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TESTA350 Release 2021-06-02
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(c) Marek Trokenheim

1.b4 a5 2.b5 d5

(...)

3.Ba3 e5 4.Bf8 Kf8 5.Nc3 +=.

3.Ba3 Bf5 4.Nf3 Nd7 5.e3 c5 (5...Ngf6 6.d4=) 6.bc6+= bc6 7.Nd4 Bg6 (7...Be4 8.f3 Bg6 9.Nc6+=) 8.Nc6 Qb6 9.Nd4 e5 10.Bf8 Nf8 (10...Kf8 11.Nb5+=) 11.Bb5+– Nd7 12.Bd7 Kd7 13.Nf3 f6 14.Nc3 Ne7 15.Nh4 Rab8 16.0–0 Qc6 17.f4 e4 (17...d4 18.Ng6 hg6 19.Ne2+–) 18.Qg4 (18.f5 Bf7 19.Qg4+–) 18...f5 19.Ng6 hg6 20.Qe2 Rb2 (20...Qc4 21.Qd1+–) 21.Rfb1 Rhb8 22.Qd1 d4 23.Ne2 de3 24.de3 Kc8 (24...Ke8 25.Qc1 Qb7 26.Nc3+–) 25.Rb2 Rb2 26.c4! Qc5 (26...Qc4 27.Qc1 Double attack (27.Qc1 Decoy)) 27.Qd4 (27.Nd4 Qb4 28.a3 Qc3+–) 27...Qb4?? (better 27...Qd4 28.Nd4 Kc7+=) 28.Rd1+– (28.Rd1 Kb7 29.Qd8+–) 1–0. Pleschke,Helmut – Mendosa,Gabriel, IECG, 1999.

3.a4 c6 (--> 1.b4 a5 2.b5 c6 3.a4 d5).

3.a4 Qd6 4.Nf3 h6 (4...Nf6 5.Ba3 Qb6 6.d4=) 5.Ba3+= c5 (5...Qg6 6.d4+=) 6.bc6 Qc6 (6...bc6 7.Bd6 Combination; 6...Nc6 7.Bd6 Combination; 6...Qc6 7.Nc3 Combination) 7.e3 (7.Nc3 Nf6+=) 7...Qe6 (7...Qa4 8.Nc3 Qd7 9.Bc5=) 8.Be2 (8.Nc3 Nf6+=) 8...Qf6 (8...Qg6 9.Nc3 Nf6 10.0–0+=) 9.Nd4 (9.Nc3 Qf5+–) 9...Bd7 (9...Nc6 10.c3=) 10.0–0 Ba4 11.Nc3 (better 11.Be7 Ne7 12.Ra4+–) 11...Bd7? (better 11...Bc6+=) 12.Nd5 Qe5 13.Bc4 e6 (13...Kd8+–) 14.f4 Qd5 15.Bd5 ed5 16.Bf8 Kf8 17.Qb1 Ra7 (17...Nc6 18.Qb7 Ra7+–) 18.Qb6 Ra6 19.Qd8 Be8 20.Qb8 Rg6 (20...h5 21.Qb7 Rhh6 22.Qd5+–) 21.Ra5 Ne7 (21...Nf6+–) 22.Ra8 (22.Ra8 Rg2 23.Kg2 Kg8 24.Qe8 Kh7 25.Qh8 Kg6 26.Rg1 Kh5 27.Kh3 f6 28.Nf5 Nf5 29.Qe8 g6 30.Qg6) 1–0. DEFFM – GuestDLQJ, freechess.org, 2018.

3.a4 e6 4.e3 (4.Nf3 Nf6=) 4...c6 (4...e5 5.Bb2 Bd6 6.Nf3=) 5.c4 (5.Nf3 Nf6=) 5...dc4 (5...cb5 6.cd5 ba4 7.de6 Be6 8.Qa4 Nd7 9.Nf3=) 6.Bc4 cb5 7.Bb5 (7.ab5 Nf6=) 7...Bd7 8.Qb3 Bb5 9.Qb5 Nd7 (9...Qd7 10.Nc3=) 10.Nc3 (10.Ba3 Rc8=) 10...b6 (10...Ra6 11.Rb1=) 11.Nf3 Bb4 12.Ne4 (12.Bb2 Ngf6=) 12...Rc8 (12...Ngf6 13.Nf6 Qf6 14.Rb1=) 13.0–0 Ngf6 (13...Ngf6 14.Nf6 Qf6+=) 0–1. afsharian – curietsk, lichess.org, 2018.

3.a4 Bg4 4.Bb2 Nf6 5.Bf6 ef6 6.g3 Bb4 7.c3 Bd6 8.d4 0–0 9.Bg2 c6 10.Qb3 Re8 11.Nf3 Nd7 12.e3 Re7 13.0–0 Qc7 14.Nbd2 Be6 15.Rab1 Nf8 (15...c5 16.b6 Qd8 17.Qb5=) 16.b6 Qd8 17.h3 (17.Rfe1!?=) 17...Nd7–/+ 18.Rb2 Ra6 19.Rfb1 Bf5 (worse is 19...Nb6 20.Bf1 Na4 21.Qa4+=; 19...Rb6?! 20.Qc2–/+) 20.e4 (20.Rd1 Rb6 (20...Nb6?! 21.Bf1 Nc4 22.Nc4 dc4 23.Bc4=; 20...Qb6?! 21.Qb6 Rb6 22.Ra2–/+) 21.Qa2 Bd3–/+) 20...Rb6 (20...de4 21.Nh4 Be6 22.Qc2–+) 21.ef5 (21.Qc2 Be4 22.Ne4 de4 23.Nh4–/+) 21...Rb3–+ 22.Rb3 b6 23.c4 Qc7 24.Rc1 dc4 25.Rc4 Bb4 26.Nf1 c5 27.Ne3 (27.Ne3 Qc6 28.dc5 bc5 29.Rb1 Qa4 30.Rcc1–+). Baer,Cy (1895) – Mangold,Wagner (1795), CiF, 2007.

3.ba6 Ra6 4.e4 (4.e3 Ra8=) 4...Re6=+ (worse 4...de4 5.Ba6 Na6 6.Ba3+=) 5.f3 de4 6.fe4 (6.Bc4 Rg6 7.Qe2 Nc6–/+) 6...Re4 7.Be2 Qd4 (better 7...e5–/+) 8.Nf3?? (better 8.Nc3 Re6 9.Nf3=+) 8...Qa1–+ 9.Nc3 Re6 (9...Rb4!? 10.a3 Rg4 11.h3–+) 10.Nd4 Rg6 (better 10...Re2 11.Nde2 e5–+) 11.Nb3= Qc3 (11...Qc1 12.Qc1 (worse 12.Nc1 Rg2 13.Bf3 Rg5=+) 12...Rg2 13.Qa3+=) 12.dc3 e5 13.0–0 Bh3 (13...Nc6!?+=) 14.Bf3 Nf6 15.Kh1 (15.Qe2 Bd6+–) 15...e4 (15...Bc8 16.Na5+=) 16.Be4 (16.gh3!? ef3 17.Qf3+–) 16...Ne4+= 17.gh3 Bd6 (17...Nd7 18.Qd4 Nd6 19.Qa4+–) 18.Qe2 (better 18.Qf3!? Nf6 19.Re1 Kd8 20.Na5+–) 18...Re6+= 19.Nd4 (better 19.Qb5!? c6 20.Qb7+–) 19...Ng3=+ (19...Nc3?? 20.Qg4 Nd5 21.Ne6 fe6 22.Qe6 Ne7 23.Qf7 Kd7 24.Qg7+–) 20.hg3 Re2 21.Ne2 Bg3?? (better 21...0–0=+) 22.Ng3+– 0–0 (22...Nc6 23.Nf5 Rg8 24.Nd4+–) 23.h4 (23.Re1 Na6+–) 23...Nc6 (23...Nd7 24.Re1+–) 24.h5 (24.Bf4 Rc8+–) 24...Ne5 (24...Ra8 25.a3+–) 25.h6 (25.Bf4 Re8+–) 25...Ng4 (25...Ra8 26.Bf4 Ra5 27.Nh5 gh6 28.Re1+–) 26.hg7 (26.Nf5 g6 27.Ne7 Kh8+–) 26...Re8 (better 26...Kg7 27.Nh5 Kg6 28.Nf4 Kf5 29.Nd5 Kg6 30.Nc7 Rd8+–) 27.Nf5 Re5 (27...h5+–) 28.Rg1 (better 28.Kg2+–) 28...Nf2+– 29.Kh2?? (better 29.Kg2 Rf5 30.Rf1+–) 29...Rf5–/+ 30.Rg2 (30.c4 h5–/+) 30...Rh5 (30...h5!? 31.Kg3 Ng4 32.Bf4–+) 31.Kg1 (better 31.Kg3 Ne4 32.Kf3–/+) 31...Rf5?? (better 31...Rh1 32.Kf2 Rc1–+) 32.Rf2+– Rf2 33.Kf2 Kg7 34.Ke3 (34.c4 Kf6+–) 34...Kf6 (34...Kg6 35.Kf3+–) 35.Ke4 (35.Kf4 h5+–) 35...Ke6 36.c4 c6 (36...h5 37.c5 c6 38.Bb2+–) 37.c3 (37.Kf4 Kf6+–) 37...f5 38.Kd4 (38.Kf4 Kf6+–) 38...b6 (better 38...Kd6+–) 39.Bf4 h5 (39...c5 40.Ke3+–) 40.c5 b5 41.c4 b4 42.Bd2 (42.Bg3 Kf6+–) 42...h4 43.Bb4?? (better 43.Ke3 h3 44.Kf3+– (44.Bb4?? h2–+)) 43...h3–+ 44.a4 h2 45.a5 h1Q 46.a6 (46.Bd2 Qd1 47.Kc3 f4 48.Bf4 Qf3 49.Kb4 Qf4–+) 46...Qd1 47.Ke3 (47.Kc3 f4 48.Kb2 Qa4–+) 47...Qa4 (better 47...Qb3 48.Kd4 Qb4 49.Kd3–+) 48.Bc3 (48.a7 Qa7 (48...Qb4?! 49.a8Q Qc5 50.Kf3–/+) 49.Kd3 Qa1–+) 48...Qa6 49.Kf4 (49.Kd3–+) 49...Qc4 50.Ke3 Qc3 (50...Qc3 51.Kf2 Qd2 52.Kg3 f4 53.Kf3 Qe3 54.Kg2 Qe2 55.Kh3 Qf2 56.Kg4 Qg3 57.Kh5 Kf5 58.Kh6 Qg6) 0–1. afsharian – py4nik, lichess.org, 2018.

3.Bb2 d4 4.Nf3 c5 5.bc6 bc6 6.c4 (better 6.Bd4 Bg4 7.e3+–) 6...c5= 7.e3 Bg4 (7...Nc6!?=) 8.ed4+– Bf3 (8...cd4!? 9.Bd4 Nc6+–) 9.Qf3+– (9.gf3?! cd4 10.Qa4 Qd7 11.Qd7 Nd7 12.Bd4 Ngf6+=) 9...Ra7 (9...Nd7 10.dc5 Nc5 11.d4+–) 10.dc5 e6 (10...e5 11.Qe3+– (11.Be5?! Re7=+)) 11.Be2 (better 11.d4 Rd7+–) 11...Bc5? (better 11...Rc7+–) 12.Bg7 Bb4 (12...Bd4 13.Bh8 Bh8+–) 13.Bh8 Ne7 (13...Rd7 14.0–0+–) 14.Bf6 (14.Qh5 Ng6 15.Qh7 Rd7+–) 14...Rd7 (14...Nd7 15.Bb2+–) 15.Nc3 (15.Qe4 Rd2 16.Nd2 Bd2 17.Kf1 Nd7 18.Be7 Ke7+–) 15...Rd2 (15...Nbc6 16.Qh5 Rd2 17.Qh7 Re2 18.Ke2 Nd4 19.Kf1 Bc3 20.Qh8 Kd7 21.Qd8 Kd8 22.Rc1+–) 16.0–0 (16.a3 Bc3 17.Qc3 Rd7+–) 16...Bc3 (16...Qc7+–) 17.Be7 (better 17.Bc3 Rd7 18.Qe4+–) 17...Qe7 (17...Ke7 18.Qc3 Re2 19.Rab1+–) 18.Qc3 Re2 19.Qa5 Kf8 (19...Nc6 20.Qa8 Nd8 21.Qf3+–) 20.Qb5 (20.Qh5 Re4+–) 20...Nd7 21.Rad1 Ne5 22.Qb8 (22.c5 Re4 23.Qb8 Kg7+–) 22...Kg7 23.Rfe1 Nf3 (23...Re1 24.Re1 Ng6+–) 24.Kf1 (24.gf3 Ra2 25.Kh1 Ra5 26.Rg1 Rg5 27.Rg5 Qg5+–) 24...Ne1?? (24...Re1 25.Re1 Ne1 26.Ke1 Qf6 27.Qg3 Kf8 28.Qa3 Ke8 29.Qa8 Ke7 30.Qa7 Kf8 31.Qc5 Kg8+–) 25.Qg3 (25.Re1?! Ra2 26.Qg3 Kh6+–) 25...Kf8 26.Re1 (better 26.Ke2 Ng2 27.Qg2+–) 26...Ra2 (26...Re1 27.Ke1 Qb4 28.Kd1 Qc4 29.a3+–) 27.Rb1 Qc5?? (better 27...Qd8+–) 28.Rb8+– Ke7 29.Rb7 (29.Qh4 Kd6 30.Qf4 Kc6 31.Rc8 Kd7 32.Rc5 Ra1 33.Ke2 Ra2 34.Kd3 Ra3 35.Kd4 Ra7 36.Qf7 Kd8 37.Qa7 e5 38.Ke5 h5 39.Qb8 Kd7 40.Rc7) 29...Kf8+– 30.Rb8 Ke7 31.Qh4 f6 32.Qh7 Kd6 33.Rd8 Ke5 (33...Kc6 34.Qd7 Kb6 35.Rb8 Ka5 36.Rb5 Ka4 37.Qd1 Rc2 38.Qc2 Ka3 39.Qb3) 34.Qh5 f5 35.Qh8 Ke4 36.f3 Ke3 (36...Kf4 37.Qh6 Ke5 38.Qg7 Kf4 39.Qg3 Ke3 40.f4 Ke4 41.Qf3) 37.Qc3 (37.Qh6 f4 38.Qe6 Qe5 39.Qe5) 37...Kf4 38.Rd4 (38.g3 Kg5 39.Qg7 Kh5 40.Rh8) 38...Kg5+– 39.h4 (better 39.Qe3 f4 40.Qf4 Kg6 41.Qg4 Kf6 42.Qh4 Qg5 43.Rf4 Kg6 44.Rg4+–) 39...Kg6 40.f4 (better 40.Qe3 Ra1 41.Kf2+–) 40...Ra5?? (40...Ra3 41.Qd2+–) 41.Qg3 (better 41.Rd7 Ra1 42.Qa1 Qc4 43.Kg1 Qc5 44.Kh2+–) 41...Kf7 42.Qd3 Ra1 43.Kf2 Ra2 (better 43...Ra3 44.Qd1 Kf6+–) 44.Kf3?? (better 44.Kg1 Ra3 45.Qd1+–) 44...Qc6 (better 44...Ra3–+) 45.Rd5–/+ Qa4 (45...ed5 46.Qf5 Ke7 47.Qe5 Kd7 48.Qd5 Qd5 49.cd5–/+) 46.Rd7 Kg6 47.h5 Kh5?? (47...Kh6 48.g4 Ra3–+) 48.Rh7?? (better 48.Qd1 Ra3 49.Kf2 Qd1 50.Rd1+–) 48...Kg6–+ (48...Kg6 49.Rd7 Ra3–+) 0–1. GuestSJQW – GuestBDHK, freechess.org, 2017.

3.c4 e6 4.a4 (4.e3 Nf6=) 4...Nf6 5.Nf3 Be7 (5...dc4 6.Qc2=+) 6.d4 0–0 7.e3 c5 8.Nbd2 b6 9.Bb2 Bb7 10.Be2 cd4 11.Bd4 dc4 12.0–0 c3 13.Nc4 Nbd7 14.Bc3 Ne4 15.Bb2 Bd5 16.Nfd2 Nd2 17.Nd2 Rc8 18.Rc1 Nc5 19.Bd4 Nd7 (19...Bd6 20.f4=) 20.e4 Bb7 21.Rc8 Qc8 22.Qa1 White intends e5 22...Qc2 23.Rd1 Bf6 24.e5 Be7 25.Bf3 Bf3 (25...Bc5 26.Bc3 Bf3 27.Rc1=) 26.Nf3 (26.gf3? Rd8 27.Bc3 Nc5–+) 26...Bc5 27.h4 (27.Rd2 Qe4+=) 27...h6 28.Rd2 Qe4 29.Qd1 Bb4 30.Rc2 (30.Qc2 Qb7 31.Qc6 Qb8=) 30...Nc5 31.Bc5 Bc5 32.Rd2 Kh7 33.Rd7 f6 34.ef6 Rf6 35.Rd2 Rg6 36.Kh2 Rg4 37.Kh3 (37.Re2!? Qf4 38.Kh1=) 37...Rf4=+ 38.Ra2 (38.Re2 Qc4=+) 38...Be7 (38...Qf5!? 39.Kh2 e5–+) 39.Kh2–/+ Bh4 40.Re2 Qa4 (better 40...Qc4=+) 41.Qa4?? (better 41.Qd3 Kg8 42.g3+=) 41...Ra4–+ 42.g3 Be7 43.Ne5 Bc5 44.Nd3 Bd6 45.Re6 Rd4 46.Ne5 (46.Nc1 a4 47.Ne2 Rd2–+) 46...Be5 47.Re5 Rb4 (47...Rb4 48.f4 a4–+) 0–1. Drazic,S (2440) – Saptarshi,R (2475), Third Saturday, 2018.

3.d4 e5 4.de5+= Bc5 5.e3 Nd7 (5...Nh6!?+=) 6.Qd5+/– Ne7 7.Qe4 Nb6 (7...f5 8.ef6 Nf6 9.Qe5 Bb4 10.c3+/–) 8.Ba3 Bf5 9.Qb7 ( 9.Qf3 Bb4 10.c3 Ba3 11.Na3+/–) 9...Rb8? (9...Bc2 10.Qf3 Bb4 11.Bb4 ab4=+) 10.Qf3+– Qd7?? (10...Nd7 11.Bc5 Nc5+–) 11.Bc5 Bg4 12.e6! Qe6 13.Qg3 Qd5 14.Qg4 (14...Qc5 15.Qg7+–) 1–0. Kuhlmann,Antonius Egidius J – Wittig,Frank, CiF, 1986.

3.e3 c6 4.c4 e6 5.Bb2 Nf6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c6 5.c4 a5).

3.e3 d4 4.Bb2 de3 5.fe3 Nf6 6.c4 Bf5 7.Qb3 (7.Nf3 e6=) 7...Ne4 (7...Nbd7 8.d4=+) 8.Nf3 Nc5 9.Qc3 Na4 10.Qe5 Bd3 (10...e6 11.Ba3 Nd7 12.Qf4=+) 11.Ba3 (11.Bd3 Qd3 12.Qc7 Nb2 13.Qb7 Qc4 14.Qa8 Nd3 15.Kf1 Ne5 16.Kg1 Nf3 17.Kf2+–) 11...Nd7= 12.Qd4 Bf1 13.Rf1 c5 ( 13...Nf6=) 14.bc6+– bc6 15.c5 e6? (15...Nac5 16.Bc5 e5 17.Ne5 Bc5 18.Qd7 Qd7 19.Nd7 Kd7 20.Rf7 Ke6 21.Rg7 Bd6+/–) 16.Qa4 (16...Bc5 17.Bc5 Nc5 18.Qc6 Nd7 19.Nc3+–) 1–0. Otte,Marco – Ten Thije,Hens, Wag.Intcomp Wageningen, 2001.

3.e3 Qd7 4.a4 (4.Nf3 Nf6+=) 4...c6 (4...e5 5.Bb2 Qe6 6.Nf3=) 5.c4 (5.Nf3 Qc7=) 5...cb5 (5...e5 6.Bb2 Qe6 7.Nf3=) 6.cb5 (6.cd5 Qd5 7.Nc3 Qd8 8.Bb5 Bd7+=) 6...Nf6 (6...e5 7.Bb2 Qe6 8.Nf3=) 7.Qb3 (7.Nf3 e6=) 7...e6 (7...e5 8.Bb2 Qe6 9.Ne2=) 8.Bb2 Bb4 (8...Qd8 9.Nf3=) 9.Bf6 gf6 10.Bd3 (10.Nc3 Qd6=) 10...0–0 11.Ne2 Kh8 12.0–0 Rg8 13.Nbc3 Qd6 14.Rab1 Qe5 (14...Nd7 15.Qc2=) 15.f4 Qg5?? (better 15...Qh5+=) 16.fg5+– Rg5 17.Ng3 (17.Rf6 Rg7+–) 17...Rg3 (17...Nd7 18.Rbc1+–) 18.hg3 Nd7 19.Qc2 (better 19.Nd5 ed5 20.Qd5 Kg7+–) 19...Nc5 (19...h6 20.Rf4+–) 20.Bh7 (20.Rf6 e5 21.Nd5 Kg7 22.Rb4 ab4 23.Qc5 Be6 24.Re6 Ra4 25.Re8 Ra1 26.Kf2 Rf1 27.Kf1 e4 28.Qd4 Kg6 29.Qf6 Kh5 30.Be2) 20...Bd7 21.Rf6 (21.Rf6 Be8 22.Rf4+–) 1–0. afsharian – AmmarSinaga, lichess.org, 2018.

3.e3 Nd7 4.a4 e5 5.Bb2 b6 (5...Ngf6 6.Nf3 Bd6 7.Be2+=) 6.Nf3= Bd6 7.d4 e4 8.Nfd2 Ngf6 (8...Ndf6 9.c4=) 9.c4 0–0 10.cd5 Nd5 (10...Bb7 11.Nc3+=) 11.Ne4 Re8 (11...Bb4 12.Ned2+=) 12.Nd6+/– cd6 13.Bc4 N7f6 14.Nd2 Bg4 15.Qb3 Be6 16.e4 (16.0–0 Nc7+/–) 16...Nb4 (16...Nf4 17.Be6 Re6 18.d5 N4d5 19.0–0+=) 17.0–0 (better is 17.Be6!? Re6 18.f3+/–) 17...Bc4= 18.Qc4 (18.Nc4 Ne4 19.f3 Nf6=) 18...Ne4 19.Ne4 Re4 20.Rac1 (20.Rae1 d5 21.Qb3 Qe8 22.Re4 Qe4=) 20...d5+= 21.Qb3 Qd6 22.Qh3 Rd8 (22...Qe6 23.Qe6 Re6 24.Rc7=) 23.Rc8 h6 24.Rfc1 (24.Qg3 Qf6 25.Rd8 Qd8=) 24...Rc8 25.Rc8 Kh7 26.g3?? (better is 26.Qf5 Qg6 27.Qg6 Kg6 28.Kf1=) 26...Re1–+ 27.Kg2 Qe7?? (better is 27...Qg6 28.Qh4 Re2–+) 28.Qf5= g6 29.Qf4?? (better is 29.Qf3=) 29...Nd3–+ 30.Qd2 (30.Qf3 Nb2 31.Rc2–+) 30...Nb2 (30...Qe4 31.f3 Re2 32.Kh1 Qf3 33.Kg1 Qg2) 31.Rc3 (31.Qc2 Qe4 32.Qe4 Re4–+) 31...Nc4 (31...Qe4!? 32.Kh3 Re2 33.Qf4 Qf4 34.gf4 Rf2 35.Kg3–+) 32.Qf4 Kg7 33.Rf3 f5 (33...Re4 34.Qc1–+) 34.h3 Re4 35.Qc1 ½–½. Fournier,Frederic – Cadet,Yves, Ch Club, 1996.

3.e3 e6 4.Bb2 Nf6 5.Nf3 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3).

3.Ba3 c6

4.bc6 Nc6 5.e3 Nf6 6.d3 (6.Nf3 Bg4=) 6...g6 (6...e5 7.Bf8 Rf8 8.d4=+) 7.Nd2 Bg7 8.Rb1 0–0 9.Ne2 (9.d4 Nb4=+) 9...Re8 (9...Rb8 10.d4=+) 10.Nc3 (10.d4 Nb4=+) 10...Rb8 11.d4 e5 12.de5 Ne5 13.Nb3 Nc6 (13...Bg4 14.Qd2=+) 14.Bb5 Bg4 15.f3? ( 15.Qd2!?=+) 15...Re3–/+ 16.Ne2 Bd7 (16...Bf5 17.Bc5 Re8 18.Nbd4–/+) 17.Bc5 Re8 18.Qd2 (18.0–0 Rc8–/+) 18...b6 (18...Ne5 19.Nbd4–+) 19.Bd6 Ra8 20.Nbc1 Re6 21.Bg3 Be8 22.0–0 Nh5 23.Bf2=+ Rb8 24.g4 Nf6 25.Nf4 Rd6 26.Nfd3=+ Re6 27.Bg3 Rc8=+ 28.c3 Nb8 29.Nf4 Rd6 30.Nce2 Rc5 31.Be8 Ne8 32.Nd3 Rcc6 33.Bd6 Qd6 34.Nd4+/– Rc8 35.Rfe1 Nc7 36.Qf4 Qd8 37.Ne5+/– Be5 38.Qe5 Nd7 39.Qe7+– Na8 40.Qd8 Rd8 41.Nc6 Rf8 42.Ne7 Kg7 43.Nd5 Rb8 44.Re2 Nc5 45.f4 Na4 46.Re4 Nc5 47.Rc4 Nd7 48.Rc6 b5 49.a4 (49...ba4 50.Rb8 Nb8 51.Rc8+/–; 49.Ra6 a4 50.c4+–) 1–0. Andersson,Lars H – Hansen,Bjarne G, corr ICCF TT–4–90–se, 1995.

4.e3 Nf6 =.

3.Ba3 Nf6

4.e3 e5=+ 5.Bf8 Kf8 6.c4 c6 (6...Bg4 7.Be2 Be2 8.Qe2=) 7.Nf3 Bg4 8.Qb3 (8.d4 e4 9.h3 Bh5=) 8...e4 (8...Bf3 9.gf3 a4 10.Qa3 Qe7 11.c5=+) 9.Nd4 (9.Ne5 a4 10.Qb4 Qe7 11.Qe7 Ke7=) 9...c5=+ 10.Ne2 (10.f3 a4 11.Qa3 Qe7=) 10...Be6 (10...dc4 11.Qc4 b6 12.Nbc3=) 11.Nf4= Qd6 (11...Kg8 12.Ne6 fe6 13.d4=) 12.cd5 (12.Ne6 Qe6 13.d4 a4+=) 12...Nd5+= 13.Ne6 fe6 (13...Qe6!? 14.Nc3 Nf6+=) 14.Qc2 Nf6 (14...Kf7 15.Qe4 Nd7 16.Nc3+/–) 15.Nc3+/– b6 (15...Kf7 16.Ne4 Qe5 17.Nc3+/–) 16.Ne4 Qe5 17.Nc3 Kf7 18.f4 Qc7 19.Bc4 Rd8 (19...Nbd7 20.Rc1+–) 20.f5 (20...Qd6 21.Be6 Kf8 22.Rd1+–) 1–0. Andersson,Lars H – Wartig,Wolfgang, corr SOK–92–80, 1992.

4.e3 e5=+ 5.Bf8 Kf8 6.d4 Bg4 7.f3 Bf5 +=.

4.e3 e5 5.Bf8 Kf8 6.Nf3 +=.

4.e3 e5=+ 5.Bf8 Rf8 6.d4 Bg4 7.f3 =.

4.e3 g6 5.Nf3= Bg7 6.d4 0–0 7.Bd3 (7.Nc3 Nbd7=) 7...c6 (7...Nbd7 8.Nc3+=) 8.c4 (8.Nc3 cb5 9.Nb5 Nc6=) 8...Be6 9.cd5 (9.Ng5 Bg4 10.f3 Bf5=) 9...Nd5 (worse is 9...Bd5 10.Nc3=) 10.0–0 cb5 11.Bb5 Nc6 12.Qd2 Rc8 (12...Qb6 13.Bc6 Qc6 14.Rc1+=) 13.Bb2 Bg4 14.Be2 Nb6 15.Rd1 e5 16.Qe1 (16.Ne5!? Ne5 17.de5 Qd2 18.Rd2 (18.Nd2?? Be2 19.Rdb1 Bd3–+) 18...Be2 19.Re2–+) 16...ed4–/+ 17.Nd4 Be2 18.Ne2 Qd1 (18...Bb2!? 19.Rd8 Rfd8–/+) 19.Qd1+= Bb2 20.Nd2 Ba1 21.Qa1 Rcd8 (21...Rfd8 22.Ne4 Nd5 23.h4+=) 22.Nf3 Nc4 (22...Rd6 23.h4+=) 23.h4 Rd7 (23...Rfe8 24.h5 N6e5 25.h6=) 24.Qc3= Nd6 (24...Nb6 25.Ned4 Nd5 26.Qb2=) 25.Ned4 Ne4 26.Qc4 Re8 (26...Nb4 27.a3 Nd5 28.Ne5+=) 27.h5 Rd6 (27...Rc7 28.h6+=) 28.h6 Kf8 (28...Nf6 29.g3+=) 29.Qa4+= Nd4 (29...Re7 30.Nc6 bc6 31.g3+=) 30.ed4 g5 (30...b6 31.Ne5 Rc8 32.f3+=) 31.Qa5+/– Rh6 (31...Rg6 32.Qd5 Nd6 33.g3+/–) 32.Qf5 Re7 (32...f6 33.g4+/–) 33.Ne5 Nd6 (33...f6 34.Qc8 Re8 35.Nd7 Kf7 36.Qb7 Re7+–) 34.Qg5+– Rhe6 35.Qh5 f6 36.Ng4 f5 (36...Ne4 37.Qh6 Ke8 38.f3+–) 37.Ne5 Kg7 (37...Rf6 38.Qg5 Ne4 39.Qf4+–) 38.a4 (38.f4 Kf8 39.Qg5 h6+–) 38...h6 39.Qh3 Kg8 (39...Kh7 40.Kh2+–) 40.Qd3 (40.f4 Rf6+–) 40...Nf7 (40...Kg7 41.Qg3 Kh7 42.Qb3+–) 41.f4 Rf6 42.Qc4 1–0. manijer_wmp3 (2160) – calabuig (1995), gameknot.com, 2015.

4.Nf3 Bf5 =.

3.Ba3 g6

4.e3= Nf6 5.Nf3 =.

4.e3= Bg7 5.d4 (5.Nc3 Nf6=) 5...Nf6 6.Nf3 0–0 7.Bd3 (7.Nc3 Re8=) 7...Nbd7 8.Nbd2 Re8 9.0–0 e5 10.de5 Ne5 11.Ne5 Re5 12.Bb2 Re8 (12...Rg5 13.Nf3 Rh5 14.c4+=) 13.c4= dc4 14.Nc4 b6 (14...Be6 15.Qe2=) 15.Qc2 (15.f3 Qe7+=) 15...Bb7= 16.Rad1 (16.f3 Qe7=) 16...Qe7 17.f3 (17.Ba3 Qe6=) 17...Rad8 18.e4 Nd7 19.Bg7 Qc5 20.Rf2 (20.Bd4 Qd4 21.Qf2 Nc5 22.Qd4 Rd4=) 20...Kg7 21.Kh1 (21.Qb2 Nf6=) 21...Ne5 (21...Qb5?? 22.Nd6 Qc6 23.Ne8 Re8 24.Qb2 Qf6 25.Bb5 Qb2 26.Rb2+–) 22.Ne5 Re5 23.Qb2 Qd4 24.Qe2 (24.Qd4 Rd4 25.Rfd2 Rc5+=) 24...Rc5 25.Rff1 (25.Qe1 Qe5+=) 25...Qc3 26.f4 (26.Bb1 Rd6+=) 26...c6 27.f5 cb5 28.f6 Kg8 29.Bc4 Rcc8 30.Bd5 Bd5 31.ed5 Rd6 32.Qb5 Qc5 The isolani on d5 becomes a target 33.Qe2 (33.Qa6 Rcd8–/+) 33...Rd5–/+ 34.Rd5 (34.h3 h5–/+) 34...Qd5 35.Qe3 Qd8 (35...Qa2?? 36.Qh6 Qg2 37.Kg2 Rc2 38.Kg1 Rg2 39.Kg2 a4 40.Qg7) 36.Qh6 Qf8 37.Qe3 Rc6 38.Qd2 h5 39.h3 Rd6 40.Qe3 (40.Qf4 Qd8–/+) 40...Qd8 41.Qe7 (41.Qf4!?–/+) 41...Qe7–+ 42.fe7 Re6 43.Rb1 Re7 44.Rb6 Re2 45.a3 Re3 46.h4 (46.a4 Re4–+) 46...Ra3 47.Ra6 Ra1 48.Kh2 Kg7 49.Kg3 a4 50.Kf3 a3 51.Ra5 a2 52.Kg3 Kf6 53.Kh2 Ke6 54.Ra8 (54.g3 Kd6–+) 54...f6 0–1. manijer_wmp3 (2155) – forsetinn (2380), gameknot.com, 2015.

4.Nf3 Bg7 5.Nc3 d4 6.Na4 Nh6 7.c3 c6 8.e3 de3 9.de3 Nd7 (9...Qd1 10.Rd1 Bg4 11.Bd3=) 10.Bc4 0–0 11.bc6 bc6 12.0–0 Nf5 13.Qd3 Re8 (13...Ne5 14.Ne5 Be5 15.Rad1 Qd3 16.Bd3=) 14.Rfd1+/– Qc7 15.e4 Nd6 (15...Nh6 16.Rab1+/–) 16.Bd6+/– ed6 17.Qd6 Qd6 18.Rd6 Ne5 19.Bb3 Be6 20.Ne5 Be5 21.Rc6 Bd7 22.Rb6 Ba4 23.Ba4 Bc3 24.Rab1 Re7 25.Bc6 Raa7 (25...Rc8 26.Bb7 Rc4 27.a3+/–) 26.R6b3 Be5 27.g3 Rec7 28.Rb5 (28.Bd5!?+/–) 28...Bg3+= 29.hg3 Rc6 30.e5 Rc2 31.R1b2 Rb2 32.Rb2 Kf8 ½–½. Vettenburg,Louis – Doossche, corr Belgium.

3.a4 Bf5

4.Bb2 Nd7 5.e3 c5 6.c4 Ngf6 7.d3 Qc7 8.cd5 0–0–0 9.e4 Bg6 10.Nf3 e6 11.de6 fe6 12.Nbd2 Kb8 13.Rc1 Bd6 14.g3 h6 15.Nc4 e5 16.Bh3 Rhe8 17.Qd2 b6 18.Bc3 Bf7 19.0–0 (Better is 19.Bf5+/–) 19...Bc4=+ 20.dc4 Ne4 21.Qe3 Nc3 22.Qc3 e4 23.Nd2 Be5 24.Qc2 Nf6 25.Bg2 (< 25.Ne4 Ne4 26.Qe4 Bb2–/+) 25...Rd4 26.Ne4 Ne4 27.Be4 Bg3 28.fg3 Rde4 29.Qd3 Qb7 30.Rc2 Qe7 31.Rcf2 Qe5 32.Rf4 Qd4 33.Qd4 cd4 34.Re4 Re4 35.Rf4 Rf4 36.gf4 Kc7 37.Kf2 Kd6 38.Ke2 g6 39.Kd3 Kc5 40.h3 g5 41.f5 h5 42.f6 Kd6 43.c5! bc5 44.f7 Ke7 45.b6 g4 46.hg4 hg4 47.b7 Kf7 48.b8Q Ke6 49.Qf4 (49...g3 50.Qe4 Kd6 51.Kc4+–) 1–0. Van Splunter,Arjen – Broekmeulen,Jasper, NED–ch U14 op, 2000.

4.Nf3 Nf6 5.e3 e6 6.Bb2 c6 7.h3 Nbd7 8.Nd4 Bg6 9.bc6 bc6 10.Nc6 Qb6 11.Bb5 Rc8 12.Bf6 gf6 13.Nd4 e5 14.Ne2 Bc2 (14...Rc2 15.Nbc3 Qd6 16.e4 Rc3 17.Nc3 de4 18.Qe2+/–) 15.Qc1 Qb7 16.Nbc3 Bf5 17.d4 Bb4 18.Qb2 0–0 19.0–0 Nb6 20.Rfc1 Nc4 21.Qb3 Be6 22.Na2 Nd6 (Better is 22...Nd2!? 23.Qb2 Nc4 24.Bc4 dc4 25.de5 fe5 26.Qe5 Qe7+/–) 23.Nb4+/– Nb5 24.Nd3 Nd6 25.Qb7 Nb7 26.Rc8 Rc8 27.de5 Bf5 28.Ndf4 fe5 29.Nd5 Kg7? 30.Ne7+– Bh3 31.gh3 Rc2 32.Kf1 Kf6 33.Nd5 Ke6 34.Rd1 Rc4 35.Ndc3 Nc5 36.Ra1 Nb3 37.Ra3 Nd2 38.Ke1 Nf3 39.Kd1 Rh4 40.Rb3 Rh3 41.Rb6 Kf5 42.Ng3 Kg4 43.Rf6 Ng5 44.Nce2 h5 45.Nf5 Rh1 46.Kc2 Rf1 47.Nh6 Kh4 48.Nf7 Ne4 49.Rf5 Rf2 50.Rf2 Nf2 51.Ne5 Ng4 52.Ng4 Kg4 53.Kd3 h4 54.Nf4 Kf5 55.Kd4 Kg4 56.Ke4 Kg5 57.Kf3 Kf5 58.Ng2 h3 59.Nh4 Kg5 60.Kg3 h2 61.Nf3 Kf5 62.Nh2 Ke4 63.Kf2 Kd5 64.Kf3 Kc4 65.Kf4 Kb4 66.e4 Ka4 67.e5 Kb5 68.Nf3 a4 69.Nd4 Kc5 70.Nc2 Kc4 71.e6 Kc3 72.Na3 Kb4 73.Nb5! Kb5 74.e7 Kb4 75.e8Q (75...a3 76.Qe6+–) 1–0. Pinto Fernandez,Silvio – Ventas Cosano,David, Alameda de Osuna op 6th, 2000.

3.a4 Nf6

4.Bb2 b6 5.e3 Bb7 6.c4 dc4 7.Nf3 e6 8.Bc4 Bd6 9.0–0 0–0 10.h3 c5 11.Be2 Qc7 (11...Nbd7 12.Na3=) 12.d4 Nbd7 13.dc5 Bc5 (13...Qc5? 14.Ba3 Bf3 15.Bc5 (15.Bf3?! Qe5 16.Bd6 Qa1+=) 15...Be2 16.Qe2 (16.Bd6?! Bd1 17.Rd1 Rfc8=) 16...Nc5 17.Nd2+–; 13...bc5?! 14.Nbd2=; 13...Nc5?! 14.Bf6 gf6 15.Nd4=) 14.Nd4 (14.Nbd2 Rfd8=) 14...Rad8 15.Bf3 (15.Nd2 e5 16.N4b3 Bb4=+) 15...Nb8 (15...Bd4 16.ed4 Ne5 17.Bb7 Qb7 18.Nd2=+) 16.Bb7= Qb7 17.Qf3 Bd4?? (better 17...Qf3 18.Nf3 Ne4=) 18.Qb7+– (18.Bd4?! Qf3 19.gf3 Nbd7=) 18...Bb2 19.Ra2 Be5 20.Qb6 Nbd7 21.Qa5 Nc5 22.Nd2 (22.Qb4 Rd5+–) 22...Nd3 (22...Nd5 23.b6 Nb7 24.Qb5+–) 23.Nf3 Bb8 (23...Ra8 24.Qd2 Rfd8 25.Rd1+–) 24.Qc3 (24.Rd1 Rd7+–) 24...Ba7 (24...e5 25.a5+–) 25.Rd2 (better 25.a5 Ne4 26.Qc4 Ndc5+–) 25...e5 (25...Ne4 26.Qc6 Nd2 27.Nd2 Rd5+–) 26.Rd3 e4 (26...Rd3 27.Qd3 e4 28.Qc2 ef3 29.a5+–) 27.Rd8 Rd8 28.Ne5 h6 29.Qc4 (29.Qc7 Ra8 30.Qb7 Re8 31.Qf7 Kh8+–) 29...Bb8 30.Qf7 Kh7 31.Qg6 Kh8 32.Nf7 Kg8 33.Nd8 Bd6 34.Ne6 Bf8 (34...Ne8 35.Qe8 Kh7 36.Qf7 Be5 37.Nf8 Kh8 38.Ng6 Kh7 39.Ne7 Bh2 40.Kh2 h5 41.Qh5) 35.Rc1 Ne8 (35...Nh7 36.Rc8 Nf6 37.Rf8) 36.Rc8 Nd6 (36...h5 37.Re8 h4 38.Rf8) 37.Rf8 1–0. RichardSommer (1955) – Faheem7 (1945), lichess.org, 2020.

4.Bb2 c6 5.e3 e6 (--> 1.b4 e6 2.Bb2 Nf6 3.b5 c6 4.a4 d5 5.e3 a5).

4.Bb2 c6 5.e3 Bf5 6.c4 (6.Nf3 e6=) 6...e6 7.h3 Nbd7 (7...Bd6 8.d4+=) 8.Nf3 Bb4 (8...dc4 9.Bc4 Bd6 10.d3=) 9.Nd4 (9.bc6 bc6 10.Nd4 Bb1 11.Rb1 Ne4=) 9...Bb1 10.bc6 bc6 (10...Be4 11.cd7 Nd7 12.Nc2 Bc2 13.Qc2=) 11.Nc6 Black creates threats along the open b–file (11.Rb1 Ne4 12.Nf3 0–0=) 11...Qc7 12.Nb4 Bg6 (12...Be4 13.Nc2 dc4 14.Na3=) 13.Nc2 (13.Na2 dc4 14.Rc1 Qb7 15.Bf6 Nf6 16.Rc4 0–0=) 13...dc4 (13...Rb8 14.Bf6 Nf6 15.Rc1+=) 14.Na3+= 0–0 (better is 14...Bd3 15.Rc1 Bf1 16.Kf1 Nb6+=) 15.Bc4 (better is 15.Rc1+/–) 15...Qb7+= 16.Qb3 (better is 16.Nb5 Qg2 17.Rf1+=) 16...Qg2–+ Black threatens strongly Nc5 17.0–0–0 (17.Rf1 Nc5 (17...Qh3?! 18.Nb5–/+) 18.Qb5 Nfd7–+) 17...Rfc8 18.Bc3 (18.Rdg1 Qf2 19.Rf1 Qg3–+) 18...Rab8 19.Nb5 Nc5 (19...Nc5 20.Qa3 Nd3 21.Bd3 Bd3–+; 19...Qf2?! 20.Rdf1 Qh4 21.d3–+) 0–1. Schiller,W – Olej,Emil, corr ICCF, 1972.

3.Bb2 Qd6

4.e3 Nd7 5.Nf3 =.

4.e3 e5 5.Ba3 (5.d4 Nd7=) 5...Qg6 (5...Qf6 6.Bf8 Kf8 7.d4=) 6.Bf8 Kf8 7.Nc3 (7.d4 Bg4 8.f3 Be6+=) 7...Nf6 8.h4 (8.Nf3!? Nbd7 9.Ne2=) 8...Bg4=+ 9.f3 (9.Nge2 d4 10.Na4 de3 11.de3 Nbd7=+) 9...Bf5–/+ 10.g4 Bc2 11.Qc1 h5 (11...d4 12.ed4 ed4 13.Nce2=+) 12.g5 (12.e4 d4 13.Qc2 dc3 14.Qc3 hg4 15.Qc5 Kg8 16.Qc7 gf3 17.Qb7 Qg3 18.Kd1 f2=) 12...d4=+ 13.e4 (13.ed4 ed4 14.Nce2 Nd5 15.Nd4 Nb4=+) 13...dc3 14.Qc2 cd2 15.Qd2 Nfd7 16.Rd1 (16.Rc1 Qb6=+) 16...Qb6 (16...Ke7 17.Qc2 c6 18.Nh3–/+) 17.Bh3 (17.Bc4 Ke8=+) 17...Ke7–/+ 18.Bd7 (18.g6 Qg6 19.Bd7 Qg3 20.Kf1 Rd8–/+) 18...Rd8 19.Qc3 Nd7 20.a4 (20.Ne2 Qb5 21.Qc7 Rac8 22.Qd6 Ke8–+) 20...c6–+ 21.bc6 Qc6 22.Ne2 Qa4 23.0–0 Rac8 24.Qb2? Rc2 25.Rd7 Kd7 26.Qe5 Re2 27.Rc1 Rc2 28.Rd1 Kc8 29.Qf5 Rd7 (30.g6 Rcc7–+) 0–1. Vogel,Wolfgang – Risch,Herbert, M214D BdF, 1997.

4.e3 Qe6 5.Be2+– Qd7 (5...Qg6!?+–) 6.Nf3 g6?? (better 6...Nf6+–) 7.Bh8+– b6 (7...f6 8.c4 Nh6 9.Nc3+–) 8.0–0 (better 8.Be5 Nf6+–) 8...c6 (8...f6 9.c4 Nh6 10.Nd4+–) 9.Nd4 (9.c4!? e6+–) 9...Bb7 (9...c5 10.Nf3 f6 11.d4+–) 10.bc6 Bc6 (10...Nc6 11.Nc3 Nf6 12.Bb5+–) 11.Bg4 (11.Nc3!? e6+–) 11...Qg4 (11...e6+–) 12.Qg4 (12.Qg4 e6 13.Nc3+–) 1–0. Atotheking (1725) – imstraightpog (1655), lichess.org, 2021.

4.e3 Nf6 5.Nf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Ne5 Nbd7 9.Ng6 hg6 10.Nc3 e6 11.Bg2 g5 12.Qe2 0–0–0 13.0–0–0 Rh4 14.f3 Be7 15.d3 Rdh8 16.Qf1 Qc5 17.d4 Qa7 18.e4 Nb6 19.Qe2 a4 20.a3 Re8 21.ed5 Nfd5 22.Nd5 Nd5 23.Qe5 Bf6 24.Qe1 Qb6 25.Bf1 Rd8 26.Qe4 Kb8 27.c4 Nf4 28.Rd2 Qa5 29.Kc2 Rd7 30.Rhh2 g6 31.Rd1 Bg7 32.Qe3 Qa7 33.Rh1 Rd8 34.Qd2 Kc8 35.Qb4 Bf6 (35...Bd4?? 36.Bd4 Qd4 37.Rd4 Rd4 38.b6+–) 36.Qd2 c5 37.bc6 bc6 38.Qe3 e5 39.Qe4 Qb7 40.d5 Qb3 41.Kc1 Rd6 42.Rh2 Bg7 43.Rc2 f5 44.Qe1 (44.gf5 Nd5! (< 44...cd5 45.cd5 Kd8 46.Rc6+/–) 45.cd5 Re4 46.fe4 Qe3 47.Kb1 gf5 48.ef5 Qf3–+) 44...Rh8 45.dc6 (< 45.Be5 Qa3 46.Kb1 Re8–/+) 45...Rd1 46.Qd1 Rd8 47.Rd2 Qd1 48.Rd1 Rd2?? ( 48...Rd1 49.Kd1 Kc7=) 49.Rd2+– (49…Bh8 50.c5+–) 1–0. Bonetti,Shane – VIIX, ICC, 2002.

3.Bb2 Qd7

4.a4 c5 5.e3 c4 (5...Qd6 6.Nf3=) 6.Nf3+= Qd6 7.Be5 Qc5 8.d4 (8.d3 cd3 9.cd3 Nd7+=) 8...Qb4= 9.c3 Qb2 10.Na3 (better 10.Nbd2!? Qc3 11.e4=) 10...Qc3–/+ 11.Nd2 h5 (11...Bg4! 12.Qc1 Qc1 13.Rc1 Nd7–/+) 12.Be2=+ Bg4 (12...e6 13.Nac4 dc4 14.Rc1=) 13.f3 (13.Bg4 hg4 14.b6 Na6=) 13...Be6 (better 13...Bc8 14.e4 e6=+) 14.0–0 (14.e4 f6 15.Bg3 h4+=) 14...Nd7 (14...Qe3 15.Rf2 Nd7 16.Nc2–+) 15.Bg3? (better 15.Bf4 Qb2 16.Rf2=) 15...Qe3–+ 16.Bf2 Qc3?? (better 16...Qg5 17.Nc2 Bf5–+) 17.b6+= Nb6 18.Nb5 Qa1? (better 18...Qb4 19.Be1 c3+–) 19.Qa1+– g5 (19...Kd8 20.Bg3 Rc8+–) 20.Nc7 Kd7 21.Na8 Na8 22.Nc4! b6 (22...dc4 23.d5 Combination) 23.Ne5 Ke8 24.Bb5 Bd7 (24...Kd8 25.Qc3 Rh7 26.Qc6 Nc7 27.Rc1 Nb5 28.Qa8 Bc8 29.Rc8) 25.Bd7 Kd8 26.Qc1 (26.Qc3 Nc7 27.Rc1 e6 28.Qc7 Ke7 29.Bc6 Kf6 30.Qf7) 26...e6 27.Qc8 Ke7 28.Qe8 Kd6 29.Qf8 (29.Nf7 Kc7 30.Qc8) 29...Kc7 (29...Ne7 30.Qh8 Kc7 31.Qa8 Nc8 32.Qc8 Kd6 33.Qd8 b5 34.Bb5) 30.Rc1 Kb7 31.Qc8 Ka7 32.Nc6 1–0. Trkn – shred, itsyourturn.com, 2000.

4.e3 c6 5.bc6 White terminates the opponent with strong threats 5...Qc6 (5...Nc6 6.Nf3=) 6.Nc3 Qb6 (6...Qd6!?+=) 7.Nd5+– Qb2? (better 7...Qd6 8.e4 e6+–) 8.Nc7+– Kd7 (8...Kd8 9.Na8 Nc6 10.a3+–) 9.Na8 Qb4 (9...Kd8 10.Nf3+–) 10.Rb1 Qa3 (10...Qe4+–) 11.Nb6 (11.Nb6 Kd8 12.Nc8 Kc8 13.Qf3+–; better 11.Rb3 Qc5 12.Rd3 Ke6+–) 1–0. Wall,Bill – Murray B, internet, 2001.

4.e3 Qd6 5.a4 (5.Nf3 Nd7=) 5...Be6 (5...Nd7 6.c4=) 6.Ba3 Qe5 (6...Qb6 7.d4 Nd7 8.Bd3+=) 7.Nc3 (better 7.d4 Qf6 8.Nd2+=) 7...d4? (better 7...Nf6!?+=) 8.Nf3+– Qf6 9.Nd4 Qg6 (9...Nd7 10.Qf3 Qf3 11.gf3+–) 10.Qf3 Ra7?? (10...c6+–) 11.b6! cb6 12.Ncb5 Bg4 13.Qg3 Bd7 (13...Na6 14.Na7 Bd7+–) 14.Qb8 (14.Qb8 Bc8 15.Qc8) 1–0. Anonymous – Anonymous, lichess.org, 2020.

4.e3 f6 5.c4+– dc4 6.Nc3 Nh6 7.Bc4 Nf5 (7...Qg4 8.Be2 Qg2 9.Bf3+–) 8.Nf3 Nd6 9.Be2 b6 (9...e6 10.Qc2+–) 10.Qb3 (10.0–0 Bb7+–) 10...Bb7 11.0–0 e6 (11...e5 12.d4 ed4 13.Nd4+–) 12.Nd4 Kf7 (12...e5 13.Ne6 Ke7 14.Nf8 Kf8 15.Ba3+–) 13.Bg4 Kg6? (13...f5 14.Nf5 Nf5 15.Bf5 a4+–) 14.Be6 Qe7 (14...Qe8 15.Nd5 c5+–) 15.Ba3 h6 (15...f5 16.Nce2 c5 17.bc6 Nc6 18.Nf4 Kh6 19.Nf5 Nf5 20.Be7 Nfe7+–) 16.Qc2 Kh5 17.Bg4!! Kg5 (17...Kg4 18.Qg6) 18.f4 Kg4 19.Qg6 Kh4 20.g3 Kh3 21.Qh5 1–0. Janek – Mittdel, internet, 2018.

3.Bb2 e5

4.Be5 d4 5.Nf3+– d3 (5...Bg4!?+–) 6.e3 (6.ed3 Nd7 7.d4 Ne5 8.de5 Ne7+–) 6...dc2 (6...Nd7 7.Bd4 dc2 8.Qc2 Ngf6+–) 7.Qc2 c6 (7...Nf6 8.Bc7 Bf5 9.Qc4+–) 8.Bc4 (8.Nc3 Nf6+–) 8...Be6 (8...cb5 9.Bb5 Nc6 10.Qe4+–) 9.Be6 fe6 10.0–0 (10.Qc4 Qd5 11.Qf4 Nd7+–) 10...Nf6 (10...cb5 11.Nc3 Nc6 12.Qb3+–) 11.Ng5 (11.Nd4 Qd7 12.Nc3 c5+–) 11...Nd5 (11...Qd7 12.Nc3 Bb4 13.Qb3 Bc3 14.dc3+– (worse 14.Qc3 Nd5 15.Qb3 a4+–)) 12.Ne6 Qd7 13.Qf5 (better 13.Nf8 Kf8 14.Nc3 Nc3 15.dc3+– (15.Bc3?! cb5 16.a3 Na6+–; 15.Qc3?! cb5 16.Rab1 b4 17.Qc5 Kf7 18.Qc4 Ke8+–)) 13...Ne3 (13...Ke7 14.Bg7 Bg7 15.Ng7 Qf5 16.Nf5 Kf6+–) 14.fe3 Bd6 15.Bd6 Qd6 (15...Qe7 16.Ng7! Kd8 17.Be7 Kc7 18.Ne6 Kc8 19.Qf4 Na6 20.ba6 Kd7 21.Qd6 Kc8 22.Qc7) 16.Qf7 1–0. GuestKPLB – GuestRLXD, freechess.org, 2020.

4.Be5 Nd7 5.Bb2 Nb6 6.e3 Nf6 7.a4 Bd6 8.Nf3 0–0 9.Be2 Ne4 10.0–0 Nc5 11.d4 (better 11.Nc3!?+–) 11...Nca4= 12.Ba3 Bf5 13.Bd6 Qd6 14.c4 (14.Ra2 Rfe8=) 14...Nb2 (better 14...dc4!? 15.Ne5 c3–/+) 15.c5+= Qe7 (15...Qg6 16.Qc1 N6c4+–) 16.Qb3+– N6c4 17.Nc3 c6 (17...Qe6 18.Ra2 Nd3 19.e4+–) 18.b6 (18.Ra2 Nd3 19.Bd3 Bd3 20.Nd5 cd5 21.Qd3 Qd7+–) 18...Bd3 (18...Bg4 19.Rfe1+=) 19.Bd3+– Nd3 20.Nd5! cd5 21.Qd3 a4 22.Nd2 Nd2 23.Qd2 Rfe8 24.Qb4 Qd7 25.Ra3 f5 (better 25...Ra6+–) 26.Rfa1 f4 27.Ra4 Ra4 28.Qa4 Qa4 (28...Qe6 29.Re1+–) 29.Ra4 Kf7 (29...fe3 30.fe3 Rb8+–) 30.Ra7 Re7 (30...Kf6 31.Rb7 fe3 32.fe3 Re3 33.c6+–) 31.h3 (better 31.c6 fe3 32.fe3+–) 31...fe3 32.fe3 Kf6 33.c6! Re5 (33...bc6 A pinning theme 34.Re7) 34.c7 (better 34.de5 Ke5 35.cb7+–) 34...Re8 35.Rb7 Rc8 36.Rb8 Kg5 37.Rc8 g6 (37...Kh5 38.Rd8 Kg6 39.c8Q Kh6 40.Rd6 g6 41.Qf8 Kh5 42.Qf4 h6 43.Qg4) 38.Rf8 h6 (38...Kh4 39.c8Q Kh5 40.Qg4 Kh6 41.Rg8 g5 42.Qg5) 39.c8Q h5 40.Qd8 Kh6 41.Rh8 Kg7 42.Qf8 1–0. BeepBeepImAJeep (2655) – brix1317 (1710), lichess.org, 2017.

4.Be5 Nf6 5.Bb2 Bd6 6.e3 0–0 7.c4 dc4 (7...Be6 8.Nf3=) 8.a4 (8.Bc4 Be6 9.Be6 fe6+=) 8...Bf5 9.Bc4 Nbd7 10.Nf3 Ne4 (10...c6 11.0–0+=) 11.Be2 Ndf6 12.0–0 Re8 13.d3 Nc5 14.Nc3 (14.e4 Qe7+–) 14...Be6 (better 14...Nd3!? 15.Qb1 Bg6=) 15.Nd4+– Bc8 16.Bf3 Ne6 (16...Rb8 17.Rc1+–) 17.Ne6 Re6 18.d4 Re8 19.Qc2 Rb8 (19...Ng4 20.g3+–) 20.Ra2 (20.e4 Bf4+–) 20...Bg4 21.Bg4 Ng4 Do you see the mate threat? 22.h3 Nh2 (22...Nf6 23.Ba3+–) 23.Rc1+– Qg5 24.Ne4 Qg6? (better 24...Nf3 25.Kh1 Qd5 26.Nd6 Nh4+–) 25.Nd6+– Qd6 (25...Nf3 26.Kh1 Qd6 27.gf3+–) 26.Ba3 Nf3 27.gf3 Qh6 (27...Qe6 28.Kg2+–) 28.Qf5 Re6 (28...c6 29.bc6 bc6 30.Rb2 (worse 30.Qa5 Qh3 31.Qc7 Qf3+–) 30...Rb2 31.Bb2+–) 29.Kh2 (better 29.Rc7!? Kh8+–) 29...Rf6 (29...c6 30.bc6 Rc6 31.Rac2 Rc2 32.Rc2+–) 30.Qe4 (30.Qd7!? c6+–) 30...Re6 31.Qf4 Qf4 32.ef4 Rf6 (32...c6 33.bc6 Rc6 34.Rc6 bc6 35.Rc2+–) 33.Rc7 Rf4 (33...h6 34.Rd2 Rf4 35.d5+–) 34.Rac2 (34.Bc5 g5 35.Ba7 Ra8 36.Rb7 Rf3+–) 34...g5 (34...h6 35.Rd7+–) 35.Rc8 (better 35.Bd6!? Rf3 36.Kg2 Rf5+–) 35...Rc8 36.Rc8 Kg7 37.Kg3 Rd4 (37...h5+–) 38.Bb2 (38.Bb2 Kf6 39.Bd4 Ke6 40.Rc7+–) 1–0. BeepBeepImAJeep (2525) – Suckouttt (2260), lichess.org, 2017.

3.Bb2 f6

4.c4 dc4 5.e3 Be6 (5...Nd7 6.Bc4 Nb6 7.Be2+=) 6.Qc2 (6.Na3 Nh6+–) 6...Nd7+= 7.Bc4 (7.Nh3 Nh6 8.Nf4 Bf5=) 7...Bc4 8.Qc4 Nb6 9.Qe2 (9.Qe4 Qd5 10.Nc3 Qe4 11.Ne4 Nc4+=) 9...e5= 10.Nc3 a4 (10...Bb4 11.Nf3=) 11.a3 (11.Rd1 a3 12.Ba1 Bb4+=) 11...Bd6 12.Nf3 Qe7 13.d4 (13.0–0 Nh6+=) 13...e4= 14.Nd2 f5 15.0–0 (15.g4!?+=) 15...Nf6=+ 16.f4 (16.f3 ef3 17.Rf3 0–0=+) 16...ef3 (16...Qf7 17.Rac1=+) 17.Rf3 0–0–0?? (better 17...0–0=+) 18.Rf5+– h5 (18...Rhe8 19.e4 Qe6 20.Rf3+–) 19.e4+– Ng4 (19...Qd7+–) 20.Nf1 (better 20.h3 Bh2 21.Kh1+–) 20...g6+– 21.Rf3 Rdf8 (21...Rhf8 22.Nd1 Nd5 23.g3+–) 22.Nd1 (22.h3 Rf3 23.gf3 Nh6+–) 22...h4?? (better 22...Qg5 23.Rf8 Rf8+–) 23.Rf8+– (23.Rf8 Rf8 24.Qg4 Qd7 25.Qd7 Kd7 26.Nfe3+–) 1–0. GuestXJBP – GuestYSLZ, freechess.org, 2020.

4.d4 c5 5.dc5 e5 6.e3 (6.Ba3 Be6+=) 6...Bc5= 7.c4 Ne7 8.Nf3 Be6 9.Nbd2 0–0 10.Be2 Nd7 11.0–0 Nb6 (11...a4 12.Bd3+=) 12.Nb3 Qd6 13.cd5 Ned5 14.Nc5 Qc5 15.Rc1 Qe7 (15...Qb4 16.Qd2=) 16.Nd2 (16.a3 Rac8=) 16...a4 17.a3 Rac8 18.Bd3 Rc1 19.Qc1 Nc7 20.Ne4 (20.f4 Qd7 21.Qb1 A) 21...Nb5? 22.fe5 (22.Bh7?! Kh8 23.Bd3 Rd8 24.Bb5 Qb5+=) 22...Nd5 23.Bh7 Kh8 24.Bc2+–; B) 21...Rd8 22.Bh7 Kh8 23.fe5 f5+/–) 20...Rd8 (20...Rc8 21.Qc5 Qc5 22.Nc5=) 21.Qc2 (21.Rd1 Nc4=) 21...Bb3 22.Qe2 f5 (22...Ne6 23.Rb1+=) 23.Nd2= e4 24.Bb1 Rd5 (24...Be6!?+=) 25.f3+= ef3 26.Rf3 Qd7 The pressure on b5 grows 27.Rf2 Qb5 28.Qh5 Can f5 get defended? (better is 28.Qb5 Rb5 29.Bd3+=) 28...Bc2–/+ 29.Bc2 Qb2 30.Nf3?? (better is 30.Nf1 g6 31.Qf3 Qa3 32.g4+=) 30...g6–+ 31.Qg5 Qc1 (31...Qc1 32.Rf1 Qc2–+) 0–1. Sanhueza Rivas,Juan – Buj,Pablo, PER jub15 corr8891, 1988.

4.e3 e5 (--> 1.b4 e5 2.Bb2 f6 3.b5 d5 4.e3 a5).

4.e3 Be6 5.d4 Bf7 6.Nf3 e6 7.Nbd2 a4 8.a3 c6 9.c4 dc4 10.Bc4 Ne7 11.0–0 Nd5 12.Ne4 Nd7 13.Nc3 Bd6 14.Na4 cb5 15.Bb5 0–0 16.Nc3 N7b6 17.Ne4 Be7 18.Qb3 Kh8 19.Rfc1 Bg6 20.Nc5 Bc5 21.Rc5 Nd7 22.Rcc1 Rc8 23.Rc8 Qc8 24.Rc1 Qd8 25.h3 N7b6 26.a4 Qd6 27.Ba3 Qd8 28.Bf8 Qf8 29.g3 Be4 30.Nd2 Bf5 31.e4 Bh3 32.ed5 ed5 33.Bf1 Be6 34.Qb6 1–0. barborski – valdutpopa (1700), kurnik, 2012.

3.Bb2 Nf6

(--> 1.b4 a5 2.b5 Nf6 3.Bb2 d5).

4.e3 c6 (--> 1.b4 c6 2.e3 a5 3.b5 d5 4.Bb2 Nf6).

4.e3 e6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 a5).

4.e3 e6 5.Nf3 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3).

4.e3 e6 5.Nf3 c5 (no 6.bc6) (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c5 5.Nf3 a5).

4.Nf3 Nbd7 5.e3 e6 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3 Nbd7).

4.Nf3 e6 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5).

4.Nf3 e6 5.e3 Nbd7 6.c4 c5 (--> 3.Bb2 c5 4.e3 e6 5.c4 Nf6 6.Nf3 Nbd7).

3.Bb2 Bg4

4.Qc1 c5 (4...Nf6 5.h3 Bf5 6.Nf3=) 5.e3 Nd7 6.c4 e6 7.Ne2 Bf5 8.Ng3 Bg6 9.Be2 (9.h4 h5 10.cd5 ed5+=) 9...Nb6 (better is 9...h5!? 10.cd5 ed5+=) 10.cd5+= ed5 11.0–0 (11.f4!? Nh6 12.0–0+=) 11...h5= 12.f4 h4 13.f5 (better is 13.Nh1!?+=) 13...hg3–/+ 14.fg6 gh2 15.Kh1 Nf6 (15...f6!?–/+) 16.Bf6+= gf6 17.gf7 (17.Qc2 Qd6+=) 17...Kf7–/+ 18.Nc3 Qe7 (18...Bd6 19.Qd1 Ke7 20.Bh5–/+) 19.Bf3 Rd8 20.Qc2 Qe6 21.Rf2 (21.e4 d4 22.Nd5 Nd5 23.ed5 Qd7+=) 21...Bd6 22.Raf1 Rh6 23.Be2 Kg7 24.Rf5 Be5 25.Bg4 Qd6 26.Rh5–/+ Rdh8 27.Qf5 Bc3 28.dc3 Rh5 29.Bh5= Rh6 30.Bf3 Qe5–/+ 31.Qe5? fe5–+ 32.Rd1 e4 33.Bg4 Kf6 34.Bh3 Ke5 35.Kh2 Nc4 36.Re1 Na3 37.Kg3 Nb5 38.Rb1?! Nc3 39.Rb7 d4 40.ed4 cd4 41.Re7 Kd5 42.Kf4 Kc4 43.Rc7 Kd3 44.Bf5 Nd5 45.Kg5 Rh2 46.Ra7 Rg2 47.Kh4 Ra2 0–1. Konijn,Piet – Claesen,P (2345), Leuven BEL, 2012.

