd7 16.Na4 Ne5 17.Nc5+= Rd2 18.Be5 Be5 19.Rae1 b6 20.Bd3 Bd3 21.Nd3 Bh2 22.Kh2 Rd3 23.Re7 Rb8 24.Rfe1 Kf8 25.Rc7 Re8 26.Re8 Ke8 27.c5 Kd8 28.cb6 Rd6 29.a4 Rf6?? 30.Rc6 (30...Rc6 31.bc6+–) 1–0. Fuzishawa – Batista de Lima, corr Brazil, 1995.

6.d4 Nh6 =.

6.Nf3 Nd7 7.a4 Ngf6 8.d4 0–0 9.de5 de5 10.Qc2 Re8 11.Nbd2 c5 12.Be2 b6 13.0–0–0 Qc7 14.Ng5 Bb7 15.Bf3 Bf3 16.gf3 h6 17.Nge4 Rad8 18.h4 Nh5 19.Rhg1 Nf8 20.Rg2 f5 21.Ng3 Ng3 22.Rg3 h5 23.Rdg1 Rd6 24.Nb1 e4 25.Nc3+= ef3 26.Nd5 Bb2 27.Qb2 Qg7 28.Rf3 Qb2 29.Kb2 Kf7 30.Kc2 Re4 31.Rf4 ½–½. Roczniak,Jan – Wrobel,M, Poland, 1981.

6.Nf3 Nd7 7.d4 Ngf6 =.

6.Nf3 Nd7 7.Be2 Ne7 8.d4 0–0 9.Nc3 ed4 10.ed4 Nb6 11.0–0 Bg4 12.Qd3 c5 13.d5 Qd7 14.h3 Bf3 15.Bf3+/– (15...a4 16.Rae1+/–) 1–0. Adam – Flechsig, corr, 1974.

6.Nf3 Nf6 7.Nc3 =.

4.d4 ed4

5.Qd4 Nf6 6.e3 Be6 7.Nf3 Nbd7 8.Bd3 Nc5 9.0–0 Be7 10.Nbd2 d5 11.Rad1 0–0 12.Ng5 h6 13.Ne6 fe6 14.Bg6 c6 15.bc6 bc6 16.Nb3 Ncd7 17.Qh4 a4 18.Nd4 Ne5 19.Bd3 Qd7 20.Qh3 Rab8 21.Ba1 Neg4 22.c4 Bd6 23.f4 Qe8 24.cd5 cd5 25.Rc1 h5 26.Rc6+= Rd8 27.Bb5+/– (27...Qe7 28.Ba4+/–) 1–0. Schuster,Peter (2340) – Zylla,Johannes (2135), BdF, 2004.

5.Bd4 Nf6 6.Nf3 Nbd7 7.e3 g6 (7...Be7 8.Bd3+=) 8.Bd3 Bg7 9.0–0 0–0 10.Nc3 c5 11.bc6 bc6 12.Rb1 c5 13.Bf6 Nf6 14.Bc4 Be6 15.Nd5 Rb8 16.Qd3 Qd7 17.Bb5 (17.a3 Nd5 18.Bd5 Bd5 19.Qd5 Rb1 20.Rb1 Qa4+=) 17...Rb5 18.Nf6 Bf6 19.Qb5 Qb5 20.Rb5 Bc4 21.Ra5 Bf1 22.Kf1 Rb8 23.Ra6 Be7 24.Ra7 Kf8 25.c4 Rb2+/– 26.a3 Rc2 27.Ra4 Bf6 28.Ne1 Ra2 29.Nd3 Bc3 30.Ra6 Ke7 31.Nf4 Be5 32.Nd5 Kd7 33.Ra7 Ke8 34.f4 Bb2 35.a4 h5 36.a5 h4 37.a6 h3 38.Rb7 Ra6 39.Nc7 Kf8 40.Na6 hg2 41.Kg2 Bc3 42.Nc7 Kg7 43.Ne8 Kf8 44.Nd6 f6 45.Ne4 1–0. orane – kop, internet, 2003.

5.Bd4 Nf6 6.Nf3 Be7 7.e3 0–0 8.Bd3 Bg4 9.0–0 Nbd7 10.h3 Bh5 11.Nbd2 Ne5 12.Be5 de5 13.g4 Bg6 14.Ne5 Bd3 15.Nd3 Nd5 16.Qf3 c6 17.bc6 bc6 18.Ne4 Qd7 19.c4 Nb4 20.Nf4 f5 21.Rfd1 Qc8 22.Nd6 Bd6 23.Rd6 fg4 24.Qg4 Qg4 25.hg4 Rad8 26.Rad1 Rd6 27.Rd6 Na2 28.Rc6 Nc3 29.Ra6 a4 30.Nd5 Nd5? 31.cd5 Rd8 32.e4 Re8 33.Ra4 Kf7 34.f4 Kf6 35.e5 Kg6 36.d6 1–0. b4_player (2220) – lisarik (1900), GameColony.com, 2003.

5.Nf3 Nd7 6.Nbd2 Ngf6 7.g3 a4 8.Bg2 g6 9.Bd4 Bg7 10.Rb1 0–0 11.0–0 Re8 12.c4 Ng4 13.e3 Nc5 14.h3 Ne5 15.Ne5 Be5 16.Nf3 Bg7 17.Rb4 Be6 18.Kh2 a3 19.Ne1 Qe7 20.Qc1 Bf5 21.Bf3 Be4 22.Qc3 Bf3 23.Nf3 Bd4 24.ed4 Qe2 25.Kg2? Nd3–+ 26.Rb3? Nb2?? 27.c5+= Nd1 28.Qd2 Qd2 29.Nd2 Nb2 30.Nb1 Nc4 31.cd6 Nd6 32.Rc1 Re2 33.Ra3 Ra3=+ 34.Na3 Ra2 35.Nc4 Nb5 36.Rb1 Nd4 37.Rb7 Ne6 38.Ne5 Kg7 39.h4 Kf6 40.Nc6 Ra6 41.Nb4 Rd6 42.Kf1 Ke5 43.Nc2 f5 44.Ne3 Ke4 45.Rb4 Rd4 46.Rb8 f4 47.Re8 Rd6 48.Nc4 Rc6 49.Nd2 Kf5 50.Re7 fg3 51.Rh7? Rc2–+ 52.Rd7 Kg4 53.fg3 Kg3 54.h5 gh5 55.Rd3 Kg4 56.Ne4 Nf4 57.Rd7 h4 58.Rg7 Kf5 (59.Re7 Re2–+) 0–1. Bianchi,Albino – Sorin,Ariel, corr ARG–94–545, 1987.

4.d4 Nd7

5.e3 f5 6.Bd3 e4 7.Bc4 Nb6 8.Bg8 Qg5 9.Bh7? Qg2–+ 10.Qh5 Kd8 11.Qg6 Qh1 12.Qg5 Be7 13.Qg7 Rh7! 14.Qh7 Qg1 15.Ke2 Be6 16.Nd2 Qg4 17.Kf1 Nc4 18.Qh8 Kd7 19.Qa8 Nd2 20.Ke1 Nf3 21.Kd1 Qg1 22.Ke2 Bc4# 0–1. McNab,IA – Miles,Anthony J, BCF–ch U14 Oxford, 1967.

5.e3 g6 6.Nf3 Bg7 7.Bd3 Ne7 8.0–0 0–0 9.Nbd2 a4 10.e4 c5 11.bc6 bc6 12.Nc4 Qc7 13.Rb1 Ba6 (13...Rb8 14.Qe2+=) 14.de5 de5 15.Qe2 Bc4 16.Bc4 a3 17.Bc3 Rab8 18.Bb4 c5 19.Ba3 Nc6 20.Rb8 Rb8 21.Ng5 Rf8 22.Qf3 Nd4 23.Bf7+– Kh8 24.Qh3 h6 25.Bg6 Ne2 26.Kh1 Nf4 27.Ne6 Nh3 28.Nc7 Nf2 29.Kg1 Ng4 30.Rf8 Bf8 31.Bf5 Ngf6 32.Ne6 Bd6 33.Bc1 h5 34.a4 c4 35.Bg5 Ne8 36.a5 Nc7 37.Nc7 Bc7 38.Bd7 Ba5 39.Bf6 Kh7 40.Be5 1–0. kamret (2170) – peti0815 (2105), GameColony.com, 2003.

5.e4 Ngf6 6.Nc3 Be7 +=.

5.e4 Ngf6 6.Nd2 ed4 7.Ngf3 Be7 8.Bd3 0–0 9.0–0 Re8 (9...Nc5 10.Nd4 Re8 11.a4=) 10.Bd4 Ng4 11.h3 Nge5 12.Qe2 Nf3 13.Nf3 (13.gf3? Bf6 14.Bf6 Qf6–+ (worse is 14...gf6 15.Qe3=); 13.Qf3?! Bf6 14.c3 Ne5=) 13...Bf6 14.c3 b6 15.Rad1 Bb7 16.Rfe1 Qe7 17.Bc2 h6 18.Qf1 Ne5 19.Nh2 c5 20.Be5 Be5 21.Qd3 Rad8 22.Ng4 Qh4 23.a4 h5 24.Ne5 Re5 The pressure on e4 grows 25.Qe3 Re6 26.f3 Rde8 27.Qf2 Qf4 28.Rf1 h4 29.Qd2 Qg3 30.Rf2 Rd8 31.Bb3 Rg6 32.Qa2 d5 33.ed5 Qh3= 34.Qe2 Qd7 35.Bc2 Re8 36.Qd2 Rh6 37.Re2 Re2 38.Qe2 Kf8 39.c4 Qe7 40.Qe7 Ke7= 41.Re1 Kd8 42.Bf5 Rh5 43.Bh3+= Bc8 44.Bc8 Kc8 45.Re7 Rf5 46.Kh2 g5 47.Re4 Rf6 48.Kh3 Kd7 49.Kg4 1–0. Millstone,Dr. Michael (2445) – Peschardt,S (2085), ICCF NFL Championship I, 2008.

5.e4 Ngf6 6.Bd3=.

5.e4 g6 6.Nf3+= Bg7 7.Bd3 Ngf6 8.0–0 Nh5 (8...0–0 9.Re1+=) 9.Re1 0–0 (9...Nf4 10.c3+=) 10.a3 (10.Bc3 ed4 11.Bd4 Bd4 12.Nd4 Nf4=) 10...Qe7 (10...Nf4 11.Re3=) 11.de5 (11.Nc3 Nf4+=) 11...de5 12.Nc3 c6 13.bc6 (13.Ra2 Rd8=) 13...bc6 14.h3 (14.Rb1 Nf4=) 14...Nc5 15.Rb1 Ne6 (Better is 15...Rd8–/+) 16.Na4+= Nef4 17.Nb6 Bh3 18.Na8 Bg2 19.Nb6+/– Rd8? 20.Nc4+– Nd3 21.cd3 Nf4 22.Re3 f6 23.Na5 Qe6 24.Ne1 Bh3 25.Qb3 Rd5 26.ed5 Qg4 27.Rg3 Ne2 28.Kh2 Ng3 29.dc6 Kf8 30.Qb4 Qb4 31.ab4 Nf1 32.Kh3 Nd2 1–0. kamret (2165) – peti0815 (2075), GameColony.com, 2003.

5.Nf3 e4 6.Nfd2 Ngf6 7.e3 Be7 8.c4 d5 9.Nc3 Nb6 10.cd5 Bf5 11.Be2 Nfd5 12.Nce4+/– Be4 13.Ne4 Bb4 14.Nd2 Qg5 15.0–0 Ne3+= 16.fe3 Qe3 17.Kh1 Qd2= 18.Qd2 Bd2 19.Bf3 0–0–0 20.Bg4 Kb8 21.Rf7 Nc4 22.Rd1 Nb2 23.Rd2 Nc4 24.Rc2 Rd4 25.Be2 Nd6 26.Rfc7?? Nb5?? 27.Rg7+= Rb4 28.h3 Nd4 29.Rd2 Rb1 30.Kh2 Ne6 31.Re7+/– Nf4 32.Bf3+– Ng6 33.Rg7 Ka7 34.Rdd7 Rg8?? 35.Rg8 1–0. Maltzov,Igor P – Spencer,Leo W, corr CCCA Canada, 1971.

5.e3 Ngf6

6.a4 Be7 7.Nd2 0–0 8.Bd3 Re8 9.Ne2 Bf8 10.c4 g6 11.0–0 Bg7 12.Ng3 b6 13.f4 Bb7 14.f5 Bh6 15.Re1 ed4 16.ed4 Re1 17.Qe1 Ng4 18.Ndf1 Qh4 19.h3 Ndf6? (19...Ngf6 20.fg6 hg6 21.Nf5+/–) 20.Ne4?? (Better is 20.hg4 Re8 21.Ne2 Qg4 22.d5+–) 20...Qe1+= 21.Nf6 Nf6 22.Re1 Re8 23.Re8 Ne8 24.c5 Bd5 25.fg6 hg6 26.cb6 cb6 27.Bc2 Nf6 28.Ba3 Ne8 29.Kf2 ½–½. Mandak,P – Zaruba,A, CZE League, 1998.

6.c4 Be7 7.Nd2 =.

6.c4 g6 7.Nf3 Bg7 8.de5 Ng4 9.Nd4 (9.Be2 0–0=) 9...Nde5 (< 9...Nge5 10.f4+/–) 10.Be2 (10.h3 Nh6=) 10...0–0 (10...Qh4 11.g3 Qh3 12.Bf1=) 11.Nc3 (11.0–0 Qh4 12.h3 Nf6=) 11...f5 (11...Qh4 12.g3 Qd8 13.0–0=) 12.Nd5 (12.0–0 Qh4 13.h3 Nf6=) 12...c6 (12...c5 13.Nb3=) 13.Nf4 Qe7 (13...Qh4 14.g3 Qg5 15.bc6 bc6 16.Nc6 Nc6 17.Qd5 Rf7 A) 18.Qc6? Bb7 19.Qd6 Bb2–+ (19...Bh1?! 20.Bg7 Rg7 21.f3 Ne3 22.Qe6 Rf7 23.Kf2–/+); B) 18.Bg7=) 14.bc6 bc6= 15.h3 Nf6 16.Qc2 Ne4 17.Nf3 Rb8=+ 18.Be5 de5–/+ 19.Nd3 Ng3 20.fg3=+ e4 21.Nd4 ed3 22.Qd3 Bb7 23.c5 Rfe8 24.0–0–0 Qc5 25.Qc4 Qc4 26.Bc4 Kh8 27.Rhe1 c5 28.Nb5 Bg2 29.Rd2 Bh3 30.Rh1 Bg4 31.Nd6 Bc3 32.Rdh2 Bh5 33.Nf5 Rb4 34.Nd6? Re7 35.a3 Rb8 36.Nf7 Kg7 37.Nd6 Rf8 38.g4 Be5 39.gh5 Bd6–/+ 40.h6 Kh8 41.Rd2 Re4 42.Bb5 c4?? 43.a4?? Bc5–+ 44.Rh3 Ba3 45.Kb1 c3 46.Kc2?? Bb4 47.Bd3?? Re5 48.e4?? Rf4 49.Rg2–/+ Rf6 50.Kb3 g5 51.Rg4 Kg8 52.Rh2 Kf8 53.Rh5 Rg6–+ 54.Bc2 Ke7 55.Rf4 Rf6 56.Rg4–/+ Rg6 57.Rf4–+ Kd6 58.Rf7–/+ g4 59.Rh7? Rh5–+ 60.e5 Ke5 61.Bg6 Rg5 62.Bd3 Rh5 63.Rh8 Kf4 64.h7–/+ Bd6 65.Rc8= Be5 66.Rc4 Ke3 67.Bg6 Rh3 68.Rg4 Kd2 69.Rg2 ½–½. Andersson,Lars H – Johansson,Bertil, corr SM–1995 M–195, 1995.

6.Nd2 e4 =.

4.d4 e4

5.c4=.

5.d5=.

4.e3 a4

5.a3 b6 6.c4 Nd7 7.d4 ed4 8.ed4 d5 9.Nc3 dc4 10.Bc4 Ndf6 (10...Bb7 11.Nf3+=) 11.Na4 (11.Nf3 Bd6+/–) 11...Ne7 (11...Bb7 12.f3+=) 12.Ne2 Ned5 13.0–0 Bd6 14.Nac3 Be6 15.Qb3 0–0 16.Nd5 (worse is 16.Bd5 Nd5 17.Nd5 Bd5=) 16...Bd5 17.Bd5 Nd5 18.Ng3 Nf4 19.Rfe1 h5 (19...Qg5 20.Bc1+/–) 20.Nf5 (20.Qf3!?+/–) 20...Qg5+= 21.Qf3?? (better is 21.Ne3+=) 21...Qf5–+ 22.g3? Nh3 23.Kg2 Qf3 24.Kf3 Ng5 25.Kg2 Rfe8 26.h4 Ne4 27.Re2? Nf6 28.Rae1? Re2 29.Re2 Ba3 30.Ba3 Ra3 31.Rc2 Nd5 32.Re2 Kf8 33.Re5 Nc3 34.Rh5 Rb3 35.Rh8 Ke7 36.Rc8 Nb5 37.h5 Rd3 38.Rg8 Kf6 39.h6 gh6 0–1. carocan (1650) – kornelback (1725), kurnik, 2011.

5.a3 Be6 6.c4 c6 7.Nc3 Nf6 8.Nf3 (8.Na4 cb5 9.cb5 Be7+=) 8...Bg4 (8...cb5 9.Nb5 Be7 10.Rb1=) 9.Be2 Bf3 (9...e4 10.Nd4 Be2 11.Nde2=) 10.Bf3 Qe7 (10...cb5 11.Nb5 Nc6 12.Nc3+/–) 11.0–0 e4 12.Be2 cb5 13.cb5 Nbd7 14.Na4 d5 15.Nc3 Nc5 (15...Qe5 16.f4 Qf5 17.Kh1+/–) 16.d4 Ncd7 17.Qb3 Nb6 18.a4 (18.f3 ef3 19.Rf3 Ng4+–) 18...Qb4+/– 19.Qb4 (19.Qc2 Qa5+/–) 19...Bb4+= 20.Rfc1 0–0 21.Ba3 Ba3 22.Ra3+/– Rfc8 23.a5+– Nc4? 24.Bc4 Rc4 25.Kf1 Kf8 26.Ke2 Ke7?? 27.Kd2 Kd6 28.b6 Rb4+/– 29.h3 Rc8?? 30.Na2 Rb2= 31.Ke1?? Rc1?? 32.Nc1+/– Nd7 33.Rc3 Rb5 34.Nb3 Nb8? 35.Kd2?? Nc6= 36.g3 Na5 37.Na5+/– Ra5 38.Rc7 Ke6 39.Rb7 Rb5 40.Rb8 h6 41.b7 Kd7 42.Rf8+– Rb2 43.Ke1 Rb1 44.Ke2 Rb2 45.Kf1 Rb7 46.Rf7 Kc6 47.Rb7 Kb7 48.Ke2 Kc6 49.f3 Kb5 50.f4 Kc6 51.g4 Kd6 52.h4 Ke6 53.Kf2 g6 54.Kg3 Kf6? 55.Kh3 h5?? 56.Kg3 Ke6 57.f5! gf5 58.g5 Kf7 59.Kf4 Kg6 60.Ke5 f4 61.Kf4 (61.Kf4 Kg7 62.Ke5 Kf7 63.Kd5 Ke7 64.Ke4 Kd6 65.d5 Kc5 66.Ke5 Kb5 67.g6 Ka6 68.g7 Kb7 69.g8Q Kb6 70.d6 Kb7 71.d7 Ka7 72.Qa2 Kb6 73.d8Q Kc5 74.Qad5 Kb4 75.Q8a5) 1–0. Fournier,Frederic – panambi, Active (5/5), 2004.

5.a3 Be6 6.c4 Nd7 7.d3 (7.d4 Ngf6=) 7...Ngf6 8.Be2 (8.Nf3 Be7=) 8...Nc5 (8...d5 9.Nf3 Bd6 10.d4=) 9.Nd2 (9.Nf3 Be7=) 9...Be7 (9...Bf5 10.d4 ed4 11.ed4 Nd3 12.Bd3 Bd3 13.Qf3 Qe7 14.Kd1+=) 10.Ngf3 (10.d4 ed4 11.ed4=) 10...Nfd7 (10...Bf5!? 11.e4 Bg4=) 11.0–0 (11.d4 ed4 12.ed4 Bf6+/–) 11...0–0 (11...Bf5 12.d4 ed4 13.ed4+=) 12.d4 e4 13.Ne1 Bf6 (13...Nb3 14.Nb3 ab3 15.Qb3+/–) 14.Qc2 (14.Rb1 Nb3 15.Ne4 d5 16.cd5 Bd5+/–) 14...Nb3 15.Nb3 ab3 16.Qb3 (16.Qe4 Nb6 17.Qb7 Nc4+=) 16...Nb6+= 17.a4 (17.f3 d5 18.fe4 Nc4 19.ed5 Qd5 20.Rf6 Nb2 21.Qd5 Bd5+/–) 17...c5 (17...d5 18.cd5 Qd5 19.Qc2+=) 18.a5 (18.bc6 bc6 19.a5 Nd7+/–) 18...Nd7 19.b6 (19.d5 Bf5 20.Bc3 Ne5+/–) 19...Ra6 (19...Re8 20.Nc2+/–) 20.Nc2 (20.f3 Bf5+/–) 20...Qa8 (20...Re8 21.f3 Bf5 22.fe4 Be4 23.Bd3+/–) 21.Bc3 Qc8 22.Na3 Rd8 23.Nb5+– Nb6? 24.ab6 Rb6 25.Ba5 Ra6 26.Bd8 Qd8 27.Ra6 ba6 28.d5 Bd5 29.cd5 ab5 30.Qb5 g6 31.Rb1 Bg7 32.Qb8 Qb8 33.Rb8 Bf8 34.g4 h6 35.Kg2 Kg7 36.Kg3 Be7 37.Re8 (37...Bf6 38.Re4+–) 1–0. Olsen,Birger – Nilsen,Nils Henrik, Kalotturneringen, 2001.

5.a3 Be6 6.d4 ed4 7.Bd4 Nf6 =.

5.a3 Nf6 6.c4 Be7 7.Nc3 0–0 8.e4 Ng4 9.h3 Nf6 10.Nf3 Nbd7 11.Bd3 Nc5 12.Bc2 b6 13.Na4?? (13.d3 Nfd7+=) 13...Nce4 (13...Ra4 14.d4 Rc4 15.dc5 Rc5–/+ (15...Ne4?! 16.cb6 Nc5 17.Nd2=; worse is 15...bc5 16.Nd2 Rd4 17.Bd4 cd4 18.0–0+=)) 14.0–0= Bb7 15.Re1 Nc5 16.Nc5 Bf3? (better is 16...bc5!? 17.Qe2 Re8=) 17.Qf3+/– (17.gf3?! dc5 18.Be5 Qd7+=) 17...bc5 18.Qc6 Rb8 19.a4 Rb6 20.Qf3 Nd7 21.d4 Bf6? 22.d5 Rb8 23.Be4 Nb6 24.Qe2 Ra8 25.a5 Nd7 26.a6 Qb8 27.g3 Nb6 28.f4 Re8 29.f5 Qc8 30.g4 g6 31.Rf1 Kg7 32.Kg2 Bh4 33.Bc1 h6 34.fg6 fg6 35.Qd3 Rf8 36.Bb2 Qe8 37.Rf8 Qf8 38.Rf1 Qe8 39.Qf3 Qe7 40.Qe2 Qd7 41.Qc2 Qe8 42.Bc1 Nd7 0–1. cogit – master6777, kurnik, 2012.

5.a3 Nf6 6.c4 g6 7.Nc3 Bg7 8.Na4 0–0 9.Nc3 Nbd7 10.Nf3 Nc5 11.d4 ed4 12.Nd4 Re8 13.Be2 Nfe4 14.Ne4 Ne4 15.Bf3 Ng5 (15...Nc5 16.0–0+=) 16.Bd5+/– Ne6 17.0–0 Nd4 18.Bd4 Qg5 (18...Bd4 19.ed4 Ra7 20.Qf3+–) 19.Bg7 Kg7 20.a4 Ra5 21.Qd2 (better is 21.Qf3!? Qf5 22.Bb7 Bb7 23.Qb7+–) 21...b6+/– 22.Bc6 Rd8 23.Rfd1 Bg4 24.Qd4 Kg8 25.Rd2 Be6 26.h4 Qh6 27.Qf6 Re8?? (better is 27...Rc8+/–) 28.Be8+– 1–0. mikebaldini (1615) – mmagrawal (1665), gameknot.com, 2016.

5.c4 a3 6.Na3+= c6 7.Nf3 (7.bc6 Nc6 8.Nb5 Bf5+–) 7...cb5 (7...e4 8.Nd4+=) 8.cb5 (8.Nb5 Nf6+–) 8...d5 (8...Nf6!?+–) 9.Be5+– Ba3? (better 9...Nd7 10.Nc2 Ne5 11.Ne5 Bd6+–) 10.Bg7 f6 (10...Bb2 11.Bb2 Nf6+–) 11.Bh8 Bb2 (11...Nh6 12.Qc2+–) 12.Rb1 Ra2 (12...Ba3+–) 13.Qb3 Qa5 14.Rb2 Ra1 15.Rb1 Rb1 (15...Bf5 16.Bd3 Bd3 17.Qd3 Rb1 18.Qb1+–) 16.Qb1 Bd7 (16...Qc7 17.Bd3 h6 18.b6+–) 17.Nd4 Ke7 (17...Qa3 18.Qh7 Qc1 19.Ke2 Ne7 20.Bf6 Qc5 21.Qh5 Kf8+–) 18.Qh7 Kd6 19.Be2 (19.Qg8 Nc6 20.bc6 bc6 21.Qf8 Kc7 22.Bf6 Qa1 23.Ke2 Kb7+–) 19...Qa1 (19...Qd8 20.Qf7 Qe8 21.Nf5 Kc7 22.Qd5 Bf5 23.Qf5+–) 20.Bd1 Bg4 21.f3 Be6 22.Qb7 Qa5 23.Qb8 (23.b6!? Bd7 24.Qb8 Ke7+–) 23...Ke7 24.Nc6 (24.Nc6 Kf7 25.Qb7 Ke8 26.Na5+–) 1–0. DEFFM – rigarus, freechess.org, 2018.

5.c4 a3 6.Na3+= d5 7.Nc2 (7.Nb1 dc4 8.Bc4 Nd7+=) 7...Bd6 (7...e4 8.d3+–) 8.Nf3 (8.cd5 Nf6+–) 8...Bg4 (8...Nd7 9.cd5 Ngf6 10.Bc4+=) 9.Be2 (9.h3!? Be6 10.Be5+–) 9...Nd7 10.cd5 Ngf6 11.0–0 0–0 12.d4 (better 12.Nfe1 Be2 13.Qe2 Nd5 14.Qf3+=) 12...ed4 (12...e4 13.Nd2 Be2 14.Qe2 Nd5 15.f3 ef3 16.Qf3+–) 13.Qd4 (13.Bd4 Re8+–) 13...Bf3 (13...Nb6 14.Rfd1+–) 14.Bf3+– (worse 14.gf3 Be5 15.Qb4 Nd5–+) 14...Be5 15.Qb4 Bd6 (15...Re8 16.Rfd1+–) 16.Qc4 (16.Qh4 Ne5 17.Be4 Qd7+–) 16...Ne5 17.Be5 (17.Qe2 Re8+–) 17...Be5 18.Nd4 (18.Rac1 Qd6 19.g3 Nd7+–) 18...Qd6+– 19.g3 Rfe8 (19...Rfd8 20.Rad1+–) 20.a4+– Rad8 (20...Red8 21.Rad1+–) 21.Rad1 (21.a5 Nd5 22.Rfd1 Bd4 23.Rd4 c6+–) 21...b6 (21...Ra8+–) 22.Nc6 Rd7 (22...Ra8 23.Rd2+–) 23.Bg2 (23.Ne5?! Re5 24.Rd3 Rf5+–) 23...g6 (23...h5 24.Bh3 (worse 24.Ne5 Qe5 25.e4 Qe7+–) 24...Ng4 25.Qe4+–) 24.Bh3 (24.Ne5?! Qe5 25.Rd2 Kg7+–) 24...Kg7 (24...Rdd8 25.Nd8 Qd8 26.Bg2+–) 25.f4 Bb2 26.Bd7 Nd7 27.Qc2 Ba3 28.Qc3 Kg8 29.Rd3 (29.f5 Bc5 30.Rf3 gf5+–) 29...Bc5 30.f5 Ne5 31.Ne5 Re5 32.fg6 hg6 33.Kg2 (better 33.Rf3+–) 33...Rd5 (33...Re4+–) 34.Qb3 Rd3 (34...c6 35.bc6 Qc6 36.Rd5+–) 35.Qf7 Kh8 36.Qe8 Kh7 (36...Qf8 37.Rf8 Bf8 38.Qf8 Kh7 39.Qf7 Kh8 40.Qc7 Rd2 41.Kh3 Kg8 42.Qb6 Kf7+–) 37.Rf7 Kh6 38.Qh8 Kg5 39.Qh4 1–0. DEFFM – GuestPNRK, freechess.org, 2018.

5.c4 a3 6.Na3+= Nf6 7.d4+=.

5.c4 Be6 6.Nc3 Nf6 (6...a3 7.Bc1=) 7.Na4+= Be7 8.Nc3 Nbd7 9.Nf3 Nb6 10.d3 0–0 11.Be2 e4 12.Nd4 (better 12.Ne4!? Ne4 13.de4 Bc4 14.Bc4 Nc4 15.Bc3+–) 12...ed3= 13.Ne6?? (better 13.Bd3 Bc4 14.0–0=) 13...de2–+ 14.Nd8 ed1Q 15.Rd1 Rfd8 (worse 15...Rad8 16.Rd4–+) 0–1. GuestKHXJ – Nimzodiac, freechess.org, 2017.

5.c4 Bf5 6.Nc3 a3 7.Bc1 c6 8.Qb3 d5 (8...Nf6!?=) 9.cd5+– cd5 10.Nd5 (10.Qd5 Qd5 11.Nd5 Ra4+–) 10...Be6 11.Bc4 Ne7 12.Nc3 Bc4 13.Qc4 Nd7 14.Qb3 (14.Nf3 Rc8 15.Qd3 Ng6+=) 14...Ng6 (14...Nc5 15.Qb1=) 15.Nf3 Nh4 (15...Nc5 16.Qb1+=) 16.Nh4+– Qh4 17.0–0 Bd6 (17...Nc5 18.Qd5 Qf6 19.d4+–) 18.g3 (better 18.Qd5!? Qe7 19.Qb7+–) 18...Qe7+= 19.Nd5 Qd8 (19...Qe6 20.d3+=) 20.f4 0–0 (better 20...e4!?+=) 21.fe5+– Ne5 22.d4 Ng4 (22...Ng6 23.e4+–) 23.e4 b6 (23...Nh2 24.Rf5 (worse 24.Kh2 Qh4 25.Kg1 Qe4+–) 24...Kh8 25.e5+– (25.Kh2?! Qh4 26.Kg2 Qe4 27.Rf3 Rfc8+–)) 24.e5 (24.h3 Qe8 25.Qd3 f5 26.hg4 fe4 27.Rf8 Bf8+–) 24...Be7 (24...Bb8 25.Rd1+–) 25.Ne7 (25.h3!? Nh6 26.Bh6 gh6+–) 25...Qe7 26.Rf4 (26.h3 Qd7 27.Rd1 Nh6 28.Bh6 gh6+–) 26...Nh6 27.Bd2 Rfd8 28.Bb4 (28.Rc1 Qe6 29.Qe6 fe6+–) 28...Qa7 (28...Qd7!?+–) 29.Raf1+– g5? (better 29...Qa4 30.Qa4 Ra4+–) 30.Rf6 Kg7 (30...Qa4 31.Qc3 Ng4 32.Rf7 Rac8+–) 31.Qf3 Rd4 (31...g4 32.Qf4 Qd7 33.Qh6 Kg8 34.Bd6 Rf8 35.R1f5 Kh8 36.Rh5 Qf5 37.Rff5 Rad8 38.Qh7) 32.Rh6! Kh6 33.Qf6 Kh5 34.Be7 Rg8 35.Qf7 (better 35.Qf3!? Kh6 36.Qf7 Qb8 37.Bf8 Qf8 38.Rf6 Rg6 39.Qf8 Kh5+–) 35...Kh6 1–0. GuestLKNX – Darksmoker, freechess.org, 2017.

5.d4 e4 6.Nd2 d5 7.c4 c6 8.cd5 (8.Ne2 Nf6+=) 8...cd5= 9.Qh5 (better 9.Ne2!?=) 9...Nf6=+ 10.Qg5?? (better 10.Qh4=+) 10...h6–+ 11.Qh4 Be7?? (better 11...g5 12.Qg3 Bd6–+) 12.Ne2?? (better 12.Rc1–/+) 12...Ng4 (12...g5 13.Qg3 Nh5 14.Qe5–+) 13.Qh3 (13.Qh5 g6 14.Qh3 Nf2 15.Kf2 Bh3 16.gh3 Bg5–+) 13...Nf2! 14.Kf2 Bh3 15.gh3 Bh4 16.Ng3 Qf6 (16...f5 17.Be2 Qg5 18.Bc1–+) 17.Kg2 (17.Ke2 0–0 18.Bc3 Rc8–+) 17...0–0 18.Rc1 Rd8 (18...a3 19.Bc3 Bg5 20.Be2 Be3 21.Rhf1–+) 19.Rc3 b6 (19...Nd7!? 20.Be2–+) 20.Be2 Rd6 (better 20...Qg5 21.Rf1–+) 21.Ba3 Re6 (21...Rd7 22.Bg4–+) 22.Rf1 (22.Rc8 Kh7 23.Bg4 Bg3 24.hg3–+) 22...Qg6?? (better 22...Qg5–+) 23.Bh5+– Qg5 (23...Nd7 24.Bg6 Rg6+–) 24.Bf7 Kh8 (24...Kh7 25.Be6 Ra7 26.Rf5+–) 25.Be6 Kh7 (25...Nd7 26.Bd7 Rd8+–) 26.Rf8 h5 27.Bf5 g6 28.Rc7 (28.Rc7 Nd7 29.Ra8 gf5 30.Rd7 Kh6 31.Be7+–) 1–0. DEFFM – GuestBLCM, freechess.org, 2019.