4.c4 e6 5.h3 Bf5 6.Nc3 d4 (6...Nf6 7.Nf3=) 7.Na4+= e5 8.Nf3 Nd7 9.g3 Ngf6 10.Bg2 Bd6 11.0–0 0–0 12.g4 Bg6 13.e3 Bd3 (13...de3 14.de3 Ne4 15.c5 Nec5 16.Nc5 Nc5 17.Ne5+=) 14.ed4 Bf1 15.Kf1 ed4 16.Nd4 Rb8 (16...Nc5 17.Nf5 Nd3 18.Bb7 Nb2 19.Nb2=) 17.g5+= Ne8 18.h4 Bh2 (18...h6 19.Qh5 Bf4 20.Bb7 A) 20...Rb7? 21.Nc6 Ndf6 A1) 22.gf6?! Qd3 (22...Qd2?? 23.fg7 Ng7 24.Qg4+–) 23.Kg2 Bd6+/–; A2) 22.Nd8 Nh5 23.Nb7+–; B) 20...Ne5+=) 19.Qc2 White plans c5 (19.Qb3 Be5 20.Qd3 Bf4+/–) 19...Ne5 20.c5 (20.Nf3 Nf3 21.Bf3 c6+=) 20...Qd7+= 21.Re1 Rd8 (21...Ng6 22.Qf5 Qf5 23.Nf5+=) 22.Qb3 (22.Bb7?! Qg4=) 22...Qc8 (22...g6 23.Re4 (23.Bb7?! Qg4=) 23...Ng7 24.Bh3+–) 23.Bh3 (23.Re4 c6+–) 23...Qb8 24.Re4 c6 25.bc6 Nc6 26.Nf3 (26.Nb6 Nd4 27.Bd4 Qc7+/–) 26...Nb4 27.Bc3 (27.Bd4 b5 28.Nc3 Nc6 29.Nb5 Nc7+–) 27...Rd3 (27...Nd5 28.Nb6 Nb6 29.cb6+– (worse is 29.Ba5 Nd7 30.d4 b6 31.cb6 Qb7–/+)) 28.Kg2 Bc7 29.Nb2 b5 (29...b6 30.Nd3 Nd3 31.c6+–) 30.Nd4 Rh3 31.Kh3 Qb7 (31...Qa8 32.f3 Nd5 33.Nd3+– (33.Qb5?! f5 34.Re3 Ne3 35.de3 Qd5+–)) 32.f3 Na2 (32...Nd5 33.Nd3 (33.Nb5?! Nf4 34.Rf4 Bf4+=) 33...b4 34.Ba1 Qc8 35.Kg2+–) 33.Qa2 b4 34.Na4 bc3 35.Nc3 Qc8 (35...h6 36.g6 Bb8 37.Nd5 fg6 38.c6 Qc8 39.Kg2+–) 36.Kg2 Bd8 37.Qa4 Nc7 38.c6 (38.Qa5?! Ne6 39.Qb5 Nc5+–) 38...Qa6 39.Nde2 (39.Ncb5 Nb5 40.Qb5 Qb5 41.Nb5 f6+–) 39...f6 40.f4 Rf7 (40...fg5 41.hg5 h6 42.gh6 gh6 43.Rd4+–) 41.d4 (better is 41.Nd4!? Qd3 42.Ndb5 Rf8 43.Qb3 Kh8+–) 41...Be7 42.d5 Bb4 43.Qd1 Qc8 44.Qd3 Qg4? (44...Bd6+–) 45.Ng3 f5 (45...Bd6 46.f5 Qg3 47.Qg3 Bg3 48.Kg3 fg5+–) 46.Rb4 ab4 47.Nce2 h5 (47...h6 48.d6 Kh7+–) 48.d6 (48.d6 Kh7 49.d7 Rd7 50.cd7+–) 1–0. marekt (2190) – decu40 (1910), gameknot.com, 2015.

4.h3 Bh5 5.Nf3 Nf6 6.g4 Bg6 7.g5 Nh5 8.e3 e6 9.Rg1 a4 (9...Bd6 10.Be2 h6 11.Nh4 hg5 12.Ng6 fg6 13.Bd3+/–) 10.Be2 a3 11.Bc3 c5 (11...h6 12.Ne5 hg5 13.Ng6 fg6 14.Bd3+=) 12.bc6!+– bc6 (12...bc6 13.Nd4 Combination; 12...Nc6 13.Nd4 Decoy) 13.Ne5 d4 14.Bd4 Nf4 15.Bf1 (15.ef4?! Qd4 16.Nc3 Qf4+=) 15...Bh5 16.Ng4 Nd5 17.Nc3 Qg5 (17...Nb4 18.Rb1 Nd7 19.Bg7 Bg7 20.Rb4 Qg5 21.Qf3 Bc3 22.dc3+/–) 18.Qb1 Qe7 19.Nd5 ed5 20.Qb6 f6 21.Be2 Bg6 22.h4 Qf7 (22...Kf7 23.h5! Bc2 24.h6+–) 23.c4 dc4 (23...Bf5 24.h5 dc4 25.Bf3+–) 24.Bf3 Bd6 25.h5 Bh5 26.Nf6! (26.Bc6 Nc6 27.Qc6 Ke7+/–) 26...gf6 27.Bh5 Qh5 28.Bf6 Qh2 (28...Qa5 29.Qd4 Qd5 30.Bh8 Na6+–) 29.Qd8 Kf7 30.Rg7 Ke6 31.Qh8 Qh1 32.Ke2 Qh5 33.Kf1 Qh3 34.Rg2 Ra7 35.Bc3 Qh1 (35...Rf7 36.Qe8 Re7 37.Qc8 Nd7 38.Kg1+–) 36.Rg1 Qf3 (36...Qh3 37.Ke2 Qf5 38.f4+–) 37.Qc8 Rd7 38.Rg5 Bc7 39.Rb1 Qh1 40.Rg1 Qf3 41.Ke1 (41.Rb8?! Qd1 42.Kg2 Qg4 43.Kf1 Qd1 44.Kg2 Qg4 45.Kf1 Qd1=) 41...Bh2 (41...Kd6 42.Rb8 Rf7 43.Bb4 c5 44.Qa6 Kd7 45.Qb5 Qc6 46.Qc4+–) 42.Rb8 Bg1 43.Qg8 Rf7 44.Qg1 Qh3 (44...Rf8 45.Rf8 Qf8 46.Qh1+–) 45.Rb4 c5 46.Rb6 Kd7 47.Rb7 Ke6 48.Rf7 Kf7 49.Qg7 Ke6 (49...Ke8 50.Qg8 Ke7 51.Qd5+–) 50.Qe5 Kf7 51.Qc7 Ke8 52.Qc5 1–0. housemd (1960) – decu40 (1940), gameknot.com, 2015.

4.h3 Nh6?? 5.hg4+– b6 (5...Ng4 6.e4 Nf6 7.ed5 Nd5+–) 6.Rh6! Kd7 (6...gh6 Exploits the pin 7.Bh8) 7.e4 Qc8 (7...Kc8 8.Qf3 e5 9.Rh1+–) 8.ed5 c6 (8...Qe8 9.Bd3+–) 9.bc6 (better 9.dc6 Kd8+–) 9...Nc6 (9...Ke8 10.Bd3+–) 10.Rc6 e6 11.Rc8 ed5 12.Ra8 Bc5 13.Bb5 Kc7 (13...Kd6 14.Qf3 f5 15.Qf4 Ke7 16.Qc7 Ke6 17.Qd7) 14.Qf3 Re8 (14...Rb8 15.Qf7 Be7 16.Qe7 Kc8 17.Qd7) 15.Re8 Kb7 (15...f6 16.Qd5 Bf2 17.Kf2 a4 18.Qc6) 16.Qf7 Be7 17.Qe7 1–0. DEFFM – francod, freechess.org, 2020.

3.d4 Bd7

4.Nc3 c6 5.Nf3 Nf6 6.Bg5 (6.e3 e6=) 6...cb5=+ 7.Bf6 b4 (7...ef6!? 8.Qd2 Bb4=+) 8.Bg7 (8.Be7!? Be7 9.Nd5+=) 8...Bg7= 9.Nd5 Nc6 (9...Bc6 10.e4=) 10.e4 (10.e3!?+/–) 10...Bg4= 11.Bb5 Bf3 (11...0–0 12.c3=) 12.gf3 (12.Qf3 0–0 (< 12...Bd4 13.Rd1 e5 14.a3+/–) 13.c3 Rc8+=) 12...Kf8 13.Rc1 ( 13.c3 bc3 14.Rc1=+) 13...e5?? ( 13...Nd4 14.Bd3 e6=+) 14.de5+/– Ne5 (14...Qg5 15.c3 Ne5 16.Be2+/– (16.cb4 Qg2 17.Kd2 Bh6 18.f4 Qe4–+)) 15.0–0 (15.f4!? Nc6 16.c4+/–) 15...Rg8 16.Kh1 Qh4 17.c4 (17.Rg1!?+=) 17...Qh3 18.Nf4 Qf3 19.Qf3 Nf3 20.Nd5 Rd8 (20...Nd2 21.Rfe1 b3 22.ab3 Nb3=) 21.c5 (21.Rcd1 Be5 22.h3 Bd6=) 21...Be5 22.Rcd1 Nh2–/+ 23.Rfe1 Ng4 24.Rf1=+ Nf6 25.f4 Bb2 26.Nf6 Bf6 27.Rd8 Bd8–/+ 28.f5 Bf6 29.Rd1 Kg7 30.Bc4 Rd8 31.Bd5 Rd7 32.Kg2 Rc7 33.Rc1 Bc3 34.Kf3 Kf6 35.Rh1=+ ½–½. Vettenburg,Louis – Verkinderen, corr Belgium , 1984.

4.Nc3 Bf5 5.Bg5=.

4.Qd3 c6 5.a4 (5.Nf3 Nf6 6.a4 (6.Nc3 cb5 7.Nb5 Na6 8.a3) 6...g6= 7.Qb3 Bg7 8.Nc3; 5.Nc3 Nf6 6.Nf3 cb5 7.Nb5 Na6 8.a3) 5...b6 (5...Nf6 6.Nf3= g6 7.Qb3 Bg7 8.Nc3) 6.Ba3 (6.Nf3 Nf6+= (6...cb5 7.ab5 Qc8 8.Nbd2) 7.Nc3 g6 8.Ne5; 6.Nc3 Nf6 7.Nf3 g6 8.Ne5) 6...Nh6 (6...Nf6 7.Nf3= cb5 8.ab5; 6...cb5 7.ab5 g6 8.e4) 7.e3 (7.Nc3 g6+= (7...cb5 8.ab5) 8.Nf3; 7.Nd2 cb5 8.ab5) 7...g6 (7...cb5 8.ab5 Bf5 9.Qb3+=) 8.Be2 (8.Nc3+=) 8...Bf5 (8...cb5 9.ab5 Bf5 10.Qb3+=) 9.Qc3 (9.Qb3 e6+–) 9...Qc7 10.bc6 (better 10.Nf3+=) 10...Qc6?? (better 10...Nc6 11.Nf3 Bg7=) 11.Bb5+– Bd7 (11...Qb5 12.ab5 Ra7 13.Nf3+–) 12.Bc6 Nc6 1–0. yidna – bigfrostgiant, gameknot.com, 2018.

4.Qd3 Nf6 5.Nc3= (5.Nf3 g6 6.Bf4 Nh5 7.Bg5 Bf5 8.Qb3; 5.a4 g6 6.Qb3 Bf5 7.Nc3 e6 8.h3) 5...g6 6.e4 de4 7.Ne4 Bg7 8.Nf6.

4.e3 Bf5=.

3.d4 e6

4.a4 Nf6 5.Nf3=+.

4.a4 h6 5.f4 (5.Nf3 Nf6=) 5...Bb4 6.c3 Bd6 7.g3 (7.Nf3 Nd7=+) 7...Nf6 (7...Nd7 8.Nf3=+) 8.Bg2 c6 (8...Nbd7 9.Nf3=+) 9.Qb3 (9.Nf3 0–0=+) 9...Nbd7 (9...cb5 10.ab5 Qb6–/+) 10.h3 (10.Ba3 Qc7=+) 10...Nb6 (10...Nh5 11.Kf2–/+) 11.Nd2 Nh5 (11...cb5 12.Qb5 Bd7–/+) 12.Nf1 (12.Kf2 cb5 13.Qb5 Bd7=+) 12...Nc4 (better 12...cb5 13.Qb5 Bd7–+) 13.Ne3? (better 13.Bf3!? Nf6 14.e4 de4 15.Qc4 ef3 16.Nf3–/+) 13...Ng3 (better 13...Ne3 14.Be3 Ng3 15.Nf3 Nh1 16.Bh1–+) 14.Rh2? (14.Nc4 dc4 15.Qc4 Nh1 16.Bh1 cb5 17.Qb5 Bd7 18.Qb7 Rb8–+) 14...Bf4 (better 14...Ne3!? 15.Be3 Nf5 16.Bf2 Bf4 17.Nf3 cb5 18.Qb5 Bd7 19.Qb3–+) 15.Nc4 dc4 (15...Nf5 16.Bf4 Qh4 17.Kf1 Qf4 18.Nf3 dc4 19.Qa3 cb5 20.Qc1–+) 16.Qb2 (16.Qc4 Ne4! 17.Bf4 Qh4 18.Kd1 Qf4 19.Be4 Qh2 20.Kc2–+) 16...Qg5?? (16...Ne4! 17.Bf4 Qh4 18.Kd1 Qf4 19.Be4 Qh2 20.Nf3–+) 17.h4?? (17.bc6 Bc1 18.Qc1 Ra7=) 17...Qg4?? (better 17...Bc1 18.Qc1 Qc1 19.Rc1 cb5–+) 18.Bf3= Qf5 19.e3? (better 19.bc6 b6 20.c7=) 19...Qd3–+ 20.Be2?? (better 20.Rg2 Qf1 21.Kd2–+) 20...Ne2 21.Re2 Bg3 22.Kf1 Qf5 (worse 22...Bh4 23.Qc2 e5 24.Qd3 cd3 25.Rh2–+) 23.Kg2 Bh4 (23...Qg4!? 24.bc6 bc6 25.Kf1–+) 24.e4 (24.Qc2 Qg5 25.Kh1 Bg3–+) 24...Qg6 (24...Qg4 25.Kh1–+) 25.Kh1 e5! 26.d5 (26.de5 Bg3 Decoy) 26...Bg4 (26...cd5 27.ed5 Bg3 28.Qd2–+) 27.Re3 Qh5 28.Qh2 Bg3 (better 28...0–0–0 29.bc6 bc6–+) 29.Qh5 (29.Rg3 cd5 30.ed5 Rd8 31.Qh5 Bh5 32.Rg7 Rd5=) 29...Bh5 30.Rg3 0–0 (30...cd5 31.ed5 0–0–0 32.Rg7 Rd5 33.Be3=) 31.d6 (31.dc6 bc6 32.b6+–) 31...g6? (31...cb5 32.ab5 Rad8 33.Ba3+=) 32.Ba3 (32.bc6 bc6 33.Nf3 Bf3 34.Rf3 Kg7+–) 32...Rfe8 (32...cb5!? 33.Rb1 ba4+=) 33.b6 (33.bc6 bc6 34.Nf3 Bf3 35.Rf3 Rab8+–) 33...Re6+– 34.Bc5 Rf6 (34...Rd8 35.Nf3+–) 35.Ra2 (better 35.d7 Re6 36.Ra2+–) 35...Rf4?? (better 35...Rd8+–) 36.d7+– Rh4 (36...Rf1 37.Rh2 Kh7+–) 37.Kg2 Re4 (37...Rd8 38.Rd2 Bg4 39.Be7 Rd7 40.Rd7 Bd7 41.Bh4+–) 38.Be7 (38.Be7 f5 39.d8R Rd8 40.Bd8+–) 1–0. patrick317 – tara29, gameknot.com, 2017.

4.Nf3 c5 5.a4 (5.e3 Nf6=) 5...cd4 6.Qd4 Qc7 7.Na3 Nf6 8.Bf4 Qc5 9.Qd3 (9.e3!?=+) 9...Ne4–/+ 10.c4?? ( 10.e3–/+) 10...Nf2–+ (11.Qd2 Nh1–+; 10...Qf2?! 11.Kd1–+) 0–1. sagaz (2370) – huimre (2695), net–chess.com, 2006.

4.Nf3 Nf6=.

3.d4 Bf5

4.Ba3 Nd7 5.Nf3 e6 6.Bf8 Nf8 7.c4 Nf6 8.e3 Ng6 9.Nc3 0–0 10.Rc1 Bg4 (10...Re8 11.Bd3=) 11.Be2 (11.h3 Bf5=) 11...dc4 12.0–0 Bf3 13.Bf3 Nd5 14.Be2 Qh4 (14...Nc3 15.Rc3 Nh4 16.Bc4+/– (16.Rc4?! Qd5 17.f3 Qg5=)) 15.Bc4 c6 16.Nd5 cd5 17.Bd3 Rfc8 18.f4 (18.Qd2 b6+=) 18...f5 19.Rf2 Qd8 20.Rfc2 Ne7 21.Qh5 b6 22.a4 (22.Qh4 Qd6 23.Rc8 Rc8 24.Rc8 Nc8=) 22...Rc2= 23.Rc2 Qd6 24.Rc1 Qa3 25.Qd1 Ra7 26.Kf2 (26.g3 Ra8+=) 26...Kf8 (26...Ra8 27.Rc7+=) 27.Kf3 Kf7 28.Kf2 ½–½. Sijses,Wim – Hlavacek,Ladislav (1885), IECG, 2004.

4.e3 e6 5.a4 Nd7 6.Bd3 Bd3 7.Qd3 Ngf6 (7...Qg5 8.g3=+) 8.Nd2 Bd6 (8...e5!?=+) 9.Ba3= 0–0 10.Ngf3 Re8 11.0–0 Nb6 12.Ne5 Nfd7 (12...Be5 13.de5 Nfd7 14.Qd4=) 13.Bd6+= cd6 (14.Nd7 Qd7=). mic (2305) – cmarcolino (2510), net–chess.com, 2006.

3.d4 Bf5 4.g3=.

3.e3 Bd7

4.a4 e5 5.Bb2 f6 6.Nf3 c6 7.c4 dc4 8.Bc4 White is in command 8...Nh6 (8...cb5 9.ab5 Bg4 10.h3+=) 9.0–0 (9.Ne5!? Bf5 10.e4 fe5 11.ef5+–) 9...Bg4 10.h3 Bf3 (10...cb5!? 11.ab5 Bh5+=) 11.Qf3+– (11.gf3?! Qd7 12.Kg2 Nf5=) 11...Qe7 12.Ba3 Qd7 13.Bf8 Rf8 14.Rd1 Kd8 (better 14...Qf5!? 15.Qe2 g5+–) 15.d4+– Nf5?? (better 15...Qf5 16.de5 Ke8+–) 16.de5 Nd6 (16...fe5 17.bc6 Nc6+–) 17.Rd6 cb5 (17...Re8 18.Rd7 Nd7 19.ef6 gf6 20.bc6 bc6 21.Nc3+–) 18.Rd7 Nd7 19.Bb5 (better 19.e6 Ke7 20.Qb7+–) 19...Ne5 20.Qb7 Rc8 21.f4 (21.Nc3 Rc7 22.Rd1 Rd7 23.Rd7 Nd7 24.Qd7) 21...Rf7 22.Qb6 Rfc7 23.Nc3 Nd7 24.Rd1 (24.Qe6 Rc6 25.Bc6 Rc6 26.Qc6 Ke8 27.Rd1 Kf7 28.Qd7 Kg6 29.Qe8 Kh6 30.g4 g5 31.Qf8 Kg6 32.f5) 24...Rb8 25.Rd7 Kc8 (25...Ke8 26.Qb8 Rc8 27.Qc8) 26.Qc7 1–0. retiponziani – dunk0104, ChessWorld.net, 2008.

4.d4 c6 5.bc6 Nc6 6.Nd2 e5 (6...Rc8 7.c4=) 7.de5 Ne5 8.Bb2 f6? (8...Qc7 9.Rb1+=) 9.Ndf3?? (9.Be5!? fe5 10.Qh5 Ke7 11.Qe5 Be6+–) 9...a4 (better 9...Qc7!?=) 10.Ne5+– (10.Be5?! fe5 11.Rb1 Qa5 12.Qd2 e4 13.Qa5 Ra5=) 10...Qa5 11.Qd2 Qd2 12.Kd2 fe5 13.Be5 Bb4 (13...Nf6!? 14.Rb1 Ne4 15.Ke1 Rc8+–) 14.c3+– Bc5?? (better 14...Bf8+–) 15.Bg7 Ba3 (15...Ke7 16.Bh8 Nf6 17.Bf6 Kf6 18.Ne2+–) 16.Bh8 Bb2 (16...Nh6 17.Bd4+–) 17.Rb1 a3 18.Be5 (18.Bd3 h6+–) 18...Rc8 (18...Nh6 19.h3+–) 19.Ne2 (19.Bd3!? h6+–) 19...Nh6 20.g3 (20.f3 Nf7 21.Bd4 Nd6+–) 20...Nf7 (20...Ng4 21.f4+–) 21.Bd4 Ng5 (21...Nd6+–) 22.c4 Bd4?? (22...Rc4 23.Bb2 Discovered attack; 22...dc4 23.Bb2 Discovered attack) 23.Nd4 Rc4 (23...Ne4 24.Ke1 dc4 25.Rb7+–) 24.Kd3 (better 24.Bc4 dc4 25.Rb7 Ne4 26.Ke2 Ke7+–) 24...Rc7 (24...Ne4+–) 25.Bg2 Ne6 (25...Bc6 26.Rhc1+–) 26.Bd5 Nd4 (26...Nc5 27.Kd2+–) 27.Kd4 Bf5 (27...Bc6 28.Bc6 Rc6 29.Rb7+–) 28.Be4 (better 28.e4!? Bd7+–) 28...Be4 29.Ke4 Rc2 (29...Re7 30.Kf3+–) 30.Rb7 Rf2 31.Rhb1 (31.Rh7!? Kd8+–) 31...Ra2 32.Rc1 Rb2 (32...Kd8 33.Rh7 Rd2+–) 33.Rc8 1–0. Agiant – kinuthia, lichess.org, 2018.

3.e3 Bf5

4.Bb2 e6 5.c4 c6 6.Nf3 Nf6 7.Nc3 Bd6 8.d4 dc4 9.Bc4 cb5 10.Nb5 Bb4 11.Nd2 Nc6 (11...Ne4!? 12.Bc1 Qc8=) 12.a3+= Bd2 13.Qd2 (worse 13.Kd2 0–0 14.Ke1 Ne4=+) 13...Ne4 (13...a4!?+=) 14.Qe2+– 0–0 15.0–0 Nd6 16.Nd6 Qd6 17.f4 (17.e4 Bg6 18.d5 ed5 19.Bd5 Ne7+–) 17...h6 (17...Be4 18.a4+=) 18.g4 (better 18.e4!? Bg6 19.d5 ed5 20.Bd5+–) 18...Be4= 19.g5 hg5 20.fg5 Bd5 (better 20...Ne7!?=) 21.Bd3+– g6 22.Rf4 Rae8 23.Raf1 (better 23.Rf6 Bb3 24.Rc1+–) 23...Ne7?? (23...e5 24.Rf6 Qe7 25.Bg6 ed4+– (25...fg6?? 26.Rg6 Qg7 27.Rg7 Kg7 28.de5 Rf1 29.Qf1+–)) 24.e4+– Bc6 (24...e5 25.Rh4 Ba2 26.de5 Qc5 27.Kh1 Be6+–) 25.Rh4 1–0. combijack (1880) – oldtimer (1685), gameknot.com, 2016.

4.Bb2 e6 5.Nf3 Nf6 6.c4 Nbd7 7.Nc3 c6 8.Be2 Qb6 9.Na4 Qc7 10.Rc1 Nb6? (10...dc4 11.Rc4 e5 12.0–0=) 11.c5 (11.Be5!? Qd8 12.bc6 bc6 13.Nb6 Qb6 14.cd5 ed5 15.Bf6 gf6 16.Nd4+–) 11...Na4+= 12.Qa4 Be7 (12...Nd7 13.d4+=) 13.0–0 (13.Be5 Qc8+–) 13...0–0 14.Be5 Qd7 (14...cb5 15.Bb5 (15.Bc7?! ba4 16.d4 Rfc8=) 15...Qd8 16.Nd4+–) 15.bc6 bc6 16.Rb1?? (better 16.Nd4!? Rfc8 17.Nf5 ef5 18.d4+=) 16...Ng4 (better 16...Bb1 17.Bf6 Bf6 18.Rb1 Qc7–/+) 17.Rb3 Ne5 (17...Bc5 18.d4 Bb4 19.a3=) 18.Ne5+= Qc7 19.Nc6 Attacks the isolani on a5 (19.d4 Bc5 20.Rc1 Bb4=) 19...Bc5 20.Rc1 Bd6 21.Rbc3 (21.Qh4 a4 22.Rbc3 Qb7=) 21...Qd7 (better 21...Bh2!? 22.Kh1 Be5 23.Ne5 Qe5=+) 22.Bb5+= Qb7 23.Na5?? (better 23.Nd4 Bg4 24.f3+=) 23...Qa7 (23...Qb6 24.Rc6 Qa5 25.Qa5 Ra5 26.a4–+) 24.Qh4? (24.d4–+) 24...Qa5 25.d3 (25.a4–+) 25...Qb5 26.e4 de4 27.de4 Bg6 28.Rg3 (28.a3 Ra3 29.R3c2 Ra4–+) 28…Bg3 (28...Bg3 29.Qg3 Be4–+) 0–1. alddhsfd (1770) – Byncbonc (1785), lichess.org, 2019.

4.c4 c6 (--> 1.b4 c6 2.e3 a5 3.b5 d5 4.c4 Bf5).

3.Nf3 c6

4.a4 e6 5.Bb2 Nf6 6.e3 Bd6 7.Be2 0–0 8.0–0 Re8 9.d4 Nbd7 10.Nbd2 Qc7 11.c4 c5 12.h3 (12.dc5 Bc5 13.Nb3 dc4 14.Nc5 Nc5+/–) 12...b6 13.Rc1 Bb7 14.Nb3 dc4 15.dc5 Nc5 16.Nc5 Bc5 17.Be5 Qe7 18.Bc4 Rad8 19.Qe2 Bd5 (19...Ba3 20.Rc3=) 20.Bd5 Nd5 21.Bd4 Rc8 22.Rc4 Bd4 23.Nd4 Rc5 (23...Nc3 24.Qd3 Rc4 25.Qc4=) 24.Nc6+= Qf8 25.Rfc1 Rc4 26.Qc4 h6 27.e4 Nb4 28.Ne5 Qe7 29.Qc7 f6 30.Qe7 Re7 31.Rc8 Kh7 32.Nc4 Rb7 33.Re8 Rc7 34.Nb6 Rc1 35.Kh2 Nd3 36.f3 Rc2 37.Re6 Nf4+/– 38.Rc6 Rg2 39.Kh1 Rg3 40.Kh2 Rh3 41.Kg1 Rg3? 42.Kf2+/– Rg2 43.Ke3 g5 44.Kd4 Rd2+= 45.Kc4 Ne2 46.Rf6+– Rd4 47.Kc5 Rb4 48.e5 Nd4? 49.e6 Kg7 50.Rf7 Kg8 51.Kd5 Nb5 52.ab5 Rb5 53.Kc6 Re5 54.Kd6 Re3 55.Nd5 Rd3 56.Ke5 a4 57.Nf6 (57.Nf6 Kh8 58.Rh7#) 1–0. Huelle,Gunter – Grassmehl,Gerhard (1695), Leipzig VfB op, 2004.

4.e3 cb5 5.Bb5 Bd7 6.Nc3 Bb5 7.Nb5 Qd7 8.a4 b6 (8...Nc6 9.Bb2+=) 9.0–0 e5? ( 9...Nc6+=) 10.Ne5+– Qe7 11.Ba3 Qe5 12.d4 Qg5 (12...Qf6 13.Nc7 Kd8 14.Nd5 Qg6+–) 13.Nc7 Kd8 14.Na8 Ba3 15.Ra3 Nd7 16.Rb3 (16...Qg6 17.Qb1+–) 1–0. Wall,Bill – Clapton, Internet, 2002.

4.e3 Bf5 5.Nc3 e6 6.Nd4 Bg6 7.h4 (7.bc6 bc6 8.Bb2 e5=) 7...h5 (7...c5 8.Nde2=+) 8.bc6 bc6 9.Bd3 (9.Nf3 Bd6=) 9...Bd3=+ 10.cd3 Nf6 11.Qa4 Qc7 12.Rb1 Be7 13.Ba3 Ba3 14.Qa3 Nfd7 15.0–0 Rh6 16.Rfc1 Ne5? ( 16...c5+=) 17.f4 Ng6?? (17...Nd3 18.Ncb5! Qe7 19.Qd3 c5+–) 18.Ncb5! Qd7 (18...cb5 19.Rc7) 19.Nd6 Kd8 (19...Kf8 20.Rb7 Kg8 21.Rd7 Nd7 22.Nc6+–) 20.Rb8! Rb8 21.Nc6 Kc7 (21...Qc6 22.Rc6 Rb1 23.Rc1 Rc1 24.Qc1 Nh8 25.Qc8 Ke7 26.Qc7 Kf6+–) 22.Ne5 Kd8 23.Nd7 Kd7 24.Qc5 (24...e5 25.Qc7 Ke6 26.f5 Kf6 27.Qf7) 1–0. gtate (2305) – cmarcolino (2555), net–chess.com, 2006.

3.Nf3 e6

4.Bb2 Nf6 5.e3 Bd6 6.c4 0–0 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3 Bd6 6.c4 0–0).

4.d4 Bd6 5.e3 Nf6 6.Bd3 0–0 7.0–0 c5 (7...Nbd7 8.Ba3=) 8.c4 (8.dc5 Bc5 9.Nbd2 Nbd7=) 8...Nbd7 (8...cd4 9.ed4 dc4 10.Bc4=) 9.Qc2 (9.cd5 ed5 10.dc5 Nc5=) 9...dc4 10.Bc4 cd4 11.ed4 (11.Nd4 Qc7 12.f4 Rd8=) 11...Qc7 12.h3 (12.Bd3!?=) 12...b6=+ 13.Nbd2 Bb7 14.a4 (14.Qd3 Rfd8–/+) 14...Rfe8 ( 14...Bf3!? 15.gf3 Rac8–+) 15.Qd3 e5 (15...Rad8 16.Bb2=+) 16.de5 (16.Qb3 Re7=+) 16...Be5 (16...Ne5 17.Ne5 Be5 18.Ra2–/+) 17.Ra2 Nc5 18.Qc2 Rad8 19.Ne5 Qe5 20.Ra3 Qd6 21.Re3 (21.Rg3 Re7=) 21...Re3–/+ 22.fe3 Nd3 (22...Qg3 23.Rf2–/+) 23.Nf3 Nc1 24.Qc1 h6 25.Nd4 Rc8 26.Nf5? (26.Rf2 Qe5=+) 26...Qc5 ( 26...Qe5!? 27.Nd4 Qe4–+) 27.Rf4 (27.Bf7!? Kf7 28.Qc5 Rc5 29.Nd6 Ke7 30.Nb7–/+) 27…Bd5–+ 0–1. Krause – Fritz,Harry, corr, 1966.

3.a4 c5

4.c4 e6 5.e3 =+.

4.c4 Nf6 5.Nf3 Bg4 (5...e6 6.e3=+) 6.h3 (6.cd5 Nd5 7.Bb2 e6=) 6...Bf3=+ 7.ef3 d4 (7...e6 8.cd5 ed5 9.Bb2=+) 8.d3 (8.Bd3 e6=) 8...e6=+ 9.Be2 Bd6 10.Nd2 Qc7 11.Ne4 Ne4 (11...Nbd7 12.0–0=+) 12.fe4= Bf4 13.Bf3 (13.Ba3 0–0=) 13...Nd7 14.Bf4 Qf4 15.g3 Qc7 (15...Qh6 16.Bg2=+) 16.Bg2 (16.0–0 0–0=) 16...h5 17.Qd2= h4 18.g4 e5 19.Qg5 Kf8 20.Kd2 Kg8 21.Kc2 b6 22.Qd2 Nf8–/+ 23.Raf1 Ne6 24.f3 Qe7 25.Rf2 Rd8 26.Kb3 Rd6 27.Rhf1 Nf4 28.Kc2 Rhh6 29.Rh1 Rhg6 30.Bf1 Rdf6 31.Be2 Ne6 32.Bf1 Rf4 33.Bg2 Qg5 34.Rhf1 Rgf6 35.Qd1 g6 36.Qe2 Ng7 37.Qd2 Re6 38.Qe2 Ne8 39.Kb3 Nd6 40.Qd2 Re8 41.Qe2 Kg7 42.Kc2 Rd8 43.Kb3 Kh6 44.Qc2 Ne8 45.Qe2 Nc7 46.Qc2 Ne6 47.Qc1 Rf6 48.Qd1 Qf4 49.Qd2 Qd2 50.Rd2 Kg5 51.Kc2 Kf4 52.Rff2 Ng5 53.Kd1 Kg3 54.Ke2 Rf8 55.Rd1 Kf4 56.Rg1 Ne6 57.Bh1 Kg5 58.Bg2 Nf4 59.Kd2 Rd6 60.Re1 Rd7 61.Ref1 Kf6 62.Rg1 Ke6 63.Re1 f6 64.Bf1 Rdf7 65.Bg2 Re7 66.Kc2 f5 67.Kd2 Rff7 68.Bf1 fg4–/+ 69.fg4 Kf6 70.Rh2 Kg5 71.Be2 Rf8 72.Bd1 Ne6 73.Ree2 Ref7 74.Re1 Rf2 75.Re2 Rh2 76.Rh2 Rf1 77.Ke2 Rg1 78.Rf2 Nf4 79.Kf3 Rg3 0–1. Dolejs,Dan – Fabri,Ferenc (2265), North Island–ch NZL, 1996.

4.e3 b6 5.Nf3 Bg4 6.Be2 Nf6 7.Bb2 e6 8.d3 Nbd7 9.Nbd2 Rc8 10.0–0 Bd6 11.c4 Bf3 12.Nf3 Qc7 13.cd5 ed5 14.h3 Ne5 (14...0–0 15.Rc1=) 15.Rc1 0–0 16.Nd4 Qe7 (16...Rfe8 17.Nf5+=) 17.Nf5+– Qe6 18.Nd6 Qd6 19.f4 (19.d4 Ned7+=) 19...Ng6= 20.Qe1 Rfe8 21.Qg3 (21.f5 Ne5=) 21...h6 (21...d4 22.e4 Nd5 23.Bg4 Ndf4 24.Kh1–/+) 22.Rc2 Re7 23.Kh2 Rce8 24.Bc1 Qd7 25.f5 Ne5 26.d4 cd4 (26...Nc4!? 27.Bc4 dc4 28.Rc4 Qd5–/+) 27.ed4+= Nc4 (27...Ne4!? 28.Qf4 g5 29.fg6 Ng6 30.Qh6 Qd6 31.Bf4 Qb4+–) 28.Bh6+– Qc7?? (28...Qd6 29.Rf4 Nh5 30.Bh5 Qh6+–) 29.Rf4+– Qf4 (29...Ng4 30.Bg4 (worse 30.hg4 Re2 31.Re2 Re2–+; worse 30.Rg4 Qg3 31.Kg3 Re2 32.Rg7 Kh8 33.Re2 Re2 34.Rf7 Nd6 35.Rf8 Kh7+–) 30...f6 31.Bf3+–) 30.Bf4 (better 30.Qf4 gh6 31.Bc4 dc4 32.Qh6 Nh7+–) 30...Re2 31.Re2 Re2 32.Bh6 Ne8 (32...Nh5 33.Qg5 f6 34.Qh5+–) 33.Bg7! Re3 (33...Ng7 34.f6 Pinning (34.f6 Decoy)) 34.Qg5 (34.Qg5 f6 35.Bf6 Kf8 36.Qh6 Kg8 37.Qg6 Kf8 38.Bg5+–) 1–0. Burns,Chris – Post,Martin, Wanganui Chess Club A–Grade Rapid NZL, 2002.

4.e3 Bf5 5.c4 e6 6.Bb2 Nf6 7.Nf3 Be7 8.d4 0–0 9.Be2 cd4 (9...dc4 10.Bc4 Nbd7 11.dc5 Bc5 12.Nbd2=) 10.Nd4= Bb1 11.Rb1 Bb4 12.Kf1 Nbd7 13.cd5 Nd5 14.g3 (14.Rc1 Nc5=) 14...Nc5 15.Nc2? ( 15.Kg2!?=) 15...Na4–/+ 16.Nb4 Nb2 17.Rb2 Nb4 18.Kg2 Qb6 ( 18...Qd5 19.Qd5 Nd5–/+) 19.Qd7? (19.Qa4 Rfd8–/+) 19...Rfd8 ( 19...Nd5 20.Rd1 Rfd8 21.Rd5 ed5–+) 20.Qe7 Nd5 21.Qg5 h6 (21...a4 22.Rc2–/+) 22.Qe5–/+ Qd6 23.Qd6 Rd6 24.e4 Nc3 25.Bf3 e5 ( 25...a4!?–+) 26.Rc1=+ Na4 27.Ra2 Nb6 28.Rca1 (28.Rc5 f6–/+) 28...a4–+ 29.Rc1 Nd7 (30.Ra3 Rd4–/+) 0–1. Lykhmus,AA – Wrinn,Steven J, corr ICCF WT/H/432, 1983.

4.Nf3 Nf6 =.

3.a4 e5

4.Bb2 d4 5.c4 g6 6.g3 Bg7 7.Bg2 Ra7 8.e4 Be6 9.d3 Ne7 10.Nd2 Nd7 11.g4 (11.Ngf3 h6=) 11...c5 12.bc6 bc6 13.Ba3 c5 14.Bh3 Nc6 15.g5 Qg5 16.Be6 fe6 17.Ndf3?? (better is 17.h4 Qg2 18.Qf3 Qf3 19.Ngf3–/+) 17...Qg2–+ 18.Ke2 Qh1 19.Rb1 (19.Qf1 Rb7–+) 19...0–0 20.Qf1 Rf3! 21.Nf3 Qf1 22.Kf1 (22.Rf1 Rb7–+) 22...Nb4 23.Ke2 (23.Rb3 Nb6–+) 23...Nb6 24.Ng5 Na4 (24...Na4 25.Kd2 Bh6–+) 0–1. Larsen,Helge – Pedersen,Birger, Alta ASK CC–ch, 2006.

4.Bb2 Nd7 5.e3 Be7 (5...Ngf6 6.c4=+) 6.Nc3 (6.d4 e4=+) 6...Ngf6 7.d4 e4 8.Nh3 (8.Ba3 Ba3 9.Ra3 Nb6=+) 8...Nb6 9.Nf4 Bb4 10.Be2 g5 11.Nh5? ( 11.Nh3–/+) 11...Nh5–+ 12.Bh5 Nc4 13.Ra2 (13.Qc1 g4 14.b6–+) 13...Nb2 14.Bf7 Kf7 15.Qh5 Kg8 16.0–0 Bc3 17.Ra3 Bb4 18.Ra2 Nc4 19.f3 Ne3 20.Rf2 Bf5 21.fe4 de4 22.Qh6 Ng4 (23.Qh3 Qd4 24.Qb3 Kg7–+) 0–1. tschulz – bjeu, MySchachOpen, 2005.

4.Bb2 f6 (--> 1.b4 e5 2.Bb2 f6 3.b5 d5 4.a4 a5).

4.d4 e4 5.Nc3 Nf6 6.Bg5 (6.Bd2 Nbd7–/+) 6...Bb4 7.Bd2 (7.Qd2 0–0 8.e3 Nbd7–/+) 7...e3!–+ 8.fe3 (8.Be3 Bc3 Double attack (8...Bc3 Deflection); 8.fe3 Ng4 Decoy) 8...Qe7 (8...0–0 9.Nf3 Re8 10.Qc1–+) 9.Nf3 Bc3 10.Bc3 Qe3 (better 10...Ne4!? 11.Bd2 Nd7–/+) 11.Bd2+= Qe6 12.e3 Nbd7 0–1. blackfox – sasikumar, net–chess.com, 2019.

4.e3 Be7 5.Bb2= Bf6 6.Nf3 Bg4 7.Be2 Nd7 8.0–0 (8.d4 e4 9.Nfd2 Be2 10.Qe2 Ne7=) 8...Ne7 (8...Bf3 A) worse 9.Bf3 e4 10.Bf6 Qf6–/+ (10...Ndf6?! 11.Be2=; 10...Ngf6?! 11.Be2=); B) 9.gf3 Ne7 10.d4=+) 9.c4 (9.d4 e4 10.Nfd2 Be2 11.Qe2 c6=) 9...c6 (9...e4 10.Bf6 ef3 11.Bf3 Bf3 12.Be7 Bd1 13.Bd8 Rd8 14.Rd1 dc4 15.Na3+=) 10.Nc3 0–0 11.h3 (11.cd5 cd5 12.d4 ed4 13.Nd4 Be2 14.Nce2 Rc8=) 11...Be6 (11...Bf3 12.Bf3 dc4 13.Rb1=) 12.Qb3 (12.cd5 cd5 13.d4 Rc8=) 12...Re8 (12...dc4 13.Bc4 Nc5 14.Qa2=+) 13.Rac1 (13.cd5 cd5 14.d4 ed4 15.Nd4 Bd4 16.ed4 Nf5=+) 13...Qb6 (13...e4!? 14.cd5 cd5=+) 14.d4= e4 (14...ed4!? 15.ed4 dc4 16.Bc4 Bc4 17.Qc4 Rad8=) 15.Nd2+= Qd8 16.Ba3 Nf8 17.f3 (17.Bc5 Nd7+=) 17...Nf5= 18.Nd1 (better 18.bc6!? bc6 A) worse 19.fe4 Ne3 20.cd5 cd5 (20...Nf1?! 21.de6 Ne6 22.Nf1=+) 21.ed5 A1) 21...Nf1?! 22.de6 Ne6 23.Kf1=+ (worse 23.Nf1 Rc8–+); A2) 21...Nd5 22.Nd5 Bd5–/+ (worse 22...Qd5 23.Qd5 Bd5 24.Rf6 gf6 25.Bb5=+); B) 19.cd5=) 18...Ng3–/+ 19.Rf2 Bh4 (19...Ne2!? 20.Re2 ef3 21.Nf3 dc4–/+) 20.Qc2 (20.fe4 de4 21.Rc2 Qg5=+) 20...Ne2 21.Re2 ef3 22.Nf3 dc4 (22...cb5 23.Bf8 Rf8 24.cb5 Rc8=+) 23.Ne5 (better 23.bc6!? bc6 24.Nb2=) 23...cb5–/+ 24.ab5 Rc8 (24...Nd7 25.Nc4 Rc8 26.Ndb2–/+) 25.Nf3 (25.Bf8 Rf8 26.Qa4 f5–/+) 25...b6 (25...Ng6 26.Nc3–/+) 26.Qe4 (26.Bf8!? Rf8 27.Nh4 Qh4 28.Nc3–/+) 26...Bg3 27.Qb7?? (better 27.Bf8 f5 28.Qc2 Rf8 29.Nc3–/+) 27...Bd5 28.Qa7 (28.Qa6 Ra8 29.Nc3 Ra6 30.ba6 Bf3 31.gf3–+) 28...Bf3 (better 28...Ra8 29.Qa8 Qa8–+) 29.gf3 Ne6 30.Rec2?? (30.Nc3 Bb8 31.Qb7 Qh4–+) 30...Ng5 (better 30...Nd4 31.Rb2 Qg5–+) 31.Kg2 Bh4 32.Rc4?? (32.Qb7 Rc7 33.Qb6 Nf3 34.Nf2 (34.Kf3?? Qd5 35.Kg4 Re4 36.Kf3 Rd4 37.Ke2 Qg2 38.Nf2 Qf2) 34...Re3 35.Bd6–+) 32...Rc4 33.Rc4 (33.Qb7 Rc1 34.Bc1–+) 33...Qd5 34.Qb6 0–1. RichardSommer (2130) – ElSupremo04 (2085), lichess.org, 2020.

4.Bb2 Bd6

5.e3 f5 6.h4 (6.d4!?=) 6...Nf6=+ 7.c4 Be6 8.Na3 (8.Nf3 dc4 9.Ne5 Be5 10.Be5 Nbd7=) 8...Nbd7 9.Nf3 h6 (9...0–0 10.Ng5 Nc5 11.d4 ed4 12.ed4+/–) 10.Be2 (10.cd5 Bd5 11.Nc4 Qe7=+) 10...Qe7 11.d4 Bb4 12.Kf1 e4 13.Ne5 Ne5 (13...Rg8 14.Ng6 Qf7 15.cd5 Nd5 16.h5=) 14.de5 Ng4 15.cd5 0–0–0 (15...Rd8 16.Bc4 Qf7 17.h5=+) 16.d6 cd6 17.b6 (17.ed6 Bd6 18.Qc2 Kb8=) 17...Ne5 (17...Kb8 18.Bg4 de5 19.Be5 Ka8 20.Qc1 fg4 21.Nb5 Bc4 22.Qc4 Qe5 23.Rc1=) 18.Be5 ( 18.h5!?=+) 18...de5–+ 19.Qc2 Kb8 20.Nb5 Rc8 21.Nc7 Rhd8 22.Qb2 Qf6 23.Rc1 Rd2 24.Rc2 Rcd8 25.g3 Rc2 26.Qc2 Rc8 27.Kg2 Bd7 28.Rd1 Bc6 29.Bc4=+ f4 30.Be6 Rc7 31.bc7= Kc7 32.Rd7?? Kb6 33.Qc4 Bd7 34.Bd7 fg3 35.Qb5?! Ka7 36.fg3 Qf3 37.Kh3 h5 38.Kh2 Qf2 39.Kh3 Qg1 40.Qe2 Be1 41.Qg2 Qe3 42.Be8 g5 43.hg5 Qc3 44.Bh5–/+ e3 45.g6 Bf2 46.Bf3 Qc8 47.Kh4 Qf5 48.Be4?? Qf6 49.Kg4 e2 50.Qf2 Qf2 (51.Kh4 e1Q–+) 0–1. Roell,Uwe – Goeldenboog,Juergen, Bochum Post op, 1990.

5.e3 Bf5 6.Nf3 Nd7 7.c4 Ngf6 8.cd5 Nd5 9.Nc3 Nc3 10.Bc3 Qe7 11.Be2 0–0 12.0–0 Rad8 (12...Rfc8 13.Rc1=) 13.Qb3 (13.Ba5 Rfe8+=) 13...b6 (13...Nc5 14.Qd1=+) 14.h3 (14.d3 Rfe8=) 14...Be6 (14...Nc5 15.Qd1=+) 15.Bc4 Nc5 16.Qa2 Bc4 17.Qc4 e4 18.Nd4 Qe5 The mate threat is Qh2 19.f4 ef3 (19...Qh5 20.Nc6 Rd7 21.Rad1=+) 20.Nf3= (20.Rf3? Qh2 21.Kf1 Ne4–+) 20...Qh5 21.Nd4 (21.Nh4 Nb3 22.Rf5 Qh6+–) 21...Ne4 (21...Qh4 22.Rf3=) 22.Nc6 (22.Nf5 Nc3 23.Qc3 Qg6+=) 22...Rde8= 23.Rf3 Kh8 (23...Qg6 24.Qd5=+) 24.Raf1 f5 (24...f6 25.Rc1=+) 25.Qd5 (25.Nd4 Nc3 26.Qc3 f4=) 25...Qg6 (25...Nc3 26.dc3 Qh4 27.c4=) 26.Rf5 (26.Be5 Ng5 27.Rf5 Rf5 28.Rf5 Be5 29.Qe5 Nh3 30.Kf1 Ng5+–) 26...Rf5= 27.Qf5 Nc3 (27...Qf5 28.Rf5 Nc3 29.dc3 Re3 30.Rf3 Re1 31.Rf1=) 28.Qg6+= (worse 28.dc3 Qg3 29.Rf3 Qe1 30.Rf1 Qe3 31.Qf2 Qc3–/+) 28...Ne2?? (better 28...hg6 29.dc3 Re3=) 29.Kf2+– Threatening mate... how? 29...hg6 30.Ke2 Bb4 (30...Re6 31.d4+–) 31.Rf7 Bd6 32.Nd4 (32.d4!? Kg8 33.Rd7 g5+–) 32...Kg8 (32...Kh7 33.d3+–) 33.Rf1 (33.Rd7 Kh7+–) 33...Rc8 (33...g5 34.Nf5+–) 34.Rc1 (34.Nc6 g5+–) 34...Bc5 (34...Re8 35.Nc6+–) 35.Ne6 Bd6 36.e4?? (36.d4 Kf7 37.d5 Ke7+–) 36...Kf7? (better 36...Re8 37.Nd4 Re4 38.Kd3 Rf4+–) 37.Nd4+– Ke7 (37...Re8 38.d3+–) 38.Nf3 (38.Nc6 Kd7+–) 38...Kd7 39.d4 White prepares the advance e5 39...Re8 40.e5 Bb4 (40...g5 41.Kd3 g4 42.hg4+–) 41.Kd3 c6 (41...Ba3 42.Rc6 Re6+–) 42.bc6 Kc7 (42...Kc7 43.d5 Ba3+–). RichardSommer (2155) – ranger_power (2180), lichess.org, 2020.

5.e3 Nf6 6.Nf3 e4 7.Nd4 =+.

5.e3 Nf6 6.Nf3 Qe7 7.Be2 Bd7 (7...0–0 8.0–0=+) 8.0–0 (8.d4 e4 9.Ne5 0–0=) 8...0–0 (8...e4 9.Nd4=) 9.c4 (9.d4 e4 10.Ne5 Be6=) 9...c6 (9...e4 10.Ne1=+) 10.Nc3 (10.c5 Bc5 11.Be5 Bb4=) 10...dc4 (10...e4 11.Ne1=+) 11.Bc4 Bg4 (11...e4 12.Nd4–/+) 12.Be2 (12.d3 Nbd7=) 12...Rd8 (12...e4 13.Nd4 Qe5 14.g3=+) 13.h3 Bh5 14.d4 Nbd7 15.Qb3 e4 16.Nd2 Be2 17.Ne2 Nd5 (17...Rac8 18.bc6 Rc6 19.Rab1= (19.Qb7?? Rb6 20.Qb6 Nb6–+)) 18.Nc4 (18.Ba3 Ba3 19.Qa3 Qa3 20.Ra3 cb5 21.ab5 N7f6=) 18...Bb4 19.Nf4 (19.Ba3 Ba3 20.Ra3 Qe6=) 19...N7f6 (19...Nf4 20.ef4 cb5 21.ab5–/+) 20.Ne5 (better 20.Nd5!? Nd5 21.bc6 bc6 22.Ne5=) 20...Nf4–/+ 21.ef4 cb5 22.ab5 Rac8 (22...Nd5 23.Rfd1–/+) 23.Bc1 (better 23.f3!?=+) 23...Nd5–/+ 24.Bb2 Nf4 25.Rac1?? (better 25.Kh2–+) 25...Ne2 26.Kh1 Nc1 27.Bc1 Qe6 (better 27...Rd4!? 28.f4–+) 28.Qe6 fe6 29.Be3 Bc3 30.Rb1 (30.Rc1 Bb2 31.Rc4 Rc4 32.Nc4 a4–+) 30...Bd4 31.Bd4 Rd4 32.Kh2 a4 33.Ra1 (33.b6 Rc2–+) 33...Ra8 (33...Rc5 34.Ng4–+) 34.Nc4 (34.Nc4 Rc4 35.Kg3–+) 1–0. KLINGON09 (1895) – Hynders (1820), lichess.org, 2019.

5.e3 Nf6 6.h3 0–0 7.Nf3 Re8 8.Ba3 Qe7 9.Bd6 Qd6 10.c4 d4 11.Be2 (11.Qc1 Bf5–/+) 11...d3 12.Bf1 Nbd7 13.Qb3 e4 14.Nd4 Nc5 15.Qb2 Be6 16.Qa2 Bd7 (16...Nfd7 17.Ne6 Qe6 18.Nc3–+) 17.Nc3–/+ Ne6 18.Nf5 Qf8 19.g4 Ng5 (19...Nc5–/+) 20.Nd5 (better 20.Nd4!?–/+) 20...Nd5 21.cd5 Nf3 (21...Bf5 22.gf5 Nf3 23.Kd1–+) 22.Kd1 c6 (22...Bf5!? 23.gf5 Qe7 24.h4 Nh4 25.Rc1–+) 23.Bg2 (23.bc6 bc6 24.dc6 Bc6 25.Bg2–/+) 23...cd5 (better 23...Bf5!? 24.Bf3 Bd7 25.dc6 Be6–+ (25...ef3 26.cd7 Red8 27.Qd5+=; 25...bc6?! 26.Bg2–+)) 24.Bf3=+ Bf5 25.gf5 ef3 26.Qd5 (26.f6=+) 26...Red8 (26...Qb4 27.Qd3 Red8–+) 27.Qf3 Qb4 28.Qb7?? (28.Ke1 Rac8=) 28...Qb2?? (28...Rab8 29.Qc6 Rbc8–+) 29.Rc1= Qb3 (29...Rab8 30.Qc6 Qb3 31.Ke1 Qa4 32.Rg1 Qb5 33.Qf6=) 30.Ke1 Qa4 The passed pawn on a5 quickly leads to threats 31.f4 Rab8 32.Qe7 (32.Qg2 Qb5 (worse 32...Rb5 33.Rg1 g6 34.Qc6+=) 33.Rg1 Qb2–/+) 32...Qb5–/+ 33.Kf2 Qf5 34.Rc5 Qg6 (34...Rd5 35.Rb1 Rf8 36.Rc7–/+) 35.Rg5 (35.Rg1 Qb6 36.Qe5 g6 37.Ra5 Qb4=+) 35...Qc6 (35...Qb6 36.Qa3–/+) 36.Rb1 Ra8 Black gets strong initiative 37.Rb7 Threatening mate: Qxf7 37...Rf8 38.Qe5 Exerts pressure on the isolated pawn (38.Rd7 Qh6=+) 38...Qh6 (38...g6 39.Rc7 Qb6 40.Rd7–/+) 39.Kg3 (39.Qd5!?=+) 39...a4–/+ 40.Qd5 a3?? (better 40...Qa6–/+) 41.Rf7+– Kh8 (41...Rf7 Deflection from a8 42.Qa8) 42.Rf8 (42.Rfg7?! Qg7 43.Rg7 Kg7 44.Qd7 Rf7=) 42...Rf8 43.Qc5?? (better 43.Qd3 a2 44.Qa3+–) 43...Ra8=+ 44.Qd5 (44.Qc3 a2 45.Ra5 Qg6 46.Kf3 Qe8=+) 44...Qa6–/+ Black plans a2 45.Qd4 Do you see the mate threat? 45...Qa7 46.Qa7 Ra7 47.Rb5 The mate threat is Rb8 47...Kg8 48.Rb1 a2 49.Ra1 Kf7 50.Kf3 Ra4 51.Kg4 Ke6 52.h4? (better 52.e4–/+) 52...Kd5–+ 53.h5 (53.Kf3 Kc4 54.e4 Kb3–+) 53...Kc4 54.f5 (54.e4 Kb3 55.e5 Kb2–+) 54...Kb3 55.Kg5 (55.Kf3 Kb2 56.h6 gh6 57.Ra2 Ra2 58.e4–+) 55...Kb2 56.h6 (56.Ra2 Ra2 57.Kf4–+) 56...gh6 57.Kh6 Ka1 58.f6 Kb2 (better 58...Ra7 59.Kg5 Kb1 60.Kf5–+) 59.f7 Ra8 60.Kg7 a1Q 61.f8Q Qg1 62.Kf7 Qf1 (62...Qg6 63.Ke7 Ra7 64.Kd8 Qb6 65.Ke8 Qb8) 63.Ke7 Qf8 64.Ke6 0–1. hamiltonharris (1930) – bobby fissure (2115), ChessWorld.net, 2020.

5.Nf3 Nd7 6.c4 =+.

5.Nf3 Qe7 6.e3 (6.c4 dc4 7.Na3 c3 8.dc3 e4+=) 6...Nf6 7.c4 (7.Be2 0–0+=) 7...c6 (7...e4 8.Nd4+=) 8.Be2 (8.d4 ed4 9.Bd4 0–0=) 8...0–0 (8...e4 9.Nd4+=) 9.0–0 (9.d4 e4 10.Nfd2 dc4 11.Nc4 Bb4 12.Bc3 cb5 13.ab5 Nd5 14.Bb4 Qb4 15.Nbd2 a4=) 9...Bf5 (9...e4 10.Ne1+=) 10.d3 (10.d4 ed4 11.Qd4 dc4 12.Qc4 Rc8=) 10...Nbd7 (10...dc4 11.dc4 Rd8 12.Nbd2+=) 11.Nbd2= e4 12.Nd4 Qe5 (12...Bg6 13.bc6 Qe5 14.g3 bc6 15.de4 de4 16.Qc2=) 13.g3 (better is 13.f4!? ef3 14.N2f3 Qe3 15.Kh1+=) 13…Bh3 (13...Bh3 14.f4 Qe7+=; 13...ed3 14.Bf3–/+) 0–1. Cornacchini,Gabriele – Shi,Paul, RL–2007–0–00093, 2007.

4.e3 Nf6

5.Bb2 Bd6 6.c4 dc4 7.Bc4 Nbd7 8.d4 e4 (8...0–0 9.Ne2=+) 9.Qb3 (9.Nc3 0–0=) 9...0–0 10.Ne2 Nb6 11.Nec3 (11.Nd2 Bg4=+) 11...Nc4–/+ 12.Qc4 Be6 13.Qe2 Bg4 (13...Rc8 14.0–0=+) 14.Qc2 Re8 15.0–0 Qd7 16.Nd2 The pressure on e4 grows 16...Bf5 (16...Qf5 17.Ba3=+) 17.h3 (17.Ba3 Qe6=) 17...Bh3=+ 18.Nce4 (18.gh3 Qh3 Combination) 18...Qg4 (18...Ne4 19.Ne4 Bf5 20.Nc5=) 19.Ng3 Bg3 20.fg3 Qg3 (20...Re3?! 21.Rf2 (21.gh3?? Qg3 22.Kh1 Qh3 23.Kg1 Qg4 24.Kh2 Rh3) 21...Rg3 22.Nf1 Rg2 23.Rg2 Bg2 24.Qg2 Qg2 25.Kg2=) 21.Nf3 Bg4 (21...Re3!? 22.Qf2 Qf2 23.Kf2–+) 22.Qf2 (22.Ra3 Bf3 23.Rf3 Qd6–/+) 22...Qd6 (22...Qf2 23.Kf2 Ne4 24.Kg1–/+) 23.Ba3 Qd5 24.Ne5 Bh5 (24...Be6 25.Qf3–/+) 25.Qh4 (25.Qc2 Nd7 26.Nd7 Qd7–/+) 25...Re6 26.Rf5 (better 26.Rfc1 Rc8 27.Bb2–/+) 26...Qe4?? (better 26...Qb3 27.Qf4 Qc3–+) 27.Qe4+– (27.Rh5?? Qe3 28.Qf2 Qf2 29.Kf2 Nh5–+) 27...Ne4 28.Rh5 Rg6?? (28...h6 29.Rh4 Ng5 30.Rc1+–) 29.Rh2 (29.Ng6!? hg6 30.Re5 Nf6+–) 29...Ng3? (29...Rg3 30.Re1 f6+–) 30.Ng6 Ne2 (30...hg6 31.Kf2 Ne4 32.Kf3 f5+–) 31.Kf1 (31.Kf2 fg6 32.Ke2 c6+–) 31...hg6 (31...Ng3 32.Kf2 Nf5 33.Ne5+–) 32.g4 (better 32.Ke2 f5+–) 32...Nc3 33.Ke1 (33.Rc1 Nd5 34.e4 Ne3 35.Ke2 Ng4+–) 33...Ne4 (33...Re8 34.Rc1 Nd5 35.Kd2+–) 34.Bb2 (34.Rc1 Rc8+–) 34...Ng3 (34...Nf6 35.g5 Ne4 36.Rc1+–) 35.Rg2 (35.Rc1 c6 36.bc6 bc6 37.Rc6 Ne4+–) 35...Ne4 36.Ke2 (36.Rc1 Rc8 37.d5 Nd6+–) 36...Nd6 (36...Re8 37.Rc1 Re7 38.g5+–) 37.d5 (37.Rc1 Ne8+–) 37...Re8 (37...Rd8 38.Rc1 Rd7 39.Kf3+–) 38.Ra3 (38.Rc1 Rc8+–) 38...c5 (38...Nc4 39.Rb3 Nb6 40.Rd3 Na4 41.Bd4+–) 39.Rc3 (better 39.dc6 bc6 40.bc6 Rc8+–) 39...b6 40.Rg3 (better 40.g5!? Re4 41.Ra3 Nf5+–) 40...Ne4 41.Kf3 (41.Rg1!? Nc3 42.Bc3 f6+–) 41...Nc3 (41...Ng3 42.Kg3 g5 43.Kf3+–) 42.Bc3 1–0. afsharian – khudaid, lichess.org, 2019.

5.Nf3 Bd6 6.Be2 (6.Bb2 Nbd7+=) 6...0–0 7.d4 (7.Nc3 Bf5+=) 7...ed4 (7...Nbd7 8.0–0–/+) 8.Nd4 (8.Qd4 c5 9.Qd3 Nbd7+=) 8...c5 (8...Ne4 9.0–0 c5 10.Nb3+=) 9.Nf3+= Nbd7 10.0–0 Nb6 11.Nbd2 Bf5 12.Bb2 Qe7 13.c4 (13.Bd3 Ne4+=) 13...Rfd8 (13...Rad8 14.Nh4 Bd7 15.Nhf3+=) 14.Nh4 Be6 15.Nhf3 dc4 16.Qc2 Rd7 (16...c3 17.Bc3 Nfd5 18.Bb2+=) 17.Rfd1 Bd5 18.Nc4 Nc4 19.Bc4 Bc4 20.Qc4 Rad8 21.Kf1 Ne4 22.h3 b6 (22...Bc7 23.Rd7 Rd7 24.Kg1+=) 23.Rd3= Nf2 (23...Bc7 24.Rad1 Rd3 25.Rd3=) 24.Kf2 Bg3 25.Kg3 Rd3 26.Re1 Re3 27.Qg4 g6 28.Re3 Qe3 29.Be5 Re8 30.Qf4 Qf4 31.Kf4 f5 32.Kg5 (32.Nd2 Re7=) 32...Re6 33.g4 (33.Bc7 Kg7 34.Be5 Kf7=) 33...h6 (33...fg4 34.hg4 Re7 35.Kf4+=) 34.Kf4= fg4 35.hg4 c4 (35...h5 36.Bc7=) 36.Nd2 Re5 37.Ke5 c3 38.Nb3 c2 39.Nc1 (39.Kf4 h5=) 39...h5= 40.gh5 (40.Kf4 h4=) 40...gh5 41.Ne2 Kg7 (41...h4 42.Kf4=) 42.Kd4 h4 43.Kc3 Kf6 44.Kc2 h3 45.Kd3 h2 46.Ng3 Ke5 47.Nh1 (47.Ke3 Kd5=) 47...Kf4= 48.Ke2 Ke4 49.Kf2 Kd4 50.Kf3 Kc4 51.Ke4 Kb4 52.Kd5 Ka4 53.Kc6 Kb4 54.Kb6 a4 55.Kc6 Kc4 56.b6 a3 57.b7 a2 58.b8Q a1Q 59.Qh2 Qa6 60.Kd7 Qb5 61.Ke6 Qe8 62.Kf6 Qf8 63.Kg5 Qg7 64.Kf5 Qf7 65.Kg4 Qe6 66.Kf3 Qc6 67.Ke2 Qe4 68.Kd2 Qd3 69.Kc1 Qe3 70.Kb1 Qe1 71.Ka2 Qa5 72.Kb1 Qe1 73.Kc2 Qe4 74.Kc1 Qe3 75.Qd2 Qg1 76.Kb2 Qh1 77.Kc2 Qe4 78.Kc1 ½–½. yzerman123 (2185) – guerrer (2020), gameknot.com, 2015.

3.Bb2 a4

4.a3 c6 5.Nf3 cb5 6.e3 Bd7 7.Be2 e6 8.0–0 (8.Nc3!?+=) 8...Nf6= 9.Re1 g6 10.Bd3 Bg7 11.Qe2 Qb6 (11...0–0 12.Bb5 Qc7 13.Bd7 Nbd7 14.Nc3=) 12.Nc3 The backward pawn on b5 becomes a target 12...b4 (better 12...0–0=) 13.ab4+– Qb4 14.Reb1 Qe7 (14...Qg4+–) 15.e4 (better 15.Ba3 Qd8 16.Rb7+–) 15...de4+= 16.Ne4 (worse 16.Be4 Ne4 17.Qe4 Bc6=+) 16...0–0 17.Nf6 (17.Ba3 Qd8 18.Bf8 Qf8+=) 17...Bf6= 18.Ne5 (18.Ba3 Qd8 19.Bf8 Ba1 20.Ba3=+ (worse 20.Ra1 Qf8 21.Ne5 Bc6–/+)) 18...Bc6=+ 19.f4 (19.Qe3 a3 20.Bd4 Ra5=+) 19...Rd8 (19...a3 20.Ra2–+) 20.Be4? (20.Qe3!?=+) 20...Be4 (20...a3 21.Bc3 Ra4 22.Bf3–+) 21.Qe4 Nd7?? (21...a3 22.Bc3 Nc6 23.Rb5–+) 22.d3? (better 22.Ba3!? Qe8 23.Rb7=) 22...Ne5 23.fe5 Bg7 24.Qh4?? (better 24.Ba3 Qc7 25.d4–+) 24...Qh4–+ 25.Rf1 Qh5 (better 25...Qb4 26.Ba3 Qd4 27.Kh1 Be5 28.Rae1–+) 26.Rf3 Be5 27.Rh3 Qf5 (27...Qe2 28.Be5 Qe5 29.Rc1–+) 28.Rf1 Qg5 (28...a3 29.Rf5 ab2 30.Rf1 Ra1 31.Kf2 Rf1 32.Ke2 b1Q 33.d4 Rd4 34.Rh7 Qe1) 29.Bc1 Qe7 30.Bh6 Qc5 (30...a3!? 31.Rhf3 Qc5 32.Be3 Qc2 33.R1f2 Qb1 34.Rf1–+) 31.Kh1 Qc2 (better 31...a3 32.d4 Qc4 33.Rd3–+) 32.Rhf3 f5 (better 32...a3!? 33.Rc1 Qb2 34.Be3–+) 33.Bf4 Bf4 34.Rf4 Qd3 35.R4f3 Qd7 (35...Qe2 36.h4 Rd1 37.Kg1 a3 38.Rf4 a2 39.Rd1 Qd1 40.Kh2 a1Q 41.Rf5 Qg1 42.Kh3 ef5 43.Kg3 Qad4 44.h5 Ra3) 36.h4 h5 (36...a3 37.Ra1 Qd4 38.Raf1 a2 39.Kh2 Qe5 40.Rg3 Ra3 41.Kg1 Qg3 42.h5 Rd2 43.Rf2 a1Q 44.Rf1 Qg2) 37.g3 Kf7 (37...a3 38.Kh2 a2 39.Kg1 a1Q 40.Re3 Qdd4 41.Kg2 Qe3 42.Rd1 Qd1 43.Kh2 Ra2 44.Kh3 Qg4) 38.Kg2 Re8 (38...a3 39.Kh3 a2 40.Kh2 a1R 41.Kh3 Rf1 42.Rf1 Ra2 43.Rc1 e5 44.Rg1 f4 45.g4 Qd3 46.Rg3 Qg3) 39.R3f2 a3 40.Re2 a2 41.Rff2 a1Q 42.Rd2 (42.Rf1 Qd5 43.Kg1 Qf3 44.Ree1 Qd4 45.Kh2 Ra2 46.Re2 Re2 47.Rf2 Qdf2 48.Kh3 Q2g3) 42...Qd2! 43.Rd2 (43.Rd2 Qe1 Decoy) 43...Ra2 44.Rc2 (44.Rf2 Rf2 45.Kf2 Qb2 46.Kf3 Rd8 47.g4 Rd3 48.Kf4 fg4 49.Kg5 Qc1) 44...Rc2 45.Kf3 Qc3 (45...Qd4 46.g4 Qf2) 46.Kf4 Ra2 (46...e5 47.Kg5 Qe3) 47.Kg5 (47.g4 fg4 48.Ke4 Ra4) 47...Ra3 (47...Qe3) 48.Kh6 Qg3 (48...Rh8 49.Kg5 Qg3) 49.Kh7 Kf6 50.Kh6 Rh8 0–1. alessandrocarvalhaes (1835) – RyanGiggs (1955), lichess.org, 2020.