4.e3 b6

5.a4 Bb7 (5...Nf6 6.Nf3=) 6.Nf3 Nf6 7.c4 (7.Bc4 Nbd7=) 7...c5 (7...e4 8.Nd4=) 8.Nc3 Nbd7 (8...Be7 9.Be2=) 9.Be2 (9.d3 Be7=) 9...Be7 10.Qc2 h6 (10...Rc8 11.0–0=) 11.0–0+= 0–0 12.e4 Nh7 (12...Nh5 13.Ne5 Ne5 14.f4+=) 13.d3 (13.Rac1 Nhf6+=) 13...f5 (13...Ng5 14.Nd5=) 14.Nd2 Qe8 (14...Ng5 15.Nd5+=) 15.ef5 Rf5 Black gets the initiative 16.Bf3 (16.d4 Rf4 17.dc5 Nc5+=) 16...Bf3= 17.Nf3 Qh5 (17...Qg6 18.Qe2=) 18.Qe2 Raf8 19.Ne4 (19.Nd5 Bd8 20.Bc1 Rf3 21.gf3 Rf3=) 19...Ng5 20.Nfg5?? (better 20.Neg5 Bg5 21.Nd4=+) 20…Qe2–+ (20...Qe2 21.Ne6 Qb2 22.Nf8 Rf8–+; 20...Rg5?! 21.Rae1 Qe2 22.Re2+=) 0–1. Turczynowicz,Jolanta – Sternik,Ryszard, Olsztyn Poland, 1967.

5.a4 Bd7 6.Nf3 f5 (6...Nf6!?=) 7.Nc3 Nf6 8.Be2 g6 9.d4 e4 10.Nd2 d5 11.Nb3 Bb4 12.0–0 0–0 13.Qd2 Be8 14.Ba3 Ba3 15.Ra3 Nbd7 16.Raa1 Rc8 17.f3 Bf7 18.fe4 Ne4 19.Ne4 de4 20.c4 c5 21.d5 Ne5 22.Rac1 Qd6 23.Qc3 Rfd8 24.Rfd1 h5 25.Qe1 Qf6 26.Qg3 Rd6 27.Bh5 Kf8 28.Be2 Ke7 29.Qh3 (better 29.h3!?+–) 29...Rh8= 30.Qg3 Qh4?? (better 30...Rc8!?=) 31.Qh4 (better 31.Qe5 Kd7 32.Rf1+–) 31...Rh4+– 32.g3 Rh6 33.Rf1 Kf6 34.g4 Rh3 35.Kg2?? (better 35.Rc3+–) 35...Re3–/+ 36.g5? (better 36.Bd1–/+) 36...Kg5–+ 37.Nc5 (37.Bd1–+) 37...Re2 38.Rf2 Rf2 (38...bc5?! 39.Re2 Kf6 40.h4–+) 39.Kf2 bc5 40.Rg1 (40.Ke3–+) 40...Kf6 41.h3 Nd3 (better 41...Nc4 42.Ke1–+) 42.Ke3 Nb2 43.Ra1 (43.Rc1 Ke5 44.Ke2 Kd4–+) 43...Nc4 44.Kf4 Rd5 45.h4 Nb6 (45...Rd3 46.Rf1 Nb6 47.h5 g5) 46.Ra3 Rd3 47.Rd3 ed3 48.Ke3 (48.Ke3 c4 49.Kd2–+). Atotheking (1700) – lucia18 (1680), lichess.org, 2020.

5.c4 Bb7 6.a4 Nf6 7.Nf3 Be7 8.d4 Nbd7 (8...0–0 9.Nc3=) 9.Nc3 0–0 10.Be2 Re8 11.0–0 Bf8 (11...g6 12.Qc2=) 12.Qc2 (12.h3 g6=) 12...ed4 (12...g6 13.Rfd1=) 13.Nd4 Nc5 14.Nc6 Bc6 15.bc6 Qe7 (15...g6 16.Rfd1+=) 16.Nb5 Rac8 17.Bf6 Qf6 18.Bg4 Ne6 19.f4 g6 (better 19...Qh4!? 20.Qd1 g6+–) 20.f5+– gf5 21.Bf5 Qh6 (better 21...Qg7!?+–) 22.Rf3 Kh8 (22...Bg7 23.Rg3+–) 23.Raf1 Nc5 (23...Qf6 24.Be4 Qg5+–) 24.Rh3 Qh3 (24...Ne6 25.Be6 Re6 26.Rh6 Bh6 27.Rf7+–) 25.Bh3 (25.Bh3 Ne6 26.Be6 fe6 27.Rf7+–) 1–0. guestxthg – guestkuhv, private online chess game, 2018.

5.c4 Bb7 6.a4 Qg5 7.Nc3 Bg2 8.h4 Qg6 9.h5 Qg5 10.Nf3 Bf3 (10...Qg4 11.Bg2 Qg2 12.Rg1=) 11.Qf3 Ra7 12.Bh3 Nf6 13.0–0–0 Nbd7? (better 13...Qh6=) 14.h6!+– gh6? (14...Qh6 15.Bd7 Double attack (15.Bd7 Decoy); 14...gh6 15.Rdg1 Combination) 15.Rdg1 Qh5 (15...Ng4 16.Bg4 Nc5+–) 16.Bd7 Kd7 17.Rh5 Nh5 18.Qf7 (18.Qf7 Kd8 19.Qh5+–) 1–0. Janek – Belpdi, internet, 2019.

5.c4 Bb7 6.Nf3 Nd7 7.Nc3 Ngf6 8.Be2 Be7 9.Qc2 c5 10.0–0 h6 11.Nh4 Bf8 12.Nf5 Qc7 13.Qd1 0–0–0 14.Bf3 g6 15.Ng3 Re8 16.Nce4 ½–½. Olsen,B (1690) – Mann,D (1740), TCh–Eur Seniors, Dresden GER, 2010.

5.c4 Nd7 6.Nf3 Nc5 (6...e4!? 7.Nd4 Ne5+=) 7.d4+/– ed4 8.Nd4 (8.ed4 Nd7+=) 8...Ne6 (8...Bb7 9.Nc3+=) 9.Be2+/– Nf6? (9...Nd4 10.Bd4 Nf6 11.Bf3+/–) 10.0–0 (10.Bf3 Bd7 11.Ba8 Qa8+–) 10...Be7? (better is 10...Nd4!? 11.Bd4 Be7+/–) 11.Nc6 Qd7 12.Bf3 (12.Ne7?! Qe7 13.Nc3 0–0+=) 12...Ng5?? (better is 12...Bb7 13.Ne7 Bf3 14.Qf3 Ke7 15.Bf6 gf6+–) 13.Ne7 (13.Ne7 Nf3 14.Qf3+–) 1–0. carocan (1830) – marianbc1974 (1605), kurnik, 2011.

5.d3 Bb7 6.c4 Nd7 7.Nc3 Ngf6 8.Nf3 Qe7 (8...d5 9.cd5 Nd5 10.Nd5 Bd5 11.Ne5 Ne5 12.Be5 Bb4 13.Ke2=) 9.Be2+= 0–0–0 (9...d5 10.cd5 Nd5 11.Nd5 Bd5 12.e4+=) 10.e4 Nc5 11.0–0 h6 12.Ba3 (12.Nd5 Qe6+=) 12...Nfd7 (12...g5 13.Nd5 Nd5 14.cd5+=) 13.Nd5 Qe8 14.Nh4 g6 15.Bg4 Kb8 16.Bd7 (16.f4 Bg7+=) 16...Nd7 (16...Qd7 17.Rb1=) 17.d4 (17.f4 Bg7+=) 17...Bg7 (17...ed4 18.Re1=) 18.Bb2 ed4 (18...Qe6 19.f4=) 19.Bd4 Bd4 (19...Be5 20.f4 Bd4 21.Qd4+=) 20.Qd4+= Qe5 (20...Qe6 21.Nf3+=) 21.Nf3 Qh5 22.Rfe1 g5 23.Qc3 g4 24.Nd4 Qe5 25.Rac1 Rde8 26.Re3 h5 27.Rce1 h4 28.Qd2 Nc5 29.Nc6 Bc6=+ 30.bc6 g3 31.f4 gh2=+ 32.Kh2 Qg7 33.Rb1 Kc8 34.Nb6? cb6–+ 35.Rb6 Rhg8 36.Re2 Qg3 37.Kg1 Qd3 38.Qb2 Kd8 39.Rb7 Nb7 40.Qb7 Rg2 41.Rg2 Qe3 ½–½. Sternik,Ryszard – Trusewicz, corr Poland, 1994.

5.d3 Nf6 6.Be2 =.

5.d4 e4 6.c4 c5 (6...Nf6!?+=) 7.dc5+– dc5 8.Qd8 Kd8 9.Nh3 (9.Nd2 Bb7+–) 9...h6 (9...Bh3!? 10.gh3 Nd7+=) 10.Nc3 f6? (better 10...Bh3!? 11.gh3 f5+–) 11.Nf4+– Bf5 12.g4! Bg4 (12...Bh7+–) 13.Ng6 (13.Ne4?! Bf3 14.Bg2 Bg2 15.Rd1 Nd7 16.Ng2 Kc7+–) 13...Bf3 14.Rg1 Ne7 (14...a4 15.Nh8 a3 16.Bc1+–) 15.Nh8 Nd7 (15...g5 16.Bg2 Bg2 17.Rg2+–) 16.Nf7 Kc7 17.Be2 g5 18.Bf3 (18.Rd1 Bg7+–) 18...ef3 19.0–0–0 Ne5 (19...Bg7 20.Rd6 a4 21.Rgd1+–) 20.Ne5 fe5 21.Rg3 a4 (21...Bg7 22.Rf3 Rf8 23.Rf8 Bf8 24.Nd5 Nd5 25.Be5 Kc8 26.Rd5+–) 22.Rf3 a3 23.Nd5 Nd5 24.Be5 Kb7 (24...Kd7+–) 25.Rf7 Be7 26.cd5 (26.cd5 Rc8 27.Re7 Ka8 28.Rd3 Rc7 29.Ra3 Kb8 30.Bc7 Kc8 31.Bd6 g4 32.Ra8) 1–0. michaelbuss (2805) – chymara, ChessWorld.net, 2012.

5.Nf3 Bb7 6.Be2 Nf6 7.c4 Nbd7 8.d4 ed4 9.ed4 Be7 (9...d5 10.0–0=) 10.0–0 0–0 11.Nbd2 Ne4 (11...d5 12.Ne5=) 12.Ne4+= Be4 13.Nd2 Bg6 14.Bf3 Rb8 15.Ne4 (15.Bc6 Re8+–) 15...Nf6 (15...Re8 16.Re1+=) 16.Re1 Ne4 17.Be4 (worse 17.Re4 Be4 18.Be4 Bg5=+) 17...Be4 18.Re4 Bf6 19.Qc2 (19.Qh5 Re8 20.Rae1 Re4 21.Re4 d5 22.Qd5 Qd5 23.cd5 Rd8+=) 19...Re8 20.Rae1 Re4 21.Qe4 Qd7 22.h3 g6 23.Qf3 Bg7 24.Qe2 Kf8 25.Rd1 (25.d5!?+=) 25...Re8= 26.Qc2 Qe7 27.Bc1 (27.Qb3 Qe2 28.Bc3 Re4=+) 27...Qe4 (27...Bd4!? 28.Rd4 Qe1 29.Kh2 Qe5 30.Rf4 g5–/+) 28.Qe4= Re4 29.Be3 f5 30.Kf1 f4 31.Bc1 g5 (31...Bd4? 32.f3 Re5 33.Rd4+–) 32.Bb2 a4 33.f3 Re3 34.Kf2 a3 35.Bc1 (better 35.Ba1=) 35...Rc3–/+ 36.d5? (36.h4!?–/+) 36...Rc4 (36...Rc2!? 37.Kf1 Ra2 38.Ba3 Ra3 39.Rc1–+) 37.Ba3 Rc2 38.Kf1 Ra2 39.Bc1 Rc2 40.g3 Be5 41.gf4 gf4 (41...Bf4?! 42.Bf4 gf4 43.Rd4=+) 42.Ke1 Rh2 43.Rd2?? (43.Bd2 Rh3 44.Ke2 Rh2 45.Kd3 Ke7–+) 43...Rh3 (better 43...Rh1 44.Ke2 Rc1–+) 44.Rf2 Rh5 45.Ke2 (45.Rc2 Rh1 46.Ke2 Rh2 47.Kd3 Rc2 48.Kc2 Kf7–+) 45...Bd4 46.Rg2 Rd5 47.Bf4 Rb5 48.Bd2 Rb3 49.Rh2 Kg7 50.Kd1 (50.Rg2 Kh8–+) 50...Rf3 51.Rg2 Kf7 52.Re2 (52.Rh2 Kg8–+) 52...h5 53.Kc2 (53.Bg5 c6–+) 53...c5 54.Rh2 Rf5 55.Rh1 b5 0–1. GuestYTSB – GuestYFTT, freechess.org, 2017.

5.Nf3 Be7 6.c4 Nf6 7.Be2 Bb7 8.d4 e4 9.Nfd2 d5 10.Nc3 Bb4 11.Nd5 (11.0–0 0–0+=) 11...Nd5 12.cd5 Bd5 13.a3 Bd6 (13...Bd2 14.Qd2 0–0 15.0–0=) 14.Qc2+= Qe7 15.Bc4 Bb7 16.d5 Be5? (better 16...f5!?+=) 17.Be5+– Qe5 18.Qe4 Nd7 19.0–0 (19.Qe5 Ne5 20.e4 0–0–0+–) 19...0–0 (19...f5 20.Qd3+–) 20.Rac1 (20.Qe5 Ne5 21.e4 Rad8+–) 20...Qb2 21.Nb1 Nf6 22.Qf3 Qe5 (22...Rfe8 23.Rcd1+–) 23.Nc3+– Rad8 24.e4 Rfe8 25.Bd3 Re7 26.Rc2 Bc8 27.Qg3 Qg3 28.hg3 Nd7 29.Na4 Ne5 30.Be2 Bg4 (30...Ng6 31.f3 Bb7 32.Rfc1+–) 31.f3 Bc8 (31...f5 32.fg4 fe4 33.Nc3+–) 32.Rfc1 Rdd7 (32...f5+–) 33.Nb6 Ng4 (33...Rd8 34.Nc8 Rc8 35.b6+–) 34.Nc8 Re6 (34...Re8 35.fg4 Rc8+–) 35.de6 Rd1 36.Rd1 g5 37.ef7 Kg7 38.f8Q! Kf8 (38...Kf8 39.Rc7 Mate attack) 39.Rc7 Nf2 (39...Nf6 40.Rd8 Ne8 41.Nd6 h5 42.Re8) 40.Rd8 1–0. GuestRVNG – GuestTMWP, freechess.org, 2018.

5.Nf3 Ne7 6.d4 e4 7.Nfd2 d5 8.c4 Be6 9.c5?? (better is 9.Nc3+/–) 9...Nd7 10.Qc2 (10.c6 Nf6+=) 10...Rc8 (10...bc5!? 11.dc5 Nf5–/+) 11.c6 Nf6 12.Be2 Nf5 13.Ba3 Ba3 14.Na3 Nd6 15.Qb2 0–0 16.Nc2 Qe7 17.h3 Nfe8 18.0–0–0 (18.0–0 Qg5 19.Kh2 Nf5–/+) 18...f5 19.g3 Nf6 20.Ne1 Kh8 21.Ng2 Rcd8 22.Kb1 a4 23.a3 Ra8 24.Ka1 Ra5 25.Rb1 Nfe8 26.Qb4–/+ Qf7 27.Nf4 g5 28.Bh5 Qe7–/+ 29.Ne6 Qe6 30.Be2 f4 31.gf4 gf4 32.Bg4 Qh6–+ 33.Rhg1 Nb5 34.Bd7 Qd6 35.Qd6 Nbd6 36.Rbc1 Ra8 37.Rg5 fe3–+ 38.fe3 Rf2 39.Nf1? b5?? 40.Rd5+= b4 41.Rd6?? b3–+ 42.Rb1 Ra2# 0–1. Wahlberg,Jockum – Escofet Llongueras,Joan (1885), 7. Gibtelecom Masters, 2009.

5.Nf3 Nf6 6.Be2 Be6 7.Ng5 Bd5 8.0–0 Be7 (8...h6 9.Nf3+–) 9.c4 (9.Nc3 Bb7 10.f4 ef4 11.Rf4 0–0+=) 9...Bb7 10.d4 ed4 11.Bf3 Bf3 12.Qf3 (worse 12.Nf3 de3 13.fe3 Nbd7=+) 12...Nbd7 (12...d5 13.ed4 h6 14.Nh3+–) 13.ed4+– 0–0 14.Re1 h6 15.Nh3 Re8 16.Nc3 Nf8 (16...g5 17.Qd3+–) 17.Nf4 Qd7 18.Re2 Qg4? (better 18...Ne6 19.Ncd5 Nd5 20.Nd5 Ng5+–) 19.Qg4+– Ng4 20.Rae1 Ne6 21.Ne6 fe6 22.Re6 Kf7 23.Nd5 Rac8 (23...Bh4 24.Re8 Re8 25.Re8 Ke8 26.Nc7 Kd7+–) 24.Re7 Re7 25.Re7 (25.Re7 Kf8 26.Ba3+–) 1–0. GuestKKPB – GuestXWYX, freechess.org, 2019.

5.Nf3 Nf6 6.Be2 Be7 7.c4 Be6 (7...c6 8.Nc3=) 8.0–0+= 0–0 9.d4 ed4 10.Nd4 Nbd7 (10...Qd7 11.Qd3+=) 11.Nc6+– Qe8 12.Nd2 (12.Nc3 Ne5 13.Nd5 Bd5 14.cd5 Nc6 15.dc6 Ne4+–) 12...Nc5 (12...Rc8 13.Bf3+=) 13.Bf3 Rc8 14.Qc2 Nfd7 15.Na7 (15.Rfd1 Bf6+=) 15...Rb8 (15...Rd8 16.Bd4+=) 16.Nb3 Nb3 17.ab3 Nc5 (17...Bf6 18.Bf6 Nf6 19.Nc6+–) 18.Nc6 Rc8 19.b4 (worse 19.Ne7 Qe7 20.Qc3 Qg5+=) 19...ab4 20.Nb4 Bd7 (20...Bd8 21.Ra7+–) 21.Nd5 (21.Ra7 Qd8+–) 21...Qd8 22.Ra7 Be6 (22...Re8 23.Rfa1+–) 23.Bd4 Bd5 24.Bd5 Bf6 (24...Ne6 25.Bb7 Rb8 26.Be4+–) 25.Bc5 (25.Qf5 Bd4 26.ed4 Nb3+–) 25...bc5+– 26.g3 (26.Qf5 Be5+–) 26...Re8 (26...Rb8 27.Rb1+–) 27.b6 c6?? (better 27...Re7+–) 28.Bf7+– Kh8 29.Be8 Qe8 30.b7 Rb8 31.Rb1 Qd7 (31...Kg8+–) 32.Ra8 Qc7 33.Rb8 Qb8 34.Qf5 (34.Qf5 Kg8 35.Qc8 Kf7 36.Qb8+–) 1–0. GuestQWJK – GuestYKVW, freechess.org, 2018.

5.Qf3 Ra7

6.Nc3 Nf6 7.Bc4 Bb7 8.Qg3 Nh5 9.Qh3 g6 (9...Nf6 10.Nf3=) 10.Nf3 Bg7 11.g4 Nf6 12.g5 Nh5 13.Qg4 0–0 14.Bd5 Bc8 (14...Bd5 15.Nd5 c6 16.bc6 Nc6 17.Qc4=) 15.Qc4+= Bg4?? (better 15...Bb7+=) 16.Qg4+– Nd7 17.Ne4 Kh8 18.Qh4 (18.Ng3 f5 19.Qh4 e4+–) 18...f6 19.d3 fg5 20.Nfg5 Nc5 (20...Qe7+–) 21.Nf7 Kg8 (21...Rf7 22.Qd8 Rf8+–) 22.Ne5 Kh8 23.Nf7 Kg8 24.Nd8 Kh8 (24...Ne6 25.Be6 Rf7 26.Qe7 Bc3 27.Bc3 Nf6 28.Qf7 Kh8 29.Bf6) 25.Qe7 Ne4 (25...Nf6 26.Bf6 Nd3 27.cd3 Rf6 28.Nf6 Bf6 29.Qf6) 26.Bg7 (26.Bg7 Ng7 27.Qf8; 26.Qf8) 1–0. Rosner,Dirk (2175) – Tortoza,Carlos, CiF, 2006.

6.Bc4 Nf6 7.Nc3 Bb7 8.e4 c5 9.Nge2 Be7 10.0–0 0–0 11.Ng3 g6 (11...a4 12.Nf5+=) 12.d3 (12.a4 Qd7+–) 12...Bc8 (12...a4 13.a3+–) 13.Nge2 (13.Qe3 a4+–) 13...Be6 (13...a4 14.a3+–) 14.Be6+– fe6 15.Qh3 Qd7 16.f4 ef4 17.Nf4 (worse 17.Rf4 e5 18.Rf3 Qh3 19.Rh3 c4+=) 17...e5 18.Ne6 Rf7 19.Nd5 Nd5?? (better 19...a4+–) 20.Rf7+– (20.ed5?! Bf6 21.c4 a4+–) 20...Kf7 (20...Nf6 21.Rg7 Kh8 22.Rf1+–) 21.Qh7 (21.ed5?! h5 22.Qe3 g5+–) 21...Ke6 22.ed5 Kd5 (22...Kf6 23.Rf1 Qf5 24.Rf5 gf5+–) 23.Qf7 Qe6 24.c4 1–0. DEFFM – GuestYYVD, freechess.org, 2018.

6.Bc4 Nf6 7.Nc3 Bb7 8.e4 c6 9.bc6 Bc6 10.Qd3=.

6.Bc4 Nf6 7.Nc3 Bb7 8.e4 Be7 9.Nge2 0–0 10.0–0 Nbd7 11.Ng3 h6 (11...Nc5!?+=) 12.Nf5+– Kh7 13.Rad1 (13.Qe3 Nc5 14.d4 ed4 15.Qd4 Nh5+– (15...Nce4? 16.Nd5 Bd5 17.Bd5+–)) 13...g6+= 14.Ne7 Qe7 15.d3 Kg7 (15...Nc5 16.Qe3+=) 16.Bc1 Raa8 17.Qh3 Rh8 18.f4 Bc8 19.f5 g5 20.Qg3 Kf8 (20...Bb7 21.Bd2+–) 21.Bb2 (better 21.h4!? gh4 22.Qh4 Bb7+–) 21...Bb7+– 22.Rf2 (22.Qe3 Nc5+–) 22...Nh5 23.Qf3 Nhf6 24.Re1 h5 Black prepares g4 25.Bc1 (25.Qg3 Rg8+–) 25...g4 26.Qe2 Rg8 (26...h4 27.Bg5+–) 27.Bh6 Ke8 28.Qd2 Kd8 (28...h4 29.Bg5 h3 30.Bd5+–) 29.Bg5+– c6 (29...Kc8!?+–) 30.bc6 Bc6 31.Bd5 Rg5 (31...Kc7 32.Rb1 Rg5 33.Qg5+–) 32.Bc6 Rc8 33.Qg5 Rc6 34.Nb5 Rc5 (34...Ke8 35.c4+–) 35.c4 Kc8 (35...Rc6 36.Rd2+–) 36.Rb1 Kb7 37.Rfb2 Rc6 38.Qd2 Ka6 (38...h4 39.Nc3+–) 39.Nc3 Qd8 40.Na4 Qb8 (40...h4 41.Rb5+–) 41.Rb5 Nc5 (41...Kb7+–) 42.Ra5! Kb7 (42...ba5 43.Nc5 Double attack (43.Rb8 Pinning; 43.Rb8 Deflection; 43.Rb5 Decoy; 43.Rb8 Clearance)) 43.Nb6! Rb6 44.Rb6 Kb6 45.Rb5 Kc7 46.Qa5 Kc8 47.Rb8 Kb8 48.Qd8 Kb7 49.Qf6 Nd3 50.Qd6 Nf4 51.Qe5 Ne2 52.Kf2 Nc1 53.Qb2 (53.Qb2 Kc6 54.Qc1+–) 1–0. DEFFM – GuestVGBM, freechess.org, 2019.

6.Bc4 Nf6 7.Qd1 Bb7 8.Nf3 Nbd7 9.0–0 Be7 10.Be2 0–0 11.c4 Nc5 (11...c5 12.bc6 Bc6 13.Nc3=) 12.d4+= ed4 13.ed4 Nce4 14.Qc2 d5 15.Nbd2 Re8 16.Ne5 Nd2 17.Qd2 Bb4 18.Qc2 Ne4 19.a3 Bd6 20.Nc6 (20.Rfe1 Qh4 21.Bf3 f5+=) 20...Bc6= 21.bc6 dc4 (better 21...Qg5=) 22.d5?? (22.Bc4 Qg5+=) 22...Qh4 (better 22...c3 23.Bc1 Qe7–/+) 23.g3= Ng3 (better 23...Qg5!? 24.Bc4 Nd2=) 24.fg3+– Bg3 25.Bc4 (25.hg3?! Qg3 26.Kh1 Qh3 27.Kg1 Qg3 28.Kh1 Qh3 29.Kg1 Qg3=) 25...Bh2 (25...Re3!? 26.Rf2 Bf2 27.Qf2 Qg4 28.Qg2 Qg2 29.Kg2 Ra8+=) 26.Qh2+– Qc4. GuestGDVQ – GuestPNFN, freechess.org, 2017.

6.Bc4 Nf6 7.d4 e4 8.Qd1 d5 9.Bf1 Bd6 10.a4 0–0 11.Nd2 Be6 12.Nb3 Qe7 13.Rc1 c6 14.bc6 Nc6 15.c3 Rc7 16.h3 Bd7 17.Nd2 Rfc8 18.Qb3 Rb8 19.Ra1 Na7 20.c4 dc4 21.Bc4 b5 22.ab5 Bb4 (better is 22...Bb5!? 23.Bc3 Rbc8–+) 23.Ba3+= Rc4 24.Qc4 Ba3 25.Qc7 Ra8 26.Qb7 Rc8 27.Qa7 Bb4 28.Ne2 Bd2 29.Kf1 Qd6 30.b6 Rb8 31.b7 Bc6 32.Rd1 Rb7 33.Qa6 Bb4 34.Rc1 Rc7 35.Kg1 Nd5 36.g3 Qd7 37.Nf4 Nf4 38.gf4 Bb7 39.Qf1 h6 40.Kh2 Rc1 41.Qc1 Bc8 42.Qf1 a4 43.Rg1 Qf5 44.Rg3 Be6 45.d5 Qd5 46.Qa1 Bf8 47.Qa4 h5 48.Qa1 Qf5 49.Qf1 g6 50.Qg2 Be7 51.Qf1 Bh4 52.Rg1 Bf2 53.Rg5 Qh3! 54.Qh3 Bh3 55.Kh3 Be3 56.Kg3 Bd2 57.Re5 e3 58.Kf3 Kg7 59.Kg3 Be1 60.Kf3 Bf2 61.Re8 Kf6 62.Re4? g5 63.fg5 Kg5 64.Re5 Kg6 65.Re8 h4 66.Kg4 Kg7 67.Re4 f5! 68.Kf5 h3 69.Re7 Kf8 70.Rh7 e2 71.Kf6 Bd4 72.Kg6 e1Q (72...e1Q 73.Rh8 Bh8 74.Kg5 h2 75.Kg4 Qe4 76.Kg5 Kf7 77.Kh5 h1Q 78.Kg5 Bf6) 0–1. Larios Villa (1945) – Alvarez Dominguez, Mondragon Arrasate Hiria op 8th, 2008.

4.e3 c5

5.c4 b6 6.Qc2 Nf6 7.Nf3 Be7 8.Bd3 (8.d4 cd4 9.ed4 e4=) 8...Bb7 9.Nc3 Nbd7 10.0–0 0–0 11.Ne4 (11.Ng5 g6=) 11...Re8 12.Nfg5 Ne4 (12...h6 13.Nf3=) 13.Be4+= Be4 14.Ne4 (14.Qe4? Bg5 15.d3 Qe7–+) 14...f5 (14...Nf6 15.Nf6 Bf6 16.Qe4+=) 15.Nc3 g6 16.f4 Bf6 17.Nd5 Bg7 (17...e4 18.Rad1+=) 18.e4+– fe4 19.Rae1 (19.Qe4?! ef4 20.Qc2 Bb2 21.Qb2 Qg5=) 19...ef4 (19...Nf6 20.Nf6 Bf6 21.Qe4+=) 20.Bg7 Kg7 21.Qc3 Kg8 22.Rf4 (22.Nf4?! Qg5=) 22...Qg5 23.Qh3 Ra7 (better 23...Rad8!?+=) 24.Ref1 Rf8?? (better 24...Kh8+–) 25.Qe6 Kg7 26.Rf7 (26.Rf7 Kh6 27.Ne3 Rf7 28.Rf7+–) 1–0. GuestWTJX – GuestYPKM, freechess.org, 2019.

5.c4 b6 (5...Nf6 6.d4 ed4 7.ed4 cd4 8.Bd4=) 6.Nc3 Be6 (6...Nf6 7.Be2+=) 7.Qc2 (7.Nf3 Nf6+=) 7...g6 (7...Nd7 8.Bd3+=) 8.0–0–0 (8.Be2 Bg7+=) 8...f5 (8...Bg7 9.Nf3+=) 9.f4 Nd7 (9...Bg7 10.Nf3+=) 10.Nf3 (10.g3 Ngf6+=) 10...Be7 (10...Ngf6 11.Re1+=) 11.Ne2 (better 11.h4+=) 11...e4? (better 11...Bf6+=) 12.Bh8+– Qc7? (12...ef3 13.gf3 Bf6 14.Bf6 Ngf6+–) 13.Ng5 Bg5 14.fg5 h5 (14...Ne5 15.Nf4 Qe7 16.Qc3+–) 15.Nf4 Kf7 (15...Bf7 16.d3 ed3 17.Qd3+–) 16.Qc3 (16.Qc3 Ne5 17.d4 ed3 18.Nd3 Nd3 19.Bd3+–; 16.d3 Ne7 17.Bf6 ed3 18.Bd3 Ne5+–) 1–0. Kuhlmann – Herzog, 1971.

5.c4 Be6 6.Nc3 (6.d4 Nd7=) 6...Nf6 7.Nf3 h6 8.d3 (8.d4 ed4 9.ed4 Qe7=) 8...g6 (8...Be7 9.Be2=) 9.Be2 Bg7 10.0–0 0–0 11.Nd2 Nbd7 (11...d5 12.cd5 Nd5 13.Nc4=) 12.Bf3 Qb8 13.Qc2 Nb6 14.Rad1 (14.a3 Qc7+=) 14...h5 (14...Qc7 15.a3+=) 15.a4 (15.Nde4 Ne4 16.Ne4 Qd8+=) 15...g5 (15...Qc7 16.Be2+=) 16.Nce4+– g4 (16...Ne4 17.Ne4 g4 18.Be2+–) 17.Be2 (17.Nf6 Bf6 18.Be2 Bg7+–) 17...Nh7 (17...Ne4 18.Ne4 f5 19.Ng5+=) 18.Ng3 h4 19.Nh5 Bh6 20.d4 f6?? (better 20...f5 21.de5 de5+–) 21.Qg6+– Kh8 22.Qh6 Rg8 (22...Rf7 23.d5 Bd7+–) 23.Bd3 e4 (23...f5 24.Qe6 Na4 25.Qf5 Qc7 26.de5 d5+–) 24.Be4 Qc7 25.dc5 Qf7 26.Bf6 Rg7 27.Qh7 1–0. DEFFM – GuestCMCP, freechess.org, 2020.

5.bc6 Nc6 6.Bb5 f5 7.Bc6 bc6 8.Qh5 g6 9.Qe2 Bg7 10.Qc4 Qc7 11.Nf3 d5 12.Qa4 Ne7 13.Ng5 0–0 14.0–0 h6 15.Nf3 Kh7 16.d3 Ba6 17.Nbd2 e4 18.Bg7 Kg7 19.Qd4 Kh7 20.Ne1 c5 21.Qb2 Rab8 22.Qc1 Nc6 23.de4 Bf1 24.Nf1? fe4–+ 25.h3 Qd8 Black prepares d4 26.Qd2 d4 27.Ng3 Qh4 28.Ne4? Qe4 29.Nf3 Rf3 30.gf3 Qf3 31.ed4 Nd4 32.Re1 Rb7 33.Re3 Rb1 34.Re1 Qh3 35.Rb1 Nf3 0–1. wojtekkk – mors32 (1735), kurnik, 2011.

5.d4 cd4 6.ed4 e4 7.d5 =.

5.d4 Qe7 6.de5+= de5 7.Nf3 f6 (7...Nd7 8.Be2=) 8.Bc4 (8.Nc3 Bg4+=) 8...Be6 9.Be6 Qe6 10.Nc3 Bd6 (10...Ne7 11.0–0+=) 11.Ne4 (11.Qd3 Nh6+=) 11...Be7 12.0–0 Nh6 (12...Nd7 13.Qd2+=) 13.Qe2 (13.Nc3 Nd7+=) 13...Nd7 14.Rfd1 Nb6 15.Ba3 (15.Nfd2 0–0+=) 15...Rc8 16.Rd3?? (16.Bb2 0–0=) 16...0–0 (16...f5 17.Neg5 Qg6 18.e4–+) 17.Qe1 (17.Rc3 Qd5 18.Ng3 e4=+) 17...Nc4 (17...f5 18.Neg5 Qg6 19.Nh7 Qh7 20.Qa5 Nc4–/+) 18.Rad1? (18.Rc3 Rfd8 19.Qe2 Na3 20.Ra3 c4=+) 18...Na3?? (better is 18...f5 19.Ned2 Na3 20.Ra3 e4–+) 19.Ra3= b6 20.Qe2 Nf7 (20...Rfd8 21.Rd2=) 21.c4 f5 22.Nc3 e4 23.Ne1 Ne5 24.Nd5 Bf6 25.Qc2 Rf7 26.Nf6 (26.f3 ef3 27.Nf3 Re8=) 26...Rf6 27.Rd5 ½–½. Borrmann,F – Moebius,M, CiF, 1992.

4.e3 c6

5.a3 Bd7 6.a4 (6.d4 e4=) 6...b6 (6...Nf6 7.Nf3=) 7.Nf3 (7.d4 Qc7=) 7...c5 (7...Nf6 8.bc6 Nc6 9.Bb5=) 8.c4 (8.Bc4 Nf6+=) 8...Be7 (8...Nf6 9.Nc3=) 9.Nc3 Nf6 10.Be2 Be6 (10...0–0 11.0–0=) 11.Ng5 Bd7 (11...0–0 12.Bf3 Ra7 13.Ne6 fe6 14.0–0+=) 12.0–0 h6 (12...0–0 13.f4+=) 13.Nge4 (13.Bf3 Ra7 14.Nge4 Be6+=) 13...Be6 (13...Ne4 14.Ne4 0–0 15.d4 ed4 16.ed4+–) 14.f4 (14.Bf3 Ne4 15.Be4 Ra7+–) 14...ef4 15.Rf4 0–0 16.Qc2 Qd7? (better 16...Nbd7+–) 17.Raf1 (better 17.Nf6 gf6 18.Bf3+–) 17...Nh5 1–0. GuestRXPW – NAPSC, freechess.org, 2016.

5.a3 Nf6 6.Be2=.

5.a4 cb5 6.ab5 b6 7.Qf3 Ra7 8.d4 Bb7 9.Qg3 Nf6 (9...e4 10.c4=) 10.de5+= Ne4 11.Qg4 (11.Qf4 Nd7 12.Nf3 Qc7+=) 11...de5= 12.Be5 Bb4 (12...Nd7!? 13.Bd4 Ndf6+=) 13.c3+– Bf8 14.Ra4 (14.Bg7 Rg8 15.Ra4 Nd6–+ (15...Rg7?! 16.Re4 Be4 17.Qe4 Qe7 18.Qa4=)) 14...Nf6 15.Qg3 Ne4 16.Qf4 Nc5?? (16...Nd7 17.Bc4 f6=) 17.Bb8+– Na4 18.Ba7 Nc3 (18...Nc5+–) 19.Qe5 Be7 20.Qc3 (better 20.Nc3 h5 21.Nge2+– (21.Qg7?! Bf6 22.Qh8 Bh8=)) 20...0–0?? (better 20...Bb4 21.Ne2 Qd3 (21...Bc3?! 22.Nbc3 a4 23.Na4=+) 22.Qb4 ab4–+) 21.Qc1 (21.Qd4 Bb4 22.Nd2 Qa8 23.Qb6 Rd8 24.Qd8 Qd8+=) 21...Bb4 22.Nd2 Qe7 (22...Qf6 23.Ne2 Rc8+–) 23.Bb6 Rc8 24.Qb2 Qd6 25.Bd4 Bd5 (25...Qg6 26.Ngf3 Bf3 27.gf3 Rc2+–) 26.Ne2 a4 27.Bg7 (better 27.Nc3 a3 28.Qa1 Bb7+–) 27...a3 28.Qd4 Rc4 29.Qe5 Bd2 (29...Qe5 30.Be5 Rc2 31.f3+–) 30.Kd2 Qb4 31.Nc3 (31.Nc3 Qb2 32.Kd3+–) 1–0. DEFFM – GuestWBQM, freechess.org, 2018.

5.a4 cb5 6.ab5 b6 7.Nf3 Nd7 8.Bc4 h6 (8...Ngf6 9.e4=) 9.d4 (better 9.e4+=) 9...e4 (better 9...Bb7!?+=) 10.Bd5+– Rb8 (10...Ra7 11.Be4 Ngf6 12.Bc6+–) 11.Be4 Ngf6 12.Bc6 Bb7 (12...d5 13.Nc3 Bb4 14.0–0+–) 13.0–0 (13.d5 Be7+–) 13...Bc6? (better 13...d5+–) 14.bc6 1–0. DEFFM – Cakirk, freechess.org, 2018.

5.a4 Qb6 6.Nf3 Nf6 7.c4 Be7 8.Be2 Be6 9.d4 e4 10.Ng5 (10.Nfd2 0–0=) 10...Bf5 11.0–0 h6 12.Nh3 Bh3 13.gh3 d5 14.Qb3 0–0 (14...Qc7 15.bc6 bc6 16.cd5 cd5 17.Rc1=) 15.Nc3 cb5 16.Nb5 dc4 17.Bc4 Nc6 18.d5 Nb4 19.Kh1 Nd7 20.Rg1 Bf6 21.d6 Bb2 (better 21...Qd8!?=) 22.Qb2+= Nd3?? (better 22...g5+=) 23.Qg7 1–0. DEFFM – GuestHMQX, freechess.org, 2017.

5.a4 c5 6.Nc3 b6 (6...Nf6 7.e4=) 7.Bc4 (7.d4 ed4 8.ed4 Qe7 9.Be2 Bb7+=) 7...Nf6 8.Qf3 Ra7 9.Nge2 Bb7 (9...Be7 10.e4+=) 10.Nd5 (10.e4 Nbd7+=) 10...Nd5 (10...Nbd7 11.Nec3+=) 11.Bd5 Bd5 12.Qd5 Be7 (12...Nd7 13.f4+=) 13.f4 (13.0–0 Nd7+=) 13...0–0 (13...Bh4!? 14.g3 Bf6+=) 14.fe5+– Rd7 15.e6 fe6 16.Qe6 Kh8 17.Rf1 Rf1 18.Kf1 Qf8 (better 18...d5!?+–) 19.Kg1+– Qg8 20.Qh6 d5 (20...Bf6 21.Bf6 gf6 22.Qf6 Qg7 23.Rf1 Qf6 24.Rf6+–) 21.Nf4 (better 21.Qb6 Bd6 22.Rf1+–) 21...d4?? (better 21...Rd6 22.Qh5 Nd7+–) 22.Ng6 1–0. DEFFM – GuestGXXN, freechess.org, 2018.

5.a4 c5 6.c4 b6 7.Be2 (7.d4 cd4 8.ed4 e4+=) 7...Bb7= 8.Nf3 Nf6 (8...e4 9.Ng1=) 9.0–0+= Be7 10.d3 (10.d4 cd4 11.ed4 e4+=) 10...Nbd7 11.Nbd2 Qc7 12.Rc1 0–0 13.Qc2 d5 (better 13...Rad8=) 14.Be5?? (better 14.cd5 Nd5 15.d4 ed4 16.Nd4+=) 14...Ne5–+ 15.Ne5 Qe5 16.cd5 Nd5 17.Nc4 Qg5 18.f4 Qf6 19.Bf3 Nb4 20.Qe2 Bf3 21.Rf3 Rab8 22.Rg3 Rfd8 23.Ne5 g6 24.Rd1 Qe6 25.Qh5 (25.Rd2 Bf6 26.d4 Rbc8–+) 25...Bf6 26.d4 cd4 27.ed4 Kh8 (better 27...Qa2–+) 28.Qf3 (28.Qh6 Bg7 29.Qh4 Qa2–+) 28...Be5 (28...Rbc8 29.Rg4–+) 29.fe5 Rbc8 30.Rh3 Nd5 31.Qe4 (31.Qf2 Rd7–+) 31...Rc3 (31...Rc3 32.Qh4 Rh3 33.Qd8 Kg7 34.gh3 Qh3+–). GuestRMRY – GuestKWBH, freechess.org, 2017.

5.a4 c5 6.c4 f6 7.Bd3 Ne7 (7...f5 8.Nh3+–) 8.Qf3 (8.Nc3!?+–) 8...f5 9.e4 (9.Qh5 g6 10.Qe2 Bg7+=) 9...f4+= 10.Qe2 1–0. DEFFM – cibrid, freechess.org, 2018.

5.a4 c5 6.c4 Nf6 7.d4 ed4 8.ed4 cd4 9.Qd4=.

5.a4 Bd7 6.c4 cb5 7.cb5 Nf6 8.Nf3 Be7 9.Be2 0–0 10.0–0 h6 (10...Bf5 11.d3=) 11.Nc3 b6 (11...Bf5 12.Rc1+=) 12.Rc1 (12.e4 Bg4+–) 12...Be6 (12...Bf5 13.d4 Nbd7 14.de5 de5 15.Bd3+=) 13.h3 (13.e4!?+–) 13...Nbd7= 14.d4 e4 15.Nh2 d5 16.Ng4 Ng4 17.Bg4 Bg4 18.Qg4 Nf6 19.Qf5 (19.Qe2 Rc8=) 19...Bb4 20.Ne2 Qd6 (20...Rc8!?=) 21.Rc6+= Qe7 (21...Qd8 22.Nf4 Rb8 23.Rfc1+=) 22.Rfc1 (22.Nf4 Rfd8+–) 22...Ba3 (22...Bd6 A) worse 23.Rb6 g6 24.Ba3 gf5 (24...Ba3?! 25.Qf6 Qf6 26.Rf6=) 25.Bd6 Qa7–/+; B) 23.h4+=) 23.Ba3 Qa3 24.Rb6 Qa4 (better 24...Qb2!? 25.Rf6 gf6 26.Qg4 Kh8+–) 25.Nf4+– Qa3 26.Rc7 Qa2?? (26...Ne8 27.Nd5 Ra6 28.ba6 a4 29.Ne7 Kh8+–) 27.Rf6 gf6 28.Qf6 (28.Ne6 Qa1 29.Kh2 h5 30.Qf6 Qh1 31.Kh1 fe6 32.Qg7) 28...Rac8 29.Nh5 (29.Nh5 Qb1 30.Kh2 Qh1 31.Kh1 Rc7 32.Qg7) 1–0. Abdullaevich (1930) – knganesh97 (1970), lichess.org, 2020.

5.a4 Bd7 6.c4 Nf6 7.Nf3 Be7 8.Be2 c5 9.0–0 b6 10.d3 0–0 11.Nbd2 Bh3. GuestCMWC – GuestTMKM, freechess.org, 2017.

5.a4 Bd7 6.c4 Nf6 7.f4 ef4=+ 8.ef4 Be7 9.Nf3 0–0 10.Be2 Ne4 (10...d5 11.Qc2=+) 11.0–0= Bf6 12.d4 c5 (better 12...Re8!?=) 13.Qc2+– Bf5 (13...d5 14.Bd3 cd4 15.cd5 Nc3 16.Bh7 Kh8 17.Bc3 dc3+–) 14.Bd3+– d5 15.cd5 (15.g4!? Bg4 16.cd5 Bf3 17.Rf3 Qd5 18.Be4 Bd4 19.Kh1+–) 15...Qd5+– 16.Ne5 cd4 (better 16...Rc8 17.Bc4 cd4 18.Bd5 Rc2 19.Bf7 Kf8 20.Bd4 Be5 21.fe5 Kf7 22.Rf5 Ke6=) 17.Bc4?? (better 17.g4 Ng5 18.fg5 Bd3 19.Nd3 Bg5 20.Nf4+–) 17...Qd6 18.Ba3 Qc7 (better 18...d3 19.Bd6 dc2 20.Bf8 cb1R (worse 20...Kf8 21.Na3+=; worse 20...cb1B 21.Ba3 Bc2 22.Bf7 Kh8 23.Rac1+=) 21.Rab1 Kf8–/+) 19.Bf7?? (19.Bf8 Kf8 A) 20.Nf7? d3 21.Bd3 Qc2 (21...Qf7?! 22.Be4 Be4 23.Qc8 Qe8 24.Qe8 Ke8 25.Ra2=+) 22.Bc2 Ba1–+ (22...Kf7?! 23.Ra3=+); B) 20.Qe2+–) 19...Rf7–+ (19...Rf7 20.Qc7 Rc7–+) 0–1. GuestKYWH – VVZ, freechess.org, 2017.

5.a4 Nd7 6.c4 Qe7 (6...Ngf6 7.Nc3=) 7.Nf3 (7.d4 Ngf6=) 7...h6 (7...e4 8.Nd4 Ne5 9.d3 ed3 10.Bd3+=) 8.Be2+= g6 (8...e4 9.Nd4+=) 9.0–0 Bg7 10.d3 (10.d4 Ngf6+=) 10...f6 (10...Ngf6 11.Nc3+=) 11.Nbd2 h5 (11...f5 12.Nb3+=) 12.Ne4 (12.Bc3 g5+–) 12...c5 (12...f5 13.Neg5+=) 13.Re1 (13.Nc3 Nb6+–) 13...b6 (13...f5 14.Nc3+=) 14.d4 (14.Nc3 Bb7+–) 14...Bb7+= 15.Nc3 (15.d5 0–0–0+=) 15...e4 (15...0–0–0 16.Nd5 Qe6 17.Qc2+=) 16.Nd2 (16.Nh4 Qf7+=) 16...f5 17.Nd5 Bd5 18.cd5 cd4 19.ed4 Ndf6 (19...Ngf6 20.Qb3+=) 20.Bc4 (20.Qc2 Rb8+–) 20...Rc8+= 21.Rc1 Kf7 (21...Nh6 22.Bb3 0–0 23.Rc6+–) 22.Nf3 (better 22.Bb3 Rc1 23.Bc1+–) 22...Nh6?? (22...Bh6 23.Ne5 Kg7 24.Rc2+=) 23.Ng5 (better 23.Ne5 Kg8 24.Ng6+–) 23...Kg8+– 24.Ne6 Nhg4 (24...Nf7 25.Rc3+–) 25.Bb3 Kh7 (25...Rc1 26.Bc1 h4 27.f3 ef3 28.gf3+–) 26.Ng5 (26.f3 Bh6 27.fg4 Bc1 28.Bc1 hg4+–) 26...Kh6 Black intends e3 27.Qd2 (better 27.Rc8 Rc8 28.Bc1+–) 27...Rc1?? (better 27...e3 28.fe3 Kg5 29.e4 f4 30.Rc8 Rc8+=) 28.Bc1 (28.Ne4 Kh7 29.Ng5 Kg8 30.Qc1 Qd8+–) 28...Bf8? (better 28...e3 29.fe3 Ne4 30.Ne4 fe4+–) 29.h3 e3 (29...Kg7 30.hg4 hg4 31.Qc3+–) 30.fe3 Kg7 31.hg4 hg4 32.e4! Ne4 (32...fe4 33.Qf4 Decoy; 32...Ne4 33.Qd1 Decoy) 33.Re4! fe4 34.Ne6 (34.Qf4 g3+–) 34...Kg8 35.Qf4 Bh6 (35...Bg7 36.Qg4 (worse 36.Qe4 Bd4 37.Kf1 Rh1 38.Ke2 Qf7+–) 36...Rh4 37.Qg3+– (37.Qg6?! Rh1 38.Kh1 Qh4 39.Kg1 Qe1 40.Kh2 Qh4 41.Kg1 Qe1 42.Kh2 Qh4 43.Kg1=)) 36.Qg4 (36.Qe4 Qf6 37.Bh6 Rh6 38.Qg4 Qh4 39.Qh4 Rh4+–) 36...Bc1 (36...Qh7 37.Bh6 Qh6 38.Qe4 Kh7+–) 37.Qg6. GuestZJVN – GuestJSVS, freechess.org, 2016.

5.a4 Nd7 6.Nf3 c5 (6...Ngf6 7.Be2=) 7.c4 (7.Nc3 Ngf6=) 7...Qe7 (7...e4 8.Ng1=) 8.d3+= h6 (8...Ngf6 9.Be2+=) 9.Be2 g6 (9...Ngf6 10.0–0+=) 10.0–0 (10.Nc3 Ngf6+=) 10...Bg7 11.Nc3 Nb6 (11...Ngf6 12.Qc2+=) 12.Nd2 (12.e4 Nf6+=) 12...Be6 (12...Nf6 13.Qc2+=) 13.Re1 (13.f4 ef4 14.Rf4 Be5+=) 13...h5 (13...Nf6 14.Bf3+=) 14.f4 (14.e4 Nf6+–) 14...Nf6 (14...ef4 15.ef4 Qh4+=) 15.fe5 (15.Bf3 0–0+=) 15...de5= 16.Nde4 (16.e4 Ng4=) 16...Nfd7 (16...Ne4 17.Ne4 f5 18.Nf2=) 17.Rf1 (17.Bf3 0–0–0=) 17...0–0 (17...0–0–0 18.Qe1 f5 19.Nd2=) 18.Bh5 (better 18.Qe1!?+=) 18...gh5=+ 19.Qh5 Nf6?? (better 19...Rfd8=+) 20.Nf6+– (20.Qe5?! Ne4 21.Qg7 Kg7 22.Nd5 f6 23.Ne7 Nd2+=) 20...Bf6 21.Ne4 Bg7 22.Ng5 (better 22.Be5 f6 23.Bd6+–) 22...Rfb8 23.Qh7 (23.Rf3 Rd8+=) 23...Kf8 24.Qg6 Nd7?? (better 24...Kg8 25.Qh7 Kf8=) 25.Ne6+– Ke8 26.Ng7 Kd8 27.Rf7 Nf8 28.Rf8! Qf8 29.Ne6 Ke7 30.Nf8 Rf8 31.Be5 Rf7 32.Qd6 (32.Bd6 Kd7 33.Qf7 Kd6 34.Rf1 Re8 35.Rf6 Ke5 36.Rf5 Kd6 37.Rd5) 32...Ke8+– 33.Qg6 (33.Qg6 Ke7 34.Bd6 Kd7 35.Qf7 Kd6 36.Rf1 Re8 37.Rf6 Ke5 38.Rf5 Kd6 39.Rd5) 1–0. GuestFSNV – GuestTZQQ, freechess.org, 2016.

5.a4 Nf6 6.c4 Be7 7.Nf3 Bg4 (7...0–0 8.d4=+) 8.h3 Bf3 9.Qf3 Nbd7 (9...0–0 10.Nc3=) 10.bc6+= Nc5 (10...bc6 11.Qc6 d5 12.Bc3+=) 11.cb7 (11.d4 e4 12.Qd1 Ne6 13.cb7 Rb8+–) 11...Rb8 12.Qc6 Qd7 13.Qd7 Kd7 14.Ba3 (14.Nc3 Rb7 15.Nb5 e4+–) 14...Rb7 (14...Na4 15.Bd6 Bd6 16.Ra4 Rb7 17.Na3=) 15.Bc5 dc5 16.Nc3 Rhb8 (16...Rb4 17.Rd1+=) 17.Nb5 e4 (17...Rb6 18.Rd1+–) 18.Be2 Bd6 (18...Ke6 19.d4+–) 19.0–0 (19.0–0–0 Ke7+–) 19...Be5 20.Ra3 Ne8 (20...Ke6 21.d4 Bd6 22.Rb3+–) 21.d4 ed3 (21...Bd6 22.Rb3+– (22.Nd6?! Kd6 23.Ra2 Rb2+=)) 22.Bd3 (22.Rd3!? Ke6+–) 22...g6+– 23.Be4 Rb6 24.Rd3 Ke7 25.Rfd1 Nf6 26.Bd5 h5 (26...Rd8 27.f4 Bb8 28.g3+–) 27.e4 (27.f4 Bd6+–) 27...Bd4 (27...Rc8 28.g3 h4 29.f4+–) 28.g3 (28.Nd4 cd4 29.Rd4 Nd7+–) 28...Nd7 (28...Nd5 29.ed5 (29.Nd4 Nb4 30.Nb5 Nd3 31.Rd3 Re6=+) 29...Bg7 30.Re3 Kd7 31.Rde1+–) 29.Kg2 Ne5 (better 29...h4+–) 30.Nd4 (30.R3d2 Nc6+–) 30...cd4 (30...Nd3!? 31.Nc6 Rc6 32.Bc6 Rb3+=) 31.Rd4+– Rb2 32.R1d2 g5 33.f4 (33.c5 g4 34.c6 Rd2 35.Rd2 Rb1 36.hg4 hg4+–) 33...gf4+– 34.gf4 Ng6 35.f5 Nf4 (35...Ne5 36.c5+–) 36.Kg3 (better 36.Kf3!? Rd2 37.Rd2 Nh3 38.c5+–) 36...Ne2+– 37.Re2! Re2 38.Kh4 Rb3 39.Kh5 Rh3 40.Kg4 Rh1 (40...Ree3 41.Rd1 Reg3 42.Kf4=) 41.c5 (41.Bc6 Rf1+–) 41...Rf2 (41...Rf1 42.Bc4 Rg2 43.Kh3=) 42.Kg3 (42.Rd3 Rg1 43.Rg3 Rff1+=) 42...Rhf1 (42...Rc2 43.c6+=) 43.c6 (better 43.Rd3!?+–) 43...Rf3= 44.Kg4 Rf4 45.Kg5?? (better 45.Kh3 R4f3 46.Kh4 Rf4 47.Kg3 R4f3 48.Kg2 R3f2 49.Kg3 Rf3=) 45...f6 46.Kh5 (46.Kg6 Rg4 47.Kh5 Rg5 48.Kh4 Rh1) 46...Rh1 47.Kg6 Rg4 0–1. Abdullaevich (1930) – KarKas85 (1970), lichess.org, 2020.

5.a4 Nf6 6.Be2 Be7 7.Nf3 0–0 8.c4 (8.0–0 Bf5=) 8...Bf5 (8...e4 9.Nd4=+) 9.d4 e4 10.Nfd2 d5 11.Nc3 Bb4 12.0–0 Qd7 13.Qb3 Rd8 14.Ba3 cb5 (14...Bc3 15.Qc3 cb5 16.cb5=) 15.ab5 (worse 15.Bb4 bc4 (worse 15...ab4 16.Nb5 Nc6 17.c5+=) 16.Qb2 ab4 17.Qb4 Nc6–+) 15...dc4 16.Nc4 Bc3 17.Qc3 Nd5 18.Qd2 Qb5 19.Nd6 Qd7 20.f3 Re8? (better 20...Nf6+=) 21.Bc4+– (21.Ne8?! Qe8 22.Bc4 Qd7+–) 21...ef3?? (21...Be6 22.fe4 Nc7 23.Rf7 Qf7 24.Nf7 Kf7+–) 22.Bd5 (22.Ne8?! Nb6 23.Nd6 Nc4 24.Nc4 fg2+–) 22...fg2 (22...Bg6+–) 23.Rf5 Nc6 1–0. DEFFM – GuestZMDQ, freechess.org, 2018.

5.a4 Nf6 6.Nf3 Qb6 7.c4 Be7 8.Nc3 0–0 9.Qc2 Bg4 10.Be2 Nbd7 11.0–0 Rfe8 12.h3 Bh5 13.Rab1 Bg6 14.d3 Qc7 15.Nh4 Nf8 16.Ng6 Ng6 17.Rfd1 Rab8 18.Ne4 Ne4 19.de4 Nf8 20.b6 Qd8? (better 20...Qb6!? 21.Be5 Qc7+=) 21.c5! Qc8? (21...dc5 22.Qc3 Double attack (22.Rd8 Pinning; 22.Rd8 Deflection; 22.Qc3 Decoy)) 22.cd6 (22.Bg4 Qd8 23.Be5 de5 24.Rd8 Rbd8+–) 22...Bd8 (22...Bf6 23.Qd2 Nd7 24.Bc3+–) 23.d7! Nd7 24.Bg4 Re7 (24...Re6+–) 25.Rd7 Rd7 26.Be5 (26.Bd7?! Qd7 27.Be5 Ra8+–) 26...Ra8 27.Rd1 (27.Bd7?! Qd7 28.Qc3 f6+–) 27...Rd1 (27...Bb6 28.Rd7 Qe8+–) 28.Qd1 (28.Qd1 Bg5 29.Bc8 Rc8 30.Qg4+–) 1–0. Adlai – Mftojdaz, internet, 2019.

5.a4 Nf6 6.Nf3 Bg4 7.Be2 Nbd7 8.d3 cb5 9.ab5 Qb6 10.c4 Be7 11.Nbd2 (11.d4 Qc7=) 11...0–0 12.0–0 Rfe8 13.h3 Bh5 (13...Be6 14.d4=) 14.Re1 (14.g4 Bg6 15.g5 Nh5+–) 14...Rad8 (14...Qc5 15.g4 Bg6 16.g5+–) 15.Qa4 (better 15.g4!? Bg6 16.g5+–) 15...Ra8+= 16.Qc2 d5 (16...Rec8!?=) 17.Ne5+– Ne5 18.Be5 Bb4? (18...Be2 19.Re2 dc4 20.Qc4+–) 19.Bd4 (19.Bf6 Be2 20.Bd4 Bd3 21.Qd3 dc4 22.Qc4 Qe6+–) 19...Qc7 (19...Qe6 20.Bf6 Be2 21.Bc3+–) 20.Bf6 Be2 21.Re2 gf6 22.Qb2 (22.Qa4 Rad8+–) 22...Kg7 23.cd5 Qd6 (23...Rad8 24.Nb3 Rd5 25.Rc2+–) 24.Ne4 (better 24.e4 Qe5 25.Qb1 Qc3+–) 24...Qd5? (24...Qe5 25.d6!+–) 25.Qf6 (better 25.Nf6!? Qe5 26.Ne8 Re8+–) 25...Kf8 (25...Kg8 26.Qb2 Be7 27.Ra4+–) 26.Qh8 (26.Rc1 Qe5+–) 26...Ke7 27.Qh7 Rh8 (27...Qd3 28.Qh4 Kf8 29.Qh6 Ke7 30.Qf6 Kf8 31.Ng5+–) 28.Qg7 Rag8 (28...Rhc8+–) 29.Qf6 Kf8 30.Qf4 (better 30.Rc2 Qe6 31.Qe6 fe6+–) 30...Rh3?? (30...Qh5 31.Ng3 Qb5+–) 31.Qb8 Ke7 32.Qc7 (better 32.Qg8 Rh5 33.Rc2+–) 32...Qd7 (32...Ke6 33.Qb6 Bd6 34.f4+–) 33.Qd7 Kd7 34.Nf6 (34.Nf6 Ke6 35.Ng8+–) 1–0. GuestPPCJ – TaphaMis, freechess.org, 2017.

5.c4 cb5 6.cb5 b6 7.Nf3 (7.d4 e4=) 7...Nf6= 8.Nc3 Be7 (8...e4 9.Nd4=) 9.Be2 0–0 10.Qc2 (10.Rc1 Bf5=) 10...Bb7 (10...Nbd7 11.0–0=) 11.0–0 Nbd7 12.d4 (12.Rac1 Rc8=) 12...Rc8 (12...e4 13.Nd2 Rc8 14.Rad1=) 13.de5 (13.Qf5 Re8+=) 13...Ne5 (13...de5 14.Rfd1 Nd5 15.Qd2=) 14.Nd4 Nd5 (14...Nc4 15.Rac1+=) 15.Rfd1 (15.Rac1 Bf6+=) 15...Bh4= 16.Qd2 (16.Rac1 Qg5 17.g3 Nb4+=) 16...Nc3 (16...Qg5 17.g3 Nc3 18.Bc3=) 17.Bc3 Qg5 18.f3 Rc5 19.e4 Qg6? (better is 19...Rfc8!? 20.Rac1 Qd2 21.Bd2 d5 22.Rc5 Rc5= (22...bc5? 23.Nf5+–)) 20.Nf5+/– d5?? (better is 20...Bg5 21.Qb2 Bf6+/–) 21.Be5+– Bf6 22.Bd6 Bc3 (22...de4 23.Bc5 bc5+–) 23.Ne7 (23...Kh8 24.Ng6 fg6 25.Qe3+–) 1–0. Ahrens,W – McNally,W, compuServe, 1994.

5.c4 cb5 6.cb5 Qb6 7.Na3 Bd7 (7...Be6!?=) 8.Nc4+– Qc7 9.Rc1 Nf6 (9...Bb5 10.Nd6! Qd6 11.Bb5 Nc6+–) 10.Ne5+– Qd8 11.Nc4 (11.Nd7 Nbd7 12.Nf3 d5+–) 11...Bb5 (11...d5!? 12.Ne5 Bd6+–) 12.Nd6! Bd6 (12...Qd6 13.Rc8 Double attack (13.Bb5 Discovered attack); 12...Bd6 13.Bb5 Discovered attack) 13.Bf6 Qf6 (13...gf6 14.Bb5 Nd7 15.Qg4+–) 14.Rc8 (14.Bb5?! Ke7+–) 14...Kd7 15.Rh8 Bf1 16.Kf1 h6 (16...Qf5 17.Nf3 Ra7 18.Nd4 Qd3 19.Ke1+–) 17.Nf3 (17.Qg4 Kc7+–) 17...Ra6 18.Qb3 Qa1 (18...Kc7 19.Ke2 Rb6 20.Rc8 Kc8 21.Qb6+–) 19.Ke2 Qh1 20.Qb7 Ke6 21.Re8 Kf6 22.Qb2 Kg6 23.Nh4 Kh7 (23...Kh5 24.Qg7 Be7 25.Qf7 Kh4 26.Qe7 Kh5 27.Qf7 Kg4 28.Re4 Kg5 29.Qg7 Rg6 30.Qe5) 24.Qc2 g6 25.Qb2 (25.Qb2 Qf1 26.Kf1 Bf8 27.Rf8 Rf6 28.Qf6 Nd7 29.Qf7) 1–0. usingprogram (2025) – 1954dwojka (1640), kurnik, 2013.

5.c4 cb5 6.cb5 Bd7 7.a4 Nf6 8.Nf3 Be7 9.h3 0–0 10.Be2 Ne4 (10...Bf5 11.Nc3=) 11.0–0 (11.d4 Bf5+=) 11...Bf6 (11...Nf6 12.Nc3=) 12.d3 Nc5 13.Nbd2 Be6 14.Nh2 (14.d4 ed4 15.Bd4 Nbd7+=) 14...Qc7 (14...Re8 15.Nc4=) 15.Qc2 (15.d4 ed4 16.ed4 Qe7+=) 15...Nbd7 (15...Rc8 16.Ng4 Be7 17.d4=) 16.d4 ed4 17.ed4 Na6 18.Rac1 (18.Qc1 Qc1 19.Rfc1 Nb4=) 18...Qc2= 19.Rc2 Nb4 20.Rc7 Rac8 21.Rfc1 Rc7 (21...Nc5 22.Rc8 (worse 22.dc5 Rc7 23.Bf6 gf6–/+) 22...Rc8 23.Ng4 Na4 24.Rc8 Bc8 25.Nf6 gf6 26.Ba1=) 22.Rc7= b6 (22...Rb8 23.Ne4 Bd8 24.Rc1=) 23.Ne4 d5 (23...Bd8 24.Ra7 d5 25.Ng3=) 24.Nf6+= gf6 (24...Nf6!? 25.Rb7 Nd7+=) 25.Bf3 Nd3 (25...Rd8 26.Nf1+–) 26.Ba3+– Rb8 27.Bd5! Bd5 28.Rd7 Rc8?? (better 28...Bb3 29.Ng4 Ba4 30.Nf6 Kg7 31.Nh5 Kg8+–) 29.Rd5+– Rc1 (29...Nf4 30.Rf5 Ne2 31.Kf1 Nd4 32.Rf6+–) 30.Nf1 (better 30.Bc1 Nc1 31.Rd6 Kf8+–) 30...Rc2 (30...Ra1 31.Rd8 Kg7 32.Bf8 Kg6 33.Rd6+–) 31.Rf5 Rc4 32.Rf6 (32.Rf3 Nb4+–) 32...Ra4 33.Be7 Rd4 34.Ne3 (34.Rb6 h5+–) 34...Rd7 35.Nf5 Ne5 (35...Rd5 36.g4 h5 37.Rh6+–) 36.Rb6 Rd1 37.Kh2 Nd3 (37...h5 38.Rh6+–) 38.f3 (38.Rb8) 38...h5+– 39.Kg3 (better 39.Rd6 a4 40.Bf6 Kh7+–) 39...Rd2 (39...Ne5+–) 40.Bf6 Kh7 (40...Re2 41.Rb8 Kh7 42.Nh4 Rg2 43.Ng2+–) 41.h4 (41.Bc3 Rg2 42.Kg2 f6+–) 41...Nb4 (41...Re2 42.Bd4 Re6 43.Re6 fe6 44.b6+–) 42.Rd6 (better 42.Bc3 f6 43.Bd2+–) 42...a4 (42...Rd5 43.Rd5 Nd5+–) 43.Rd2 a3 (43...Kg6 44.b6 Kf5 45.Rd6 Kg6 46.b7 Kh7 47.b8Q Nd5 48.Qh8 Kg6 49.Qg7 Kf5 50.Qg5) 44.b6 (44.Ne7 Nd3 45.Rd3 a2 46.Rd8 a1Q 47.Rh8) 44...a2+– 45.b7 a1Q (45...Nc6 46.Ba1 f6 47.Rd7 Kg6 48.Kf4 Ne7 49.Ne7 Kf7 50.b8Q Ke6 51.Qe8 f5 52.Nf5) 46.Ba1 Nc2 (46...Nd3 47.b8Q Ne5 48.Qe5 f6 49.Rd7 Kg6 50.Qf6) 47.Rc2 f6 (47...Kg6 48.b8Q Kf5 49.Qb6 f6 50.Qf6) 48.b8Q (48.b8Q Kg6 49.Qe8 Kf5 50.Qe4) 1–0. Abdullaevich (1805) – raishulazam, lichess.org, 2020.

5.c4 cb5 6.cb5 Nf6 7.d4 Nbd7 8.Nd2 =.

5.c4 c5 6.d4 cd4 7.ed4 ed4 (7...e4 8.Nc3 Nf6 9.Rc1=) 8.Be2 (8.Nf3+=) 8...Qb6 (8...d5!?+=) 9.Bd4 Qc7 (9...Qd8 10.Nc3 Be6 11.Nf3+–) 10.Nc3 Nf6 (10...Ne7 11.Nf3+–) 11.Bf6 gf6 12.Nd5 Qd8? (better 12...Qc5+–) 13.b6 Na6 14.c5! dc5 (14...Nc5 15.Nc7 Double attack; 14...dc5 15.Qa4 Double attack) 15.Bb5 Bd7 16.Nf6 Qf6 (16...Ke7 17.Nd7 f6+–) 17.Qd7 (worse 17.Bd7 Ke7 18.Bg4 Bg7=+) 1–0. Adlai – Ceack, corr, 2018.

5.c4 Bd7 6.a4 Ne7 7.Be2 Qb6 8.Nf3 cb5 (8...e4 9.Ng5 d5 10.Bh5+=) 9.cb5 (9.ab5 e4 10.Ng5 d5 11.cd5 Bf5+/–) 9...Bg4 (9...e4 10.Nd4+=) 10.0–0 Nd7 (10...e4 11.Bd4 Qc7 12.Ng5 Be2 13.Qe2+/–) 11.h3 (better is 11.Ne5!? de5 12.Bg4+/–) 11...Bf3 12.Bf3 Nc5 (better is 12...d5!?+=) 13.d4+– Ne6 14.Nd2 Rc8 (14...ed4 15.Bd4 Nd4 16.Nc4+/–) 15.d5 (15.de5!? de5 16.Rc1 Rc1 17.Qc1 Ng5 18.Be5 Nf3 19.Nf3 f6+–) 15...Ng5 (15...Nc5 16.Rc1+/–) 16.Bg4 f5 17.Bh5 g6 18.Be2 Bg7 19.Nc4 Qd8 20.Ba3 (20.f4!? Ne4 21.fe5 de5 22.d6 Rc4 23.Bc4 (23.de7 Qd1 24.Bd1 Nc5–/+) 23...Nd6 24.Be6+–) 20...Ne4 21.Qd3 0–0 22.Kh2 Nc5 23.Qd1 b6 (23...e4 24.Rc1=) 24.f4 (better is 24.Rc1!?=) 24...ef4–/+ 25.Rc1 fe3 26.Ne3 f4 (26...Be5 27.Kg1–/+) 27.Nc4 Ne4 (27...h5 28.Bd3=+) 28.Bf3 (28.Bg4 Rc7+=) 28...Nc5 (28...Nc3 29.Qb3 Nf5 30.Rc3 Bc3 31.Qc3 Rc4 32.Qc4+–) 29.Bb2 (better is 29.Be2!?=) 29...Bb2–/+ 30.Nb2 Nf5 31.Nc4 Qh4 (better is 31...h5–/+) 32.Qe1? (better is 32.Bg4!?–/+) 32...Ng3 (32...Qe1 33.Rce1 Na4 34.Rc1–+) 33.Nd6 Nf1 34.Qf1 Qg3 35.Kh1 Rcd8 36.Ne4 Qh4 (better is 36...Ne4!? 37.Be4 Qa3–+) 37.Qc4? (37...Ne4 38.Be4–+; better is 37.Nc5!? bc5 38.Bg4=+) –+. maaxa – DoubleMint, Live Game Caissa's Web, 2004.