4.c4 dc4 (4...e6 5.cd5 ed5 6.a3=) 5.e4 c6 (5...Nf6 6.Qc2=) 6.Bc4 cb5 (6...Nf6 7.Qc2=) 7.Bb5 Bd7 8.Na3 (8.Qe2 Bb5 9.Qb5 Qd7=) 8...e6 9.Nf3 Nf6 10.Qe2 Be7 (10...Bb5 11.Nb5 Be7 12.Rc1=) 11.0–0 (11.Rb1 0–0+=) 11...Na6 (11...0–0 12.Rab1+=) 12.Bd7 Qd7 13.Ne5 Qd8 14.Qb5 (14.Qb5 Kf8 A) worse 15.Qb7 Nc5 16.Qb5 Rb8–/+ (16...Nfe4 17.d4 Na6 18.Qa4+–; worse 16...Nce4 17.Nc6 Qd5 18.d3=); B) 15.d3+=). Luzuriaga,Norberto Horacio – Thomas,Donald, Tiger SC, 1999.

4.e3 Nf6 5.Nf3 e6 6.a3 Be7 7.c4 0–0 8.Nc3 dc4 9.Bc4 c6 10.Na4 cb5 11.Bb5 Qa5 (11...Bd7 12.Nc3+=) 12.Nc3 Ne4 (12...Bd7 13.a4+–) 13.Bd3+– (13.Ne4?! Qb5 14.Rb1 Qd3=) 13...Nc5 14.Qc2 (better 14.Bc2!?+–) 14...Nd3= 15.Qd3 Rd8 16.Qc2 Qa6 17.h4 Nc6 18.Ng5 Bg5 (better 18...f5!? 19.Nf3 Na5=) 19.hg5+– g6?? (better 19...Qd3 20.Qd3 Rd3+–) 20.Ne4+– Nb4 (20...h5 21.gh6 e5+–) 21.Nf6 Kf8 22.ab4 Qa1 23.Ba1 Ra1 24.Ke2 Rh1 (24...b6 25.Qc7 Ba6 26.Kf3 Rd3 27.Rh7 Re3 28.de3 Bb7 29.Qb7 Ra2 30.Rf7) 25.Qc7 Rd2 (25...Re1 26.Ke1 Re8 27.Qc5 Kg7 28.Ne8 Kg8 29.Nf6 Kg7 30.Qc8 h6 31.Qg8) 1–0. GuestMGJK – GuestYMKK, freechess.org, 2019.

4.Nf3 Bd7 5.e3 e6 6.Be2 Nf6 7.0–0 Be7 8.Be5 c5 (8...0–0 9.c4=) 9.c4+= dc4 10.Bc4 Qb6 11.Nc3 0–0 12.Na4 Qa5 13.Nc3 Nd5 (13...Bc8!?+/–) 14.Bd5+– ed5 15.Nd5 Bd8 16.Bd6 (16.a4 Be6 17.Bc3 Qa7+–) 16...Re8 17.Bc5 Bb5 18.Bb4 Qa6 19.Re1 Nc6 20.Bc5 b6 21.Bd6 Bc4 22.e4 Bd5 (22...Re6 23.Bg3+–) 23.ed5 Re1 (23...Ne7 24.Qc2 Rc8 25.Qf5+–) 24.Qe1 Bf6 25.dc6 Ba1 26.Qa1 Qa2 (26...Qd3 27.Qe5 Qc2 28.c7 Qc1 29.Qe1+–) 27.Qa2 Ra2 28.Kf1 Ra1 (28...f6 29.d4+–) 29.Ke2 (29…Ra8 30.c7+–) 1–0. b4_player (1980) – bkr13 (1870), GameColony.com, 2002.

4.Nf3 e6 5.a3 c5 (5...Nf6 6.e3=) 6.bc6 Nc6 7.e3 Nf6 (7...Qb6 8.Ra2=) 8.c4 (8.Bb5 Bd6=) 8...Be7 (8...Bd6 9.Nc3=) 9.cd5 Qd5 (9...ed5 10.Bb5=) 10.Nc3+= Qb3 11.Qc1 0–0? ( 11...Ra5!?+=) 12.Nb5+– Qd5 13.Nc7 Qa5 14.Na8 Bd7 15.Bc3 Qa8 16.Qc2 (16.Qb2 Rc8+–) 16...Rc8+/– 17.Bb5 (17.Qb2 Rc7+/–) 17...Nb4 18.ab4 Bb5 19.Nd4 Bd7 20.b5 b6 (20...a3 21.Qd3+/–) 21.0–0 (21.Nc6 Bc6 22.Ra4 Qb7 23.bc6 Qc6+/–) 21...a3 22.Qb3 (22.Qb1+/–) 22...Ne4 ( 22...Qd5!? 23.Qb1 e5=) 23.Bb4+– Bb4 24.Qb4 Qd5 25.Rfc1 e5?? ( 25...Rc1 26.Rc1 e5+–) 26.Rc8 Bc8 27.Nc6 (27...Qd2 28.Qe4+–) 1–0. Gross – Hauswald,Helfried, corr ICCF EU–ch GT131, 1976.

4.Nf3 Nf6 =.

4.a3 Bd7

5.e3 Ra5 6.c4 dc4 7.Nc3 Bb5 8.Rb1? (better is 8.Nb5!? Rb5 9.Qa4=) 8...Ba6–/+ 9.Na4 Nf6 10.Bc3 Rd5 11.Nb2 b5 12.a4 c6 13.Nf3 Ne4 14.Bd4 e5! 15.Be5 (15.Be5 c3 Decoy; 15.Ne5 Rd4 Combination) 15...Nd7 (15...c3 16.Nd3 b4 17.Bd4–+) 16.Bg3? (16.Bd4 Bc8+=) 16...Be7 (16...c3 17.Qc2 Ng3 18.hg3 cb2 19.Rb2–+) 17.Be2? (17.Qc2 Ndc5+=) 17...h5?? (17...c3 18.ab5 cd2 19.Kf1 Bb5 20.Bb5 cb5 21.Qb3–+) 18.h4?? (better is 18.Nd4!? Bc5 19.Bf3 Ng3 20.hg3+=) 18...Ng3 19.fg3–/+ c3! 20.Nd3 Nf6 21.dc3 0–0 22.0–0 Ne4 23.Qc2 Ng3 24.Nf4 Ne2 25.Qe2 Rd7 26.ab5 Bb5 27.c4 Ba6 0–1. typ48 – libero81, kurnik, 2012.

5.e3 c6 6.c4 (6.bc6 Nc6 7.Nf3 Nf6=) 6...dc4=+ 7.Bc4 cb5 8.Ba2 (8.Bd5 Bc6 9.Bf3 Qd3=+) 8...e6 9.Nf3 Nc6 10.Ne5 (10.0–0 b4 11.d3 b3 12.Bb3 ab3 13.Qb3 Na5–+) 10...Ne5 11.Be5 Nf6 12.Bc3 (12.d4 b4 13.0–0 b3 (13...ba3?! 14.Nc3–/+) 14.Bb3 ab3 15.Qb3 Bc6–+) 12...Be7 13.0–0 (13.Bf6 Bf6 14.d4 0–0–/+) 13...0–0 14.d3 Bc6 15.Nd2? ( 15.Qe2–/+) 15...Qd3–+ (15...Ba3 16.Bf6 Qf6 17.Be6–+) 16.Bb4 (16.Bf6 Bf6 17.Bb1 Qf1 18.Kf1 Ba1 19.Bh7 Kh7 20.Qa1 Rfd8–/+) 16...Bb4 17.ab4 Rfd8 18.Nf3 Qg6 ( 18...Qc3 19.Qe1 Qe1 20.Rfe1 Bf3 21.gf3 Rd2–+) 19.Nh4 (19.Qe2–+) 19...Rd1 20.Ng6 Rf1 (20...hg6?! 21.Rfd1 g5 22.Kf1=+) 21.Rf1 hg6 22.Rd1 Nd5 23.Bd5 Bd5 24.Ra1 Rc8 25.f3 Rc4 26.e4 Bc6 27.Rb1 Rc2 (28.Ra1 Rb2–+) 0–1. Schmeding,Irene – Lueth,Guenter, Bahn–chS Bernkastel–Kues, 1995.

5.e3 c6 6.bc6 bc6 7.c4 e6 8.cd5 cd5 9.Nf3 Nf6 10.Be2 Be7 11.0–0 0–0 12.Nc3 The isolani on a4 becomes a target 12...h6 (12...Ra5 13.Bd3=) 13.Ne5+= Bd6 14.Nd7 Nbd7 15.Nb5 Qb8 16.g3 Be5 17.Be5 (17.d4 Bd6=) 17...Qe5 (17...Ne5 18.Rb1=) 18.d4+= Qf5 19.Nc3 (19.Rb1 Qh3+=) 19...Qh3 (19...Nb6 20.Bb5=) 20.Na4+= h5 (20...Rfb8 21.Nc5 Nc5 22.dc5+=) 21.Bf3 (21.Nb2 Ng4 22.Bg4 hg4+–) 21...Ng4+= 22.Bg4 hg4 23.Nc3 f5 24.Ne2 g5 25.f4 Kf7 (25...gf3 26.Rf3 Nb6 27.Qd3+=) 26.fg5+– Rh8 (26...Qh5 27.Nf4 Qg5 28.a4+–) 27.Rf2 (better 27.g6 Ke7 28.Rf2+–) 27...Kg6?? (better 27...Qh5+–) 28.Nf4+– Kg5 29.Nh3 Rh3 (29...gh3 30.Qf3 Nf6 31.Rb2+–) 30.a4 (30.Qc1 Kf6 31.Qc6 Rd8 32.Rf5 Kf5 33.Rf1 Kg5 34.Qe6 Rf8 35.Qd5 Kg6 36.Qe4 Kg5 37.Rf8 Nf8 38.Qf4 Kg6 39.Qg4 Kf7 40.Qh3 Ke7+–) 30...Nf6 31.a5 Ne4 32.Rb2 Rah8 (32...Rh7 33.Qf1+–) 33.a6 Ng3 (33...R3h7+–) 34.hg3 (34.a7 Ne4 35.Qe1 Ra8+–) 34...Rg3 (34...Rh1 35.Kf2 R8h2) 35.Kf2 (35.Rg2 Rgh3 36.Kf2 Kf6+–) 35...Rf3 (35...Rgh3 36.Qg1 Rh2 37.Qg2 f4 38.ef4 Kf4+–) 36.Ke2 Rh2 (36...Rg3 37.Rb6 Kf6 38.Qe1+–) 37.Kd3 Rb2 38.a7 g3 39.Qf3 g2 1–0. Abdullaevich (1935) – wRcLD (1915), lichess.org, 2020.

5.e3 Be6 6.Nc3 d4 (6...Nf6 7.Be2=) 7.Ne4 Bf5 (7...Bd5!? 8.Ng3 d3+=) 8.Ng3+– Be6 9.Bd4 h6 10.c4 Nd7 11.Nf3 Bg4 12.Be2 b6 13.Ne5 Be2 14.Qe2 Ne5 15.Be5 Qd7 16.0–0 f6 (16...e6+–) 17.Qh5 Kd8 18.Bd4 (18.Qf7 fe5 19.Qf8 Qe8+–) 18...e5 (18...e6 19.Ne4+–) 19.Bc3 (19.Be5 Qe6 20.Bc3 Qc4+–) 19...Bd6 20.Qf3 Qc8 21.d4 ed4 22.ed4 Be7 (22...Bg3 23.Qg3 Qd7 24.Rae1+–) 23.Qd3 (better 23.Nf5!? Ra7 24.Ng7 Qd7+–) 23...Bd6 24.c5 Bg3 25.hg3 (25.Qg3 Qd7+–) 25...bc5? (better 25...Ne7+–) 26.dc5 Qd7 (26...Ke7+–) 27.Qc4 (better 27.Qe4 Ne7 28.Rad1 Ra7 29.Rd7 Kd7+–) 27...Kc8 28.Rad1 Qe8 29.b6 (29.Qg4 Kb8 30.Qg7 Ne7 31.Bf6 Rg8 32.Qe7 Qe7 33.Be7 Ra5+–) 29...Qc6 (29...Kb7 30.Rfe1 Ne7 31.Re6+–) 30.bc7 Qc7 (30...Kc7 31.Qf7 Ne7 32.Qe7 Kc8 33.Qg7+–) 31.Bb4 (31.Qe6 Kb7 32.Rd7 Rc8 33.Rb1 Ka7 34.Qb6 Ka8 35.Qa6 Qa7 36.Qa7) 31...Ne7+– 32.Qf7 (32.Qe6 Kb8 33.Rb1 Ra7 34.Ba5 Qb7 35.Qe7 Ka8 36.Rb7 Rb7+–) 32...Nc6 (32...Kb8+–) 33.Qc7 (better 33.Qe6 Kb8 34.Rd7+–) 33...Kc7+= 34.Rfe1 Nb4 35.ab4 Kc6 36.Re7 (36.Rd6 Kb5 37.Rb6 Kc4+=) 36...Rhg8 (36...Rhb8!? 37.Rg7 Rb4=) 37.Rd6+= Kb5 38.Rb6 Kc4 39.Re4 Kd5 40.f3 Rad8? (better 40...Rgd8 41.Re1 a3=) 41.Ra6+– f5 42.Ree6?? (42.Rf4!? Rgf8 43.g4 fg4 44.Rg4 h5 45.Rg7 Ra8+–) 42...Kc4?? (better 42...Ra8 43.Rab6 Rgb8 44.Rb8 Rb8 45.Rd6 Kc4=+) 43.Ra4+– Kb3 (43...Rge8 44.Re8 Re8 45.Ra7 Kb4 46.Rg7 Kc5 47.Rg6+–) 44.Rea6 Rc8 45.c6 (better 45.Kf2+–) 45...g5?? (better 45...Rc6! 46.Rc6 Ka4+=) 46.b5+– g4 (46...Rgd8 47.Ra7+–) 47.fg4 fg4 48.Rf4 (48.Ra8 Ra8 49.Ra8 Ra8+–) 48...Rg6 (48...Rg5 49.Ra1 Kb2 50.Rff1+–) 49.Rf1 (49.Raa4 h5+–) 49...Kc4 (49...Rgg8 50.Raa1+–) 50.Rb1 Kc5 (50...Kd3 51.b6 Rcc6 52.Ra3 Kc2 53.b7+–) 51.Ra7 (better 51.b6 Rcc6 52.Ra5 Kd4 53.b7+–) 51...Rg7 (51...Rg5+–) 52.Rg7 h5 53.Rg5 Kb6 54.Rh5 (better 54.Ra1 Kc7+–) 54...Rc7 55.Rg5 (55.Ra1 Rc8 56.Ra6 Kc7 57.Rh7 Kd6 58.c7 Kc5 59.Rh5 Kc4 60.Rc6 Kd4 61.b6 Rg8 62.Rd6 Kc3 63.b7 Rc8 64.Rc6 Kd4 65.bc8Q Kd3 66.Qd7 Ke4 67.Re6) 55...Ka5 56.Rg4 (56.b6 Ka6 57.bc7 Ka7 58.Ra5) 56...Kb6+– 57.Rg5 (better 57.Ra4 Rc8+–) 57...Rc8 58.Ra1 Rc7 59.Ra6 1–0. Atotheking – maxiperw, lichess.org, 2019.

4.a3 Nd7

5.e3 Nb6 6.Nf3 Nf6 7.Be2 Bf5 8.0–0 e6 9.d3 Bg6 10.c4 dc4 11.dc4 Bc5 12.Nbd2 0–0 (12...Qe7 13.Qc1=) 13.Bd4 Qe7 14.Qc1 Rfd8 15.Qc3 Ne8 16.Ne5 f6 (16...Bd4!? 17.ed4 Bf5+=) 17.Ng6+– hg6 18.Rfd1 Nd7 19.Ne4 e5 (19...Bd4!? 20.ed4 f5+–) 20.Bc5+– (worse 20.Nc5 ed4 21.ed4 Nc5–/+ (21...Qe2?! 22.Re1 Qg4 23.h3=)) 20...Nc5 21.Qb4 b6 22.Nc5 Qc5 23.Qc5 bc5 24.Rac1 Kf7 25.Rd5 Rd5 (25...Ke7!?+–) 26.cd5+– f5 (26...Ke7 27.Rc5 Kd6 28.Rc6 Kd5 29.f3+–) 27.Rc5 Ke7 28.Rc6 Kf7 29.f3 Ra7 30.Bc4 (30.Ra6 Rb7+–) 30...Ke7 31.Re6 (better 31.Rg6 Rb7 32.Re6 Kf8 33.Re5+–) 31...Kd7?? (31...Kf8+–) 32.b6 Ra5 (32...cb6 33.Bb5 Kc7 34.Be8 Kd8+–) 33.b7 (33.b7 Nf6 34.b8Q Rd5 35.Bd5 f4 36.Qf8 fe3 37.Qf7 Kd8 38.Bb7 e2 39.Qe7; 33.Rg6?! cb6 34.e4 Rc5+–) 1–0. BeepBeepImAJeep (2795) – Milber (2660), lichess.org, 2016.

5.e3 (5.Nf3 Ngf6=) 5...Nb6 (5...e5 6.d4 e4 7.c4=) 6.Nf3 Nf6 7.Be2 g6 (7...e6 8.Be5=) 8.0–0 Bg7 9.Ne5 (9.Be5 Nbd7 10.d4 Ne5 11.Ne5 Nd7=) 9...0–0 10.c4 Ne4 (10...dc4 11.Nc4 Nc4 12.Bc4=) 11.Qc2 (11.d3 Nc5=) 11...Nc5 12.cd5 Nb3 (12...Qd5 13.Bf3 Bf5 14.Qc3=) 13.Ra2 Nd5 (13...Qd5 14.Nf3 (worse is 14.Qc7 Nd2 15.Nd2 Qa2–/+) 14...e5 15.Nc3=) 14.Nf3 Bb2 15.Rb2 Nb6 16.d4 Bf5 17.Bd3 Bd3 18.Qd3 Qd5 (18...Qd6 19.Nfd2+=) 19.Ne5 (19.Rc2 Rfc8+=) 19...Rfd8 20.Rd1 f6 21.Nc3 Qe6 22.Nf3 Qc4 23.Na4 (23.Rc2 Qd3 24.Rd3 Na1=) 23...Qd3 (23...Nd4 24.ed4 Qd3 25.Rd3 Ra4 26.Rbb3+=) 24.Rd3 Nc1 25.Nb6 Nd3 26.Na8 Nb2 27.Nc7 Rc8 28.b6 Nc4 29.Kf1 Nb6 30.Nb5 Rc1 31.Ke2 Rc2 32.Ke1 Rb2 33.Nc3 Rb3 (33...Rb3 34.Ne4 Ra3–+) 0–1. Hatziapostolidis,Efstalotis – Magnusson,Joergen (2255), IBCA–ol blind, 1988.

4.a3 Nf6

5.e3 e6 (--> 4.e3 e6 5.a3 Nf6).

5.Nf3 c6 6.bc6 bc6 7.e3 e6 8.d4 Be7 9.Nbd2 0–0 10.c4 Ba6 (10...Nbd7 11.Bd3=) 11.c5 (11.Qa4!? Nbd7 12.Qc2+= (12.Qc6?! Qb8 13.Bc1 Rc8=+)) 11...Bf1= 12.Nf1 Nbd7 13.N1d2 Re8 14.0–0 Bf8 15.Re1 e5 16.de5 Ng4 17.Bd4 Nc5 18.h3 (18.Qc2 Nd7 19.Qc6 Nde5 20.Ne5 Ne5 21.Be5 Re5=) 18...Nf2=+ 19.Kf2 Nd3 20.Kg1 c5 (20...Ne1 21.Ne1 c5 22.Bc3=+) 21.Bc3 (21.Re2 cd4 22.ed4 Nf4=) 21...Ne1=+ 22.Ne1 Rb8 (22...Qd7!?=) 23.Qa4+= c4 24.Nef3 (24.Qd1 Bc5 25.Nc2 Qb6+=) 24...Bc5 (24...Ra8!? 25.Qc2 Ra3 26.Ra3 Ba3+=) 25.Bd4+– Be7 (25...Ra8!? 26.Qc6 Bd4 27.ed4 Re6+=) 26.Qc2 Bg5 27.a4 h6 28.a5 Ra8 29.Bc3?? (better 29.Ng5 Qg5 30.e4 de4 31.Nc4+–) 29...Qe7? (better 29...Be3 30.Kh1 Bc5=) 30.Qf5 (30.Qf5 Be3 31.Kh2=) 1–0. alessandrocarvalhaes (1890) – karimovClub (1930), lichess.org, 2020.

4.e3 c6

5.a3 e5 6.Be5+– Nf6 7.Bb2 (7.Nf3 Nbd7+–) 7...Bd6+= 8.Nf3 Qe7 (8...0–0 9.Be2+=) 9.Nc3 (9.Be2 0–0+=) 9...0–0 10.bc6 (10.Be2 Ne4+=) 10...bc6 11.Bd3 (11.Nd4 Qb7 12.Qc1 Qe7+=) 11...c5 (11...Ne4 12.Be4 de4 13.Nd4+=) 12.0–0 (12.Nb5 Nc6+–) 12...c4 13.Be2 Nc6 14.Nb5 (14.d3+–) 14...Bc5 (14...Rb8 15.Bf6 Qf6 16.Nd6 Qd6 17.c3+=) 15.Rb1 (15.Bf6!? Qf6 16.Nc7+–) 15...Rd8 (15...Rb8 16.Nbd4 Nd4 17.Nd4+=) 16.d3+– Ba6 17.Nbd4 Nd4 (17...Rac8+–) 18.Bd4 (18.Nd4 Qf8+–) 18...Bd4 (better 18...Ba3!? 19.Ra1 Ne8=) 19.Nd4+– Qa3 20.Bf3 (better 20.Ra1!? Qc5 21.Ra4+–) 20...Qc5 (20...Qc3 21.Ra1 cd3 22.cd3 Qd3 23.Re1=) 21.dc4 (21.Ra1!? Bb5 22.Qe2=) 21...Bc4=+ 22.Re1 a3 23.Ra1 (23.Rb7 Rd7 24.Rd7 Nd7=+) 23...a2 24.Nb3 Qb4 25.Qd4 Rdb8 (better 25...Ne4=+) 26.Red1? (better 26.Nd2!?=+) 26...Bb3–/+ 27.cb3? (27.Qb4 Rb4 28.cb3 Rb3–/+) 27...Qb3 (27...Qd4!? 28.Rd4 Rb3 29.Rdd1–+) 28.g4 (28.Rdc1 Rc8 29.Rd1 Rc2–/+) 28...h6 (28...Rb4 29.Qc5–+) 29.h4 (29.h3 Ra4 30.Qe5 Qb2–+) 29...Ra4 30.Qe5 White plans g5 30...Qb2 (30...Ng4 31.Qg3 Nf6 32.Qe5–+) 31.Qg3 Ne4 (better 31...Rbb4 32.g5 Ne4 33.Be4 Re4–+ (33...de4?! 34.Kg2–/+)) 32.Qc7?? (better 32.Be4 de4 33.g5–+) 32...Nf6 (32...Qf2 33.Kh1 Qf3 34.Kg1 Qe3 35.Kh1 Nf2 36.Kg2 Qh3 37.Kf2 Rb2 38.Qc2 Rf4 39.Kg1 Rg4 40.Kf2 Rg2 41.Ke1 Qh1) 33.g5?? (33.Qg3 Rbb4 34.g5–+) 33...hg5–+ 34.hg5 Qb6?? (better 34...Ne4 35.Be4 de4–+ (35...Re4?! 36.Ra2 Rg4 37.Kh1=+)) 35.g6?? (better 35.Qb6 Rb6 36.gf6+–) 35...Qc7–+ 36.gf7 Qf7 0–1. FeegLood (2855) – gnejs (2745), lichess.org, 2016.

5.c4 Bf5 6.Nc3 e6 (6...a3!? 7.Bc1 Nf6=) 7.Na4 cb5 8.cb5 Nf6 9.Be2 h6 10.Nf3 Bd6 11.0–0 0–0 12.Nd4 Qc7? (12...Bh7 13.f4+=) 13.g3?? (better 13.Nf5 ef5 14.Bf6 gf6 15.Kh1+–) 13...Bg6 14.b6 Qd7 15.Bb5 Qe7 16.a3 h5 (16...Nbd7 17.f4=) 17.Nf3 (17.f4 h4+–) 17...Be4 18.d3 Bf5 19.Bf6 Qf6 20.d4 (20.Nd2!?=) 20...Bg4 21.Be2 (21.Kg2 Ra5 22.Rb1 Rc8–/+) 21...Ra4–/+ 22.Qa4 Bf3 23.Bf3 Qf3 24.Qd1 Qe4 (24...Qd1!? 25.Rfd1 Nc6–/+) 25.Qh5=+ g6 (25...Nd7 26.Rfb1=+) 26.Qe2= Kg7 27.f3 Qf5 28.e4 Qh3 29.e5 Be7 30.Qg2 (30.Rfc1 Nc6 31.Qd2 Ra8=+) 30...Qh5 (30...Qg2 31.Kg2 Nc6 32.Rfc1=+) 31.g4 Qh4 32.Qg3 Qg3 33.hg3 Nc6 34.Rfd1 f5 (34...Ra8 35.Rac1 f6 36.Rc6 bc6 37.Rc1 fe5 38.Rc6 ed4 39.Re6 Ba3 40.b7–+) 35.f4 (better 35.gf5 gf5 36.Rd3=) 35...fg4–/+ 36.a4 Ra8 (better 36...g5!? 37.Rdc1 gf4 38.gf4 Bb4–/+ (38...Rf4?! 39.Rc6 bc6 40.b7+=)) 37.Rdc1=+ Ra6 (better 37...Bd8 38.Rc6 bc6=+) 38.a5 (38.Rc6 bc6 39.a5=+) 38...Ra5–/+ (38...Nd4 39.Rc7 Kf8 40.Rb7+–) 39.Ra5 Na5 40.Rc7 Kf8 41.Rc8 Kf7 42.Ra8 Nc4 43.Ra7 Nb6 44.Rb7 Nc4 45.Kf2 Ke8 (45...Nd2 46.Ra7–+) 46.Rb8 Kf7 47.Rb7 Ke8 48.Rb8 Kf7 (better 48...Bd8–/+) 49.Rb7= ½–½. Atotheking (1710) – Predator_X (1800), lichess.org, 2020.

5.Nf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.a3 Nd7 9.d4 Ngf6 10.c4 dc4 11.Bc4 Ne4 12.Nc3 Qa5 13.Rc1 e6 14.0–0 Ba3 15.bc6 bc6 16.Ne4 Bb2 17.Rb1 a3 ( 17...Be4!? 18.Rb2 Qc3 19.Nd2 Qb2 20.Ne4–+) 18.Bd3 Qd5 19.Qc2 0–0 20.Nfd2 Nb6 21.f3 Rfc8 22.Nc4 Nc4 23.Bc4 Qa5 24.Ba2 c5 25.d5 c4 26.de6 fe6 27.f4 Be4 28.Qe4 Qd5 29.Qc2 Qc5 30.Kf2 g6 31.g5 Kf7 32.Rbd1 Ke7 33.Rd2 c3 34.Rd4 Qf5 35.Re4 Ra6 36.Kg3 Rd6 37.Rf2 Rcd8 38.h4 R8d7 39.h5 Kf7 (39...gh5 40.Re6 Qe6 41.Be6 Re6 42.Qh7 Kd8 43.Qg8 Re8 44.Qb3=) 40.h6 Rd5?? ( 40...Rd8–+) 41.Qa4=+ Ke7 42.Qb4 Ke8 43.Bb3 Kd8 44.Qb6 Ke7 45.Bd5 Qd5 46.Rd4 Qb7 47.Qc5+/– Ke8 48.Qe5 Rd4 49.Qh8 Kd7 50.Qd4 Qd5 51.Qa7 Kd6 52.Qb8 Kd7 53.Qa7 Kd6 54.Qb8 (54.Qh7? a2 55.Rf1 Qd3–+) ½–½. Baxa,Ottokar – Peuchert,Wolfgang, Passau op 7th, 1999.

4.e3 Nd7

5.c4 Nb6 A) 6.cd5 A1) 6...Nd5 7.e4 Ndf6 8.Qc2 e6 9.Nf3 Bd7 10.Be5 c6 11.Nc3 a3+= 0.41; A2) 6...Nf6 A21) 7.Be2 Nbd5 8.Nf3 e6 9.0–0 Bd6 10.Be5 0–0 11.d4 (11.Nc3 Be5= 0.19) 11...Qd7= 0.25; A22) 7.Nf3 Nbd5 8.Bc4 Nb6 9.Be2 Bf5 10.0–0 e6 11.d3 Be7+= 0.37; A3) 6...Qd5 7.Bd4 Qd6 8.Nc3 e5 9.Bb6 Qb6 10.Na4 Qa5 11.Nb2 e4+= 0.28; B) 6.c5 Nd7 (6...Nc4 7.Bc3 e5 8.d4 Bd7 9.Bc4 dc4 10.Na3 ed4 11.Bd4 Be6+= 0.31) 7.Qc2 Ra7 8.Nf3 Ngf6 9.Bd4 e6 10.Bd3 Qe7 11.c6 Nc5+= 0.56.

5.c4 dc4 6.Bc4 (6.Na3 e5 (6...Ngf6 7.Nc4 e6 8.Nf3 Bc5 9.a3 Be7 10.d4 Nd5 11.Bd3 0–0+= 0.53; 6...c3 7.Bc3 Ngf6 8.Nc4 Nc5 9.d3 Bg4 10.f3 Bd7 11.d4 Nd5+= 0.47; 6...e6 7.Nc4 Ngf6 8.Nf3 Be7 9.Be2 a3 10.Bd4 0–0 11.0–0 Nd5+= 0.28; 6...Nc5 7.Bc4 Nd3 8.Bd3 Qd3 9.Nf3 Bf5 10.Rc1 e5 11.Ne5 Qd5= –0.09) 7.Nc4 e4 8.d3 Bb4 9.Nd2 Ngf6 10.a3 Ba5 11.Rc1 0–0= –0.19) 6...Nb6 (6...e5 7.Qh5 Nh6 8.a3 Bd6 9.Nf3 Qe7 10.Nc3 A) 10...Nf6 11.Qg5 0–0= –0.03 (11...Nf5= 0.03); B) 10...Nb6 11.Bd3 Bg4= –0.25; 6...Ngf6 7.Nf3 Nb6 8.Be2 e6 9.0–0 Bd6 10.Be5 0–0 11.d4 Nbd5+= 0.31; 6...e6 7.Nf3 Ngf6 8.0–0 Bd6 9.d4 a3 10.Bc3 0–0 11.Qc2 Nb6= 0.25) 7.Be2 e6 (7...Nf6 8.Nf3 e6 (8...Bg4 9.0–0 e6 10.Bd4 Bd6 11.Bb6 cb6= 0.22) 9.0–0 Bd6 10.Be5 Be5 11.Ne5 Nfd7+= 0.34) 8.a3 Prevents intrusion on b4 (8.Bd4 Nd7 9.Nf3 Ngf6 10.Nc3 Bd6 11.Bf6 Nf6= 0.06) 8...Nf6 9.d4 (9.Nf3 Bd6 10.0–0 0–0 11.Be5 Be5= 0.12) 9...Qd5 Black threatens to win material: Qd5xg2 (better is 9...Bd6= 10.Nf3 0–0 11.Qc2 (11.0–0 Bd7= 0.09) 11...Bd7= 0.09) 10.Nd2 (better is 10.Nf3+= and White can hope to live 10...Qb3 11.Qc1 Bd6= 0.22) 10...Qg2–/+ 11.Bf3 Qg5 12.Rb1 Qb5 13.d5 (13.Ne2 Qd7–/+) 13...Qd7 (13...Qa6 14.de6 Be6 15.Qc2–+) 14.Bf6 (14.de6!? fe6 15.Ne2–/+) 14...gf6–+ 15.de6 Qe6 16.Qc1 Bd6 17.Ne2 Qe7 18.Nc4 Nc4 19.Qc4 Ba3 20.Bb7 Bb7 21.Rb7 Bd6 22.Ng3 Qe6–+ 23.Qb5 Kf8 24.Nf5 a3 25.Rb8 Rb8–/+ 26.Qb8 Qe8 27.Qb3 Rg8 28.Nd6 cd6 29.Qa3? Qc6–+ 30.Rf1 Ke7 31.Qa7–/+ Ke6 32.f4?? Qc1 33.Kf2 Qd2 34.Kf3 Qg2# 0–1. McGrath,Marion – Nowarra,Waltraud, Subotica ct (Women) 5th, 1967.

5.c4 e5 6.Nf3 (6.cd5 Ngf6 7.Bc4 Nb6 8.d3 Bb4 9.Kf1 Nfd5 10.Qc2 Qf6 11.Nf3 Bh3–/+ –0.84; 6.d4 dc4 7.Bc4 Nb6 8.Be2 a3 9.Bc3 e4 10.Nd2 Nf6 11.Qc2 Qd5+= –0.38) A) 6...Bd6 7.d4= (7.cd5 Ngf6 8.Nc3 a3 9.Bc1 e4 10.Nd4 0–0 11.Qc2 Nb6= –0.06) 7...a3 8.Bc3 e4 9.Nfd2 Ngf6 10.Qc2 (10.c5 Be7 11.Bb4 b6+= 0.37) 10...0–0 11.c5 Be7+= 0.31; B) 6...e4 7.Nd4 dc4 8.Qc2 Ngf6 9.Bc4 a3 10.Bc3 Ne5 11.Be2 (11.Nc6 Nd3= –0.22) 11...Bd6= –0.19.

5.c4 e6 A) 6.d4 Bb4 (6...a3 7.Bc3 Ngf6 8.Nf3 dc4 9.Bc4 Bd6 10.0–0 Nb6 11.Bd3 0–0= 0.25; 6...Ngf6 7.Nf3 a3 8.Bc3 Ne4 9.Qc2 Ndf6 10.Bd3 Nc3 11.Nc3 dc4+= 0.37; 6...Be7 7.Ba3 Ngf6 8.Be7 Qe7 9.Nf3 0–0 10.Nc3 Ne4 11.Qc2 Qb4= 0.19; 6...dc4 7.Bc4 Ngf6 8.Nf3 a3 9.Bc3 Bd6 10.0–0 0–0 11.Qc2 Nb6= 0.25) 7.Bc3 Be7 8.Qg4 Ngf6 9.Qg7 Rg8 10.Qh6 dc4 11.Nd2 Nb6= –0.06; B) 6.cd5 ed5 7.Nf3 Ngf6 8.Be2 Bd6 9.Bd4 c5 10.bc6 bc6 11.Nc3 0–0= 0.06; C) 6.Nf3 Ngf6 (6...a3 7.Bd4 Ngf6 8.cd5 ed5 9.Be2 Bd6 10.0–0 0–0 11.Nc3 Re8= 0.06) 7.cd5 ed5 8.Be2 Bd6 9.Bd4 c5 10.bc6 bc6 11.Nc3 0–0= 0.06.

5.c4 Ngf6 A) 6.Nf3 e6 (6...dc4 7.Bc4 Nb6 8.Be2 Bf5 9.0–0 e6 10.d3 Be7 11.Nh4 Bg6+= 0.31; 6...c6 7.bc6 bc6 8.cd5 Nd5 9.e4 N5f6 10.Qc2 Qb6 11.e5 Ng4+= 0.41) 7.cd5 ed5 8.Be2 Bd6 9.Bd4 c5 10.bc6 bc6 11.Nc3 a3= 0.06; B) 6.cd5 B1) 6...Nb6 7.Nf3 Nbd5 8.Be2 (8.Be5 Bf5 9.d3 Nb4 10.e4 Be6 11.Qd2 Na2+= 0.47) 8...e6 9.0–0 Bd6 10.Be5 0–0 11.d4 Qd7= 0.25; B2) 6...Nd5 7.Nf3 e6 8.Bd4 B21) 8...f6 9.e4 N5b6 10.Qc2 (10.Nc3 Bd6 11.Be2 e5= 0.09) 10...Bd6 11.Be2 e5= 0.09; B22) 8...N5f6 9.Nc3 Bd6 10.Bf6 Nf6 11.Be2 e5= –0.16; C) 6.d4 c6 (6...dc4 7.Bc4 e6 8.Nf3 a3 9.Bc3 Bd6 10.0–0 0–0 11.Qc2 Ra7= 0.22; 6...e6 7.Nf3 Bb4 8.Bc3 Be7 9.c5 Ne4 10.Bd3 0–0 11.0–0 f5= 0.25; 6...Ra7 7.Nf3 e6 8.c5 Be7 9.Bd3 0–0 10.0–0 Ne4 11.a3 Qe8+= 0.56; 6...Ra5 7.Nf3 e6 8.Bc3 Ra8 9.c5 Be7 10.Bd3 0–0 11.Nbd2 Ra7+= 0.47) 7.Nd2 cb5 8.cb5 e6 9.Bd3 Bd6 10.Ngf3 a3 11.Bc3 0–0= 0.19.

5.Nf3 Ra5 6.Bc3 (6.c4 dc4 7.Na3 Nf6+–) 6...Rb5 (6...Ra8 7.Be2+–) 7.Bb5 Bb5 8.d3 c6 (8...Nc6 9.Nbd2+–) 9.0–0 Qd7 (9...Nd7 10.Bb2+–) 10.Na3 (10.Bd4 f6+–) 10...Ba6 11.Ne5 (11.Bb4 Nf6+–) 11...Qd6+– 12.Bb2 (12.Qg4 b5 13.Qb4+–) 12...Qh6 (better 12...Nf6!?+–) 13.c4+– e6 14.Qa4 (better 14.cd5 ed5 15.e4 (15.Qa4?! f6 16.Nf3 Nd7+–) 15...de4 16.Re1+– (16.de4?! Bf1 17.Qf1 Qe6+–)) 14...Ne7?? (better 14...f6 15.Nf3 Nd7+–) 15.Nb5! Nf5 (15...cb5 16.cb5 Pinning (16.cb5 Decoy)) 16.Nc7 Kd8 (16...Ke7 17.Ba3 Nd6+–) 17.Nf7 (17.Nf7 Kc7 18.Nh6 Nh6 19.Be5 Bd6 20.Qa5 Kd7 21.Bg7+–) 1–0. GuestPCMQ – GuestSZVN, freechess.org, 2020.

5.Nf3 e6 A) 6.Bd3 Ngf6 (6...a3 7.Bd4 f6 8.Bc3 e5 9.0–0 Nh6 10.Ne1 Bd6 11.Qh5 Nf7+= –0.31; 6...Nc5 7.Be2 Nf6 8.Be5 Bd6 9.0–0 0–0 10.d4 Nce4 11.c4 dc4= 0.22) 7.0–0 Bd6 8.Nd4 Nc5 9.Be2 e5 10.Nf3 e4 11.Nd4 Qe7+= –0.34; B) 6.Be2 a3 (6...Ngf6 7.a3 Bd6 8.0–0 0–0 9.Nd4 Kh8 10.f4 Nb6 11.Nf3 Kg8= 0.09) B1) 7.Bc3 Ngf6 8.0–0 Bd6 9.d4 (9.Nd4 0–0 10.f4 Ne4 11.Bd3 Qh4+= –0.38) 9...Ne4 10.Qd3 Qf6 11.Nfd2 (11.Bd2 g5= –0.25) 11...Qh6= –0.25; B2) 7.Bd4 Qe7 8.Ne5 Ne5 9.Be5 f6 10.Bg3 Nh6 11.Nc3 Nf5= –0.06; C) 6.a3 Ngf6 7.d4 Bd6 8.c4 dc4 9.Bc4 Nb6 10.Bd3 0–0 11.0–0 Bd7+= 0.31.

5.Nf3 Ngf6 A) 6.Bd3 e6 (6...g6 7.Bd4 Bg7 8.c4 Nb6 9.c5 Nc4 10.Be2 b6 11.cb6 cb6+= 0.37; 6...Nc5 7.Be2 e6 8.Be5 Bd6 9.d4 Nce4 10.0–0 0–0 11.c4 dc4= 0.22; 6...c5 7.bc6 bc6 8.0–0 e6 9.c4 Ba6 10.Qc2 Nc5 11.Be2 Bc4= 0.00) 7.0–0 Bd6 8.Nd4 Nc5 9.Be2 0–0 10.f4 Qe7 11.a3 e5+= –0.28; B) 6.Be2 e6 (6...g6 7.0–0 Bg7 8.d4 Nb6 9.Na3 0–0 10.c4 Bf5 11.Nh4 Be6= 0.22) 7.a3 (7.0–0 a3 8.Bc3 Bd6 9.Nd4 0–0 10.d3 Re8 11.f4 Bc5+= –0.28) 7...Bd6 8.d4 (8.0–0 e5 9.Nh4 Nb6 10.Nf3 Qe7 11.d4 e4+= –0.41) 8...Nb6 9.0–0 0–0 10.Ne5 Bd7 11.Nc3 Rc8= –0.16; C) 6.c4 e6 (6...dc4 7.Bc4 Nb6 8.Be2 e6 9.0–0 Bd6 10.Be5 Be5 11.Ne5 0–0+= 0.31; 6...c6 7.bc6 bc6 8.cd5 Nd5 9.e4 N5f6 10.Qc2 Qb6 11.e5 Ng4+= 0.41) 7.cd5 ed5 8.Be2 Bd6 9.Bd4 c5 10.bc6 bc6 11.Nc3 0–0= 0.06.

4.e3 e6

5.c4 a3 6.Bc3 =.

5.c4 Nf6 6.a3 (6.Nf3 Bd6=) 6...Nbd7 7.d4 dc4 8.Bc4 Nb6 9.Bd3 Nbd5 (9...Qd5 10.Nf3+=) 10.Nf3 (10.Ne2 Ng4+=) 10...Be7 (10...Bd7 11.0–0+=) 11.0–0 Ng4 (11...0–0 12.Qc2+=) 12.Qe2 (12.e4 Nf4+/–) 12...Bd7 (12...0–0 13.Rc1+=) 13.Nc3+/– 0–0 14.Ne4 (14.Rfc1 Ngf6+=) 14...Re8 (14...c6 15.Nc5+=) 15.Rfd1 h6 (15...Bc8 16.Ne5 Ne5 17.de5+/–) 16.Nc5 Ra7 17.Bc2 Nb6 (17...c6 18.Qd3 g6 19.e4+/–) 18.Nd7 Qd7 19.Ne5 Ne5 20.de5 Qc8 21.Bd4 Ra8 22.f4 Nd5 23.Rf1 White plans f5 23...Rd8 24.Rf3 Qd7 25.Rd1 Qe8 26.f5 ef5 27.Bf5 Ba3 28.e4 Bf8?? 29.ed5+– Rd5 30.e6 Qd8? 31.ef7 Kh8 32.Rfd3 Rd6 33.Qe3 Qh4 34.g3 Qh5 35.g4 The mate threat is gxh5 35...Qf7 36.Be5 Re8 37.Rd6 Bd6 38.Qh6 Kg8 39.Qh7 Kf8 40.Bd6 cd6 41.Bg6 (41.Bg6 Qg8 42.Qh4+–) 1–0. De Visser,Arno – Ten Thije, 1987.

5.Nf3 a3 6.Bc3 Bd7 7.d4 Bd6 8.Bd3 Ne7 9.0–0 0–0 10.Ne5 Be8 11.f4 f6 12.Nf3 Nd7 13.Nbd2 c5 14.bc6 bc6 15.Qe2 c5 16.Rfb1 c4 17.Bc4 dc4 18.Nc4 Bb8 19.Bb4 Rf7 20.Na3 Nd5 21.Nc4 Nb4 22.Rb4 Bc7 23.a4 Ba5 24.Na5 Ra5 25.Rb5 Nb8 26.Ra5 Qa5 27.Qc4 Qd5 28.Qb3 Nc6 29.c4 Na5 30.cd5 Nb3 31.de6 Na1 32.ef7 Kf7 33.a5 Bb5 34.Nd2 Nc2 35.Kf2 Nb4 36.Ne4 Ke6 37.Nc5 Kd5 38.g4 Nd3 39.Nd3 Bd3 40.Kf3 Be4 41.Kg3 Kc6 42.f5 Kb5 43.Kf4 Bb7 44.e4 Kc4 45.d5 Kd4 46.h4 Ba6 47.d6 Bc8 48.a6 Kc5 49.a7 Bb7 50.d7 1–0. tyop (1805) – madera110 (1720), playok.com, 2012.

5.Nf3 Nf6 6.c4 a3 7.Bd4 c6 8.Nc3 Nbd7 9.Be2 Bd6 10.Rb1 e5 11.bc6 bc6 12.cd5 ed4 13.Nd4 cd5 14.Bf3 Ne5 15.Nd5 Nd3 16.Ke2 Nd5 17.Bd5 Ba6 18.Bc6 Kf8 19.Bb5 Nb2 20.Qc2 Qb6 21.Qf5 Bc5 22.Ne6 Ke7 23.Nc5 Bb5 24.Kf3 Rhd8 25.Rhc1 Qc6 26.Ne4 Bc4 27.Qh7 Qd5 28.g4 Ra6 29.Kg3 Rg6 30.Qh4 f6 31.g5 fg5 32.Qg4 Qe5 33.Kg2 Be6 34.Rc5 Qc5 35.Qe6 Ke6 36.Nc5 Kd5 37.Rc1 ½–½. Mroz – Przychodni, corr PL 1985–87.

5.a3 Nf6

6.c4 b6 7.Nf3 Nbd7 8.Be2 (8.Nc3 Nc5+=) 8...Nc5 (8...Bd6 9.Nc3+=) 9.0–0 (9.cd5 ed5 10.Ne5 Qd6+=) 9...Nb3 (9...Bd6 10.cd5 ed5 11.Ne5+=) 10.Ra2 Ne4 (10...Bb7 11.cd5 Bd5 12.Nc3+=) 11.d3 (11.cd5 Qd5 12.Qc2 Bb7+/–) 11...Nf6 12.Nd4 Nd4+= 13.Bd4 Be7 14.Bb2 0–0 15.Nc3 dc4 16.dc4 Qd1 17.Bd1 Bb7 18.Na4 Ne4 19.Nc3 Nd2=+ 20.Re1 Nc4 21.Bc1 Ba3 22.Ba3 Ra3 23.Ra3 Na3 24.Ne2? Nb5–+ 25.Nf4 Rd8 26.Bb3 Nc3 27.g3 Ba6 28.Ng2? c5 29.Nf4 b5 30.Bc2 b4 31.Nd3 c4 32.Nb4 Bb7 33.f4 Bf3 34.e4 Ne2 35.Kf2–/+ Nd4 36.Ba4 Bg4 37.e5? Nf3 38.Rd1? Rd1–+ 39.Bd1 Nh2 40.Bg4 Ng4 41.Kf3 h5 42.Nc2 Nh2?? 43.Kg2= Ng4 44.Kf3 Nh6 45.Ne3 c3 46.Nc2? (46...f6 47.Nd4–+; 46.Ke2–+). ZMeB4 (1670) – 0202 (1635), caissa.com, 2007.

6.c4 dc4 7.Bc4 Nbd7 8.Nc3 Nb6 9.Ba2 Bd6 10.f4 Qe7 11.Nf3 Ba3 (11...0–0!?=+) 12.Ba3+= Qa3 13.Be6 Qb2 14.Bc8 Nc8 (14...Rc8!? 15.Na4 Qb5+=) 15.Ra4+– Ra4 16.Qa4 (16.Na4?! Qb5 17.Nc3 Qa6=) 16...0–0 17.0–0 Ne4?? (better 17...Nb6 18.Qd4 Ra8+–) 18.Qe4+– 1–0. Janek – Larry, internet free game, 2017.

6.c4 dc4 7.Bc4 Be7 8.Nf3 Nbd7 9.0–0 0–0 10.Qc2 Nb6 11.Bd3 Bd7 (11...Bd6 12.h3+=) 12.Ne5+– Be8 (12...g6 13.Nc3+–) 13.f4 Bd6 (13...g6 14.Bd4+=) 14.Nc3 (14.Bd4 Qe7+–) 14...h6 (14...Ra5 15.Rf3+–) 15.Rf3 Nbd5 (15...Nh5 16.Ne4+–) 16.Na4+– Nd7 (16...Qe7 17.Qb3+–) 17.Rg3 (better 17.Nd7 Bd7 18.Rg3+–) 17...Kh8?? (better 17...Ne5 18.fe5 Be7+–) 18.Nc6! bc6 (18...bc6 19.Bg7 Mate attack) 19.Bg7 Kg8 20.Bh7 1–0. Pierre – Mirrimond, internet, 2020.

6.c4 c6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.a3 a5 5.b5 c6 6.c4 a4).

6.c4 Bd6 7.Nc3 =.

6.c4 Bd7 7.Nf3 c6 8.Nc3 Qa5 9.Ne5 Bd6 10.Ng4 Ng4 11.Qg4 Be5 (11...Rg8 12.Rc1+=) 12.f4 (12.Na4 Bb2 13.Nb2 0–0 14.bc6 Bc6+=) 12...Bf6= 13.Rb1 dc4 14.bc6 (14.Ne4 A) 14...cb5?? 15.Nf6 gf6 16.Qg7+– (16.Bf6?! Rf8+/–); B) 14...Bb2 15.Rb2 B1) 15...cb5? 16.Qg7 Rf8 17.Qg5+– (17.Qh7?! Bc6+/–); B2) 15...Kf8 16.bc6 Bc6–/+) 14...Bc6 15.Bc4 0–0 (15...b5 16.Bd3 b4+=) 16.h4 (16.0–0 Rd8 17.Rfd1 Nd7=) 16...Qf5 ( 16...Rd8=+) 17.Qf5+/– ef5 18.Rh2 (18.Nd5 Bb2 19.Rb2 Rd8 20.Ne7 Kf8 21.Nf5 Be4+/–) 18...Nd7 (18...Ra5 19.Be2+=) 19.d4 (19.Nd5 Bd5 20.Bd5 Rfb8+/–) 19...Rfe8+= 20.Kf2 Re7 ( 20...Nb6!? 21.Bd3 Rad8+=) 21.d5+/– Bd5?? ( 21...Nb6 22.dc6 Nc4+–) 22.Nd5+– (22.Bd5 Rc8 23.Na4 b5 24.Bf6 Nf6 25.Rb5 Ng4 26.Kg3 Re3 27.Bf3 Nh2 28.Kh2 Ra3+/–) 22...Re4 23.Bd3 (23...Bb2 24.Rb2+–; 23.Nf6?! Nf6 24.Be2 Ng4 25.Bg4 fg4+–) 1–0. bentengutama (1965) – hzsolt (1975), net–chess.com, 2003.

6.c4 Bd7 7.Nh3 c6 8.bc6 Bd6?? (8...Bc6 9.cd5 Nd5 10.Nc3=) 9.Qf3 (better 9.cd7 Nbd7 10.cd5 ed5 11.Bb5+–) 9...Nc6= 10.Qd1 (10.Bf6 Qf6 11.Qf6 gf6 12.cd5 ed5=) 10...Bc8 (10...e5!?–/+) 11.Bc1 (11.Nc3!?=) 11…Bg3 1–0. Adlai – Podloggy, internet, 2021.

6.c4 Nbd7 7.d4 dc4 8.Bc4 Nb6 9.Bd3 Be7 (9...Bd6 10.Nf3=) 10.Nf3+= 0–0 11.0–0 Bd7 12.Nc3 Nfd5 13.Ne4 (13.Qc2 h6+=) 13...f5 (13...Qe8!? 14.Qe2 Ra5+=) 14.Nc5+/– Qe8 15.Qe2 Bc8 16.Ne5 Bd6 17.Rac1 Rf6 18.f4 Rh6 19.e4 fe4 20.Be4 Qh5 (20...Rf6 21.Qd3 Nf4 22.Bh7 Kf8 23.Rf4 Be5 24.Rf6 Bf6 25.Bg6+/–) 21.Qh5 Rh5 22.Rf3 Ra5 23.Bd3 Rf5 (23...Rh6 24.Ne4+/–) 24.Bf5 (24.Bc3!? Nc3 25.Rc3+/–) 24...ef5+= 25.Re1 (25.Kf2 Rb5 26.Rc2 c6+=) 25...Rb5= 26.Ned3 Kf7 27.Rf2 Nf4 28.Nf4 (28.Rf4 Bf4) 28...Bf4 29.Rf4 Rb2 30.Rf3 Nd5 (30...Ra2 31.Rfe3 Nd5 32.Re5=) 31.Na4 Rd2 32.Nc3 Rd4 33.Nd5 Rd5 34.Rfe3 Bd7 35.Re5 Re5 36.Re5 Kf6 37.Re1 Bc6 38.g3 Be4 39.Kf2 b5 40.h4 h6 41.Ke3 Ke5 42.Rd1 Bd5 43.Rc1=+ c6 44.Rb1 g5–/+ 45.Rb4 Bg2 46.a4 ba4 47.Ra4 Bd5 48.Ra7 f4 49.gf4 gf4 50.Kf2 Kf5 51.Rh7? Kg6–+ 52.Rh8 Kh5 53.Ke2 c5 54.Rc8 Kh4 55.Rc5 Bb7 56.Kf2 h5 57.Rc7 Bd5 58.Rc5 Bb7?? 59.Rc7= ½–½. Markus,Robert – Husslein, corr SOK–88–18, 1988.

6.c4 Nbd7 7.d4 dc4 8.Bc4 c5 9.bc6 bc6 10.Nf3 Bd6 11.0–0 0–0 12.Nc3 The isolani on a4 becomes a target (12.Nbd2 c5+=) 12...Qa5 13.e4 White intends d5 13...e5 14.d5 (14.Rb1 ed4 15.Nd4 Qc7=) 14...cd5 (14...Nb6!? 15.Be2 cd5=) 15.Nd5+= (worse 15.ed5 Ba6 16.Ba6 Ra6=+) 15...Ne4 (15...Qd8 16.Rb1+=) 16.Re1 Rb8 17.Rb1 Ndc5 (17...Nec5!?+=) 18.Be5+– Be5 (18...Rb1 19.Qb1 Bf5 20.Bd6 Nd6 21.Ne7 Kh8 22.Nf5 Nc4 23.Rc1+–) 19.Ne5 (better 19.Ne7 Kh8 20.Ne5 Rb1 21.Qb1+–) 19...Be6?? (better 19...Rb1 20.Ne7 Kh8 21.Qb1 Nd6 22.Bf7 Bf5+–) 20.Ne7 Kh8 21.Rb8 Rb8 22.Be6 Ng5 (22...g5 23.N7c6 Qd2 24.Qd2 Nd2 25.Nf7 Kg7 26.Nb8 Ne6 27.Re6 Kf7 28.Ra6+–) 23.Nf7 (better 23.Bf7 g6 24.Qa1 Qe1 25.Qe1 Kg7+–) 23...Nf7 24.Bf7 Nd3 (24...Rd8 25.Bd5 Qc3 26.Nc6+–) 25.Nc6 (better 25.Ng6 hg6 26.Re4 Qg5 27.Qd3 Qc1 28.Qf1 Qf1 29.Kf1 g5 30.Re8 Re8 31.Be8 Kg8+–) 25...Qe1 26.Qe1 Ne1 27.Nb8 Nc2 28.Be8 Na3 29.Ba4 Nc4 (29...Kg8 30.Kf1+–) 30.Kf1 Nd2 (30...Nb6 31.Bc6+–) 31.Ke2 Ne4 32.Ke3 Nf6 33.Bc6 (33.Kf4 g6+–) 33...Ng4 34.Ke2 Nh2 (34...g5 35.h3 Nh6 36.Nd7+–) 35.f3 g5 (35...Kg8 36.Kf2+–) 36.Kf2 h5 (36...g4 37.Bb5 gf3 38.gf3+–) 37.Kg1 (37.Kg1 Nf3 38.Bf3+–) 1–0. Vekemans,D (1950) – Viers,E (2145), 32nd Avoine Open, 2017.

6.c4 Nbd7 7.Nf3 Nb6 8.Qc2 dc4 9.Ne5 Qd5 10.Be2? (better 10.Nc4!? Nc4 11.Qc4=) 10...Qg2 (10...Bd6!? 11.d4 Be5 12.Bf3 Qb5 13.de5–/+) 11.Bf3–/+ Qh3 12.Rg1 Bd6 (12...Ra5 13.Rg3 Qf5–/+ (13...Qh2?! 14.Nc4 Nc4 15.Qc4+=)) 13.Nc4?? (better 13.Ke2 Rg8 14.Nc4 Nc4 15.Bf6=+) 13...Nc4–+ 14.Qc4 0–1. wwgia (1745) – mihael1968 (1765), gameknot.com, 2014.

6.c4 Be7 7.Nc3 0–0 8.Na4 c6 9.Nc3 d4 10.ed4 Qd4 11.Nf3 Qb6 12.a4 Nbd7 13.Ke2 (13.bc6!? bc6 14.Rb1+=) 13...e5 14.d3 (14.Qc2 Re8=) 14...Nc5 (14...Ng4 15.d4 ed4 16.Qd4–/+) 15.Ke1 (15.Ne5!? Ng4 16.Ng4 Bg4 17.f3=) 15...Ng4 16.a5?? (better 16.Qc2 Nb3 17.Rb1=+) 16...Nd3!–+ 17.Qd3 (17.Qd3 Nf2 Double attack (17...Nf2 Decoy); 17.Bd3 Qf2 mate ) 17...Qf2 18.Kd1 Qb2 (18...Qb2 19.Ke1 Qa1 20.Ke2 Rd8–+) 0–1. GuestNNSN – GuestNGVS, freechess.org, 2017.

6.c4 Be7 7.Nf3 0–0 8.Nc3 Nbd7 9.Na4 dc4 10.Bc4 Ne4 11.0–0 Bf6 (11...Nd6 12.Be2+–) 12.d4 Nd6 13.Be2 Nb6 (13...Be7 14.Qc2+–) 14.Nc3 (better 14.Nb6!? cb6 15.Bd3+–) 14...Nbc4 15.Bc1 e5 16.de5 Ne5 17.Ne5 (17.Nd4 c5 18.bc6 Nc6 19.Nc6 bc6+=) 17...Be5+= 18.Qb3 (18.Bb2 Be6+=) 18...Qf6 (better 18...Ne4 19.Ne4 Ba1=+) 19.Nd5?? (better 19.Bb2 Be6 20.Qb4+=) 19...Qh6–+ Threatening mate... how? 20.f4 Ba1 21.Nc7 Rb8 22.e4 (22.Bd2 Bf6 23.Bb4–+) 22...Be6 (22...Ne4!? 23.Be3 Bf6 24.Bf3–+) 23.Qb1?? (better 23.Qb4 Ne8 24.Ne8 Rbe8 25.f5–/+) 23...Bd4–+ 24.Kh1 Bc4 25.f5 (25.Bc4 Nc4 26.Nd5 Bc5–+) 25...Qf6 (better 25...Qh4 26.g3 Qh3 27.Bc4 Nc4 28.Qd3–+) 26.Bc4 Nc4 27.Nd5 Qd8?? (better 27...Qd6–+) 28.Qd3= Nb6 (28...Be5 29.Qc4 Qh4 30.h3=) 29.Qd4+= Nd5 30.ed5 Re8 31.Bf4 (31.f6 g6+=) 31...Rc8 (31...Ra8 32.Qd3=) 32.b6 (32.f6 g6+=) 32...Rc2= 33.Bc7 (33.f6 Ree2=) 33...Qd7 34.d6? (34.f6 Ree2 35.Rg1 Rcd2=) 34...Ree2?? (better 34...Qc6!? 35.Qg1 Ree2–+) 35.Rg1 (35.Qd5 Rg2 36.Qg2 Rg2 37.Kg2 g5=) 35...h5 (better 35...Rg2! 36.Rg2 Rc1 37.Qg1 Rg1 38.Kg1 Qf5=+) 36.Qd5+= h4 37.h3 (37.Qb7 h3 (37...Qf5?! 38.d7 Qd7 39.Qa8 Kh7 40.Qf3=+) 38.Qa8 Kh7–+) 37...Rcd2 (37...Ra2 A) worse 38.Qb7 Qf5 (38...Ra3? 39.Qd5+–) 39.Qa8 Kh7=+; B) 38.Rf1 Rg2 39.Qg2 Rg2 40.Kg2=) 38.Qb7 (38.Qf3 Ra2=) 38...Qf5= The mate threat is Qxh3 39.d7 Qd7 (39...Rd7 Theme: Interference 40.Qa8) 40.Qa8 Kh7 41.b7?? (better 41.Qf3 Rb2 42.a4=) 41...Rg2!!–+ 42.b8Q Do you see the mate threat? (42.Rg2 Decoy to g2 42...Qh3 A double attack) 42...Qh3 43.Bh2 Rg1 (43...Qh2 44.Qh2 Rh2) 44.Kg1 Rd1 (44...Qg4 45.Qg3 Qd1 46.Qe1 Qe1) 45.Kf2 Qf1 46.Ke3 (46.Ke3 Rd3 47.Ke4 Qf3 48.Ke5 Qf6 49.Ke4 Qd4 50.Kf5 g6 51.Kg5 f6) 1–0. BeepBeepImAJeep (2745) – titan00013 (2670), lichess.org, 2020.

6.d4 Be7 7.c4 0–0 8.Nf3 c6 9.bc6 bc6 10.cd5 (10.Nc3 Qa5=) 10...cd5 11.Nbd2 (11.Bd3 Qb6 12.Bc1 Ba6+=) 11...Ba6 (11...Qa5 12.Rc1=) 12.Ba6 (12.Qa4 Qd6 13.Bc3 Nbd7+=) 12...Na6 (12...Ra6 13.Ne5+=) 13.0–0 (13.Qa4 Qb6 14.Rb1 Nc7=) 13...Nc7 14.Rb1 (14.Ne5=) 14...Rb8 (better is 14...Nb5!?+=) 15.Qa4+= Nb5 Attacks the isolani on a3 16.Rfc1 Qd7 (16...Qd6 17.Ra1+=) 17.Ba1 (17.Ne5 Qe8 18.Nc6+/–) 17...Ne4? (better is 17...Ba3 18.Ne5 Qa7 19.Qa7 Na7=) 18.Ne4 de4 19.Nd2 (19.Ne5!? Qa7 20.Qa7 Na7 21.Rb8 Rb8 22.Nc4+/–) 19...f5 20.Nc4 Ba3?? (20...Qd5 21.Bb2+=) 21.Ne5 Qa7= 22.Qa7 Na7 23.Rb8 Rb8 24.Rd1 Nb5 25.Nc6 Rc8 26.Bb2?? Rc6–+ 27.Ba3 Na3 28.g3 Kf7 29.Kg2 Nb5 30.Rb1 Nc3 31.Rb7 Kf6 32.Ra7 Nd5 33.Rb7 Rc2 34.Ra7 Ne3 (34...Ne3 35.Kh3 Rf2 36.Ra8 Nf1 37.Rf8 Kg6 38.Rf5 ef5 39.d5 Rh2) 0–1. Fournier,Frederic – Strubbel (1760), Partie evaluee, 5m + 0s, 2008.

6.Nf3 c5 7.c4 Bd7 8.Nc3 dc4 (8...Qa5 9.d4+=) 9.Bc4 b6 (9...Qa5 10.e4+=) 10.Na4+/– Be7 11.Nc3 0–0 12.0–0 Ra5 13.a4 Qc7 14.Qb3 (14.Qc2 Bd6+/–) 14...Be8 (14...Bc8 15.d4+/–) 15.Rfd1 Nbd7 16.Rac1 Ne5? (better is 16...Bd6!?+/–) 17.Ne5+– Qe5 18.Ne2 (better is 18.Nd5! Qd6 19.Nf6 Bf6 20.Bf6 gf6+–) 18...Qg5 19.Ng3 Bd6 (19...Bd7 20.d4 Rd8 21.dc5 Bc5 22.Bc3+–) 20.d4 Bg3 21.hg3 cd4 22.Bd4 Ng4? (better is 22...Nd7!?+–) 23.Qc2 (better is 23.Bb6!? Ra8 24.Be2 Qf5+–) 23...Qh5 24.Kf1 (24.e4 Ra8+–) 24...Ra8 25.Be2?? Qh1 0–1. Fournier,Frederic (1660) – jbga (2060), Active (3/0), 2004.