5.bc6 bc6 6.Nf3 Nf6 7.Be2 g6 8.0–0 Bg7 9.c4 0–0 10.d3 Ba6 11.Nbd2 Nbd7 12.Qa4 Rb8 13.Ba3 Qc7 14.Ng5 Nc5 15.Bc5 dc5 16.Nge4 Ne4 17.Ne4 Rb4 18.Qa3 Qb6 19.Rac1 f5 20.Ng5 Rb8 21.Bf3 Bc8 22.Rc3 h6 23.Nh3 g5 24.Bd1 f4 25.e4 g4 0–1. mila77 (1715) – fleksern (1695), kurnik, 2012.

5.bc6 Nc6 6.Nf3 Bg4 7.Be2 Nf6 8.c4 Be7 9.Nc3 0–0 10.–0 d5 11.cd5 Nd5 12.d4 (12.Ne5!? Be2 13.Ne2 Ne5 14.Be5+/–) 12...ed4 13.Nd5 Qd5 14.Nd4 Be2 15.Qe2 Nd4 16.Bd4 Bc5 17.Qb5 b6 18.Rfc1 Rfd8 19.Bc5 Rac8?? (better is 19...bc5 20.Rc5 Qd2+/–) 20.Qb6+– Rc5 (20...Qd2+–) 21.Qc5 (21.Qc5 g6 22.a3+–) 1–0. Wlassewitch,Sylvain (1920) – Burdet,Francois (1950), Loire Cup, 2003.

5.d4 e4 =.

5.Nf3 cb5 (5...Nf6 6.bc6 bc6 7.Nc3=) 6.Bb5+= Bd7 7.Bc4 (7.Nc3 Nf6+=) 7...Be6 (7...Qb6 8.Ba3=) 8.Be6+= fe6 9.0–0 h6 10.Ne1 (10.d3 Nf6+=) 10...Nf6 11.f4 Be7 (11...ef4!? 12.Bf6 Qf6=) 12.fe5+– de5 13.Be5 0–0 14.Nc3 (14.d4 Nc6 15.Bf6 Bf6+–) 14...Nc6+= 15.Bg3 Rc8 (15...Bb4 16.Nb1+=) 16.d4 (16.Nd3 Qd7+–) 16...Bd6 (16...Nd4 17.ed4 Rc3 18.Rb1=) 17.Bf4 (17.Bd6 Qd6 18.Nb5 Qd5+–) 17...Bf4 (17...e5 18.de5 Be5 19.Be5 Ne5 20.Qd4=) 18.Rf4 (worse 18.ef4 Qd4 19.Qd4 Nd4–/+) 18...Nd5 (18...e5 19.de5 Ne5 20.Qd8 Rfd8 21.Rd1+=) 19.Rf8+– Qf8 20.Ne4 (20.Nd5!? ed5 21.Rb1+–) 20...Ne3= 21.Qe2?? (21.Qd3 Nd5 22.c3 Qa3=) 21...Nd5?? (better 21...Qf4 22.Qd3 Rf8–+) 22.Nf3 Nf4 (better 22...Ncb4 23.c3 Nc3 24.Nc3 Rc3 25.Qe6 Qf7=) 23.Qb5 (23.Qd2 Rd8 24.c3 e5=) 23...Rd8 (better 23...Ng2!? 24.Qb3 Nf4–/+) 24.c3= Qf5 25.Ng3?? (better 25.Qf5 ef5 26.Ng3=) 25…Qb5–+ (25...Qb5 26.Nh4 g5–+) 0–1. Akrapovik (1630) – P_R_O_S_T_O_T_A_K (1630), lichess.org, 2019.

4.e3 Bd7

5.a4 c6 6.c4 cb5 7.cb5 Nf6 8.h3 Nd5 (8...Be7 9.d4=) 9.Nf3 (9.Qf3 Be6+=) 9...Qc7 (9...Be7 10.Be2=) 10.Be2 (10.e4 Nb4 11.Nc3 Be7+=) 10...g6 (10...Be7!?=) 11.0–0 Bg7 12.Nc3 Nc3 13.Bc3 0–0 14.Rc1 Qd8 15.d4 (15.e4 Qe7+–) 15...e4 16.Nh2 (16.Nd2 d5+=) 16...d5 17.Qd2 Qh4 (better 17...Qg5!? 18.Kh1 b6+=) 18.Ba5+– Bh3? (better 18...Qg5 19.Kh1 Rc8+–) 19.gh3+– Qh3 20.Bb4 Re8 21.a5 Nd7 (21...b6 22.a6+–) 22.a6 (better 22.Bg4 Qh4 23.Bd7 Red8+–) 22...ba6? (22...Nf6 23.ab7 Rab8 24.Rc7+–) 23.ba6 (better 23.Bg4 Qh4 24.Bd7+–) 23...Nb6 (23...Ra7 24.f3+–) 24.Rc7 (24.Rc6 Reb8+–) 24...Bh6 (24...Nc4 25.Bc4 dc4 26.Qc2+–) 25.a7 Rec8 26.Bd6 (26.Rfc1 Qe6+–) 26...Rc7 27.Bc7 Nc4 (27...Qe6 28.Ra1 Qc6 29.Bb8+–) 28.Bc4 (28.Qb4 Qc8 29.Qb8 Qb8 30.ab8Q Rb8 31.Bb8 Ne3 32.fe3 Be3 33.Kg2 Bd4+–) 28...dc4 (28...Ra7 29.Bb6 Rb7 30.Qa5 Rb6 31.Qd5+–) 29.Bb8 (better 29.Qb4 Ra7 30.Qb8 Bf8 31.Qa7 Qf5+–) 29...Kg7 (29...Bf8 30.Rc1 Qh5 31.Qc2 Qg5 32.Kf1+–) 30.Qc2 Qh5 (30...Qe6+–) 31.Qe4 Qg5 32.Kh1 Qd8 (32...Ra7 33.Ba7 Qd8+–) 33.Qa8 Kg8 34.Qc6 c3 35.a8Q c2 (35...Bg5 36.Be5 f6 37.Qd8 Kg7 38.Qcd7 Kh6 39.Qf8 Kh5 40.Qg4) 36.Qc2 (36.Bd6 Qa8 37.Qa8 Kg7 38.Bf8 Kf6 39.Qd8 Ke6 40.Qd6 Kf5 41.Qe5) 36...Bg7 37.Qc7 Qf8 38.Ba7 (38.Qc5 Qd8 39.Ra1 Kh8 40.Be5 h5 41.Qf8 Qf8 42.Qf8 Kh7 43.Qg7) 38…h6 (38...h6 39.Qf8 Bf8 40.Rb1 Bc5 41.Rb7 Be7 42.Qe7 g5 43.Qf7 Kh8 44.Qe8). Abdullaevich (1780) – jono4eke (1780), lichess.org, 2020.

5.a4 c6 6.Nf3 Nf6 7.Be2 Be7 8.d3 0–0 9.c4 c5 10.0–0 b6 11.Nc3 Bg4 12.Ng5 Be2 13.Qe2 Qd7 14.h3 (14.Nge4 Qd8+–) 14...h6 (14...d5!?+=) 15.Nge4+– Qb7 16.Nf6 Bf6 17.Nd5 Nd7 18.f4 Bd8 (18...Rae8 19.Qg4 Re6 20.f5+–) 19.Qg4 Nf6 (19...Re8 20.Rf3+–) 20.Nf6+– (20.Nf6 Bf6 21.fe5 Be5 22.d4+–) 1–0. GuestGQRD – GuestFXRW, freechess.org, 2017.

5.a4 Nf6 6.Bc4 c6 7.Nf3 cb5 8.ab5 b6 9.0–0 Be7 10.Bd5?? (10.e4 Bg4+= (10...Ne4? 11.Bd5 Ra7 12.Be4+–)) 10...Ra7?? (better 10...Nd5 11.c4 Nf6–+) 11.Bc4= Be6 12.Be6 fe6 13.Nh4 (13.Nc3 0–0+=) 13...Nd5 (13...e4 14.g3 0–0=+) 14.g3?? (better 14.Qh5 Kd7 15.Nf3+–) 14...Bh4–/+ 15.Qh5 g6 16.Qh4 Qh4 17.gh4 Nb4 (17...Rc7!? 18.Na3 Rf8–/+) 18.Ba3=+ Nc2 19.Ra2?? (better 19.Rc1 Na1 20.Rc8 Kf7 21.Rh8+=) 19...Na3–+ 20.Ra3 Nd7 21.Rd3 (21.Rc1 Ke7–+) 21...Ke7 22.Nc3?? (22.Ra3–+) 22...Nc5 23.Ne4 (23.Nd5 ed5 24.Ra3–+) 23...Nd3 24.Ng5 (24.f3 Rf8–+) 24...Kf6 (24...a4 25.Ra1–+) 25.Rb1 (25.Ne4 Kg7 26.Nd6 a4–+) 25...h6 (better 25...d5 26.Kf1–+) 26.Rb3 (26.Ne4 Ke7–+) 26...hg5 (better 26...Nc5 27.Rc3 hg5 28.d4–+) 27.hg5 Kg5 28.Rd3 Rh5 (better 28...d5!? 29.Rc3–+) 29.Rd6 Rah7 (better 29...a4 30.Rc6–+) 30.Re6 Rh2 31.Kf1 (31.Re5 Kg4 32.Re4 Kf3 33.Rf4 Ke2–+) 31...Rh1 (better 31...Rf7 32.Re5 Kg4 33.Ke1 Rff2 34.Re6–+) 32.Ke2 Kf5 33.Rb6 Ra7 0–1. atif_zubair – Paule1959, lichess.org, 2019.

5.a4 Nf6 6.Nf3 Be7 7.Be2 0–0 8.0–0 Bf5 9.c4 Nbd7 10.d4 e4 (10...ed4 11.Nd4 Bg6 12.Nc3=) 11.Nfd2 (11.Nh4 Bg6+–) 11...c6 12.Qc2 d5 13.Nc3 Rc8 14.c5 (14.Rfc1 Bg4=) 14...Qc7 (14...b6 15.cb6 Qb6 16.Rfc1=) 15.f3 (15.b6 Qb8+=) 15...ef3= 16.Qf5 fe2 17.Ne2 Rfe8 (better 17...b6!?=) 18.b6+= Qd8 19.Ng3 Nf8 20.Nf3 (20.Bc3 Qd7+–) 20...Ng6 21.Ng5 (21.Rae1 Qd7+=) 21...h6 (better 21...Nh4 22.Qd3 Ng6+=) 22.Nf7?? (better 22.Ne6 fe6 23.Qg6+=) 22...Kf7–/+ 23.Qh5 Qd7 24.Rae1 Qe6 25.Rf4 Bd8 (25...Rf8 26.Bc3–/+) 26.Bc3=+ Kg8?? (better 26...Qd7=+) 27.Qg6+– Ne4 28.Qe6 Re6 29.Ne4 (29.Ba5?! Bg5 30.Bb4 Ng3 31.hg3 Bf4 32.gf4 Re4=) 29...de4 30.Ref1 (30.Kf1 Bg5 31.Rf2 Rf6+–) 30...Bg5 31.Rf7 (31.Ba5 Ra8 32.Be1 Bf4 33.Rf4 Ra4=+) 31...Be3 32.Kh1 Bg5 (32...Rb8 33.d5 Rg6 34.dc6 Bc5 35.cb7+–) 33.Rb7 Bf6 34.Rc7 e3?? (34...Rb8+–) 35.Rc8 Kh7 36.b7 e2 37.Re1 Bh4 38.b8Q Be1 39.Qb1 g6 (39...Rg6 40.Rc6 h5 41.Qg6 Kg8 42.Rc8) 40.Qb7 (40.Qb7 Re7 41.Qe7) 1–0. DEFFM – ihgeo, freechess.org, 2018.

5.a4 Nf6 6.Nf3 Be7 7.Be2 0–0 8.c4 c6 9.0–0 cb5 10.ab5 Be6 11.Nc3 d5 (11...Nbd7 12.Ng5+=) 12.Ng5 (better 12.Ne5!? dc4 13.Bc4+–) 12...Bf5= Black plans e4 13.Nf3 e4 (13...d4!? 14.ed4 ed4 15.Nd4 Qd4=) 14.Nd4+= Bg6 15.f3 (15.cd5 Bc5+=) 15...dc4 (15...ef3 16.Nf3 dc4 17.Ne5=) 16.Bc4+= ef3 (16...Bd6 17.fe4 Qc7 18.d3+=) 17.Nf3 (17.Qf3 Ra7+–) 17...b6 (17...Nbd7 18.Na4=) 18.Nd4+= Ne4? (better 18...Bd6 19.Ba3 Ra7+=) 19.Ne4+– Be4 20.Qg4 Bd5?? (20...Bg6 21.Bf7! Rf7 22.Rf7 Kf7 23.Qf3 Kg8 24.Qa8 Nd7+–) 21.Nf5 (better 21.Ne6 Bf6 22.Bf6 Qf6 23.Rf6 Be6 24.Be6 Ra7+–) 21...Bf6 22.Bf6 (22.Nh6 Kh8 23.Rf6 Qf6 24.Bf6 gf6 25.Bd5 Nd7 26.Qd7 f5 27.Qe7 Rg8 28.Qf6 Rg7 29.Ba8 a4 30.Qd8 Rg8 31.Qg8) 22...Qf6 23.Bd5 Rd8 (23...Ra7+–) 24.Ba8 Rd2 (24...Nd7 25.Bd5 Kh8 26.d4+–) 25.Rad1 (25.Nh6 Kh8 26.Rf6 Rd8 27.Nf7 Kg8 28.Nd8 g6 29.Rg6 hg6 30.Qg6 Kf8 31.Qf7) 25...Rd1 26.Rd1 (26.Nh6 Kf8 27.Qd1 Qf1 28.Kf1 gh6 29.Qd6 Kg7 30.Qe5 Kf8 31.Qb8 Kg7 32.Bd5 Kg6 33.Qg8 Kf6 34.Qf7 Kg5 35.Qg7 Kh4 36.Qh6 Kg4 37.Be6) 26...g6 27.Rf1 Kh8 28.Nh6 (28.Nh6 Qc3 29.Nf7 Kg7 30.Qf4 a4 31.Qb8 Qe3 32.Kh1 Qf4 33.Rf4 g5 34.Qh8 Kg6 35.Qf6 Kh5 36.Qg5) 1–0. GuestPFGG – TiffanyThomson, freechess.org, 2017.

5.a4 Nh6 6.Be2 Nf5 (6...Be7 7.Nf3+=) 7.c4 (7.Nc3 Be7+=) 7...c5 (7...Be7+=) 8.f4 (8.Nc3 Be6+–) 8...f6 (better 8...Qh4 9.Kf1 ef4=+) 9.Bf3 Qc8 (9...Bc8 10.Be4+–) 10.Ne2 Be6 11.Qc2 Rg8? (better 11...Nh4!? 12.Be4 f5+–) 12.0–0+– Nd7 13.e4?? (13.Bd5 Bd5 14.cd5+– (14.Qf5?! Bc4 15.d3 g6+=)) 13...Nd4+= 14.Nd4 cd4 15.d3 f5? (better 15...g6!?+=) 16.Re1 (16.ef5!? Bf5 17.Bd5 Rh8+–) 16...fe4 17.Be4 Rh8 (17...g6!?+–) 18.f5 Bf7 19.Bd4! ed4?? (19...Be7 20.Qe2 Nc5+– (20...ed4?? 21.Bb7 Qd8 22.Ba8+–)) 20.Bb7 (20.Bb7 Be7 21.Bc8 Rc8 22.Qb2+–) 1–0. Bonetti,Shane – Kibitz, 2000.

5.c4 h6 6.Nc3 Nf6 7.d4 ed4 8.ed4 Be7 (8...d5 9.c5+– (worse 9.cd5 Bb4=; worse 9.Nd5 Nd5 10.Qe2 Ne7–/+)) 9.Bd3+– c6 10.Nf3 cb5 11.cb5 Bg4 (11...Be6 12.0–0+–) 12.h3 Bh5 (12...Be6!?+–) 13.g4+– Bg6 14.Bg6 fg6 15.Nh4 0–0 16.Ng6 Re8 17.0–0 Nh7?? (better 17...d5 18.Nf4 Nbd7 19.Ncd5 Nd5 20.Nd5 Nf6+–) 18.Qb3 d5 19.Nd5 a4 (19...Kf7 20.Ndf4 Kf6 21.Qe6 Kg5 22.Qf5) 20.Nde7 1–0. Pierre – Racuch, internet, 2020.

5.Qf3 c6 6.a4 (6.Nc3 Nf6 7.Nh3 Be7=) 6...Qf6 (6...Nf6 7.Nc3=) 7.c4 (7.Nc3 Be7+–) 7...Qf3 (7...Qg6 8.Nc3=) 8.Nf3+= Be7 (8...Nf6 9.Nc3+=) 9.c5+– f6 10.cd6 Bd6 11.Bc4 Ne7 12.Nc3 Bg4 (12...cb5 13.ab5 Bg4 14.Ne4+–) 13.0–0 (13.h3 Bf5+–) 13...Nd7 14.d4 Bf3 15.gf3 Nb6 16.Be6 (16.Bb3 ed4 17.Ne4 0–0–0 18.Bd4 Kc7+–) 16...Ng6+= 17.Rfd1 Ke7 18.Bb3 Rad8 (18...f5!?+=) 19.bc6+– bc6 20.Ne4 Bb8? (better 20...Nd5 21.Rac1 Nb4+–) 21.Rac1+– Rc8 22.Ba3 Kd7 (22...Ke8 23.Be6 Rc7 24.Bd6+–) 23.de5 Kc7 24.ef6 gf6 25.Nf6 Kb7 26.Rb1 Be5 (26...Rcd8 27.f4+–) 27.Nd7 Nd7 28.Rd7 Rc7 (28...Ka8 29.f4 Bb8 30.Bb2+–) 29.Be6 Ka8 30.f4 Rd7 (30...Nf4 31.Rc7 Bc7 32.ef4 Bf4+–) 31.Bd7 (31.fe5?! Rg7 32.Kf1 Ne5=) 31...Bc7 (31...Rb8 32.Bc6 Ka7 33.Bc5 Ka6 34.Bb5 Rb5 35.ab5 Kb7 36.fe5 Ne5+–) 32.Bc6 (32.Bc6 Ka7 33.Bc5 Bb6 34.Rb6 Rg8 35.Rb1 Ka6 36.Bb7) 1–0. DEFFM – GuestHRWQ, freechess.org, 2018.

5.Nf3 c6 6.c4 cb5 7.cb5 b6 8.Nc3 (8.Bc4 Be6 9.Be6 fe6+–) 8...Nf6+– 9.Bc4 Bg4 (9...Be7 10.0–0 Bg4 11.h3+–) 10.Qb3 (better 10.h3 Bh5 11.g4+–) 10...Qc7? (better 10...Ra7!?+–) 11.Ng5 Be6? (11...Bh5 12.Rc1 Qb7+–) 12.Be6 (worse 12.Ne6 fe6 13.Be6 Nbd7+–) 12...fe6 13.Qe6 Be7 (13...Qe7 14.Qc8 Qd8 15.Qd8 Kd8 16.Nf7 Ke7 17.Nh8 Nbd7+–) 14.Rc1 Qd7 (14...Qd8 15.Ba3 Rf8 16.Nce4 Ne4 17.Ne4+–) 15.Qf7 Kd8 16.Ne6 Qe6 17.Qe6 Nbd7 18.Nd5 Nd5 19.Qd5 Ra7 20.0–0 Bf8 21.f4 e4 22.Qe4 (22.f5 h5 23.f6 Nc5 24.fg7 Bg7 25.Qd6 Ke8 26.Qb8 Kd7 27.Qa7 Kd6 28.Bf6 Bf6 29.Rf6 Ne6 30.Qc7 Kd5 31.Rf5) 22...a4 23.Bd4 Nc5 24.Qc6 Rc7 25.Qb6 Kc8 26.Qa5 Kd7 27.b6 Rc8 28.Qa7 Ke8 29.Bc5 dc5 (29...Rc5 30.b7 Kf7 31.b8Q Be7 32.Qh8 Rb5 33.Qd7 Kf6 34.Qg8 Kg6 35.Qe7 Kh5 36.Qgg7 Rc5 37.g4) 30.Rc4 Bd6 (30...h5 31.b7 Rb8 32.Re4 Kf7 33.Qb8 Kg6 34.Qe8 Kh6 35.b8Q Rg8 36.Qf7 Rh8 37.Qe5 Bd6 38.Qeg7) 31.Re4 Kd8 (31...Kf8 32.Qd7 Rb8 33.Qd6 Kg8 34.Qb8 Kf7 35.Qc7 Kf6 36.Qe7 Kg6 37.f5 Kh6 38.Rh4) 32.Re6 Rc6 33.Qb7 Rb6 34.Qb6 Bc7 35.Rd6 Kc8 36.Qa6 Kb8 37.Rd7 a3 (37...Rd8 38.Rb1 Bb6 39.Rb6) 38.Rb1 Bb6 39.Rb6 1–0. Pierre – Waldorffy, internet, 2020.

5.Nf3 Be7 6.d4 e4 7.Nfd2 d5 8.c4 c6 9.cd5 (9.Nc3 Nf6+–) 9...cd5+= 10.Nc3 Nf6 11.Qb3 Be6 12.Be2 Nbd7 13.0–0 0–0 14.f3 (14.Rfc1 Nb6 15.Ba3 h6=) 14...ef3 15.Bf3 Increasing the pressure on the isolated pawn on d5 (15.Nf3 h6=) 15...Nb6=+ 16.Be2? (16.Ba3 Rc8=+) 16...Qd6 (better 16...a4!? 17.Qc2 a3–/+) 17.a4=+ Rac8 18.Ba3 Qd7 19.Rac1 (19.Rae1 Rfe8=+) 19...Ne4 (19...Bf5=+) 20.Be7? (better 20.Nde4!? de4 21.Qb2=+) 20...Nd2–/+ 21.Qb2?? (better 21.Qa2!? Nf1 22.Bf8 Ne3 23.Bc5–/+) 21...Nf1 (better 21...Nbc4 22.Bc4 A) 22...Rc4?! 23.Bf8 Nf1 24.Bg7 Nh2 25.Kh2 Kg7 26.Kg1=+; B) worse 22...Qe7 23.Qd2 (23.Bd5?? Nf1 24.Kf1 Rc3 25.Rc3 Bd5–+) 23...Rc4 24.Ne2–/+; C) 22...Nc4–+) 22.Bf8 Ne3 (22...Kf8 23.Qa3 Qe7 24.Qe7 Ke7 25.Kf1–+ (25.Bf1? Kd7–+); 22...Rf8?! 23.Rf1 Rc8 24.Bd3–/+) 23.Bg7? (better 23.Bc5 Nbc4 24.Bc4 Nc4 25.Qa2–+) 23...Kg7 24.Qd2 Nbc4 (24...Nf5 25.Rf1–+) 25.Bc4 Nc4 (worse 25...dc4 26.Qe3 Bf5 27.d5+–) 26.Qg5 Kf8 27.Qh6 (27.Re1 Qd6–+) 27...Ke8 28.Qh7 (28.Ne2 Nb6 29.Rf1 Na4 30.Qh7 Qe7–+) 28...Qe7 29.Qh8 (29.Ne2 Qb4 30.h4 Qa4–+) 29...Kd7 30.Qh6 Qa3 31.Qg5 (31.Rc2 Qb4 32.Rc1 Qb2–+) 31...Qd6 (better 31...Qb2 32.h4 Nd6 33.Ne2 Qe2 34.Rc8 Qd1 35.Kh2 Nc8 36.Qf4–+) 32.b6 (32.Na2 Qe7 33.Qe7 Ke7–+) 32...Nb6 33.Kf2 (33.Qd2 Qb4 34.Rb1 Qc3 35.Qc3 Rc3 36.Rb6 Kc7–+) 33...Qb4 (better 33...Qh2 34.Nb5 Rg8–+) 34.Qg3 (34.Ne2 Rc1 35.Qc1 Na4–+) 34...Qd4 (better 34...Qb2 35.Ne2 Rc1–+) 35.Qe3 Qe3 36.Ke3 Na4! 37.Kd4 (37.Na4 Rc4 Double attack (37...Rc1 Pinning; 37...Rc1 Deflection; 37...Rc4 Decoy)) 37...Rc4 38.Kd3 Rc3 (better 38...Nc5!? 39.Ke2 Nb3 40.Re1 Rc3 41.Kf2–+) 39.Rc3 Nc3 40.Kc3 b5 (40...b5–+) 0–1. GuestVFQC – GuestBBLD, freechess.org, 2019.

4.e3 Nd7

5.d4 ed4 6.Bd4 Ngf6 7.Nf3 Be7 8.Nc3 0–0 9.Bc4 c6 10.bc6 bc6 11.Rb1 d5 12.Bd3 Ba6 13.Ba6 Ra6 14.0–0 Bc5 15.Qe2 Rb6 16.Rb6 Bb6 17.Rb1 Bd4 18.Nd4 Qc7 19.Qa6 c5 20.Nc6 The isolani on a5 becomes a target 20...d4? (better is 20...Ne5 21.Rb6 Nfg4+=) 21.Nb5+– Qb6 22.Qb6 Nb6 23.ed4 cd4 24.Ne7 Kh8 25.Nd6 Nbd7 26.Rb7 h6 27.Nc6 Kh7 28.Nd4 (28.Na5?! Nc5 29.Rc7 d3 30.cd3 Nd3+/–) 28...g5 29.Nc6 Kg6 30.Ra7 Nb6 (30...a4 31.f3+–) 31.Ne5 (31.Ra5?! Nfd7+–; 31.Na5?! Nc8 32.Ra8 Rd8+–) 31...Kg7 32.c4 Na4 33.Ndf7 h5 (33...Rb8 34.g3 Nc5 35.Ng5 Kf8 36.Ra5 hg5 37.Rc5 Rb2+–) 34.Nd6 Kh6 (34...Kg8 35.Nf5 Nd7 36.Ne7 Kg7 37.Rd7 Kf6+–) 35.Nf5# 1–0. Janek – Sloba, internet, 2016.

5.Nf3 f5 6.Be2 c5 7.bc6 bc6 8.c4 Be7 9.Nc3 Nh6 10.Rb1 1–0. pcmvr (2860) – vairisk (2325), net–chess.com, 2011.

5.Nf3 Ngf6 6.c4 b6 7.d4 e4 (7...ed4 8.Qd4 Nc5 9.Be2+=) 8.Nfd2 Bb7 9.Nc3 g6 (9...d5 10.cd5 Bb4 11.Bc4+=) 10.Be2 (10.d5 Bg7 11.Nce4 0–0 12.Nf6 Bf6 13.Bf6 Qf6+–) 10...Bg7 11.Qc2 Qe7 12.0–0 (12.d5 Rg8+–) 12...0–0+= 13.Rae1 Rfe8 14.f3 ef3 15.Bf3 Bf3 16.Rf3 Ng4 17.g3 Bd4? Increases the pressure on the backward pawn (better 17...Qg5 18.Nd5 Qh5+–) 18.Nd5+– Be3 (18...Qg5 19.Bd4 Qh5 20.Nc7 Qh2 21.Kf1+–) 19.Rfe3 Qe3 (19...Qf8 20.Ne7 Re7 21.Re7 Nge5+–) 20.Ne3 Ne3 21.Qc3 (21.Qc3 Ne5 22.Re3+–) 1–0. GuestVZXZ – GuestFSKC, freechess.org, 2018.

5.Nf3 Ngf6 6.Be2 Be7 7.0–0=.

5.Nf3 Ngf6 6.Be2 g6 7.0–0 Bg7 8.c4 0–0 9.Nc3 b6 (9...Nb6 10.d4 ed4 11.ed4=) 10.d4+= ed4 (10...Re8 11.de5 de5 12.Qc2+=) 11.Nd4 Bb7 12.Bf3 Bf3 13.Qf3 Nc5 (13...Ne5 14.Qe2+=) 14.Nc6 (14.Nd5 Nfe4 15.Nc6 Qd7 16.Bg7 Kg7+–) 14...Qe8 (14...Qd7 15.Nd5 Nfe4 16.Bd4+–) 15.Rad1 (15.Nd5 Nd5 16.Bg7 Kg7 17.cd5 Qe4+–) 15...Rc8 (15...Nfe4 16.Ne4 Qe4 17.Qe4 Ne4 18.Ne7 Kh8 19.Bg7 Kg7 20.Nd5+=) 16.Ba1+– Qe6 (16...Ra8 17.Nd5 Nd5 18.Bg7 Kg7 19.cd5+–) 17.Nd5 Nd5 18.cd5 (worse 18.Qd5 Rce8+=; worse 18.Rd5 Rce8+=) 18...Qd7 19.Bd4 (19.Bg7 Kg7 20.Rd4 Rce8+–) 19...f5 20.Bc5 (20.Rfe1 Rce8+–) 20...bc5 (20...dc5 21.Rc1+–) 21.Rc1 a4 22.Rc4 a3 23.Ra4 (23.Rb1 Rce8+–) 23...Bb2 (23...Ra8 24.Ra8 Ra8 25.Rc1+–) 24.Ra7 (better 24.Rb1+–) 24...Qe8? (better 24...Ra8!?+–) 25.b6!+– cb6? (better 25...Ra8 26.Rc7 Rf7 27.Rf7 Qf7+–) 26.Re7 1–0. DEFFM – TheTroubleman, freechess.org, 2018.

5.Nf3 Ngf6 6.Be2 g6 7.0–0 Bg7 8.c4 Qe7 9.d4 0–0 10.Nc3 Re8 11.Nd2 (11.Qc2 ed4 12.ed4 Nb6+=) 11...c6 (11...Ra7 12.Re1+=) 12.Na4 (12.d5 cb5 13.Nb5 Nc5=) 12...ed4 (12...Qe6 13.d5 cd5 14.cd5+=) 13.Bd4 Nc5 (13...Qe6 14.Nf3=) 14.bc6 (14.Bf3 cb5 15.Nb6 Rb8+=) 14...bc6 15.Bf3 (15.Nb6 Rb8 16.Nc8 Rec8 17.Bc5 dc5+=) 15...Ra6 16.Nc5 dc5 17.Bc3 Be6 (17...a4 18.e4+=) 18.Qa4+– Attacking the isolated pawn on c6. Attacks the isolani on a5 18...Rc8 (18...Ng4 19.Bg7 Kg7 A) 20.Bc6? Qc7 21.Rfd1 Rc6–+ (21...Qc6?! 22.Qb5–+); B) 20.Nb3+–) 19.Rab1 (19.Ba5 Qa7 20.Nb3 Nd7–+) 19...Nd7 (19...Bf5 20.Rbd1+–) 20.Bg7 (20.Ba5? Bc3 21.Qc2 Ba5–+) 20...Kg7 21.Rb7 (21.Rfd1 Ne5+–) 21...Qf6 (21...Nb6 22.Qc6 Rc6 23.Re7+–) 22.Ne4 (22.Rd1 Ne5 23.Be2 Ng4+–) 22...Qe5 23.Rd1 (23.Qb3 Rd8+–) 23...Nb6 Attacking the isolated pawn on c4 24.Qa3 Nc4 25.Qc5 a4 (25...Raa8!?+–) 26.Ng5+– Qc5?? (better 26...Ra5 27.Qe5 Re5 28.Ne6 Re6+–) 27.Ne6 Kh6 28.Nc5 Ra5 29.Nd3 Ne5 (29...f6 30.Rb4 Na3 31.Rh4 Kg7 32.Nb2+–) 30.Ne5 Re5 31.Rf7 c5 (31...Rb8+–) 32.Rdd7 Rh8 33.g4 a3 (33...c4 34.h4 c3 35.Bd1+–) 34.h4 (34.h4 c4 35.Be2 c3 36.f4 c2 37.g5 Rg5 38.hg5) 1–0. DEFFM – TheTroubleman, freechess.org, 2018.

5.Nf3 Ngf6 6.Be2 g6 7.0–0 Bg7 8.d4 ed4 9.ed4 0–0=.

5.f4 e4 6.Ne2 Nc5 7.Ng3 Bd7 8.Bc4 (8.Bd4 Ne6 9.Nc3 Nd4 10.ed4 Qh4=) 8...c6 (8...h5 9.Nc3 Nf6 10.Nge2=) 9.Nc3 (9.Nh5 Nh6=) 9...Qb6 (9...Nf6!?=) 10.Qh5 (better 10.bc6 bc6 11.Rb1+–) 10...Be6? (better 10...d5 11.Be2 0–0–0+–) 11.Be6+– Ne6 12.f5 (12.Nge4 d5 13.Ng5 Ng5 14.fg5 Ne7+–) 12...Nf6 13.Na4 Qc7?? (13...Qd8 14.Bf6 Qf6+–) 14.Bf6 gf6 (14...Nf4 15.ef4 gf6 16.Ne4 0–0–0+–) 15.fe6 Qe7 16.Nb6 (16.Nb6 Rd8 17.0–0+–) 1–0. DEFFM – GuestQFXL, freechess.org, 2019.

5.f4 Ngf6 6.Nf3=+.

5.g3 Ngf6=+ 6.Bg2 Qe7 (6...Nb6 7.Nf3=+) 7.Ne2 g6 (7...Nb6 8.Nbc3=) 8.0–0 (8.f4 e4=) 8...Bg7 9.a4 Nb6 10.d4 Nc4 (10...e4 11.Nd2=) 11.Bc3 e4 12.Nd2 Nd2 (12...Nb6 13.Nb3=) 13.Qd2 b6 14.Bb2 0–0 15.d5 (15.c4 Bg4=) 15...Bb7 (15...Bg4 16.Nc3=) 16.c4 Rfe8 (16...Rae8 17.Nd4=) 17.Nd4 Nd7 18.f4 (18.Qc3!?=) 18...ef3=+ 19.Rf3? (better is 19.Bf3 Qe3 20.Qe3 Re3 21.Kf2=+) 19...Ne5–+ 20.Rf4 Nc4 21.Qf2 Nb2 (21...Qe3 22.Rb1–+) 22.Qb2 Qe3 23.Qf2 Qf2 24.Kf2 Be5 25.Rh4 Bf6 26.Rf4 Bg5 (27.Re4 Bd5 28.Re8 Re8 29.Bd5 Be3 30.Kf3 Bd4–+) 0–1. Wolfram – Kukula, corr 3GMM–46, 1995.