6.Nf3 c5 7.c4 Nbd7 8.d3 Nb6 9.Nbd2 Bd6 10.e4 de4 11.Ne4 Be7 12.Qc2 Nbd7 13.Be2 b6 (13...Qa5 14.Bc3 Qc7 15.0–0=) 14.0–0 Bb7 15.Nc3 Qc7 16.d4 (16.Na4 Bd6+=) 16...Ng4 (16...cd4 17.Nd4 Bd6 18.h3=+) 17.g3 (17.d5 Bd6 18.h3 Nh2+/–) 17...h5 (17...cd4!? 18.Nd4 Ngf6+=) 18.d5+/– Ndf6 ( 18...0–0!?+/–) 19.de6+– h4 20.ef7 Kf8 21.Nd5 (21.Rfe1 hg3 22.hg3 Nf2 23.Kg2–+) 21...Nd5 ( 21...Bd5!? 22.cd5 hg3 23.hg3 Ne3+/–) 22.cd5+– Bd5 (22...hg3 23.fg3 Rh2 24.Be5+/–) 23.Qf5 Nf6 (23...hg3 24.hg3 Nf6 25.Bf6 Bf6 26.Qd5 Rd8+–) 24.Ng5?? ( 24.Bf6!? Bf6 25.Qd5+–) 24...Rd8 (24...Qc8 25.Qc2+/–) 25.Bf6 gf6 26.Nh7 Kg7 27.f8Q Bf8 28.Qg4 (28.Nf6!? Qf7 29.Qg5 Qg6 30.Nh5 Rh5 31.Qh5 Qh5 32.Bh5 Kh6+–) 28...Kf7+/– 29.Bd3 (< 29.Nf8 Kf8 (< 29...Rhf8 30.Bd3+/–) 30.Rad1 Qh7+=) 29...Rg8 30.Qh5 (30.Qa4?? hg3 31.Be4 gf2 32.Kh1 Be4 33.Qe4 Rd4 34.Nf6 A) 34...Kf6 35.Rf2 Kg7 36.Rg1 Kh8 37.Rg8 Kg8 38.Qe6 Kh7 A1) 39.Rf8 Rd1 40.Kg2 Qg7 41.Kh3 Rd3 (41...Qf8?! 42.Qe4 Kg8 43.Qg4 Qg7 44.Qd1=) 42.Kh4 Rd4 43.Kh5 Qf8 44.Qg6 Kh8 45.Qh6 Qh6 46.Kh6 c4–+; A2) 39.Rf7 Qf7 40.Qf7 Bg7 41.Qf5 Kh6 42.Qe6 Kh7 43.Qb6+–; B) 34...Re4 35.Ne4 Rg1 36.Rg1 fg1R 37.Kg1 Qd7 38.Rf1 Kg7–+; 30.Qh4?! Qe5+–) 30...Kg7 31.Ng5! (31.Nf8?! Kf8 32.Qh4 Qe5+–) 31...Bd6 (31...fg5 32.Qh7) 32.Qg6 Kf8 33.Qf6 Ke8 34.Rae1 (34.Bg6 Rg6 35.Qg6 Kd7 36.Qf5 Ke8 37.Qd5 Qe7+–) 34…Be7 (35.Bg6 Rg6 36.Qg6 Kd7 37.Re7 Ke7 38.Re1 Kf8 39.Nh7 Qh7 40.Qh7 Re8 41.Qh6 Kf7 42.Qh5 Kf6 43.Re8 Bf7+–) +–. Radnai – Olej,Emil, corr ICCF EU–I–GT–19, 1966–68.

6.Nf3 c5 7.bc6 bc6 8.c4 Be7 9.Be2 0–0 10.Qc2 Nbd7 11.Nc3 Exerts pressure on the isolated pawn 11...Qa5 12.0–0 Nc5 13.Nd4 (13.Ne5 Bd6 14.f4 Bd7+=) 13...Bd7 14.f4 Rfb8 15.Nf3 (15.Rab1 Qd8=) 15...h6 (15...Rb3 16.Rab1=) 16.Ne5 (16.Rab1 Nce4=) 16...Be8 (16...d4 17.ed4 Nb3 18.Ra2 Nd4 19.Qd3+=) 17.Rab1 Rb7 (17...Nce4 18.Rfc1+=) 18.g4 (18.d4 Nce4 19.Ne4 Ne4=) 18...Rab8 19.d3 Bd6 (19...d4 20.ed4 Nb3 21.Ne4+=) 20.h4 (20.Bf3 Nb3=) 20...Be5+= 21.fe5 Nh7 (better is 21...dc4!? 22.d4 Nd3+=) 22.d4+= Nb3 23.Bd3 Nf8 24.Qf2 Ra8 25.c5+/– Qd8 26.Na2 Rab8 27.Nb4 Qe7 28.Bc3 Ng6 29.h5 Nf8 30.Rb2 Nh7 31.Bh7 Kh7= 32.Qh2 Kg8 33.Be1 Qf8 34.Rg2+= Ra8 35.g5+/– Kh7 36.gh6+– f5 37.ef6 gh6? 38.Bg3 Raa7 39.Bd6 Qf7 40.Rg7 Qg7 41.fg7 Rg7 42.Kf2 Rg5 43.Ke1 Rag7 44.Qc2 Bg6 45.hg6 R7g6 46.Be5 Kg8 1–0. Schwarz,B – Leonhardt,G, OWL–ch Buende, 1949.

6.Nf3 Bd6 7.Nc3 Nbd7 8.Bd3 (8.Be2 e5=+) 8...0–0 9.Rg1 (9.0–0 e5 10.Be2 Nb6=+) 9...Nc5 (9...e5 10.Bf5–/+) 10.Be2=+ e5 (10...Re8 11.d4 Nce4 12.Ne4 Ne4 13.c4=+) 11.g4 (11.d4!? ed4 12.Qd4=+) 11...e4–/+ 12.g5 (12.Nh4 Bh2 13.Rg2 Be5–/+) 12...Nfd7 (12...ef3!? 13.gf6 fe2 14.Rg7 Kh8 15.Qe2 Qf6–+ (15...Bh2?? 16.Rh7 Kh7 17.Qh5 Kg8 18.Qg5 Kh7 19.Qg7)) 13.Nd4–/+ Nb6 14.h4 (14.f4 ef3 15.Nf3 Be6–/+) 14...Re8 (14...Bh2 15.Rf1–/+) 15.h5 Be5 16.g6 fg6 17.hg6 h6 18.Bg4 Rf8 19.Bc8 Rc8 20.Qh5 (20.Qg4 Qf6 21.0–0–0 c6–/+ (21...Qf2 22.Ne6+–)) 20...Qf6 (20...Bd4 21.ed4 Ne6 22.0–0–0–+) 21.0–0–0 (21.Rf1 c6 (21...Bd4?! 22.Nd5 Qd6 23.ed4 Nd3 24.cd3 Nd5 25.de4=+) 22.bc6 bc6–/+) 21...c6–+ (21...Bd4 22.ed4 Qd4 23.Rde1–+) 22.Nce2 Nc4 23.Rdf1 Qd6 (23...Ne6!? 24.Bc3–+) 24.f4–/+ ef3! 25.Rf3 (25.Nf3 Bb2 Double attack (25...Bb2 Pinning; 25...Bb2 Deflection); 25.Rf3 Rf3 Combination) 25...cb5 26.Rf8 Rf8 27.Nf5?? (better 27.Bc3 Na3 28.Nf5–/+) 27...Bb2–+ 28.Kd1 Qf6 (28...Qd7 29.Neg3–+) 29.Ned4 (29.Rf1 Qe5 30.Ned4 Ba3 31.Nh6 gh6 32.Rf8 Kf8 33.Qf3 Ke7–+) 29...Bd4 30.Nh6 (30.Nd4 Rd8 31.Qf5 Qf5 32.Nf5 Ne4–+) 30...gh6 31.Qh6 (31.Qd5 Kg7 32.Qd4 Qd4 33.ed4 Ne4–+) 31...Qg7 (31...Qf3 32.Kc1 Qf1 33.Rf1 Rf1) 32.Qh5 (32.Qh7 Qh7 33.gh7 Kh7 34.Rh1 Kg8 35.ed4–+) 32...Bf6 (32...Be5 33.Kc1 Ne4 34.d4–+) 33.Rf1 (better 33.Qd5 Rf7 34.gf7 Kf8 35.Qc5 Be7 36.Qc8 (36.Rg7 Bc5 37.Rg5 b6–/+) 36...Kf7 37.Rg7 Kg7 38.Qb7+–) 33...Nb6 (33...Qd7 34.Rh1–+) 34.Rf5 (34.Rh1 Bb2 35.Qg4 Ba3–+) 34...Re8 (34...Be7 35.d3–+) 35.Rf4 (35.Rf1 Ne4 36.d3 Nc3 37.Kd2 d4–+) 35...Ne4 (better 35...Qh8 36.Qh8 Bh8 37.Rb4–+) 36.Rg4 (36.Ke1 Qh8 37.Qh7 Qh7 38.gh7 Kh7–+) 36...Nd6 (better 36...Nf2 37.Ke2 Ng4 38.Qg4–+) 37.Rf4 (37.c3 Qh8 38.Qh8 Bh8–+) 37...d4 (better 37...Bb2 38.Rh4–+) 38.Ke2 (38.ed4 Qh8 39.Qh8 Bh8–+) 38...de3 39.Qh7 (39.de3 Ne4 40.Rf3 Qc7 41.Qh7 Qh7 42.gh7 Kh7–+) 39...Qh7 40.gh7 Kg7 (better 40...Kh7 41.de3 Nd5 42.Rf3–+) 41.d3 Nd5 42.Rg4 Kh8 (better 42...Kh7 43.d4 Nc4–+) 43.Rf4 Nc3 (43...Nf4 44.Kf3 e2 45.c3 e1Q 46.Kf4 Re3 47.d4 Qg3) 44.Kf3 Bg7 (44...e2 45.Rg4 Re3 46.Kf2 e1Q 47.Kg2 Re2 48.Kh3 Qf1 49.Kg3 Nf5) 45.Rf6 Rf8 (45...Bf6 46.Kg3 e2 47.Kh2 e1Q 48.Kg2 Qe2 49.Kg1 Qd2 50.d4 Re1) 46.Rf8 Bf8 47.Ke3 Kh7 48.Kd2 Kg8 (better 48...b4 49.ab4 Ndb5 50.Ke3–+) 49.d4 (49.Kc3 Nf5 50.Kb2 Bg7 51.c3 Ne3–+) 49...Kf7 (better 49...Nde4 50.Ke3 b4 51.ab4 a3 52.d5 a2 53.Kd3 a1Q 54.Kd4 Qd1 55.Ke5 Bd6 56.Kf5 Qh5 57.Ke6 Qf7) 50.Kc3 Ke8 0–1. TwelveTeen (2640) – penguingim1 (2750), lichess.org, 2017.

6.Nf3 Bd6 7.Be5 =+.

6.Nf3 Bd7 7.c4 dc4 8.Bc4 c6 9.bc6 Bc6 10.Nc3 Nbd7 11.0–0 Be7 12.d4 0–0 13.Qe2 Ne4 14.Ne4 Be4 15.Nd2 Bc6 16.Rfe1 Bd6 17.e4 Qg5 18.Nf3 Qg6?? (better is 18...Qh5+=) 19.d5+– ed5 20.ed5 (20.Bd5?! Rfe8 21.Qd2 Nc5=) 20...Rae8 (20...Rfd8 21.dc6 bc6 22.Nh4+–) 21.Qd2 (21.Qe8 Re8 22.Re8 Bf8 23.dc6 Qc6+–) 21...Ne5 (21...Bd5 22.Bd5 Nb6 23.Bb7 Nc4+–) 22.Ne5 (22.Be5 Be5 23.Ne5 Qd6 24.Nf7 Qc5 25.dc6 Re1 26.Re1 Qc4+–) 22...Be5 23.Be5 (23.dc6?! Bb2 24.Qb2 bc6+–) 23...Bd7 24.Bc3 (24.Qb2 b6+–) 24...Bh3 25.Bf1 Re4 (25...Bf5+–) 26.Re4 Qe4 27.f3 (better is 27.gh3 Qg6 28.Kh1 Rc8+–) 27...Qg6 28.Re1 h6 29.d6 (29.d6 Be6 30.Bb5+–) 1–0. Fournier,Frederic (2090) – NN, jeu.europe–echecs.com, 2013.

6.Nf3 Bd7 7.c4 c6 8.Nc3 Qa5 (8...dc4 9.Bc4 Bd6 A) 10.Na4? cb5 11.Bf6 gf6–+ (11...Qf6?! 12.Nb6=+); B) 10.0–0=) 9.Ne5 Bd6 10.f4 0–0 11.Be2 Qa7 12.Rb1 d4 13.ed4 Qd4 14.Nd5 Qe4 (14...cd5 15.Bd4) 15.0–0?? ( 15.Nf6 gf6 16.Ng4+/–) 15...Be5?? ( 15...cd5 16.Rc1 Bc5 17.Kh1 Qf5–+) 16.d3 (16...Qd4 17.Bd4 Bd4 18.Kh1 ed5 19.bc6 Bc6 20.Bf3–/+; 16.Ne7 Kh8 17.fe5+/–) 1–0. Brauer,Christian – Hauswald, corr, 1974.

6.Nf3 Nbd7 7.c4 b6 (7...dc4 8.Bc4 Bd6 9.d4=) 8.Nc3+= Nc5 9.cd5 Nd5 10.Nd5 Qd5 11.Rc1 Bd6 12.Bc4 (12.Qc2 0–0+=) 12...Qe4 (12...Nd3 13.Bd3 Qd3 14.Qc2 Qc2 15.Rc2–/+) 13.d3 (13.d4 Nb3 14.Bb3 ab3 15.Qb3 Bb7=) 13...Qg4+= 14.h3 (14.0–0 Bb7+=) 14...Qg2= 15.Rg1 Qh3 16.Bg7 (16.Rg7!? h5 17.Ng5 Qh1 18.Ke2 Qd1 19.Rd1+/–) 16...Rg8+= 17.Ng5 Qh2 18.Nf3 Qh3 (18...Qh5 19.Rg5 Qh3 20.Qe2+=) 19.Ng5= Qh2 (19...Qf5 20.e4 Qf4 21.Nh3+=) 20.Nf3 Qh3 ½–½. Fournier,Frederic (2255) – Leyoro (1820), Active, 2007.

6.Nf3 Be7 7.c4 0–0 8.Qc2 Nbd7 9.Bd4 b6 10.Nc3 Bb7 11.Na4 (11.cd5 Nd5 12.Na4 Bd6+=) 11...Bd6 (11...c5 12.Bb2=) 12.Be2 (12.c5 bc5 13.Nc5 Nc5 14.Bc5 c6+=) 12...e5 (12...dc4 13.Qc4 e5 14.Bb2=) 13.Bb2 (13.c5 ed4 14.cd6 de3 15.de3 cd6+=) 13...Re8 (13...dc4 14.Bc4 e4 15.Nd4=) 14.h3 (14.cd5 Nd5 15.0–0 Ra5+=) 14...Nc5 (14...e4!? 15.Nd4 dc4=) 15.Nc5+= bc5 16.d4 (better 16.cd5!? e4 17.Nh4+–) 16...ed4= 17.ed4 dc4 18.0–0 cd4 (18...Qe7 19.Bd1=) 19.Nd4+= Be5 (19...Ba3 20.Ba3 Qd4 21.Bc4+=) 20.Nc6 (better 20.Rad1!? c3 21.Qc3+=) 20...Bc6= 21.bc6 c3 (21...Bb2 22.Qb2 c3 23.Qa2=) 22.Bc1 Qd6 23.Bf3 Qc5 (23...Qe6 24.Rd1+=) 24.a4 (24.Rd1 Bd6+=) 24...Nd5= 25.Qb3 Nf6 26.Be3 Qa5 27.Qc2 Nd5 28.Bd5 (28.Be4 h6=) 28...Qd5=+ 29.Ra2 (29.Rfd1 Qc6 30.Bd4 Ra5=+) 29...Qc6 30.Rb1 Ra5 31.Qb3 (31.Rd1 Qf6–/+) 31...h6 (31...Qe4 32.Qb4 Qb4 33.Rb4–/+) 32.Rc1 (32.Qc2!?–/+) 32...Rea8 33.Rca1 Qd6 (33...Qe4 34.Kf1–+) 34.Rd1–/+ Qc6 (34...Qe6 35.Qc2–/+) 35.Rda1–+ Qe8 (35...Qe4 36.Kf1–+) 36.Qc2–/+ c5 37.g3 (37.Ra3 Rb8–/+) 37...Rb8 38.Rd1 (38.Re1 Rb2 39.Rb2 cb2–/+) 38...Rb4 (38...Rb2 39.Rb2 cb2 40.g4–+) 39.Rd5 (better 39.Re1 Bd4 40.Bd2–+) 39...Rba4?? (39...Bf6 40.Qf5–+) 40.Ra4?? (better 40.Re5 Qe5 41.Ra4 Ra4 42.Qa4+–) 40...Ra4–+ 41.Qd1 (41.Rc5 Ra1 42.Kh2 Qa8–+) 41...Bd4 42.Rd8?? (42.Rd6–+) 42...Qd8 43.Qa4 Be3 44.fe3 Qd3 45.Qa3 (45.Qe8 Kh7 46.Qe5 c4–+) 45...Qe3 (45...Qb1 46.Kf2 Qb2 47.Qb2 cb2 48.Kf3–+) 46.Kf1 Qd3 (better 46...Qf3!? 47.Ke1 Qg3 48.Ke2 Qg2 49.Ke1 Qd2 50.Kf1–+) 47.Kf2 Qd2 48.Kf3 c2 49.Qa8 Kh7 50.Qe4 g6 51.Qc4 Kg7 (51...Kg7 52.Qc5 c1Q 53.Qc1 Qc1–+) 0–1. petrobbo (2010) – alun (2080), ChessWorld.net, 2018.

6.Nf3 Be7 7.c4 c6 8.Nc3 cb5 (8...Qa5 9.cd5 ed5 10.Bd3=) 9.cd5+– Nd5 10.Bb5 Will a4 fall? (10.Nd5 ed5 11.Bg7 Rg8+–) 10...Bd7+= 11.Bd7 Qd7 12.0–0 (12.Ne5 Qd6 13.Ne4 Qd8+=) 12...0–0 13.Nd5 Qd5 14.Bc3 Nc6 15.Qb1 Bf6 (better 15...b5!?=) 16.Bf6+– gf6 17.Qb7 Rab8 (17...Rfb8 18.Qc7+–) 18.Qc7 (18.Qa6+–) 18...Rbc8 (18...Ne5!? 19.Ne5 fe5+–) 19.Qf4 (19.Qg3 Kh8 20.Qh4 Qf5 21.Qa4 Ne5 22.Ne5 fe5+–) 19...Kh8 (better 19...Ne5 20.Ne5 fe5 21.Qa4 Rc4+–) 20.Qf6 (20.Qf6 Kg8 21.Qh4+–) 1–0. Abdullaevich (1900) – Argie (1885), lichess.org, 2020.

6.f4 c5 7.Nf3 c4 8.Nc3 Nbd7 9.Be2 Bc5 10.0–0 Qc7 11.Qe1 ( 11.Kh1!?=) 11...Qf4–/+ 12.Nd4 Qc7 13.Qh4 Ne5 (13...0–0 14.Qg5 Qd6 15.Rf3–/+) 14.Rf6 (14.Qg3 Rf8 15.Qg7+/–) 14...gf6–/+ 15.Qf6 Rg8 16.b6 Qb6 17.Qe5 Qb2 18.Rf1 Bd4 19.ed4 Ra5? (19...Qc2 20.Bh5 Rg6 21.Nd5 Qd2 22.Nc7 Kd8 23.Bg6 Qh6+–) 20.Bh5 (20.Qc7 Bd7 21.Qb8 Ke7 22.Qg8 f6 23.Qg7 Kd8 24.Qf6 Kc7 25.Qe5 Kc6+–) 20...Rf8 21.Qc7 1–0. Grund,Karl – Olej,Emil, corr ICCF EU–H–GT–12, 1966.

6.g4 c5 7.g5 (7.bc6 Nc6 8.Bb5 Bd7=+) 7...Ne4 8.h4 b6 (8...c4 9.Nc3 Nd6 10.d3=) 9.Nh3 (9.Nf3 Ra5=) 9...Bb7 (9...Ra5 10.d3 Nd6 11.c4=+) 10.Rg1= c4 (10...Nd7 11.d3 Nd6 12.c4=) 11.Nf4 (11.d3 cd3 12.Bd3 Qc7=) 11...Nd7 (11...Ra5 12.d3 Rb5 13.de4 Rb2 14.Nc3+=) 12.Nc3 (12.d3 cd3 13.cd3 Nec5=) 12...Nc3=+ 13.Bc3 Qc7 (13...e5 14.Nh5=) 14.Nh5 (14.Qh5 g6 15.Qg4 e5=) 14...Rg8=+ 15.Bh3 (better 15.Ng3=+) 15...Bd6?? (better 15...Qh2 16.Rg3 Bd6–/+) 16.Ng7+– Rg7? (better 16...Kd8 17.Be6! d4 18.Bd4 Be5+=) 17.Bg7+– Be5 (17...Nc5 18.f4 Bf8 19.Bd4+–) 18.Be5 Ne5 19.f4 Nd7 20.Qh5 (better 20.d4+–) 20...0–0–0 (20...Nf8+–) 21.Qf7 (worse 21.Qh7 Nf8 22.Qg7 d4+–) 21...c3 (21...e5 22.Bd7 Qd7 23.Qd7 Kd7 24.fe5+–) 22.d3 (22.Be6!? Kb8 23.Qh7 d4+–) 22...d4 23.ed4 (23.Qh7 de3 24.Rf1 Kb8+–; 23.Qe6 Kb8+–; 23.Be6 de3 24.Bd7 Rd7 25.Qe8 Rd8 26.Qe3 Qf7+–) 23...e5?? (23...Rf8 24.Qf8 Nf8–/+) 24.fe5+– Rf8 (24...Kb8 25.Qh7 Bc8+–) 25.Qf8 (25.Qf8 Qd8 26.Bd7 Kd7 27.e6 Kc7 28.e7 Qd4 29.0–0–0+–) 1–0. FeegLood (2640) – Kingscrusher_YouTube (2365), lichess.org, 2015.

6.g4 c5 7.g5 (7.bc6 bc6 8.f4 Ba6=+) 7...Ne4 8.h4 h5 (8...c4 9.Nc3 Nd6 10.d3=) 9.Nh3 (9.Be2 Bd7=) 9...b6 (9...Bd7 10.Nf4=) 10.Nf4 Bb7 11.Nh5 (11.Bg2 Ra5 12.Qe2 Nd7+=) 11...d4= 12.Bg2 (12.Rh3=) 12...Nd6 (better 12...Ra5!? 13.d3 Rb5 14.Bd4 cd4 15.Be4 Be4 16.de4 de3 17.Qd8 Kd8–/+) 13.Bb7+– Nb7 14.Qf3 Qd5? (better 14...Qd7+–) 15.Qd5+– ed5 16.Nf4 de3 (16...Nd6 17.Nd5 Ra7 18.ed4 Nb5 19.dc5 bc5 20.Nbc3 Nc3 21.Bc3+–) 17.fe3 d4 18.ed4 (18.Nd5 Ra7 19.ed4 Nd7+–) 18...cd4 (18...Nd7 19.h5+–) 19.Nd5 Kd8 (19...Ra5 20.Bd4 Nd7 21.Nbc3+–) 20.Bd4 (20.Nb6?! Ra5 21.Bd4 Rb5 22.Na4 Rg5+–) 20...Nc5 (20...Nd7 21.Bb6 Nb6 22.Nb6+–) 21.Nb6 Ra7 (21...Ra5 22.Nc3+–) 22.Nc3 Re7 23.Kd1 (23.Be3 Ne4 24.0–0–0 Re6+–) 23...Nbd7 (23...Ne4 24.Nca4 Ng5 25.Be3+–) 24.Nd7 (24.Nbd5 Re6+–) 24...Rd7 25.Na4 (better 25.Be3+–) 25...Rd4+= 26.Nc5 Bc5 27.a4 Rhh4 28.Rh4 Rh4 29.Ke2 Re4 (29...Rg4 30.Kf3 Rg5 31.d4+=) 30.Kd3 (30.Kf3 Rd4 31.d3+=) 30...Re6 (better 30...Rd4!? 31.Kc3 Rg4=) 31.a5+– Be7? (better 31...Rg6+–) 32.a6+– Bc5 33.a7 Ba7 (33...Rd6 34.Ke2 Ba7 35.Ra7+–) 34.Ra7 Rb6 (34...Ke8 35.Kc4+–) 35.Rf7 g6 (35...Rb5 36.Rg7 Rd5 37.Ke3+–) 36.Rf6 (better 36.c4 Re6 37.Rf6 Re1+–) 36...Rb5 37.Rg6 Ke7 (37...Rd5 38.Ke3 Re5 39.Kd4+–) 38.Ke4 (38.c4 Rf5+–) 38...Rb4 (38...Rc5 39.c3+–) 39.d4 Rb2 (39...Ra4 40.Rb6+–) 40.Kd3 (40.c4 Rg2+–) 40...Rb1 41.Rf6 (41.c4 Rg1+–) 41...Rd1 (41...Rb5 42.c4 Rg5 43.Rh6+–) 42.Kc4 (42.Ke3 Re1 43.Kd2 Re4+–) 42...Rg1 (42...Rc1 43.c3+–) 43.Rf5 Rg4 (43...Kd6 44.d5+–) 44.Re5 (44.Kd5!? Rg2 45.c4 Ra2+–) 44...Kd6 45.c3 White prepares d5 (45.Kd3 Rg3 46.Ke4 Rg4 47.Ke3 Rg3 48.Kf4 Rc3+–) 45...Rg1 46.Rd5 Kc6 47.Re5 Kb6?? (47...Kd6 48.Kb4 Rb1 49.Ka4 Rg1+–) 48.d5 (better 48.Kd5 Kc7+–) 48...Rg4 49.Kd3 Kc5 50.Rf5 Rg3 (50...Rh4 51.Ke3 Rc4 52.Kf3 Rc3 53.Kf4+–) 51.Ke4 Rc3 (51...Kd6 52.Rf6 Ke7 53.Re6 Kd7 54.g6+–) 52.g6 (52.Ke5 Rg3+–) 52...Rg3 53.Rf6 Rg4 (53...Rg5 54.Re6 Kb5+–) 54.Kf5 Rg1 55.d6 Kc6 56.Ke6 Re1 57.Kf7 (57.Kf7 Kd7 58.g7+–) 1–0. FeegLood (2570) – Kingscrusher_YouTube (2415), lichess.org, 2015.

6.g4 Nbd7=+ 7.g5 Ne4 8.h4 (8.f3 Nd6 (worse 8...Ng5 9.h4+–) 9.f4 c6=+) 8...h5 (8...h6 9.gh6 Rh6 10.Nf3=+) 9.Nh3 (9.Nf3 c5=) 9...e5 10.Be2 g6 (10...c5 11.Bf3=) 11.Bf3 Bg7 12.d3 Nf2?? (better 12...Nd6=) 13.Nf2+– c6 14.Nd2 (14.c4 Nb6+–) 14...Qc7 (14...Qb6 15.Qe2 Qb5 16.Rb1+–) 15.Bg2 (15.c4 Qb6 16.Qe2 0–0+–) 15...0–0 (15...Qb6 16.0–0+–) 16.0–0 (16.bc6 bc6 17.Rb1 f5+–) 16...f6 (16...Qb6+–) 17.c4 fg5 (17...Qd6 18.cd5 cd5 19.Qf3+–) 18.cd5 gh4 (18...cb5 19.hg5 Nb6 20.e4+–) 19.dc6 bc6 20.Bc6 Nf6 (20...Ra7+–) 21.Ba8 Bb7 (21...Qa7 22.Bc6 Qe3 23.Nf3+–) 22.Bb7 Qb7 23.Nfe4 (23.Qa4 Nd5 24.Nc4 Rb8+–) 23...Ng4 (23...Qb5 24.Nf6 Rf6 25.Rf6 Bf6 26.Qc2+–) 24.Rf8 (24.Qa4 Ne3 25.Qb3 Kh7 26.Rf8 Bf8+–) 24...Kf8 25.Qf3 Kg8 (25...Ke7 26.Rf1 Qd5 27.b6+–) 26.Rf1 (better 26.Nf6! Bf6 27.Qb7 Bg7+–) 26...Qe7 (26...Qd5 27.b6 Qd8 28.Qf7 Kh7 29.Qa7 Qd3 30.b7 Qe3 31.Qe3+–) 27.Bc3 (27.b6 Kh8+–) 27...Qc7 (27...h3 28.b6 Qd8 29.Qf7 Kh7 30.b7 h2 31.Kh1+–) 28.Bb4 Kh7 (28...Qd8 29.Qf7 Kh8 30.Qg6 Qd3 31.Qe8 Kh7 32.Ng5 Kh6 33.Nde4 Qe3 34.Kh1 Nf2 35.Rf2 Qf2 36.Qe6 Bf6 37.Bf8 Kg6 38.Qf7 Kf5 39.Qf6 Kg4 40.Nf2 Kg3 41.Nge4) 29.Ng5 Kh6 30.Nf7 Kh7 31.Ne4 Qd7 32.Neg5 Kg8 33.Nd6 (33.Qa8 Qd8 34.Qd8 Bf8 35.Qf8) 33...Nf6 34.Qa8 (34.Qa8 Qe8 35.Ne8 Bh6 36.Nf6 Kg7 37.Qf8) 1–0. FeegLood (2540) – taleguito (1840), lichess.org, 2015.

6.g4 Nbd7=+ 7.g5 Ne4 8.h4 (8.f3 Nd6 (worse 8...Ng5 9.h4+–) 9.f4 Nb6=+) 8...h6 9.g6 fg6 (9...f6 10.Nf3=+) 10.Qg4= Kf7 11.Nf3 h5 (11...Be7 12.Rg1 g5 13.hg5 Ng5 14.Kd1=) 12.Qg2 Be7 (12...Bd6 13.d3 Nef6 14.Rg1=) 13.Rg1 (13.Nc3 Bf6 14.Rg1 Rh6=) 13...Rh6= 14.Bd3 (14.Nc3 Bh4 15.Ne4 de4 16.Nh4 Qh4+=) 14...Bf6 (14...Bh4 15.Be4 de4 16.Nh4 Qh4 17.Nc3=+) 15.Nc3 Nc3 (15...Ndc5 16.Be4 Ne4 17.Ng5 Ng5 18.hg5 Bc3 19.Bc3=) 16.Bg6 Kg8 (16...Kf8 17.Bc3 Bc3 18.dc3=) 17.Bc3 Bc3 18.dc3 Qf6 19.Kd2 (19.0–0–0!?=) 19...e5–/+ 20.e4 (20.Be8 Nb6 21.Ng5 Nc4 22.Kc1 Nd6 23.Qd5 Kf8–/+) 20...Nb6 (better 20...Nc5 21.Ke1 Bg4–/+ (worse 21...Ne4 22.Be4 de4 23.Ng5=+)) 21.Qg5?? (21.ed5 c6 22.Qg5 Qf3 23.Qd8 Qf8 24.Qb6–/+) 21...Bg4 (21...Qf3 22.Qd8 Qf8 23.Qf8 Kf8 24.ed5–+) 22.Ne5?? (22.Qf6 gf6 23.Bh5 de4 24.Rg4 Kh7+=) 22...Qg5 (better 22...Qf2 23.Kc1 Qg1 24.Kb2 Qc5 25.Bf7 Kf8–+) 23.hg5+– Nc4 24.Nc4 Rg6 25.ed5 (25.Ne5 Rg5 26.Ng4 hg4+=) 25...Rg5 (25...Rf8!? 26.Raf1 Bh3+=) 26.Ne3+– Re8 (26...Rf8 27.Raf1 (27.Ng4?! Rd5 28.Ke2 hg4=) 27...Rf3 28.c4+– (28.Ng4?! Rd5 29.Kc1 hg4=)) 27.f3 (27.f3 Rge5 28.fg4 Re3 29.gh5 Re2 30.Kc1+=) 1–0. FeegLood (2560) – potpiedude (2305), lichess.org, 2015.

6.g4 Be7 (6...Nbd7 7.Be2=+) 7.g5= Nfd7 (7...Ne4 8.Bg7 Rg8 9.Bd4 Bg5 10.Nf3=+) 8.h4 (8.Bg7 Rg8 9.Bh6 Bg5 10.Bg5 Qg5=) 8...f6 (8...e5 9.Nc3 Nb6 10.Qf3=+) 9.Qh5 g6 10.Qd1 0–0 (10...e5 11.h5 Rf8 12.hg6 hg6 13.gf6=) 11.Nf3 (11.h5 e5+=) 11...c5 (11...fg5 12.hg5 Bg5 13.Ng5 Qg5 14.Qe2=) 12.bc6 (12.h5 gh5 13.Rg1 f5+–) 12...Nc6 13.c4 (13.h5!?+=) 13...fg5 14.hg5 Bg5 (14...Nb6 15.cd5 ed5 16.Rg1=+) 15.Ng5= Qg5 16.cd5 (16.d4 dc4 17.Bc4 Nb6=+) 16...ed5 (16...Nde5 17.Qc2 ed5 18.Nc3–/+) 17.Nc3 (17.Qc2 Nde5 18.Be5 Ne5–/+) 17...Nf6 (17...Nde5 18.Qc2–/+ (18.Na4 Nf3 19.Qf3 Rf3–+)) 18.Qc2 (18.Rc1 Ng4 19.f4 Rf4 20.ef4 Qf4–+) 18...Qf5 (18...Ne5 19.0–0–0 (19.Na4? Nf3 20.Kd1 Qg4–+) 19...Bf5 20.d3–/+) 19.Bd3=+ Ne4 The backward pawn on f2 becomes a target (19...Qf3 20.Rf1 Nd4–+) 20.Ne4 (20.f4 Ne5 21.Be4 de4 22.Ne4 Nf3 23.Kd1 Qg4+–) 20...de4 21.Bc4 Be6 22.f4 (22.Qc3 Kf7 (22...Qf2? 23.Kd1 Kf7 24.Rf1 Qf1 25.Bf1+–) 23.Rh7 Ke8 24.Be6 Qe6 25.Rb7 Rc8=) 22...ef3= 23.Qf5 Rf5?? (better 23...Bc4 24.Qc5 f2 25.Kd1 f1Q 26.Rf1 Rf1 27.Kc2 Bb3 28.Kd3 Rf2=+) 24.Be6+– Kf8 (24...Rf7 25.Bf7 Kf7 26.Rh7 Ke6 27.Kf2+–) 25.Bf5 gf5 26.Rh7 Rd8 (26...Re8 27.Rb7 f4 28.Kf2 fe3 29.de3+–) 27.Rh8 (27.Bc3 Ke8+–) 27...Ke7 28.Rd8 Kd8 (28...Nd8 29.Kf2+–) 29.Kf2 Kc7 (29...Na5 30.d3 b5 31.Kf3+–) 30.Kf3 Ne5 (30...Kd7 31.Rb1+–) 31.Ke2 (better 31.Be5!? Kd7+–) 31...Nd3 (31...Nc6 32.Rf1+–) 32.Rc1! Nc5 (32...Nc1 33.Bc1 Combination) 33.Rc5 Kb6 34.Rf5 (better 34.d4 Ka6 35.d5 b6+–) 34...Ka6 35.Kd3 b6 36.Kc4 b5 37.Rb5 Ka7 38.e4 (38.Bd4 Ka8 39.Kc5 Ka7 40.Kc6 Ka8 41.Rf5 Kb8 42.Rf8) 38...Ka6 39.e5 Ka7 40.e6 Ka6 41.e7 Ka7 42.e8Q Ka6 43.Qa8 1–0. FeegLood (2655) – Dingo123 (2135), lichess.org, 2015.

6.g4 h6 7.h4 (7.c4 Be7=+) 7...Be7 (7...Nbd7 8.Nh3=+) 8.Nh3 (8.Bh3 Bd7=+) 8...e5=+ 9.Be2 Nbd7 10.g5 (10.d3 c6=+) 10...hg5 11.hg5 Ng8 (11...Ne4 12.f4–/+) 12.f4 Bd6 13.Bg4 (13.Bf3 Ne7=+) 13...Qe7 (13...ef4 14.Bg7 Rh7=+) 14.0–0 (14.Qe2!?=) 14...f6 (14...Nb6 15.Bc8 Rc8 16.Qg4–/+) 15.Nc3 Nb6 16.Qf3 Bg4 (16...e4 17.Qg3–+) 17.Qg4 Qd7 (17...Nc4 18.Nd5 Qd7 19.Qd7 Kd7 20.fe5 fe5 21.Bc1 Rh3 22.d3–+) 18.Qd7=+ Kd7 19.Kg2 Ne7 (19...Nc4 20.Bc1 ef4 21.ef4=+) 20.Ne2 (20.fe5 Be5 21.d4 Bd6=+) 20...Nc4 21.Bc3 (21.fe5!? fe5 22.Bc1–/+) 21...Rh4 22.fe5 (22.Nhg1 ef4 23.ef4 fg5–+ (worse 23...Na3 24.gf6 gf6 25.Bf6–+; 23...Ba3?! 24.gf6 gf6 25.Bf6 Rg4 26.Kf2–/+)) 22...fe5 23.Rf7 Rah8 24.Rh1 (24.Nhg1 R8h7 25.Ng3–+) 24...R8h6?? (better 24...Na3 25.Rg7 Nc2–+) 25.gh6+– gh6 (25...Rh6 26.Rg7 Na3 27.Rg4+–) 26.Nf2 (better 26.Kg3 Rh3 27.Rh3 Na3 28.Rh6 Nb5 29.Kf2+–) 26...Rg4?? (better 26...Rh1 27.Kh1 Na3+–) 27.Ng4 1–0. FeegLood (2560) – potpiedude (2305), lichess.org, 2015.

4.e3 Bf5

5.a3 Nd7 6.c4 (6.Nf3 Ngf6 7.Be2 e6 8.0–0 Bg4 9.h3=) 6...dc4 (6...e6 7.Nf3 Ngf6 8.cd5 Nd5 9.d3=) 7.Bc4 (7.Qf3 e6 8.Qb7 Ne7 9.Qf3=) 7...Nb6 (7...e6 8.Nf3 Ngf6 9.0–0=) 8.Be2 Bd3 (8...Nf6 9.Nf3=) 9.Nc3 (9.Bd4 Be2 10.Qe2 Qd6+=) 9...e5 (9...Nc4 10.Bc1+=) 10.Bd3= Qd3 11.Qe2 0–0–0 (11...Qg6 12.f3=) 12.Qd3 Rd3 13.Ke2 Rd7 14.Nf3 f6 15.d4 ed4 16.Nd4 Bd6 17.h3 Nh6 18.Rhd1 Re8 19.Kf3 Nf7 20.Nf5 Bf8 21.Rd7+= Kd7 22.Rd1 Kc8 23.Nd5 Nc4+= 24.Rc1 Ng5–/+ 25.Ke2 Nb2 26.Rc7 Kb8–+ 27.b6 Ne6 28.Ng7? Bg7 29.Rc2 Nd4 (29...Nd4 30.Kd2 Nc2 31.Kc2 Re5–+) 0–1. Woloszyn,P (1795) – Warakomski,T (2495), 7th Amplico AIG Life, 2007.

5.a3 e6 6.Nf3 Nf6 7.Be2 Bg4 8.h3 Bf3 9.Bf3 =.

5.Be2 f6 6.Ba3 e5 7.Bf8 Kf8 8.d4 c6 9.de5 =.

5.Nf3 Nd7 6.Nh4 Bg6 7.c4 dc4 8.Ng6 hg6 9.Qf3 Rh5 (better 9...Rb8!?+=) 10.Bc4+– (10.Qb7?! Rb8 11.Qe4 Rhb5=) 10...e6 11.Qb7 Rb8 12.Qe4 Ngf6 13.Qc2 Bd6 14.Be2 (14.Qa4?! Nb6 15.Qc2 Nc4 16.Qc4 Rhb5 17.Bf6 Qf6+=) 14...Rh4 15.g3 Rh3 16.Qa4 Ke7 (16...c6 17.Bf6 Qf6 18.Nc3 cb5 19.Bb5+–) 17.Nc3 (17.Bf1!? Rh5+–) 17...Qh8 18.Ne4 Rh2 19.Rf1 1–0. pvanr (1935) – cuilin (1925), gameknot.com, 2012.

5.Nf3 e6 6.Be2 Nf6 7.Nh4 Be4 8.d3 Bg6 9.0–0 =.

3.Bb2 b6

4.a4 c5 5.bc6 Nc6 6.Nf3 Nf6 7.d4 (7.e3!?=) 7...Ba6=+ 8.g3 Ne4 9.Bg2 e6 10.0–0 Be7 11.e3? (better 11.Nbd2=) 11...Bf1–+ 12.Bf1 0–0 13.Nbd2 Nd2 14.Qd2 Rc8 15.c4 (15.Rc1 Rc7–+) 15...Bb4 (15...dc4 16.Qc1–+) 16.Qd1 (16.Qe2 dc4 17.Qc4 Ne5–+) 16...dc4 17.Rc1 c3! 18.Ba1 (18.Bc3 Bc3 Combination) 18...Ne7 19.Ne5 f6 (19...Nd5 20.e4 Nf6 21.f3–+) 20.Nd3 (20.Nc4 e5!–+) 20...Nd5 (20...Qd5 21.Qc2–+) 21.Qb3 (21.e4 c2! 22.Rc2 Nc3 23.Bc3 Bc3–/+) 21...Qd6 (21...f5!? 22.Bg2–+) 22.e4 Ne7 (better 22...Nc7 23.Bc3 Bc3 24.Qc3 Rfd8–+) 23.d5? (better 23.Nf4 Qd4 24.Ne6 Qe4 25.Ba6–/+) 23...ed5 24.Bc3 (24.Bg2 Rc4–+) 24...Bc3 25.Rc3 Rc3 26.Qc3 de4 27.Nf4 Kh8 28.Bb5 Nd5 (28...Rd8 29.Qc4 g5 30.Ne6 Qd1 31.Qf1–+) 29.Nd5 (29.Qd4 Rd8 30.Nd5 Qd5 31.Qb6 Rc8–+) 29...Qd5 30.Kf1 Qd1 31.Qe1 (31.Kg2 Rd8–+) 31...Rd8 (31...Qf3!? 32.Qd2 Qh1 33.Ke2 Qh2 34.Qd4 Qh5 35.Ke3 Qf3 36.Kd2–+) 32.Qd1 Rd1 33.Ke2 Ra1 34.h4 f5 35.Ke3 Rd1 36.f3 ef3 37.Kf3 g6 38.g4 (38.Ke2 Rc1–+) 38...fg4 (38...Rd5 39.Bc6 Rd3 40.Ke2–+) 39.Kg4 Kg7 40.h5 (40.Kg3 Rb1 41.Bc6 Rb3 42.Kf4 h5–+) 40...Rd4 41.Kg5 (41.Kg3–+) 41…h6 0–1. alessandrocarvalhaes (1880) – PermaisuriPutih (1835), lichess.org, 2019.

4.a4 e6 5.e3 c6 6.Nf3+= cb5 7.ab5 (7.Bb5 Bd7+=) 7...Bd7 (7...Nf6 8.Bd3=) 8.c4 (8.Nc3 Nf6+=) 8...Nf6= 9.cd5 ed5 10.Nc3 Bb4 11.Be2 0–0 12.Qb3 The isolani on d5 becomes a target 12...Be6 13.Nd4 Nbd7 (13...Qd6 14.Ne6 Qe6 15.0–0=) 14.Bf3 Increasing the pressure on the isolated pawn on d5 (14.Nc6 Qe8 15.Nb4 d4+–) 14...Qc7 (better 14...Ne5=) 15.Nd5?? (better 15.Bd5 Nd5 16.Nd5+=) 15...Bd5–+ 16.Bd5 Nd5?? (16...Nc5 17.Qc4 Nd5 18.Qd5 Nd3 19.Ke2 Nb2–/+) 17.Qd5+– Nc5 18.Nc6 (18.0–0 Rfd8 (18...Bd2? 19.Nc6+–) 19.Qc6 Qd6+–) 18...Rad8 19.Qe5?? (19.Qd8 Rd8) 19...Qe5 (better 19...Nd3 20.Kf1 Ne5 21.Be5 Qd7–+) 20.Be5=+ (20.Ne5? Rd2 21.0–0 Rb2–+) 20...Nd3 21.Ke2 Ne5 22.Ne5 Rd2 (worse 22...Bd2 23.Rad1 Bb4 24.Nd7+–) 23.Kf3 f6 (23...Rd5 24.Nc6=+) 24.Nc6= Bd6 (24...Rd5 25.Nb4 ab4 26.Rhb1 Rf5 27.Kg3 Rb5 28.Ra4=) 25.Rhd1 Rd1 26.Rd1 Bc5 27.g3 (27.Nd8 Re8=) 27...h6 (27...a4 28.Ke4=) 28.Rd7 (28.Ra1 Rc8=) 28...Ra8 29.Ne7? (better 29.Rd5 Bf8 30.Rd2=) 29...Be7–+ 30.Re7 a4 31.Rd7 a3 (31...Ra5 32.Rd2 Rb5 33.Ke4–+) 32.Rd1–/+ a2 33.Ra1 Ra5 34.Ke2 Kf7 35.Kd3 Ke6 36.Kc4 Kd6 37.f4 f5 38.Kd4 (38.h3 g6–/+) 38...g6 (38...Ra4 39.Kc3–+) 39.h3 (39.Kc4!?–/+) 39...Ra4–+ 40.Kd3 (better 40.Kc3–+) 40...Kc5 41.g4 Kb5 42.gf5 gf5 43.Rc1 (43.Kc3–+) 43...Ra3 (43...a1R!? 44.Ra1 Ra1 45.Kd4–+) 44.Rc3 (44.Kd4 a1Q 45.Ra1 Ra1 46.h4–+) 44…Rc3 (44...Rc3 45.Kc3 a1Q 46.Kd3 Qd1 47.Kc3 Kc5 48.h4 b5 49.h5 b4 50.Kb2 b3 51.Ka3 Qc2 52.e4 Qa2) 0–1. RichardSommer (1985) – Peanut_Jam (1925), lichess.org, 2020.

4.e3 c5 5.Nf3 Bg4 (5...Nf6 6.Be2=) 6.Be2 Nd7 7.0–0 f6 (7...e6 8.h3 Bf3 9.Bf3+= (worse 9.gf3 Qh4=+)) 8.h3 Bh5 9.g4 (9.c4!? dc4 10.Bc4+=) 9...Bg6 10.d4 (10.c4 e5=) 10...c4 (10...Rc8 11.Nbd2=) 11.Nh4 (11.Nfd2 e6=) 11...e6 12.f4 Bd6 (12...Qc7 13.Nc3=) 13.f5 ef5 14.Nf5 Bf5 15.Rf5 (15.gf5 Ne7=) 15...Ne7 16.Rf1 Qc7 17.Rf2 0–0 18.Nc3 (18.Bf3 f5 19.Nc3=+) 18...Bg3 (18...Bb4!? 19.Kg2 f5=+) 19.Rg2= Bh4?? (19...f5 20.Bf3 Nf6 21.gf5=+) 20.e4?? (better 20.Ba3 f5 21.Be7 Be7 22.Nd5+–) 20...de4+= 21.Ne4 (21.Ba3 f5 22.Be7 Be7 23.Nd5=) 21...c3 (21...Nd5!? 22.Ba3 Rfe8=+) 22.Bc1 (22.Ba3!? f5 23.gf5+–) 22...Nd5 23.Qd3 (better 23.Qf1 f5 24.gf5+=) 23...Nb4? (23...Rac8 24.Qf3 Nb4 25.Bf1+=) 24.Qd1?? (better 24.Qc4 Qc4 25.Bc4 Kh8 26.Nd6+– (26.Nc3?! Rac8 27.Be6 Rc3 28.Bd7 Rc2+=)) 24...Rad8 (24...Rae8 25.Bd3=+) 25.Ba3 (25.a3!? Nd5 26.Qf1=) 25...Ne5 (25...Qf4 26.Bc4 Kh8 27.Bb4 ab4 28.Qe2–/+) 26.Bb4 ab4 27.a3 (27.d5 Nf7 28.Qd4=+) 27...ba3 (better 27...Qb7!? 28.Nf2 Qe7–/+) 28.Ra3= Nc4?? (better 28...Qe7 29.Rc3 Qb4=) 29.Rc3+– Qe7 (29...Nb2 30.Rc7 Nd1 31.Bd1 Rd4 32.Bf3+–) 30.Bc4 (30.Rc4?! Qe4 31.Qd3 Qf4+–) 30...Kh8 31.Re2 Qb4 32.Qd3 f5 33.gf5 Rf5 34.Kh2 (34.Rb3 Qf8+–) 34...Qf8 35.Be6 Rf4 36.Bg4 (36.d5 Rf1+–) 36...Bf6 37.Nf6 Qf6 (37...Rf6 38.Qe3+–) 38.Qe3 (38.Rc6 Qf7+–) 38...Rfd4 (38...Qd6 39.Qe5 Rd4 40.Rc6+–) 39.Qe8 (39.Qe8 Qf8 40.Qf8 Rf8 41.Rc7+–) 1–0. e4_e5_f4 (1715) – Ilockandia52 (1730), lichess.org, 2020.

4.e3 c6 5.a4 c5 6.c4 d4 (better 6...e6!?=) 7.ed4+– cd4 8.Nf3 Qc7 (8...e5 9.Ne5 Ra7 10.f4+–) 9.Nd4 (9.Bd4 Nd7+–) 9...Bb7 10.Nf3 Nd7 11.d4 Ngf6 12.Nbd2 e6 13.Be2 Bb4 14.0–0 h5 (14...0–0 15.Ba3+–) 15.Rc1 Ng4 16.d5 Nc5 17.h3 (17.Bg7 Rg8 18.Bc3+–) 17...0–0–0? (better 17...Nf6!?+–) 18.hg4+– f6? (18...hg4 19.Ne5+–) 19.gh5 (better 19.g5!? fg5 20.Be5 Qe7+–) 19...Rh5 20.g3 Rdh8 21.Kg2 (better 21.Re1+–) 21...ed5+– 22.cd5?? (22.Nb1+–) 22...Bd5?? (22...Qd7 23.Nh4 Rd5–+) 23.Qc2?? (better 23.Rg1!?+–) 23...g5 (23...Rh2! 24.Kg1 Rh1 25.Kg2 R8h2) 24.Qf5 (24.Rh1 g4 25.Rh5 Rh5 26.Qg6+= (26.Bf6 Bd2 27.Qd2 gf3 28.Bf3 Bf3 29.Kf3 Rf5 30.Kg2 Rf6–+)) 24...Qd7= 25.Qd7 Kd7 26.Rcd1?? (better 26.Rg1 g4 27.Kf1 gf3 28.Nf3+–) 26...g4 (26...Rh2 27.Kg1 Rh1 28.Kg2 R8h2) 27.Bf6?? (better 27.Rg1 Ke7 28.Kf1 Na4 29.Bd4 gf3 30.Nf3=+) 27...Rh2 28.Kg1 Rh1 29.Kg2 R8h2 0–1. GuestPPCJ – GuestQZTX, freechess.org, 2017.

4.e3 Nf6 5.Nf3 Nbd7 6.c4 (6.Be2 e6+=) 6...e6= 7.cd5 Nd5 8.Nc3 Bb7 9.Be2 N7f6 10.h3 (10.0–0 Bd6=) 10...Nc3 (10...Bd6 11.0–0=) 11.Bc3 g6 (11...Ne4 12.Bd4=) 12.g4 (12.0–0 c5+=) 12...Bb4 (12...h6 13.d3=) 13.Bb2 (13.a3 Bc3 14.dc3 Nd5+=) 13...0–0 14.Rg1 (14.a3 Bd6=) 14...a4 (14...c6 15.g5 Nd5 16.bc6 Bc6 17.Ne5+=) 15.a3= Ba5 (15...Be7 16.Qc2=) 16.Rc1 (16.g5 Ne4=) 16...Ne4 17.Be5 (17.Qc2 f6=) 17...Rc8 18.Rc4 f6 19.Bb2 Bd5 20.Re4? ( 20.Ra4!? Nc5 21.Ra5 Bf3 22.d4 Be2 23.Qe2 ba5 24.dc5=+) 20...Be4–/+ 21.Nd4 Qd5 22.f3 Qa2 23.Qc1 Bd5 24.Bc3? Bc3–+ 25.Qc3 c5 26.Nc6 Rce8 27.Kf2 e5 28.e4 Be6 29.Ra1 Qb3 30.Qc1 Bf7 31.Rb1 Qa2 32.Ra1 Qe6 33.d3 Rc8 34.Qc2 Ra8 35.Rb1 Kh8 36.Qd2 g5 37.Rh1 Qb3 38.Qc1 Rfe8 39.d4 ed4 40.Nd4 cd4 41.Rd1 Rac8 42.Qd2 Red8 43.Qb4 Qe3 (44.Kf1 d3–+) 0–1. Engles,Michael – Satterfield,Don, IECC, 2001.

4.Nf3 Nd7 5.e3 Bb7 6.Be2 Ngf6 7.0–0 e6 8.Nd4 Bd6 9.Nc6 Bc6 10.bc6 Ne5 11.Bb5 0–0 12.f4 Nc4 (12...Ng6 13.c4=) 13.Bc4+= dc4 14.Qe2 b5 15.a4 Qb8 (15...ba4!? 16.Qc4 a3+=) 16.Bf6+– gf6 17.Nc3 ba4 (17...b4 18.Ne4 Be7 19.Rf3+–) 18.Ra4 (worse 18.Na4 Qb5+=) 18...Bb4 19.Qc4 Qb6 (19...f5 20.Rb1+–) 20.f5 e5?? (better 20...Qc5 21.Qc5 Bc5+–) 21.Nd5 Qc5 22.Nf6 Kh8 (22...Kg7 23.Qh4 Rfd8 24.Qg5 Kf8 25.Nh7 Ke8 26.Nf6 Kf8 27.Nd7 Rd7 28.cd7 Qc2 29.d8Q Rd8 30.Qd8 Kg7 31.Rb4 ab4 32.f6 Kh6 33.Qf8 Kg5 34.Qf7 Qg6+–) 23.Qh4 (23.Qh4 Qe3 24.de3 Kg7 25.Qg5 Kh8 26.Qh6 Rfd8 27.Qh7) 1–0. DEFFM – GuestGKVJ, freechess.org, 2018.

4.e3 Bd7

5.Nf3+= c6 6.a4 f6 7.c4 (7.bc6 Nc6 8.Nc3 e6+=) 7...e6 (7...e5 8.bc6 Bc6 9.Nc3+=) 8.cd5 (8.Nc3 Ne7+=) 8...ed5 (8...cd5 9.Bd3 Ne7 10.Nh4+=) 9.Bd3 (9.Nc3 Ne7+–) 9...Bd6 (9...Ne7 10.Nc3+=) 10.Ng5! Nh6 (10...fg5 11.Bg7 Combination) 11.Qh5+– Ke7 12.Nh7 Bg4? (better 12...Qg8 13.Qg6 Be5 14.Be5 fe5 15.Qg5 Kd6+–) 13.Qg6+– Nd7 (13...Qg8 14.Bf6! gf6 15.Qf6 Kd7 16.Qh6 Kc7+–) 14.Qg7 Nf7 15.Qg4 Qg8 (15...Nde5 16.Qf5 Nd3 17.Qd3+–) 16.Qd7! Kd7 17.Nf6 Kc7 18.Ng8 Rag8 (18...Rhg8 19.Bf1+–) 19.Bh8 Nh8 20.0–0 (better 20.g3 Be5 21.Nc3 Nf7+–) 20...c5 (20...Be5 21.Nc3+–) 21.Nc3 d4 22.Nd5 Kd7 (22...Kb7+–) 23.Nf6 (23.Nf6 Ke7 24.Ng8 Kf7 25.Nh6 Kf6 26.ed4+–) 1–0. Anonymous – Anonymous, lichess.org, 2020.

5.Nf3 c6 6.a4 Nf6 7.Ne5 (7...c5 8.d4+=). mrkt – kiki74, zagraj.pl, 2006.

5.Nf3+= c6 6.Ne5 A) 6...cb5? 7.Nf7 (7.Nd7?! Qd7 8.a3 Na6+=) 7...Kf7 8.Qh5 Ke6 9.Qe5 Kf7 10.Qd5 e6 11.Qa8+–; B) 6...Nf6+=.

5.Nf3 Nf6 6.Be2+=.

5.Nf3+= Nf6 6.Ne5+=.

4.e3 e6

5.Nf3 Ne7 (5...Nf6 6.Be2=) 6.c4 Nf5 (6...c6 7.Nc3+=) 7.Qc2 (better 7.cd5 Qd5 8.Nc3+=) 7...Nd7? (better 7...dc4!? 8.Bc4 Bb7+=) 8.cd5+– Nc5 (8...Bb7 9.Nc3+–) 9.d4 (9.de6 Be6 10.d4 Nb7+–) 9...Nb7 10.de6 Be6 (10...Bb4 11.Nbd2 Be6 12.d5+–) 11.Qc6 Ke7 (11...Qd7 12.e4 (12.Qb7?! Bd5 13.Ne5 Bb7 14.Nd7 Kd7+–) 12...Bb4 13.Nc3+–) 12.e4 (12.Qb7?! Bd5 13.Qa8 Qa8+=) 12...Nfd6 13.e5 Nc4 (13...Bd7 14.ed6 Nd6+–) 14.Bc4 (14.Bc4 Bc4 15.Ba3 (15.Qb7 Bd5 16.Qa8 Qa8=+) 15...Nd6 16.Qc4+–; 14.Qb7 Bd5 15.Qd5 Qd5+–) 1–0. Lea,Per – Koenig,Helmut, corr, 1982.

5.Nf3 Nf6 6.c4 dc4 7.Bc4 Be7 8.0–0 0–0 9.d4 Bb7 10.Nbd2 Nd5 (10...c6 11.Rc1=) 11.e4+= Nf6 12.Qc2 Nbd7 (12...c6 13.Bd3+=) 13.Bd3 g6 14.Nc4 Rc8 15.Qe2 (15.Nce5 Nb8+–) 15...Bb4 (15...c6 16.bc6 Rc6 17.Nce5 Ne5 18.Ne5+–) 16.a3 Be7 17.Nfe5 Ne5 18.Ne5 White is in command 18...Nd7 19.Nc6 Bc6 20.bc6 Nf6 21.Ba6 Ra8 22.Bb7 Rb8 23.Rad1 Nh5 24.f4 White prepares d5 (24.Qf3 Qd6+–) 24...Ng7 25.Kh1 Bf6 26.Qc4 White intends d5 (26.Qf3 Qe8+–) 26...Be7 (26...Qe8!?+–) 27.d5+– ed5 28.Rd5 (28.ed5?! Nf5 29.Qc3 f6+–; 28.Qd5?! Qd5 29.ed5 Bd6+–) 28...Qe8 29.f5 g5?? (better 29...Bd6+–) 30.f6 Bf6 31.Rf6 h6 (31...Rd8 32.Rg5 Rd1 33.Rf1 Rf1 34.Qf1 f6 35.Bf6 Rf7+–) 32.Rh6 Rb7 (32...Rd8 33.h4 Rd5 34.Qd5 Qd8+–) 33.Rg5 Qe4 (33...Qe5 34.Be5 Rd8 35.Rg7 Kf8 36.Qf7) 1–0. DEFFM – GuestSVPW, freechess.org, 2020.

3.Bb2 c5

4.a4 Nd7 5.e3 b6 6.c4 e6 7.Nf3 Ndf6 (7...Ngf6 8.Nc3=) 8.Be2+= Bd6 9.0–0 Ne7 10.d4 dc4 (10...cd4 11.Bd4 Bb7 12.Nbd2+=) 11.Bc4 (11.dc5 Bc5 12.Qd8 Kd8+–) 11...0–0 (11...cd4 12.Qd4 Bb7 13.Nbd2=) 12.h3 (12.dc5 Bc5 13.Bf6 gf6+=) 12...Bb7 (12...cd4 13.Qd4 (worse 13.ed4 Bb7=+) 13...Bb7 14.Nbd2=) 13.Be2 (13.dc5!? Bc5 14.Bf6 gf6 15.Nbd2+=) 13...cd4= 14.Nd4 e5 (14...Rc8 15.Nd2=) 15.Nf3 (15.Bf3 e4 16.Be2 Rc8=) 15...e4 16.Nd4 Rc8 17.Nc3 Qc7 18.f3 (18.Rc1 Qd7=) 18...ef3 (18...Nh5 19.f4 Ng3 20.Rf2=+) 19.Bf3= Rfd8 20.Bb7 Qb7 21.Qf3 Qf3 22.Rf3 (22.gf3 Bb4 23.Rac1 Bc3 24.Bc3 Nd7=) 22...Nfd5 (22...Nd7!?=+) 23.Nd5= Nd5 24.Nc6 Re8? Attacking the isolated pawn on e3 (24...Rd7 25.Rd1 Bc5+=) 25.Raf1?? (better 25.Rd1!? Ne3 26.Rd6+–) 25...f6 (25...Ne3 26.Rf7 Nf1 27.Rg7 Kf8 28.Kf1=) 26.Bd4 (26.Rd1 Ne3 27.Rd6 Nc4+–) 26...Bc5 (26...Kf7 27.Rd1 Bb4 28.Kf2= (worse 28.Nb4 ab4 29.g4 Nc3=+)) 27.Rc1 (27.Bc5 bc5 28.Rc1 Nb6 29.Rc5 Ra8+=) 27...Bd4+= 28.ed4 The passed pawn on d4 quickly leads to threats (28.Nd4?? Rc1 29.Kf2 Rc4–+) 28...Re4? (better 28...Kf8+=) 29.Rf5+– Ne3 30.Rf3?? (30.Ne7 Kf8 31.Rc8 Ke7+–) 30...Kf7?? (30...Nd5 31.Rc2 Rce8 32.Kf2=) 31.Kf2?? (31.Ne5 Re5 32.Rc8 Re4+–) 31...Nd5? (better 31...Rce8+=) 32.Rf5?? (better 32.Ne5! Ke6 33.Rc8 fe5 34.Rc6 Ke7 35.Rf5 Rd4 36.Re5 Kd7 37.Rh5+–) 32...Ne7–/+ 33.Rf3 Nc6 (better 33...Rd4! 34.Re3 Nc6 35.bc6 Ra4–/+) 34.Rc6= (worse 34.bc6 Rd4 35.Rb3 Rb4=+) 34...Rc6 35.bc6 Rd4 The passed pawn on c6 will quickly become a dangerous weapon 36.Rc3 Rd8 (36...Ra4?? 37.c7 Rf4 38.Ke3+–) 37.c7 (37.Rb3 Rb8=) 37...Rc8=+ 38.Rc6 Ke7 39.Rb6 Rc7 40.Ra6 (40.Rb5 Ra7=+) 40...Rc2 41.Kg3 Rc3 42.Kf2 Rc5 43.h4 (43.Ra7 Kf8–/+) 43...h5 44.Kg3 g5 45.hg5 fg5 46.Kh3 Rc3 (46...h4 47.Ra7 Ke6 48.Ra6 Kd5 49.Rb6–+) 47.g3?? (better 47.Kh2=) 47...Rc5 (47...h4!? 48.Ra5 Rg3 49.Kh2–+) 48.Kg2 Kd7 49.Kf3 Kc7 50.Ke3 (50.Kf2 h4–/+) 50...Kb7 (50...h4!? 51.gh4 gh4 52.Ra8–+) 51.Rg6–/+ Rf5 (51...Rc3 52.Kf2 g4 53.Rg5–/+) 52.Rh6 (52.Ke4 Rc5 53.Ke3 Rc3 54.Kf2 g4–/+) 52...Rc5 (52...g4!?–/+) 53.Rh5 Kc6 54.Rh6 Kd5 55.Rb6 Kc4 56.Ke4 (56.Rb7 Rd5=) 56...Kc3=+ 57.Rb5 Kc4 (57...Rc4 58.Ke3 Ra4 59.Rc5 Kb4 60.Rg5=+) 58.Rc5 Kc5 59.Kf5 Kb4 60.Kg5 The passed pawn on g3 will quickly become a dangerous weapon 60...Ka4 61.Kh6 Kb3 62.g4 a4 63.g5 a3 64.g6 a2 65.g7 a1Q 66.g8Q Ka3 67.Qf8 Kb2 68.Qf2 Ka3 69.Qc5 Ka2 70.Qc4 Kb1 71.Qf1 Ka2 72.Qf2 Kb1 73.Qf5 Ka2 74.Qe6 Kb1 75.Qb6 Ka2 76.Qa5 Kb1 77.Qd2 (77.Qd2 Qf6 78.Kh5 Qf5 79.Kh4 Qe4 80.Kg5 Qe5 81.Kg4 Qe6 82.Kg3=) 1–0. RichardSommer (2225) – Gricricri (2200), lichess.org, 2020.

4.a4 e6 5.Nf3 Nf6 6.g3 (6.e3 Bd6=) 6...b6 (6...Bd6 7.Bg2=+) 7.Bg2= Bb7 8.0–0 Nbd7 9.d3 d4 (9...Bd6 10.e4 0–0 11.e5+–) 10.c3 (10.e3 de3 11.fe3 Be7+=) 10...e5= 11.cd4 ed4 12.e4 (12.e3 de3 13.fe3 Bd6+=) 12...Be7 13.Nbd2 0–0 14.Nc4 Qc7 15.Qe2 (15.Bc1 Rfe8=) 15...Rfe8 16.Rae1 Bf8 17.Bc1 Bd5 18.Bf4 Qb7 19.Nfd2 Ra7 20.Bd6 (20.Bh3 Be6 21.Be6 Re6=) 20...Be6 21.Bf8 Rf8 (21...Kf8 22.Nd6 Bg4 23.f3 (23.Nb7?! Be2 24.Re2 Rb7=) 23...Bf3 24.Nf3+– (< 24.Qf3 Ne5 25.Qd1 Qe7 26.Ne8 Qe8+–); 21...Nf8 22.Nd6 Bg4 23.f3 (23.Nb7?! Be2 24.Re2 Rb7+=; 23.Ne8?! Be2 24.Nf6 gf6 25.Re2 Qe7=) 23...Bf3 24.Qf3+–) 22.e5 Nd5 23.Ne4 Qb8 24.f4 Nb4 25.Ned6 Bd5 26.Bd5+/– Nd5 27.e6 N7f6 28.ef7+– Kh8 29.Qe8! Ne3? 30.Qb8 Rb8 31.Ne3 de3 32.Re3 Rf8 33.Re8 Nd7 34.Rfe1 g6 35.R1e7 Kg7 36.Rf8 Kf8 37.Re8 Kg7 38.Rg8 Kf6 39.f8Q Nf8 40.Rf8 Ke6 41.Rd8 1–0. grimstad – Bazza3, ChessWorld.net, 2005.

4.a4 Bg4 5.f3 Bf5 6.c4 d4 7.Qb3 h5 8.e4 Bh7 9.Nh3 e6 10.e5 g5 11.Bd3 g4 12.fg4 hg4 13.Nf2 Qg5 14.Be2 (14.Bh7 Rh7 15.Qg3 Bg7=+) 14...Nh6=+ 15.Qg3 Rg8 (15...Nd7 16.Bf3=+) 16.Bd3 Bd3 (16...Nf5 17.Bf5 Qf5 18.0–0–/+) 17.Nd3=+ Nf5 18.Qf4 ( 18.Qf2!?=+) 18...Qf4–+ 19.Nf4 Nd7 20.Nd3 Nh4 21.0–0 (21.Kd1 Bg7–/+) 21...Ng6–+ 22.Re1 Bg7 23.Ba3 (23.Ra3 Nge5 24.Ne5 Be5–+) 23...b6 24.Bc1 Nde5 25.Ne5 Ne5 26.Ra3 (26.Na3 Nd3 27.Re4 Bh6–+) 26...Nc4 27.d3 (27.Rb3 Ne5 28.d3 Rc8–+) 27...Na3 28.Na3 0–0–0 29.Nc4 Kb7 30.Re4 Bh8 (30...Bf8 31.Kf2 Rd5 32.Bf4–+) 31.g3 (31.Bf4 Rd7–+) 31...e5 32.Kg2 (32.Ne5 f5 33.Re1 Rge8–+) 32...f5 33.Re1 Rg6 34.Rf1 (34.Ne5 Re6 35.Nf7 Re1 36.Nd8 Ka8–+) 34...Rf8 35.Bd2 Bg7 36.Re1 Re6 37.Kf2 (37.Ba5 ba5 38.Na5 Kb6 39.Nc4 Ka7–+) 37...e4 38.Bf4 Bh6 39.Kg1 (39.Kg2 Bf4 40.gf4 Kc7–+) 39...Bf4 40.gf4 Rfe8 (40...Kc7 41.Kg2–+) 41.de4 fe4 42.Kg2 e3 43.f5 (43.Kg3 d3 44.f5 d2–+) 43...Rf6 44.Kg3 Rf5 ( 44...Re4 45.Kh4 Rf4–+) 45.Kh4?? (45.Nd6 Kc7 46.Nf5–+) 45...Rf4 (46.Nd6 Kb8 47.Ne8 d3 48.Re3 d2–+; 45...Rd5 46.Kg4 d3–+) 0–1. Volkov,VP – Soerensen,Joergen, corr ICCF WT–I–562, 1980.

4.c4 e6 5.Nf3 Nf6 6.e3 (--> 4.e3 e6 5.c4 Nf6 6.Nf3).

4.c4 Nf6 5.e3 e6 (--> 4.e3 e6 5.c4 Nf6).

4.d3 Nf6 5.Nd2 a4 6.e3 Nbd7 7.Ngf3 Qa5 8.Rb1 a3 9.Ba1 g6 10.Be2 Bg7 11.0–0 0–0 12.c4 e6 13.Rb3 Qc7 14.Qc1 b6 15.Ne1 Bb7 16.f4 e5 17.cd5 Nd5 18.Nc4 ef4 19.Bg7 Kg7 20.e4 Ne3 21.Ne3 fe3 22.Nc2 Qe5 23.Na3 Qd4 24.Nc2 Qa4 ( 24...Qe5!?=) 25.Qb2+/– (< 25.Ne3 Qa2 26.Rb2 Qe6+=; < 25.Qe3 Qa2 26.Na1 f5=+) 25...Kg8 26.a3 (26.Ne3?! Qa2 27.Nc4 h5=) 26...Rae8 27.Rc3 Ne5 28.Kh1 c4 29.dc4 Be4 30.Ne3 Qa8 31.Rd1 Rd8 32.Rcc1 Rfe8 33.Rd2 Rd2= 34.Qd2 Qa3 35.Rf1 Qc5 36.Rf6 Kg7 37.Rd6 Bd3?? 38.Rd5+– Qa3 39.Bd3 Qa1 40.Nf1 Ng4 41.Be2 Qf6 42.h3 Nf2 43.Kg1 Re4 44.Nh2 Rf4 45.Ng4 Ng4 1–0. Johannsen,Dennis (2115) – Diehl,Klaus (2105), Sparkassen op–A, 2000.

4.d4 Nd7 5.dc5 Nc5 6.Bd4 =.

4.d4 Bf5 5.Nf3 (5.dc5 Nf6+=) 5...Nf6 (5...Nd7 6.dc5 Nc5 7.Nd4=) 6.e3 (6.dc5 e6 7.Nh4 Be4=) 6...e6 7.Be2 Nbd7 8.0–0 c4 9.a4 (9.Ba3 Bb4=) 9...Ne4 (9...Bb4 10.c3 Bd6 11.Ba3 Ba3 12.Ra3=) 10.Nc3 Bd6 (10...Qf6 11.Ne4 Be4 12.Ba3=) 11.Ne4 Be4 12.Ne5 (12.Ba3 Ba3 13.Ra3 0–0=) 12...Qg5 (12...Ne5 13.de5 Qg5 14.f3=+) 13.Bf3 (13.Nf3 Bf3 14.Bf3 Qh4+=) 13...Ne5 (13...Be5 14.de5 Bf3 15.Qf3 Ne5 16.Be5 Qe5 17.Rfd1–/+) 14.Be4 Ng4 15.h3 Ne3! 16.Bc1 (16.fe3 Qe3) 16...Nd1–+ (16...de4?! 17.Be3 Qf6 18.Qg4–/+) 17.Bg5 Nf2 18.Bd5 Nh3 (18...ed5 19.Rf2) 19.gh3 ed5 20.Rae1 (20.Rf5 h6 21.Bd2 0–0–/+) 20...Kf8–+ 21.Rf5 h6 22.Bh4 g5 23.Bf2 Rd8 24.Kg2 Kg7 25.Rd5–/+ Bb4 26.Ree5 f6 27.Rf5 Rhe8 28.Kf3 Kg6 29.Bg3 Rc8 30.h4 Re6 31.h5 Kh5–+ 32.Rd7 Kg6 33.Rfd5 b6 34.Rb7 Rce8 35.Rdd7 h5 36.d5 Re3 37.Kg2 Re2 38.Kf1 Bc5 39.d6 h4 40.Rg7 Kf5 41.d7 hg3 42.de8Q Re8 43.Rbd7 Kg4 44.Rgf7 Bf2 45.Rd1 f5 46.Rc7 Kf3 (47.Rd3 cd3 48.cd3 g2#) 0–1. Papp,Gellert – Donka,Peter (2220), Debrecen–ch, 1994.

4.e3 Qc7 5.f4 Nf6 6.Nf3 Bg4 7.h3 (7.Be2 e6 8.Bf6 gf6 9.c4 dc4 10.Na3 Nd7=; 7.c4 Nbd7 8.cd5 Nd5 9.Nc3 e6 10.Nd5 ed5+=; 7.Be5 Qb6 8.h3 Bf3 9.Qf3 Nbd7 10.c4 e6=) 7...Bf3 8.Qf3 Nbd7 9.c4 (9.Be2 e5 10.fe5 Ne5+=) 9...dc4 (9...e5 10.g4 ef4= (10...h6 11.g5 hg5 12.fg5+=)) 10.Na3 (10.Bc4 Nb6+=) 10...e6 (10...e5=) 11.Nc4 Be7 12.b6 Qc6? (12...Nb6 13.Be5 Decoy) 13.Qc6+– bc6 14.Rb1 Rb8 15.Kf2 Nb6 (better 15...a4+–) 16.Bf6 Bf6 17.Rb6 (17.Nb6?! Bd8=) 17...Rb6 18.Nb6 Ke7 19.Bd3 Rb8 (19...Rd8 20.Ke2+–) 20.Rb1 1–0. Janek – Vesely, internet, 2016.

4.Nf3 f6 5.c4 d4 6.e3 e5 7.Bd3 g6 8.Qe2 a4 (8...Ne7!?+=) 9.ed4+/– cd4 10.Bd4 Qe7? ( 10...Ne7 11.Bc3 Be6+/–) 11.Ne5!+– Bg7 (11...fe5 12.Be5) 12.Nf3 Nh6 (12...Qe2 13.Be2 Ne7 14.0–0+–) 13.Qe7 Ke7 14.Nc3 Kf7 15.Be4 Re8 (15...Nf5 16.Bd5 Ke8 17.0–0–0+–) 16.0–0 Nd7 17.Rae1 Ne5 (17...Nf8 18.Bd5 Ne6 19.Ne4+–) 18.Bd5 Be6 19.Be5 Bd5 20.Nd5 Rac8 21.Bc3 Re1 22.Re1 Rc4 23.Ng5! fg5 24.Re7 Kg8 25.Rg7 Kf8 26.Rb7 Re4 27.Bg7 Ke8 28.Nf6 Kd8 29.Ne4 (29...Nf5 30.Bf6 Kc8 31.Rh7 g4 32.b6 Ne7 33.Nc5 Ng8 34.Rh8 g3 35.Rg8#) 1–0. pierre – tomas_567, internet, 2007.

4.a4 b6

5.e3 Bb7 6.c4 Nd7 7.Nf3 e6 8.Be2 f5 (8...dc4 9.0–0=) 9.0–0 Ngf6 10.d4 Be7 (10...Bd6 11.cd5 Bd5 12.Nc3+=) 11.Nc3+– 0–0? (11...Rc8+–) 12.h3?? (better 12.Ng5 Qc8 13.Ne6+–) 12...h6 13.dc5 bc5 (13...Nc5 14.Rc1=) 14.cd5 ed5 (14...Nd5 15.Nd5 Bd5 16.Qc2+=) 15.Qc2 (15.Nh4 Ne4 16.Ng6 Nc3 17.Bc3 Rf7+–) 15...Rc8 (15...f4!?+=) 16.Qf5+– Ne4? (better 16...Rf7+–) 17.Qe6+– Kh8 (17...Rf7 18.Ne4 Nf8 19.Qg4 de4 20.Rfd1+–) 18.Nd5 (better 18.Ne4 d4 19.ed4+–) 18...Bd5 (18...Bf6 19.Nf6 Nef6 20.Rfd1+–) 19.Qd5 (19.Qh6! Kg8 20.Qg7) 19...Ndf6 (19...Bf6 20.Qe4 Bb2 21.Rad1+–) 20.Qd8 Bd8 21.Rfd1 (21.Ne5 Re8+–) 21...Bb6 (21...c4 22.Bd4 c3 23.Rdc1+–) 22.Ne5 Kh7 (22...Rfe8 23.Nc4 Rb8 24.Be5+–) 23.Nc6 (better 23.f3 c4 24.Bd4 Bd4 25.Rd4 Nc5 26.Bc4 Rce8+–) 23...Kg6 (23...Rfe8 24.f3 Ng5 25.Kf2+–) 24.Bd3 (24.Ne7 Kf7 25.Nc8 Rc8+–) 24...Rfe8 25.f3 Kh5 (25...c4 26.Bc2 (worse 26.fe4 Be3 27.Kf1 cd3+–) 26...Be3 27.Kh1+–) 26.Be4 (26.fe4!? Kh4+–) 26...Ne4 Black gets in control 27.fe4 Re4 28.Bg7 Re3 29.Rd5 Kh4 (29...Kg6 30.Be5 Re8 31.Rd6 Kh7 32.Rd7 Kg6 33.Rf1 R8e5 34.Ne5 Re5 35.Rd6 Kg7 36.Rb6+–) 30.Bf6 (30.Rf1 Rf8 31.Bf8 Kg3 32.Bd6 Re5 33.Be5 Kh4 34.Bf6 Kg3 35.Rf3) 30...Kg3 31.Be5 (31.Rf1 Rf8 32.Rd7 Rf6 33.Rg7 Kh4 34.Rf6 Re1 35.Kf2 c4 36.Ke1 Be3 37.Nd4 Bd2 38.Ke2 Kh5 39.Nf5 c3 40.g4) 31...Kh4 32.Rf1 (32.Ne7 Re5 33.Re5 c4 34.Kh2 Bg1 35.Rg1 Rg8 36.Ng8 c3 37.g3) 32...c4 (32...Rg8 33.Rf4 Kh5 34.Rf6 Rh3 35.Bf4 Kh4 36.Ne7+–) 33.Rf4 (33.Bf6 Kg3 34.Bh4 Kh4 35.Rf4 Kg3 36.Rg4) 33...Kg3 Threatening mate... how? 34.Rf8 Re5 35.Kf1 (35.Kf1 Rf8; 35.Nd4 Rf8 36.Re5 Bd4 37.Re3 Be3 38.Kh1 Rf1) 1–0. RichardSommer (2025) – Smile_maker (2165), lichess.org, 2020.

5.e3 Bb7 6.Nf3 Nd7 7.c4 e6 8.Be2 Qc7 9.0–0 Ngf6 10.d4 (10.cd5 Bd5 11.d3 Bd6=) 10...Bd6 (10...dc4 11.dc5 Qc5 12.Nfd2=+) 11.Nbd2 g5 (better 11...cd4!? 12.ed4 0–0=) 12.dc5+– Bc5 13.cd5 Bd5 14.Nc4 Rg8 15.Rc1 Ne4 16.Nce5?? (better 16.Bd3+–) 16...g4–+ 17.Nd7 gf3 18.Bf3 Qd7 19.Qd3 f5 20.Rfd1 Rd8 21.Qe2 Qe7 22.g3 (22.Be5 Qg5–+) 22...Rd7 23.Be5 Ng5 (23...Bb3 24.Rd7 Qd7 25.Bd4 Bd4 26.ed4–+) 24.Bd5 Rd5 25.Bd4 Ne4 26.Kg2 Qb7 (26...Qg5 27.Bc5 Rc5 28.Rc5 Nc5 29.Rd6–+) 27.f3 Ng5 28.Bc5 bc5 29.Rd5 Qd5 (29...ed5?! 30.Rc5 Ne6 31.Rc6=) 30.Rd1 Qb7 (better 30...Qb3!?–+) 31.Rc1=+ Ke7 32.Rc5 Rd8 33.h4?? (better 33.e4=+) 33...Nf3!–+ 34.Rc6 (34.Qf3 Deflection from d2 34...Rd2) 34...Ne5 (34...Rd2 35.Kf3 Re2 36.Ke2–+) 35.Qb2 Rd5 36.e4 fe4 37.Kh3 Qd7 38.Rc2 e3 (38...Qd6 39.Qc1 Nf7 40.Rc7 Ke8 41.Ra7–+) 39.Re2 (39.Qa3 Ke8 40.Qe3 Qb7–+) 39...Nc4 (39...Rd4 40.Qa3 Qd6 41.Qe3–+) 40.Qg7 (40.Qc2 Qc8–+) 40...Kd6 41.Qf8 Kc7 42.Qf4 (42.Rc2 e5 43.g4 Rd4–+) 42...Nd6 (better 42...e5 43.Qg4 Qg4 44.Kg4 Rd2–+) 43.Qe3 e5 44.Kh2 Qg4 (better 44...Kb7!?–+) 45.Qa7–/+ Kd8 Threatening mate: Qxe2 46.Qa5 (46.Rf2 Qd7 47.Qa8 Nc8 48.Qa5 Ke8=+) 46...Kd7 47.Qa7 Ke6 48.Qe3? (better 48.Rg2 Rd4 49.Qh7 Ra4 50.Rd2–/+) 48...Nf5–+ Threatening mate: Nxe3 (48...Qa4? 49.Qh6 Ke7 50.Qg5 Kd7 51.Qg7 Ke6 52.Qg8 Nf7 53.Qe8 Kd6 54.Qc6 (54.Qf7?! Qb5 55.Ra2 Rd3+–) 54...Ke7 55.Qd5+–) 49.Qf2 (49.Qb6 Rd6 50.Qf2 Ng3 51.Re5 Ke5 52.Qg3 Qg3 53.Kg3 Rd4–+) 49...Rd3 (49...Ng3 50.Rb2 Qh4 51.Kg2 Qh1 52.Kg3 Rd3 53.Kg4 Qh3 54.Kg5 h6 55.Kg6 Qg4 56.Kh7 Rd7 57.Kh6 Qh3 58.Qh4 Qh4 59.Kg6 Qh7 60.Kg5 Rg7) 50.Rc2 Rg3?? (50...Nd4 51.Ra2 Nf3 52.Kg2 Nh4 53.Kh2 Nf3 54.Kg2 Qh5 55.Qb6 Kf5 56.g4 Qg4 57.Kf2 Qg1 58.Ke2 Qd1 59.Kf2 Qe1 60.Kg2 Nh4 61.Kh2 Qg3 62.Kh1 Rd1 63.Qg1 Rg1) 51.Rc6–/+ Nd6?? (51...Kf7 52.Qa2 Kg7 53.Rc7 Kh6 54.Rc6 Kh5 55.Qf7 Kh4 56.Qh7 Qh5 57.Rc4 Kg5 58.Qh5 Kh5=+) 52.Qa2 (better 52.Qg3 Qe2 53.Qg2 Qg2 54.Kg2+–) 52...Kd7 (52...Ke7 53.Qf7 Nf7 54.Rc7 Kd8 55.Rc8 Kc8 56.a5 Qh4) 53.Rd6 Kd6 54.Qd2 Ke7 55.Qg5 Qg5 56.hg5 Ra3 57.a5 Ra5 58.g6 (58.b6 Rb5 59.Kg3 Kf7–+) 58...hg6 59.Kg3 Rb5 60.Kg4 Kf6 (60...Rb3 61.Kg5 Kf7 62.Kh4 Kf6 63.Kg4 g5 64.Kh5 Rb4 65.Kh6 Rh4) 61.Kh4 Rb4 (61...Rb3 62.Kg4 g5 63.Kh5 Rb4 64.Kh6 Rh4) 62.Kg3–+ Rf4 63.Kg2 (63.Kh3 e4 64.Kh2 e3 65.Kg2 e2 66.Kg3 Kg5 67.Kg2 e1Q 68.Kh3 Qh1 69.Kg3 Rf3) 63...Kf5 64.Kg3 e4 65.Kg2 (65.Kh2 e3 66.Kg1 e2 67.Kg2 g5 68.Kh3 Rh4 69.Kg3 e1Q 70.Kf3 Rf4 71.Kg2 Rf2 72.Kh3 Qe3) ½–½. BeepBeepImAJeep (2555) – berval (2375), lichess.org, 2015.

5.e3 Nf6 6.f4 Bb7 (6...Bf5 7.Ne2=) 7.Nf3 Nbd7 8.Ra2 (8.Be2 e6=) 8...e6 9.c4 (9.Be2 Be7=) 9...Be7=+ 10.d3 0–0 (10...Qc7 11.Nbd2=+) 11.Nbd2 (11.Be2 dc4 12.dc4 Qb8=+) 11...Ng4 (12.Qe2 Rc8=+; 11...Qc7 12.Be2=+). Marder,Simon – Wartig,Wolfgang, corr 3GMM–42, 1995.

5.Nf3 Nd7 6.d3 Qc7 7.Nbd2 e5 8.g3 Ngf6 9.Bg2 h6 10.0–0 Bb7 11.Rc1 Bd6 12.c4 d4 13.Nh4 0–0–0 14.Bb7 Kb7 15.Qe1 g5 16.Ng2 Rhe8 17.e3 Ka7 18.e4 g4 19.Qe2 Nf8 20.Rfe1 Ng6 21.Nf1 Bf8 22.Rb1 h5 23.Bc1 Rd6 24.Bg5 Nh7 25.Qd2 Be7 26.Be7 Qe7 27.Qe2 Ng5 28.Nd2 Qf6 29.Rf1 Rd7 30.f3 gf3 31.Nf3 Nf3 32.Rf3 Qg5 33.Rbf1 Ree7 34.Rf5 Qg4 35.Qg4 hg4 36.Rg5 Kb7 37.Rg4 Kc7 38.Rf5 Re6 39.Nh4 Nh4 40.Rh4 f6 41.Rh6 Rf7 42.Kg2 Kd7 43.h4 Ke7 44.Kh3 Rd6 45.g4 Rd8 46.Kg3 Rg8 47.Rhh5 White intends g5 47...Rfg7 48.g5 Rg6 49.Kg4 Ke6 50.Rh7 fg5 51.hg5 R8g7 52.Rh8 Rg8 53.Rh7 R8g7 54.Rh5 Rg8 55.Kh4 R8g7 56.Rf8 Rg8 57.Rf5 R8g7 58.Rh8 Rg8 59.Rg8 Rg8 60.Kh5 Rh8 61.Kg6 Rg8 62.Kh7 Re8 63.Rf6 Ke7 64.Rb6 Rf8 65.Rf6! Rf6 66.gf6 Kf6 67.Kh6 Kf7 68.Kg5 Ke6 69.Kg6 Ke7 70.Kf5 Kd6 71.Kf6 Kd7 72.Ke5 Kc7 73.Kd5 Kb6 74.e5 Kc7 75.e6 Kd8 76.Kc5 Ke7 77.Kd5 Kd8 78.Kd4 Ke7 79.Kd5 Kd8 If Black now only could play Ke5... 80.Kd6 Ke8 81.d4 Kd8 82.d5 Ke8+– 83.c5 Kd8 84.c6 Ke8 85.c7 Kf8 86.c8Q Kg7 87.e7 Kf6 88.e8Q Kg5 89.Qg8 Kh6 90.Qce6 Kh5 91.Qeg6 Kh4 92.Q8h7# 1–0. linakip – dololer, kurnik, 2011.

5.Nf3 Bf5 =.

4.a4 d4

5.e3 e5 6.ed4 cd4 7.d3 f6 8.Nd2 b6 (8...Bb4 9.f4 Nh6 10.fe5 fe5 11.Rc1–/+) 9.Ngf3 (9.f4 Nd7=) 9...Bc5 (9...Bb4 10.Rc1=+) 10.Be2 Bb7 11.0–0 Nd7 (11...Ne7 12.c3 dc3 13.Bc3=) 12.Nb3 (12.c3 dc3 13.Bc3 Rc8+=) 12...Ne7 13.Nfd2 (13.Nc5 Nc5 14.Re1 0–0=+) 13...0–0 14.Bf3 Qc7 15.Bb7 Qb7 16.Ne4 Qc7 (16...Bb4 17.c3 dc3 18.Bc3=) 17.Rc1 Rac8 18.c3 dc3 19.Rc3 Nd5 20.Nbc5?? (20.Rc4 Qd8 21.d4 (worse 21.Nec5 Nc5 22.Ba3 Nb4+=) 21...ed4 22.Nd4+–) 20...Nc3–+ (20...Nc5?! 21.Rc4 Qd7 22.Nc5 bc5 23.Bc3=; 20...bc5 21.Qb3 N7b6 22.Rc5+– (22.Nc5?! Qf7 23.Rcc1 Nb4+=)) 21.Qb3 White launches an attack 21...Kh8 (21...Rf7 22.Bc3 Nc5 23.Nc5 Qc5 24.Bd2–+) 22.Ne6–/+ Ne4?? (better 22...Ne2 23.Kh1 Qc2 24.Qc2 Rc2 25.Nf8 Nf8–/+) 23.Nc7+– Nec5 24.Qd5 Rc7 25.Ba3 Rcc8 26.d4 ed4 27.Qd4 Rfd8 28.Rd1 Nb7?? (28...Ne6 29.Qe3 Ndc5 30.Rd8 Rd8 31.Kf1+–) 29.g3 (better 29.Be7 Nbc5 30.Bd8 Rd8 31.Qe3+–) 29...Ndc5 30.Qa1 (30.Qg4 Rd1 31.Qd1 Re8+–) 30...Na4 31.Rd8 Rd8 32.Be7 Re8 33.Qa4 Re7 34.Qd4 h5 35.Qb6 Kg8 36.Qc6 Kf7 37.Qd5 Kf8 (37...Kg6 38.b6+–) 38.Qh5 Kg8 (38...Rd7 39.Qg4 Ke8 40.b6+–) 39.Qd5 Kf8 40.b6 Ke8 41.Qc4 (41.h4 Kf8+–) 41...Kf8 (41...Kd7 42.Qc7 Ke6 43.Qc6 Nd6 44.f4+–) 42.Qc8 Kf7 43.Qc4?? (43.h3 Re1 44.Kh2 Re7+–) 43...Kf8 44.h4 Ke8 45.h5 Kf8 46.Qc8 (46.Qc8 Kf7 47.Kg2+–) 1–0. BeepBeepImAJeep (2625) – zsolti_83 (2435), lichess.org, 2016.

5.e3 e5 6.Nf3 Bd6 7.Bc4 (7.ed4 ed4 8.c3 dc3 9.Bc3 Nf6=) 7...Nf6 8.Na3 (8.ed4 cd4 9.c3 dc3 10.dc3 Qc7=) 8...0–0=+ 9.0–0 (9.ed4 cd4 10.0–0 Re8=+) 9...Bg4 (9...e4 10.Ne1=+) 10.h3= Bh5 (10...Bf5 11.d3=) 11.Be2 Re8 (11...de3 12.fe3 e4 13.Ne5 Be2 14.Qe2 Be5 15.Be5=) 12.Nc4 (12.Nd4 Be2 13.Ne2 Nbd7+–) 12...Bc7 (12...Bg6 13.Rb1=) 13.b6 (13.Nd4!? Be2 14.Ne2+–) 13...Bb6= 14.Nfe5 Be2 15.Qe2 Nc6 (15...Bc7 16.f4=) 16.Nc6+= bc6 17.Ba3 (17.Qf3 Rb8+=) 17...Bc7 (17...Rb8 18.Rfb1+=) 18.Bc5+= Qd5 (better 18...de3 19.fe3 Ne4+=) 19.Bd4?? (better 19.Bb6 Bd8 20.Qd3 de3 21.de3+–) 19...Qd4!–+ 20.ed4 Re2 21.Rfe1 Rae8 (21...Re1 22.Re1 Rb8 23.c3–/+) 22.Kf1 Re1 23.Re1 Re1 (23...Rb8 24.Ne5 Rb4 25.c3 Ra4 26.Nc6–/+) 24.Ke1 Kf8 25.g3 (25.Ne3 h5–/+) 25...Ke7 26.Ke2 Ke6 27.c3 Nd7 (27...Nd5–+) 28.Ne3 (better 28.d3!?–/+) 28...Nb6–+ 29.Kd3 (29.c4 g5–+) 29...Na4 30.f4 (30.Nc4 c5–+) 30...Nb6 31.f5 (31.c4 f5–+) 31...Kd7 (31...Kf6 32.g4–+) 32.Ke4 (32.g4 Nd5 33.Kc4 Nf4–+) 32...Bg3 33.Nc2 (33.c4 g6–+) 33...Bd6 (33...a4 34.d3–+) 34.d3 (34.Ne3 g6–+) 34...a4 35.c4 Be7 36.Ke5 Bf6 37.Ke4 Kc7 (37...g6 38.Kf4–+) 38.Ke3 (38.Kf4 Nc8–+) 38...Nd7 (38...Nc8 39.Kf3–+) 39.Kd2 c5 (39...g6!? 40.fg6 hg6 41.Ke2–+) 40.dc5 Nc5 41.d4 (41.Ke3 Nb7–+) 41...Nb3 42.Kc3 Nd4! 43.Nd4 a3 44.Kd3 (44.Kb3 Bd4 45.Ka3–+) 44...Bd4 45.Kd4 a2 46.Kd5 a1Q 47.c5 Qg1 (47...Qh1 48.Ke5–+) 48.Ke4 Qg2 49.Kf4 Qh3 50.f6 Qh6 51.Ke4 Qf6 52.Kd5 Qc6 (52...g5 53.Kc4–+) 53.Kc4 h5 54.Kb4 h4 55.Kc4 h3 (55...Qe4 56.Kc3 h3 57.Kb2 h2 58.c6 Qc4 59.Ka3 h1Q 60.Kb2 Qhc1) 56.Kd4 (56.Kc3 Qe4 57.Kd2 Qb4 58.Ke2 h2 59.c6 Qe4 60.Kd2 h1Q 61.Kc3 Qc1 62.Kb3 Qec4) 56...h2 57.Kc4 (57.Ke3 h1Q 58.Kd2 Qhg2 59.Kc3 Qc5 60.Kd3 Qgc2) 57...h1Q 58.Kb4 (58.Kc3 Qe1 59.Kc4 Qa4 60.Kd5 Qae4) 58...Qhd5 (58...Qe1 59.Kc4 Qa4 60.Kd5 Qae4) 59.Ka3 (59.Kc3 Qcc5 60.Kb2 Qd2 61.Kb3 Qcb4) 59...Qdc5 (59...Qb7 60.c6 Qbb3) 60.Kb2 (60.Ka2 Qc2 61.Ka3 Q6c3) 60...Q5b5 61.Ka3 Qca6 (61...Qa8) 0–1. FeegLood (2400) – AMADAN (2270), lichess.org, 2015.

5.e3 e5 6.Nf3 f6 (6...e4 7.Ne5=) 7.ed4 cd4 8.d3 (8.Bc4 Qc7 9.Qe2 Ne7=) 8...Bc5 9.Be2 Ne7 10.0–0 0–0 11.Nfd2 (11.c3 Nf5=) 11...Nd5 12.Nb3 Nd7 (12...Bb4 13.Bg4=+) 13.Nc5 (13.c3 dc3 14.Nc3 Nf4=) 13...Nc5=+ 14.Ba3 b6 15.Nd2 (15.Bf3 Be6=+) 15...Be6 (15...Nc3 16.Qe1 N3a4 17.f4 ef4 18.Bf3–/+) 16.Bf3 (16.Bc5 bc5 17.Bg4 f5=) 16...Rc8 17.Nc4 (17.Bd5 Bd5 18.f4 Qd6=+) 17...Re8 (17...Nc3 18.Qd2–/+) 18.Bd5 Bd5 (18...Qd5? 19.Nb6 Qb7 20.Nc8 Qc8 21.Bc5 Qc5 22.Qd2+–) 19.Qd2 (19.Bc5 Rc5 (19...bc5?! 20.Rb1=) 20.Na3 Rc3–/+) 19...Bc4–+ (19...Na4?! 20.Nd6=+) 20.dc4 Qd7 21.c3? (21.Bc5 Rc5 22.c3 Rd8–/+) 21...dc3?? (better 21...Nb3 22.Qe2 Na1 23.Ra1 d3–+) 22.Qc3–/+ Qe6 (22...Na4 23.Qb3 Nc5 24.Bc5 Rc5 25.Rfd1–/+) 23.Bc5 Rc5 Attacking the backward pawn on c4 (worse 23...bc5 24.Qa5 Qc4 25.Rfc1+–) 24.Rac1 Rec8 25.Qe3 Rc4 26.Rc4 Rc4 (worse 26...Qc4 27.Qb6 Ra8 28.Qd6=) 27.Rd1 (27.Qb3 Qf7–/+) 27...Rc8 (better 27...Ra4!? 28.Rd8 Kf7–+) 28.h3 Kf7 29.Qd3 Ke7 (better 29...Qc4!? 30.Qd7 Kg8=+) 30.Qh7+= Kf7 31.Qh5 Kf8 32.Qf3 Re8 (32...Qc4 33.Qf5+=) 33.Qb7 (33.Qa3 Qe7 34.Rd6 e4+=) 33...Re7 34.Qb8 Kf7 35.Rd6 Qb3 36.Qb6 Qa4 The passed pawn on b5 quickly leads to threats 37.Qc5 Qb4 38.Qd5 Kg6 39.b6 (39.Qd3 e4 40.Qg3 Kf7=) 39...Qe1= 40.Kh2 Qf2 41.Qd3 (41.Qa5 e4 42.Rd2 Qf4 43.g3 Qe3=) 41...Qf5 (41...e4 42.Qd1 Qf4 43.Kh1–/+) 42.Qg3 Kh7 (42...Qg5 43.Qe1 e4 44.Rd1=+) 43.Rd5 (43.Qh4 Kg8 44.Qc4 Kh8 45.Rd5=) 43...Qf4 (better 43...Rb7!?=+) 44.Ra5 (44.Qf4 ef4 45.Ra5 Rb7+=) 44...Rb7 45.Qf4 ef4 46.Rb5 g5 (46...Kg6 47.h4+=) 47.Rb4 (47.h4!?+–) 47...Kg6= 48.Kg1 Kh5 (better 48...Kf5!?=) 49.Kf2+– Kh4 (49...Kg6 50.Ke2+–) 50.Rb5 (better 50.Kf3!?+–) 50...f5+– 51.Kf3 (51.Kf3 Kh5 52.Rb1+–) 1–0. BeepBeepImAJeep (2595) – zsolti_83 (2460), lichess.org, 2016.

5.Nf3 b6 (5...Nd7 6.e3 e5 7.ed4 ed4 8.c3 Qe7 9.Qe2 dc3 10.Nc3+=) 6.e3+= e5 (6...de3 7.fe3 Nf6+=) 7.Be2 (better 7.Ne5!? Ra7 8.Be2+–) 7...e4 8.Ne5 Bb7 (8...Qg5 9.Bg4= (worse 9.ed4 Qg2 10.Rf1 Qh2=+)) 9.0–0 (9.Bc4 Bd5+–) 9...f6 (better 9...Be7+=) 10.Bh5 (better 10.Nc4+–) 10...Ke7?? (better 10...g6 11.Nc4 gh5 12.Qh5 Ke7 13.ed4 cd4 14.Ba3 Ke6 15.Bf8 Qf8 16.Nb6 Ra7=) 11.Nf7+– Qd5 12.Nh8 Qh5 (12...g6 13.Bg6! hg6 14.Ng6 Ke8 15.Nf8 Kf8 16.ed4 cd4+–) 13.Qh5 g6 14.Qh7 (14.Qh7 Ke8 15.Qb7+–) 1–0. Akrapovik (1665) – Iordan85 (1685), lichess.org, 2019.

4.a4 Bf5

5.e3 Nf6 6.c4 e6 7.Nf3 Nbd7 8.Be2 Nb6 9.cd5 Nbd5 10.0–0 b6 (10...Nb4 11.d4=) 11.Nc3 Nb4 12.d4 h6 13.Ne5 (13.Rc1 Rc8+=) 13...Bc2 (13...cd4 14.ed4 Rc8 15.Bf3=) 14.Qd2 Bb3 (14...cd4 15.ed4 Rc8 16.Bf3+=) 15.Bf3 Rc8 16.Nc6 Qd7 17.Nb4 (17.Rac1 Bd6+=) 17...ab4= 18.Ne2 (18.Bc6 Rc6 19.bc6 Qc6 20.dc5 bc3 21.Qc3 Bd5 (21...Ba4? 22.cb6 Ne4 23.Qa5+–) 22.cb6 Qb6 23.Qc8 Qd8=) 18...Bd6 (better 18...c4=+) 19.dc5?? (19.Nc1 Bd5 20.Bd5 Nd5 21.dc5 bc5+=) 19...bc5 (better 19...Bh2 20.Kh2 Qd2 21.Bf6 gf6 22.cb6 Qd6 23.Kg1 Bd5–+) 20.Bc6?? (better 20.Qc1+=) 20...Rc6–+ 21.bc6?? (better 21.Nd4 Bh2! 22.Kh2–+) 21...Qc6 (better 21...Bh2 22.Kh2 Qd2 23.Bf6 gf6–+) 22.Rac1 (better 22.a5=) 22...0–0?? (better 22...Ba4 23.Bf6 gf6=+) 23.Bf6+– gf6? (better 23...Qd5 24.Qd5 ed5+– (24...Bd5? 25.Rfd1+–)) 24.Qb4?? (better 24.Nd4!? Bh2 25.Kh1+–) 24...Qa4?? (24...Qg2! 25.Kg2 cb4=+) 25.Qb7 (better 25.Qb6!? Be7 26.Qc7+–) 25...Bd5+= 26.Qb1 Qa2? (26...Rb8!? 27.Qd3 Qh4+=) 27.Qd3 (27.Qa2 Ba2 28.Nc3 Bc4+–) 27...c4 28.Qd4?? (better 28.Qd1 Be5 29.Nc3 Bc3 30.Rc3+–) 28...Qe2–+ 29.Qg4?? (29.Qh4 Be5 30.Rfe1–+) 29...Kh7 (better 29...Qg4 30.f3 Qh5–+) 30.Qe2+– (30.Qe2 f5 31.f3+–) 1–0. KLINGON09 (1820) – wzzooun (1815), lichess.org, 2019.

5.e3 Nf6 6.Nf3 e6 7.c4 Nbd7 8.d3 Nb6 (8...Bd6 9.Be2=) 9.Nbd2 Be7 10.Ne5 h6 (10...Bd6 11.Be2=) 11.Be2 0–0 12.g4 (12.0–0 Qc7=) 12...Bh7 13.h4 dc4 14.Ndc4 Nc4 15.dc4 Ne4 16.Bf3 (16.g5 hg5 17.hg5 Ng5=) 16...Bh4 (16...Bd6 17.g5 Qc7 18.Nd3 hg5 19.Bg2=) 17.Be4 Be4 18.Qd8 Bd8 19.f3 Bh7 (19...f6 20.fe4 fe5 21.Rd1=) 20.Nd7 Re8 21.Nc5 Bb6?? (better 21...Be7 22.Nb7 Ra7=) 22.Nb7+– Be3 (22...Rec8!? 23.Nd6 Rd8+–) 23.c5+– f5 (23...Rec8 24.c6+–) 24.Ke2 Bf4 25.Bc3 (25.Rag1 Ra7 26.c6 Rb7 27.cb7 fg4 28.Bg7 Kg7 29.Rg4 Bg5+–) 25...fg4 26.fg4 Rec8 (26...Be4 27.Rhf1 Bb7 28.Rf4+–) 27.c6 (27.Rhd1 Be4 28.c6 Bc6 29.bc6 Rc6 30.Ba5 Rc2 31.Kf3 Be5+–) 27...Be4 28.Rh3 (better 28.Rhd1!? Bc6 29.bc6 Rc6 30.Ba5 Rc2 31.Kf3 Be5+–) 28...Bc6+– 29.bc6 Rc6 30.Na5?? (better 30.Rd1+–) 30...Rc3=+ 31.Rc3 Be5 32.Kd3 (32.Rca3 Ba1 33.Nc6 Bb2=) 32...Bc3= 33.Kc3 Ra5 34.Kb4 Ra8 35.a5 Kf7 36.a6 Kf6 (36...e5 37.Kc5 Kg6 38.Kb6+–) 37.Ra5 (37.Kc5 Kg5 38.Ra4 e5+–) 37...g6 (better 37...Ke7!?=) 38.a7 e5 39.Kc4 (39.Kc5!?+–) 39...h5 (39...Kg5 40.Re5 Kg4 41.Ra5+=) 40.gh5+– gh5 41.Kd3 (better 41.Kb5!?+–) 41...Kf5= 42.Ke3 Kg4 43.Ra4 Kg3 44.Ra6 h4 45.Rg6 Kh2 46.Rg7 h3 47.Kf2 Rf8 48.Ke3 Ra8 49.Kf2 Rc8 (49...Rf8 50.Ke2=) 50.Ke3 ½–½. Diviak,Rudolf (1865) – Nemsak,Denis (1915), 3rd Liga A2, 2012.

4.a4 Nf6

5.e3 b6 6.c4 Bb7 7.cd5 Nd5 8.Nf3 Nb4 9.d4 e6 10.Be2 Nd7 11.0–0 Be7 (11...cd4!? 12.Bd4 Rc8=) 12.dc5+= Nc5 13.Nd4 (13.Bg7!? Qd1 14.Rd1+=) 13...0–0 14.Bf3 Bf3 15.Qf3 Ncd3 16.Ba3 (16.Bc3 Bd6=) 16...Bc5 (16...Bf6 17.Bb4 ab4 18.Rd1 Bd4 19.ed4–/+) 17.Bb4= Nb4 18.Rd1 Qh4 19.Nc3 Rad8 20.Nce2 e5 21.Nc6 (21.Nf5!? Qg5 22.Neg3=) 21...Rd1 22.Rd1 e4 (22...Nc6 23.bc6 Qa4 24.Ng3–/+) 23.Qf4 (23.Qf5 g6 24.Qd7 Nd3=) 23...Qh5 (better 23...Qf4!? 24.Nf4 Nc6 25.bc6 Rc8=+) 24.Rd2= f5 25.Ned4 (25.Qc7 Qf7 26.Rd7 Qf6+=) 25...Nd3 26.Qg3 (26.Qc7 Qf7 27.Qf7 Rf7=) 26...Qf7 (26...Qh6 27.h3=+) 27.Ne5= Qd5 (27...f4 A) worse 28.Nf7 fg3 29.Ng5 Bd4 (29...gf2?! 30.Kf1=+) 30.Ne4 gh2 31.Kh1 Nf2 32.Rf2 Rf2 33.Nf2 Be3–+; B) 28.ef4 Qf4 29.Qf4 Rf4 30.Nec6=+ (worse 30.Nd3 ed3 31.Nb3 Ra4–/+)) 28.Nd3 ed3 29.Rd3 f4 (29...Qc4!? 30.Rd1 Qa4=) 30.Qf3 (30.Qg4 fe3 31.fe3 Kh8+–) 30...Qc4 (30...Qa2 31.Qe2 (31.ef4?? Rf4 32.Qe2 Qe2 33.Ne2 Rf2–+) 31...Qa4 32.Ne6=) 31.Qd1+– fe3 32.fe3 Bd4 33.Rd4 Qc3 34.Rd3 Qb4 35.Rd8 Qe7 (better 35...Rd8 36.Qd8 Kf7 37.Qc7 Kg8+–) 36.Rd3?? (better 36.Qd5!? Kh8 37.Rf8 Qf8 38.Qe6+–) 36...Qf6 (36...Qb4 37.Qb3 Qb3 38.Rb3 Re8+–) 37.h3 Qf2 38.Kh1 h6 (38...Qf6+–) 39.Qd2 (39.Rd8 Kh7 40.Rf8 Qf8 41.Qd3 Kg8 42.Qd5 Kh7 43.Qe4 Kh8+–) 39...Qf1 (39...Qd2!? 40.Rd2 Re8+–) 40.Kh2 Kh8 (40...Qf6 41.Rd6 Qe5 42.Kg1+–) 41.Rd8 (41.Rd6 Qc4+–) 41...Qf6 42.Rf8 Qf8 43.Qd4 Qf6? (better 43...Qb8 44.g3 Qc7+–) 44.Qf6 gf6 45.Kg3 Kg7 46.Kf4 Kf7 47.Kf5 Ke7 48.Kg6 Ke6 49.Kh6 Kd5 50.Kg6 Kc4 51.Kf6 Kb4 52.e4 Ka4 53.e5 Kb4 54.e6 a4 55.e7 a3 56.e8Q a2 57.Qa8 Kb3 58.Qa2 (58.Qa2 Ka2 59.Ke6+–) 1–0. RichardSommer (2060) – alkhawaja111 (2175), lichess.org, 2020.

5.e3 d4 6.Nf3 (6.ed4 cd4 7.Nf3 Bg4+–) 6...Bg4 (6...de3 7.fe3 Nbd7 8.Bd3+=) 7.h3 Bh5 (7...Bf3 8.Qf3 (worse 8.gf3 g6=) 8...de3 9.de3+=) 8.Be2 (8.ed4 cd4 9.g4 Bg6 10.Bd4 e6+–) 8...e6 (8...de3 9.fe3 e6 10.0–0+=) 9.Nd4 cd4 (9...Be2 10.Ne2 Nbd7 11.0–0+–) 10.Bh5 de3 11.fe3 Bd6 12.0–0 Qb6? (better 12...Nbd7+–) 13.Bf6+– gf6 14.Rf6 Nd7 15.Rf7 0–0–0 16.d4 e5 (16...Ne5 17.Rf1 Rhf8+–) 17.c4 (better 17.Nc3 ed4 18.Nd5+– (18.Qd4?! Be5 19.Qb6 Nb6+–)) 17...ed4 18.ed4 (18.Qd4 Bc5 19.Qg4 Rhg8+–) 18...Be5+– 19.c5 Nc5 20.Qg4 (20.de5? Nb3 21.Kf1 Rd1 22.Bd1 Na1–+) 20...Ne6 21.Kh1 Rd4 22.Nc3?? (better 22.Qe2 Rd5 23.Ra2+–) 22...Rg4–+ 23.Bg4 Bc3 24.Rc1 Kb8 (better 24...Qe3!? 25.Be6 Kb8 26.Rff1–+) 25.Rc3 h5 (25...Nc5 26.Rc4–+) 26.Be6 (26.Bf3 Nc5 27.Re3 Qd8–+) 26...Qe6 27.Rcc7 Qe1 28.Kh2 Qe5 29.g3 Qc7 30.Rc7 Kc7 31.Kg2 Kd6 32.g4 hg4 33.hg4 Rc8 34.Kg3 (34.b6 Rc4 35.g5 Ra4–+) 34...Rc4 35.Kh4 (35.g5–+) 35...Ra4 36.Kh5 Rb4 (36...Ra1 37.Kh4 a4 38.Kg3 a3 39.Kf3 a2 40.Ke3 Rh1 41.Ke2 a1Q 42.g5 Qf1 43.Kd2 Qf3 44.b6 Rh2 45.Ke1 Qe2) 37.g5 Rb5 38.Kh6 Rg5! 39.Kg5 (39.Kg5 a4 Passed pawn) 39...a4 40.Kf4 a3 41.Ke3 a2 42.Kd2 a1Q 43.Kc2 b5 44.Kb3 (44.Kd2 Qd4 45.Kc2 b4 46.Kb3 Qc3 47.Ka2 b3 48.Ka3 b2 49.Ka2 Qc1 50.Kb3 b1Q 51.Ka4 Qc4 52.Ka5 Qbb4) 44...Qa4 (44...Qd4 45.Kc2 b4 46.Kc1 b3 47.Kb1 Qd2 48.Ka1 Qc1) 45.Kc3 (45.Kb2 Qc4 46.Ka3 Qc2 47.Kb4 Qb2 48.Ka5 Kc6 49.Ka6 Qa3) 45...Qc4 46.Kd2 (46.Kb2 b4 47.Ka1 Qe2 48.Kb1 b3 49.Kc1 Qc2) 46...b4 47.Ke3 (47.Ke1 b3 48.Kd2 b2 49.Ke3 b1Q 50.Kf2 Qbf1 51.Ke3 Qfe2) 47...b3 48.Kf3 (48.Kd2 b2 49.Ke3 b1Q 50.Kf2 Qbf1 51.Ke3 Qfe2) 48...b2 49.Kg3 (49.Ke3 b1Q 50.Kf2 Qbf1 51.Ke3 Qfe2) 49...b1Q 50.Kf3 (50.Kf2 Qbf1 51.Ke3 Qfe2) 50...Qbb3 (50...Qbf1 51.Ke3 Qfe2) 51.Kf2 Qcc2 52.Ke1 Qbb1 0–1. Abdullaevich (1840) – newbeginner2019 (1945), lichess.org, 2019.

5.Nf3 Bg4 6.e3 e6 7.g3 Nbd7 8.Bg2 Nb6 9.0–0 Be7 10.d3 0–0 11.Nbd2 Nfd7 12.Qb1 Bf6 13.c3 Qc7 14.d4 Rfd8 15.Ba3 (15.e4 Rac8=+) 15...Bf5 (15...Na4 16.Rc1–/+) 16.Qb3 e5 17.Rac1 e4 18.Ne1 c4 19.Qd1 Nf8 20.Qh5 (20.Bc5 Re8=) 20...Bg6 21.Qd1 Ne6 22.Ra1 Ng5 (better 22...Re8!?=+) 23.h4+= Ne6 24.Bb2 (better 24.h5 Bh5 25.Qh5 Na4 26.Be4 de4 27.Ne4+–) 24...h6=+ 25.Bh3 Bh7 26.f3? (26.Ng2 Re8=+) 26...g5?? (better 26...Qg3!? 27.Bg2 Bh4–+) 27.h5? (27.fe4 Qg3 28.Bg2 Bg7=) 27...Ng7 (27...Qg3 28.Bg2 g4 29.fe4 Qe3 30.Kh2–+) 28.Kg2 (28.fe4!? Qg3 29.Bg2=+) 28...Nh5–/+ 29.f4 Ng3 (better 29...Ng7–/+) 30.Kg3+= Kh8 31.Ng2 Rg8 32.Kf2 gf4 33.Nf4 Bh4 34.Ke2 Rg3 35.Rh1 1–0. alessandrocarvalhaes (1740) – lichessi (1730), lichess.org, 2019.

5.Bf6 ef6 6.e3 Bf5 7.Nf3 Bd6 8.c4 dc4 9.Bc4 0–0 10.Qb3 Nd7 11.Nh4 Bg6 (11...Bb1 12.Rb1 Nb6 13.Nf5=) 12.Ng6+= hg6 13.Qd3 (13.Nc3 Nb6+=) 13...Qe7 (13...Ne5 14.Qc2=) 14.Qg6+= Ne5 (14...Nb6 15.Qc2+=) 15.Qc2+– b6 (15...Rfd8 16.Bd5+=) 16.d3 (16.Na3 Rfd8+–) 16...Rfd8 (16...Nc4 17.dc4 Be5+–) 17.Bd5 (17.Nd2!?+–) 17...Rac8+= 18.Qb3 (18.Kf1!?+=) 18...Ng4 19.h3 Ne3 20.fe3 Qe3 21.Kd1 Bf4 (better 21...c4 22.Bc4 Bf4–/+) 22.Re1+= c4 23.Qc3 (23.Bc4 Qc1) 23...Qd3? (better 23...Qc5!? 24.Bc4 Qc4 25.Re8 Re8 26.dc4 Rcd8 27.Nd2 Re3=) 24.Qd3+– cd3 Do you see the mate threat? 25.Bc6 Rd4 26.Nd2 Rcd8 27.Re8 Re8 28.Be8 Rb4 (better 28...f5+–) 29.Ra2?? (29.Ra3 Rd4+–) 29...Kf8?? (better 29...Bd2 30.Kd2 Re4 31.Bf7 Kf7 32.Kd3 f5=+) 30.Bd7 Rd4 31.Bc6 f5 32.Bf3 (32.Ra3 Ke7+–) 32...Ke7 33.Ke1 (33.Ra3 Kf6+–) 33...g5 (33...Bg3 34.Kf1+=) 34.Bd1 (34.Ra3!?+–) 34...Bg3+= 35.Kf1 g4 36.hg4 (36.Bb3 Rf4 37.Kg1 Bf2 38.Kh1 Be1=) 36...fg4= 37.Kg1 Be1 38.Kf1 Bh4 39.Kg1 f5 40.Nf1 Be1 41.Nd2 Rf4 42.Nf1? (better 42.Rb2=) 42...g3–+ The mate threat is Bc3 43.Ng3 (better 43.Bf3 Ke6 44.Ne3–+) 43...Bg3 44.Rd2 (44.Bf3–+) 44…Re4 (44...Re4 45.Rf2 Bf2 46.Kf2 d2–+) 0–1. petrobbo (1975) – OldButGood (2320), ChessWorld.net, 2011.

4.c4 dc4

5.Na3 Nf6 6.Nc4 Bg4 7.Nf3 e6 8.Nce5 Bh5 9.g3 Be7 10.Bg2 a4 11.0–0 0–0 12.Qc2 Nbd7 13.Rfe1 a3 14.Nd7 ab2 15.Nf8 ba1Q 16.Ra1 Bf8 17.a4 Nd5 18.Rc1 Qf6 19.Qa2 Bd6 20.Re1 Ra5 21.Qc2 Bf3 22.Bf3 Qd4 23.Be4 g6 24.Bd5 ed5 25.e4 Ra4 26.ed5 Rb4 27.Rb1 Qd5 28.b6 Be5 29.Rb4 cb4 30.h4 b3 31.Qc8 Kg7 32.Qc1 b2 33.Qe1 Bd4 0–1. Lindberg,Rune – Nyaradi,Tibor, MCO 2/17, 1999.

5.e3 Be6 6.Nc3 Qb6 (6...Nd7 7.Nf3=) 7.Qa4 Nd7 Black gets deadly initiative 8.Bc4 Bc4 9.Qc4 e6 10.a4 (10.Nf3 Ngf6=) 10...Ngf6 (better 10...Ne5 11.Qe4 Bd6=) 11.Nge2 (better 11.Nf3=) 11...Ne5–/+ 12.Qa2 (12.Qb3 Nd3 13.Kf1 Rd8–/+) 12...Nd3 13.Kd1?? (better 13.Kf1–/+) 13…Nf2–+ (13...Nf2 14.Kc2 Nh1 15.Rh1 Rd8–+) 0–1. aravind555 (1655) – HachimanX (1685), lichess.org, 2019.

4.c4 d4

5.d3 Nf6 6.Nf3 Nbd7 7.g3 e5 8.Bg2 Rb8 (8...Bd6 9.0–0=+) 9.Nbd2 b6 (9...Bd6 10.0–0=) 10.0–0 Bb7 11.e3 Bd6 12.Ng5 0–0 13.Bb7 Rb7 14.Qf3 Qb8 (14...Ra7 15.Rae1=) 15.Rae1 h6 16.Nge4 Ne4 (16...Ra7 17.Qf5=) 17.Ne4 (worse 17.de4 Nf6=+) 17...Be7 18.Qf5 g6 19.Qh3 f5 20.Qh6 fe4 21.Qg6 Kh8 22.ed4 Rf6? (better 22...cd4 23.Re4 Bf6+–) 23.Qh5+– Kg8 (23...Kg7 24.de5 Rg6 25.Re4 Qe8+–) 24.de5 Re6 25.Qg4 Kf7 26.Qf5 Bf6 27.ef6 Nf6 (27...Qd6 28.Re4 Nf6 29.Bf6 Rf6 30.Qh7 Kf8 31.Qb7+–) 28.Re4 Rbe7 (28...Re4 29.de4 Qd8+–) 29.Bf6 Rf6 30.Qh7 (30.Qh7 Kf8 31.Re7 Qg3 32.hg3 Rf2 33.Rf2) 1–0. Janek – Tempoh, internet, 2017.

5.e3 e5 6.ed4 ed4=+ 7.d3 (7.Bd3 Nf6=+) 7...Bd6 8.Nf3 Bg4 (8...Nf6 9.Be2=+) 9.Be2 f5 (9...Bf5 10.Nbd2=+) 10.h3 (better 10.0–0+=) 10...Bh5? (10...Bf3 11.Bf3 Qe7 12.Qe2=) 11.Nbd2?? (11.Nd4 cd4 12.Bh5 g6+–) 11...Nd7? (11...Bg6 12.a3=) 12.0–0?? (better 12.Nd4!? cd4 13.Bh5 g6 14.Bd4 Qe7 15.Qe2+–) 12...Ngf6 (12...Qf6 13.Re1 Ne7 14.Ne5 Ne5 15.Bh5 g6 16.Be2=) 13.Ng5 (13.Nd4 Bg6 14.N4f3 a4+–) 13...Be2 (13...Bf7 14.Nf7 Kf7 15.Re1=) 14.Qe2+– Qe7 15.Ne6 Kf7 16.Ng5 (16.Rae1 Rhe8 17.Qd1 Bh2 18.Kh2 Qd6 19.Kg1 Re6 20.Re6 Qe6+=) 16...Kg6 17.Qe7 Be7 18.Rfe1 Rhe8 19.Ne6 Rac8 (19...Bd6 20.Nf3 Nh5 21.Ba3=) 20.Nf3 Bd6 (20...Kf7 21.Re2=) 21.h4 (better 21.Nh4 Kf7 22.Ng7 Re1 23.Re1+–) 21...h6 22.g3 (22.Ba3!?=+) 22...Kf7–/+ 23.Nf4 Bf4 24.gf4 Nh5 25.Ne5 (25.Re8 Re8 (worse 25...Ke8 26.Re1 Kf8 27.Ba3=+) 26.Bc1 a4–/+) 25...Ne5–+ 26.fe5 Re6 (26...Nf4 27.Rad1–+) 27.Bc1–/+ Rce8 28.f4 (better 28.Bd2–/+) 28...g5 (better 28...Rg6!? 29.Kf2 Rg4–+) 29.hg5 (29.fg5!? hg5 30.Bg5 Re5 31.Re5 Re5 32.Kg2=) 29...hg5=+ 30.Rf1? (30.fg5 Re5 31.Re5 Re5=+) 30...g4 (better 30...gf4 31.Kf2 Re5–+) 31.Kg2=+ Rh6 32.Bd2 b6 (32...Reh8 33.Rh1=+ (33.Ba5? Nf4 34.Rf4 Rh2 35.Kg1 Rh1 36.Kg2 R8h2 37.Kg3 Rh3 38.Kg2 Ra1 39.Rf5 Ke6–+)) 33.Rae1 Ke6 34.Rd1 (34.Rg1 Rg8=+) 34...Reh8 (better 34...Re7=+) 35.Be1? (better 35.Rh1=+) 35...Nf4–+ 36.Rf4 Rh2 37.Kf1 R8h3 (37...Ra2 38.Rf2 Rh1 39.Kg2 Rf2 40.Kh1 Rf3–/+) 38.Bf2?? (better 38.Rf2 Rh1 39.Ke2 Re3 40.Kd2–/+) 38...Ke5–+ (38...Ke5 39.Rd4 Rh1 40.Bg1 cd4–+) 0–1. GuestHCCV – GuestWXWH, freechess.org, 2018.

5.Nf3 Qc7 6.e3 e5 7.Bd3 Nf6 8.ed4 (8.Ng5 Bd6=) 8...ed4 (8...e4 9.Be4 Ne4 10.Qe2=+) 9.a4 (9.Qe2 Be7=+) 9...Bd6=+ 10.Qe2 Qe7 11.Na3 (11.Qe7 Be7 12.0–0 0–0=) 11...Qe2 12.Be2 Nbd7 13.d3 (13.0–0 Nb6 14.Rfe1 0–0=+) 13...b6 (13...Nb6 14.Nb1=+) 14.0–0–0 (14.Nh4 Be5=+) 14...Bb7 15.h3 0–0–0 16.Rhg1 Rde8 17.Rde1 Re7 18.Bd1 Rhe8 19.Re7 Re7 20.Re1 Ne5 21.Kc2 Nf3 22.Re7 Be7 23.Bf3 Bf3 24.gf3 Bd6 25.Bc1 Nh5 26.Nb1 Nf4 27.Bf4 Bf4 28.Nd2 Bd2–+ 29.Kd2 Kd7 30.f4 Ke6 31.Ke2 Kf5 32.Kf3 f6 33.h4 h5 34.Kg3 g5 35.fg5 fg5 36.hg5 Kg5 37.Kh3 Kf4 38.Kh4 Kf3 39.Kh5 Kf2 40.Kg4 Ke3 41.Kf5 Kd3 42.Ke5 Kc4 43.Kd6 d3 44.Kc6 d2 45.Kb6 d1Q 46.Ka5 Qd8 47.Ka6 Qa8 (48.Kb6 Qa4–+; 47...Qb8 48.a5 Kb4 49.b6 Qa8#) 0–1. Luneau,Gilles – Giering,Helmut, Wch Seniors Bad Liebenzell, 1996.

5.Nf3 Qc7 6.e3 e5 7.ed4 cd4 8.Qe2 +/–.

5.Nf3 Qc7 6.e3 e5 7.ed4 ed4 8.Bd3 Nf6 9.0–0 Bd6 (9...Be7 10.Re1 0–0 11.Na3=) 10.Re1 (10.Qe2 Kf8+=) 10...Be6= 11.Bf5 0–0 12.Be6 fe6 13.Re6 Nbd7 14.g3 (14.d3 Ne5 15.g3 Rfe8 16.Re8 Re8 17.Ne5 Be5+=) 14...Rae8 (14...Nb6 15.d3=) 15.Re8+= Re8 16.d3 Ne5 17.Ne5 Re5 18.Nd2 Re8 19.Nf3 Qd7 (19...Qe7 20.Ba3+=) 20.Kg2 h6 (20...b6 21.Qd2+/–) 21.Qf1+/– Nh5 22.Re1 Nf4 (22...Re1 23.Ne1 (23.Qe1?! Nf4 24.gf4 Qg4 25.Kf1 Qf3 26.Qe6 Kh7 27.Qd6 Qd1 28.Kg2 Qg4 29.Kf1 Qd1 30.Kg2 Qg4 31.Kf1 Qd1=) 23...Qe6 24.Bc1+/–) 23.Kh1 Re1 24.Ne1 Nh5 25.f4 g5 (25...Nf6 26.Kg1+/–) 26.Qf3 Qe6 27.Nc2 (27.Qh5?! Qe1 28.Kg2 Qd2 29.Kh3 Qd3 30.fg5 hg5 31.Qg5 Kf7 32.Qd5 Ke7 33.Qb7 Ke8 34.Qc6 Ke7=) 27...Qh3 (27...g4 28.f5 gf3 29.fe6+/–) 28.Nd4! cd4 29.Qd5 Kh7 30.Kg1 Qg4 31.Qb7 (worse is 31.Qd6 Qd1 32.Kg2 Qe2 33.Kg1 Qb2+=) 31...Kg6 32.Qe4 Kf7 33.Bd4 (33.fg5 Qe4 34.de4 d3+–) 33...Nf6 34.Bf6 Kf6 35.fg5 Qg5 36.Qf3 Ke7 (36...Kg7 37.Qf2+/–) 37.Kf2 (37.Qe2 Kd7+/–) 37...Kd8 38.Qa8 (38.Kf1 Qd2 39.Qd5 Kd7 40.Qc6 Ke7 41.Qe4 Kd8+=) 38...Kd7 39.Qb7 (worse is 39.Qa5 Qf5 40.Ke2 Qh5 41.Ke1 Qh2 42.Qa7 Ke6 43.Qe3 Kd7=) 39...Ke8 40.Qe4 Kd7 41.Kf3 Qf6 42.Kg4 Qg5 (42...h5 43.Kh5 Qh8 44.Kg6 Qh2 45.Qf5 Kc7 46.c5 Qg3 47.Kf7+/–) 43.Kh3+/– Qf6 44.Qc6 (44.Qe2 Kc7+/–) 44...Ke7 45.Qb7 Ke8 46.Qa8 Kd7 47.Qa7 (47.Qe4 a4+=) 47...Bc7+= 48.Kg2 Qc3 49.Qe3 Kc8 (49...Bd6 50.Qf3+/–) 50.Qf3 (worse is 50.Qh6 Qc2 51.Kh3 Qd3 52.Qe6 Kb8+=) 50...Kb8 51.Qf8 Kb7 52.Qf5 a4 53.Kh3 Bb6 (53...Qb2 54.Qe4 Kb8 55.Qe8 Kb7 56.Qc6 Kb8 57.Qh6+/–) 54.Qe4 Kb8 55.Qe8 Ka7 56.Qd7 ½–½. cachisss (1950) – housemd (2050), gameknot.com, 2015.

5.Nf3 Nd7 6.e3 e5 7.ed4 ed4 8.Be2 (8.Bd3 Qe7 9.Qe2 Ngf6=+) 8...Bd6=+ 9.0–0 Ngf6 10.Re1 0–0 11.Qc2 b6 12.d3 Bb7 13.Nbd2 Qc7 14.g3 Rae8 15.Bf1 Qb8 16.Bh3 Re1 17.Re1 Re8 18.Ne4 Kf8 (18...Ne4 19.de4 Qc7 20.Qd3=+) 19.Re2 Ne5 20.Ne5 Be5 21.Bf5 g6 22.Qd2 Kg7 23.Bc1 Ng8 24.Bd7 Re7 25.Bc6 Bc8 (25...Bc6!? 26.bc6 Qc7=+) 26.Kg2 (26.Bd5 Bg4 27.Re1 f5+=) 26...f5 27.Ng5 Bf6 28.Qd1 Qd6 29.Bd5 Bb7 (29...Re2 30.Qe2 Qe5 31.Qe5 Be5 32.Ne6 Be6 33.Be6=) 30.Bb7+– Rb7 31.Bf4 Qd8?? (better 31...Qd7+–) 32.Ne6+– Kf7 33.Nd8 Bd8 34.Re1 Bf6 (34...Re7 35.Re7 Ne7 36.Qf3+–) 35.Qf3 Rd7 36.Qc6 Re7 37.Re7 Ne7 38.Qb6 g5 39.Bd6 (39.Bd6 f4 40.Qc5 f3 41.Kf3 g4 42.Kg4+–) 1–0. Janek – mi1320, internet, 2018.

4.bc6 bc6

5.e3 Nd7 6.Nf3 Rb8 7.Ba3 Ngf6 8.Nc3 e5 9.Bf8 Rf8 10.Rb1 Rb1 11.Qb1 Qc7 12.Be2 Nc5 13.0–0 e4 14.Nd4 Ng4 15.Bg4 Bg4 16.h3 Bc8 17.Qb2 Ne6 18.Nf5 g6 19.Ng3 f5 20.Rb1 f4 21.ef4 Qf4 22.Qb6 Kd7 23.Nf1 Qc7 24.Na4 Qb6 25.Nb6 Kc7 26.Nc8 Rc8 27.Ne3 Rf8 28.c4 d4 29.Nf1 Nc5 30.Ng3 d3 31.Nf1 h5 32.Ne3 h4 33.g3 Rf3 34.Kg2 g5 0–1. Knorr – Vettenburg, corr SOK–97–125 1997–99.