5.c4 Ngf6

6.Nf3 e4 7.Nd4 =+.

6.Nf3 Qe7

7.Nc3 Nb6 8.d3 =.

7.Nc3 c6 8.Be2 g6 9.a4 Bg7 10.0–0 0–0 11.d4 Re8 12.Ba3? e4 13.Nd2 c5 14.Qc2? b6 15.d5 Nf8 16.h3 h5 17.Rae1 Bf5 18.Bb2 N8h7 19.Qd1 Ng5 20.f4 ef3 21.Bf3 Nfe4 22.Nde4 Ne4 23.Be4 Be4 24.Rf4 Bf5 25.Rf5?! gf5 26.Qh5 Qf6 27.Rf1 Qg6 28.Qf5 Qf5 29.Rf5 Re3 30.Rg5 f6 31.Rf5 Kf7 32.Kf2 Rae8 33.h4 Rd3 34.Kf1 Ree3 35.Na2 Rd1 36.Kf2 Rb3 0–1. Schiffler – Schlieder, corr 1951.

7.Nc3 c6 8.Be2+= g6 (8...e4 9.Nd4 Ne5 10.f4 ef3 11.Nf3+=) 9.a4 (9.d4 Bg7+=) 9...Bg7 10.0–0 0–0 11.d4 Re8 12.de5 (12.Rb1 e4 13.Nd2 c5+=) 12...de5 (12...Ne5 13.Ne5 de5 14.Ba3+=) 13.Ba3 (13.e4 Nc5 14.Qc2 Bg4+=) 13...c5 14.e4 Nb6 15.h3 (15.Qc2 Bg4+=) 15...Bf8 (15...Be6 16.Qb3= (worse is 16.Ne5 Nh5 17.Nd3 Bc3 18.Bc5 Qc7 19.Bb6 Qb6+=)) 16.Bb2 (16.Qc2 Bd7+/–) 16...Rd8 (16...Be6 17.Qb3+=) 17.Qc2+/– Nfd7 18.Rad1 Bg7 19.Rd2 (19.Nd5 Nd5 20.cd5 Qd6+/–) 19...Nf8 (19...Bh6 20.Rd3+/–) 20.Nd5 (20.Rd8 Qd8 21.Rd1 Nbd7+/–) 20...Nd5 21.cd5 b6 22.Bc4 Rd6 23.Re2 Nd7 24.Bb3 g5 25.Nd2 h5 26.Nc4 Rg6 Black intends g4 27.Rd1 g4+/– 28.d6 Qe8 29.Re3 Bf6 30.Qe2+– gh3 31.Rh3 h4 32.f4 Rb8? 33.Qh5 ef4?? 34.Rh4! Kf8 35.Bf6 Nf6 36.Qh8 Ng8 37.Ne5 (37.Ne5 Qe5 38.Qe5+–) 1–0. Sternik,Ryszard – Sokanski,Wlodzimierz, corr GT 242, 1997.

7.d4 (withdraw, 0–1). Mi Kern – Majchrowski, corr 3GMM–58 1995.

7.Be2 e4 8.Nd4 =.

7.Be2 g6 8.0–0 Bg7 9.Nc3 0–0 10.d4 ed4 (10...Re8 11.Re1=) 11.ed4+= b6 (11...d5 12.c5+=) 12.Bd3 Re8 (12...d5 13.cd5 Qd6 14.Qc1 Nd5 15.Nd5 Qd5 16.Qc7+/–) 13.Re1 Qd8 14.Re8 Qe8 15.Qd2 Bb7 16.Re1 Qf8 17.d5 Re8 18.Nd1 (18.Re8 Qe8 19.a3 Nc5+=) 18...Re1 19.Qe1 Qe8 (19...Nc5 20.Bc2+=) 20.Qe8+/– Ne8 21.Bg7 Kg7 22.g3 (22.Kf1 Ne5 23.Ke2 Nf6+=) ½–½. Woschkat,Karl_Heinz – Majchrowski, corr 3GMM–58, 1995.

7.Be2 g6 8.0–0 Bg7 9.d4 ed4 10.ed4 0–0 11.Re1 Re8 12.Nc3 Nb6 13.Bd3 Qd8 14.Qc2 Bg4 15.Nd2 a4 16.a3 c6 17.c5 dc5 18.dc5 Nbd5 19.h3 Re1 20.Re1 Nf4 21.Re3 Be6 22.bc6 bc6 23.Bc4 Bf5 24.Nce4 Ne4 25.Ne4 Be4 26.Qe4 Nh3 27.Rh3 Bb2 28.Qc6 Qd1 29.Kh2 Be5 30.g3 Rd8 31.Qe4 Qd4 =. Van Esbroeck – Wittig, corr CIF 1991–93.

7.Be2 g6 8.0–0 Bg7 9.d4 e4 10.Nfd2 0–0 11.Nc3 c6 (11...Re8 12.Qc2+=) 12.a4 Re8 13.Qb3 (13.Qc2 c5+=) 13...c5 14.Nd5 (14.d5 Nb6=) 14...Qd8 (14...Nd5 15.cd5 Qg5 16.Nc4 cd4 17.Nd6=) 15.Nc3 (15.Nf6 Nf6 16.Rad1 Qe7+=) 15...Qe7 16.d5 (16.Rae1 Nb6 17.d5 Bf5+=) 16...b6 (16...Nb6 17.Bd1=) 17.Rae1 Nf8 18.Bd1 Bf5 19.Bc2 Qd7 (19...N8d7 20.h3+=) 20.f3 (20.h3 h6+/–) 20...ef3+= 21.gf3 (21.Rf3 Bc2 22.Qc2 Ng4+=) 21...Re7 22.Kh1 Bc2 23.Qc2 h5 24.Nce4 N8h7 25.Nf6 Bf6 26.e4 Bb2 27.Qb2 Rae8 28.f4 f6 29.Rg1+/– g5 30.Qc3 Rg7 31.Re2 Kh8 32.fg5 Ng5 33.Qf6+– Nh3?? 34.Rg3 Kh7 35.Rg7 Qg7 36.Qf5 (36.Qf5 Qg6 37.Qh3+–) 1–0. Mueller,Klaus Detlef – Stock,Manfred, corr DDR, 1981.

5.d4 Ngf6

6.c4 Be7 7.Nd2 =.

6.c4 g6 7.Nf3 Qe7 8.Be2 Bg7 9.0–0 e4 10.Nfd2 0–0 11.Nc3 c5 12.dc5 (12.bc6 bc6 13.Rb1 Re8+=) 12...Nc5= 13.Nb3 Be6 14.Qc2 Nfd7 15.Rfd1 Rfd8 (15...f5 16.Nc5 Nc5 17.Qd2+=) 16.Rab1 (< 16.Ne4 Bb2 17.Nec5 Ba1 18.Nd7 Be5=) 16...f5 17.Ba3 (17.Nd5 Bd5 18.Nc5 dc5 19.cd5 Nb6+=) 17...Be5 18.Qd2 a4 19.Nc5 Nc5 (19...dc5 20.Nd5 Qd6 21.h3=) 20.b6 Qg5 (20...Qh4 21.g3 Qf6 22.Nd5=) 21.Nd5 Rac8 22.g3 Rd7 (22...Rf8 23.Qc2=) 23.Nc7+= Qf6 24.Rb5 Rdc7 (24...Rdd8!?+=) 25.bc7+/– Rc7 26.Qa5 Qe7 27.Bc5 Rc5 (27...dc5 28.Qa4 Kg7 29.Qb3+–) 28.Rc5 dc5 29.Qa4 (29.Qa8!? Kg7 30.Rb1 b6 31.Rb6 Kh6+–) 29...Kf7 30.Qb5 h5 31.Qb6 h4 32.Rb1 hg3 33.hg3 Bc8 34.Rd1 Be6 (34...Qc7 35.Qc7 Bc7 36.f4+/–) 35.Bf1 (35.a4 Qc7 36.Rb1 Bc8+–) 35...Kg7 (35...Qc7 36.Rb1 Bc8 37.Bg2+/–) 36.Rb1 Bc8 37.Rd1 ½–½. Antal,Sebestyen Jr (2330) – Ladanyi,Tibor (2215), HUN–chT2, 1999.

6.Nf3 e4 7.Nfd2 a4 8.c4 Nb6 9.Be2=.

6.Nf3 e4 7.Nfd2 b6 8.c4 d5 9.cd5 Bd6 (9...Bb7!?+–) 10.Nc3+– Qe7 11.Qc2 a4 (11...Bb4 12.Bc4+–) 12.a3 (12.Nce4 Bb7+–) 12...Bb7 (12...0–0 13.Nde4 Ne4 14.Qe4 Qe4 15.Ne4+–) 13.Nde4 (better 13.Bc4+–) 13...Bd5?? (better 13...Nd5 14.Nd5 Bd5+–) 14.Nf6+– Nf6 15.Nd5 Qd7 (15...Qd8 16.Nf6 Qf6 17.Qe4 Kd7+–) 16.Nf6 gf6 17.Qe4 Kd8 18.Qa8 Ke7 19.Qh8 Qf5 20.Rc1 (better 20.d5 Qg6+–) 20...Qe4 21.d5! Qd5 (21...Qd5 22.Bf6 Double attack (22.Bf6 Discovered attack; 22.Qh7 Deflection)) 22.Bf6 Kd7 (22...Ke6 23.Bc4 Qc4 24.Rc4 h5 25.Bh4 f6 26.Qf6 Kd7 27.Qf5 Ke8 28.Re4 Be7 29.Be7 c5 30.Bg5) 23.Qd8 Ke6 24.Bc4 c5 (24...h5 25.Bd5 Kf5 26.Qd7 Kf6 27.Qf7 Kg5 28.Qg7 Kf5 29.e4 Kf4 30.Qg3) 25.Bd5 Kf5 (25...Kd5 26.Qd7 Ke4 27.Kd2 c4 28.Rc4 Kd5 29.Qf7) 26.g4! Kg4 (26...Kg4 27.Qg8 Mate attack) 27.Qg8 Kf5 (27...Kh5 28.Qg5) 28.Qg5 1–0. DEFFM – lichess AI level 1, lichess.org, 2020.

6.Nf3 e4 7.Nfd2 d5 8.c4 dc4 9.Bc4 Bb4 (9...Nb6 10.Be2=) 10.Bc3 (10.a3 Bd6=) 10...Qe7 11.a3 (11.Bb4 ab4 12.0–0 0–0=) 11...Bd6 12.Bb2 b6 (12...0–0 13.Nc3=+) 13.Nc3 Bb7 14.Bb3 0–0 15.g4 g5 (better is 15...h6!?=) 16.h4+/– h6 17.hg5 (17.Nc4 Rac8+/–) 17...hg5 18.Nc4 (18.Qc2 Rfe8+=) 18...Kg7+= 19.Qe2 Rh8 20.0–0–0 Rh1 21.Rh1 Rh8 22.Rh8 Kh8 23.Nd6 cd6 24.Qc4 d5 (24...Kg7!?+=) 25.Qc7+/– (25…Ba8 26.Na4+/–) 1–0. Diener,Rudolf – Kunze,Markus, corr ICCF EU–M–722, 1985.

5.Nf3 g6

6.c4 Bg7 7.d4 ed4 8.ed4 Ne7 9.Be2 0–0 10.Nc3 b6 (10...Re8!?=) 11.0–0+= Bb7 12.d5 Nf5 13.Bd3 Nh4 14.Re1 Nf3 15.Qf3 (< 15.gf3 Qg5 16.Kh1 Ne5–/+) 15...Ne5 16.Qe2 (16.Qg3 f5 17.f4 Nd3 18.Qd3 Qh4+=) 16...Nd3 (16...Qh4 17.Qf1+=) 17.Qd3+= Bc8 18.Qd2 Bf5 (18...a4 19.Ne4+=) 19.Ne4+/– Bb2 20.Qb2 Be4 21.Re4 Re8 22.Rae1 Qd7 23.Qe2 Re4 24.Qe4 Kf8 25.Qd4 ½–½. Ree – Kawalek (year?).

6.c4 Bg7 7.Be2 f5 8.Nc3 Ngf6 9.d4 0–0 10.0–0 Kh8 11.a4 Qe7 12.Qc2 Nb6 = 13.de5 de5 14.Ba3 Qe8 15.Bf8 Bf8 16.Rfd1 Bd6 17.Na2 Ne4 18.Nc3 Nc5 19.Nd5 Nd5 20.cd5 b6 21.Bc4 Qe7 22.Qb2 Bd7 23.Nd2 Kg8 24.Ra2 Rf8 25.Qc2 Kf7 26.Be2 Ke8 27.Nc4 Kd8 28.Nd6 cd6 29.Rc1 Rf7 30.Qc3 Rf8 31.Rac2 Qf7 32.f3 h5 33.Qc4 Qe7 34.Rc3 h4 35.R3c2 f4 36.e4 Rh8 37.h3 Rh5 38.Kh1 ½–½. Hohenberger – Kempe 1973.

4.e3 Be6

5.c4 Nd7 6.d4 ed4 7.Bd4 Ne5 =.

5.c4 Nd7 6.Nf3 Nb6 7.d3 =.

5.c4 Nd7 6.Nf3 f5 7.Be2 (7.d4 Nb6=) 7...Be7 (7...Nb6 8.d3=) 8.0–0+= Bf6 9.Qc2 (9.d4 e4 10.Nfd2 Ne7+=) 9...Ne7= 10.d4 e4 11.Nfd2 0–0 12.Nc3 Nb6 13.Na4 Bf7 (13...Na4 14.Qa4 c5 15.bc6 bc6 16.Rab1=) 14.Nb6+= cb6 15.d5 Ng6 16.Rac1 Rc8 17.Qb1 Bb2 18.Qb2 Ne5 19.Qd4 Be8 20.f3 Bh5 21.Rf2 ef3 22.Bf3 Bf3 23.Nf3 Ng4 24.Re2 Re8 25.Qf4 Qf6 26.Ng5 (26.Nd4!?+=) 26...Ne5= 27.Rd2 (27.Rcc2 Nd3 28.Qd4 Qd4 29.ed4 Re2 30.Re2 h6–/+) 27...Ng6 (27...Rc4 28.Rc4 Nc4 29.Qc4 Qg5 30.Re2=+) 28.Qg3= f4 29.ef4. Grosmelder,Karl – Krasnov,Vasiliy G (2265), Memorial Y.Kutianin, 1992.

5.c4 Nd7 6.Nf3 Ngf6 7.Be2 h6 8.Nc3 (8.d4 e4 9.Nfd2 d5+=) 8...Be7 9.0–0 Nf8 (9...Nb6!?=) 10.d4+= N8d7 11.Qc2 ed4 12.Nd4 Ne5? (12...0–0 13.Rfd1+=) 13.Nd5?? (better is 13.f4 Bc4 14.fe5 de5 15.Bc4 ed4 16.Rad1+–) 13...Bc8 (13...Bd5 14.cd5 Nd5 15.Qe4+/–) 14.Rad1 Nh7?? (better is 14...0–0!?+/–) 15.f4 Ng4 16.Nf5 Bf5 17.Qf5 Ngf6 18.Bf3 Rb8 19.Bc3 b6 20.Nf6 Bf6+/– 21.Bc6 Kf8 22.Bd5 g6 23.Qd3 Bc3 24.Qc3 Qf6 25.Qd3 Kg7 26.e4 Rhf8 27.Rde1 Rbe8 28.Bc6 Rd8 29.g3 Qe7 ½–½. Kreuzer – Apholte, Ortsmeisterschaft Nh, 1980.

5.c4 Be7 6.d4 =.

5.c4 f5 6.d4 Nd7 (6...ed4 7.Bd4 c5 8.Bc3+=) 7.Nf3 e4 8.Nfd2 (8.d5 Bf7 9.Nd4 Qg5+=) 8...Ngf6= 9.Nc3 (9.d5 Bf7=) 9...c6 (9...d5 10.c5=) 10.bc6 (10.Be2 Rc8+=) 10...bc6 11.Ba3 (11.Rb1 Qc7=) 11...Be7 12.Be2 0–0 13.0–0 d5 (13...Qc7 14.Rc1=) 14.Be7 Qe7 15.c5 g5 (15...Qd8 16.Qa4 Qc7 17.Rab1+=) 16.Na4 (16.Qa4!?+/–) 16...f4+= 17.Rb1 Rab8 18.Nb3 Qd8 19.Qd2 f3 (19...fe3 20.fe3 Rb4 21.Nc3+=) 20.gf3 ef3 (20...g4 21.fg4 (< 21.Qa5 Qa5 22.Na5 Ra8 23.Nc6 Ra4=) 21...Ng4 A) 22.Na5 Qh4 23.h3 Nf2 24.Bf3 Qg3 (24...Rf3?! 25.Rb8 Nb8 26.Rf2=+; 24...ef3?! 25.Qf2 Qf2 26.Kf2–/+) 25.Bg2 Rb1 26.Re1 Bh3 27.Kf1 Bg2 28.Ke2 Qf3; B) 22.Qa5 Qh4 23.Qc7 Nde5 24.Qe5 Ne5 25.de5 Bh3–+; C) 22.h3=) 21.Bf3+/– Ng4 22.Bg2 Qc7 23.f4 Bf5 24.Rbc1 Rbe8 25.h3?? Ngf6?? 26.fg5 Ne4+/– 27.Be4 Be4 28.Qh2 Qd8 29.Qg3 Re6 30.Rf8 Nf8 31.Kh2 Rg6+/– 32.Rg1 h6 33.Qe1 Ne6 34.gh6 Qc7 35.Rg3+– Ng5 36.Kg1?? Nf3–+ 37.Kf1. Kabela,Adam – Hrouza,Ondrej (1695), CZE–ch U14, 2001.

5.c4 Nf6 (--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5 5.c4 Be6).

5.d4 ed4 6.Bd4 Nd7 =.

5.d4 ed4 6.Bd4 Nf6 =.

5.d4 Nd7 =.

5.Nf3 Nd7 6.Be2 (6.d4 Qf6+=) 6...Be7 7.0–0 f5 (7...Nb6 8.e4=) 8.d3 (8.d4 Bf6+=) 8...Ngf6 (8...c6 9.Nc3=) 9.c4+= h6 10.Nh4 (10.d4 e4 11.Nh4 c6+/–) 10...Nf8 (better is 10...0–0+=) 11.Bh5?? (11.d4 g5 12.d5 gh4 13.de6 h5+=) 11...Kd7?? (11...Nh5!? 12.Qh5 Bf7 13.Qf3 Bh4 14.Qb7–+) 12.g3?? (better is 12.Ng6!? Ng6 13.Bg6+=) 12...Nh5 (12...g5!? 13.Bf3 gh4 14.Bb7 Ra7 15.Bc6 Kc8–+) 13.Qh5=+ Bh4 14.gh4 g6 15.Qf3 (15.Qe2 Kc8=+ (< 15...Qh4 16.f4=)) 15...Kc8–/+ 16.Qg3 Rh7 17.c5 Kb8 18.b6= dc5 19.bc7 Rc7 20.Be5+/– Nd7 21.Bc7 Qc7 22.Qc7 Kc7+= 23.Nd2 b5 24.Rfc1 Kb6 25.a3 Rd8 26.Kf1 Ne5=+ 27.Rc3 Nd3–/+ 28.Ke2 Ne5 29.f4 Ng4 30.h3 Nf6 31.Rg1 Bf7 32.Rgc1 Rd2 33.Kd2 Ne4 34.Ke2 Nc3 35.Rc3 b4 36.ab4 ab4 37.Rc1 h5 38.e4 fe4–+ 39.Ke3 Bd5 40.Rg1 Bf7 41.Ke4 b3 42.Kd3=+ Kb5 43.Kc3= Kc6 44.Rd1 Be6 45.Rd3 Bf7 46.Re3 Kd6–/+ 47.Rd3 Kc6 48.Rd8+= c4 49.Rd1 Kc5 50.Rd7= Be6 51.Rc7 Kd6 52.Rg7 Bf5 53.Kc4?? b2–+ 54.Rb7 b1Q 55.Rb1 Bb1 56.Kd4 Bf5 57.Ke3 Bh3 58.Kf3 Bf5 59.Ke3 Kd5 60.Kf3 Kd4 61.Kg3 Ke3 (62.Kg2 Kf4–+) 0–1. uno (1810) – talnight (1905), ICC, 2003.

5.Nf3 f5 6.c4 Nd7 7.d4 e4 8.Nfd2 (8.d5 Bf7 9.Nd4 Qg5+=) 8...d5= 9.Nc3 (9.cd5 Bd5 10.Nc3 Ngf6=) 9...Ngf6 10.Qb3 Nb6 (10...Bb4 11.Be2=) 11.c5 a4 (11...Nbd7 12.Be2+=) 12.Qc2+= a3 13.Bc1 Nc4 (13...Nc8 14.Qb3+=) 14.Nc4+/– dc4 15.Nb1 Nd5 16.Bc4 (16.Na3?! Nb4 17.Qc3 Nd3 18.Bd3 cd3=) 16...Nb4 17.Qc3 Bc4 18.Qb4 (worse is 18.Qc4 Nd3 19.Kf1 Qh4+=) 18...Bd3 19.Qb3 (19.Nc3 Qg5 20.Rg1 Be7+/–) 19...Qg5 20.Qe6 Be7 21.Nc3 (21.Na3?? Qg2 22.Kd2 Qh1–+) 21...Qg2?? (better is 21...Qg6 22.Qg6 hg6+/–) 22.Nd5+– Qg5 23.Nc7 Kd8 24.Na8 Qg4 The mate threat is Qe2 25.Qb6 Ke8 26.Nc7 Kd7 27.c6 bc6?? 28.Qc6 Kc8 29.Ne6 (29.Ne6 Kb8 30.Qb6 Ka8 31.Nc7#) 1–0. Svitek,V – Kirwald,F, Potsdam, 1994.

5.Nf3 f5 6.c4 Nd7 7.Be2 Nb6 8.Qc2 Qe7 (8...Nh6 9.d4 e4 10.Nfd2+=) 9.0–0+= Nf6 10.d3 (10.c5 Nbd5+=) 10...h6 (10...Rd8 11.Nbd2+=) 11.Nbd2 (11.a3 a4+=) 11...g5 12.h3 (12.d4 e4 13.Ne1 Bg7+=) 12...Bg7 13.e4 (13.d4 e4 14.Ne1 0–0–0=) 13...fe4 14.Ne4 Ne4 15.de4 h5 (15...g4 16.hg4 Bg4 17.c5 dc5 18.Ne5 Be5 19.Bg4+=) 16.c5+= Nc8 17.cd6 (17.c6 b6 18.Bc1 Bf6=) 17...cd6= 18.Bc1 g4 (18...Bf6 19.Nh2=) 19.Ng5+= gh3 20.gh3 (worse is 20.Ne6 Qe6 21.g3 h4+=) 20...Nb6 (20...Bg8 21.Be3+=) 21.Qd1 0–0–0 22.Bh5 Rh5? 23.Qh5+– Bf6 24.Ne6 Qe6 25.Qg4?? Rg8–+ 26.f3 Rg4 27.hg4 d5 28.ed5 Nd5 29.Bd2 Qb6 30.Kh2 Qb5 31.Rac1 Kb8 32.Kg3 Nf4 33.Rb1 Qe2 34.Bf4 ef4 (34...ef4 35.Kh3 Qa2–+) 0–1. Krc,Milan (1930) – Hubka,Roland, Znojmo CZE Open, 2006.

5.Nf3 f5 6.c4 Nf6 7.Be2 =.

5.Nf3 f6 6.Be2 c6 (6...Nh6 7.d4+–) 7.a4 (7.Nc3 Nh6+=) 7...d5+= 8.0–0 (8.c4 dc4 9.0–0 cb5 10.ab5 Nd7=) 8...Nd7 (8...Bd6 9.c4 Ne7 10.d4+=) 9.d4 (9.Nc3 Nh6+=) 9...e4+= 10.Nfd2 f5 11.c4 Bd6 (11...Bb4 12.Nc3+=) 12.c5 (12.Nc3 Ngf6+=) 12...Bb8 (12...Bc7 13.Nc3+=) 13.f3 (13.Nc3 Ne7+=) 13...Ngf6+= 14.fe4 fe4 15.Nc3 0–0 16.b6 (16.Qb3!?+=) 16...Qe8=+ 17.Qe1 Qg6 18.Qh4 Re8 19.g3? (19.Rae1 h5–/+) 19...Ng4 (19...h5 20.Bc1–+) 20.Nd1 (20.Bg4!? Bg4 21.h3–/+) 20...Ndf6–/+ 21.Bg4? (better 21.Bc3–/+) 21...Ng4–+ (21...Qg4?! 22.Qg4 Bg4 23.Nf2=+; 21...Bg4?! 22.Nf2 Bc8 23.Ra3–/+) 22.Re1?! (22.Nb3 h5 23.Bc1 Qh6–+) 22...Rf8 (better 22...h5 23.Nf2 Nf2 24.Kf2 Qh6–+) 23.Rf1 Rf1 (23...h5 24.Rf8 Kf8 25.Nf2 Ne3 26.Re1–+) 24.Nf1 Qf6?? (better 24...Nf6–+) 25.Qf6=+ Nf6 (25...gf6 26.Nd2=) 26.Bc3 h5 27.Nf2 Ng4 (27...Kf7 28.Nd2=) 28.Ng4+= Bg4 29.Nd2 g5 30.Nb3 Bh3 31.Na5 h4?? (better 31...Bc8+=) 32.gh4+– g4 (32...gh4 33.Nb7 Kf8+–) 33.Nb7 g3 34.hg3 Bg3 35.Nd6 (35.Be1 Bc8 36.Bg3 Bb7 37.h5+–) 35...Bh4?? (better 35...Rf8 36.b7 Kh7+–) 36.a5 Kh7 (36...Bg5 37.b7 Rf8 38.a6 Be3 39.Kh2+–) 37.a6 Rg8 (37...Bg3 38.a7 Bd6 39.cd6+–) 38.Kh2 Bg4 39.a7 Bf3 40.Rg1 (40.Rg1 Rf8 41.b7+–) 1–0. DEFFM – GuestVMVP, freechess.org, 2019.

5.Nf3 Nf6 6.Be2 =.

5.Nf3 Nf6 6.Ng5 =.

4.e3 Be7

5.c4 Nf6 6.Nf3 0–0 7.Be2 (--> 1.b4 e5 2.Bb2 d6 3.c4 Nf6 4.e3 Be7 5.Nf3 0–0 6.Be2 a5 7.b5).

5.d4 ed4 6.Nf3 de3 (6...Nf6 7.Nd4 0–0 8.Be2=) 7.Bg7+= Bf6 8.Bh8 ef2 9.Kf2 Bh8 10.c3 Nf6 11.Bd3 Bg4 (11...Ng4!? 12.Ke1 h6+=) 12.Re1+– Kf8 13.h3 Bh5 14.Kg1 Nbd7 15.Bf5 Ne5 16.g4 Bg6 17.Bg6 Nf3 (17...hg6!? 18.Na3 Nfd7+–) 18.Qf3+– hg6 19.Qb7 Rb8 20.Qc6 Rb6 21.Qc4 Nd7 22.a4 Ne5 23.Qd5 (23.Qe4 d5 24.Qg2 Qe7+–) 23...Qh4 24.Re3 Qh6 25.Qa8 Kg7 26.Qe4 f5 (26...Kg8 27.Kg2 d5 28.Qd4+=) 27.gf5 gf5 28.Rg3 Kf6 29.Qa8 f4 (29...Qc1 30.Kh2 Ke7 31.Qh8 Qb2 32.Nd2 Qd2 33.Kg1+–) 30.Qd8 (30.Rg8 Bg7 31.Qd8 Ke6+–) 30...Kf5 (30...Ke6 31.Qc8 (31.Qc7 fg3 32.Ra2 Nf3 33.Kg2 Nh4 34.Kg3 Be5 35.Kf2 Qf4 36.Ke1 Qe4 37.Re2 Qb1 38.Kd2 Nf3 39.Ke3 Ng5 40.Qb6 Qg1 41.Rf2 Qe1 42.Re2 Qg3 43.Kd2 Qc3 44.Kd1 Qa1 45.Kd2 Nf3 46.Ke3 Qg1 47.Kf3 Qb6–+) 31...Kd5 32.Qg8 (32.Qc7 fg3 33.Qb6 Ke6=+) 32...Kc5 33.Nd2+–) 31.Qc8 (31.Qc7? fg3 32.Qc8 Ke4–+) 31...Kf6 (31...Qe6 32.Rg5! (32.Qh8?! fg3 33.Qh5 Kf6+=; 32.Qc7? fg3 33.Qh7 Ng6 34.Qh5 Kf6 35.Qf3 Ke7 36.Qg3 d5–+) 32...Kf6 33.Qd8 (33.Qh8 Kg5 34.Nd2 Nf7 35.Nf3 Kg6 36.Qg8 Kh6+–; 33.Qc7 Nf3 34.Kf2 Qe3 35.Kf1 Qe1 36.Kg2 Qe2 37.Kh1 Qh2) 33...Qe7 34.Rf5 (34.Qh8?! Kg5 35.Nd2 c6+=) 34...Ke6 35.Qe7 (35.Qh8?! Kf5 36.Nd2 d5=) 35...Ke7 36.Rf4+–) 32.Rg8 (32.Qc7 fg3 33.Qb6 Ke6=+ (33...Qh3?! 34.Qd6 Kg5 35.Qd2 Kg4 36.Qg2 Nf3 37.Kf1–+)) 32...f3 (32...Bg7 A) 33.Qc7 Qg6 34.Kf1 Qd3 35.Kf2 Qc2 36.Nd2 Qd2 37.Kf1 Qd3 38.Kf2 Qe3 39.Kf1 Qh3 40.Ke2 f3 41.Kd1 Qh1 42.Kc2 Qh7 (42...Qa1 43.Qg7 Ke6 44.Re8 Kd5 45.Qg8 Kc5 46.Rc8 Rc6 47.Rc6 Nc6 48.bc6 Qa4 49.Kd2 Qf4 50.Kc2 Qe4 51.Kb2–+) 43.Kb2 Qg8–+; B) 33.Nd2 Kf7 34.Qe8 (34.Qc7?! Kg8 35.Qb6 Qh3+=) 34...Kf6 35.Qd8 Kg6 36.Kf2 (worse 36.Qc7 Kh7+–) 36...Qh3 37.Rg1 Ng4 38.Rg4 Qg4 39.Rg7 Kg7 40.Qc7 Kg8 41.Qb6 Qg3 42.Ke2 Qg4 43.Ke1 Qg3 44.Qf2+–) 33.Rf8 (33.Rh8?? Qe3 34.Kh1 Qe1 35.Kh2 Qf2 36.Kh1 Qg2) 33...Kg5 (33...Kg7 34.Kh2 Qc1 35.Rg8 Kf6+–) 34.h4! Kg6 (34...Kh4 35.Rh8 Zwischenzug; 34...Qh4 35.Qf5 Double attack (35.Qd8 Decoy; 35.Rh8 Zwischenzug)) 35.Qe6 (35.Rh8?? Qe3 36.Kh1 Qe1 37.Kh2 Qf2 38.Kh1 Qg2) 35...Kh7 36.Qg8 1–0. onur604 (2285) – wow1972 (2110), lichess.org, 2020.

5.d4 e4 6.c4=.

4.e3 f5

5.a4 Nf6 6.c4 Be7 7.Nf3 0–0 8.Be2 Nbd7 9.0–0 Ne4 (9...e4 10.Nd4 Nc5 11.Nc3=) 10.h3 Ndf6 11.Nc3 Nc3 12.Bc3 Be6 (12...e4 13.Nd4=) 13.d4 e4 14.Nd2 d5 15.cd5 Nd5 16.f3?? (better 16.Bc4=) 16…Nc3–+ (16...Nc3 17.Qe1 Bh4–+) 0–1. RichardSommer (2075) – Guy_de_Enpassant (2185), lichess.org, 2020.

5.c4 Nf6 6.a4 Be7 7.Nf3 0–0 8.Be2 c6 9.0–0 Be6 (9...e4 10.Nd4=) 10.d4+= e4 11.Nfd2 d5 12.Nc3 Nbd7 (12...dc4 13.Nc4 Bb4 14.Rc1=) 13.Qb3 (13.c5 cb5 14.ab5 Qe8+=) 13...Bf7 14.f4 (14.c5 Nc5 15.dc5 d4=) 14...ef3 (14...Rc8 15.Rac1=) 15.Bf3 (15.Rf3 Ne4 16.Rd1 Qc8+=) 15...Ne4 (15...dc4 16.Qc2=) 16.Nde4 (16.Be4 fe4 17.cd5 cd5 18.Nd5 Bd6+=) 16...fe4= Black gets strong initiative. 17.Bg4 (17.Be2 Bb4=) 17...Nf6 18.Bh3 (18.Be2 Rc8=) 18...dc4=+ 19.Qc2 Bd5 20.Bf5 The pressure on the isolated pawn grows 20...Bd6 21.h3 (21.bc6!? bc6 22.g3=+) 21...Qe7 22.Rae1? (better 22.bc6 bc6 23.h4–/+) 22...g6–+ 23.Bg4 (23.bc6 bc6 24.Bg6 hg6–+) 23...Ng4 24.hg4 (24.bc6 Bc6 25.Qe2 Bd7 26.hg4 Qh4–+) 24...Qh4 25.g3 Bg3 26.Qg2 (26.Rd1–+) 26…Be1 (26...Be1 27.Nd5 cd5–+) 0–1. BeepBeepImAJeep (2740) – IMFAR (2620), lichess.org, 2019.

5.c4 Nf6 6.Qc2 Be7 7.Nc3 0–0 8.Nd5 Be6 9.Ne7 Qe7 10.Nf3 Ne4 11.h4 c6 12.d3 Nc5 13.d4 Ne4 14.a4 ed4 15.Nd4 cb5 16.ab5 Nd7 17.Be2 Ndc5 18.g3 Bd7 19.0–0 Rf6 20.h5 Rh6 21.Kg2 a4 22.Rh1 Re8 23.Ra3 g6 24.f3 Qg5? (better is 24...Nf6 25.hg6 Rh1 26.Kh1 hg6=) 25.fe4+– Ne4 26.Rh3 (26.Qa4?? Qg3 27.Kf1 Qf2) 26...f4 27.ef4 Bh3 28.Kh3 Qc5 29.Re3?? (better is 29.Ra4 d5 30.Bf3 gh5 31.cd5 Qd5 32.Kg2+–) 29...Nf2+/– 30.Kg2 Re3 31.Kf2 Re8 32.Qc3 gh5 33.Bf3 h4 34.Bd5 Kf8 35.Kf3 Rg6?? 36.Nf5+– Re3 37.Qe3 Qe3 38.Ke3 hg3 39.Bg2 Re6 40.Kf3 Kf7 41.Kg3 Re2 42.Bd5 Kg6 43.Nh4 Kh6 44.Bf7 (44.Bf7 Re3 45.Kf2 Re5 46.Be5 de5 47.Nf5) 1–0. Senkyr,Vladimir (2185) – Sojka,Ales (2115), CZE–chT1E, 2009.