5.Nf3 Nd7 6.e3 a4 (6...Rb8 7.Qc1=) 7.c4 e6 8.Qc1 (8.cd5 ed5 9.Qc2 a3=) 8...Ba6 9.Nc3 Bc4 (9...Nb6 10.Ne5=) 10.Bc4 a3 11.Bb3 ab2 12.Qb2 Ba3 (12...Ngf6 13.0–0=) 13.Qc2= Ngf6 14.Ba4 Ra6 15.Nd4 (15.0–0!?=) 15...Qa8+= 16.0–0 0–0 17.Rfb1 Rc8 18.Qd1 Nb6 19.Bb3 Nfd7 20.Nf3 Ra5 21.Bc2 Nc4 22.d4 h6 23.Rb3 Bb2 24.Rb1 Bc3 25.Rc3 Ra2 26.Bb3 Ra3–/+ 27.Qd3 Nd6 28.Nd2 c5 29.dc5 Nc5 30.Qc2 Nb3 31.Rc8 Qc8 32.Qc8 Nc8 33.Nb3 g6 34.h3 Kg7 35.Nd4 Kf6 36.Rb2 Nd6 37.Kh2 Ra1 38.Rc2 Ne4 39.g3 g5 40.Kg2 h5 41.Kf3 Rf1 42.Kg2 Rd1 43.Kf3 Rf1 44.Kg2 Re1 45.Kf3 g4! 46.Kg2 Kg6 47.hg4 hg4 48.Rb2 Ng5 49.Rb6 Rd1 50.Ra6 Rd2 51.Rc6 Nh3 52.Rc2 Rd1 53.Nc6 f6 54.f3 Kh5 55.f4 Rg1 56.Kh2 Re1 57.Nd4 Re3 58.Rc8 Re4 59.Nc6 Re2 60.Kh1 Kg6 61.Re8 Kf7 62.Rd8 Re1 63.Kg2 Rg1 64.Kh2 Rc1 65.Rd7 Kf8 66.Rd8 Kg7 67.Rd7 Kh6 68.Ne7 Rc2 69.Kh1 Nf2 70.Kg1 Ne4 71.Ng8 Kg6 72.Ne7 Kh5 73.Rd8 Kh6 74.f5 Ng3 75.fe6–/+ Ne2 76.Kf1 Nd4 77.Rd5 Ne6 78.Rd6 Rc1 79.Kf2 Ng5 80.Rf6 Kh5 81.Rf8 Ne4 82.Kg2 Rc2–+ 83.Kg1 Kg5 84.Kf1 Rd2 85.Kg1 Rd7 86.Rf5 Kh4 87.Ng6 Kg3 88.Ne5?? Rd5 89.Kf1 Nd2 90.Ke2 Nc4!! (90...Nc4 91.Nc4 Rf5–+) 0–1. Gimeno Higueras,Roberto (2140) – Larino Nieto,David (2370), ESP–ch U18, 2006.

5.Nf3 Nf6 6.e3 Qc7 7.Be2 Bg4 8.0–0 Nbd7 9.d4 g6 (9...Rb8 10.Bc3=) 10.Nbd2 Bg7 11.c4 e6 12.c5 (12.Ba3!?+=) 12...0–0= 13.Qa4 Rfe8 (13...Ne4 14.Qc2 Rfb8 15.Ne4 de4 16.Ng5 Be2 17.Qe2 Nc5 18.Ba3=) 14.Rab1 Re7 15.Rfe1 Ne8 16.Nb3 e5 17.de5 Bf3 18.Bf3 Ne5 19.Be2 f5 20.Nd4 Nf6 21.f4 Neg4 22.Bg4 Ng4 23.Nc6 (23.Qc6 Qc6 24.Nc6+–) 23...Re3?? (better 23...Re4 24.Qb5 Bb2 25.Rb2 Ne3=) 24.Bg7+– Kg7 (better 24...Qg7 25.Re3 Ne3+–) 25.Ne5?? (better 25.Qd4 Kh6 26.Re3 Ne3 27.Rb3+– (27.Qe3?! Qc6 28.Qd4 Qe6+=)) 25...Re1 26.Re1 Ne5 (26...Qc5 27.Qd4 Qd4 28.Kh1 Nf2 29.Kg1 Nh3 30.Kh1 Qg1 31.Rg1 Nf2) 27.fe5 (27.Qd4 Rc8 28.Rc1= (worse 28.Re5 Qc5 29.Rd5 Qd4 30.Rd4 Rc1 31.Kf2 Rc2 32.Kf3 Ra2–/+; 28.fe5 Qc5 29.Qc5 Rc5–/+)) 27...Re8?? (27...Qc5 28.Kh1 Qc3 29.Qh4=+) 28.e6 (28.Qe8 Qc5 29.Kh1+–) 28...Re7?? (better 28...Qc5!? 29.Kh1 Qb4–/+) 29.c6?? (better 29.Qd4 Kg8 30.Qd5+–) 29...Qd6 (29...Qb6 30.Kf1=) 30.Qa5 (30.Qd4 Kg8 31.Qf6 d4=) 30...Re6 (30...Qc6 31.Rd1 Qe6 32.Qc3 Qe5 33.Qc5–/+) 31.Rc1 (31.Re6 Qe6 32.Qc3 Kf7+–) 31...Re8 (31...Qf4!? 32.Qc5 d4=) 32.c7 Rc8 33.Qa7 d4 34.Qb7 (34.Qc5!? Qf4 35.Qe7 Kh6 36.Rc4+–) 34...Qd7 (34...Qf4 35.Qc6= (worse 35.Qc8 Qc1 36.Kf2 Qe3 37.Kf1 d3 38.Qd7 Kh6–/+)) 35.Qb8 1–0. alessandrocarvalhaes (1945) – beyefendi (2045), lichess.org, 2020.

4.bc6 Nc6

5.e3 e5 6.Nf3 Bd6 7.Nc3 Nge7 8.Nb5 0–0 9.Nd6 Qd6 10.h3 Bf5 11.c4 d4 12.Nh4 de3 13.de3 Qb4 14.Qd2 Rfd8 15.Qc3 Bd3 16.0–0–0 Qc3 (better is 16...Be4!?–/+) 17.Bc3= Bf1 18.Rhf1 f6 19.Rd8 Rd8 20.Kc2 Kf7 21.Rb1 Rd7 22.a4 Nc8 23.Nf3 b6 24.Nd2 Ke7 25.c5 bc5 26.Rb5 Nb4 (26...Rd5!? 27.Nc4 e4=) 27.Bb4+= cb4 28.Ra5 Nb6 29.Rb5 (29.Ne4!?+=) 29...Na4= 30.Rb4 Nc5 31.f3 Nd3 32.Rb1 h5 33.Ne4 h4 34.Nc3 g5 35.Rd1 Nb4 36.Kb3 Rd1 37.Nd1 Nc6 38.Nf2 f5 39.Kc3 Ke6 40.Kd3 Nb4 41.Kc3 Nd5 Black plans f4 42.Kd2 f4 43.Ng4 fe3 44.Ne3 Nf4 45.Ke1 e4 46.fe4 Ke5 47.Kf1 Ke4 48.Nd1 Nd5 49.Kf2 Kf4 50.Kg1 Kg3 51.Nf2 Ne3 52.Ne4 Kf4 53.Nf2 Nd5 54.Kf1 Nc3 55.Kg1 Kg3 56.Nh1 Kf4 57.Nf2 Ke3 58.Ng4 Ke2 59.Nf2 Nd5 60.Ne4 g4 61.hg4 Ke3 62.g3 ½–½. purplegadge (1790) – nacho_day (1865), gameknot.com, 2014.

5.e4 d4 (5...de4 6.Bb5–/+) 6.Nf3 e5 7.Bb5 Bg4 8.h3 Bf3 9.Qf3 Nf6 10.d3 (10.0–0 Rc8=) 10...a4 11.a3?? (better 11.0–0=) 11...Qa5–+ 12.Nd2 (12.Nc3 dc3 13.Bc6 bc6–+) 12...Qb5 13.Bc1 (13.Rb1 Qa5–+) 13...Qa5 14.0–0 Be7 15.Nc4 Qc7 (15...Qc5 16.Bg5–+) 16.Bg5 (16.Rb1 Na5 17.Nb6 Ra6–+ (17...Qc2?! 18.Rb2 Qc5 19.Na8–+)) 16...b5 17.Bf6 gf6 (17...Bf6 18.Nd2–+) 18.Nd2 Rg8 19.Qh5 0–0–0 (19...Rg7!? 20.Qh6 Kf8 21.Nf3–+) 20.Qh7 (20.Qf7 Qd7 21.Kh1 Rdf8 22.Qh7 Rh8–+) 20...Bc5 (20...Rdf8 21.Rfb1 Na7 22.Ra2–+) 21.Qf5 Kb7 (21...Qd7 22.Rfb1 Qf5 23.ef5–+) 22.Rab1 (22.Rfb1 Na7 23.Qf6–+) 22...Ka6 23.c4?? (23.Qf6 Rd6 24.Qh4–+) 23...b4 (better 23...dc3 24.Nf3 Ba3 25.Qf6 c2–+) 24.ab4–/+ Nb4 (24...Bb4 25.Nf3–/+) 25.Ra1 Qa5 (25...Qc6 26.Qf3 Kb7–+) 26.Qf6 Rd6? (26...Bd6 27.Rfb1 Rg6 28.Qf7 Rdg8+–) 27.Qf7+– Rdg6 28.g3 (better 28.Nb3! ab3 29.Ra5 Ka5 30.Qc7 Bb6 31.Qe5 Ka4 32.Ra1 Na2 33.Qb5 Ka3 34.Rb1 Rg2 35.Kh1+–) 28...Nd3+– 29.Nf3?? (better 29.Rfb1 Bb4 30.Nb3 ab3 31.Ra5 Ba5 32.Rb3+–) 29...Rg3?? (better 29...a3 30.Rfb1 Bb4=+) 30.fg3+– Rg3 (30...Rd8 31.Rfb1 Bb4 32.c5 Nc5 33.Ne5+–) 31.Kh2 (31.Kh2 Rf3 32.Qe6 Kb7 33.Rf3 Qd2 34.Kh1 Nf2 35.Rf2 Qc1 36.Rc1 Bb6 37.Rf7 Bc7 38.Rb1 Ka7 39.Rc7 Ka8 40.Qc6) 1–0. alessandrocarvalhaes (1865) – NELBOX65 (1830), lichess.org, 2020.

4.e3 b6

5.a4 Nd7 6.Nf3 Qc7 7.c4 Ngf6 (7...e6 8.d4 Ngf6 9.cd5 ed5 10.dc5 bc5 11.Be2=) 8.cd5+= Bb7 9.Nc3 Nd5 10.Nd5 Bd5 11.Qc2 e6 12.Bc4 Qb7 (12...Bb7 13.0–0+=) 13.Bd5+– Qd5 14.0–0 Nf6 15.Ne5 Bd6 16.Nc4 Bc7 17.f4 Rd8 (17...0–0–0 18.Ra3+–) 18.Be5 (18.d4 Rd7+–) 18...Qb7 (18...Be5 19.fe5 (worse 19.Ne5 Qe4 20.Qd1 0–0+=) 19...Ng4 20.Rad1 (worse 20.Nb6 Qe5 21.g3 Qh5=+) 20...Ne5 21.Nb6+–) 19.Rf3 Rd7 (19...h5!? 20.d4 cd4 21.ed4+–) 20.Rg3+– Nh5 21.Rg5 f6 (21...Be5 22.fe5 (22.Re5?! g6+=) 22...g6 23.Nd6 Rd6 24.ed6+–) 22.Rh5 fe5 23.Rh7 Rf8 (23...Rh7 24.Qh7 ef4 25.Qg8 Ke7 26.Qg7 Ke8 27.Qh8 Ke7 28.Qh7 Kd8 29.Qg8 Ke7 30.Qg5 Kf7 31.Qh5 Ke7 32.Qh4 Ke8+–) 24.Qg6 (24.Qg6 Rdf7 25.Qe6 Kd8 26.Ne5 Be5 27.fe5+–; worse 24.fe5 Qd5 25.Qg6 Rdf7+–) 1–0. Pereira – Grandie, internet, 2019.

5.c4 d4 6.ed4 cd4 7.Nf3 d3 8.Ne5 Nd7?? (8...Bb7 9.Qh5 Nh6 10.Qh3+–) 9.Nd3 (better 9.Nf7 Kf7 10.Qh5 g6 11.Qd5 e6 12.Qa8+–) 9...Bb7+– 10.Nf4 (10.Ne5 e6+–) 10...Ngf6+= 11.Be2 (11.Nh5 e5+=) 11...e5 12.Nd5 (12.Nd3 Bd6=) 12...Nd5= 13.cd5 Bd5 14.0–0 Nf6 (14...Bc5 15.Nc3 Bb7 16.Bf3 Bf3 17.Qf3=) 15.Nc3 (15.Be5 Bd6 16.d4 Rc8+–) 15...Bb7 (better 15...Be6=) 16.d4 (better 16.Bf3 Bf3 17.Qf3+=) 16...ed4=+ 17.Bf3? (17.Na4 Bc5 18.Rc1=+) 17...Bf3?? (better 17...dc3 18.Re1 Be7 19.Qd8 Rd8–+) 18.Qf3= dc3 (better 18...Bc5 19.Rfe1 Kf8+=) 19.Qc6 Nd7 20.Rfe1 Be7 21.Ba3 0–0 22.Be7 Qc8 23.Bf8 Nf8 (23...Kf8 24.Rad1 Nc5 25.Qf3+–) 24.Qb6 (24.Rac1 Ne6+–) 24...Rb8 (24...Ne6 25.Rac1 Qc4 26.Qc6+–) 25.Qa5 c2 26.Rac1 Ne6 (26...Qc5 27.a4 Rc8 28.Qa6+–) 27.Qd2 (27.Qa4!? Qe8+–) 27...Rb5 28.Rc2 Rc5 (28...Qf8 29.a4 Rb8 30.a5+–) 29.Rec1 Rc2 30.Rc2 (30.Qc2 Qf8+–) 30...Qe8 31.Qc1 h6 (31...Nf8 32.Rc8 Qe7 33.h3+–) 32.Rd2 (better 32.Rc8 Nd8 33.Qd1+–) 32...Qe7 (32...Nf4 33.Qb1 Qa8 34.f3+–) 33.Qd1 Kh7 (33...Nf4 34.Rd8 Kh7 35.g3+–) 34.g3 (34.Rd7 Qf6+–) 34...Qf6 35.Qc2 (35.Qg4 Ng5 36.Kg2 Qc6 37.f3 Kg8+–) 35...g6 36.Qd1 (36.Rd6 Qe5 37.Qd2 Ng5+–) 36...Kg7 37.Re2 h5 (37...Nd4 38.Re4 Nf3 39.Kg2 Ng5+–) 38.Qe1?? (38.a4 Ng5+–) 38...h4? (better 38...Nd4 39.Re3 Nf3 40.Rf3 Qf3+–) 39.Re3 hg3 (39...Nd4 40.Qd1+–) 40.hg3 Ng5 (40...Qd4 41.Qc3+–) 41.Qc3 Nh3 (41...Qc3 42.Rc3 Ne4 43.Rc7+–) 42.Kg2 Ng5 43.f4 (43.a4 Ne6+–) 43...Ne4 (43...Qc3 44.Rc3 Ne4 45.Rc2+–) 44.Qe5 (44.Qf6 Nf6 (44...Kf6?? 45.Re4 Kg7 46.a4+–) 45.a4 Nd5+–) 44...Qe5 (44...Nd6 45.Rc3+–) 45.fe5 Ng5 (45...Nc5 46.Rc3 Na4 47.Rc7+–) 46.a4 Ne6 47.a5 (better 47.Rc3 Nd4+–) 47...Kh6 (47...Nc5+–) 48.a6 f5 (48...Nc7 49.a7 Kg7+–) 49.a7 f4 50.a8Q (better 50.Rc3 Kg5 51.a8Q Kf5+–) 50...fe3 51.Qh8 Kg5 52.Qf6 Kh5 53.Qe6 (53.Qh4) 53...g5 54.Qh3 (54.Qh3 Kg6 55.Kf3+–; 54.g4 Kh4 55.Kf3 e2 56.Qh6) 1–0. FeegLood (2795) – MeneerMandje (2665), lichess.org, 2017.

5.c4 d4 6.Nf3 de3 7.fe3 Nf6 8.Be2 Bb7 9.0–0 e6 10.a4 (10.Ng5 Be7+=) 10...Nbd7 11.d4 Be7 12.Nc3 0–0 13.d5 ed5 14.Nd5 (better 14.cd5!? Bd6 15.e4=) 14...Nd5–/+ 15.cd5 Bf6 16.Bf6 (16.Ra2 Bb2 17.Rb2 Nf6=+) 16...Nf6–/+ 17.Bc4 Bd5 18.Qd3 (18.Ne5 Re8 19.Ng4 Ng4 (19...Bc4?! 20.Nf6 gf6 21.Qg4 Kf8 22.Qc4=+) 20.Bd5 Qh4 21.Bf7 Kh8–/+) 18...Bc4 19.Qc4 Qd5 20.Qf4 Rae8 21.Rad1 Qe4 (21...Qb3 22.Rd6–+) 22.Qe4 (22.Rfe1!?–/+) 22...Re4 23.Rd6 Re6 (better 23...Rb8!?–+) 24.Re6–/+ fe6 25.Rd1 (25.Ne5 h6–/+) 25...Nd5 26.Kf2 Nc3 27.Rd6?? (27.Ra1 c4–/+) 27...Na4 (better 27...Ne4 28.Ke2 Nd6–+) 28.Re6 (better 28.Ke1–/+) 28...Nc3?? (better 28...Rf6 29.Re8 Kf7–+) 29.Rb6= a4 The passed pawn on b5 will quickly become a dangerous weapon 30.Ra6 Nb5 31.Ra4 Nd6 (31...Re8 32.Nd2=) 32.Ke2 (better 32.e4+=) 32...Ne4?? (better 32...Re8=) 33.Re4+– Rc8 34.Nd2 (34.Rc4 Kf7 35.Ng5 Kf6 36.Ne4 Ke6 37.Rc5 Rc5 38.Nc5 Kd5+–) 34...c4 (34...Kf7 35.Nc4 Kg6 36.Nd6+–) 35.Rc4 Rd8 36.Rd4 Ra8 37.Nf3 Ra2 38.Rd2 Ra5 39.Rd8 Kf7 40.Rd2 (40.Rd7 Kf6+–) 40...h6?? (40...Kg8 41.e4 Ra7+–) 41.Nd4 g5 42.g3 Kg6 43.Kf3 Kh5 44.Ne2 g4 45.Kg2 (45.Kf4 Rf5 46.Ke4 Ra5+–) 45...Rf5 (45...Kg5 46.Nf4+–) 46.Nf4 Kg5 47.Rd5 h5 (47...Rd5 48.Nd5 Kf5 49.h4+–) 48.Rf5 (48.e4 Rd5 49.ed5 Kf6+–) 48...Kf5 49.Kf2 h4 (49...Ke4 50.Nh5 Kf5 51.Nf6 Kf6 52.e4+–) 50.Ke2 (50.gh4 Ke5+–) 50...Ke4 (50...hg3 51.hg3 Kf6+–) 51.gh4 g3 (51...Kf5+–) 52.hg3 Kf5 53.Kf3 (53.Kf3 Kf6 54.g4+–) 1–0. BeepBeepImAJeep (2530) – Artak_Manukyan (2170), lichess.org, 2018.

5.c4 e6 6.a4 Bb7 7.Nf3 Nf6 8.Be2 Nbd7 9.0–0 Qc7 10.d4 (10.cd5 Bd5 11.d3 Bd6=) 10...Be7 (10...dc4 11.Bc4 cd4 12.Qd4 Bf3 13.gf3–/+) 11.Nbd2 Rc8 12.Rc1 0–0 13.h3 Rfd8 14.Qb3 (14.Bd3 Qb8=) 14...Bf8 (14...cd4 15.Nd4 e5 16.Nf5=+) 15.Qa2 h6 16.Qa1 Qd6 17.Rfd1 Qe7 18.cd5 Nd5 19.dc5 Nc5 (worse 19...bc5 20.Nc4 Ra8 21.Bc3+–) 20.Bc4 Rd7 21.Ne5 Rdc7 22.Ndf3 f6 23.Ng4 (23.Ng6 Qf7 24.Nf8 Qf8=) 23...h5 24.Ngh2 Qf7 25.Nf1 Rd7 26.Ng3 (26.N1d2 Qg6=) 26...Rcd8 (26...Bd6!? 27.Bd4 Bg3 28.fg3 Qg6=) 27.Nd4 Nb4 28.Nc6 (better 28.Ba3=) 28...Nc6–/+ 29.bc6 Bc6 30.Bb5? (better 30.Rd7 Bd7 31.Ba3–/+) 30...Bb5–+ 31.ab5 Nb3 32.Qb1 Nc1 33.Rc1 Rc7 (33...e5 34.Qa1–+) 34.Rf1 (34.Rc7 Qc7 35.Nh5 Rd2–+) 34...Rdc8 35.Ne2 (35.Bd4 Bc5–+) 35...Rc2 (better 35...e5!? 36.Ng3–+) 36.Nd4 R2c4 37.Nc6 R4c6 (37...e5!? 38.Rd1–+) 38.bc6 Rc6 39.Bd4 Bc5 (39...Bb4 40.Qd3–+) 40.Rc1 (better 40.Bc5 bc5 41.Rd1–/+) 40...Bd4?? (better 40...e5–+) 41.Rc6+= Bc5? (41...Qd7 42.Qe4 f5 43.Qf3–/+) 42.Qe4 (better 42.Rc8!? Bf8 43.Qb6+–) 42...e5 (42...f5!? 43.Qe5 Qf6 44.Qb8 Kh7+–) 43.Rc8 Bf8 44.Qa8 a4 (better 44...Qe7!?+–) 45.Qa4+– h4 46.Qh4 g5 (46...Qe6 47.Rb8 e4 48.Qh5+–) 47.Qc4 (better 47.Qb4!+–) 47...b5?? (better 47...Qc4 48.Rc4 Kf7+–) 48.Qb5 (48.Qb5 Kg7 49.Rd8+–) 1–0. BeepBeepImAJeep (2725) – feofan64 (2200), lichess.org, 2017.

5.Nf3 Bb7 6.a4 Nd7 7.Be2 f6 (7...Qc7 8.d3=) 8.c4 (8.Ng5 e5 9.Ne6 Qb8+=) 8...e6 (8...e5 9.cd5 e4 10.Nh4 Bd5 11.Qc2=) 9.0–0 Bd6 10.h3 (10.cd5 Bd5 11.Nc3 Bb7+=) 10...Ne7= 11.cd5 ed5 (11...Nd5 12.Na3=) 12.Nc3 0–0 13.d3 Ng6 14.Qd2 (14.Rc1 Qe7=) 14...Qe7 15.Rfe1 Nge5 (15...Rac8 16.d4 c4 17.Qc2=) 16.Rac1 Rac8 17.Ne5 (17.d4!? Nf3 18.Bf3+=) 17...fe5+= (worse is 17...Ne5 18.d4 Nc4 19.Bc4 dc4 20.d5=; worse is 17...Be5 18.d4 cd4 19.ed4+=) 18.Bf1 (18.Bg4 Qf7+=) 18...Qh4 19.Re2 Rce8 20.Rce1 Kh8 21.g3 Qh6 22.Bg2 Nf6 23.e4 d4 24.Qh6+= gh6 25.Nd1 Bc8 26.Bc1 h5 27.Nb2 Be6 28.Bh6 Rg8 29.Nc4 Bc7 30.h4 Rg6 31.Bg5 h6 32.Bf6 Rf6 33.Nd2 Ref8 34.f3 Rg8+= 35.Kh2 Rfg6 36.Nf1 Bd8 37.Bh3= Bb3 38.Ra1 Be7 39.Bf5 R6g7 40.Rb2 c4 41.dc4 Bc4= 42.Rg2 Bc5?? 43.Nd2= Bd3 44.Be6 Re8 45.Bd5 Rd8 46.Nb3+/– Bb4 47.Rc1 Re7? 48.Kh3 Kg7 49.Rc6 Rb8 50.Rg1 Be2 51.Kg2 d3+= 52.Rgc1 d2?? 53.Nd2+/– Bd2 54.R1c2 Bf3 55.Kf3 Bb4 56.Rc7 Rf8 57.Kg2 Bc5?? 58.Re7 Be7+/– 59.Rc7 Kf6? 60.Rc6+– Kg7 61.Rb6 Bc5 62.Rb7 Kh8 63.Rc7 Bd4 64.Rc6 Rf2 65.Kh3 Kg7 66.b6 Rb2 67.Rc7 Kf6 68.b7. Fournier,Frederic (1680) – guest23002, 5 min + 0s chess16.com, 2008.

5.Nf3 Bb7 6.c4 Nf6 7.cd5 Bd5 8.Nc3 Bb7 9.Bc4 e6 10.0–0 Be7 11.d4 0–0 12.Re1 Ra7 13.Ne5 Bd6 14.Qc2 cd4 15.ed4 Qe7 16.d5 Qc7 17.Nc6 Bh2 18.Kh1 Qf4?? ( 18...Bd6!?=) 19.Ne4?? (19.Na7 Qc4 20.Kh2 Bd5+–) 19...Ne4? (19...Bc6 20.Nf6 gf6 21.bc6+=) 20.Qe4?? ( 20.Re4 Qh6 21.Re3 (21.de6 Nc6 22.bc6 Bf4 23.Kg1 Bc6+=) 21...Bg3 22.Kg1 Qh2 23.Kf1 Qh1 24.Ke2 Qh5 25.Ke1 ed5 A) 26.Na7?! dc4 27.fg3 Qh1 28.Kd2 Rd8 29.Kc3 Qh6+–; B) 26.Rg3?! Re8 27.Be2 Qh1 28.Kd2 Qh6 29.Re3 B1) 29...Nc6 30.Rh1 (30.bc6?! Bc6 31.Bd4 Qf4+/–) 30...d4 31.Rh6 de3 32.fe3 gh6 33.bc6 Rd8 34.Ke1 Bc6 35.Qc6+–; B2) 29...Bc6 30.bc6 Rae7= (30...Nc6 31.Rh1 d4 32.Rh6 de3 33.fe3 gh6 34.Qc6 Rd8 35.Ke1+–); C) 26.Ne7 Kh8 27.Rg3+–) 20...Qh6 21.Re3 ( 21.Na7!? Be5 22.Kg1 Qh2 23.Kf1 Bb2 24.Rad1+=) 21...ed5 22.Bd5 Nc6?? (22...Bg3 23.Kg1 Bh2 24.Kf1 Nc6+=) 23.Rh3+– Qh3 24.gh3 Nd8 25.Kh2 Bd5 26.Qd5 Ne6 27.Rg1 Re8 28.Qc6 Rd8 (28...Rea8 29.Bg7! Ng7 30.Qf6 Kf8 31.Qg7 Ke8 32.Qe5 Kf8 33.Qd6 Re7 34.Qh6 Ke8 35.Rg8 Kd7 36.Qc6) 29.Qb6 (29.Bg7 Rc7 30.Be5 Kf8 31.Bc7 Nc7 32.Qc7 Rd5+–) 29...Rad7 30.Bc1 ( 30.Rg7! Ng7 31.Qf6 Rd4 32.Bd4 Rd4 33.Qd4 Ne6+–) 30...Nd4 31.Kh1 Nf3 32.Rf1 Rd6 (32...a4 33.Qa5+–) 33.Qa5 f6 34.Be3 Rd5 35.Qb4 g5 36.Qg4 Ne5 37.Qe6 Kg7 38.b6 Rb5 (38...R5d6 39.Qe7 Kg6 40.f4+–) 39.Qe7 Nf7 40.Rc1 (40...Ra5 41.b7+–) 1–0. Raue,Thorsten (1830) – Eberth,Manfred (1825), Muensterland Verbandsklasse–B, 2003.

5.Nf3 Nd7 6.c4 e6 7.Be2 Ngf6 8.d4 Be7 9.Ne5 Bb7 10.Nc6 Bc6 11.bc6 Nb8 12.dc5 (12.cd5 ed5 13.Bb5 Qd6=) 12...bc5= 13.cd5 ed5 14.c7 (14.Bb5 Qd6 15.c7 Nbd7 16.Bd7 Qd7=) 14...Qc7+= 15.Nc3 0–0 (15...Qb7 16.Rb1 0–0 17.Na4=) 16.Nd5= Nd5 17.Qd5 Nd7 18.Rd1 Nf6 (18...Rad8 19.Bd3 Nf6 20.Qb3+=) 19.Qe5 Qb6 20.0–0 Rfe8 21.Bc3 Bf8 22.Qf4 Ne4 23.Bc4 Ra7 24.Be5+/– Nf6 25.Rb1+– Qd8 26.Rb8 Qe7 27.Bf6 gf6 28.Rfb1 Rb8 29.Rb8 Qe5 30.Qg4 Qg5 31.Qc8 Qg7 32.g3 f5 33.Qc5 Rb7 34.Rc8 a4 35.Qf5 Re7 36.Bd5 Qg6 37.Qf4 Rd7 38.Qb4 Qd6 39.Qg4 (39.Qg4 Kh8 40.Rf8 Qf8 41.Qd7+–) 1–0. Fournier,Frederic (2310) – Capaputi (2310), queenalice.com (Auto–Elite–789), 2011.

5.Nf3 f6 6.c4 e5 7.cd5 Qd5 8.Nc3 Qd8 (8...Qe6 9.Bd3+=) 9.Bc4 Bd6 10.0–0 Bb7 11.d4 cd4 12.ed4 ed4 ( 12...Nd7+/–) 13.Re1 Ne7 14.Nd4 Nd7?! (14...Qd7+–) 15.Nf5 Qc7 (15...Kf8 16.Qd6 Ne5 17.Qd8 Rd8+–) 16.Ng7 Kd8 17.Ne6 (17...Kc8 18.Nc7 Kc7 19.Rc1+–) 1–0. pcmvr (2225) – rpatru (2180), net–chess.com, 2006.

5.Nf3 f6 6.Nh4 Nh6 7.Be2 e5 8.Bh5 g6 9.Be2 Bd6 10.d3 0–0 11.Nf3 Bd7 12.a4 Ra7 13.0–0 Be6 14.d4 e4 15.Nfd2 f5 16.dc5 bc5 17.Nb3 Qh4 18.g3 Qh3 19.f4 ef3 20.Bf3 Bg3 21.Qd2 Bd6 22.Nc3 f4 23.Bg2 Qg4 24.ef4 Bf4 25.Qe2 Qe2 26.Ne2 Be3 27.Kh1 d4 28.Nc5 Bc4 29.Rf8 Kf8 30.Bd4 Be2 31.Be3 Re7 32.Bh6 Ke8 33.Re1 Bg4 34.Re7 Ke7 35.Ne4 Bf5 36.Nc5 Nd7 37.Bg5 Kd6 38.Nb3 Nb6 39.Na5 Kc7 40.Nc4 Na4 41.Ne5 Kb6 0–1. fjanusz52 – pawelek505, kurnik, 2012.

5.Nf3 Bg4 6.Be2 Nd7 7.0–0 Ngf6 8.d3 Qc7 9.Nfd2 Be2 10.Qe2 e6 11.f4 (11.Nf3 Bd6=) 11...Be7 (11...Bd6 12.Qf3=) 12.Nf3 0–0 13.Qe1 (13.Nbd2 Ng4=) 13...Bd6 14.Nbd2 e5 15.fe5 Ne5 16.Qh4 h6 (16...Rae8 17.Rae1=) 17.c4+= dc4 (17...Rae8 18.Be5 Be5 19.Rac1+=) 18.Nc4 (< 18.dc4 Rad8=) 18...Nc4 (18...Nfg4 19.Nfe5 (< 19.Nd6 Qd6 20.Ne5 Ne5+=) 19...Ne5 20.Be5 Be5 21.Rad1+/–) 19.dc4 (19.Qc4 Nd7+/–) 19...Be7 (19...Nd7 20.Rad1+/–) 20.Rad1 Rad8 21.Be5 Qb7 (21...Qc8 22.Qf4+=) 22.Rd8 (22.Qf4 Ne4+/–) 22...Rd8= 23.Qf4 Rd7 24.Bf6 (24.a3 Qe4=) 24...Bf6= 25.a4 ( 25.Kh1!?=) 25...Re7 26.Qg3 Re3 27.Qd6 (27.Qf2 Rc3 28.Qe2 Qd7–+) 27...Re2 (27...Re6 28.Qf4–/+) 28.Rf2 Re6 29.Qd3 (29.Qd1 Qe7 30.Kf1 Re3–/+) 29...Qe7 (29...Qe4 30.Qe4 Re4 31.Rc2–+) 30.Rf1 Re3 31.Qd5 Qe6 32.Qc6 (32.Rd1 Re4–+) 32...Qc6 (32...Qc4?! A) 33.Qb6? Rf3 34.gf3 Bd4 35.Rf2 Qa4–+ (35...Bf2 36.Kf2 Qd4 37.Kg3=); B) 33.Qc8 Kh7 34.Qf5 Kh8 35.Qc8 Kh7 36.Qf5 Kg8 37.Qc8 Kh7=) 33.bc6 Re6 34.c7 Rc6 35.Rb1 Rc7 36.Rb6 Bd4 37.Kf1 g5 (37...f6!?–/+) 38.Nd2 Kg7 39.Nb3 Re7 (39...Bc3 40.Rb5=+) 40.Rb5 Re3 41.Nc5 Rc3 (41...Ra3 42.Ra5 Bc5 43.Rc5 Ra4 44.Ke2=) 42.Nd7 Rc4 43.Ra5 Rc1 44.Ke2 Rc2 45.Kd3 (45.Kf3=) 45...Rc7 (45...Rg2!? 46.Kd4 Rd2 47.Ke5 Rd7=+) 46.Kd4 Rd7 47.Rd5 Rb7 (47...Rc7 48.a5 Rc2 49.g3+=) 48.a5+/– (48...Rb2 49.Kc3+/–) 1–0. orane – kop, Live Game Caissa's Web, 2004.

5.f4 Bb7 6.Nf3 Nd7 7.Be2 e6 8.0–0 Qc7 9.Ne5 f6 10.Nc6 Bc6 11.bc6 Qc6 12.Bh5 g6 13.Bf3 Bg7 14.c4 Ne7 15.Nc3 0–0 (15...Rd8 16.Qb3 Nb8 17.Rab1=) 16.Nb5 (16.Qb3 a4 17.cd5 ed5 18.Nd5+/– (18.Bd5?! Nd5 19.Qd5 Qd5 20.Nd5 a3=)) 16...Rad8 17.a4 Nf5 18.g4 Nd6 19.Qe1? (19.Qb3 Ne4 20.cd5 ed5 21.d3+/–) 19...Nc4–+ 20.Bc3 Nd6 21.Rb1 Nb5 22.ab5 Qd6 23.h4 e5 Black plans d4 24.Qg3 d4 25.ed4 ed4 26.Bb2 f5 27.gf5 Rf5 28.h5 Rdf8 29.Bg4 Rf4 30.Rf4 Rf4 31.Bd7 Rf1!! 32.Kg2 Qg3 33.Kg3 Rb1 34.Ba3 Rb3 (34...Rb3 35.Kf4 Ra3 36.hg6 hg6 37.Be6 Kf8–+) 0–1. elsh1403 – trium29 (2025), kurnik, 2012.

4.e3 c4

5.Nc3 e6 6.e4 d4 (6...a4!?=) 7.Na4+– c3 (better 7...e5!? 8.Bc4 Nf6+–) 8.dc3+– dc3 9.Bc3 (better 9.Qd8 Kd8 10.Rd1 Ke8 11.Nc3+–) 9...b6?? (better 9...Nd7+–) 10.Qd8+– Kd8 11.Nb6 Ra7 12.Rd1 (worse 12.Nc8 Kc8 13.a4 Nd7+–) 12...Nd7 13.Nf3 h6 (13...Kc7 14.Nd7 Bd7 15.b6 Kb6 16.Bd4 Kb7 17.Ba7 Bb4 18.Ke2 Bb5 19.Ke3 Bf1+–) 14.Ne5 Ngf6 (14...Ke8 15.Nc8 Rc7 16.b6 Rc3 17.Bb5 Rc8 18.Bd7 Kd8 19.Be6 Bd6 20.Rd6 Ke7 21.Bc8 Kd6 22.b7+–) 15.Bc4 (better 15.Nf7 Ke8 16.Nc8 Rc7 17.Ncd6 Bd6 18.Nh8 Rc3 19.Rd6 Nc5+–) 15...Ne4 (15...Ke8 16.Nc6 Rc7 17.Ba5 Ne4+–) 16.Bd4 (better 16.Nf7 Ke8 17.Nc8 Rc7+–) 16...Ke8?? (16...Ne5 17.Be5 Bd7+–) 17.Nbd7 (better 17.Nc8!? Rc7 18.b6 Rc8+–) 17...Rd7 18.Nd7 Bd7 19.0–0 a4 20.b6 Bc6 21.Rb1 Nd2 (21...Nd6 22.Ba6 Bb7 23.Bd3+–) 22.b7 (better 22.Bb5!? Bd7 23.Be5 Bb5 24.Rb5 Bd6 25.Bd6 Kd7+–) 22...Bb7 23.Rb7 Nc4 24.Rd1 (better 24.Rfb1 Kd8 25.Ra7+–) 24...Be7 (24...f6+–) 25.Bg7 Rg8 (25...Bd6 26.Bh8 Be5+–) 26.Bh6 (26.Rb8 Bd8 27.Rbd8 Ke7 28.R1d7) 26...f5+– 27.Rdd7 Bf6 28.Rdc7 Nd6 29.Rb8 Bd8 30.Be3 f4 (30...Nf7 31.Bc5 Rg4 32.Re7 Kf8 33.Re6 Kg7 34.c3+–) 31.Bc5 Rg2 (31...Nf7 32.Re7 Kf8 33.Re6 Kg7 34.Bd4 Kf8+–) 32.Kg2 Ne4 33.Re7 Kf8 34.Rd8 1–0. Agiant – jawadslaks, lichess.org, 2019.

5.d3 cd3 6.Bd3 e6 7.Nf3 Nf6 8.0–0 Be7 9.c4 0–0 10.Nbd2 Bd7 11.Ne5 Qb6 12.Nd7 Nbd7 13.cd5 Nd5 14.Nc4 Qb5 15.Ne5 (better 15.Bg7 Kg7 16.Ne5+=) 15...Qb2–/+ 16.Nd7 Rfd8 17.Rb1 Qa2 18.Rb7 Bb4?? (better 18...Nb4!? 19.Nb6 Rd3–/+) 19.Qg4 (better 19.Bh7 Kh8 20.Qh5+–) 19...Qb2 20.e4?? (better 20.Qe4 g6 21.Ne5=) 20...Rd7–+ 21.Rd7 (21.ed5 Rb7 22.de6 Qe5 23.ef7 Kf8–+ (23...Kf7?! 24.Qf3 Kg8 25.Qb7=; worse 23...Rf7 24.Bc4 Qf6 25.Qe2–+)) 21...Nf6 22.Qh4 g6 (better 22...Nd7 23.Bb5 Nf6–+) 23.Rb7+– Qe5 24.Rb5 Qd4 25.Be2 Bc3 (25...Qe4 26.Qf6 Qe2 27.Rb7=) 26.Bf3+= Rd8 27.e5?? (better 27.h3+–) 27...Ne8 (better 27...Qh4 28.ef6 a4 29.h3–+) 28.Rfb1?? (28.Qd4 Bd4 (28...Rd4? 29.Rb8+–) 29.Ra5 Kf8+–) 28...Nc7 (better 28...Qh4!? 29.h3–+) 29.Rb7?? (29.Qd4!? Bd4 30.Ra5 Nd5+–) 29...Na6 (better 29...Qh4 30.Rc7 Be5–+) 30.Qf6 Rf8 31.R7b5 Bb4? (31...Nc7 32.Rb8 Qe5+–) 32.Rd1+– Qc4 33.Rb7 Nc5?? (better 33...Nc7+–) 34.Rf7!! Nd7 (34...Rf7 35.Rd8) 35.Qg7 (35.Rfd7?! Rf6 36.ef6 Bf8+–) 1–0. GuestYYLH – GuestLBVG, freechess.org, 2017.

4.e3 Nd7

5.a4 Ngf6 6.c4 Nb6 7.Nf3 (7.cd5 Nbd5 8.d4 cd4 9.Bd4 Bf5=+) 7...e6 (7...Nc4 8.Bc4 dc4 9.Na3=) 8.cd5 Nbd5 (< 8...Qd5 9.Bf6 gf6 10.Nc3+=) 9.Be2 Be7 10.0–0 0–0 11.Nc3 Nc3 12.Bc3 Nd5 13.Bb2 Bf6 14.d4 b6 15.Rc1 Bb7 16.Qb3 (16.Ba3!? Rc8 17.dc5 bc5 18.Bc5+/–) 16...cd4= 17.Nd4 Qd7 (17...Bd4 18.Bd4 Nf4 19.ef4 Qd4 20.Rc4=) 18.Ba3 (18.Nc6!?+=) 18...Rfc8 19.Nf3 (19.Rfd1 Rc1 20.Bc1 Qc7=) 19...Rc1 ( 19...Nc3!? 20.Bc4 Bd5 21.Bd5 Qd5 (21...ed5?! 22.Rc2=; 21...Nd5?! 22.Rfd1 Rc1 23.Bc1=) 22.Qd5 ed5–/+ (< 22...Nd5 23.e4 Nc3 24.Rfe1–/+)) 20.Rc1= (< 20.Bc1 Nc3 21.Bc4 Bf3 22.gf3 Rd8=+) 20...Rc8 21.Rc8 Qc8 22.Qc4 ( 22.Bc4!?=) 22...Nc3–/+ 23.Bb2 Qc4 (23...Ne2?! 24.Qe2 Bb2 25.Qb2 Bf3 26.gf3=) 24.Bc4 Na4 25.Bf6 gf6 26.Nd4 Kf8 27.h3 Ke7 28.g4 Kd6 29.Kh2 Nb2 30.Ba2 a4 31.Kg3 a3 (31...Kc5 32.Bb1–+) 32.h4? ( 32.Nc2–/+) 32...Nd1–+ 33.Nc2 Nc3 34.Bc4 a2 35.Bd3 Be4 36.Be4 Ne4 37.Kg2 Kc5 38.f3 (38.Na1 Kb5 39.Kf3 Kc4–+) 38…Nd2 (39.Kf2 Kc4–+; 38...Kc4!? 39.Na1–+) 0–1. Wolfram,Reinhard – Blauhut,Holger, corr SOK–89–49, 1989.

5.c4 Nb6 6.cd5 Nd5 (6...Nf6 7.d4 c4 8.Nc3=) 7.a4 (7.d4 cd4 8.Bd4 e6=) 7...Ngf6 8.Bc4 e6 9.Nf3 Nb4 (9...Nb6 10.Be2=) 10.Qb3 (10.d4 cd4 11.Bd4 Bd6+=) 10...Bd6 11.0–0 0–0 12.d4 b6 (12...cd4 13.Bd4 b6 14.Rd1+=) 13.Nbd2 (13.dc5 Bc5 14.Nc3 Bb7=) 13...Bb7 14.Rfe1 (14.dc5 Bc5 15.Rfd1 Qe7=) 14...Rc8 15.e4 (15.Rad1 cd4 16.Bd4 Ne4=) 15...Be7 (15...Bf4!?=) 16.Rac1+= Rc7 17.Qe3 Qb8 18.Ne5 Rd8 19.Red1 Qa7 20.Qb3 Bc8 21.Qg3 ( 21.dc5!? Rc5 22.Qg3+=) 21...cd4=+ 22.Nf7 Rc4?? (22...Kf7 23.Be6) 23.Rc4 (23.Nd8!? Rc1 24.Rc1 Qd7+–) 23...Kf7+/– 24.Rc7 (24.Bd4?! Bb7+=; 24.Rd4?! Kg8+=) 24...Qa8 25.Re7! Ke7 26.Qg7 Ke8 27.Qf6 d3?? (27...Nc2 28.Qh8 Ke7 29.Qh7 Ke8 30.Qg6 Kf8+–) 28.Qh8 Kf7 (28...Kd7 29.Qh7 Kd6 30.e5 Kc5 31.Qe7 Kd5 32.Qh4 Bb7 33.Qd4) 29.Qg7 Ke8 30.Bf6 (30...Nd5 31.Qg8 Kd7 32.Qd8#) 1–0. Woelfelschneider,Peter – Dorschfeldt,Eberhard, CiF, 1990.

5.c4 Ngf6 6.a4 e5 7.Qc2 d4 8.ed4 ed4 9.Bd3 Bd6 10.Ne2 0–0 11.0–0 h6 12.f3 Qc7 13.g3 Ne5 14.f4 Nd3 15.Qd3 b6 16.Na3 Bb7 17.Nc2 Rae8 18.Ncd4 cd4 19.Nd4 Bc5 20.Rae1 Rd8 0–1. captainevans – senilis (1670), playok.com, 2012.

5.Nf3 Qc7 +=.

5.Nf3 Ngf6 6.c4 e6 (--> 3.Bb2 c5 4.e3 e6 5.c4 Nf6 6.Nf3 Nbd7).

5.Nf3 Ngf6 6.Be2 e6 7.0–0 Be7 8.a4 0–0 9.c4 b6 10.d4 Bb7 11.Nc3 dc4 12.Bc4 cd4 13.Nd4 Qc7 14.Qe2 Nc5 15.Rac1 Rac8 16.Rfd1 Rfd8 17.f3 g6 18.f4 (18.Qc2 e5 19.Nc6 Bc6 20.bc6 Qc6+=) 18...Ne8+= 19.Bd3 Nd3 20.Rd3 Bf6 (20...Qc4 21.Nc6 Bc6 22.Rd8 Qe2 23.Ne2 Rd8 A) worse is 24.Rc6 Rd2 25.Rc8 Kf8–/+ (worse is 25...Rb2 26.Re8 Bf8 27.Nd4+=; 25...Re2?? 26.Re8 Bf8 27.Ba3+–); B) 24.bc6=) 21.Nd1+= Qd7 22.Rc8 Qc8 (worse is 22...Bc8 23.Nf2 Qc7 24.Rc3+=) 23.Rd2 Qc5 24.Nf2 Qb4 25.Qd1 Bg7 (25...Rd7 26.Qc2+=) 26.Nd3 Qc4 (worse is 26...Bd4 A) 27.Nb4? Be3 28.Kf1 Rd2–+ (28...Bd2 29.Nc6 Bc6 30.bc6+/–); B) worse is 27.ed4 Qd6+=; C) 27.Bd4 Qd6 28.Ne5+/–) 27.Ne5 Be5 28.fe5 Qb4 29.h3 h5 (29...Be4 30.Rf2=) 30.Kh2 (30.Re2 Rd5+=) 30...Ba8 31.Kg1 h4 32.Kh2 Bb7 33.Qc2 Be4 34.Qd1 (34.Qe4 Qd2 Deflection) 34...Rd7 (34...Ng7 35.Qc1 Qa4 36.Nf3+=) 35.Rf2= Bb7 (35...Qc5 36.Qg4 Qe5 37.Kg1=) 36.Qc2 Ng7 37.Nc6 Qe1 38.Re2 Qf1 39.Rd2 Qe1 40.Rd7 Qg3 41.Kg1 Qe1 42.Kh2 Qg3 43.Kg1 Qe1 44.Kh2 ½–½. marekt (2210) – housemd (2055), gameknot.com, 2015.

5.f4 Ngf6 6.Nf3 e6 (--> 3.Bb2 c5 4.e3 e6 5.f4 Nf6 6.Nf3 Nbd7).

4.e3 e5

5.c4 d4= 6.ed4 ed4 7.d3 Nf6 8.Nf3 Bd6 9.Be2 0–0 10.0–0 b6 11.Nfd2 Bb7 12.Bf3 Qc8 13.h3 Nbd7 14.Bb7 Qb7 15.Re1 Ne5 16.Nf1 Rae8 17.a4 Qd7 18.Na3? (better 18.Ng3!?–/+) 18...Qf5–+ 19.Ng3 Qd3 20.Rc1 (20.Nf1 Qg6–+) 20...Qd1 (better 20...Qg6!? 21.Rb1 Rd8–+) 21.Rcd1 Nfd7 (21...Ng6 22.Nf5 Re1 23.Re1–+) 22.Ne4 (22.Nf5 Bc7–+) 22...Bc7–+ 23.f4 (23.f3 Re7–+) 23...Ng6 (better 23...Nd3! 24.Rd3 f5 25.Nf6 Nf6 26.Rf1–+) 24.g3 f5 25.Ng5 h6?? (25...Re1 26.Re1 Bd8 27.Ne6–+) 26.Nf3?? (better 26.Ne6 Bd6 27.Nf8 Kf8 28.Re8 Ke8 29.Nc2=) 26...Kf7 27.h4 Re4 28.Nd2 Rfe8 (better 28...Re1 29.Re1 Nf6–+) 29.Ne4=+ fe4 30.Nb1 (30.Nc2 Bd8=+) 30...e3 (30...Nf6 31.Kg2–/+) 31.Kg2 Ne7 (31...Bf4 32.gf4 Nf4 33.Kg3 Nh5 34.Kh3 Ne5 35.Bd4 cd4 36.Rd4 Nf3 37.Rd7 Kg8–+) 32.Kf3?? (32.Re3 g5 33.fg5 de3 34.Rd7+–) 32...Nf5–/+ 33.Na3 h5 (better 33...Nf6!? 34.Nc2 Ne4 35.Ne3 Ne3 (worse 35...de3 36.Rd7 Kg8 37.Rc7+=) 36.Re3 Ng5 (36...de3?! 37.Rd7 Ke6 38.Rc7=+) 37.hg5 Re3 38.Kf2 hg5 39.Bd4 cd4 40.Rd4 gf4 41.gf4 Re6–+) 34.Nc2=+ Nf6 35.Re2? (better 35.Bd4 Nd4 36.Nd4 cd4 37.Rd4=) 35...Ne4–+ 36.Rg1?? (better 36.Ne3 Neg3 37.Nf5 Ne2 38.Nd4 cd4 39.Bd4–+) 36...Nd2 (better 36...Neg3 37.Ne1 Ne2 38.Ke2 Bf4 39.Ng2–+) 37.Rd2 ed2 38.Rd1 Ne3 (38...d3 39.Rd2 dc2 40.Rd7 Re7 41.Rd2–+) 39.Rd2? (39.Ne3 de3 40.Ke2–+) 39...Nc4 40.Bc1 Nd2 41.Bd2 d3 42.Ne3 c4 (better 42...Re7!? 43.Nd5 Re2 44.Be3–+) 43.Nc4 Bd8?? (better 43...Re2!?–+) 44.Be3?? (44.Nd6!? Ke7 45.Ne8 Ke8 46.Ke4+–) 44...Be7?? (better 44...Kg6–/+) 45.Nb6?? (better 45.Bb6 Rc8 46.Ne5 Ke6 47.Nd3+=) 45...Rd8 (better 45...Bc5! 46.Nc4 Be3 47.Nd6 Kf8 48.Ne8 d2–+) 46.Nc4–/+ Bb4 47.Bd2 (47.Nd2 Ke6=+) 47...Bd2 48.Nd2 Rc8 (better 48...Rd4 49.Ke3 Ra4–/+) 49.Ke3+= Rd8 (49...Rc2 50.b6 Ke7 51.Kd3 Rb2=) 50.b6 (better 50.Nb3!?+=) 50...Ke6=+ 51.Nc4 (51.Nb3 d2 52.Nd2=+) 51...Kd5 (51...d2!? 52.Nd2 Kd5=+) 52.Kd3 (52.Na5 d2 53.Kd2 Kc5 54.Kc2 Kb6 55.Nc4 Kc5=+) 52...Kc5 53.Kc3 Rd4 (better 53...Kc6!?=) 54.Na5+– Ra4?? (better 54...Rd1 55.b7 Rd8+–) 55.b7+– Ra5 56.b8Q Ra3 57.Kd2 Rg3 58.Qe5 Kc4 59.f5 (59.Qh5 Kb4+–) 59...Rg2 (59...Rg4 60.Ke3+–) 60.Ke3 Rc2 (60...Rg1 61.Qc7 Kb4 62.Qe7 Kc3 63.Qg5 Rg5 64.hg5+–) 61.Qe4 (61.Qg7 Kb5+–) 61...Kb3 62.Qc2 (better 62.Qb7 Ka3 63.Qg7+–) 62...Kc2= 63.Kf4 Kd3 64.Kg5 Ke4 65.Kg6 Kf4 66.Kh5 Kf5 ½–½. BeepBeepImAJeep (2760) – HelloItsDimitri (2600), lichess.org, 2020.

5.c4 d4= 6.ed4 ed4 7.d3 Nf6 8.Nf3 Bd6 9.Be2 0–0 10.0–0 b6 11.Re1 Bb7 12.h3 Bc7 13.Nbd2 Qd6 14.a4 Nbd7 15.g3 Ne5 (15...Rfe8 16.Nh4=+) 16.Ng5 (16.Ne5!? Qe5 17.Bf3 Bf3 18.Qf3=) 16...h6–/+ 17.Nge4 Ne4 18.Ne4 Be4 19.de4 d3?? (better 19...Qe6–/+) 20.Be5+– Qe5 21.Bd3 Rad8 22.Qe2 Rd4 23.Rad1 Rfd8 24.Bc2 (24.Rd2!?+–) 24...Qe6= 25.Rd4 Rd4 26.Bb3 (26.e5 A) 26...Rc4?? 27.Bb3 Re4 28.Be6 Re2 29.Bf7 (29.Re2?! fe6 30.f4 Kf7+–) 29...Kf8 30.Re2 Kf7 31.f4+–; B) 26...Qh3 27.Be4+=; C) 26...Qc4 27.e6 Qe2 28.Re2 Kf8=) 26...Qh3=+ 27.Rd1? (27.e5 Qe6=+) 27...Be5?? (better 27...Bg3 28.f3 Be5–+) 28.Rd4= Bd4 29.Qf3 h5 30.Bd1 (30.Qf4 Qe6=) 30...h4=+ The mate threat is hxg3 31.gh4 Qh4 32.Kg2 Qf6 (32...Kf8 33.Qg3 Qe4 34.Bf3=) 33.Qf5 (33.Qf6 Bf6 34.f4 Bd4+=) 33...Qf5= 34.ef5 f6 35.Kf3 Kf7 36.Bc2 Ke7 37.Be4 Kd6 38.Bd5 (38.Kf4 Be5 39.Kg4 Bb2=) 38...Ke5 39.Be6 Bc3 40.Bd7 Kd4 41.Be6 Ke5 42.Ke3 Bb4 (42...g5 43.f4 gf4 44.Kd3–/+) 43.Bd7 Bc3 44.f4 Kd6 45.Be6 Bd4 46.Ke4 Bc3 47.Bd5 Bb2 48.Bf7 Bc1 49.Bg6 Bb2 50.Bf7 Ba3 51.Bg6 Bb4 52.Bf7 Bc3 53.Bg6 Bb2 54.Bf7 ½–½. BeepBeepImAJeep (2635) – PG2019 (2330), lichess.org, 2019.

5.Nf3 e4= 6.Ng1 (6.Ne5 Be6 7.f4 f6=+) 6...Nf6 7.d3 Bd6 (7...a4 8.Be2=+) 8.de4= Ne4 (8...de4 9.Nd2 Be7 10.Nc4=) 9.Nc3 (9.Bg7 Rg8 10.Bb2 a4+=) 9...Nc3 (9...Be5 10.Qh5 Bc3 11.Bc3 0–0=+ (worse 11...Nc3 12.Qe5 Kf8 13.Qc3+=)) 10.Bc3+= 0–0 (10...Bf8 11.Ne2+=) 11.Qd5+– Be6 (11...Qe7 12.Qh5+–) 12.Qd2 (better 12.Qb7!? Nd7 13.Rd1+–) 12...Qe7 (12...Qb6 13.Nf3+=) 13.Rd1 (13.Ba5 c4 14.Bc3 Ra4+–) 13...Bc7 (13...Rd8 14.Nf3+=) 14.Nf3 Nd7 (14...Ba2 15.Bg7 Kg7 16.c4+=) 15.Qc1 Nb6 Black prepares c4 (15...f6 16.Qa3+=) 16.Be2 Rfd8 (16...f6 17.a3+=) 17.Ba1 (17.0–0 Na4 18.Ba1 c4+=) 17...Na4 (17...Rd1 18.Qd1 f6 19.Qb1=) 18.0–0+= c4 19.Nd4 (19.Rd8 Rd8 20.Bd4 Bd5+=) 19...Bd5 20.Bf3 (20.Qd2 c3 21.Qd3 Ba2 22.Bc3 Bh2 23.Kh2 Qc7 24.g3 Nc3–/+ (24...Qc3?! 25.Ra1 Qb2 26.Bf3=)) 20...Bf3 (20...Qe5!? 21.g3 Bf3 22.Nf3 Qb5=) 21.Nf3+= (21.gf3 Qg5 22.Kh1 Bh2–+) 21...Rd1 (21...Qb4 22.Qb1+=) 22.Rd1+– Rd8 (22...Re8 23.Bd4+–) 23.Rd4 (23.Rd8 Qd8 24.Qd2 Qd6+–) 23...Rd4+= 24.Nd4 Qd6 (24...c3+=) 25.Nf3 (better 25.g3+–) 25...g5?? (25...Qb4 26.Qd1=) 26.Bd4 (better 26.Be5!? Qe7 27.Bc7 Qc7 28.Qd2+–) 26...g4+= 27.Be5 Qd7 (27...Qc5 28.Bc7 gf3 29.Ba5 Qb5 30.Be1+=) 28.Bc7 Qc7 (better 28...gf3!? 29.Ba5 Qb5+=) 29.Nd4+– Qe5 (29...Qc5 30.a3+–) 30.Qd1 (30.Qa3 Nc5 31.Qa5 Ne6+–) 30...Nc5? (better 30...Qg5+–) 31.Qg4 Kf8 32.Qc8 Kg7 33.Nf5 Kf6 34.Nd4 Ne6?? (34...Kg7 35.g4 Qd5+–) 35.Qc4 (35.Qh8 Ng7+–) 35...Ng5 (35...Ke7 36.c3 h5+–) 36.f4 (better 36.h4 Ne4 37.Qc8+–) 36...Qe3–+ 37.Kf1 Ne4 (37...Qf4?! 38.Ke2 Ne6 39.c3 Qh2 40.Kf2=) 38.Qe2 Qf4?? (better 38...Qd4 39.g3 Nc3–+) 39.Ke1?? (better 39.Nf3+=) 39...Qc1–+ 40.Qd1 Qe3 41.Qe2 Qg1 (better 41...Qd4 42.g3 Qa1 43.Qd1 Qa2 44.Qd4 Kf5 45.Qd7 Qe6–+) 42.Qf1= Qf1 43.Kf1 Nc3 (43...Ke5 44.Nf3 Kd5 45.Ke2=) 44.Kf2 (44.Nb3 a4 45.Nc5 Nb5 46.Nb7 Nc3=) 44...Ke5 (44...Na2 45.Ke3=) 45.Ke3 (45.Nf3 Kd5 46.Ng5 Na2=) 45...Nd5 (45...a4 46.Nf3 Kf6 47.Kd4 Na2 48.Ne1=) 46.Kd3 Nf4 47.Kc4 Ng2 48.Nc6?? (better 48.b6 Kd6 49.Kb5+=) 48...bc6–+ 49.b6 (49.bc6 Kd6 50.Kb5 Ne3–+) 49...Kd6 50.b7 (50.Kb3 Ne3–+) 50...Kc7 51.Kc5 (51.Kd4 Ne1 52.Kc3 Kb7–+) 51...Kb7 52.c4 (52.c3 f5–+) 52…Kc7 0–1. FeegLood (2810) – lovlas (2545), lichess.org, 2017.

4.e3 e6

5.a4 c4 6.Nf3 f5 7.Ne5 Nf6 8.d3 cd3 9.Bd3 Bd6 10.0–0 0–0 11.c4 Nbd7 12.Nd7 Bd7 13.cd5 ed5 14.Qf3 Ne4 15.Qe2 Qh4 16.h3 Rae8 17.Nd2 h6 18.Ne4 fe4 19.Bc2 Rf5 20.Qg4 Qg4 21.hg4 Rg5 22.f3 ef3 23.gf3 Re3 24.Bc1 Bc5 25.Be3 Be3 26.Kg2 h5 27.Rfe1 d4 28.Bb3 Kf8 29.Rad1 hg4 30.Re3 gf3 31.Kf3 Bg4 32.Ke4 de3 33.Rf1 Ke7 34.Ke3 Be6 35.Bc2 Rg3 36.Kf4 Rc3 37.Be4 Rc4 38.Kf3 Ra4 39.Re1 Kd6 40.Bb7 Ra3 41.Ke4 Rb3 42.Bc6 a4 43.Rd1 Ke7 44.Ra1 a3 45.b6 Rb6 46.Bd5 Bd5 47.Kd5 Ra6 48.Kc4 a2 49.Kb3 g5 50.Ra2 Ra2 51.Ka2 Ke6 52.Kb2 Ke5 53.Kc2 Kf4 54.Kd2 Kf3 55.Ke1 Kg2 56.Ke2 g4 57.Ke1 g3 58.Ke2 Kh2 59.Kf1 g2 0–1. aqqqpppa (1895) – Nader1346 (2020), Lichess.org, 2017.

5.c4 b6 6.a4 Bb7 7.Nf3 Nf6 8.Be2 Nbd7 9.0–0 Be7 10.d4 0–0 11.Nbd2 Rc8 12.Rc1 Re8 13.h3 h6 14.Rc2 Rc7 15.Qa1 Qc8 16.cd5 Bd5 17.Rfc1 Rd8 18.dc5 Rc5 19.Rc5 Nc5 20.Nd4 Rd7 21.Bf3 Qb7 22.Bd5 Qd5 23.Ba3 Rc7 24.Nc4 Qb7 (24...Nd3!? 25.Rc3 Nf4+=) 25.Bc5= Bc5 26.Nc6 Nd5 (26...Nd7 27.Qc3+=) 27.N4e5 (27.N4a5!? Qa8 28.Nc4+/–) 27...Kf8 28.Qb1 Kg8 29.Qe4 Qc8 30.Qf3 Qe8 31.Ng4 Qf8 (31...Rc8 32.e4 Nb4 33.Qg3=) 32.Qg3 (32.e4 Nb4 33.Qg3+=) 32...Kh8 (32...Bd6 33.f4 f5 34.Nf2=) 33.Qe5 Rb7 (33...Bd6 34.Qd4+=) 34.Rd1 Bd6 35.Qb2 Bc5? (better is 35...f5 36.Nge5 Qf6+=) 36.e4+– f5? (36...Nc7 37.Rd7 f6 38.Nd8+–) 37.ed5 (better is 37.Nge5 Qf6 38.ed5+–) 37...fg4 38.de6 (38.hg4?! Rd7=) 38...gh3?? (better is 38...Qf5 39.hg4 Qe6+/–) 39.Rd8 (39.gh3?! Qf5 40.Rd8 Kh7+/–) 1–0. mikebaldini (1620) – pawngrabber123 (1670), gameknot.com, 2014.

5.Nf3 b6 6.Be2 f6 7.d4 (7.0–0 Bd6 8.c4 Ne7 9.Nc3 0–0 10.d4 cd4 11.Qd4 a4 12.a3+=) 7...c4 (7...cd4 8.ed4 Bb4 9.Nbd2 Ne7 10.0–0 0–0 11.Bd3 a4 12.a3+=) 8.a4 (8.e4 Bd7 (8...Qd7 9.a4 Bb4 10.c3 Bd6+= 11.Ba3 Ba3 12.Na3+=) 9.a4 Bb4 10.c3 Bd6 11.ed5 ed5 12.Ba3+=; 8.0–0 Bd6 9.e4 Qd7 10.a4 Ne7 11.e5 Bc7 12.Ba3+=) 8...Bd6 (8...Bb4 9.c3 Bd6 10.e4 Ne7 11.Ba3 Bf4 12.Nbd2+=) 9.0–0 (9.e4 Ne7 10.Nbd2 0–0 11.0–0 Ng6 12.Re1=) 9...Qc7 (9...Ne7 10.Nbd2 0–0 11.e4 Ng6 12.Re1=) 10.h3 (10.Ba3 Ne7= 11.Bd6 Qd6 12.Nc3+=) 10...g5 (10...Ne7!?= 11.Ba3 0–0 12.Bd6=) 11.Nfd2 (11.Ba3 h5 12.Bd6+=) 11...Ne7 12.Bh5 Kd8 13.e4 Bd7 (13...Rf8!?+=) 14.Qf3+/– Bf4 15.g3 Bd2 16.Nd2 Rf8 (16...f5!?+/–) 17.Ba3+– Nbc6? (17...c3 18.ed5 Nd5 19.Bf8 cd2+–) 18.bc6 Bc6 19.e5! f5 20.Bd6 Qd7 21.Qa3 Rg8 22.Be7 Qe7 23.Qe7 Ke7 24.Nb1 Rg7 25.Nc3 Kd7 26.Rfb1 Kc7 27.f3 Rag8 28.Rb2 Rb8 29.Nb5 Bb5 30.Rb5 Kb7 31.Rab1 Ka7 32.c3 Re7 33.Kf2 Rbb7 34.Ke3 Rb8 35.R5b2 Reb7 36.f4 h6 37.g4 Rf8 38.Rf2 Rg7 39.Rg1 gf4 40.Rf4 Rfg8 41.Rgf1 b5 42.ab5 Rb8 43.Rb1 Kb6 44.gf5 ef5 45.Rf5 1–0. Hingst,Thomas (2085) – Brosmann,Peter, RSS5E NoEngine–97, 2009.

5.Nf3 Nd7 6.c4 Ngf6 (--> 3.Bb2 c5 4.e3 e6 5.c4 Nf6 6.Nf3 Nbd7).

5.Nf3 Nf6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c5 5.Nf3 a5).