5.c4 Nf6 6.d3 b6 7.Nf3 Be7 8.Be2 Bb7 9.a4 (9.0–0) 9...0–0 10.Nc3 Nbd7 11.d4 h6 12.Nh4 Ng4 13.Ng6 ed4 14.Nf8 dc3 15.Ne6 cb2 16.Nd8 ba1Q 17.Qa1 Rd8 ½–½. Brueckner – Blankenberg,Bruno, Bezirkseinzel, 1984.

5.c4 Nf6 6.Be2 Be7 7.Nf3 0–0 8.0–0 e4 9.Nd4 c5 10.Nc2 Nbd7 11.Nc3 Ne5 12.d4 ed3 13.Bd3 Be6 14.a4 (better is 14.Qe2!?=) 14...Nc4–/+ 15.Rb1 Nb2 16.Rb2 d5 17.Be2 Qd6 18.Bf3 Qe5 (19.Qd3 Ne4–+) 0–1. hertford (2190) – Mustangace (2125), ChessWorld.net, 2003.

5.Bc4 Nf6 6.Nf3 (6.Nc3 Nbd7+=) 6...d5= 7.Be2 e4 8.Ne5 (8.Nd4 c5 9.bc6 Nc6=) 8...Nbd7 9.Bh5 (9.Nd7 Bd7 (worse 9...Kd7 10.c4+–) 10.c4 Bd6=) 9...g6=+ 10.Ng6 (10.Be2!?=+) 10...hg6–/+ 11.Bg6 Ke7 12.Bf5 Nb6 13.Bc8 Qc8 14.f3 Bg7 (14...Qe6 15.Bd4 Qd6 16.f4–/+) 15.0–0 (15.fe4 de4 16.Bd4 Qe6–/+) 15...Qe6–/+ 16.Bd4 (16.d3 Rag8 17.Bd4 ef3 18.Qf3 Ng4–+) 16...Rag8 17.Nc3 Kd6 (17...Ne8!? 18.Qe2 Bd4 19.ed4 Qh3–+) 18.Ne2 Nh5 (18...Nfd7 19.Ng3 Bd4 20.ed4=+) 19.fe4= Bd4 20.Nd4 (20.ed4 Qe4 21.Rf2 Qh4–+) 20...Qe4 21.Qe2 1–0. GuestRXWT – GuestZKQC, freechess.org, 2019.

5.d4 e4 6.c4 Nf6= 7.g3 (7.Ne2 Be7=) 7...Be7=+ 8.Bg2 0–0 9.Ne2 (9.f3 ef3 10.Nf3 d5=+) 9...c6 (9...d5 10.cd5 Bb4 11.Bc3 Nd5 12.Qa4=+) 10.a4 (10.0–0 cb5 11.cb5 Nd5=+) 10...Be6 11.Nd2 Nbd7 12.0–0 Rc8 13.f3 d5 (13...cb5 14.ab5 Bc4 15.Nc4 Rc4 16.Bc3=+) 14.c5 (14.Nf4 Bf7 15.cd5 cd5=) 14...b6 (14...ef3 15.Bf3 Ne4=) 15.Nb3 (15.Nf4!? Bf7 16.cb6 Qb6 17.bc6 Qb2 18.cd7 Nd7 19.Rb1=+) 15...bc5 16.dc5 (16.Nf4 Bf7 17.dc5 Nc5 18.Bf6 Bf6 19.Nc5 ef3 20.Bf3 Qe7+–) 16...Nc5 (16...ef3 17.Bf3 Nc5=+) 17.Ned4=+ Bd7 18.bc6 Bc6 19.Nc5 Bc5 20.Ne6 (better is 20.Nf5!? ef3 21.Qf3–/+) 20...Be3–/+ 21.Kh1 Qb6 22.Rb1? (22.Nf8 Qb2 23.Ne6–+) 22...Qa7?? (better is 22...Ba4 23.Qa4 Qe6 24.Bf6 Rf6 (24...Qf6?! 25.fe4 Rc4 26.Qa2–/+) 25.Qa5 Rff8–+) 23.Nf8=+ Rf8 24.Qc2 Bd7 25.Rbd1 Be6 26.Qc6 Bd7 27.Qc2 Be6 28.Bf6 gf6 29.Qc6= Qb6 30.Qb6 Bb6–/+ 31.Rb1 Bc5 32.Rb5 Bb4 33.Rb6 Bd7 34.Rb7? Bc8 35.Rb5 e3 36.Rb4?? ab4–+ 37.f4 d4 38.Kg1 d3 39.Bf3 e2 40.Bd5 Kg7 (41.Re1 d2–+) 0–1. Seyfryd – Dufek,J, KP, 1989.

5.d4 e4 6.d5 Nf6 =.

5.d4 e4 6.Ne2 d5 7.c4 (7.Nf4 Nf6 8.Be2 Bb4 9.Nc3 0–0 10.a3 Be7 11.h4; 7.Nbc3 Nf6 (7...Bb4 8.Nf4 Nf6 9.Be2 0–0 10.h4 c6 11.0–0) 8.Nf4 Bb4 9.h4 0–0 10.Be2 c6 11.0–0) 7...c6 (7...Nf6 8.Nbc3+/– Bd6 9.c5 Be7 10.Qb3 0–0 11.Nf4; 7...Bd6 8.c5 Be7 9.Nbc3 Nf6 10.Qb3 0–0 11.Nf4) 8.a4 (8.bc6 bc6 9.Nbc3 (9.cd5 Nf6 10.dc6 Qb6 11.Qd2) 9...Nf6+/– (9...Bd6 10.cd5 Ne7 11.dc6) 10.Nf4 Bd6 11.Be2; 8.Nf4 Nf6 9.cd5 cd5 10.Nc3 Bd6 11.Be2) 8...Be6 (8...Nf6 9.Nbc3+= Bb4 10.Nf4 0–0 11.cd5) 9.Ba3 (better is 9.Nf4!? Qd7 10.cd5 cd5 11.Nc3+/– 1.07 (11.Be2+/–); 9.bc6 Nc6 10.Nf4 Bb4 11.Nd2) 9...Ba3 10.Na3 Nf6 (10...dc4? 11.Nf4 Bf7 12.Bc4+–) 11.Nf4 Bf7 12.h4 Qe7 13.c5 Nbd7 14.Qc2 (14.Rb1 0–0+=) 14...Nf8 (14...Nh5 15.Nh5 Bh5 16.Be2 Be2 17.Qe2+=) 15.b6 (better is 15.Rb1!? Ne6 16.Ne6 Qe6 17.bc6 bc6 18.Rb6+=) 15...Ne6 16.Ne6 Qe6 17.g3 Bh5 18.Nb1 (18.Bg2 Kf7+=) 18...h6 (18...Bf3 19.Rg1–/+) 19.Nd2 0–0 20.Nb3 (20.Bg2 Rfe8+=) 20...g5 (20...Bf3!? 21.Rg1 Qe7–/+) 21.hg5= hg5 22.Be2 Bf3 23.Bf3 ef3 24.0–0–0 Kg7 25.Kb2 Rh8 26.Nc1 (26.Rh8 Rh8 27.Na5 Qd7 28.Nb7 Qb7 29.Qf5 Rh2 30.Qg5 Kf7=) 26...Rh1 (26...Ne4 27.Rdf1+=) 27.Rh1= Ne4 28.Nd3 Rh8 29.Rh8 Kh8 30.Qd1 g4 31.Qh1= Kg7 32.Qh5 Qg6 33.Qg6+= Kg6 34.Kc2 Kf7? 35.Kd1+– Nc3 36.Ke1 Ke8 37.Nc1 Kd7 38.Nb3 Na4?? 39.Na5 Kc8 40.Kd2 Nb2 41.Kc2 Nc4 42.Nc4 dc4 43.Kc3 Kd7 44.Kc4 Kc8 45.d5 Kd7 46.Kd4 1–0. Ramos Moreno,FJ (2105) – Perez Guerra,Alberto (1865), Malaga ESP, Regional Ch, 2013.

5.d4 e4 6.Ne2 Nf6 A) 7.Nbc3 d5 (7...Be7 8.d5 Nbd7 9.Nf4 Nc5 10.Bc4 Ng4 11.Ne6) 8.Nf4 Bb4 9.Be2 0–0 10.h4 c6 11.0–0; B) 7.Nf4 d5 (7...g5 8.Nh5 Nbd7 9.Nc3 d5 10.Be2 Nb6 11.h4) 8.Be2 Bb4 9.Nd2 g5 10.c3 Be7 11.Nh5; C) 7.c4 Be7 (7...Nbd7 8.Nbc3 Nb6 9.Nf4 Be7 10.Be2 0–0 11.0–0) 8.Nf4 0–0 9.Nc3 g5 10.Nfd5 Nd5 11.Nd5.

5.Nf3 Nf6 6.c4 g6 7.Qc2 Bg7 8.Be2 0–0 9.0–0 Nbd7 (9...e4 10.Ne1=) 10.d4+= e4 11.Nfd2 c5 12.f3 (12.Nc3 Qc7+=) 12...cd4 13.Bd4 Nc5 14.fe4 Nce4 (14...fe4 15.Nc3 Bf5 16.Rad1+=) 15.Ne4+= Ne4 16.Bg7 Kg7 17.Nd2 Nc5 18.Bf3 a4 19.Bd5 Qe7 20.e4 (20.Rae1 Be6+=) 20...f4 (20...Qf6 21.Rad1+=) 21.Qc3 (21.Nf3 Bg4+=) 21...Qe5= 22.Qe5 de5 23.Nf3 Re8 24.h4 (24.Rad1 Bg4=) 24...Kf6 (24...Bg4 25.Rad1=) 25.Rab1 (25.g3!?=) 25...h6=+ 26.Rbd1 Bg4 27.Rd2 (27.a3 Rad8=+) 27...Rad8 28.Nh2 Bc8 29.Rdd1 g5 30.hg5 hg5 31.g3 (31.Kf2 Rh8 32.Kg1 Rh6–/+) 31...Rh8 32.gf4 ef4 33.Rfe1 g4 34.e5 Ke7 (better 34...Kf5–/+) 35.e6? (35.Rd4 Ne6 36.Rdd1 Rh3–/+) 35...Rdg8 (better 35...Rh4!?–+) 36.Re5? (better 36.Rd4!? Rg7 37.Rf4–/+) 36...Be6 (36...Ne6 37.Re4 g3 38.Nf3=+) 0–1. GuestMKNW – GuestJKKF, freechess.org, 2017.

5.Nf3 Nf6 6.c4 g6 7.d4 e4 8.Nfd2 Bg7 9.Be2 0–0 10.Nc3 Qe8 11.g3 c6 12.a4 c5 13.Nb3 Qe7 14.Qd2 Be6 15.d5 Bf7 16.0–0–0 Nbd7 17.Rdg1 Ne5 18.Kc2 Nfd7 19.Nc1 Nb6 20.Kb3 Rfc8 21.h4 h6 22.Qd1 Kf8 23.N1a2 Bf6 24.Nb1 Ke8 25.Nac3 Kd8 26.Nd2 Kc7 27.Ba1 Rg8 28.h5 gh5 29.Bh5 Bh5 30.Qh5 Bg5 31.Qh3 Raf8 32.Qf1 Nbd7 33.Ne2 Ng4 34.Nf4 Bf4 35.gf4 Ndf6 36.Qe2 h5 37.Bf6 Nf6 38.Rg5 Qh7 39.f3 Rg5 40.fg5 ef3 41.Qf3 Ng4 42.e4 Qg6 43.ef5 (Better is 43.Qf4!?+=) 43...Rf5 44.Qe4 Ne5 45.Rh5 Rf3! 46.Kc2 Qh5 47.Nf3 Qf3 48.Qh7?? Kb6–+ 49.Qe7 Qd3 50.Kc1 Nc4 51.Qd8 Ka7 52.b6 Ka6 53.Qa8 Kb6 54.Qd8 Ka7 (55.Qf6 Qd2 56.Kb1 Qd1 57.Ka2 Qa4 58.Kb1 Qd1 59.Ka2 Qc2 60.Ka1 a4 61.Qh8 a3 62.Qc3 Qc3 63.Ka2 Qb2) 0–1. Franke,Roland (1885) – Neukirch,Detlef (2200), Bahn–chM Bad Wildungen, 2000.

5.Nf3 Nf6 6.Be2 Nbd7 7.0–0 Nb6 (7...Be7 8.Ng5 Nb6 9.f4=) 8.c4 Be6 (8...Be7 9.c5 Nbd5 10.cd6 cd6 11.Nc3=) 9.Qc2 (9.d3 Be7+=) 9...c5 (9...Be7 10.Ng5 Bd7 11.d4+=) 10.bc6 (10.d4 cd4 11.ed4 e4+=) 10...bc6 11.Ng5 (11.c5 Nbd5+=) 11...Qd7 (11...Bd7 12.d4 e4 13.Nd2+=) 12.d4 (12.f4 e4+=) 12...e4 13.Qb3 (13.f3+=) 13...Nc8 (better 13...Rb8=) 14.Ne6+– Qe6 15.Qb7 (15.Qb7 Ra7 16.Qc6 Qd7 17.Qd7 Kd7 18.Nd2+–) 1–0. DEFFM – GuestDMF, freechess.org, 2018.

5.Nf3 Nf6 6.Be2 Be6 7.d4 Nbd7 (7...e4 8.Ng5 Bg8 9.0–0+=) 8.c4 (8.de5 de5 9.Ne5 Bb4 10.c3 Bd6+–) 8...e4 9.Ng5 Bg8 10.0–0 g6 11.Nh3 Bg7 12.Nf4 White intends d5 12...Bf7 13.d5 0–0 14.f3 (14.Bd4 Nc5+=) 14...Re8 15.fe4? (15.Bd4 g5 16.Nh3 ef3 17.gf3 Bg6=) 15...Ne4 (better 15...Nd5!? 16.Bg7 Ne3–/+) 16.Bg7 Kg7 17.Qd4 (17.Bf3 Qf6 18.Na3 Ng5=) 17...Qf6 18.Qf6 (18.Na3 Nc3 19.Qd2 Nc5=) 18...Ndf6 (better 18...Nef6 19.Nd2 Re3–/+) 19.h3? (better 19.Nd3=+) 19...g5–+ 20.Ne6 Be6 21.de6 Re6 (better 21...Ng3!? 22.Re1 Nfe4–+) 22.Rf5–/+ Ng3?? (better 22...Rae8–/+) 23.Rg5+– (23.Rg5 Kh6 24.Rg3+–) 1–0. GuestHKDP – GuestKFRS, freechess.org, 2019.

5.f4 e4 6.Qh5 Ke7 (6...g6 7.Qd1 Nf6 8.Bc4=) 7.Nh3 Nf6 8.Qh4 Kf7 9.Ng5 Kg8 10.Bf6 Qf6?? (better is 10...gf6 11.Nh3 Be6+=) 11.Bc4+– (11.Bc4 Be6 12.Be6 Qe6 13.Ne6+–) 1–0. mikebaldini (1610) – sonata296 (1740), gameknot.com, 2015.

4.e3 Nf6

(--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5).

5.c4 Be7 6.Nf3 0–0 7.Be2 (--> 1.b4 e5 2.Bb2 d6 3.c4 Nf6 4.e3 Be7 5.Nf3 0–0 6.Be2 a5 7.b5).

5.Nf3 Be7 6.c4 (--> 1.b4 a5 2.b5 Nf6 3.Bb2 d6 4.e3 e5 5.c4 Be7 6.Nf3).

4.e3 g6

5.c4 (--> 1.b4 a5 2.b5 e5 3.Bb2 d6 4.c4 g6 5.e3).

5.Bc4 Bg7 6.a4 Ne7 (6...Nf6 7.Nf3=) 7.d3 (7.e4 f5 8.d3 c6=) 7...0–0 8.Nd2 Nd7 9.Ngf3 Nc5 10.0–0 Nf5 (10...d5 11.Ba3 b6 12.Bb3=) 11.e4+= Nh6 12.c3 Be6 13.Re1 Bc4 14.Nc4 (< 14.dc4 Nd3 15.Re2 Nb2–/+) 14...Ne6 15.d4 ed4 16.cd4 Ng5 (16...d5 17.ed5 Qd5 18.Ne3+=) 17.Ng5+/– Qg5 18.Bc1 (18.Qf3 Ng4+/–) 18...Qg4 (18...Qh4 19.Bh6 Bh6 20.b6+/–) 19.f3 (19.Bh6 Qd1 20.Rad1 Bh6+/–) 19...Qe6 20.d5 Qf6 (20...Qd7 21.Ra2+/–) 21.Bb2 Qg5 22.Bg7 Kg7 23.Rc1 b6 24.Qd4 Kg8 25.Ne3 (25.Qd2 Qh4+–) 25...Qe7 (25...Rac8 26.Rc6 f5 27.Rec1 fe4 A) < 28.Qe4 Rce8 29.f4 Qh4–/+ (29...Re4?! 30.fg5 Nf5 31.Nf5 Rf5 32.Rc7=; 29...Qf4?! 30.Qf4 Rf4 31.Nc4=+); B) 28.Rc7+/–) 26.Rc6 f6 27.Rec1 Rac8 (27...Ra7 28.Qc3 Rf7 29.Re1+–) 28.Qc3 Rf7 (28...f5 29.e5 Qe5 30.Qe5 de5 31.d6+– (31.Rc7?! Rc7 32.Rc7 Rd8+/–)) 29.Nc4 (better is 29.Rb6 f5 30.Rc6 (30.Qa5?! fe4 31.f4 g5+=) 30...fe4 31.b6+–) 29...Rff8?? (better is 29...Rd8+–) 30.Nb6! cb6 31.Rc8 Nf7 32.Rc7 Qd8 33.Qc6 (33.Qd4 f5 34.ef5 gf5 35.Qb6 Qf6+–) 33...Ne5 (33...f5 34.ef5 Qf6 35.Qb6 Qf5 36.Qa5 Qd5+–) 34.Qb6 (34...f5 35.f4+–) 1–0. Norbeck – R Johnsson, Ingelstad 1987.

5.d4 Nd7 6.a4 Bg7 7.Nf3 ed4 (7...e4 8.Nfd2 d5 9.c4=) 8.Nd4 (8.Bd3 Ngf6 9.Bd4 c5+=) 8...Ngf6 9.Nd2 (9.Bd3 0–0+=) 9...0–0 10.Be2 (10.Bd3 Re8=) 10...Nc5 11.0–0 Nfd7 (11...Be6 12.Bc4=) 12.c4 (12.N2f3 Re8+=) 12...Qe7= 13.Ra3 Ne6 (13...Ne5 14.N2b3=) 14.Bf3 (14.Ne6 fe6 15.Bg7 Kg7=) 14...Ndc5 15.Ba1 (15.Bd5 Re8=) 15...Ng5 16.Bd5 Be6 17.e4 (17.N4b3 Ba1 18.Ra1 Bd5 19.cd5 Nge4+=) 17...Bd7 (17...Rae8 A) < 18.Ne6 fe6 (< 18...Nge6 19.Bg7 Kg7 20.Nb3+=) 19.Bg7 Qg7–/+; B) 18.Re3=) 18.f4 Nge6 19.Nf5?? gf5–+ 20.ef5 Nd4 21.Rg3? Nf5 22.Qg4 Rfe8?? 23.Bg7–/+ Ng3 24.Qg3 Qe3 25.Qe3 Re3 26.Bh6? Rae8–+ 27.f5 Re1 28.g4 Rf1 29.Kf1 c6 30.Bf3 f6 31.Bf4–/+ Rd8 32.Bd1 Be8 33.Be3 Bf7 34.Bd4 Nd7 35.Be2 d5 36.c5=+ Ne5 37.b6 Nc4 38.Nb3 Re8 39.Bc4 dc4+/– 40.Na5 Re7 41.Bf6 Rd7 42.Ke2 Kf8 43.Bc3 Rd3 44.Nb7 Rc3+= 45.Nd6 Rb3 46.Nf7 Rb2 47.Ke3 (47...Kf7 48.Kd4+/–) 1–0. Schweber,Samuel (2345) – Saldano,Horacio (2325), Villa Ballester MAG, 1995.

5.d4 Bg7 6.de5 Nd7 7.Nf3 Ne7 8.Bc4 (< 8.ed6 Bb2 9.de7 Qe7=+) 8...de5 (better is 8...0–0!?+=) 9.Ng5+/– 0–0 10.Ba3 (better is 10.Bf7 Rf7 11.Ne6+/–) 10...h6?? (better is 10...Qe8=) 11.Bf7+– Rf7 12.Ne6 Qe8 13.Nc7 Qf8 14.Na8 e4 15.c3 Ne5 (16.0–0 Bg4 17.Be7 Re7 18.Qd5 Be6+–). Montag,Wilfrid Franz – Christ,Heinz, corr FRG jub40 qg39 corr8687, 1986.

5.Nf3 Nf6 =.

5.Nf3 Bg7 6.c4 Nd7 7.Be2 f5 (7...Ngf6 8.d4=) 8.Nc3 (8.0–0 Ngf6+=) 8...Ngf6 9.d4 0–0 10.0–0 Kh8 11.a4 Qe7 (11...c5 12.de5 de5 13.Nd5 Nd5 14.cd5=) 12.Qc2 Nb6? (better is 12...e4!? 13.Nd2 Nb6+=) 13.de5+– de5 (13...Ne4 14.ed6 cd6 15.Rfd1+–) 14.Ba3 Qe8 15.Bf8 Bf8 16.Rfd1 Bd6 (16...e4 17.Nd4+–) 17.Na2 (17.e4 Qg8+–) 17...Ne4 18.Nc3 Nc5?? (18...Nf6 19.e4 Qg8+–) 19.Nd5+– Nd5 20.cd5 b6 21.Bc4 Qe7 22.Qb2 (22.Rac1 f4+–) 22...Bd7 23.Nd2 Kg8 24.Ra2 Rf8 25.Qc2 Kf7 (25...e4 26.g3+–) 26.Be2 Ke8 (26...Kg7 27.Nc4+–) 27.Nc4 Kd8 (27...f4 28.e4+–) 28.Nd6 cd6 29.Rc1 Rf7 30.Qc3 (30.Ra3 Rf8+–) 30...Rf8 31.Rac2 (31.Qc4 Qg5 32.Rc3 e4+–) 31...Qf7 32.f3 h5 33.Qc4 Qe7 34.Rc3 h4 35.R3c2 f4+/– 36.e4 Rh8 37.h3 Rh5 38.Kh1+–. Hohenberger – Kempe, 1973.

5.Nf3 Bg7 6.c4 Ne7 7.Qc2 Nd7 8.d4 0–0 9.Be2 b6 (9...ed4 10.Bd4 Ne5 11.0–0=) 10.0–0+= Bb7 11.Rd1 f6 12.Nc3 Kh8 13.Ba3 Qe8 14.c5 dc5 15.dc5 c6 (better is 15...Nc5!? 16.Bc5 bc5+=) 16.Ne4 bc5 17.Nc5 Nc5 18.Qc5 (18.Bc5?! cb5 19.Qb1 Bc6=) 18...Nf5 19.Qb6 Rf7 20.Rd2 e4 21.Ne1 Rd7? (better is 21...cb5 22.Bb5 Qe5+–) 22.Rd7+– Qd7 23.Rd1 Qc8 24.g4 Nh6+= 25.Be7 Nf7 26.h3 cb5 27.Bf6 Qc6 28.Bg7+/– Kg7 29.Qb5 Qb5 30.Bb5 Ne5 31.Rc1 Ba6 32.Ba6 Ra6 33.Rc5 Kf6 34.Nc2 Rb6? 35.Nd4 Rb1+/– 36.Kg2 Nd3 37.g5 Ke7 38.Ra5 Rb2 39.Kg3 Rf2 40.Ra7 Kd6 41.a3 Rf1+/– 42.Rh7 Rg1 43.Kh2 Rg5 44.Rh4 Kd5 45.Rg4 Rh5? 46.Rg6+– Nf2 47.Kg3 Nh3+/– 48.a4 Kc4 49.a5! Kd3 50.a6 Ke3 51.a7 Ra5 52.Nc6 Ra3 53.Kh3 Kf2 54.Kh2 e3 55.Rf6 Ke1 56.Rf8 e2 57.a8Q Ra8 58.Ra8 Kf2 59.Rf8 Ke3 60.Re8 Kf2 61.Nb4 e1N 62.Kh3 Nf3 63.Nd3 Kf1 64.Kg3 (64.Kg3 Kg1 65.Kf3 Kh2 66.Rh8 Kg1 67.Nf2 Kf1 68.Rh1#) 1–0. Gimeno Higueras,Roberto (2025) – Ferron Garcia,Carlos (2310), Mislata op, 2004.

5.f4 Bg7 6.Nf3 Nd7 7.Be2 Ngf6 8.fe5 de5 9.0–0 = (9.Ne5? Ne4–+; 9.Be5? Ne5 10.Ne5 Ne4–+).

5.f4 Bg7 6.Nf3 Nd7 7.Be2 Nh6 8.0–0+= 0–0 9.fe5 de5 10.e4 c6 (10...f5 11.Bc4 Kh8 12.Qe2+=) 11.Nc3 Ng4 (11...f5 12.Bc4 Kh8 13.Ba3 Qb6 14.Kh1+=) 12.Qe1 a4 13.Ba3 Re8 (13...Qb6 14.Kh1 c5 15.Qh4+=) 14.Qg3 Nf8 (14...Ngf6 15.bc6 bc6 16.Rab1+/–) 15.Bc4 Nh6 (15...cb5 16.Bb5 Bd7 17.Rab1+/–) 16.bc6 bc6 17.Rab1 Ba6 (17...Be6 18.Be2+/–) 18.Ba6 Ra6 19.Bc5 f5 20.Qg5 (20.Bf2 Ne6+=) 20...Ne6 21.Qd8 Rd8= 22.Ba3 Nd4 23.Rb2 Raa8 24.d3 Ng4 25.Re1 Bh6 26.Ne2 Be3 27.Kf1 Nb5 28.Bb4 fe4 29.de4 Ba7 30.Nc1 Ne3–+ 31.Re3 Be3 32.Nd3 Bd4 33.Rb1 Rab8 34.Be7 Nc3–+ 35.Re1 Re8 36.Bd6 Rbd8 37.Be5–/+ Be5 38.Nfe5 Rd4 39.Nc6–/+ Rf8 40.Kg1 Re4 41.Re4 Ne4 42.g3 a3 43.c4 Nc3 44.Ndb4 Nd1 45.c5? Ne3–+ 46.h4 Rf1 47.Kh2 Rc1 48.Nd3 Rc2 49.Kh3 Ra2 (50.Ncb4 Ra1–+) 0–1. Labahn,Wolfgang (2225) – Meszaros,Andras (2390), Eger, 1993.

5.f4 Bg7 6.Nf3 Nd7 7.Be2 Nh6 8.h3 0–0 9.0–0 Nf5 10.c4 (better is 10.fe5!? Ne5 11.Ne5 de5 12.Nc3=) 10...e4–/+ 11.Bg7 ef3 (11...Ng7?! 12.Nd4=) 12.Bf8 fe2 13.Qe2 Ng3 14.Qf3 Nf1 15.Qf1?? (better is 15.Bh6 Qh4 16.Bg5=) 15...Nf8–+ 16.Nc3 Bd7 17.Qf3 b6 18.Nd5 Rc8 19.h4 Be6 20.h5 Bd5 21.Qd5 Qf6 22.Rf1 Qe6 23.Qd3 Nd7 24.Rf3 Nc5 25.Qd4 Qe4 26.Qf6 Qf5 27.Qh4 Ne4 28.h6?? Nd2 29.Rg3 Ne4 30.Qe7 Ng3 (30...Ng3 31.Kh2 Ne2–+) 0–1. elsh1403 (1625) – peta1234 (1790), kurnik, 2011.

4.e4 Bd7

4.e4 Be6

5.a4 Nd7 6.h3 (6.Nf3 Ngf6 7.Ng5 Be7=) 6...Nc5 7.d3 Be7 8.Nf3 f5 (8...Qd7 9.Nbd2=) 9.d4 (9.ef5 Bf5 10.d4 ed4 11.Nd4= (worse 11.Qd4 Bf6 12.Qe3 Kf8=+)) 9...Ne4=+ 10.de5 (10.Bd3 Ngf6=+) 10...d5 (10...de5!? 11.Qd8 Rd8=+) 11.Bd3= Bc5 12.Bd4 Qe7 13.Nbd2 Nh6 14.Nb3 Bb4 15.Nfd2 0–0 16.0–0 Qg5 17.Nf3 Qg6 18.Qc1 f4 19.Kh2 Qh5 20.c3 Be7 21.Be4?? (better 21.Re1=) 21...de4–+ 22.Nfd2 e3! 23.Ne4? (23.fe3 Ng4 Double attack (23...Ng4 Decoy; 23...fe3 Passed pawn)) 23...Bb3 24.c4 f3 25.g4 (25.Ng3 Qh4 26.Be3 Ng4 27.Kg1 fg2 28.Kg2 Ne3 29.Qe3 Bc4 30.Qe4 Bf1 31.Rf1 Qe4 32.Ne4–+) 25...Ng4 26.Kg3 (26.Kg1 Qh3 27.Nf6 Bf6 28.ef6 Qg2) 26…Qh4 0–1. alessandrocarvalhaes (1770) – foorpeet (1795), lichess.org, 2019.

5.a4 Nf6 6.d3 Nbd7 7.Nd2 Nb6 (7...d5 8.ed5 Nd5 9.Ngf3=) 8.Ne2 g6 9.f4 ef4 10.Nf4 Bg7 11.Be2 0–0 12.0–0 d5 13.e5 Nfd7 14.d4 Qe7? (14...Bh6 15.Nb3+–) 15.c3?? (15.Ba3 Qg5 16.Bf8 Bf8+–) 15...f6? (better 15...Rfe8+=) 16.Ba3+– (16.Ne6?! Qe6 17.Bg4 f5+=) 16...Qe8 17.Bf8 Qf8?? (better 17...Bf8 18.ef6 Nf6+–) 18.Ne6 Qd6 (18...Qe7 19.ef6 Nf6 20.Ng7 Kg7+–) 19.Ng7 (19.Ng7 fe5 20.Nh5 gh5 21.Bh5+–) 1–0. alessandrocarvalhaes (1890) – Leopard_27rus (1905), lichess.org, 2020.

4.e4 f5

5.d4 Nd7 6.ef5+/– Ngf6 7.g4 (7.Qe2 Qe7+/–) 7...h6 (7...ed4 8.Be2 d5 9.Bd4+=) 8.Bg2 ed4 9.Bd4 Qe7 10.Kf1 (10.Kd2 Ne5 11.h3 c6+/–) 10...Ne5 11.h3 Bd7 12.a4 0–0–0 13.Nd2 (13.Qe1 b6+/–) 13...h5 (13...g5 14.fg6 Rg8 15.Qe1+/–) 14.g5+/– Ne8 15.f4 Bf5 16.fe5 de5 17.Be3 (17.Qf3 Rd4 18.Qf5 Kb8+–) 17...Nd6 18.Ngf3 (18.Ke1 g6+/–) 18...g6 (18...Nc4 19.Qe1 Na3 20.Ra3 Qa3 21.Ne5=) 19.Qb1 (19.Qc1 Bg7+/–) 19...Bg7 20.Qb2 Rhf8 21.Ke2 e4 22.Nd4 Qd7 (22...Be6 A) 23.Be4 Ne4 24.Rhe1 Qc5 25.Ne4 Qc4 26.Kd1 Bd4 (26...Rd4?! 27.Bd4 Bd4 28.c3=) 27.Bd4 Rd4 (27...Qd4?! 28.Qd4 Rd4 29.Kc1–/+) 28.Nd2 Rd2 29.Kd2 Qd5 30.Kc1 Qg5 31.Kb1 Qh4+=; B) 23.c3+/–) 23.c3 Be5 24.Rac1?? Bg4!–/+ 25.hg4 Qg4 26.Bf3 ef3 27.N4f3?? Qg2 28.Bf2 Rde8 29.Rcf1 (29...Bc3 30.Kd1 Bb2 31.Rh2–+). Barnard,J – Kunz,R, Los Angeles, California, 1972.

5.d4 fe4!? 6.Nd2 ed4 7.Ne4 Qe7 =.

5.ef5 Bf5 6.Qf3 Qc8 7.Bc4 =.

5.ef5 Nf6 6.Qf3 Nbd7 7.Bc4 Nc5 8.Nc3 Qd7 9.g4 h5 (9...Kd8 10.0–0–0–/+) 10.g5 e4? (Better is 10...d5 11.Nd5 Nd5 12.Bd5 Qf5–/+) 11.Qe2+– d5 12.gf6 dc4 13.Ne4 Ne4 (13...Kd8 14.fg7 Bg7 15.f6+–) 14.Qe4 Kd8 15.fg7 Bg7 16.Qh4 Qe7 17.Qe7 Ke7 18.Bg7 Rg8 (18...Re8 19.f6 Kf7 20.Kf1+–) 19.f6 (19...Kf7 20.d4 cd3 21.cd3+–) 1–0. b4_player (2140) – hongkongfui (1940), GameColony.com, 2002.

5.ef5 Nf6 6.Qf3 Be7 7.Nc3 0–0 8.Bc4+= Kh8 9.Be6 Nbd7 10.Nh3 Nc5 11.Ng5 Be6 12.fe6 Qc8 13.Qh3+/– Kg8 14.Nd5!+– (14...Re8 15.Nf6 Bf6 16.Qh7 Kf8 17.0–0+–) 1–0. woschkat – bigman, net–chess.com, 2000.

4.e4 Nf6

5.Nc3 a4 6.a3 Be6 7.d4 ed4 8.Na2?? (better is 8.Qd4 Qe7 9.Bc4+=) 8...Ne4 9.Bd4 Nf6 (9...c5 10.bc6 Nc6 11.Nb4–/+) 10.Be2 g6 11.Nf3 Bg7 12.0–0 0–0 13.c4 c6 14.Nc3 Qa5 15.Qc2 Nbd7 16.bc6 bc6 17.Ne4 Bf5 18.Bd3 d5 (18...Be4 19.Be4 Ne4 20.Qe4 Rfe8 21.Qc6 Bd4 22.Nd4 Ne5 23.Qd6 Red8–+) 19.Nf6+= Bf6 (better is 19...Nf6 20.Bf5 gf5 21.cd5 Qd5+=) 20.Bf6 (better is 20.Bf5 gf5 21.Qf5 Bd4 22.Nd4+/–) 20...Bd3=+ (< 20...Nf6 21.Bf5 gf5 22.Qf5+/–) 21.Qd3 Nf6 22.cd5 cd5 23.Qd4 Qa6 24.Qh4 h5 25.Rfe1 Rfe8 26.g4? Ng4–+ 27.Kh1 Qf6 28.Qg3 Re4 29.Kg2 Nh6 30.Re4? de4 31.Ng1 Qa1 (32.Qf4 Kg7 33.Qe4 Rd8–+) 0–1. Neffgen,Dieter – Rahn,Stefan, remoteschach.de, 2004.

5.Nc3 b6 6.Nf3 Be7 7.d4 ed4 8.Qd4 0–0 9.Rd1 h6 10.Bc4 Bg4 11.h3 Bf3 12.gf3 Nbd7 13.f4 Re8 14.Kf1 Nh5?? (better 14...a4+–) 15.Qd5+– g6 (15...Nf4 16.Qf7 Kh8+–) 16.Qf7 Kh8 17.Qg6 Ndf6 18.Nd5 Rg8 (18...Ng3 19.fg3 Bf8 20.Nf6 Qf6 21.Qg8) 19.Qh6 1–0. Silent Move (2115) – Greg Williams, redhotpawn.com (2), 2016.

5.Nc3 Nbd7 6.Nf3 Nc5 7.d4 Nce4 8.de5 Nc3 9.Bc3 =.

5.Nc3 Nbd7 6.Nf3 Be7 7.Bc4 =.

5.Nc3 Nbd7 6.Nf3 g6 7.d4+= ed4 8.Nd4 Bg7 9.Bd3 Nb6 10.Qc1 Nfd7 11.Nf3 0–0 12.0–0 Nc5 13.h3 (13.Re1 Re8=) 13...Re8 14.Re1 Be6 15.Ne2 Bb2 16.Qb2 Bc4 17.Nf4 Nba4 (worse is 17...Nd3 18.cd3 (worse is 18.Nd3 Na4 19.Qd4 Bb5+=) 18...Be6 19.Rac1+=) 18.Qc1 Nd3 19.cd3 Bb5 20.d4 Bc6 21.Qc2 Rc8 22.g3 (22.Rab1 Qf6 23.Nd5 Bd5 24.ed5 Re1 25.Ne1 Qd4+=) 22...Bd7–/+ 23.e5 Nb6 24.Rac1 Ba4 25.Qb1 Bc6 26.Nh2 Bd7 27.Ng4 Bg4 28.hg4 Qd7 29.g5 Re7 30.Qe4 c6 31.Qb1 de5 32.de5 Nd5 33.Rcd1 Rce8 34.Qb2 b5 35.a3 Rd8 36.Nd5 cd5 37.Rd4 Qe8 38.Qe2 a4 39.Rb4 d4 40.Qb5 Qb5 41.Rb5 d3 42.Rd1 d2 43.Kf1 Rd4 44.Ke2 Re4 45.Kf3 (45.Kd2?? Rd7 46.Kc3 Rd1–+) 45...R4e5 46.Re5 Re5 47.Rd2 Rg5 48.Rd8 Kg7 49.Ra8 h5 50.Ra4 Rc5 51.Ra7 Rc3 52.Kg2 g5 53.Ra8 Kg6 54.Rg8 Kf5 55.Rh8 (55.a4 Ra3 56.Ra8 Kg4=) 55...Ra3+= 56.Rh5 Kg6 57.g4 Ra4 58.f3 f5 59.Rh8 (59.Kh3!?+=) 59...fg4–/+ 60.Rc8 gf3 61.Kf3 Rf4 62.Kg3 Re4 63.Rg8 ½–½. Veiper,Andres (2300) – Taylor,Terry J (2335), ENG–EST, 2012.

5.Nc3 Nbd7 6.Nf3 g6 7.Be2 Nc5 8.d4 ed4 9.Qd4 Bg7 10.Nd5 (10.0–0 Be6 11.e5 Nfd7=+) 10...Nh5 (10...Nce4 11.Bd3 c5+–) 11.Qg7?? (better is 11.e5!?+=) 11...Ng7=+ 12.Bg7 c6?? (12...Rg8 13.Nf6 Ke7 14.Nd5 Ke6 15.Nd4 Kd7+=) 13.Bf6+/– (13.Bh8?! cd5 14.ed5 f6=) 13...Qf6? (13...cd5!? 14.Bd8 Kd8 15.ed5 Bf5+/–) 14.Nf6+– Ke7 15.0–0–0 Kf6 16.Rd6 Kg7 17.Nd2 cb5 18.Bb5 Be6 19.a3 Rhd8 20.Rb6 Rac8 21.Re1 Rd3 22.Nb1 Rd4 23.Nc3 Nb3 1–0. Hoch,Hubertus (2165) – Zylla,Johannes (2135), BdF, 2004.

5.Nc3 Be6 6.Nf3 Be7 7.d4 ed4 8.Nd4 0–0 9.Ne6 fe6 10.Bc4 Qd7 11.0–0 c6 12.Na4 Bd8 13.Bf6 Rf6 14.e5 de5 15.Nc5 Qd1 16.Rad1 Bb6 17.bc6 bc6 18.Ne6 Kh8 19.Ng5 Na6 20.Nf7 Rf7 21.Bf7 Bd4 22.Rc1 Rf8 23.Bc4 Nc7 24.Rb1 Nd5 25.Bd5 cd5 26.Rb5 Rd8 27.Ra5 Kg8 28.Rd1 Rc8 29.Rd2 Bc3 30.Rad5 Bd2 31.Rd2 Ra8 32.c4 Rc8 33.Rc2 Kf7 34.f3 Ke6 35.Kf2 g6 36.Ke3 Rc5 37.h4 h5 38.Kd3 Kf5 39.Kc3 g5 40.hg5 Kg5 41.Kb4 Rc8 42.c5 Kf4 43.c6 h4 44.c7 h3 45.gh3 Kf3 46.Kb5 e4 47.Kc6 e3 48.Kb7 Rc7 49.Rc7 e2 50.Re7 1–0. Badkarma – gadnoto, playchess.de, 2002.

5.Nc3 Be7 6.a4 0–0 (6...Nbd7 7.d4=) 7.Nf3 c6 8.d3 (8.Rb1 Be6=) 8...Bg4 (better 8...d5!? 9.ed5 cd5–/+) 9.Be2= Nbd7 10.h3 Bh5 11.0–0 d5 (11...Qc7 12.Nh4 Be2 13.Qe2=) 12.ed5 (12.ed5 cd5 13.Ne5 Ne5 14.Bh5+=) 1–0. sasikumar – blackfox, net–chess.com, 2019.

5.Nc3 Be7 6.Nf3+= a4 7.a3 (7.Be2 a3 8.Bc1 Nbd7+=) 7...0–0= 8.d4 ed4 9.Qd4 c6 10.Be2 (10.Bc4 cb5 11.Nb5 Nc6=) 10...cb5= 11.0–0 Nc6 12.Qe3 Ng4 13.Qd2 Bf6 14.Bb5 Ra5 15.Rab1 Nge5 16.Be2 (worse is 16.Ba4 Nf3 17.gf3 Bh3–+) 16...Nf3 17.Bf3 Ne5 (17...Bg5!? 18.Qd1 Be6=) 18.Be2+/– Be6 19.Rfd1 Nc4 20.Bc4 Bc4 21.Qd6 Qd6 22.Rd6 Rc8 23.Rb6 Ba6 24.Nd5 Bd8 25.Rd6 Rb5 26.h3 (26.Rd7 Kf8 27.Nb4 Bb6+/–) 26...Kf8+= 27.Nb4 Be7 28.Rd2 f6 29.Bd4 (worse is 29.Na6 ba6 30.c4 Rc4+=) 29...h5 30.c3 Ra5 31.g4 (31.Na6 ba6 32.Ra2 Rb5 33.Rb5 ab5+=) 31...Bc4+= 32.Kg2 Rb5 33.f4 Kf7 34.Re1 (34.gh5 Rh8+=) 34...Rd8 (34...g6 35.Kf3+=) 35.f5+= h4 (35...hg4 36.hg4 Rc5 37.g5+=) 36.Ra1 Bb3 37.Kf3 Bf8 (37...g5 38.fg6 Kg6 39.Re1+=) 38.Ke3 (38.Rf1 Be7+=) 38...Bd6 (38...Bc4 39.Kf2=) 39.Rf1+= Bc4 40.Rb1 Bb3 41.Rc1 Rc8 42.Rg1 Be7 (42...Bg3 43.Kf3+=) 43.Rgg2 Bd6 ½–½. manijer_wmp3 (2160) – cachisss (1910), gameknot.com, 2015.

5.Nc3 g6 6.d4 Nbd7 7.Nf3 ed4 8.Nd4 Bg7 9.g3 (9.Bd3 0–0+=) 9...0–0 10.Bg2 Re8 11.0–0 Nb6 12.Rb1 Ng4 13.a4 (13.Nd5 Nc4=) 13...Qg5 (13...Ne5 14.h3=) 14.h3 (14.Nd5 Na4 15.Nc7 Nb2 16.Rb2 Qh6+=) 14...Ne5 (14...Ne3 15.fe3 Qe3 16.Kh2 Qd4 17.Qf3=+) 15.Bc1 (15.f4 Qg3 16.fe5 Bh3=) 15...Qf6 16.Rb3 (16.Nd5 Nd5 17.ed5 Nc4=) 16...Ned7=+ 17.Nde2 Nc5 18.Ra3 Nc4 19.Ra2 Be6 20.Nd5 Bd5 21.ed5 Re7 22.h4 h6 23.Bd2 (23.Be3 Rae8–/+) 23...Nd2 24.Qd2 Rae8 25.Nf4 b6 26.c4 h5 27.Nh3 Qc3 28.Qc3=+ Bc3 29.Bf3 Ne4 30.Be4 Re4 31.Rc2 Bg7 32.Nf4 Rd4 33.Rb1 Ree4–/+ 34.f3 Rc4–+ 35.Rbc1 Rc2 36.Rc2 Ra4 37.Rc7 Rb4 38.Rc8 Bf8 39.Nh3 Kg7 40.Ng5 Be7 41.Ne4 f5 42.Nd2 Rb5 43.Rc7 Kf6 44.g4 Rd5 45.g5 Ke6 46.Nf1 a4 47.Ne3 Rc5 48.Ra7 Ra5 49.Rb7 a3 50.Rb6 a2 51.Nc2 Rc5 52.Nd4 Kd5 53.Nb3 Rc3 (54.Ra6 Rb3 55.Ra2 Rf3–+) 0–1. Bernstein,Sidney Norman – Mednis,Edmar John, USA–ch New York, 1959.

5.d3 Bg4 6.Be2 Bd7 7.a4 Be7 8.Nd2 0–0 9.Ngf3 c6 10.c4 cb5 11.cb5 b6 12.d4 ed4 13.Bd4 Bg4 14.e5 (better 14.0–0!?+=) 14...de5=+ 15.Be5 Nbd7 16.Bb2 Bc5 17.0–0 Re8 18.Bc4 Ne5 (18...Qc7=) 19.Bb3?? (better 19.Be5!? Re5 20.Bf7 Kf8 21.Bc4+–) 19...Nf3 (19...Nd3 20.Ba3–/+) 20.Nf3=+ Qc8 (20...Ne4 21.h3 Bh5 22.Qd5 Qd5 23.Bd5=) 21.Qd3 (21.Bf6!? gf6 22.Bd5+=) 21...Rd8= 22.Qc4 Bf3?? (better 22...Be6 23.Qc2 Bb3 24.Qb3 Qf5=) 23.Qf7+– Kh8 24.Bf6 (better 24.Qf6! Qg4 25.Qf3 Qf3 26.gf3+–) 24...Rd7?? (better 24...Qg4 25.Bg7! Qg7 26.Qf3 Rf8+–) 25.Bg7 1–0. alessandrocarvalhaes (1715) – Vishwajyoti (1745), lichess.org, 2019.

5.d3 g6 6.Be2 h5 7.Nd2 Bg7 8.Ngf3 a4 9.a3 h4 10.d4 ed4 11.Nd4 Nbd7 12.h3 Nc5 13.Bf3 0–0 14.0–0 Re8 15.Re1 Bd7 16.Rb1 Re7 17.b6 cb6 18.Nc4 Nce4 19.Be4 Ne4 20.f3 d5 21.Ne3 Nf6 22.f4 Rc8 23.f5 Qe8 24.Bc1 b5 25.fg6 fg6 26.Nf3 Bc6 27.Bd2 Rd8 28.Nh4 d4 29.Ng4 Re1 30.Be1 Qe4 31.Qd3 Ng4 32.hg4 Qg4 33.Qg6 Qg6 34.Ng6 d3 35.Rd1? (Better is 35.cd3 Rd3 36.Bb4–/+) 35...Bd4 36.Kh1 (36.Kf1 dc2 37.Rc1–+) 36...dc2 (37.Rc1 Be4–+) 0–1. Klement,Ottomar (1960) – Pachman,Ludek (2320), Jacques Lemans op, 1999.

5.d3 g6 6.g3 Bg7 7.Bg2 0–0 8.Nh3 Bd7 9.c4 Qc8 10.Ng5 h6 11.Nf3 Bg4 12.Nbd2 Nbd7 13.h3 Be6 14.Nf1 Nh7 (14...Nc5 15.Ne3+=) 15.Ne3+= f5 (better is 15...Nc5+=) 16.Nh4+/– f4 (16...fe4 17.Ng6 Re8 18.de4 Nc5+–) 17.Nd5 (better is 17.Ng6!? fe3 18.Ne7 Kh8 19.Nc8 Rf2 20.Bc1 Rg2 21.Ne7 Rg3 22.Qe2+–) 17...Bd5+/– 18.cd5 (18.Ng6!? Rf7 19.cd5 (19.ed5?! fg3 20.0–0 Qe8=) 19...fg3 20.fg3+=) 18...Qe8 19.g4 (19.0–0 Nc5=) 19...f3 (better is 19...Nc5!? 20.a4 Bf6+=) 20.Nf3+= Bf6 21.h4 Nc5 22.Bc1 (better is 22.a4+/–) 22...h5? (22...Qb5 23.0–0 Bg7 24.d4 ed4 25.Nd4=) 23.Bh3?? (better is 23.gh5 gh5 24.Rb1+–) 23...Qb5+= 24.gh5 Nd3 25.Kd2? (better is 25.Kf1 Nc1 26.Kg2+=) 25...Nf2–+ 26.Qg1?? (26.Qb3 Qb3 27.ab3 Nh1 28.hg6–+) 26...Qd3 27.Ke1 Qd1 28.Kf2 Bh4 29.Kg2 (29.Qg3 Rf3 30.Kg2 Qe2 31.Kg1 Rg3 32.Bg2 Rg2) 29...Qf3 (29...Qe2 30.Qf2 Qf2) 30.Kh2–+ Qe2 (30...Qh5?! 31.Bg4 Rf2 32.Qf2 Qg4 33.Qg2–/+) 31.Bg2 (31.Qg2 Rf2 32.Rg1–+) 31...Qh5 (31...Nf6 32.Qf1 Ng4 33.Kh3 Rf1 34.Rf1 Bf2 35.Re1 Be1 36.hg6 Ne3 37.Bf3 Qf3 38.Kh2 Qg2) 32.Qd1 Qd1 33.Rd1 Bg5 34.Bh3 Bf4 35.Kg2 (35.Bf4 Rf4 36.Rg1 Nf6 (36...Re4?! 37.Rg6 Kf7 38.Rag1 Re2 39.Kh1–+) 37.Rg6 Kf7–+) 35...Ng5 36.Re1 Nh3 37.Kh3 Rf7 38.Be3 b5 39.Rac1 b4 40.Bf4 ef4 (40...Rf4?! 41.Rc7 Raf8 42.Rd7 Rf3 43.Kg2 Rf2 44.Kg3 R8f3 45.Kg4 Rf4 46.Kg3 Ra2 47.Rd6 Ra3 48.Kg2 Rg4 49.Kh2–+) 41.e5 de5 42.Re5 Ra6 (42...f3 43.Kg3 f2 44.Rf1–+) 43.Kg4 (43.Kg2 a4–+) 43...f3 44.Re6 (44.Kg3 f2 45.Rf1 Raf6–+) 44...Rd6 45.Rd6 (45.Re8 Kg7 46.Re5–+) 45...cd6 46.Kg3 f2 47.Rf1 a4 48.Kg2 b3 49.ab3 ab3 50.Kg3 b2 51.Kg2 Kg7 52.Kg3 b1Q! 53.Rb1 (53.Rb1 f1Q Decoy) 53...f1Q 0–1. roy1nc6 (1830) – baitang (1965), gameknot.com, 2012.

5.Qf3 Be7 6.Qe3 0–0 7.Nf3 Nbd7 8.Bc4 Nb6 9.Bd3 Be6 10.c3 (10.Nc3 a4=+) 10...Na4 (10...Nc4 11.Bc4 Bc4 12.d3 Bb5 13.0–0–/+) 11.Bc1 Ng4 12.Qe2 b6 (better 12...Nb6!?=+) 13.Bc2+= Nc5 14.h3 Nf6 15.d4 ed4 16.cd4 Nb7 17.0–0 Qc8 18.g4 (better 18.d5!? Bd7 19.Nc3+–) 18...Bg4 19.Qe3?? (better 19.hg4 Qg4 20.Kh2 Qh5 21.Kg2 Qg4 22.Kh1 Qh5 23.Kg1 Qg4 24.Kh2 Qh5 25.Kg3 Qg4 26.Kh2=) 19...Bh3–+ 20.Ng5 (20.Nh4 Qg4 21.Qg3 Bf1 22.Kf1 Qg3 23.fg3 g6–+) 20...Bf1 21.Kf1 Qg4 (21...h6 22.Nf3–+) 22.e5 de5 23.de5 Nd5 (better 23...Rfe8–+) 24.Qd2?? (24.Qe4 Qe4 25.Be4–+) 24...Bg5 25.Qe2 (25.Qd3 Rfd8 26.Qh7 Kf8 27.Ba3 Nc5 28.Bc5 bc5 29.Qe4–+) 25...Qe2 (25...Bc1?! 26.Qg4 Bb2 27.Qe4–+) 26.Ke2 Bc1 27.f4 Bb2 28.Nc3 Ba1 (better 28...Nc3 29.Kf3 Ba1 30.Ke3–+) 29.Nd1 Nf4 30.Kf3 Be5 31.Nf2 Nd6 32.Ng4 Ng6 33.Bg6 fg6 34.Ke3 Bf4 35.Kd4 Nb5 36.Kd5 Nc3 (36...Rf5 37.Ke4 Re8 38.Ne5 Ree5 39.Kd3 Re3 40.Kc2 Na3 41.Kc1 Rc5 42.Kd1 Rd5 43.Kc1 Re2) 37.Kc4–+ Na2 38.Nf2 Rae8 39.Nd3 b5! 40.Kb5 (40.Kc5 Rf5 41.Kc6 Re6 42.Kd7 Rd6 43.Kc8 Rf8 44.Kb7 Rb6 45.Ka7 b4 46.Nf4 Nc3 47.Ng6 Nb5) 40...Rb8 (40...Rf5 41.Ne5 Rfe5 42.Kc4 Re4 43.Kc5 R8e6 44.Kb5 Nc3 45.Ka5 Ra4) 41.Kc6 Rb6 (41...Nb4 42.Kc5 Nd3 43.Kd4 Rfd8 44.Kc3 c6 45.Kc4 Nb2 46.Kc5 Na4 47.Kc6 Rb6) 42.Kd5 Rf5 (42...Rd8 43.Ke4 Nc3 44.Kf4 Rd3 45.Kg5 Rb5 46.Kg4 Rb4 47.Kg5 Rd5) 43.Ke4–+ Re6 44.Kd4 Be3 (44...a4 45.Nf4 Rf4 46.Kd3 Nb4 47.Kc3 c5 48.Kd2 Rf2 49.Kd1 a3 50.Kc1 Re1) 45.Kc4 Rc6 46.Kb3 Rc3 47.Ka2 (47.Kb2 Rd3 48.Kc2 Nb4 49.Kb1 Rf1 50.Kb2 Bd4) 47...Rf2! 48.Nb2 (48.Nf2 Rc2 Double attack (48...Rc2 Decoy)) 48...a4 49.Kb1 (49.Ka1 Rc1 50.Ka2 c5 51.Ka3 Ra1) 49...Rb3 (49...Rc1 50.Ka2 c5 51.Ka3 Ra1) 50.Ka1 (50.Ka2 Rbb2 51.Ka3 Bc5 52.Ka4 c6 53.Ka5 Ra2) 50…Rbb2 (50...Bd4 51.Kb1 Rbb2 52.Kc1 Rf1) ½–½. alessandrocarvalhaes (1855) – enmanuel305 (1975), lichess.org, 2019.

4.Nf3 b6

5.a4 Bb7 6.e3 f6 7.Be2 (7.d4+=) 7...e4 (7...d5 8.d4 e4 9.Nfd2+=) 8.Nh4 (8.Nd4+/–) 8...f5? (better is 8...Nd7+=) 9.Bh5+– g6?? (better is 9...Kd7 10.Nf5 Nf6+–) 10.Be2 (better is 10.Ng6 hg6 11.Bg6 (11.Bh8?! Qg5+/–) 11...Ke7 12.Bh8+–) 10...Qh4?? (better is 10...Nf6=) 11.Bh8+– Nf6?? (11...Nd7 12.Nc3+–) 12.0–0 (better is 12.g3 Qh3 13.Bf1+–) 12...Nbd7 13.d4 (13.f3 d5+/–) 13...Qh6 14.c4+– 0–0–0 15.c5 dc5= 16.dc5 Nc5–/+ 17.Qc2?? Nd5?? 18.Nc3?? Nb4–+ 19.Qb2 Bg7?? 20.Bg7+= Qg7 21.Rad1 Ncd3 22.Bd3 Rd3 23.Rd3+/– Nd3 24.Qa2 Qd7?? 25.Ne2 Bd5 26.Qa1 Qd8 27.Nd4 Qd6 28.h3 (28...Kb7 29.Ne2+=; 28.Qd1 h5+/–) 1–0. stoker – boggey, Caissa's Web, 2004.

5.e4 Bb7 6.d3 g6 7.Be2 Bg7 8.0–0 Nd7 9.c4 Ngf6 10.Nc3 0–0 11.Nd5 Bd5 12.cd5 Nc5 13.Ba3 Nfd7 14.Qc2 f5 15.Nd2 Bh6 16.Nc4 fe4 17.de4 Qh4 18.g3 (better is 18.Bd3!?=) 18...Qe4+= 19.Qe4 Ne4 20.Bg4 Ndc5 21.Bc1? (better is 21.f3 Nc3 22.Bc5 bc5 23.Be6 Kg7 24.a4–/+) 21...Bc1–+ 22.Rac1 h5 (22...Nf2 23.Ne3 Nfd3 24.Rf8 Kf8 25.Rc4–+) 23.Bh3? (23.Be2 a4–/+) 23...Ng5 (better is 23...Nf2!? 24.Be6 Kg7–+) 24.Bg2–/+ Nf3 25.Bf3 Rf3 26.Kg2 Raf8 27.Nd2 Rd3 28.Rcd1 Rd5 29.Nf3 Rd1 30.Rd1 Kg7 31.h4 Ne6 32.Rc1 Rf7 33.a4 Nc5 34.Rc4 d5 Black intends e4 35.Rc1 e4 36.Ng5 Rd7 37.Ra1 d4 38.Kf1 d3 39.Rd1 Rd4 40.Ke1 Ra4 41.Kd2 Ra2 42.Ke3 Re2 43.Kd4 Nb3 44.Kc3 Nc5 45.Rd2?? a4 46.Re2 de2 47.Kd2 a3 48.Ne4 Ne4 49.Ke2 a2 50.Ke3 Nd6 51.f4 Nb5 52.g4 a1Q 53.g5 Qc3 54.Ke4 (54.Ke4 Nd6 55.Kd5 Qc4 56.Ke5 Qe4; 54.Kf2 Nd4 55.Kg2 Qf3 56.Kh2 Qf2 57.Kh3 Nf3 58.f5 Qh2). bratek55 (1715) – ketorab, kurnik, 2011.

4.Nf3 c6

5.a4 Bd7 6.e4 d5 (better is 6...Nf6!? 7.Nc3 Be7+=) 7.Ne5 de4 8.Nd7 Qd7 9.Bc4 Bd6?? (9...cb5 10.Bb5 Nc6 11.Qe2+/–) 10.0–0 (better is 10.Bg7 Be5 11.Be5+–) 10...Nf6 11.d3 ed3 12.Qd3 0–0 13.Bf6 gf6 14.Nd2 Kh8 15.Ne4 Be5 16.Qd7 Nd7 17.Rad1 Rad8 18.f4 Bc3?? (better is 18...Nb6 19.fe5 Nc4+/–) 19.Nc3+– 1–0. bratek55 (1670) – j1a9n55, kurnik, 2011.

5.e3 Bd7 6.a4 Nf6 7.c4 (7.bc6 bc6 8.Nc3 e4=) 7...Be7 8.Be2 0–0 9.0–0 e4 10.Nd4 d5 11.Nb3 (11.cd5 c5 12.Nb3 Bf5=) 11...b6 (11...dc4 12.Bc4 cb5 13.ab5=) 12.cd5 cd5 (12...cb5 13.ab5 Nd5 14.d3=) 13.d3+= Be6 14.Nd4 Qc7 (14...Qd6 15.Nc3=) 15.Ne6 (15.de4 Ne4 16.Bd3 Qe5+=) 15...fe6= 16.de4 Ne4 17.Nd2 Nd6 (17...Nc3 18.Bc3 Qc3 19.Rc1=) 18.Qc1 (18.Rc1 Qb7+=) 18...Qd8 19.Ba3 (19.Bd3 Nd7+=) 19...Nd7 20.Qb2 (20.Bg4 Rf6=) 20...Bf6 21.Qc2 (21.Qa2 Ba1 22.Bd6 Be5 23.Bf8 Qf8=) 21...Rc8=+ 22.Qd3? (22.Qd1 Ba1 23.Bd6 Bc3 24.Bf8 Qf8=+) 22...Ne5 23.Qb1=+ Rf7 24.Bd6 Qd6 25.Ra2 Rc3 26.Rc2 Rfc7 27.Rc3 Rc3 28.Rc1 Qc5 29.Rc3 Qc3 30.Nb3 Nc4 31.g3 Qb4 32.Qa2 Nb2–+ 33.Kg2 Na4 34.Nd4? Bd4 35.ed4 Qd4 36.Qc2 Qe4 37.f3?? Qc2 38.f4 Qe2 (39.Kh3 d4 40.g4 d3 41.f5 d2 42.f6 d1Q 43.f7 Kf7 44.Kg3 Qg4 45.Kf2 Qgf3#) 0–1. guest508 – guest257_jjirous, ICC, 1999.

5.e3 Nf6 6.d4 e4 7.Nfd2 d5 8.Be2 Be7 9.a3 a4 10.c4 Be6 11.Nc3 dc4 12.bc6 Nc6 13.Nde4 Ne4 14.Ne4 0–0 15.0–0 b5 16.Bf3 Bd5 17.Nc3 Bf3 18.Qf3 Na7 19.Rad1 Qa5 20.Nd5 Bd6 21.e4 b4? 22.ab4 Bb4+/– 23.Nb4 Qb4 24.Ba3 Qb3 25.Bf8 Rf8? 26.Rb1 Qa2? 27.Ra1 Qc2 28.Rfc1 Qb2 29.d5 Rc8 30.Qc3 Qb3?? 31.e5 Nb5?? 32.Qa5 Nd4 33.Rcb1 Qc2 34.d6 Nb3?? 35.d7 Rf8 36.d8Q Na5 37.Qa5 g6 38.Qa4 Qd3 39.Rc1 Rc8 40.Qc2 Qd4 41.Qc3 Qd5 42.Ra4 Qe4 43.Rc4 Rc4 44.Qc4 Qe5 45.g3 1–0. ferminkatcho (1775) – igazp (1680), kurnik, 2012.

5.e4 Nf6 6.Nc3 Be7 =.

4.Nf3 Bd7

5.a4 c5 6.e3 (6.e4 Be6+=) 6...Nf6 7.Bc4 (7.d3 Be7=) 7...b6 (7...e4!? 8.Ng5 d5 9.Bd5 Nd5 10.Nf7 Kf7 11.Qh5 Ke7 12.Qd5 Qb6=) 8.0–0 (8.Nc3 Bg4+=) 8...d5= 9.Ba2 Bg4 (9...e4!? 10.Ne1 Be6=) 10.h3 Bf3 11.Qf3 (worse 11.gf3 Qd7=+) 11...e4 (11...Qd6 12.c4+–) 12.Qf5 (12.Bf6 ef3 13.Bd8 fg2 14.Kg2 Kd8 15.d4+–) 12...Be7? (12...Qd7 13.Qg5 h6 14.Qe5 Qe6 15.Qc7+=) 13.Nc3 (13.Bf6!? Bf6 14.Bd5 Ra7+–) 13...g6 (13...c4 14.f3 ef3 15.Qf3+–) 14.Qg5 (14.Qe5 Nbd7 15.Qg3 0–0 16.Nd5 Rc8+–) 14...h6 15.Qg3 (better 15.Qe5 Nbd7 16.Qg3+–) 15...Qd6?? (better 15...Rh7+–) 16.Qd6 Bd6 17.Nd5 Nbd7 18.Nf6 (18.Nf6 Nf6 19.Bf6+–) 1–0. Dino_Jarach (1845) – Bambarmija (1865), lichess.org, 2020.

5.a4 g6 6.e3 Bg7 7.Be2 Nf6 8.d3 0–0 9.e4 c6 10.Nbd2 (10.Ba3!? Re8 11.Bd6=) 10...cb5=+ 11.ab5 Bb5 12.Ba3 Nc6 13.Rb1 Ba6 14.0–0 Re8 15.c4 Rb8 16.Qa4 Qd7 17.Nb3?? (better 17.Rfe1=+) 17...Ne7 (better 17...b5 18.Nc5 dc5 19.cb5 Nb4 20.Bb4 cb4 (20...ab4?! 21.Qa6 Qb5 22.Qa2–/+) 21.Qa5 Qb5 22.Qb5 Rb5–+) 18.Qd7+= Nd7 19.Na5 Exerts pressure on the backward pawn 19...b5? (19...Nc8!?+=) 20.cb5 (20.Bd6!? bc4 21.Bb8 cd3+–) 20...Rb5+– 21.Rb5 Bb5 22.Bd6 Nc8 23.Bb4 Ndb6 (23...Bf8 24.Rb1 Bb4 25.Rb4+–) 24.Bd2 Nd6 25.Nb3 (25.Rb1 Na4 26.Kf1 Nc5+–) 25...Ra8 (better 25...Ne4!? 26.Rb1 Nd7=) 26.Nc5+– Ra3 The backward pawn on d3 becomes a target 27.Rd1 Bd3?? (better 27...Ra2+=) 28.Nd3 (better 28.Bd3 Ndc4 29.Bb4+–) 28...Rd3 (28...Ne4 29.Nde5 Ra2+–) 29.Bd3 Nbc4 (29...f5 30.ef5 e4 31.Bb4 ed3 32.Bd6+–) 30.Bc3 (30.Bc3 f6 31.Be2+–) 1–0. alessandrocarvalhaes (1880) – nanasama (1900), lichess.org, 2019.

4.Nf3 f5

5.c4 Nf6 6.e3 Nbd7 7.d4 e4 8.Nfd2 c5 (8...Be7 9.Be2=) 9.Nc3 Be7 10.a4 (10.Be2 0–0=) 10...cd4 11.ed4 0–0 12.Qb3 Kh8 (12...Rb8 13.Be2+=) 13.Ne2 (13.Be2 Qe8=) 13...d5 (13...Re8 14.Ng3=) 14.c5 (14.Nf4!? Nb8 15.cd5+/–) 14...Bc5 15.Nf4 (15.dc5?? Nc5 16.Qg3 Nd3 17.Kd1 Nb2 18.Kc2 Nd3–+) 15...Re8? (better is 15...Bb4 16.Ne6 Qb6 17.Nf8 Nf8=) 16.dc5+/– Nc5 17.Qe3?? (better is 17.Qa3 b6 18.Bd4+–) 17...Nd3!–/+ 18.Bd3 ed3 Discovered attack. 19.Be5 Ng4 20.Qg3 Re5 21.Kd1 Qf6 22.Rc1? Re8–+ 23.h3 Qd4 The mate threat is Qxa4 24.hg4 Qa4 25.Nb3 Qb3 26.Kd2 Qb4 27.Kd3 fg4 28.Ng6 Kg8 29.Qf4 Qb5 30.Kc3 Qb4! 31.Qb4 ab4 32.Kb4 hg6 33.Rc7 Bf5 34.Rd1 Rad8 35.Rb7 d4 36.Rc7 d3 37.Ra1 Rb8 38.Kc3 Rbc8 39.Raa7 Rc7 40.Rc7 0–1. Palmin,A – Blackstone,J, San Francisco CA, 1964.

5.e3 Be6 6.c4 Be7 7.Be2 Nd7 8.0–0 Nh6 9.d3 0–0 10.Nc3 Kh8 11.Qc2 g5 12.Rfd1 g4 13.Ne1 Bf6 14.g3 (14.d4!?+=) 14...Bg7 15.Ng2 Nf7 16.Nd5 (16.f4 Qe7=) 16...Ng5 17.Nh4 (17.Rf1!?+=) 17...Nh3–/+ 18.Kf1 c6 19.bc6 bc6 20.Nc3 f4 21.ef4 ef4 22.Re1?? (better is 22.f3!?–/+) 22...Ne5 23.Ne4 Rb8 24.Bc3?? fg3–+ 25.hg3 d5 26.Be5 Be5 27.cd5 Bd5 28.Bg4 Ba1 29.Bh3 Bg7 30.f4 Rf4! 31.gf4 Qh4 32.Qg2 Qf4 33.Qf2 Qh6 34.Kg2?? Rg8 35.Kh2 Be5 36.Ng3 Bg3 37.Qg3 Rg3 38.Kg3 Qg5 39.Bg4 Kg7 40.Re2 h5 41.Re7 Qe7 42.Bh5 Qg5 43.Bg4 Be6 44.Kf3–+ Qg4 45.Ke3 Qg5 46.Kd4 Qd5 47.Kc3 Qc5 48.Kd2–+ Ba2 49.Ke2 Qd4 50.Kd2 Bb1 51.Ke2 Bd3 52.Kf3 Qe4 53.Kg3 ½–½. bratek55 (1665) – heetman (1650), kurnik, 2011.