5.f4 Nd7 6.Nf3 b6 7.Be2 Bb7 8.0–0 Ngf6 9.Qe1 Bd6 10.Ne5 Rg8!? 11.d4 Qe7 12.Nd2 0–0–0 13.Nc6!? Bc6 14.bc6 Nb8 15.Bb5 Ne4 16.Ne4 de4 17.c4 f5 18.dc5 Bc5 19.Be5 Rd3 20.c7 Nc6 21.Bc6 Re3 22.Qe3 Be3 23.Kh1 g5 24.Bb5 Kb7 25.Rad1 Bf4 26.Rd7 Qc5 27.Bd4 Qa3 28.Rd8 Bc7 29.Rg8 Qd3 30.c5 Qd4? 31.c6 Ka7 32.Rc8 Qe5 33.Rc7 Qc7 34.Rd1 Qe5 35.c7 Kb7 36.Rc1 Qc7 37.Rc7 Kc7 38.Kg1 Kd6 39.Kf2 Kc5 40.Be8 Kd4 41.Bd7 Kd5 42.g4! f4 43.a4 e5 44.Ke2 Kd4 45.Bb5 e3 46.Ba6 e4 47.Bb5 f3 48.Ke1 Ke5 49.Bd7 Kf4 50.Bc8 e2 51.Kf2 e3 52.Ke1 h6 53.Bd7 Ke4 ½–½. Thoernblom – Ivarsson, Kalmar 1966.

5.c4 Nf6

6.Nf3 Bd6 7.Bd3 (7.Bf6 Qf6 8.Nc3 dc4=) 7...0–0 8.0–0 b6 9.Nc3 Bb7 (9...Nbd7 10.Rc1=) 10.Ng5 (10.cd5 ed5 11.Bf5 Re8=) 10...h6 11.Nf3 dc4 12.Bc4 Nbd7 13.h3 Qc7 14.Be2 Rad8 15.Qc2 Ne5 16.Ne5 Be5 17.f4 Bc3 18.Qc3 Be4 19.d3 Bh7 20.e4 Rd4 21.a3 Rfd8 (21...Qe7 22.Qe1 Rd7 23.Qg3+=) 22.Qc2 R4d7 23.Rac1 Ne8 24.Rf3 f6 25.Qb3 Re7 26.a4 f5 (26...Bg6 27.e5+=) 27.Be5 Qd7 28.ef5 Bf5 29.Rg3 Qd5 30.Qb2 Rdd7 (30...Qd7 31.d4 cd4 32.Rc4+–) 31.Re3 Rf7?? (better 31...Qa8+–) 32.Bf3+– Qd3 33.Rd3 Rd3 34.Bh5 g6 35.Be2 Rd8 36.Bc4 Rfd7 37.g4 Rd2 38.Qb3 (worse 38.gf5 Rb2 39.Bb2 gf5 40.Be6 Kf8 41.Bf5 Kf7+–) 38...Be4 39.Be6 Kf8 40.Qe3 (40.Qe3 Bc2 41.f5+–) 1–0. GuestPBNJ – VjjV, freechess.org, 2017.

6.Nf3 Ne4 7.Bd3 Nd6 (7...Nd7 8.cd5 ed5 9.Nc3 Nc3 10.Bc3+=) 8.cd5 (8.Na3 Nd7+–) 8...ed5 9.0–0 Bd7 (9...Be6!?+–) 10.Nc3+– c4 (10...Be6 11.e4 Nc4 12.Bc4 dc4 13.Nd5+–) 11.Be2 (better 11.Bc2 Nb5 12.Nd5+–) 11...Bb5? (better 11...Be6+–) 12.Nb5 (12.Nd5?! Bc6 13.Nf4 Nd7+–) 12...Nb5 13.Qa4 Qd7 14.Ne5 Nc3 15.Qd7 (15.Nd7? Na4 16.Nf8 Nb2–+) 15...Nd7 16.Bc3 (worse 16.dc3 Ne5 17.Rfd1 Rd8=) 16...Ne5 (16...Bb4 17.Nf3 0–0 18.Rfb1+–) 17.Be5 f6 (17...b5 18.Bd4 Bb4 19.Rab1+–) 18.Bd4 Bb4 19.Rab1 Kf7 (19...0–0 20.Bf3 Rfd8 21.Rfd1+–) 20.a3! Bd2 (20...Ba3 21.Rb7 Pinning (21.Rb7 Deflection)) 21.Rb7 Kg6 22.Rd1 c3 23.Bd3 f5 (23...Kh6+–) 24.Rg7 (24.Rdb1 Ra6 25.Rg7 Kh5 26.Be2 Kh6 27.Ba6 Rf8 28.Rb6 Rf6 29.Bf6 Be3 30.Bd4 Kh5 31.Be2 Kh4 32.fe3 c2 33.Bf6) 24...Kh6 25.Bf5 Rhg8 (25...Rag8 26.Rd7 a4+–) 26.Rh7 Kg5 27.g4 c2 (27...Be3 28.fe3 c2 29.h4) 28.Rh5 (28.h4) 1–0. DEFFM – GuestCJBM, freechess.org, 2019.

6.Nf3 Nbd7

7.a4 b6 8.d4 Bb7 9.cd5 Bd5 10.Nc3 Bb7 11.Be2 cd4 (11...Rc8 12.Rc1=) 12.ed4 (12.Qd4 Nc5=) 12...Bb4 13.0–0 0–0 14.Ne5 Rc8 15.Na2 (15.Bf3 Qc7 (15...Rc3?! 16.Bc3 Bc3 17.Bb7=) 16.Bb7 Qb7+=) 15...Bd6+= 16.Rc1 Rc1 17.Qc1 Qb8 18.f4 Rc8 19.Nc3 Bb4 (19...Ne5? 20.fe5 (worse is 20.de5 Bc5 21.Kh1 Qa8+=) 20...Be5 21.de5 Qe5 22.Qd2+–) 20.Nd7 Nd7 21.Qe3 Nf6 22.Rc1 Bc3–/+ 23.Rc3 Rc3 24.Bc3 Nd5 25.Qd2 Nf4 26.Bf1 Nd5 27.Bb2 Qd6 28.Be2 Nf4 29.Bf1 e5 30.Bc1 Ne6 31.de5 Qe5 32.Qe3 Qc7 33.Bb2 Bd5?? 34.Ba3 f5 35.Be2 f4–/+ 36.Qd3 Qe5 37.Qd2 Nd4 38.Bd1 Qe3 39.Qf2 Qa3 40.Qd4–/+ Qe3 41.Qe3 fe3 42.Kf1 Bc4 43.Ke1 Kf7 44.Be2 Bd5 45.Bf3?? Ke6 46.Ke2?? Bb3 47.Ke3 Ba4 48.Bc6 Ke5 49.Be4 h6 0–1. Palikarski,Vasil – Boichev,Marian, BUL–ch qual, 2004.

7.a4 b6 8.d4 Ne4 9.Bd3 Nd6 10.Nbd2 f6 11.Qc2 Nf5 12.g4 Nh6 13.Rg1 Nf7 14.Bh7 Bb7 15.cd5 Bd5 16.Be4 cd4 17.Bd5 ed5 18.Bd4 Rc8 19.Qf5 Bb4 20.Qd5 Rc2 21.Kd1 Qc7 22.Qb3 Rd2 23.Nd2 Qh2 24.Ke2 Qd6 25.Rh1 Rh1 26.Rh1 Nc5 27.Qc2 Bd2 28.Bc5 Qd5 29.Bb6 Be3 30.Rd1 Qe6 31.Be3 Qg4 32.Kd2 Ne5 33.Kc1 Nc4 34.b6 Nb6 35.Bb6 Qf4 36.Rd2 Qg5 37.Qc7 Kf8 38.f4 1–0. Roczniak – Smigielski, Poland.

7.a4 b6 8.Be2 Bb7 9.0–0 Bd6 10.cd5 ed5 11.d3 (11.d4 c4=) 11...0–0 12.Nbd2 Qe7 (12...Re8 13.Qc2=) 13.Qb3 (13.Qc2 Rfe8=) 13...Rac8 (13...d4 14.Nc4=) 14.Rac1 (14.Qc2 Rfe8=) 14...Ng4 (14...Rce8 15.Qc2=) 15.Rfe1 Rfe8 16.Bf1 (16.Qc2 Qe6=) 16...Nge5 17.Ne5 Ne5 ½–½. Tarakanow,WP – Bohak,Ivan Bozidar, corr ICCF EU/M/GT–74, 1972.

7.a4 b6 8.Be2 Bd6 9.0–0 Bb7 10.d4 Rc8 11.Nbd2 0–0 12.Rc1 Ne4 13.Ne4 de4 14.Nd2 cd4 15.ed4 f5 16.f4 Rf6 17.Qb3 Rh6 18.g3 g5 19.Qe3 gf4 20.gf4 Nc5 21.Rf2 Na4 22.Rg2 Rg6 23.Rg6 hg6 24.Ba1 Nc5 ( 24...Qh4 25.Rf1 g5–+) 25.Qg3 Kf7 26.dc5? (26.Re1!?=+) 26...Bc5–/+ 27.Kf1 Qd2 28.Rd1 Qe3 29.Qe3 Be3 30.Rd7 Kf8 31.Rb7 g5? ( 31...Rd8+/–) 32.Bh5?? ( 32.fg5 f4 33.h4+–) 32...gf4?? (32...Bf4 A) < 33.Rb6 Rc4 34.Bb2 Rc2 (< 34...Bh2 35.Re6 Rc8 36.Bg6+/–) 35.Ba3 Kg7=+; B) 33.Bg7 Kg8 34.Bb2+=) 33.Rf7 ( 33.Be5 Rd8 34.Rf7 Kg8 35.Rg7 Kf8 36.Bf6+–) 33...Kg8+= 34.Rg7 Kf8 35.Rf7 ½–½. Schwichtenberg,Juergen – Laux,Gerhard, Bad Wildungen op Seniors, 1998.

7.a4 Nb6 8.Qc2 Nc4 (8...Bd6 9.Na3=) 9.Bc4+= dc4 10.Qc4 (10.Na3 Qd3 11.Qc4 Qf5+=) 10...b6= 11.e4 Bb7 12.Nc3 Be7 13.0–0 Qc7 14.Rfe1 0–0 15.d4 Rac8 16.d5 ed5 17.Nd5 Nd5 18.ed5 Bd6 19.Ne5 Be5 (19...Rce8!? 20.f4 f6=) 20.Be5+= Qd7 Attacks the isolani on d5 21.d6 Rce8 22.h3 Re6 23.Re3 Rfe8 24.Rae1 Kf8 25.Qg4 f6?? (better 25...g6+–) 26.Bf6!+– (26.Bf6 Re3 27.Qd7 Re1 28.Kh2 gf6 29.Qb7+–) 1–0. Pindear – Indoors, internet, 2019.

7.a4 Nb6 8.cd5 Nbd5 9.Be2 Be7 10.0–0 0–0 11.d4 b6 12.Nc3 Bb7 13.Rc1 Nb4 14.Ne5 (14.Qd2 cd4 15.Qd4 Rc8=) 14...Rc8 15.Bf3 (15.dc5 Rc5 (worse 15...bc5 16.Qd8 Bd8 17.Nc4+–) 16.Nd3 Rg5=) 15...Nfd5 (15...Bf3!? 16.Nf3 c4=+) 16.Nd5 Nd5 17.dc5 Bc5 18.Qb3 Qg5 (18...Qe7 19.Rfd1=) 19.Nd7+= Rfd8 20.Nc5 bc5 21.Rfd1 Ba8 22.Rc4 Nb4 (better 22...Qe7!?+=) 23.Rg4+– Qf5? (23...Bf3 24.gf3 (24.Rg5? Rd1 25.Qd1 Bd1 26.Bg7 h6–+) 24...Qh5 25.Rd8 Rd8 26.Bg7+–) 24.Rg7 (better 24.e4!? Be4 25.Re4 Rd5+–) 24...Kf8 25.Bg4 (25.Be2 Rd1 26.Qd1 e5+–) 25...Qe4? (better 25...c4!? 26.Bf5 cb3+–) 26.Bh5+– Rd1 (26...Qf5 27.g4 Qf3 28.Rd8 Rd8 29.Rf7 Qf7 30.Bf7 c4 31.Bg7 Kf7+=) 27.Qd1 Threatening mate... how? 27...Qb7 (27...Nd3 28.Bf6 Bd5+–) 28.Qd6 Ke8 (28...Qe7 29.Rf7 Kg8 30.Qg3 Qg5 31.Qg5) 29.Rg8 1–0. BeepBeepImAJeep – Tornon (2115), lichess.org, 2018.

7.a4 Bd6 8.Na3 b6 9.d4 Bb7 10.cd5 Bd5 11.Nc4 Bc7 12.Be2 0–0 13.0–0 Ne4 14.Rc1 Rc8 15.Ncd2 Bb8 16.Ne4+/ = Be4 17.Bd3 Bb7 18.Bb1 Qf6 19.Qc2 Qh6 20.d5 ed5 21.g3 d4 22.Ng5 Nf6–/+ 23.Qf5 Rcd8–+ 24.h4 Rd5?? 25.Qd3?? Rg5–+ 26.ed4 Qh4 27.d5 Bg3! 28.Bf6 Bf2# 0–1. Behle,Burkhard (1885) – Pick,Stefan (2040), Bergisch Gladbach–ch, 1996.

7.a4 Bd6 8.cd5 ed5 9.Be2 =.

7.a4 Bd6 8.Be2 0–0 9.0–0 Qc7 (9...e5 10.d4 cd4 11.ed4=) 10.d4= b6 11.Nbd2 (11.dc5 Bc5 12.Nbd2 dc4=) 11...Bb7 (11...cd4 12.ed4 Bb7 13.Rc1=) 12.Rc1 Rad8 13.h3 Rfe8 14.Qb3 (14.cd5 Bd5 15.dc5 Bc5=) 14...e5 15.de5 Ne5 16.Ne5 Be5 17.Be5 Qe5 18.Nf3 Qh5 (18...Qe4 19.cd5 Qb4 20.Bc4=) 19.Rfd1= Qg6 20.cd5 (20.Bd3 Ne4=) 20...Bd5=+ 21.Qd3 Qd3 22.Rd3 Be4 (22...Bf3 23.gf3 Kf8=+) 23.Rd2 (23.Rd8 Rd8 24.Ne5 Kf8=) 23...Rd2 (better 23...Bf3!? 24.Rd8 Be2–/+ (24...Rd8?! 25.Bf3 Rd2 26.g4=)) 24.Nd2= Bf5 (24...Bd5 25.Nc4 Bc4 26.Bc4=) 25.Nc4+= Be6? (better 25...Rb8+=) 26.Nb6+– g6? (better 26...Rb8 27.Nc4 Bc4 28.Bc4 Nd7+–) 27.Rc5 Rd8 28.Nc4 Ne4 29.Rc7 Nc3 30.Bf1 (30.Bf3 Na4 31.Na5 Rd2+–) 30...Na4 31.Na5 Rb8 (31...Rd1 32.f4+–) 32.Nc6 Rb6 33.Nd4 Nc3 (33...Bd5+–) 34.Rc3 (34.Rc3 Bd5 35.Rc5+–) 1–0. BeepBeepImAJeep (2640) – rondep (2245), lichess.org, 2015.

7.a4 Be7 8.Qc2 Nb6 9.Na3 (9.cd5 Nbd5 10.d4 cd4 11.Bd4 Bd7=) 9...0–0 10.0–0–0 (10.Bd3 dc4 11.Nc4 Nc4 12.Bc4 b6=) 10...dc4 (10...Bd6 11.Bd3=+) 11.Nc4 Nbd5 12.d3 Nb4 13.Qd2 Nfd5 14.e4 (14.d4 Nb6 15.Nb6 Qb6=+) 14...Nb6=+ 15.Nb6 Qb6 16.Kb1 (16.d4 Qc7 17.Bc4 cd4 18.Qd4 Bf6=) 16...f6 (16...Rd8 17.Qf4=+) 17.e5 (17.d4 Bd7=+) 17...fe5 18.Ne5 Bf6 (18...Qd8 19.f4=+) 19.f4 (19.d4 Rd8 20.Nc4 Qc7–/+) 19...Qd6 20.Nc4 Qc7 (20...Qe7 21.g3=) 21.g3 Bb2 (21...Bd7 22.Bg2=) 22.Qb2 Rd8 (22...Nd5 23.Re1=) 23.Qe5+= Qe5 24.Ne5 Rd4 25.Rc1 b6 (25...Nd5 26.Rc5 Rb4 27.Kc1 Ra4 28.Bg2+=). Tabin – Olsommer, CH, 1975.

7.Qc2 b6 8.Be2 Qc7 9.d4 Bb7 10.0–0 Rc8 (10...cd4 11.ed4 dc4 12.Rc1= (worse 12.Bc4 Bf3 13.gf3 Qf4–/+)) 11.Nbd2 Be7 (11...cd4 12.Bd4 e5 13.Bc3=) 12.Rac1 (12.cd5 Bd5 13.e4 Bb7=) 12...Qb8 (12...0–0 13.g3=) 13.a4 (13.dc5 Nc5 14.cd5 Bd5+=) 13...0–0= 14.Qb3 Qa8 (14...h6 15.cd5 Bd5 16.Bc4=) 15.cd5 Bd5 16.Bc4 cd4 (16...Rfd8 17.Rfd1=) 17.Bd5 Nd5 18.Bd4 Bc5 19.Nc4 Bd4 20.Nd4 Nb4 21.Qa3 Qd5 (21...Rfd8!?=) 22.Nc6+– Nc6 23.Rfd1 Qc5? (better 23...Qh5 24.bc6 Nb8+–) 24.Rd7 (24.bc6?! Rc6 25.Qc5 Nc5 (25...Rc5? 26.Rd7 g5 27.Rd3+–) 26.Nb6 g6=) ½–½. Jernselius,Kjell (1895) – Fruebing,Thomas (2230), 7th Open Amateur Calvia, 2010.

7.Qc2 Bd6 8.Be2 0–0 9.d3 b6 10.Nbd2 Bb7 11.h3 Qc7 12.g4 (12.cd5 Nd5 13.Nc4 e5=) 12...Ne5+= 13.Rg1 Rfe8 14.Ne5 Be5 15.0–0–0 Bb2 16.Kb2 dc4 17.dc4 Qe5 18.Kc1 Rad8 19.g5 Ne4 20.f4 (20.Ne4!? Be4 21.Qb2 Rd1 22.Bd1–/+) 20...Qc3–/+ 21.Qc3 Nc3 22.Rde1 Na2 23.Kc2 Nb4 24.Kc3 Rd6 25.Rd1 Red8 26.h4 Nd3 27.Bf3? Nf2?? 28.Bb7+= Nd1 29.Rd1 Rd3 30.Kc2 Re3 31.Ne4 Rd1–+ 32.Kd1 Rd3 33.Kc2 Rd4 34.Kc3+= Kf8 35.h5 Ke7 36.Bc6 f5 37.gf6 gf6 38.f5 ef5 39.Ng3 Ke6 40.Bd5 Ke5 41.h6 Rh4 42.Ne2 Rh6 43.Nc1 Rh3 44.Kd2 a4 45.Nd3 Rd3! 46.Kd3 a3 47.Kc3 Kf4 48.Kb3?? Ke3 49.Ka3 f4 50.Kb3 f3 51.Kc3 h5 52.Be6 f2 53.Bh3 Ke2 0–1. Chirpii,A (1960) – Majboroda,E (2175), Yuzhny Open Yuzhny UKR, 2011.

7.Qc2 Bd6 8.Be2 b6 9.0–0 0–0 10.d3 Qc7 11.Nbd2 Bb7 12.a4 h6 13.g3 Rfe8 14.Rac1 Rad8 15.cd5 ed5 (worse is 15...Bd5 16.e4 Bb7 17.Nc4+/–) 16.Nd4 Rc8 17.Qb3 Bf8 18.Rc2 (18.Rfe1 Qd6 19.Nc6 Bc6 20.bc6 Qc6=) 18...Qe5 (18...Qd6 19.Nc6+=) 19.N2f3= Qd6 20.Nc6 Bc6 21.bc6 Qc6 22.Rb1 Rb8 23.Nd4 Qb7 24.Nf5 (24.Nf3 Bd6=) 24...Ne5 25.Qb5 d4 26.ed4 Nf3 27.Bf3 Qf3 28.Nh4 Qd5 (28...Qg4 29.Qc4+=) 29.Qc4 (29.Ng2 Ng4=) 29...Red8+= 30.Qd5 (30.Rd1 cd4 31.Qd5 Rd5–/+) 30...Nd5 31.Nf3 Nb4 32.Rd2 cd4 33.Bd4 b5 34.Ra1 g5 35.ab5 (35.Be5 Rb7 36.ab5 Rb5+=) 35...Rb5 36.h3 f5 37.Bc3 Rc5 Attacks the isolani on d3 (worse is 37...Nd3 38.Nd4 Ne5 39.Nb5 (39.Ba5?? Rd4 40.Rd4 Nf3 41.Kg2 Nd4–+) 39...Nf3 40.Kg2 Nd2 41.Ba5=) 38.Bb4 ab4 39.d4 Rcd5 40.Rad1 Bg7 (40...Bd6 41.Kg2+=) 41.Rb1 g4 42.hg4 (42.Ne1 Rd4 43.Rd4 Rd4 44.hg4 Rg4+=) 42...fg4 43.Ne1 Rd4 44.Rd4 Rd4 45.Nc2 Rd2 46.Nb4 Bd4 Attacking the backward pawn on f2 47.Rf1 Kg7 48.Nc6 Bc5 49.Ne5 h5 50.Nc4 Re2 51.Na5 Kf6 52.Nb7 Bb6 53.Nd6 Ke6 54.Nb5 Rc2 55.Kg2 Kd5 56.Rd1 Ke5 57.Re1 Kf6 58.Rf1 Bc5 59.Nc7 Kf5 60.Nd5 Bd4 61.Ne7 Kg5 62.Nd5 Ba7 63.Nf4 Be3 64.Nd5 Ba7 65.Nf4 h4 (65...Ra2 66.Ne6 Kf5 67.Ng7 Kg6 68.Ne6+=) 66.Nh3= gh3 67.Kh3 Rc3 68.f3 hg3 69.Kg3 Bb8 70.Kf2 Kf4 71.Ke2 Be5 72.Rf2 Rc2 73.Kf1 Rc3 74.Ke2 Bf6 75.Rf1 Re3 ½–½. housemd (1990) – calabuig (2055), gameknot.com, 2015.

7.Nc3 Nb6 8.Rc1 Nc4 9.Bc4 dc4 10.Ne5 =.

7.Nc3 Nb6 8.Rc1 Bd7 9.Ne5 Rc8 (9...Bd6 10.Nd7 Nbd7 11.cd5 ed5 12.Qf3=) 10.Na4 (10.Nd7 Qd7 11.Na4 Na4 (11...Nc4? 12.Bf6 Qb5 13.Bc3+–) 12.Qa4 b6+=) 10...Nc4= 11.Nc4 dc4 12.Bc4 Bd6 13.Ba3 (13.Qf3 Rb8=) 13...Be7 (13...Qc7 14.d3=) 14.0–0+= 0–0 15.Qf3 Nd5 16.Rfd1 Nb4 (16...b6 17.Bb2+=) 17.d4+/– cd4 18.Rd4 Bf6 19.Rd2 Qe8 20.Nb6 Rd8 21.Qh5 (21.Qb7?! Bb5 22.Rd8 Bd8=) 21...Bc8 (21...Qe7 22.Bb4 ab4 23.Nd7 Rd7 24.Rd7 Qd7 25.Rd1+=) 22.Qd1 Rd2 23.Qd2 Qd8 24.Qd8 Rd8 25.Bf1 (25.Be2 Bd7 26.Rc7 Be8 27.Bb4 ab4+/–) 25...Bd7+/– 26.Rc7 Be8 27.Bb4 ab4 28.Rb7 Kf8 (28...Rd1 29.Nc4+/–) 29.g3+/– Rd1 30.Kg2 Rd2 31.Ra7 Rc2 ( 31...Rd1+/–) 32.Nc4?? ( 32.a4+–) 32...Bb5–/+ 33.Ra8 Ke7 ½–½. Van Rooijen,Peter – Hermans,Marcel M, UECC CUP–A email, 2000.

7.Nc3 Nb6 8.cd5 Nbd5 9.Be2 Be7 10.0–0 0–0 11.d4 b6 12.Ne5 Bb7 13.Nc6 Qc7 (13...Bc6 14.bc6 Rc8 15.Nd5 ed5 16.dc5 bc5 17.Bb5+=) 14.Ne7 Qe7 15.Nd5 Nd5 16.dc5 bc5 17.Bf3 Rfd8 18.Qc2 Rac8 19.Qc4 Rd7 (19...Qg5 20.Rad1+=) 20.a4 (20.e4 Nb6 21.Qc3 f5+=) 20...Nb4 (20...e5 21.Rfd1 Nb6 22.Rd7 Qd7 23.Qg4=) 21.Bb7 Rb7 22.Rad1 Rd7 23.Qg4 f5 24.Rd7 Qd7 25.Rd1 Nd5 26.Qc4 Qc7 27.g3 Kf7 28.e4 Nb6 29.Qc3 Kf8 30.Qc2+/– Kg8 31.ef5 ef5 32.Qf5 Rf8 33.Qc2 Qf7 34.f4 Qe7 35.Be5 Rc8 36.Rd6+– Nd7 37.Qf5 Rd8 38.Qd3 (38...Qf7 39.Qd2+–) 1–0. Secula,V – Blauhut,H, corr SOK–89–49, 1989.

7.Nc3 Bd6 8.Be2 0–0 9.0–0 Nb6 10.d3 a4 11.a3 Qe7 12.Qc2 Re8 13.h3 h6 14.Rfe1 Qc7 15.Bf1 e5 16.cd5 Nbd5 17.Na4 Bd7 18.Rec1 b6 19.Qb3 Be6 20.Qc2 Bd7 21.Qb3 Be6 22.Qc2 Bd7 ½–½. Korchut,Adam (1810) – Kroes,Friso (1910), SA–2010–0–00170, 2010.

7.d3 b6 8.Be2 (8.Nc3 Bd6=) 8...Bb7 (8...Bd6 9.0–0=) 9.0–0 dc4 10.dc4 Qc7 11.Nbd2 Bd6 12.h3 (12.Qc2 Rd8=) 12...0–0 13.Qc2 Rfd8 14.a4 e5 15.Ng5 h6 (15...Ra7 16.Rad1=) 16.Nge4 Ne4 17.Ne4 Rab8 (17...Be7 18.Rad1=) 18.Nd6+= Qd6 19.Rad1 Qe7 20.Bg4 (20.Qf5 f6+=) 20...Nf6 21.Qf5 (21.Bf5 g6 22.Bd3 Rd6+=) 21...Ng4= 22.Qg4 f6 23.Qe2 e4 24.Rd8 Rd8 25.Rd1 Rd1 26.Qd1 Kh7 27.Qg4 Qd6 28.Qe2? ( 28.Kh1=) 28...Qd3–/+ 29.Qg4? Qb1–+ 30.Kh2 Qb2 31.Qd7 Qe5 32.g3 Qb8 33.h4 Bc8 34.Qe8 Qb7 35.h5 Bf5 36.Qd8 Qf7 37.Qd1 Qc4 38.g4 Qd3 39.Qg1 Bd7 40.Qg3 Qd1 41.g5 Qh5 (42.Kg1 Qg5 43.Qg5 fg5–+) 0–1. Oesterberg – Seack,Ingo, corr 3GMM–12, 1996.

7.d3 Bd6 8.Be2 0–0 9.Nbd2 Qc7 10.Rc1 b6 11.0–0 Bb7 12.d4 e5 13.de5 Ne5 14.Qc2 Rfe8 15.Rfd1 d4 16.ed4 Neg4 17.Nf1 Be4 18.Bd3 Bf3 19.gf3 Nh2 (19...Bh2? 20.Kg2+–) 20.Nh2 Bh2 21.Kg2 Bf4 22.dc5 Qc5 23.Bf6 Bc1 24.Bh7 Kf8 25.Qc1 gf6 26.Qh6 Ke7 27.Rd5?? (27.Qf4 Qg5 28.Qg5 fg5 29.f4 gf4 30.Be4–/+) 27...Qb4 ( 27...Rg8 28.Kf1 Qc4 29.Rd3 Rg5–+ (29...Qb5?! 30.Qe3 Kf8 31.Bg8 Kg8 32.Qd4=+)) 28.Qe3+– Kf8 29.Qb6 Re6 30.Qc7 Rae8? 31.Bf5 Re5 32.Rd7 R5e7 33.b6 Rd7 34.Bd7 Re2 35.c5 (35...Qh4 36.Qb8 Kg7 37.Qg3 Qg3 38.Kg3 Ra2 39.c6+–; 35.b7 Rb2 36.Qc8 Kg7+–) 1–0. Mauersberger,Hermann – Kindsvogel,Robert, corr, 1998.

7.d3 Be7 (7...Bd6 8.Be2=) 8.Nbd2 0–0 (8...Bd6 9.Be2=) 9.Be2 b6 10.0–0 Bb7 11.Qc2 Rc8 (11...Bd6 12.a4=) 12.Rfd1 (12.cd5 Nd5 13.Nc4 Bf6=) 12...Qc7 13.Rac1 Qb8 (13...dc4 14.Nc4 Rfd8 15.Nfe5+=) 14.Qb1 (14.Re1 dc4 15.Nc4 Ng4=) 14...dc4 (14...Qd6 15.Qa1=) 15.Nc4 (15.dc4 Rfd8=) 15...Ng4 16.h3 (16.e4 Qf4=) 16...Bf3 17.Bf3 (17.gf3?? Qh2 18.Kf1 Qf2) 17...Qh2 18.Kf1 Nge5 19.Be5 Ne5 20.Nb6 (20.Ne5 Qe5 21.d4 Qh2=) 20...Nf3 (20...Rb8 21.Na4 Nf3 22.gf3=) 21.gf3= (21.Nc8? Bh4 22.Ne7 Kh8–+) 21...Bh4 Threatening mate: Qxf2 22.Qc2 Rc7 23.Nc4 f5 (23...Rd8 24.b6 Rb7 25.Rb1 Qh3 26.Ke1=) 24.b6 (24.f4 Qh3 25.Ke1 a4+=) 24...Rcf7 (24...Rb7 25.a3=) 25.Rb1 (25.f4!?+=) 25...Rf6=+ 26.Ke1 (26.b7 Rg6 27.d4 cd4–/+) 26...Rg6 (26...f4 27.e4 Qg1 28.Kd2 Qf2 29.Kc1 Qf3 30.b7=) 27.Kd2 (27.Na5?? Rg2 28.Rb2 Rf2 29.Qf2 Qg1 (29...Bf2?! 30.Rf2 Qh3 31.Nc4=) 30.Kd2 Qf2 31.Kc1 Qe3 32.Kc2 Qf2 33.Rd2 Qf3–+) 27...Rg2 28.Kc1 Rf2 Threatening mate... how? 29.Rd2 (29.Nd2 Qe5 (worse 29...Qh3 30.b7 Qg3 31.Qc5+–) 30.b7 Rb8=+) 29...Qh1 (29...Qg1 30.Kb2 Bf6 31.d4=+) 30.Kb2=+ Bf6 (30...Qf3? 31.Rf2 Qf2 32.Qf2 Bf2 33.b7+–) 31.Ka3 Rd2 32.Nd2 (32.Rh1?? Rc2 33.Rb1 Rb8–+) 32...Qh2 (worse 32...Qh3 33.Qc5 Qh2 34.b7 Qd2 35.b8Q Rb8 36.Rb8 Kf7 37.Qf8 Kg6 38.Qe8 Kg5 39.Qe6 Qd3 40.Rb3+=) 33.b7 Be5 (better 33...Kf7!?=+) 34.Qc4 (better 34.Rb6 f4 35.Qc4 fe3 36.Qe6 Kh8 37.Nc4+–) 34...Kf7?? (34...Re8 35.Nb3 (35.Qc5?? Bd6 36.Nb3 Rb8–+) 35...Qe2 36.Nc5 (36.Qc5?! Bb8+=) 36...Qe3 37.Rb6+– (37.Ne6?! Bd6 38.Nc5 Kh8+–)) 35.Nb3?? (better 35.Rb6!? Re8 36.f4 Bd6+–) 35...Bb8 (35...Bd6!?+–) 36.Nc5+– Do you see the mate threat? 36...Qd6 (36...Re8 37.Rb6 Qe5 38.e4+–) 37.d4 (37.Qd4 Qd4 38.ed4 Rd8+–) 37...Ba7 (37...Rd8 38.Qa6 Qd5 39.e4 Qd4 40.Qe6 Kf8 41.Rb5 Qc3 42.Nb3+–) 38.Qb5 Rb8? (better 38...Rd8+–) 39.Qd7 Qe7 40.Qe7 (40.Qe7 Ke7 41.Ka4+–) 1–0. Kreuzer – Warkentin, 1982.

7.d4 Qc7 8.Nbd2 (8.cd5 Nd5 9.Nc3 c4 10.e4 Nc3 11.Bc3 Nb6 12.Ne5+= 0.38) 8...b6 (8...cd4 9.Bd4 (9.Nd4 e5 10.N4f3 e4 11.Nd4 Nc5 12.cd5+= 0.38) 9...e5 10.Bb2 e4 11.Nd4 Nc5 12.cd5+= 0.41) 9.Rc1 (9.dc5 Qc5 10.cd5 Qd5 11.a3 Bb7 12.Rc1= 0.09) 9...Bb7 (9...Bd6 10.dc5 bc5 11.Bd3 0–0 12.cd5+= 0.28) 10.Be2 (10.Bd3 cd4 (10...Bd6= 11.cd5 ed5 12.dc5+= 0.34) 11.Bd4 Ba3 12.Rc2+= 0.28; 10.cd5 Bd5 11.Bc4 Be7 12.dc5+= 0.31) 10...Bd6= 11.h3 (11.cd5 ed5 12.dc5= 0.19) 11...Rc8 (11...0–0 12.cd5= 0.03 (12.0–0=)) 12.0–0 0–0 13.Re1 Rfe8 (13...Rfd8 14.Bd3=) 14.Qb3 ½–½. Borrmann,Fritz – Kompe,Joerg (1620), Leutersdorf Sparkasse op, 2006.

7.cd5 ed5 8.Be2 b6 9.0–0 Bd6 (9...Be7 10.d4=) 10.a4 (10.Nc3 0–0=) 10...Bb7 (10...0–0 11.Nc3=) 11.d4 c4 12.Nc3 Rc8 13.Qc2 0–0 14.Ba3 (14.Rac1 Qe7=) 14...Ba3 (14...Bb4 15.Bb2=) 15.Ra3 Qe7 16.Raa1 Rfe8 17.Nd2 Nf8 18.Bf3 Ng6 19.g3 Ne4 (19...Qd6 20.Rac1=) 20.Nde4 (20.Nce4 de4 21.Be2 Bd5+=) 20...de4= 21.Bg2 (21.Bg4 Rcd8=) 21...Qe6 22.Rfd1 f5 23.Rac1 Ne7 24.Qa2 Nd5=+ 25.Bf1 Nb4 26.Qd2 Nd3–/+ 27.Rb1 Qd6 28.Qa2 Kh8 29.Bh3 Qg6 30.Qe2 Rcd8 31.Bg2=+ Qh6 32.Qa2 Rc8 33.Qd2 g5 34.Ne2 Qg7 35.h3 h5 36.Kh2 Rf8 37.Rf1 f4 38.ef4 gf4–/+ 39.gf4?? e3!–+ (40.Bb7 ed2 41.Bc8 Rc8–+) 0–1. Junge – Linert,Heinrich (2520), corr FD'81 JBDDR'5, 1981.

7.cd5 ed5 8.Be2 Bd6 9.0–0 =.

7.cd5 ed5 8.Be2 Be7 9.0–0 0–0 10.d4 b6 (10...c4 11.Qc2=) 11.Nc3 Bb7 12.Rc1 Bd6 13.Bd3 Re8 14.Bc2 Rc8 15.Bb3 (15.dc5 bc5 16.Bf5 Qe7=) 15...h6 Black prepares the advance c4 (15...c4 16.Bc2+=) 16.Kh1 (16.dc5 Nc5 17.Bc2= (17.Bd5? Nd5 18.Nd5 Bd5–+)) 16...c4+= 17.Bc2 Ne4 18.Be4 de4 19.Nd2 Qe7 20.Qe2 Qe6 21.Rc2 Rc7 22.Rfc1 Rec8 23.h3 f5 24.Na4 Now all is on c4 24...Bd5 25.Nc3 Bb7 26.Re1 Nf6+= 27.Nf1 Be7 28.Na4 Bd5 29.a3 Nd7 30.Rc3 g5 31.Ba1 f4 32.Qg4 Qg6 33.ef4= Nf6 34.Qe2 gf4 35.f3 Nh5?? 36.fe4+/– Ng3?? 37.Rg3 fg3 1–0. Quehl,Thomas (1945) – Geisler,Re (1955), 8th Lippe Cup, 2011.

7.Be2 b6 8.0–0 Bb7?! 9.d3 Qc7 10.Qc2 (10.Nbd2 Ng4? 11.h3 h5 12.cd5 ed5 13.d4 Ngf6 14.Ne5 Ne5 15.de5 Nh7? 16.f4! +–. Rosiak – Pioch, Gdansk 1968 (P)) 10...Bd6 11.Nbd2 0–0–0? 12.Rac1 g5? 13.cd5 ed5 14.Bf6 Nf6 15.d4 Kb8 16.dc5 Bc5 17.Nd4 h5 18.N2b3 Ng4 19.Nf3 Bd6 20.Qc7 Bc7 21.Nfd4 +–. Rosiak – Pioch, Gdansk 1968 (P).

7.Be2 b6 8.Nc3 Bb7 9.0–0 Bd6 10.d4 dc4 11.Bc4 0–0 12.d5 ed5 13.Nd5 Bd5 14.Bd5 Nd5 15.Qd5 Nf6 16.Qf5 Qc8 17.Qg5 Qe6 (17...h6 18.Qh4 Ne8 19.a4+=) 18.Bf6 Qf6 19.Qf6 gf6 20.Nd2 Rfd8 21.Nc4 Bc7 22.Rfd1 Kf8 23.Kf1 Ke7 24.Ke2 Ke6 25.e4 (25.g3!?+/–) 25...f5= 26.f3 (26.ef5 Kf5 27.Kf3 Rd4 (27...Bh2? 28.g3+–) 28.Rd4 cd4+=) 26...f4 (better is 26...fe4!? 27.fe4 Bh2+=) 27.a4+= Rg8 28.Kf2 Rg5 29.g4?? (better is 29.Rd2+/–) 29...fg3–/+ 30.hg3 Bg3 31.Ke3 Bc7 32.Rh1 h5 33.Rad1 Rh8 34.Rh3 Rg2 35.Rdh1 Rd8 ½–½. Matveenko,Yury (2180) – Tkachenko,Victor (2215), Voronezh–ch Voronezh, 2007. (=1.Nf3 Nf6 2.b4 a5 3.b5 c5 4.c4 e6 5.Bb2 d5 6.e3 Nbd7)

7.Be2 Nb6 8.Qc2 dc4 (8...Nc4 9.Bc4 dc4 10.Na3=) 9.Bc4 (9.Na3 Bd6=) 9...Nc4 10.Qc4 b6 11.d4 (11.Nc3 Bb7=) 11...Bb7=+ 12.Nbd2 Rc8 13.Qe2 Nd5 (13...Bf3 14.Nf3 c4 15.Rc1 Bb4 16.Bc3=+) 14.a3 (14.0–0 cd4 15.Nd4 Bd6=) 14...cd4=+ 15.Bd4 f6 16.0–0 e5 17.Ne5 (17.e4 Nf4 (worse 17...ed4 18.ed5 Qe7 19.Ne4+=) 18.Qe3 Qd6–/+ (18...ed4?! 19.Qf4 Bd6 20.Qg4=)) 17...fe5–/+ 18.Qh5 Kd7 19.Qf5 Ke8 20.Qh5 Kd7 (20...Ke7 21.Qe5 Kf7 22.Rfc1=+) 21.Be5 (21.Qf5 Ke7 22.Qe5 Kf7 23.Rfc1=+) 21...Nf6 (21...Qe8!? 22.Qg4 Qe6–/+) 22.Qf5=+ Ke8 23.Rfd1 (better 23.Qe6!? Qe7 24.Qb6=) 23...Qd7–/+ 24.Qb1 (24.Qd7 Nd7 25.Bd4 Rg8–/+) 24...Qg4 (24...Qd5 25.Nf3 Qe6 26.Bf6 Bf3 27.gf3 gf6 28.Qd3–+) 25.f3–/+ Qg6 (25...Qg5 26.Bf4 Qh5 27.Qd3–/+) 26.e4 (26.Qg6 hg6 27.Bd4 Nd7=+) 26...Bc5–/+ 27.Kh1 Ke7 (27...Rf8 28.Qb3 Qf7 29.Nc4=+) 28.Nc4 (28.Nb3 Rhe8=+) 28...Rhd8–/+ 29.Qb2 Qf7 30.Rac1?? (better 30.Rd8 Rd8 31.Qc3–/+) 30...Rd1–+ 31.Rd1 Qc4 32.Qd2 Qb5 33.Bd6 (33.Qg5 Kf7 34.Bf6 gf6–+) 33...Ke8 34.e5 (34.Bc5 Qc5 35.Qd3 Qf2–+) 34...Bd6 (34...Nd5 35.Qg5 Qe2 36.Rb1–+) 35.Qd6 (35.ed6 Kf7–+) 35...Qd7 36.Kg1 (36.h3 Qd6 37.Rd6 Nd5–+) 36...Qd6 37.Rd6 Nd5 38.g3 (38.Re6 Kd7 39.Rd6 Ke7–+) 38...Ke7 39.f4 Rc3 40.f5 Ra3 41.Re6 (41.g4 Rf3 42.Re6 Kd7–+) 41...Kf7 (41...Kd7 42.g4–+) 42.Rd6 Ra1 43.Kf2 Ra2 44.Kg1 (44.Ke1 Ke7 45.Re6 Kd7–+) 44...Ke7 45.Re6 Kf8 46.Rd6 (46.f6 gf6 47.ef6–+) 46...Ne3 47.Rd8 Ke7 48.Rb8 Rg2 49.Kh1 Bf3 50.f6 Kf7 (50...Ke6 51.Rb6 Kf5 52.h3 Rg3 53.Kh2 Nf1) 51.e6 Kg6 52.h4 Rg3 53.Kh2 Nf1 0–1. Karacsony,Zsolt (2075) – Szabo,Szilard, HUN–ch univ Hungary, 2000.

7.Be2 Nb6 8.Qc2 Bd6 9.0–0 0–0 10.d4 Qe7 11.Nbd2 Nfd7 12.Rac1 Re8 13.Bd3 h6 14.Ne5 (14.Ba3 dc4 15.Nc4 Nc4 16.Qc4 Nb6+=) 14...Qf8 (14...cd4 A) worse is 15.Bd4 Be5 (15...Ne5?! 16.Bb6 Nd3 17.Qd3=) 16.c5 Nc4–/+; B) 15.ed4 dc4 16.Ndc4 Nc4 17.Qc4+=) 15.f4 Be7? (15...Qe7 16.e4 cd4 17.Bd4 Ne5 18.Bb6+=) 16.Rf3 (16.Bh7 Kh8 17.Bg6 Ne5 18.fe5 Bg5 19.Rf7 Be3 20.Kh1 Qg8+/–) 16...Rd8 17.Bh7 Kh8 18.Bg6! Ne5 19.fe5 f5 20.ef6! gf6 21.dc5 Nc4 22.Nc4 dc4 23.Rcf1 Kg7 24.Bh5 Rd3 25.Qc4 Rd2 26.Qg4 Kh8 27.Rf6 (27.Rf6 Qf6 28.Rf6 Rd1 29.Rf1 Rd4 30.Qd4 e5 31.Qe5 Bf6 32.Qf6 Kg8 33.Qf7#) 1–0. Fischbach,Rainer (1660) – Meisel,Dirk (1855), Leipzig VfB op, 2004.

7.Be2 Nb6 8.cd5 ed5 9.0–0 Be7 10.Qc2 Bg4 11.d3 0–0 12.Nbd2 h6 (12...Re8 13.Be5=) 13.a4 Nbd7 14.e4 Nh5 (14...d4 15.h3 Be6 16.Rae1=) 15.Rfe1 Nf4 16.Bd1 White intends e5 (16.ed5 Nd5 17.d4 Rc8=) 16...Bf6 17.d4 Rc8 18.e5 cd4 (18...Bg5 19.Rc1=) 19.Qb1 Be7 20.Bd4 (20.Nd4 Bd1 21.Qf5 Bh5–+) 20...Bb4 21.Re3 Re8 22.h3 (22.Qb2 Qe7+=) 22...Bd2 23.Nd2 Bd1 24.Qd1 Ne6 25.Nf3 Rc4 26.Bb2 Ndc5 27.Nd2 Rf4 28.Rf3 Rf3 29.Nf3 Ne4 30.Rc1 Qb6 31.Rc2 N6c5? 32.Bd4 Qc7 33.Bc5 Nc5 34.Qd5 b6 35.Qc4 Qe7 36.Rd2 Qe6 37.Qe6 Re6 38.Rd4 Nb3 39.Rd8 Kh7 40.Rd6 Nc5 41.Rd4 ½–½. Lippmann,Ulrich (2060) – Bodenstein,Joachim (2005), Niedersachsen–ch Seniors, 2004.

7.Be2 dc4 8.0–0 Nb6 =.

7.Be2 dc4 8.Na3 =.

7.Be2 dc4 8.a4 Nb6 9.Na3 Be7 (9...c3 10.Bc3 Nfd5 11.Bb2=) 10.Ne5 (10.Nc4 0–0=) 10...0–0 (10...c3 11.Bc3 Nfd5 12.Nac4 Nc3 13.dc3 Qd1 14.Bd1 Nc4 15.Nc4+=) 11.Nac4 Nc4 12.Nc4 Nd7 (12...Nd5 13.0–0=) 13.0–0+= Bf6 14.d4 cd4 15.ed4 Nb6 (15...Be7 16.d5+=) 16.Ba3 Re8 (16...Nc4 17.Bf8 (< 17.Bc4 Qd4 18.Bf8 Qa1 19.Qa1 Ba1=) 17...Nb2 18.Qc2 Kf8 19.Qb2 Bd4 20.Rad1+/–) 17.Nd6+/– Re7 (17...Rf8 18.Nc8 Rc8 19.Bf8 Kf8 20.Bf3+/–) 18.Nc8 Rc8 19.Be7 Qe7 20.Qd2 Qb4 21.Qb4 ab4 22.Rab1 Be7 23.a5 Na4 24.Bf3 Rb8 25.a6 ba6 26.ba6 (26...Nb6 27.a7+–) 1–0. Zschalich,Arndt – Helbig, corr, 1984.

7.Be2 Qc7 8.0–0 Bd6 9.d3 (9.d4 b6=) 9...0–0= 10.Nbd2 b6 (10...a4 11.Rc1=) 11.Qa4 Bb7 12.Rac1 h6 13.cd5 ed5 14.h3 Rfe8 (14...Qd8 15.Nh4=) 15.Rfe1 (15.Nd4 g6=) 15...Rac8 16.Nh4 (16.Nd4 g6=) 16...g6 17.Nhf3 Bf8 (17...Qb8 18.Nb3=) 18.Qb3 Qd6 19.a4 (19.Qa4 Bg7=) 19...Qe6+= 20.Qa2 Bg7 (20...Bd6 21.Qb3+=) 21.Bd1= Qd6 (21...Nh5 22.Bg7 Kg7 23.Qb2 Qf6 24.Qa3=) 22.Bb3 (22.Qa1 Rcd8=) 22...Nh5 23.Ba3 Red8 (23...Bh8 24.Rc2=) 24.Qb1 Kh7 25.Nd4 (25.d4 Nhf6=) 25...Nhf6 (25...Re8 26.N4f3=) 26.Ne2 Kg8 27.Nf4 g5 (27...Re8 28.Nf3=) 28.Ne2 g4 (28...Qe6 29.Ng3+=) 29.h4 Nh5 30.d4 g3 31.Qf5 gf2 32.Qf2 Qf6 33.Nf3 Bf8 (33...Qd6 34.dc5 Nc5 35.Nfd4+=) 34.Ng3+= Ng3 35.Qg3 Qg7 (35...Qg6 36.Qg6 fg6 37.Bc2+=) 36.Qh3 Rc7 37.Bc2 c4 (37...Bd6 38.Bf5 Qg3 39.Re2 Qh3 40.Bh3+=) 38.Bf8 Nf8 39.Bf5 f6 (39...Bc8 40.Bc8 Rdc8 41.Ne5+/–) 40.Nd2 (40.h5 Re7+=) 40...Kh8 41.Rf1 Ng6 (41...h5 42.Rf3+=) 42.Qg3+/– Nf8 43.Qf2 Re7 44.Bh3 Bc8 45.Bc8 Rc8 46.Qf5 (46.Qf6?! Re3 47.Rf5 Qf6 48.Rf6 Re6+=) 46...Rd8 47.Qf6 Ne6 48.Qg7 Kg7 49.Nf3 Rd6 50.Ne5 Rb7 (50...Nf8 51.e4! Nd7 52.Rf5 de4 53.Rc4+/–) 51.Rf3 Re7 (51...Nd8!?+/–) 52.Rcf1+– Nd8 53.R1f2 Kh7 (53...Rc7 54.Kf1+–) 54.Kf1 Ree6 1–0. bla_ner (1935) – calabuig (2075), gameknot.com, 2015.

7.Be2 Bd6 8.0–0 =.

7.Be2 Bd6 8.Qc2 0–0 9.0–0 b6 10.a4 Bb7 11.d4 (11.cd5 Nd5 12.Na3 Be7=) 11...Rc8=+ 12.Nbd2 Qe7 (12...cd4 13.Nd4 dc4 14.Nc4=+) 13.Bd3 (13.Rfd1 cd4 14.Nd4 Rfd8=+) 13...cd4=+ 14.ed4 (14.Nd4 Ne5=+) 14...dc4–/+ 15.Bc4 Nd5 16.g3 (16.Rac1 Rfd8=+) 16...Nb4 (16...Rfd8 17.Rac1–/+) 17.Qb3 Rc7 18.Rfe1 Rfc8 19.Be6 (19.Rac1 Bd5–/+) 19...fe6 (19...Nc2!? 20.Bh3 Qd8–/+) 20.Re6=+ Qf7?? (20...Bd5 21.Re7 Bb3 22.Rd7 Rd7 23.Nb3 Nd3–/+) 21.Ng5= Bd5 22.Qd5 Nd5 23.Nf7 Kf7 (better 23...Bb4 24.Nd6 Bd2 25.Nc8 Rc8+=) 24.Rd6+– N7f6 25.Nf3 Rc2 26.Ne5 (26.Ne5 Kg8 27.Ba3+–) 1–0. GuestWTJX – GuestYPKM, freechess.org, 2019.

7.Be2 Bd6 8.d4 cd4 9.Qd4 e5 10.Qd1 a4 (10...e4 11.Nfd2=) 11.a3 (11.0–0 0–0=) 11...e4 12.Nfd2 Nc5 13.cd5 Nd5 (13...0–0 14.Nc4 Bf5 15.Nc3 Nd3 16.Bd3 ed3 17.g4 Ng4 18.Qf3=) 14.Bg7 (14.Nc4 Be7 15.Qd4 Nf6 16.Qd8 Bd8=) 14...Rg8= 15.Bd4 Bf5 (15...Qe7 16.g3=) 16.g3+= Rc8 (16...Bf8 17.0–0+/–) 17.Nc4 (17.0–0 Be7+/–) 17...Nb3= 18.0–0 (18.Ra2 Be7=) 18...Be7 (18...Bb8 19.Bb2=) 19.Ra2 Nf4 20.ef4 Qd4 (worse is 20...Nd4 21.Rd2 Ne2 22.Qe2+/–) 21.Ne3 (21.Nbd2 Be6=) 21...Bh3 22.Rc2 Rc2 23.Qc2 Bf1 24.Bf1 Rg6 (24...Nc5!?=) 25.Qc8+/– Qd8 26.Qb7 Nc5 27.Qa7 Qb6 28.Qa8 Qd8 29.Qd8 Bd8 (29...Kd8 30.Bc4+/–) 30.Nc4+/– Kf8 31.Nc3 Bf6 32.Nd5 Bd4 33.Bh3 Rh6 34.Bg4 Nd3 35.Nde3 Rf6 (35...Nf2 36.Kf2 Rh2 37.Ke1 Be3 38.Ne3+/–) 36.Bd7+/– Be3 37.fe3 Nc5 38.Bc6 Ke7 39.g4 Rg6 40.h3 Rg8 41.Kf2 f6 42.Kg3 (42.Nd2 h5+/–) 42...Rd8+= 43.Kh4 Rd1 44.b6 Rc1 45.Nd2 Kd8 46.Ne4 (46.Bb5 Rc3 47.Nc4 Nd7+=) 46...Ne4 47.Be4 h6 48.Kh5 Rc3 49.h4 (49.Kh6 Re3 50.Bc6 Rh3 (50...Ra3 51.h4 Rh3 52.h5+/–) 51.Kg6 Ra3 52.Kf6 Rb3 53.Ba4 Rb4=) 49...Re3 (49...Ra3 50.Bc6 Ra1= (50...Re3 51.Ba4 Re4 52.b7+–)) 50.Bc6+/– Ra3 51.Kh6 Rh3 52.h5 a3 53.Bd5 Rd3 54.Bg8 Rd2? (better is 54...Kd7!?+/–) 55.Kg6+– Rd4?? (55...Rg2 56.Kf5 a2 57.Ba2 Kd7 58.Be6 Kc6+–) 56.h6 Rf4 57.Be6 a2 58.Ba2 Rg4 59.Kf6 Rh4 60.Kg5 Rh1 61.Be6 Ke7 (61...Rh2 62.Bf5 Rg2 63.Kf6+–) 62.b7 Rb1 63.h7 Ke6 64.h8Q Rb7 65.Qh6 Kd7 66.Qa6 (66.Qh7 Kc6 67.Qe4 Kc7+–) 66...Kc7 (66...Rc7 67.Qd3 Ke6 68.Qe4 Kd6 69.Kf6+–) 67.Qc4 Kb6 (67...Kd8 68.Kf5+–) 68.Kf6 Ka5 69.Qa2 Kb6 70.Ke6 Rc7 71.Qb3 Ka5 72.Kd6 Rc8 73.Qh3 Rc4 74.Qf5 (74.Qa3 Kb5 75.Qb3 Rb4 76.Qd5 Ka4+–) 74...Kb4 75.Qb1 Kc3 76.Qe1 Kb3 (76...Kc2 77.Qe3+–) 77.Kd5 Rc8 (77...Rc7 78.Qb1 Ka4 79.Qb6+–) 78.Qe6 (78.Qb1 Ka4+–) 78...Rc4 (78...Rc2 79.Qb6 Kc3 80.Qd4 Kb3 81.Qd3 Rc3 82.Qb5 Kc2 83.Kd4+–) 79.Qb6 Rb4 80.Qe3 Ka4 81.Qe2 (81.Qd3 Rb8 82.Qc2 Ka3 83.Qc1 Ka2 84.Qc4 Ka3 85.Qc3 Ka2 86.Qa5 Kb3+–) 81...Ka3 (81...Rb5 82.Kc6 Rb3 83.Qc4 Ka3 84.Kc5+–) 82.Kc5 Rb3 83.Qe1 Rb2 84.Kc4 (84.Kc4 Rc2 85.Kd3+–) 1–0. yzerman123 (2380) – housemd (2030), gameknot.com, 2015.

7.Be2 Bd6 8.h3 0–0=.

7.Be2 Be7 8.0–0 0–0 9.d4 b6 10.cd5 Nd5 11.Nbd2 Bb7 12.Rc1 Rc8 13.Nc4 Qc7 14.Nfe5 Ne5 15.de5 Rcd8 16.Qb3 f5 17.Rcd1 h6 18.Rd2 Nb4 19.Rfd1 Rd2 20.Rd2 Rd8 21.Rd8 Bd8 22.a3 Nd5 23.Nd6 Be7 24.Nb7 Qb7 25.Qd3 Qc7 26.g3 Bf8 27.e4 c4 28.Qc2 fe4 29.Bc4 e3 30.fe3 Kh8 31.Qe4 Qc5 32.Bd5 ed5 33.Qd3 Qc4 34.Qc4 dc4 35.Kf2 1–0. Muri,Heinrich (2375) – Peschardt,Soeren (2430), Swiss Friends white, 2007.

7.Be2 Be7 8.0–0 0–0 9.d4 Nb6 (9...a4 10.Nc3 a3 11.Bc1=) 10.Nbd2 a4 (10...Bd7 11.dc5 Bc5 12.Nb3=) 11.a3 (11.dc5 Bc5 12.Rc1 dc4 13.Nc4 Nbd5+=) 11...Bd7 (11...Qd6 12.Rc1+=) 12.Ne5 (12.cd5 Nfd5 13.dc5 Bc5+=) 12...dc4= 13.dc5 Bc5 14.Nd7 Qd7 15.Bf6 gf6 16.Bc4 Nc4 17.Qg4 Kh8 18.Nc4 Rg8 (18...Qb5 19.Rab1 Qc6 20.Rfd1=) 19.Qf3+= Rg6 20.Rab1 Qd5 21.Qd5 ed5 22.Nb2 Ba3 23.Rfd1 Rg4 24.Nd3 Bd6 25.f4 a3=+ 26.Nf2 Rgg8 27.Rd5 a2 28.Ra1 Bb4 29.Ne4 Rge8 30.Rd4 Re4 31.Re4 Bc3 32.Ra2 Ra2 33.Re7 Bd2 34.Rb7 Be3 35.Kf1 Kg7 36.Rd7 Rb2 37.Rd5? Bf4 38.g3 Be5 39.Kg1 Kf8 40.Rd8 Ke7 41.Rh8 Rb5 42.Rh7 Rb2 43.Rh4 f5 44.Rc4 f6 45.Rh4 Ke6 46.Rh3 Bd4 47.Kf1 Be3 48.Rh8 Kd5 49.Rh4 Bg5 (50.Rh8 f4–+) 0–1. Bodin,Stefan – Eriksson,Bo (2335), Kristallen KM, 1994.

7.Be2 Be7 8.0–0 0–0 9.d4 Qc7 10.Nbd2 b6 11.Rc1 Bb7 12.Qc2 Rac8 13.Rfd1 Rfd8 14.Qb1 Qb8 15.Bf1 (15.dc5 Nc5 (worse is 15...Rc5 16.Ba3+/–) 16.Kf1 Ncd7=) 15...h6 16.dc5 Bc5 (16...Rc5 Less advisable is 17.Ba3 Rb5 18.cb5 Ba3 19.Rc2+/–; 16...Nc5?! 17.Ne5=) 17.cd5 Bd5 18.h3 Be7 19.e4 Bb7 20.e5 (20.Rc8 Rc8 21.Ba1 Bb4=) 20...Nd5 21.Nc4 (21.Rc8 Rc8 22.Re1 Bb4–/+) 21...Ba8 (21...Nf4 22.Nfd2–/+) 22.Rd4+= Nc5 (22...Nf8 23.Rg4+=) 23.Ba1 Bf8 (23...Nc7 24.Ncd2=) 24.a3 (24.Nfd2 Rd7=) 24...a4 25.Nfd2 Qc7 26.Rg4 h5 27.Rg3 (better is 27.Rd4=) 27...Qb7 (27...Ne7!?=) 28.Re1 Black's piece can't move: a8 (better is 28.Nd6 Bd6 29.ed6+/–) 28...Nf4? (28...Qd7 29.Nf3 Be7 30.Nd6+/–) 29.Ree3?? (better is 29.Nd6 Rd6 30.ed6+/–) 29...Ng6 30.Be2 h4 31.Rg4 Qc7 32.Bf3 Bf3 33.Nf3 Be7 34.Bd4 Nd7 35.Bb2 Qc5 36.Bc3 Qc7 37.Re1 Ba3 38.Nh4 Ndf8 39.Nf3 Bc5= 40.Bb4 Ra8 41.Bc5 Qc5= 42.h4 a3 43.Qa2 Qb5 44.Rb1 Qc5 45.Nb6 Rab8 46.Rc4 Qa5 47.Ra4 Qc5 48.Rc4 ½–½. Danek,Vaclav (1905) – Ceplecha,Tomas (1945), Klatovy op–B, 2002.

7.Be2 Be7 8.0–0 dc4 9.Na3 =.

7.e4 b6 8.d4 Ne4 (8...de4 9.Ne5–/+) 9.Bd3 Nd6 (9...Bb7 10.0–0–/+) 10.Nbd2 (10.cd5 ed5 11.dc5 Nc5=+) 10...f6 (10...Bb7 11.Rc1–/+) 11.Qc2 (better 11.Qe2 Be7 12.0–0=+ (12.Qe6? Ne5 13.Qe7 Qe7 14.de5 dc4 15.Nc4 Nc4 16.Bc4 Be6 17.Be6 Qe6–+)) 11...Nf5?? (11...Bb7 12.Bh7 dc4 13.Bg6 Ke7 14.dc5 Nc5 15.Nc4 Bf3 16.gf3 Nb5 17.Rd1=) 12.g4?? (better 12.cd5 Nb8 13.de6+–) 12...Nh6 (12...Nd4 13.Nd4 cd4 14.Bh7=+) 13.Rg1 Nf7 (13...Bb7 14.Bh7 Nf7 15.g5=) 14.Bh7 Bb7 15.cd5 Bd5 16.Be4 cd4 (16...Rc8 17.Bd5 ed5 18.Kd1=) 17.Bd5 ed5 18.Bd4 Rc8 19.Qf5 Bb4 (19...Nc5 20.g5 fg5 21.Ng5=) 20.Qd5 (better 20.Kd1=) 20...Rc2 (better 20...Nde5!? 21.Qe6 Kf8 22.Be5 Ne5 23.Ne5 Bd2 (23...Qd2? 24.Kf1 Rc1 25.Rc1 Qc1 26.Kg2 Rh2 27.Kh2 Qf4 28.Kh3 Qe5 29.Qe5 fe5 30.Rc1+–) 24.Ke2 fe5=) 21.Kd1+– Qc7?? (better 21...Rc8!?+–) 22.Qb3 (better 22.Qe4 Nfe5 23.Qc2 Qc2 24.Kc2 Bd2 25.Nd2 (25.Kd2?! Nf3 26.Ke3 Ng1 27.Rg1 Rh2+=) 25...Rh2 26.Rh1+–) 22...Rd2 23.Nd2 Qh2 (23...Qd6 24.Qe3 Nfe5 25.Rc1 Bd2 26.Kd2 Rh2 27.Rc8 Ke7 28.Rd1+–) 24.Ke2 (better 24.Re1 Be7 25.Rc1+–) 24...Qd6 25.Rh1?? (25.Nf3!? Rh3 26.Rad1 Qe7 27.Be3 Bc5+–) 25...Rh1?? (25...Qd4 26.Rh8 Nh8 27.Qe6 Kf8 28.Nb3 Qb2 29.Kf1–/+) 26.Rh1?? (26.Qe3 Nde5 27.Rh1+–) 26...Nc5?? (26...Qd4 27.Qe6 Kd8 28.Nf3 Qb2 29.Kf1–+) 27.Qc2?? (27.Qe3 Kf8+–) 27...Bd2?? (better 27...Qd4 28.Nc4 Ne4–+) 28.Bc5+– Qd5 (28...bc5 29.Qd2 Qe6 30.Kf1 Qg4 31.b6+– (31.Qa5?! Qc4 32.Kg2 Qg4 33.Kh2 Qf4 34.Kg1 Qg4 35.Kf1 Qc4 36.Kg2 Qg4 37.Kf1=)) 29.Bb6 (better 29.Rd1 bc5 30.Rd2 (30.Qd2?! Qc4 31.Qd3 Qg4 32.Kf1 Ne5 33.Qd8 Kf7+–) 30...Qe6 31.Kf1 Qg4 32.Qc5 Qh3 33.Ke1+–) 29...Be3?? (29...Qb5 30.Kd2 Qb6 31.Ke1+–) 30.Rd1 (better 30.Ke3 Qh1 31.Qc8 Ke7 32.Bc5 Nd6 33.Qc7 Ke8 34.Qd6 Qe1 35.Kf3 Qh1 36.Ke2 Qe4 37.Kd2 Kf7+–) 30...Qe6?? (better 30...Qb5 31.Ke3 Qb6 32.Rd4 Ne5+–) 31.Be3 Qg4 (31...Ne5 32.Rd4 Kf8 33.g5+–) 32.Kd2 (32.f3!? Qg2 33.Bf2 Ne5 34.Qc8 Kf7 35.Qb7 Ke8 36.Qa8 Kf7 37.Qd5 Kf8+–) 32...Ne5 33.Kc1 Nc4 (33...Qc4 34.Qc4 Nc4 35.b6 Nb6 36.Bb6+–) 34.b6 Nb6 35.Bb6 Qf4 (35...Kf7 36.Qc7 Kg8 37.Ba5+–) 36.Rd2 (36.Be3 Qg4 37.Qc7 Qd1 38.Kd1 Kf8 39.Qa5 Kf7 40.Qh5 Ke6 41.Qe8 Kd6 42.Bf4 Kc5 43.Qe6 f5 44.Be3 Kb4 45.Qb3 Ka5 46.a4 g5 47.Qb5) 36...Qg5 (36...Kf7+–) 37.Qc7 Kf8 38.f4 (38.f4 Qc5 39.Bc5 Kg8 40.Bf8 Kf8 41.Rd8) 1–0. Roczniak,Jan – Smigielski, Poland (year?).

7.e4 de4 8.Ng5 h6 9.Nh3 –/+.

7.d4 cd4

8.Bd4 Bb4 9.Bc3 0–0 10.Bb4 ab4 11.cd5 Nd5 12.Bc4 =.

8.Bd4 Bb4 9.Bc3 Qe7 =.

8.Bd4 Bb4 9.Nbd2 0–0 10.a3 Be7 11.Bd3 h6 12.0–0 b6 13.cd5 Nd5 14.Ne4 Bb7 15.Bb2 Rc8 16.Qe2 Nc5 17.Nc5 Bc5 18.Be5 Bd6 19.Bd4 (19.Qb2 Be5 20.Ne5 f6=) 19...Qe7 (19...Nc3 20.Bc3 Rc3 21.Rfd1–/+) 20.Be4 (better is 20.e4!? Nf4 21.Qe3 Nd3 22.Qd3=) 20...Nc3–/+ 21.Bc3 Be4 (21...Rc3?! 22.Bb7 Qb7 23.Qd2=) 22.Bd4 Rc2 23.Qd1 Bc5 24.Bc5 Qc5 25.Nd4 Qg5 26.g3 Rc3 (26...Rd8 27.Rc1 Rb2+=) 27.f4? (27.Ne6 fe6 28.Qd4–+) 27...Qd5 28.Qe1 Qc4 29.Qf2 Qd3 30.Rfe1 Ra3 31.Ra3 Qa3 32.Qe2 Rc8 33.Qd2 Rc3 34.Kf2 f6 35.Kg1 e5 36.Ne2? Rc2 37.Qd8 Kh7 38.Qb6 Qa2 39.Kf1 Bd3 40.Qb7 Re2 (40...Re2 41.Qf3 Re3 42.Re2 Rf3 43.Kg2 Qe2 44.Kh3 Bf5 45.Kh4 Qh2) 0–1. Schmidbauer,Josef (1605) – Schaefer,Udo (1870), Niederbayernliga, 2003.