5.e3 Nf6 6.a4 Be6 7.c4 Be7 8.Be2 0–0 9.0–0 Kh8 10.d3 Nbd7 11.Nbd2 Qe8 12.Nb3 b6 13.Rc1 Qg6 14.Kh1 Qh6 15.h3 Rg8 16.Nh2 Raf8 17.Rg1 g5 18.f3 (18.Qc2 g4+=) 18...g4–/+ 19.fg4 fg4 (19...Qe3 20.gf5 Bf5 21.Rf1–/+) 20.d4?? (better is 20.Qd2–/+) 20...e4 (better is 20...Ne4 21.Ng4 Bg4 22.Bg4 Nf2 23.Kh2 Ng4 24.Qg4 Rg4 25.de5 de5–+) 21.d5+= gh3 (better is 21...g3!? 22.de6 gh2 23.Kh2 Ne5+=) 22.de6+/– hg2 23.Rg2 Rg2 24.Kg2 Ne5 25.Be5 de5 26.Kh1 Qe3 27.Qd2?? Qh3?? 28.Rg1?? e3?? 29.Qe1 Ne4+= 30.Rf1?? Nf2 31.Rf2 ef2 32.Qf1 Qe6 33.Nd2 Bh4 34.Ndf3 Bg3 35.Qg2 Rg8 36.Qf1 e4 (36...e4 37.Qa1 Be5 38.Ne5 Rg1 39.Qg1 fg1Q 40.Kg1 Qe5–+) 0–1. bratek55 (1605) – balten (1650), kurnik, 2011.

5.e3 Nf6 6.Bc4 d5!? 7.Be2 e4 =.

5.e3 Nf6 6.Bc4 g6 7.a4 (7.Nc3 Nbd7+=) 7...Bg7 (7...d5 8.Bb3 e4 9.Ng5+/–) 8.d3 (8.Nc3!?+/–) 8...Qe7+= 9.Nbd2 Nbd7 10.0–0 Nf8 (10...Nb6 11.Bb3+=) 11.Bb3 (better is 11.Re1!?+/–) 11...Ne6= 12.b6 c6 13.Nc4 (13.Ba3 c5 14.e4 fe4 15.de4 0–0+=) 13...0–0= 14.Qd2 ½–½. Althoff,Guntram (2115) – Rasch,Holger (2255), Hessen–ch MVT, 2005.

5.e3 Nf6 6.d4 e4= 7.Nfd2 Be7 8.c4 Nbd7 9.Nc3 Nf8 10.Be2 Ng6 11.Qc2 (11.h4 h5+=) 11...0–0 12.a4 c6 13.h4 (13.0–0=) 13...d5 (better is 13...h5!?=) 14.h5+/– Nh8 15.f3 (better is 15.h6!?+/–) 15...Nf7 16.0–0–0 (16.0–0 ef3 17.Bf3 Be6=) 16...cb5 (16...Be6 17.Kb1–/+) 17.ab5 dc4 (17...Be6 18.Kb1+=) 18.Bc4= a4 (18...ef3 19.gf3 Kh8=) 19.Ba1 (better is 19.Na4!? Kh8 20.fe4 fe4 21.Rdf1+=) 19...Bd7 (19...a3 20.h6 g6 21.Qb3+=) 20.g4 (20.h6 g6+=) 20...fg4 (20...ef3 21.g5 Ng4=) 21.fe4= Qc8 1–0. Azis Azizis,Ektoras (2215) – Kordis,Konstantinos (2200), Porto Rio GRE, 2014. (=1.Nf3 d6 2.b4 a5 3.b5 e5 4.Bb2 f5)

5.e3 Nf6 6.Be2!? +=.

4.Nf3 Nf6

5.Nc3 Bf5 =.

5.c4 Nbd7 6.e3 (6.d4 e4 7.Nfd2 Be7=) 6...e4=+ 7.Nd4 Ne5 8.a4 (8.Nc3 Bg4 9.Qc2 d5+=) 8...Bg4 (8...d5 9.cd5 Nd5 10.Qc2 Nd3 11.Bd3–/+) 9.Qc2 c5 10.Nb3 b6 11.Nc1 Be7=+ 12.h3 Be6 13.Be2 0–0 14.0–0 Qc7 15.Na3 d5 16.cd5 Bd5 17.d4 Ng6 18.Nb3 Rad8 19.Rac1 Nd7 20.Nd2 Qb7= 21.dc5 Nc5 22.Rfd1 Nd3 23.Bd3 ed3 24.Qc7 Bg2–/+ 25.Rc3 Qc7–+ 26.Rc7 Bh3 27.Rdc1 Bd6 28.R7c6 Bc5 29.Nac4 Ne7 30.Rc7 Nd5 31.Rb7 Rfe8 32.e4 Nf4 33.Rd1 Rd7 34.Rd7 Bd7 35.Kf1 h6 36.Be5 g5 37.Bc7 Bh3 38.Kg1 Ne2 39.Kh2 Nc3 40.Rc1 Ne2?? 41.Rb1?? Be6 42.Bb6 Nc3 43.Re1? Bc4 44.Bc5 Na4 45.Nc4 Nc5 46.b6 Re4+/– 47.Re4 a4 48.Rd4 a3 49.Na3 g4 50.Rd3! Nd3 51.b7 Kg7 (51...Kh7 52.Kg1 h5 53.b8Q+–) 1–0. NN – ChessMaster2000, 1994.

5.c4 Be6 6.d4 ed4 7.Nbd2 =.

5.d4 e4=+ 6.Nfd2 Bf5 7.e3 Be7 (7...d5 8.Be2=+) 8.c4 (8.Be2 0–0=+) 8...Nbd7 (8...a4 9.a3=) 9.g3 0–0 10.Bg2 Bg4 11.Qc2+= d5 12.c5 b6 13.c6= Nb8 14.a4 Bb4=+ 15.0–0 Be2 16.Re1 Bd3 17.Qc1 Bc4 18.Nc3 Bd3 19.Bh3 Bd6 20.Ne2 h6 21.Kg2 Bb4 22.Nf4 Bd2 23.Qd2 Bc4 24.Rac1 Qe7 25.Bc3?? Qa3?? 26.Ra1= Qd6 27.Reb1 Ra7?? 28.Qb2 Ra8 29.Be1 Ra7 30.Rc1 Ra8 31.Kg1 Ra7 32.Rc4 dc4–/+ 33.Bf1 g5 34.Ng2 Nc6 35.bc6+/– Qc6 36.Qc3 Qd6 37.Bc4+/– Nd5 38.Qb3 Rd8 39.h4 gh4+= 40.Nh4 Qd7 41.Kg2 f5 42.Bc3+/– Kh7 43.Bb2 Rb7 44.Rh1 c5 45.dc5 bc5 46.Bb5 Qe6 47.Kg1 Rb6 48.Ba1 Rbd6 49.Ng2 Qe7 50.Qb2 Nc7 51.Bc4+/– Rd1 52.Bf1 Nd5 53.Nh4 Qd7 54.Nf5 Rf1 55.Kf1 Kg6 56.Nh6 Nc7?? 57.Qf6 Kh7 58.Nf7 Qh3 59.Rh3 Kg8 60.Rh8# 1–0. NN – ChessMaster2000, 1994.

5.g3 c6 6.Nc3 =+.

5.g3 Bg4 6.Bg2 Qc8 7.h3 Be6 8.d3 h6 1–0. Serebrysky – Savchenko, corr, 1988.

5.g3 g6 6.Bg2= Bg7 7.0–0 0–0 8.d4 ed4 9.Nd4 Nbd7 10.c4 Nc5 11.Nc3 Ng4 12.Nd5 Re8 13.h3 Ne5 14.Qc2 f5 15.Rad1+= Kh8 16.Nf3 Nf3 17.Bf3 Kg8 18.b6 cb6 19.Bg7 Kg7 20.Qb2 Kh6 21.Nb6 Ra6 22.Nc8 Qc8 23.Rb1 Qc7 24.Rfd1 Ne4 25.Qb7 Qb7 26.Rb7 Nc3 27.Rd2 Rc8 28.Rb3 Ne4 29.Be4 fe4 30.Rd4 a4 31.Re3+– Rb8 32.Ree4 Rb2 33.Re6 a3 34.Re7 g5 35.Rde4+/– d5 36.cd5 Ra2 37.R7e6 (37...Re6 38.Re6 (38.de6?! Rd2 39.e7 a2+–) 38...Kg7 39.e4+/–) 1–0. Harabor,M – Nelson,Brian, corr, 1991.

5.d4 ed4

6.Qd4 Be7 7.Nc3 Bg4 8.Qf4 (8.0–0–0 0–0=) 8...0–0 9.e4 a4 10.a3 (10.0–0–0 c6=) 10...Nbd7 11.h3 (11.0–0–0 Ne5 12.Kb1 Nh5=+) 11...Bh5 12.Bc4 Nb6 13.Ba2 Qd7 14.0–0 Bg6 15.Rad1 Qe8 16.Rd4 Nh5= 17.Qd2 Bf6 18.Rb4 Bc3 19.Qc3 Be4 20.Re1 d5 21.Qc7 Nc4?? 22.Bc4+– dc4 23.Qc4 Rc8 24.Qe4 Qe4 25.Ree4 Rc2 26.Re7 b6 27.Bd4 Nf4 28.Ra4 Nd5 29.Rd7 Nc7 30.Rb4 Na8 31.Be5 f6 32.Bd6 Re8 33.Rg4 g6 34.Rh4 h5 35.Rf4 f5 36.Ne5 Rb2 37.Ng6 Rb1 38.Kh2 Rb5 39.Rh4 f4 40.Rf4 Rg5 41.Ne7 Kh7 42.Nd5 Rg7 43.Nf6 Kh6 44.Rg7 Rd8 45.Rh7 Kg6 46.Bb4 b5 47.Rh5 Rb8 48.Re5 Rb7 49.Nd5 Kg7 50.Rg5 Kh6 51.Rg8 Rg7 52.Rh4 Kg6 53.Rg4 Kf5 54.R4g7 Ke6 55.Rd8 Ke5 56.Re7 Kf5 57.g4 Kg6 58.Rg8 Kh6 59.Bd2# 1–0. GrandMasterChess – SuperForte, 1994.

6.Qd4 Bf5 7.Qd1 =+.

6.Bd4 Be7 =.

6.Bd4= Bf5 7.e3 Nbd7 (7...d5 8.Bd3 Bb4 9.c3 Bd3 10.Qd3+=) 8.Bd3+= Bd3 9.Qd3 d5 10.0–0 Bd6 (10...Bb4 11.Rd1+=) 11.c4 (11.Nc3 c6+=) 11...dc4 12.Qc4 0–0 13.Nbd2 Re8 14.Rfd1+= a4 15.Ng5 Re7 16.Bf6 Nf6 17.Nde4 Ne8 18.Nc5+/– Qc8 19.Na4 Nf6 20.Nc5 Qf5= 21.Nf7 Rf7 22.Nb7 Ne4 23.f3 Rb8 24.Nd6 Nd6–/+ 25.Qh4 Qb5 26.a4 Qe5 27.e4 c5 28.Ra2 c4 29.Rad2 Qc5 30.Kh1 Ne8 31.Rd8 Qe5 32.Rb8 Qb8 33.a5 Nf6 4.Qe1 Rd7 35.Rd7=+ Nd7 36.h3 Nc5 37.Qd2 Qe5 38.Qa2 Nb3 39.a6= Qb8 40.a7 Qa8 41.Qa6 Kh8? 42.Qc4+– Na5 43.Qd5 Nc6 44.f4 Qe8 45.Qf7?? Qa8= 46.Qd5 Qc8?? 47.Qf7 Qa8 48.Qd5 ½–½. SuperForte – GrandMasterChess, 1994.

4.g3 Nd7

5.Bg2 Rb8 6.a4 Ngf6 7.e4 Nb6 8.Ne2 Be6 9.0–0 Be7 10.d3 0–0 11.Kh1 Nfd7 12.Nd2 f6 13.f4 d5 14.f5 Bf7 15.Ng1 (15.Bc3!?=) 15...d4 16.Ndf3 (16.c3!? Nc5 17.cd4 Nd3 18.Bc3=+) 16...Nc5 17.g4? (better 17.Ba3!?–/+) 17...Nba4 18.Ba3 b6 (18...Nc3 19.Qe1–+) 19.Bc5 (19.Ne2 Be8–/+) 19...Nc5 20.h4 White prepares g5 (20.Ne2 Qd7–+) 20...Kh8 21.Nh3 White intends g5 21...Rg8 22.g5 Bh5 (22...Qd7 23.Kg1–+) 23.Qd2 (23.Ne5!? Be8 24.Nc6 Bc6 25.bc6 fg5 26.e5 gh4 27.Qg4=+) 23...Nd7 24.Rg1 Nf8 (24...Bb4 25.Qe2 Bc3 26.Raf1–+) 25.Nh2 (25.gf6 gf6 26.Qh6 Be8–+) 25...Qe8 26.c3 c5 (better 26...dc3!? 27.Qc3 Bc5 28.gf6 gf6–+) 27.c4–/+ Qf7 28.gf6 Bf6 29.Ng5 Qe7 30.Ra2 h6 31.Bf3 Be8 (31...hg5?! 32.hg5 Nh7 33.Bh5 Bg5 34.Qg2=+) 32.Nh3 Bh4 33.Bd1 Nh7 34.Nf3 Bf6 35.Qg2 Rb7 36.Nh2 Ng5 37.Ng5 Bg5 38.Nf3 (38.Qh3 Be3 39.Rgg2 Rf8–+) 38...Be3 39.Rf1 Bh5 (39...g6!? 40.Qh3–+) 40.Qh3 (better 40.Ne5!? Qe5 41.Bh5–/+) 40...Bf3–+ 41.Bf3 Qg5 42.Bh5 Qf6 43.Bg6 Ra7 44.Rf3 a4 45.Rh2 a3 46.Re3?? (46.Ra2–+) 46...Qg5 (better 46...de3 47.Ra2 e2–+) 47.Re1+– a2 48.Ra1 Qc1?? (better 48...Rga8+–) 49.Rc1+– Rf8 (49...a1Q 50.Ra1 Ra1 51.Kg2 Ra2 52.Kf3 Ra3+–) 50.Ra1 (50.f6 Rc7 51.fg7 Kg7 52.Qh6 Kf6 53.Qf8 Rf7 54.Qf7 Kg5 55.Rg1) 50...Kg8 51.Rha2 Ra2 (51...Rd7 52.Ra8 Rdd8 53.f6 Ra8 54.Qe6 Kh8 55.Ra8 Ra8 56.fg7 Kg7 57.Qf7 Kh8 58.Qh7) 52.Ra2 Rb8 (52...Rd8 53.f6! Rf8 54.Qd7 Rf6 55.Ra8 Rf8 56.Rf8 Kf8 57.Qf7) 53.f6! Kf8 (53...gf6 54.Qe6) 54.Qd7 Kg8 (54...gf6 55.Qf7) 55.Qg7 1–0. bolu – workchess, net–chess.com, 2020.

5.Bg2 Ngf6 6.c4 g6 7.Nf3 Bg7 8.0–0 0–0 (8...Nb6 9.d3 e4 10.Nfd2 ed3 11.ed3 0–0 12.Re1) 9.d4!? e4 10.Nfd2 Re8 (10...e3!? 11.fe3 Ng4 12.Rf3 Bh6unclear) 11.e3 (11.Nc3!?) 11...Nf8 (11...c6 12.Nc3) 12.Qc2 Bf5 13.Nc3 Qe7 14.Nd5!? Nd5 15.cd5 h5 (15...a4 16.Rac1 a3 17.Ba1 Ra5 18.Qc7 Rb5 19.Qe7 Re7 20.Nc4 Rd5 21.Bc3!) 16.Rac1 Rac8 17.b6!? cb6 18.Qb3 (withdraw) 1–0. Gross – Kukula, corr private 1997–98 (Gross).

4.g3 Nf6

5.Bg2 c6 6.c4+= Be6 7.d3 Qb6 (7...cb5 8.Bb7 Ra7 9.Bg2 bc4 10.dc4+=) 8.Nc3 d5 (8...Nbd7 9.bc6 bc6 10.Rb1=) 9.Na4 Qc7 10.b6 Qd8 (10...Bb4 11.Kf1 Qe7 12.cd5 Bd5 13.e4=) 11.Be5 dc4 12.dc4 Bb4 (12...Qd1 13.Rd1 Bc4 14.Bf6 gf6 15.Ra1+=) 13.Kf1 Qd1 (worse is 13...Bc4 14.Qd8 Kd8 15.a3+=) 14.Rd1 Bc4 15.Ra1 (15.Bf6 gf6 16.Ra1 Bb5+=) 15...Nbd7 16.Bd4 0–0 17.Nb2 (17.h4 Rad8+=) 17...Bd5 (17...Be6 18.Bf6 Nf6 19.Na4–/+) 18.f3 (18.a3 Be7–/+) 18...c5–/+ 19.Bf6 Nf6 20.e4 Bc3 21.ed5 Bb2 22.Rb1 Bd4 23.f4 Rfd8 24.Ne2 Nd5 25.Nd4 cd4 26.Bd5 Rd5 27.Ke2 Re8 28.Kd2 Kf8 29.Rhc1 d3 30.Re1+= Re1 31.Re1 Rb5 32.Kd3 Rb6 33.Re2 Rb4 34.h4 b5 35.h5 Ra4 36.Rb2 b4 37.g4 f5 38.g5 Ra3 39.Kd4 Ke7 40.Kd5 Re3 41.Rc2 Kd7 42.Rc5 Ra3 43.Rc2 Rc3 44.Rd2 Ke7 45.Re2 Kf7 46.Kd6 Rd3 47.Ke5 g6 48.hg6 hg6 49.Rc2 Re3 50.Kd6 Rc3 51.Rh2 Kg7 52.Rd2 Rc8 53.Rd5 Rd8 ½–½. Kruimer,Wim – Blankenberg,Bruno, corr TKM/A008, 1999.

5.Bg2 Be7 6.c4 0–0 7.Nf3 Be6 8.d3 Nbd7 9.Ng5 c6 10.Nc3 d5 11.Ne6 fe6 12.0–0 Bb4 13.bc6 bc6 14.Qc2 Ng4 15.h3 Ngf6 16.Nd1 Bd6 17.Rb1 Rb8 18.Nc3 Rc8 19.Na4 Qc7 20.Rfc1 Be7 21.e3 Qd6 22.f4 c5 23.Nc3 ef4 24.ef4 dc4 25.dc4 Qd4 26.Kh2 Qd6 27.Nb5 Qa6 28.Rd1 a4 29.Be5 Rfd8? (better is 29...Nb6+–) 30.Nc7 Rc7 31.Bc7 Re8 32.Bb7 Qa7 33.Qg2 Bd8 34.Be5 Rf8 35.Qc6 Kh8 36.Bf6 Nf6 37.Qd6 (37.Qd6 Rg8 38.Qd8+–) 1–0. Stefanov,Plamen (2185) – Amir,Jacob, IECG, 2004.

5.Bg2 Be7 6.Nf3 =.

5.Bg2 g6 6.c4 Nbd7 7.Nc3 Bg7 8.d3 0–0 9.Nf3 Nc5 10.Nd2 Nfd7 11.h4 h6 12.Qc2 Ne6 13.e3 Ndc5 14.Ne2 f5 15.a4 Nd7 16.d4 ed4 17.ed4 Nf6 18.0–0–0 d5 19.cd5 Nd5 20.Nc4 Re8 21.Ne5 Nf8 22.Bd5+= Qd5 23.Nf4 Qd6 24.Rhe1 Bd7 25.Qb3 Be6+= 26.Ne6 Qe6 27.d5 Qb6? 28.d6+– Kh7 29.d7 Red8 30.h5 g5? 31.f4 g4 32.Qc2 (32...Qf6 33.Bd4+– (33.Qc7?! Nd7 34.Rd7 Rac8+–)) 1–0. Basman,Michael – Lee,RA, Exeter, 1980.

5.Bg2 g6 6.c4 Nbd7 7.Nc3 Bg7 8.Nf3 0–0 9.0–0 Nc5 10.d3 Re8 11.Qc2 Bf5 12.Rad1 Qc8 13.Ng5 h6 14.Nge4 Nfe4 15.de4 Be6 16.Nd5 Bd5 17.cd5 b6 18.h4 Qd7 19.a4 g5 20.hg5 hg5 21.f3 Rf8 22.Bc1 f6 23.Be3 Kf7 24.Kf2 Rh8 25.Rh1 Rag8 26.Rdg1 Bf8 27.Qd1 Ke8 28.g4 Qf7 29.Bc1 Qg7 30.Be3 Rh1 31.Rh1 Rh8 32.Rh8 Qh8 33.Kg1 Qg7 34.Bf2 Kd7 35.e3 Be7 36.Bf1 Bd8 37.Kg2 Be7 38.Bc4 Bd8 39.Qc2 Be7 40.Be1 Qh8 41.Bc3 Qh4 42.Qd1 Bd8 43.Bb2 Be7 44.Ba3 Nb7 45.Qc1 Bf8 46.Bd3 Nc5 47.Bc2 Be7 48.Qd1 Nb7 49.Bb3 Bf8 50.Qc1 Nd8 ½–½. Hort – Wittmann.

5.Bg2 g6 6.c4 Bg7 7.Nc3 Nbd7 8.Nf3 0–0 9.0–0 Nc5 10.d3 Re8 11.Qc2 Bf5 12.Rad1 Qc8 13.Ng5 h6 14.Nge4 Nfe4 15.de4 Be6 16.Nd5 Bd5 17.cd5+= b6 18.h4 Qd7 19.a4 g5 20.hg5 hg5 21.f3 Rf8 22.Bc1 f6 23.Be3 Kf7 24.Kf2 Rh8 25.Rh1 Rag8 26.Rdg1 Bf8 27.Qd1 Ke8= 28.g4 Qf7 29.Bc1 Qg7 30.Be3 Rh1 31.Rh1 Rh8 32.Rh8 Qh8 33.Kg1 Qh7 34.Bf2 Kd7 35.e3 Be7 36.Bf1 Bd8 37.Kg2 Be7 38.Bc4 Bd8 39.Qc2 Be7 40.Be1 Qh8 41.Bc3 Qh4 42.Qd1 Bd8 43.Bb2 Be7 44.Ba3 Nb7 45.Qc1 Bf8 46.Bd3 Nc5= 47.Bc2 Be7 48.Qd1 Nb7 49.Bb3 Bf8 50.Qc1 Nd8 ½–½. Hort,Vlastimil – Wittmann,Rainer, BL2–West7980, 1980.

3.Bb2 e4

4.a4 d5 5.e3 Nf6 6.c4 Be7 (6...dc4 7.Bc4 Bb4 8.Ne2=+) 7.cd5= Qd5 8.Nc3 (8.Qc2 Qd6=) 8...Qe6 (8...Qf5 9.Qc2=) 9.Qc2 0–0 (9...Nbd7 10.f3 ef3 11.Nf3=) 10.Nge2 (10.Nh3 Qe5=) 10...Nbd7 (10...Bb4!?=) 11.Nf4+= Qf5 12.Be2 (12.d3 Nc5+=) 12...g5 (12...Nc5 13.Rd1=) 13.Nh3 (13.g4 Ng4 14.Bg4 Qg4+=) 13...Ne5 (13...Nc5 14.0–0=+) 14.0–0 (14.Ne4 Ne4 15.f3 Nd2 16.Qf5 Bf5 17.Be5=) 14...Nf3 (14...Be6 15.Qc1=+) 15.Kh1 (15.gf3 Qg6 16.Ng5 Qg5 17.Kh1 ef3 18.Bf3+–) 15...g4?? (15...Nh4 16.Ng1+=) 16.Nf4?? (16.gf3!? ef3 17.Bd3 Qc5+–) 16...Nh4? (better is 16...Nd4! 17.Ncd5 Nd5 (17...Nc2?? 18.Ne7 Kg7 19.Nf5 Bf5 20.Rac1+–) 18.Nd5 Qd5 (18...Nc2 19.Ne7) 19.Bd4 Bd6+=) 17.d3+– ed3 (better is 17...Ng6 18.de4 Qc5+–) 18.Bd3 (18.Qd3?! Rd8 19.Qc4 Bd6+/–; 18.Nd3?! Be6+=) 18...Qg5 19.Ncd5!! Nd5 (19...Qd5 20.Nd5) 20.Nd5 (20.Bh7) 20...Qd5 (20...f5 21.Nc7 Rb8 22.Bc4 Rf7+–) 21.Bh7 1–0. ZMeB4 (1685) – sentry, caissa.com, 2007.

4.c4 Nf6 5.Nc3 d5 6.e3 (6.cd5 Bf5+=) 6...c6 (6...dc4 7.Qc2 Bf5 8.Bc4=) 7.a4 (7.d3 dc4 8.dc4 Nbd7=) 7...Bb4=+ 8.Qc2 Bf5 (8...0–0 9.cd5 cd5 10.Rc1=+) 9.Na2 (9.Nge2 0–0=) 9...0–0 (9...Be7 10.cd5 cd5 11.Nf3=+) 10.Nb4= ab4 11.c5 cb5 12.ab5 Ra1 13.Ba1 Nbd7 14.c6 (14.Ne2!?=) 14...bc6=+ 15.bc6 Qc7 16.Qa4 Ne5 (16...Nb6 17.Qb5=+) 17.Be5 (17.Bb5 Rb8=+) 17...Qe5=+ 18.Ne2 (18.Qb4?? Qa1 19.Ke2 Bc8–+) 18...Rb8 19.Nd4 Ng4 (19...Ne8!?=+) 20.h3 b3 (20...Nh6 21.Bb5+=) 21.Nb3 (better 21.Bb5 b2 22.Qa2+–) 21...Ne3 (21...Qb2 22.hg4 Qb1 23.Ke2 Rb3+–) 22.fe3+– (22.de3 Qc3 23.Kd1 Qb3 24.Qb3 Rb3–/+) 22...Qg3 23.Kd1 Qd6 (23...Bg6+–) 24.Bb5 (24.Nd4 Bg6+–) 24...Be6 (24...Bg6 25.g4+–) 25.Nd4 Qc5 (25...Qd8 26.Qa7 (26.Ne6?! fe6 27.Rf1 Qc7+–) 26...Qc8 27.Ba6+–) 26.Ke2 (26.Rf1 Qe7+–) 26...h5 (26...Bc8 27.Kf2+–) 27.Ra1 g5 (27...Qd6 28.Qa7 Qg3 29.Rf1+–) 28.Qa7 Qa7 (28...Rb5 29.Qa8 Qf8 30.Nb5 Kg7+–) 29.Ra7 Rc8 (29...Bc8 30.c7 Rb5 31.Nb5+–) 30.Ba6 Rb8 (30...Rc6 31.Nc6 Kg7+–) 31.c7 Re8 32.Ne6 fe6 33.c8Q (33.c8Q Rc8 34.Bc8+–) 1–0. AhmedSultanov (1850) – shantown (1865), lichess.org, 2019.

4.c4 f5

5.Bd4 d5 6.cd5 Qd5 =.

5.e3 Nf6 6.d4 d5 7.cd5 (7.Be2 Bb4 8.Bc3 Bd6=) 7...Nd5+= 8.a3 Be6 9.Nc3 Nd7 10.Nd5 Bd5 11.Ne2 Bd6 12.Nc3 Bf7 13.Be2 0–0 14.0–0 (14.Qc2 Nb6=) 14...Nb6 15.a4 Nc4 16.Bc4 (16.Rb1 Qh4 17.h3 g5+= (17...Nb2?! 18.Rb2 Rac8 19.Qd2+=)) 16...Bc4 17.Re1 Qh4 Black prepares f4 18.g3 Qh3 19.f4 ef3 20.Qf3 (20.Qf3 Rab8 Decoy) 20...f4 21.ef4 Bf4 22.Qg2 (22.Qb7 Be3 23.Kh1 Rf2 24.Qb8 Rb8 25.Re3 Qh2) 22...Qg2 23.Kg2 Bd6 24.Rac1 Bb3 25.h3 Bb4 26.Re5 Rf7 27.Ra1 (27.Rf1 Rd7–/+) 27...Raf8 28.Ne4 Bc2 (28...Bc2 29.Kg1 Rf3–/+) 0–1. Fournier,Frederic – Lavoisier,Fabrice, AJEC Defi, 1995.

4.e3 d5

5.c4 Bf5 6.cd5 Qd5 7.Nc3 Qd6 8.a4 Nd7 9.Ba3 Nc5 10.g4 (10.Rc1 Nd3 11.Bd3 Qd3 12.Bf8 Kf8+=) 10...Bg6=+ 11.h4 h6 12.h5 Bh7 13.Bc5 Qc5 14.Rc1 Qd6 15.Bc4 Nf6 16.Qb3 Bg8 (16...0–0–0 17.Rc2 Ng4 18.Bf7=+) 17.Nd5. wg_ffm – Mensch, 2017.

5.c4 Bf5 6.cd5 Qd5 7.Nc3 Qd6 8.a4 Nd7 9.Ba3 Qe6 10.Bf8 Kf8. wg_ffm – Stockfish 8, 2017.

5.c4 Bf5 6.cd5 Qd5 7.Nc3 Qd6 8.f3 Nf6+=.

5.d3 Bb4 6.c3 Bd6 7.de4 de4 8.c4 Nf6 9.c5 Bc5 10.Qd8 Kd8 11.a3 Nbd7 12.Nd2 Bd6 13.Rd1 Ke7 14.Rc1 Nc5 (14...Rd8 15.Nh3 Kf8 16.Ng5=+) 15.Be2 (better is 15.Bd4!? Nfd7 16.Nh3=) 15...Nd3 16.Bd3 ed3 17.Nc4 (17.Ngf3 Bf5=) 17...Re8 (better is 17...Bd7!?=+) 18.Nd6 Kd6 19.Bf6 gf6 20.Kd2 (20.Rc3 Bf5=) 20...Bd7 21.Rb1 Rg8 22.g3 Rge8 23.Nf3 c5 24.Kc3 Rac8 25.Nd2 c4 26.Rhd1 (26.Nc4? Kd5 27.f3 Rc4 28.Kd3 Rec8–+) 26...Be6 27.b6 f5 28.h4 Bd5 29.h5 Rc5 30.Rb2 Rec8 31.h6 Rg8 32.Rdb1 (32.Rc1 Kc6=+) 32...Rg4 33.Rb5 Bc6 34.Rc5 Kc5 35.Rc1 (better is 35.Rb2=) 35...Bd5–+ 36.a4 Rg6 37.Rb1 Rb6 38.Rb6 Kb6 39.Kd4 Kc6 40.f3 (better is 40.Nb1–+) 40...b5 41.ab5 Kb5 42.Kc3 a4 43.Nb1 f6 44.Na3 Kc5 45.f4 (45.g4 d2 46.Kd2 fg4 47.fg4–+) 45...Bf7 46.Nb1 Be6 47.Kd2 (47.Na3–+) 47...Kb4 48.Nc3 a3 49.g4 (49.Na2 Kb3 50.e4 Ka2 51.Kc3–+) 49...fg4 (50.Na2 Kb3 51.Nc1 Kb2 52.Nd3 cd3 53.Kd3 g3–+) 0–1. MT – guest2116, ICC, 2004.

5.d3 Nd7 6.de4 de4 7.Ne2 =.

5.d3 f5 6.de4+= fe4 (6...de4!? 7.Qd8 Kd8+=) 7.Qh5+/– Ke7 8.Ba3 (8.Ba3 Ke6 9.Nh3 Ba3 10.Nf4 (10.Na3?! Nf6 11.Nf4 Ke7 12.Qe5 Kf7+=) 10...Ke7 11.Nd5 (11.Na3?! Nf6 12.Qe5 Kf7+=) 11...Kf8 12.Na3+–) 1–0. michaelbuss – willow27, ChessWorld.net, 2007.

5.d3 Bf5 6.Qh5 (6.de4 Be4 7.Nd2 Nf6=) 6...g6 (6...Bg6 7.Qe5 Ne7 8.Nc3=) 7.Qd1 f6 (7...Bb4 8.Nc3=) 8.Nd2 (8.de4 de4 9.Qd8 Kd8+=) 8...Qd7 (8...h5 9.de4 de4 10.Ne2+=) 9.de4+= de4 10.a4 (10.Be2 h5+=) 10...Bg7 (10...Bb4 11.Ne2=) 11.b6 (11.h3 Qe7+=) 11...Ne7 (11...Nc6 12.bc7 Rc8 13.Nc4 Qd1 14.Rd1+=) 12.bc7 Nbc6 (12...Qc7 13.g4 Be6 14.Ne4+=) 13.Bb5 (13.Nc4 Qc7 14.Qd6 Qd6 15.Nd6 Kd7+=) 13...Rc8 (13...0–0 14.Qe2+=) 14.Bc3 (14.Nc4!? Rc7 15.Na5+=) 14...Qc7= 15.Ne2 Nd5 16.Nb3 (better is 16.Bb2=) 16...Rd8 (better is 16...Nc3 17.Nc3 Rd8=) 17.Ba5+/– b6 18.Ned4 Bd7 (better is 18...Nde7 19.Bb4 Kf7 20.Be7 Ne7+/–) 19.Nc6?? (better is 19.Bc6 Bc6 20.Ne6+–) 19...Bc6= 20.Bc6 Qc6 21.Nd4 Qd6 22.Bd2+= f5 23.Nb5 Qc5+= 24.Ra3 0–0 25.0–0 Rd7 26.Qe2 Rc8 27.a5 Qc2 28.a6? Qc6?? 29.a7 Ra8 30.Rc1 Qb7 31.Qc4 Bb2–/+ 32.Qc8? Kg7 33.Qb7 Rb7 34.Bc3 Nc3 35.Rcc3 Bc3 36.Rc3 Rd7 37.g3… (41) ½–½. Rindansholt,P – Lea,Per, Oslo Norway, 1968.

4.f3 d5

5.e3 Qg5 6.Nc3 Nf6 7.f4 Qh4 8.g3 Qh6 9.d3 Bb4 10.a3 Bc3 11.Bc3 0–0 12.Bd4 Bf5 13.Be2 Nbd7 14.Qd2 Qg6 15.Qc3 Rfc8 16.Bf6 Nf6 (16...gf6?! 17.Rd1=) 17.d4 c6 18.b6 c5 19.Ra2 Nd7 20.Rb2 Nb6 21.Qb3 Nc4 22.Bc4 dc4 23.Qc4 cd4 24.Qd4 Rd8 25.Qc5 Bg4 26.Rb1 Rac8 27.Qe5 Rc2 28.f5 Qa6 0–1. MT – guest1864, ICC, 2004.

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    Available lines:
  • 1.b4 (4 players, 1 day/move)
  • 1.b4 (4 players, 10 days/move)
  • 1.b4 e5 2.Bb2 Bb4 3.Be5 Nf6 (4 players, 3 days/move)
  • 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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