8.Bd4 Bb4 9.Nbd2+= e5 10.Bb2 e4 11.a3 Bd6 12.Nd4 =.

8.Bd4 dc4 9.Bc4 Bd6 +=.

8.Bd4 Bd6 =.

5.f4 Nf6

6.Nf3 Nbd7

7.a4 b6 8.Be2 Bb7 9.c4 Ne4 10.Na3 f6 11.Qc2 Qc7 12.d3 Nd6 13.Qb3 0–0–0 14.Rf1 Nf5= 15.Nc2 h5 16.g3 Bd6 17.Nd2 h4 18.g4 Ne3 19.Ne3 Bf4 20.Nd1 Bh2–/+ 21.Nf2 d4 22.0–0–0 Bg2 23.Kb1 Bf1–+ 24.Rf1 g5 25.Nde4 Bf4 26.Nh3 Rdg8 27.Qd1 f5 28.Nef2 Be3 29.Bf3 Ne5 30.Qe2 Nf3 31.Qf3 Qb7 32.Qe2 fg4?? 33.Ng4=+ Rf8 34.Ne3+– de3 35.Bh8 Rh8 36.Qe3 g4+/– 37.Ng5 h3? 38.Nf7+– (38...Rf8 39.Nd6 Kc7 40.Rf8 (40.Nb7?! Rf1 41.Kc2 Kb7+–) 40...Qh1 41.Kc2 Qh2 42.Rf2 Qf2 43.Qf2 Kd6 44.Qf4 e5 45.Qg4+–; 38.Ne6? h2–+; 38.Qe6?! Qd7 39.Qe4 Re8 40.Qa8 Kc7 41.Qa7 Kc8 42.Qd7 Kd7+/–) 1–0. Zhukov – Plunge, URS farmers, 1967.

7.c4 Bd6 8.Nc3 Nb6 9.cd5 ed5 10.a4 0–0 11.Be2 Re8–/+ 12.Qc2 d4! 13.ed4 cd4 14.Nd4 Nc4 15.Nb3 Bg4 16.Nc1? Bf4 17.0–0 Qd4 18.Kh1 Nb2 19.Nb3 Qe5 20.Bg4 Ng4–+ 21.d4 Qg5 22.g3 Bg3! 23.hg3 Re3 24.Rf2 Nf2 25.Qf2 Rc3 26.Rf1 Qd5 (26...Qd5 27.Kh2 Qh5 28.Kg2 Nd3 29.Qf7 Qf7 30.Rf7 Kf7–+) 0–1. De Cat,Ben – Bieluszewski,Piotr (2165), 15th ch–NATO, The Hague NED, 2004.

7.Be2 a4 8.0–0 c4 9.Bd4 Be7 10.Nc3 0–0= 11.h3 Ne8 12.g4 Nd6 13.d3 Qa5 14.Rb1 Bd8 15.Qe1 Bb6 16.dc4 Bd4 17.ed4 Nc4 18.Bc4 dc4 19.Ne4 Qe1 20.Rfe1+= Nb6 21.Nc3 Rd8 22.Re5 Nd7 23.Re4 Nb6 24.a3 f6 25.Rb4 Bd7 26.Re2 Nd5 27.Nd5 ed5 28.Nd2 Ra5 29.b6+= Kf8 30.Nb1 Be8 31.Nc3+= Rd6 32.Re1 h5 33.Kf2 Bd7 34.Kf3 Be8 35.Kg3 Ra6 36.Re8 Ke8+= 37.Nb5 Kd7 38.Nd6 Kd6 39.gh5 Kc6 40.Kg4 Rb6?? 41.Rb6–/+ Kb6 42.Kf5 Kc6 43.Kg6 b5 44.Kg7 b4 45.h6 ba3 The passed pawn on a3 will quickly become a dangerous weapon 46.h7 a2 47.h8Q a1Q 48.Qc8 Kd6 49.Qc5+/– Ke6 50.Qc6 Kf5 51.Qf6 Ke4 52.f5?? Ke3?? 53.Qg5 Ke2 54.Qg4 Kd2 55.f6 Qb2 56.f7 Qb7 1–0. Bach,Mat (2260) – Foerster,A (2230), 11th IHEM Hamburg GER, 2008.

7.Be2 b6 8.0–0 Ne4 9.d3 Nd6 10.a4 Nf5 11.Qd2 Bb7 12.g4? Nd6 13.h3 f6 14.Qe1 Qc7 15.Nbd2 0–0–0 16.Ra3 Kb8 17.d4 c4 18.c3 h5 19.gh5 Nf5 20.Bd1 Ba3 21.Ba3 g6 22.Nh4 Nh4 23.Qh4 Rdg8 24.Kh2 gh5 25.Bf3 Qd8 26.e4 Qe8 27.Qf2 Qg6 28.Rg1 Qg1 29.Qg1 Rg1 30.Kg1 de4 31.Ne4 Rg8 32.Kf2 Be4 33.Be4 h4! 34.f5 e5 35.Bc6 Kc7 36.Bd7 Kd7 37.de5 fe5 38.Ke3 Rg3 39.Ke4 Rc3 40.Bb2 Rc2 41.Ba3 Re2 42.Kd5 c3 43.f6 c2 44.f7 Rf2 0–1. Schiffler – Grosser, Bad Lausick 1951.

7.Be2 b6 8.0–0 Be7 =.

7.Be2 b6 8.c4 Bb7 9.0–0 Ne4 10.a4 Ndf6 11.Ne5 Be7 12.Bf3 0–0 13.d3+= Nd6 14.cd5 Nd5= 15.Qd2 Qc7 16.Ng4 Rad8 17.Na3 Nb4 18.Bb7 Qb7 19.Rad1 Rd7 20.Qe2 f6 21.e4 Nf7 22.Rf3 Qc7 23.Rg3 Kh8 24.Nc4 Rfd8 25.Ba1 h6 26.Bc3 Rg8 27.Rf1 Qd8 28.Rff3 h5 29.Nf2+= Nh6 30.Rg6 Kh7 31.f5 ef5 32.ef5 Nd5 33.Bd2 Bf8 34.Rh3 Re7 35.Ne4+– (35...Rb7 36.Qh5+–) 1–0. Staberg,Karl Arne – Nykvist, corr SSKK 2–782, 1994.

7.Be2 Be7 8.0–0 0–0 9.a4 Ne4 10.d3 Nd6 11.Qe1 f5 12.Nbd2 Bf6 13.Ne5 Be5 14.fe5 Nf7 15.Qg3 Qg5 16.Qf4 Qf4 17.ef4 g5 18.fg5 Ng5 19.Bh5 Nb6 20.Nb3 Nd7 21.Rae1 c4 22.Nd4 cd3 23.cd3 Nc5 24.Rd1 Bd7 25.Ba3 Rfc8 26.h4 Nf7 27.Bf7 Kf7 28.g4 Na4 29.gf5 Rg8 30.Kh2 ef5 31.Nf5 Bf5 32.Rf5 Ke8 33.Rdf1 Rc8 34.Rf8 Rf8 35.Rf8 Kd7 36.e6 1–0. Zalys – Bagusis, Montreal 1982.

4.e3 Bf5

5.c4 Bb1 6.Rb1+/– d4 (6...e6!? 7.cd5 ed5 8.Ne2+/–) 7.ed4+– cd4 8.Nf3 e5 (8...Nd7 9.Bd4 Ngf6 10.Be2+–) 9.Ne5 Bc5 (9...Nf6 10.Qe2 Be7 11.g3+–) 10.Nd3 (10.Qg4 Nd7 11.Nd7 Qd7 12.Qg7 Qe6 13.Kd1 Qf6 14.Qf6 Nf6+–) 10...Nd7 11.Qg4 (11.Qe2 Ne7 12.g3 0–0+–) 11...Qe7 12.Be2 (better is 12.Kd1 Ngf6 13.Qg7+–) 12...Nh6?? (better is 12...Ngf6 13.Qg7 Rg8+–) 13.Qg7 Qf6 (13...Qf8 14.Qg5 Qd6+–) 14.Qf6 Nf6 15.Nc5 (15.Nc5 0–0–0 16.0–0+–) 1–0. Michalak,Marek (1935) – Guc,Mieczyslaw, Lukowica, 2012.

5.Nf3 Nd7 6.c4 e6= 7.Be2 Ngf6 8.Nc3 Be7 9.d4 0–0 10.0–0 Rc8 11.cd5+= Nd5 12.Nd5 ed5 13.dc5 Nc5 14.Rc1 Be6 15.Nd4 Ne4 16.Ne6 fe6= 17.Bg4 Qd7 18.f3 Nf6 19.Bh3 Bc5 20.Qd3 b6 21.a4 Qe7 22.f4 Kh8 23.Qc3 Ne4 24.Qd3 Nd6 25.Bd4 Nf5 26.Rfd1 Qd6 27.g3 Qe7 28.Qd2 Qd6 29.Kf2 Qe7 30.Bc5= Rc5 31.Rc5 Qc5 32.Rc1 Qa3 33.Rc6 Qa4 34.Bf5?? ef5?? 35.Qd5+= Re8 36.Qf5 Qb3 37.e4+/– Qd1? 38.Rc8+– Qd2 39.Kf3 Qd3 40.Kg2 Qe2? 41.Kh3+– Rg8 42.e5?? h6 43.Rg8+– Kg8 44.e6 Qf1?? 45.Kh4+– Qe2 46.h3 Qe3 47.Qf7 Kh8 48.e7 g5 49.Kh5 Qf3 50.Kg6 (50...Qd3 51.f5 Qd6 52.Qf6 Qf6 53.Kf6 Kh7 54.e8Q g4 55.Qd7 Kg8 56.Qg7; 50.Kh6 Qh5 51.Kh5 gf4 52.e8Q#) 1–0. Ranby,Hans – Andersson,Mikael, Karlskrona, 1983.

5.Nf3 Nf6 6.Be2 e6 7.0–0 Nbd7 8.a4 Bd6 9.c4 0–0 10.d4 Rc8 11.Nbd2 Ne4 12.Rc1 Nb6 13.Ne4 Be4 (13...de4 14.Nd2=) 14.Nd2 Bg6 15.Qb3 (15.cd5 Nd5 16.Nc4 Be7+=) 15...dc4 16.Nc4 Nc4 17.Rc4 cd4 18.Bd4 Rc4 19.Qc4 e5 (19...Qb8 20.f4=) 20.Bc3+= e4 (better is 20...b6!?+=) 21.Qd4+/– Qf6 22.Qf6 gf6 23.Bf6 Rc8 24.Rd1 Bb4 25.Rd8 (25.Bg4!? Rb8 26.Rd7+–) 25...Rd8+/– 26.Bd8 Kf8 27.Bc7 Ke7 28.Bc4 Kd7 29.Be5 Bh5 30.Bd5 b6 (30...Bd1 31.Be4 Ba4 32.b6+/–) 31.f3 (31.Be4!? Bd1 32.Bf5 Ke7 33.Bh7 Ba4+–) 31...ef3+/– 32.gf3 Bd6 (32...Bc5 33.Kf2+/–) 33.Bf6 (33.Bd4 Kc7+–) 33...Bc5+/– 34.Kf2 Kd6 35.Bc6 (35.Bb3 Bg6+–) 35...Bg6+/– 36.Be4 Be4 37.fe4 Ke6 (better is 37...Kc7!?+/–) 38.Bd4+– Kd6 39.Ke2 1–0. Ehrlich,Hans Georg (1930) – Lerke,Bernd (1995), Muensterland Verbandsliga, 2007.

5.f4 h5 6.Be2 e6 7.Nf3 Nd7 8.a4 Bg4 9.0–0+= Ngf6 10.c4 h4 (10...Bd6+=) 11.h3 Bf3 (11...Bf5 12.cd5 Nd5 13.Na3+=) 12.Bf3 (12.gf3 Not 12...d4+=) 12...Qc7 13.Nc3 (13.cd5 ed5 14.Nc3 Nb6+=) 13...d4 (13...dc4 14.Ne4+=) 14.Ne4 (14.Ne2 de3 15.de3 Be7+/–) 14...Ne4 15.Be4 Nf6 (15...g6 16.Qf3 0–0–0 17.Bd3+=) 16.Qf3 (16.Bf3 0–0–0+/–) 16...Ne4 (16...0–0–0 17.f5+=) 17.Qe4+/– Rd8 ½–½. Olexa,Vilem – Laska,Karol, CSR–ch sf Zlin, 1958.

5.Nf3 e6

6.c4 Nf6 7.Nc3 Nbd7 8.Be2 dc4 9.Bc4 h6 10.d4 Rc8 11.Bd3 (11.0–0!?=) 11...cd4–/+ 12.Nd4 Bd3 13.Qd3 Nb6 14.Rd1 e5 15.Qf5? (better is 15.Nc2+=) 15...ed4–+ 16.Rd4 Bd6 17.0–0 0–0 18.Ne4 Ne4 19.Re4 g6 20.Qg4 Rc2 21.Bd4 Ra2 22.Be5 (22.Qh3 h5–+) 22...Be5 23.Re5 a4 24.Re6 (24.Rh5–+) 24...Qd7 (24...fe6?! 25.Qg6 Kh8 26.Qh6 Kg8 27.Qg6 Kh8 28.Qh6 Kg8 29.Qg6 Kh8 30.Qh6=) 25.Rg6 (25.Re4 Qg4 26.Rg4–+) 25...fg6 26.Qg6 Qg7 27.Qb6 (27.Qd3–+) 27...Raf2! 28.Qe6 Kh8 (28...Kh8 29.Qh6 Qh6 30.Rf2 Qe3 31.h3 Qf2 32.Kh1 Qe1 33.Kh2 Rf1 34.g4 Qf2) 0–1. Rush,Bradley – Herzog,Klaus (1805), OP–2011–0–01576, 2011.

6.c4 Nf6= 7.Be2 dc4 8.Na3 Be7 9.Nc4 0–0 10.0–0 Nbd7 11.Rc1 Nb6 (11...Nd5 12.d3 N5b6 13.d4=) 12.d4+= Nc4 13.Rc4 cd4 14.Bd4 Ne4 (14...Rc8 15.Qa4+=) 15.Qa1 (15.Qa4 Nd6 16.Rcc1 Nc8+=) 15...f6 16.Rd1 Qe8 17.a4 e5 (17...Rc8 18.Nh4+/–) 18.Bb6+/– Bb4 19.Nh4 Qe6 20.Nf5 Qf5 21.Bf3 Ng5 (21...Qe6 22.Be4 (22.Re4?! Qb6 23.Rc4 Rad8+=) 22...Qb6 23.Rd7+–) 22.Bb7 Rab8 23.Bd5 Kh8 24.Bc5 ( 24.Bc7!? Rbc8 25.Qb1+–) 24...Bc5+/– 25.Rc5 e4 26.Qc1 Qg4 27.Kh1 f5 28.Rd4 h5 29.Qd1 Qh4 30.Rc2 Nh7 31.Bc4 Rb6 32.Rd6 Rd6 33.Qd6 Rd8 34.Rd2?? Rd6–+ 35.Rd6 Qe7 36.Rc6 Nf6 37.h3. Joergensen,Klaus – Vogler,Tilmann, Ellmendingen op, 1978.

6.Be2 Nd7 =.

6.Be2 Nf6 7.0–0 Bd6 8.Nh4 Bg6 9.f4 Qc7 10.g4 0–0 11.Bf6 (11.g5 Ne8+=) 11...gf6 12.f5 Bh2 13.Kh1 Bg3 14.Ng2 ef5 15.Nc3 ( 15.gf5 Qd7 16.Rf3= (16.fg6?? Qh3 17.Kg1 Qh2)) 15...d4 16.Nd5 Qd6 (16...Qe5 17.Nb6 fg4 18.Bg4–/+) 17.Bc4=+ fg4 18.Qg4 Be5 19.e4 Nd7 20.Nh4 Kh8 21.Rf3 (21.Nf5 Bf5 22.Rf5 Rg8–/+) 21...Rg8 22.Rh3 Rg7 23.Rf1 Nb6 24.Nb6 Qb6 25.a4 (25.Nf5 Bf5 26.Qf5 Rag8–/+) 25...Qc7–/+ 26.Nf5 Bf5 (26...Qd7 27.Qd1–/+) 27.Qf5 Rag8 28.Rh5 Qd7?? ( 28...Qd6–/+) 29.Qd7+– (29…d3 30.Bd3+–) 1–0. Bendig,Frank – Neri,Enzo, corr ICCF TT–6/02/1, 2002.

6.Be2 Nf6 7.d3 Be7 8.a4 0–0 9.Nbd2 1–0. Fournier,Frederic (2560) – Mekal (2370), Echecsemail.com (Team), 2013.

4.e3 f6

5.c4 d4 6.ed4 cd4 7.d3 e5 8.Nf3 Bc5 9.Be2 Nd7 10.0–0 Ne7 11.a4 0–0 12.Nfd2 b6 13.Nb3 Bb7 14.N1d2 Qc7 15.Bf3 Rac8 16.Bb7 Qb7 17.Ne4 Bb4 18.Ba3 (18.f4 Nf5 19.Bc1 Rf7=) 18...Ba3 19.Ra3 Qc7 20.Ra1 Nf5 21.Rc1 Nd6 22.Ned2 (22.Qf3 Rfd8=) 22...Nc5 23.Nc5 Qc5 24.Qb3 Nb7 25.Ne4 Qe7 (better 25...Qb4!? 26.Qa2 Kh8=) 26.c5+– Qf7? (better 26...Kh8 27.c6 Nd6+–) 27.Qf7+– Kf7 (27...Rf7 28.c6 Rfc7+–) 28.c6 (28.cb6?! Rc1 29.Rc1 Kg6+–) 28...Nd8 (28...Nc5 29.Nc5 bc5 30.Rc5 Rfe8+–) 29.Nd6 Ke7 (29...Kg6 30.Nc8 Ne6 31.Nb6+–) 30.Nc8 Ke6 (30...Kf7 31.Nb6 Ne6 32.c7+–) 1–0. BeepBeepImAJeep (2610) – zsolti_83 (2450), lichess.org, 2016.

5.c4 d4 6.Qh5 g6 7.Qc5 e5 8.Qd5 Bd6? (8...Qd5!? 9.cd5 Bf5+–) 9.c5+– ½–½. GuestNFTH – taitadeocho, freechess.org, 2017.

4.e3 Nf6

5.a4 Bf5 6.Nf3 e6 7.Be2 h5 (7...Bd6 8.Nh4=) 8.0–0+= h4 9.h3 Nbd7 10.d3 Bd6 11.Nbd2 Bc7 (11...Kf8 12.c4+=) 12.Nh2 (12.c4 dc4 13.Nc4 Kf8+=) 12...Ne5 (12...Qb8 13.Ndf3=) 13.f4 Ng6 14.Ng4 (14.Nhf3 Qd6+=) 14...Bg4 15.Bg4 Ng4 16.Qg4 (worse 16.hg4 h3=+) 16...Qd6 (16...0–0!?+=) 17.Bg7+– Rg8 18.Be5! Qe7 (18...Ne5 19.Nf3 Double attack (19.Qg8 Pinning; 19.Qg8 Deflection; 19.Nf3 Decoy; 19.Qg8 Clearance)) 19.Bc7 Qc7 20.Nf3 (20.e4 de4 21.f5 e3 22.fe6 fe6 23.Qe6 Ne7+–) 20...0–0–0 21.Nh4 Ne7 22.Qh5 White plans f5 22...Rh8 23.Qf7 (23.Qg5 Rh7+–) 23...Rh4+= 24.Qe6 Kb8 (better 24...Rd7+=) 25.f5?? (better 25.b6 Qd6 26.Qd6 Rd6 27.Rab1+–) 25...Rh3=+ 26.gh3?? (better 26.Rf4 Rd6 27.Qf7 Re3 28.f6=) 26...Qg3 27.Kh1 Qh3 28.Kg1 Qg3 29.Kh1 Rh8 (29...Rh8 30.Qh6 Rh6) 0–1. Abdullaevich (1835) – arunsadanala (1940), lichess.org, 2020.

5.c4 Nbd7 6.Nf3 e6 (--> 4.e3 e6 5.c4 Nf6 6.Nf3 Nbd7).

5.c4 e6 6.Nf3 Be7 7.a4 0–0 8.Be2 d4 (better 8...dc4!? 9.0–0 Nbd7=) 9.ed4+– cd4 10.Bd4 Nbd7 11.0–0 e5 (better 11...Bd6+–) 12.Be5?? (better 12.Ne5 Re8 13.Nd7 Bd7 14.Be5+–) 12...Ne5–/+ 13.Ne5 Qd4 14.Nc3 Qe5 15.d4 Qg5 16.Bf3 Bg4 (16...Re8 17.Re1–/+) 17.Re1 Bb4 18.Re3 (18.Ne4 Ne4 19.Re4 f5–+) 18...Bc3 (18...Rfe8!? 19.Rd3–+) 19.Rc3–/+ Bf3 20.Qf3 Rfe8 21.h3 Ne4 (21...Rad8 22.Rd1–/+) 22.Rd3 Qg6 23.Rad1 Ng5 (23...Rac8 24.c5–/+) 24.Qg3 (24.Qb7 Qe6 25.Qc6 Qf5+=) 24...h6 (24...Qf6 25.c5–/+) 25.c5 (better 25.h4 Ne6 26.Qg6 fg6 27.Re1=) 25...Ne4?? (better 25...Qf5–/+) 26.Qg6+– fg6 27.c6 (27.f3 Nf6 28.d5 Rac8+=) 27...bc6= 28.bc6 Rac8 29.d5 Red8 30.f3 (30.Rc1 Rd6+=) 30...Nd6 (30...Nf6 31.g3+=) 31.Rd4 (31.Rc3 Nf5 32.Kf2 Ne7=+) 31...Kf7 (31...Nf5 32.R4d3=) 32.g4 (32.Rf4 Kg8 33.Kf2 g5+=) 32...Kf6 (32...Re8 33.Kf2=) 33.Re1 (better 33.Rc1+=) 33...Nf7?? (33...Re8 34.Rdd1 Re1 35.Re1 Re8–/+) 34.Re6 (better 34.Rf4!? Kg5 35.Rf7 Rd5+–) 34...Kg5 35.Kg2 (better 35.f4!? Kh4 36.Rg6+–) 35...Kh4+= 36.Rg6 Ng5 37.Rg7 (better 37.f4 Nh3 38.Kf3+–) 37...Rc6=+ 38.dc6 Exploits the pin 38...Rd4 39.Kf2 Rd2?? (better 39...Ra4 40.Rg6 Nh3 41.Ke3 Ra3 42.Kd2 Rf3–/+) 40.Ke3+= Rc2 41.f4 (41.Rg6!?+–) 41...Rc6 (41...Nh3!? 42.c7 Kg3+=) 42.Rg6?? (42.Rg6 Rg6 43.fg5 Rg5 44.Kd3–+; better 42.fg5 hg5 43.Rh7 Kg3 44.Rh5 Rc3 45.Ke4 Rc4 46.Kf5 Ra4 47.Kg5+=) 1–0. BeepBeepImAJeep (2605) – BayorMiller (1840), lichess.org, 2017.

5.Be2 Nbd7 6.Nf3 b6 7.c4 Bb7 8.cd5 Bd5 9.0–0 e6 10.Nc3 Bd6 11.Nd5 ed5 12.d4 c4 13.Qc2 0–0 14.Qf5 g6 15.Qg5 Re8 16.Rac1 Nf8 17.g3 Ne6 18.Qh4 Be7 19.Bc3 Ne4 20.Qh6 Bf8 21.Qh3 f5 22.Ne5 Bg7 23.Nc6 Qd6 24.Ba1 N6g5 25.Qh4 Bf6 26.Kh1 Qa3 27.Rc2 Qa4 28.Rb2 Nf2 29.Rf2 Ne4 30.Qf4 Nf2 31.Qf2 c3 32.Rb1 Qa2 33.Rf1 Qd2 34.Bf3 Re3 35.Bd5 Kg7 36.Qg1 c2 37.Bb2 Qd3 38.Nb4 ab4 39.Ba8 b3 40.Rf4 Qd1 41.Rf1 Qd3 42.Rf4 Re2 43.Bc6 Rd2 44.Rf3 Qe2 45.Re3 Qb5 46.Bb5 Rd1 47.Re1 Rd2 48.Bc4 Kh6 49.Bc1 1–0. marekt – NN, GameColony.com, 2002.

5.Nf3 b6 6.a4 Nbd7 7.Rg1 (7.c4 e6=) 7...e6 (7...Qc7 8.g4=+) 8.g4=+ Bb7 (8...h6 9.h4=) 9.g5= Ne4 10.h4 (10.d3 Nd6=) 10...Nd6 (10...Qe7 11.h5=) 11.Bh3 (11.h5 Qe7=) 11...Qc7=+ 12.h5 0–0–0 13.g6?? (better 13.Na3=) 13...hg6–+ 14.Ng5 Rh5 (14...gh5 15.Be6 f6 16.Nh3–+) 15.Be6–/+ fe6 (15...Re8 16.Bg4 (16.Bf7? Nf7 17.Nf7 Rf5–+) 16...Rh2 17.Na3–/+) 16.Ne6 Qb8 17.Nd8 Kd8 18.Nc3 (18.d3 Nf5 19.Nd2 Kc8–/+) 18...Nf6 (better 18...Nc4!? 19.Bc1 d4–+) 19.Ne2 Nde4 (19...Nc4 20.Bf6 gf6 21.Nf4–+) 20.Nf4 (20.d3 Ng5 21.Nf4 d4 22.Nh5 Nf3 23.Kf1 gh5–+) 20...Rh2 21.Qf3? (better 21.Rf1!?–/+) 21...Rf2–+ 22.Qh3 Rd2 23.Ne6 (23.Qh8 Qd6 24.Ng6 Nd7 (24...Rc2?! 25.Nf8 Ne8 26.Bg7=+) 25.Bg7 Rf2–+) 23...Ke8 (23...Ke7 24.Nf4 Qc8 (24...Rc2?! 25.Ng6 Kd8 26.Qh8=+) 25.Bf6 Kf6 26.Rg6 Kf7 27.Rb6 Be7 28.Qh5 Kg8–/+) 24.Rg6? (better 24.Nf8 Rh2 25.Qe6 Kf8 26.Be5–+) 24...Kf7 (24...Rh2 25.Qf3 Rf2 26.Qh3–+) 25.Nf4 (25.Nf8 Qf8 26.Rg2–+) 25...Bc8 (better 25...Qc8!? 26.Qh4 d4 27.Rg1–+) 26.Qf3? (26.Qh8 A) 26...Rc2 27.Bf6 Nf6 28.Rf6 gf6 29.Qh7 Ke8 30.Qg6 Kd8 31.Qf6 (31.Qc2 Qe5 32.0–0–0 Qe3 33.Qd2 Qd2 34.Rd2 Bh6 35.Nd5 Bd2 36.Kd2 Be6 37.Nf6 Bb3–+) 31...Be7 32.Qh8 Kc7 33.Qh7–/+; B) 26...Rd4!–+) 26...Rc2 (26...Bd6 27.Bf6 Bf4–+ (27...Nf6? 28.Rf6 gf6 29.Kd2 Bf4 30.ef4+–; 27...gf6 28.Qh5 Bf4 29.ef4–+)) 27.Bf6 gf6?? (27...Rh2 28.Bb2 Bf5= (28...Rb2 29.Qh5 Nf6 30.Rf6 Kf6 31.Nd5 Ke6 32.Qg6 Ke5 33.Qg3 Kd5 34.Qb8+–)) 28.Rg1?? (better 28.Qh5 Ke7 29.Nd5 Ke6 30.Nf4 Ke7 31.Rd1+–) 28...Qe5–+ 29.Qh5 Qh5 30.Nh5 Bd6 31.Nf4 (31.Rg7 Kf8 32.Rh7–+) 31...Be5 32.Rd1 (32.Rb1 Bf4 33.ef4–+) 32…Bc3 (32...Bc3 33.Rd2 Rd2–+) 0–1. FeegLood (2665) – ferrari9182 (2415), lichess.org, 2015.

5.Nf3 e6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c5 5.Nf3 a5).

5.Nf3 Bf5 6.Be2 e6 7.0–0 Nbd7 8.Nh4 Bd6 (8...Bg6 9.Ng6 hg6 10.d3=) 9.Nf5 ef5 10.c4 0–0 11.cd5 Nd5 12.Qc2 f4 (12...Qg5 13.f4 Qg6 14.Rf3+/–) 13.Nc3 (13.Bf3 Nb4 14.Qc3 Be5+=) 13...N5f6 14.Bf3 Qc7 15.Kh1 (15.Ne4 fe3 16.Nf6 Nf6 17.Bf6 ef2 18.Kh1 gf6+=) 15...Rad8 16.Ne4 Ne4 17.Be4 h6 18.Rac1 fe3 19.de3 b6 (19...Rfe8!?+=) 20.f4+/– Be7 21.Rcd1 Bf6 22.Bc1 Nb8 23.Bd5 Qe7 24.Rd3 Kh8 (24...Nd7 25.Ba3+/–) 25.Ba3 Rd6 (25...Rfe8 26.e4 Rd5 27.Rd5 Qe4 28.Qe4 Re4 29.Rd6+–) 26.e4+– Rfd8 (26...Qd7 27.Re1+/–) 27.Rfd1 (27.Qc4 Qd7+–) 27...Qd7? ( 27...Re8+–) 28.e5 (28...Be5 29.fe5 Rd5 30.Rd5 Qd5 31.Rd5 Rd5 32.h3+–) 1–0. Ruhle,Ernst_Olav – Neri,Enzo, corr ICCF TT–6–02–3, 2004.

5.Nf3 Bg4 6.Be2 Nbd7 7.d3 (7.h3 Bf3 8.Bf3 e5=) 7...Qc7 (7...Qb6 8.Nc3=) 8.Nbd2 (8.h3 Bf3 9.Bf3 Ne5=) 8...e5 9.h3 Bf3 (9...Bf5 10.c4 a4 11.0–0=) 10.Bf3 (10.Nf3 Bd6=) 10...Bd6 (10...c4 11.dc4 dc4 12.Ne4=) 11.c4 d4 (11...Nb6 12.cd5 Nbd5 13.0–0+=) 12.ed4 (12.0–0 0–0+=) 12...ed4 13.Ne4 (13.0–0 0–0=) 13...Ne4 14.Be4 0–0 15.0–0 f5 (15...Nf6 16.Bf5=+) 16.Bd5= Kh8 17.Bc1 f4 18.a4 Rae8 19.Re1 Nf6 20.Bf3 Re1 21.Qe1 Re8 22.Qd1 b6 23.Ra2 g5 24.Re2+= Re2 25.Qe2 Qe7 26.Qe7 Be7= 27.g3 Bd6 28.g4 h5 29.gh5 Nd7 30.Kg2 Ne5 31.Be4 Kg7 32.f3 Kh6= 33.Bg6 Ng6=+ ½–½. Uvarov,Igor – Tkachenko,Evgeny D (2155), Tula–ch Region, 2002.

5.Nf3 Bg4 6.Be2 e6 7.0–0 =.

5.Nf3 Bg4 6.Be2 Bf3 7.Bf3+= e6 8.c4 Nbd7 9.Qc2 (9.0–0 Bd6+=) 9...Nb6 10.d4 ( 10.cd5 Nbd5 11.0–0=) 10...Nc4–/+ 11.dc5 Bc5 12.Nd2 (12.0–0!?–/+) 12...Bb4–+ 13.0–0?? Nd2 14.Rfd1 Nf3 15.gf3 Rc8 16.Qd3 0–0 17.Be5 Bd6 18.Bg3 Bg3 19.fg3 Qb6 20.Rac1 Rc7 21.Rc2 Rfc8 22.Rdc1 Rc2 23.Rc2 Rc2 24.Qc2 Qb5 25.a4 Qc6 26.Qb2 h6 27.Kf2 Nd7 28.Qb5 Qb5 29.ab5 a4 30.Ke2 a3 (31.h3 a2–+) 0–1. Krickemeyer,Horst – Giering,Helmut, Wch Seniors Bad Liebenzell, 1996.

5.Nf3 Bg4 6.h3 Bf5 =.

5.Nf3 g6 6.c4 Bg7 7.d4 cd4 8.Bd4 0–0 9.c5 (9.Nc3 dc4 10.Rc1 Be6=) 9...Bf5 10.Nbd2 Nbd7 11.Be2 Re8 (11...Qb8 12.Rc1 e5 13.Ba1+=) 12.Ne5 (12.c6 bc6 13.bc6 Nf8+=) 12...Ne4 13.Nd7 (13.Ne4 Be5 (worse is 13...Ne5 14.Ng3+=) 14.Be5 de4=) 13...Qd7 (13...Bd4!? 14.ed4 Nc3+= (worse is 14...Bd7 15.Ne4 de4 16.d5+=; 14...Qd7?! 15.Ne4 de4 16.d5+=)) 14.Ne4 Be4 15.Bg7 Kg7 16.0–0 e5 17.Qb3 a4 18.Qb4 Rec8 (18...d4 19.Rad1 Bc2 20.Rd2=) 19.Rac1 a3 (19...Qe7!?=) 20.Rfd1+/– Bf5?? (better is 20...Rd8+/–) 21.e4!+– Be6 (21...de4 22.Rd7 Pinning (22.Rd7 Deflection); 21...Be4 22.Qe4) 22.ed5 1–0. spargeltarzan (1745) – wwgia (1640), gameknot.com, 2013.

5.f4 b6 6.Nf3 Bg4 7.Be2 e6 8.a4 Ne4 9.0–0 Nd7 10.d3 Nd6 11.Qe1 f6 12.Nc3 g6 13.Nd1! Bg7?! 14.Ng5! Bf5 15.g4 e5! 16.gf5 fg5 17.fg6 hg6 18.Qg3 ef4 19.ef4 Nf5 20.Qg5 Qg5 21.fg5 Bb2 22.Nb2 Ne5 23.c3 0–0–0 24.Rf4 Rde8 25.Raf1 Nf7 26.Bg4 Ng5 27.Bf5 gf5 28.Rf5 Nh3 29.Kg2? Re2 30.Kg3 Rb2 31.Rf8 Rf8 32.Rf8 Kd7 33.Kh3 Ra2 34.Rf6 Ra4 35.Rb6 Ra3 36.Ra6 Rc3 37.Ra5 Rd3 38.Kg4 c4 39.h4 c3 40.b6 c2 41.b7 c1Q 42.b8Q Qd1! 43.Kf5 Qh5 44.Kf6 Rf3 45.Kg7 Rf7 0–1. Kruett – Patalas, Koeln 1953.

5.f4 e6 6.Nf3 Nbd7 (--> 4.e3 e6 5.f4 Nf6 6.Nf3 Nbd7).

5.f4 e6 6.Nf3 Be7 7.Bd3 Nbd7 8.0–0 0–0 9.c4 (9.Nc3 a4 10.a3 Qb6 11.Rb1 Bd6 12.Kh1 c4= –0.16) 9...dc4 (9...Nb6 10.Na3 dc4 11.Bc4 Nc4 12.Nc4 a4= –0.09) 10.Be2 (10.Bc4 Nb6 11.Be2 Nfd5= 12.Nc3 a4= –0.06) 10...Ne4 (10...Nb6 11.Ne5= Nfd5 12.Na3 c3= –0.19) 11.Qc2 (11.Na3 Nd6 12.Bc4 Nc4= –0.03) 11...Bf6 (11...Nd6 12.a4 Bf6= –0.03) 12.Ne5 (12.Be5 Be5= 0.03) 12...Nd6 13.a4 Nb6 (13...Qe7 14.Na3=) 14.e4 Be7 (14...Qe7 15.Na3=) 15.Ra3 (15.Na3 Bf6=) 15...f6 (15...f5 16.ef5 Nf5 17.Bc4=) 16.Ng4 (16.Nc4 Nbc4 17.Bc4 Nc4 18.Qc4 b6=) 16...Nf7 (16...f5 17.Qc3 Bf6 18.Nf6 Rf6 19.Qc2 Ne4 20.Bc4=) 17.Rg3 (17.Ne3 Nd6=) 17...Kh8 (17...Nd6 18.Rh3=) 18.Na3 Bd7 (18...Nd6 19.e5 Nf5 20.Rh3+=) 19.h4 (19.e5 f5 20.Ne3 c3 21.Bc3 Bh4+/–) 19...c3 20.Bc3 c4 (20...Qc7!?=) 21.Nc4+/– Nc4 22.Bc4 Rc8 23.Ne3 Qb6 24.d4 Nd6 25.Qd3 Qc7= 26.Rc1 Nc4 27.Bd2 Qf4 28.Nc4 Qb8 29.Ba5 Qa7 30.Qd2 e5= 31.Rd3 Be6+= 32.Bc7 ed4 33.Nb6= Rc7 34.Rc7 Bd6 35.Nd7 Rd8?? 36.b6+– Qa4 37.Rd4 Qa1?? 38.Rc1 (38.Rc1 Qa6 39.Rd6 Bd7 40.Rc7+–) 1–0. Carbonell,C (2285) – Pascual Genoves,M (2090), XI Open A, Mislata ESP, 2003.

5.f4 Bg4 6.Be2 Be2 7.Ne2 =.

4.Nf3 b6

5.e3 Bb7 6.c4 e6 7.a3 Nd7 8.d4 Ngf6 9.Nbd2 cd4 10.ed4 Bd6 11.Bd3 0–0 12.0–0 Qe7 13.Qe2 Rfe8 14.Ne5 Rad8 15.Nc6 Bc6 16.bc6 Nb8 17.cd5 ed5 18.Qe7 Re7 19.Rac1 Rc7 20.Bb5 Rdc8 21.Rc2 Nc6 22.Rfc1 Na7 23.Rc7 Rc7 24.Rc7 Bc7 25.Bd3 b5 26.Nb3 Kf8 27.Nc5 Ke7 28.g3 Kd6 29.Kf1 Bb6 30.Na6 h5 31.Ke2 Kc6 32.f3 Nd7 33.Ke3 Kb7 34.Nc5 Nc5 35.dc5 Bc5 36.Kf4 g6 37.Kg5 Be7 38.Kh6 Bf8 39.Kh7 Bd6 40.Kg7 Nc6 41.Kf7 b4 42.ab4 Bb4 43.Kg6 a4 44.Kh5 a3 45.Ba1 d4 46.Be4 Bc3 47.Bc3 dc3 48.Bb1 a2 49.Ba2 c2 50.f4 c1Q 51.f5 Qd1 52.Kg6 Qg4 53.Kf6 Nd4 54.Be6 Ne6 55.fe6 Kc7 0–1. ferminkatcho (1770) – madera110 (1780), kurnik, 2012.

5.e3 Bb7 6.Be2 Nd7 7.0–0 Ngf6 8.d3 (8.c4 e6+=) 8...g6 (8...e6 9.Nbd2=) 9.c4+= Bg7 10.cd5 Bd5 11.Nc3 0–0 12.Qc2 Bb7 13.Rfc1 e5 14.Ne4 Qe7 15.Rd1 Nd5 16.Nc3 Rad8 17.Rac1 Nc7 18.Rd2 Ne6 19.a3 f5 20.Qb3 Kh8 21.Rdc2 Ng5 22.Nd2 Nf6 23.Nc4 Qc7 24.Na4 Bd5 25.d4 ed4 26.ed4 Be4 (26...Ne6!? 27.dc5 bc5+=) 27.Ncb6+/– Qb7 ( 27...Bc2!? 28.Qc2 Qf4 29.Nc5 Nge4+/–) 28.dc5+– (< 28.Nc5 Qb6 29.Ne4 Nge4=+) 28...Bg2?? ( 28...Bc2 29.Rc2 f4+–) 29.c6 Qe7 (29...Bc6 30.bc6 (< 30.Rc6 Nge4+–) 30...Qc7 31.Qg3+–) 30.Kg2 Qe4 (30...Ne6 31.Qe3 f4 32.Qh3+–) 31.f3 Qh4 (31...Qe7 32.c7 Rc8 33.Nc8 Rc8 34.b6+–) 32.c7 Qh3 (32...Nh3 33.cd8B Nf4 34.Kh1 Rd8 35.Rc8+–) 33.Kg1 (33…Qh4 34.cd8R Nh3 35.Kh1 Rd8 36.Rc8+–) 1–0. kamret (2190) – peti0815 (2055), GameColony.com, 2003.

5.e3 Nf6 6.Be2 Bb7 7.0–0 Nbd7 8.Re1 e6 9.c4 Bd6 10.cd5 ed5 11.Nc3 0–0 12.Qa4 Re8 13.d4 Ne4 14.dc5 Ndc5 15.Qd4 Ne6 16.Qd3 N4c5 17.Qf5 g6 18.Qc2 Bf8 19.Red1 Nc7 20.Na4 Na4 21.Qa4 Re4 22.Qc2 Rc8 23.Qc3 d4 24.Nd4 Nb5?? 25.Nb5 Qd1 26.Rd1 Rc3 27.Nc3 1–0. kamret (2225) – Orla (1835), GameColony.com, 2003.

4.Nf3 Nd7

5.d3 Ngf6 6.e3 (6.g3 g6=) 6...Qc7 7.c4 e6 8.h3 Bd6 9.Be2 0–0 10.0–0 h6 11.a4 dc4 (11...b6 12.Qc2=) 12.dc4 b6 13.Qc2 Bb7 14.Nfd2 Rfd8 15.Nc3 Re8 (15...Be7 16.Rad1=) 16.Bf3 Bf3 (16...Bh2 17.Kh1 Be5 18.Rad1=) 17.Nf3+= Ne5 18.Ne5 Be5 19.f4 Bc3 20.Bc3 Rad8 21.Rad1 Rd1 (21...Qb7 22.Bf6 gf6 23.Rd2+=) 22.Rd1+= Rd8 23.Be5 Qe7 24.Rd3 Kf8 25.Qd2 Rd3 26.Qd3 Qd7 27.Qd6 Qd6 28.Bd6 Ke8 29.Bc7 Nd7 30.e4 f6 31.f5 Kf7 32.Kf2 g5 33.Kg3 h5 34.h4 Ke7 35.Kh2 Kf7? (35...g4!?+=) 36.g4! ef5? (36...hg4 37.hg5 Combination) 37.ef5+– hg4 38.hg5 fg5 39.Kg3 Kg7 40.Kg4 Kh6 41.Kf3 Kg7 42.Ke4 Kf7 (42...Nf6 43.Ke5 Kf7+–) 43.Kd5 g4 (43...Kf6 44.Kc6 Ne5 45.Kb6 Nc4 46.Kc5 Nb2 47.Ba5 Kf5+–) 44.Kc6 Ke8 45.f6 Nf6 46.Bb6 g3 (46...Nd7 47.Bc7 Ke7+–) 47.Bc5 Nd7 48.Bd4 Ke7 49.c5 g2 (49...Ke6 50.Kb7 Ne5+–) 50.Kb7 1–0. calabuig (2110) – housemd (2045), gameknot.com, 2015.

5.e3 Nb6 6.a4 f6 7.c4 Nc4 8.Bc4 dc4 9.Na3 Qd3 10.Rc1 Qg6 11.g3 Bg4 12.Kf1? ( 12.Nh4!? Qh5 13.f3=) 12...Qh5 (12...e5 13.h3 Be6 14.Nc4 Bc4 15.Rc4 Qd3 16.Qe2 Qb1 17.Bc1=) 13.Kg2 Qh3 14.Kg1 e5 15.Rc4 (15.e4 Rd8 16.Nc4 Rd3=+) 15...Qh5 (15...Rd8 16.Bc3 b6 17.Nc2–/+) 16.Kg2 0–0–0 17.h3 Bf3 18.Qf3 Qf3 19.Kf3 Rd2 20.Rb1 (20.Bc3 Ra2 21.Nb1 b6=+) 20...b6 21.e4 g6 22.Rcc1 Bh6 (22...Rd3!? 23.Ke2 Rd7=+) 23.Rd1+= Rd1 24.Rd1 Kc7 25.Nc4 Bf8 (25...Ne7 26.Ne5! Re8 27.Nc4+–) 26.Ne5!+– Nh6 (26...fe5 27.Be5) 27.Nd7 Be7 28.Bf6 Bf6 (28...Rd8 29.Be5 Kb7 30.Ke2+–) 29.Nf6 Rf8 30.Rd7 Kc8 31.Rd6 (31...Ng8 32.e5 Nf6 33.Rc6 (33.Rf6?! Rf6 34.ef6 Kd7+=) 33...Kb7 34.Rf6+–) 1–0. Muri,H – Soerensen,Joergen, corr ICCF EU–H–703, 1982–83.

3.Bb2 c6

4.a4 (--> 1.b4 a5 2.b5 c6 3.a4 d5 4.Bb2).

4.c4 e6 5.e3 Nf6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c6 5.c4 a5).

4.c4 Bf5 (4...dc4 5.Qa4=+) 5.e3 Nf6 6.Nf3 e6 7.Be2 Bd6 8.0–0 Qe7 (8...dc4 9.Bc4 0–0 10.Nd4=) 9.d4 (9.cd5 cd5 10.Nh4 Bb1 11.Rb1 0–0=) 9...dc4 10.Bc4 0–0 11.a4 cb5 12.Bb5 Na6 13.Nbd2 Nc7 14.Be2 Ne4 15.Nc4 Bb4 16.Nb6 Rad8 17.Rc1 Nd5 18.Nd5 ed5 19.Qb3 Qd6 20.Rfd1 Bg4 (20...Rc8 21.Bd3=) 21.Qd3 Bd7 22.Ra1 (22.Qc2 Rc8 23.Qb3 Bf5=) 22...Rc8=+ 23.Qb3 Bg4 24.Qd3 Rc7 ½–½. Hollstein,Gerhard – Jennewein,Norbert, PF–op Bellheim, 1994.

4.bc6 bc6 5.e3 Qb6 6.Qc1 Ba6 (6...Nd7 7.Nc3=+) 7.d3 Nf6 8.Nf3 Nbd7 9.Be2 (9.Nbd2 e6=) 9...Rb8 10.Bd4 c5 11.Bf6 (11.Bc3 a4=) 11...ef6 (11...Qf6 12.Nbd2=+) 12.Nc3= d4 (12...Qb4 13.Qd2 d4 14.Nd1=) 13.Nd5 (13.Rb1 Qd8 14.Rb8 Qb8=) 13...Qd6 14.e4 Be7 (14...Nb6 15.Nb6 Qb6 16.0–0=+) 15.Nh4 (15.Qa3 Bb7 16.Ne7 Qe7=) 15...g6 16.0–0 (16.Qd2 Bb7=+) 16...Ne5 (16...f5 17.Ne7 Qe7 18.Qh6 fe4 19.Rfe1=+) 17.f4 Nd7 (17...Nc6 18.c4=) 18.f5+= Ne5 19.Qh6 Bf8 20.Qf4 (20.Qd2 g5 21.Nf3 Bb7+=) 20...Be7 (better 20...g5!? 21.Qd2 gh4 22.Qa5 Bb7 23.Nc7 Ke7–/+) 21.Rab1 (21.Qd2 Bd8+=) 21...Rb1 (21...g5!? 22.Rb8 Qb8=) 22.Rb1+= 0–0?? (22...Bd8 23.Qh6 Qf8 24.Qc1+=) 23.Bf3 (better 23.Rb6 Qd8 24.Ra6 g5+–) 23...Rb8?? (better 23...Qd8 24.Qd2 a4=) 24.Rb8+– Qb8 25.Ne7 Kh8 (25...Kg7 26.fg6 Qb1 27.Kf2 Qc2 28.Kg3 fg6 29.Nef5 Kf7 30.Qh6+–) 26.fg6 (better 26.Qh6 Qe8 27.fg6 fg6 28.Nhg6 Ng6 29.Ng6 Qg6 30.Qf8 Qg8 31.Qf6 Qg7 32.Qa6+–) 26...Qb1 (26...Nf3 27.Qf3 Qb1 28.Qf1 Qf1 29.Kf1 fg6+–) 27.Kf2 Qc2 28.Kg3 Ng6 29.Qf6 1–0. alt20 – tanczi, lichess.org, 2015.

4.e3 Qd6 5.Nf3 Nd7 6.c4 Ngf6 7.bc6 bc6 8.cd5 Nd5 9.Nc3 (9.Na3 Nb4+=) 9...Rb8 10.Rb1 e5 11.Ba1 Rb1 12.Qb1 Be7 13.Be2 0–0 14.0–0 N5f6 (14...f5 15.Rc1=) 15.Ne4 Qc7 16.Bc4 Ne4 17.Qe4 The pressure on e5 grows 17...Bd6 18.Ng5 Nf6 19.Qc2 h6 20.Ne4 Ne4 21.Qe4 Kh8 22.Bc3 f5 23.Qb1 (23.Qh4 f4=) 23...e4 (23...f4 24.ef4 Rf4 25.d3=) 24.g3 (24.h3 Bh2 25.Kh1 Be5=) 24...a4= 25.Qc2 a3 26.d3 Qe7 27.Rd1 Rd8 28.de4 fe4 (worse 28...Qe4 29.Qe4 fe4 30.Bb4+–) 29.Rd4 Bf5 30.Qd1 c5 31.Rd2 Be6 (31...Kh7 32.Ba5 Ra8 33.Rd6 Ra5 34.Qd5+–) 32.Ba5 Bc7 33.Be6 Rd2 34.Qd2 Ba5 35.Qd5 (worse 35.Qa5 Qe6 36.Qa3 Qc6+=) 35...Qe8 36.Qf5 Bc3 37.Bb3 Bb4 38.h4 Qa8 39.Bd5 Qd8 40.Be4 Qg8 41.h5 c4 42.Qb5 (42.Bd5 Qf8 43.Qf8 Bf8 44.Bc4 Bc5+–) 42...Be1 43.Kf1 (43.Qc5 Qf7 44.f3 Bg3 45.Qa3 Bb8+–) 43...Bd2 44.Bd5 Qf8 45.Ke2 c3 46.Qd7 Bc1 47.f4 Bb2 48.Qc6 Qb8 49.e4 Ba1 (49...Qd8+–) 50.e5 Qd8 51.Bc4 Bb2 52.Bd3 Kg8 (52...c2 53.Bc2 Ba1 54.Qe4+–) 53.Qe6 Kf8 54.Bc4 Qe8 55.Qg8 Ke7 56.Qg7 Kd8 57.Qh6 Qd7 58.Qb6 Ke7 59.Qf6 Ke8 60.e6 Qd1 61.Kf2 (61.Kf2 Qd4 62.Qd4 Kf8 63.Qf6 Kg8 64.Qh6 c2 65.e7) 1–0. Degterev,Pavel (2345) – Wernikiewicz,Zbigniew (2365), Yury Sakharov Memorial B, 2006.

4.e3 Nd7 5.f4 Ngf6 6.Nf3 g6 (6...a4 7.Be2=) 7.g4 Bg7 8.g5 Nh5 9.Bg7 Ng7 10.Nc3 a4 (10...h6 11.gh6 Rh6 12.Rb1=) 11.a3 (11.bc6 bc6 12.Nd4 Qc7=) 11...h6= 12.gh6 Rh6 13.Ra2 (13.bc6 bc6 14.Rb1 Nf5=) 13...Qc7 (13...Nf5 14.Bg2=) 14.Qa1 (14.bc6 bc6 (worse 14...Qc6 15.Bb5 Qd6 16.Qb1+=) 15.Rb2 e5=) 14...Nf5 15.Bd3 Nc5 16.Ne2 (16.Bf5 Bf5 (worse 16...gf5 17.Rg1+=) 17.Qb2 Qd6=+) 16...Nd3 17.cd3 cb5 18.Ned4 (better 18.Nfd4=+) 18...Bd7 (18...Nd4 19.Nd4 Bd7 20.Rc2=+) 19.Nf5 (better 19.Rc2!? Qa5 20.Nf5 Bf5 21.Qg7+–) 19...Bf5=+ (19...gf5?! 20.Qg7 0–0–0 21.Ra1=) 20.Kf2 (20.Qg7!? Qc1 21.Kf2 Qh1 22.Qh6–/+) 20...Kf8 (20...f6 21.Qb1 b4 22.Qb4 Bd3 23.Rb2–+) 21.Rc1 (21.Qd4 Qd6–/+) 21...Qd6 22.Qd4 Rc8 (22...Bg4 23.Qe5 Rh3 24.Ng1 Qe5 25.fe5–/+) 23.Rc8 Bc8 24.Rc2 (24.Rb2 Bd7 (24...Qa3?! 25.Rb5 f6 26.Qd5=) 25.Rb4 Rh5–/+) 24...Bd7 25.Rc5 (25.Qc5 Qc6–/+) 25...Bc6 26.Kg3 (26.h4 Rh5–/+) 26...e6 (26...Qd7 27.h4–/+) 27.h4 Qe7 (27...Ke7 28.Rc3 Rh5 29.Kf2–/+) 28.Rc3 (28.Kf2 Ke8=+) 28...Rh5 29.Ng5 (29.Qc5 f6–/+) 29...f6 30.Nf3 e5 31.fe5 fe5 32.Qg4 (32.Qc5 b4! 33.ab4 d4 34.ed4 Bf3 35.Qe7 Ke7 36.Kf3 Rh4 (worse 36...ed4 37.Rc7 Kd6 38.Rb7–/+) 37.de5 Ke6–/+) 32...Kg7 (better 32...Qd6!? 33.Ng5 Kg7–+) 33.d4–/+ Bd7 (33...e4!? 34.Ng5 Qd6 35.Kg2 Rh6=+) 34.Rc7= Bg4 35.Re7 Kf6 36.Rb7 Bf3 37.de5 Ke5 38.Kf3 Rh4 39.Rb5 Rh3 40.Ke2 (40.Kg2 Rh4+=) 40...Rh2= 41.Kd3 (41.Kd1 g5=) 41...g5 42.Rb4 (42.Ra5 Rh4=) 42...Rh4 43.Rb8 (43.Rb6 Re4=) 43...Rc4 (43...Kd6 44.Rg8 Rg4 45.Kc3=) 44.Re8 Kd6 45.Rd8 Ke6 46.Re8 Kd6 47.Rd8 Ke5 48.Re8 Kf5 49.Rf8 Kg4 (49...Ke6 50.Re8 Kf6 51.e4 Re4 52.Re4 de4 53.Ke4=) 50.Rd8+= Rc5 51.Ra8 Kf3 (51...Kh3 52.Kd4 Rb5 53.Ra4=) 52.Ra4 Rb5 (52...g4 53.Rf4 Kg3 54.Ke2+=) 53.Ra8+– g4 54.a4 (54.Rf8 Kg2 55.Ke2+=) 54...Rb4 (54...Rb3 55.Kc2 Ra3 56.Kb2=) 55.a5 (55.Rf8 Kg3 56.Rf4 Rb2+=) 55...g3 (55...Ra4 56.a6 g3 57.a7 Ra3 58.Kd4=) 56.a6 (56.Rf8!? Kg2 57.a6+=) 56...Ra4= 57.Rf8 Kg2 58.Rf6 Kg1 (58...Kh3 59.Rh6 Kg4 60.Rg6 Kh3 61.Ke2=) 59.Ke2 Ra2 (59...g2 60.Kf3 Ra2 61.Rb6=) 60.Rh6 (60.Rc6 g2=) 60...g2 61.Rg6 d4 (61...Kh1 62.Rh6 Kg1 63.Ke1=) 62.ed4+= Ra5 63.d5 Rd5 64.a7 Re5 (64...Re5 65.Kf3 Rf5 66.Kg4 Rf8=). FeegLood (2510) – chessBS_at_Twitch (2365), lichess.org, 2015.

4.e4 de4 5.c4 (5.f3 e6=+) 5...Nf6 6.a4 Bf5 7.Ne2 Nbd7 8.Ng3 Bg6 9.Be2 Nc5 10.0–0 e6 11.Nc3 Be7 12.Ba3 0–0 13.Rc1 Nd3 (13...Qd7 14.Rb1–+) 14.Ra1 (14.Be7 Qe7 15.Bd3 ed3–/+) 14...Ba3 (14...c5 15.Bd3 Qd3 16.Rc1–+) 15.Ra3 Qd6 16.Ra1 (16.Rb3 Nb4–/+) 16...Rad8–+ 17.f3? (17.bc6 bc6 18.Rb1 Ne5–+) 17...Ne5 (better 17...Qd4 18.Kh1 ef3 (18...Qc4?! 19.Bd3 Qd3 20.bc6–+) 19.Bf3 Nf2 20.Rf2 Qf2–+) 18.fe4 Qd2 (18...Qd4 19.Kh1–+) 19.Qd2 (better 19.Nd5! Qb2 20.Rb1=+) 19...Rd2–/+ 20.Rfd1 Rfd8 21.Rd2 Rd2 22.Rc1 Rd4 23.Kf2 Nfg4 (23...Nc4 24.h4 h5 25.bc6 bc6 26.Rd1 Rd1 27.Nd1–+) 24.Bg4 Ng4 25.Kf3 (25.Ke2 Rc4 26.bc6 bc6–+) 25...h5 (25...Nh2 26.Kf4 Rc4 27.bc6 bc6 28.Nce2 Ra4 29.Rc6–+) 26.h3 (26.Nf1 Rc4 27.Nd2 Rd4–+ (27...Nh2?! 28.Kg3 Nf1 29.Nf1=+)) 26...Ne5 (26...Rd3!? 27.Ke2 Rg3 28.hg4 Rg2 29.Ke3 Rg3 30.Kf2 Rg4 31.Rg1–+) 27.Ke3 White terminates the opponent with strong threats 27...Rd3 28.Kf2 Rd2 (28...Nc4 29.bc6 bc6 30.Nce2–+) 29.Nce2 (29.Nge2 c5–+ (worse 29...Nc4 30.bc6 bc6 31.Nb1–/+)) 29...Nd3 (29...Ra2 30.bc6 bc6 31.Ke3–+) 30.Ke3 Re2?? (better 30...Nc1 31.Kd2 Ne2 32.bc6 bc6 (32...Ng3?? 33.cb7 Ne4 34.Ke3+–) 33.Ne2 Be4–+) 31.Ne2+= Nc1 32.Nc1 c5? (32...cb5 33.cb5 f6+–) 33.Nb3 b6 34.Nc5! (34.Nc5 Kf8 35.Nd7 Ke7 36.Nb6+–) 1–0. BeepBeepImAJeep (2650) – kirill_kopyonkin (2485), lichess.org, 2019.

4.e4 Nf6 5.ed5= cd5 6.a4 Nbd7 7.Nf3 g6 8.Be2 Bg7 9.0–0 0–0 10.d4 Re8 11.Nbd2 Nb6 12.c4 dc4 13.Nc4 Black creates threats along the open c–file 13...Nc4 14.Bc4 e6 (14...Bf5 15.Ne5 e6 16.Qf3=) 15.Qb3 (15.Ne5 Nd5+=) 15...b6= 16.Rad1 Bb7 17.Ne5 Nd5 18.Be2 (18.Qf3 Qf6 19.Qf6 Bf6=) 18...Rc8 19.Bf3 Be5 (better 19...f6!? 20.Nc4 Bf8=) 20.de5+– Qe7 21.Ba3 (21.Rd4!?+–) 21...Qg5= 22.Bd6?? (better 22.Qb2=) 22...Rc3–+ 23.Qc3 Nc3 24.Bb7 Na4 (better 24...Nd1 25.Rd1 Qf4–+) 25.Bc6 Rd8 26.Ra1 Nc3 27.Bc7 Rd2 28.Bb6 Nd5 29.Ba5 Nf4?? (better 29...Rc2=+) 30.Bd2+– Ne2 31.Kh1 Qd2 32.b6 Qb4 (32...Nd4 33.Be4 Qf4 34.b7 Qe4 35.b8Q Kg7 36.Rfd1+–) 33.b7 Nd4 34.Rab1 Nc6 1–0. BeepBeepImAJeep (2585) – Paanoos (2325), lichess.org, 2016.

4.Nf3 Bg4 5.e3 (5.Nc3 Nf6 6.h3 Bf3 7.ef3 e6=) 5...Nf6 6.Be2 (6.h3 Bf3 7.Qf3 e6+=) 6...e6 7.c4 (7.Nc3 Bd6=) 7...Be7 8.a4 0–0 9.0–0 Qc7 10.d4 (10.cd5 ed5 11.Be5 Qc8+=) 10...Bf3 (10...Nbd7 11.Nbd2=) 11.Bf3+= Nbd7 12.c5 (12.bc6 bc6 13.Qc2 Rab8+=) 12...b6 13.bc6 (13.cb6!? Nb6 14.Qc2=) 13...Qc6= 14.cb6 Qb6 15.Ba3 (15.Ra2 Rfc8=) 15...Ba3 (15...Bb4!?=+) 16.Na3= Rfc8 17.Nb5 Nb8 18.Rc1 Na6 19.Qd2 Nb4 20.Rc8 Rc8 21.Rc1 Qd8 22.h3 g6 23.g3 Ne4 24.Be4 1–0. samyaksamadhi – sasikumar, net–chess.com, 2019.

4.bc6 Nc6

5.d4 Qb6–/+ 6.Nf3?? (better is 6.Bc3–/+) 6...Qb2–+ 7.Nbd2 Nb4 8.e3 (8.Rc1 Bd7 9.a3 Qa3 10.c4–+) 8...Nc2 9.Ke2 Na1 (9...Qb5!? 10.Nc4 Qc4 11.Kd2 Qb4 12.Ke2 Na1 13.Qa1–+) 10.a4 (10.Qb1 Qb1 11.Nb1 Bd7–+) 10...Nf6 11.Ke1 Nc2 12.Ke2 Ne4 13.Ne4 de4 14.Nd2 Qc3 15.Ne4 Bg4 16.f3 Qe3 0–1. Yloenen,Olli – Belter,Edmund, EU/WS/O/022 ICCF, 2009.

5.e3 d4 6.Nf3 de3 7.fe3 b6 (7...Nf6 8.Bb5+=) 8.Bb5+/– Qd7?? (better is 8...Bd7+/–) 9.Ne5+– Qb7 (9...Ne5 10.Bd7 Nd7+–) 10.Bc6 Qc6 11.Nc6 Bb7 12.Qf3 f6 13.d4 Rd8 14.0–0 Rc8 15.d5 e6 16.Qe4 e5 17.Qa4 Kf7 18.Nd2 Ne7 19.Ne7 Be7 20.Qd7 Ba6 21.c4 Rhd8 22.Qe6 Kg6 23.Rac1 h5 24.e4 Kh7 25.Qf5 Kg8 26.Qh5 Bb4 27.Rfd1 Rd6 28.a3 Bc5 29.Kh1 Rc7 30.h3 b5 31.cb5 Bb5 32.Nb3 Be3 33.Rc7 Ba4 34.Rc8 (34.Rc8 Rd8 35.Rd8 Be8 36.Re8; 34.Qf7 Kh7 35.Qg7) 1–0. Fournier,Frederic – humemo, Active, 2007.

5.e3 e6 6.Nf3 Nf6 7.c4 Ne4 8.Nc3 Nc3 9.Bc3 f6 10.a3 Be7 11.Bd3 e5 12.cd5 Qd5 13.Qb1 g6 14.0–0 Nd8 (14...a4 15.Be4 Qb3 16.Bb2+=) 15.Rc1 Be6 16.Be4 Qd6 (16...Qb3 17.Bb2+/–) 17.Bb2 (17.d4 Qd7+/–) 17...Rc8 18.Rc8 Bc8 19.d4 f5 20.Bc2 (20.de5 Qb6 21.Bd3+–) 20...Qe6? (better is 20...e4!? 21.Ba4 Bd7 22.Bd7 Qd7+=) 21.de5 Nc6 22.Nd4 Qd5 (22...Nd4 23.ed4 Qc4 24.Bd3+–) 23.Bb3 Qc5 24.Qc1 Ne5? (24...Qb6+–) 25.Qc5 Bc5 26.Nf5! Bf5 27.Be5 (27.Be5 Rf8 28.Bg7+–) 1–0. Nyikos,Laszlo – Grassmehl,Gerhard (1765), Brandenburg–ch Seniors, 2005.

4.e3 a4

5.a3 e5 6.Be5 Bd6?? 7.Bg7+– Ne7 (7...Be5 8.Be5 Nf6 9.Nc3+–) 8.Bh8 Be6 9.Bb2 cb5 (9...Nd7 10.Nc3+–) 10.Bb5 Nbc6 11.Nf3 1–0. Akrapovik – A_Alexander, lichess.org, 2019.

5.c4 Bd7 6.Na3 e6 7.Be2 Nf6 8.Nb1 (8.Nf3 dc4 9.bc6 Bc6 (worse 9...bc6 10.Nc4 c5 11.Rb1+–) 10.Nc4 Be7=) 8...a3 (8...dc4 9.Bc4 cb5 10.Be2–/+) 9.Bd4 (9.Bf6 Qf6 10.Nc3 Bb4=+) 9...c5 (9...dc4!? 10.Bc4 cb5–/+) 10.Bf6 Qf6 11.Nc3 d4 12.ed4 cd4 13.Ne4 Qe5 14.d3 (14.Bd3 f5 15.Nf3 Qc7=) 14...f5 15.Nd2 Bb4 16.Ngf3 Qf6 17.0–0 h5 (17...e5!?=+) 18.Nb3 Bc3 19.Rb1 g5 20.Nc5 b6 (20...g4=) 21.Nb7 (better 21.Na4!? Ba5 22.Ne1+=) 21...e5=+ 22.Ne1? (22.c5 Be6 23.Nd6 Kd8=+) 22...g4 (22...Bc8 23.Bh5 Ke7 24.Bf3–+) 23.f3? (better 23.c5=+) 23...Ra7–+ 24.fg4 hg4 (24...Rb7?! 25.gf5 h4 26.Qa4–/+) 25.Bg4 Qh4?? (better 25...Rb7 26.Qf3 Qh4 27.Qb7 Qh2 28.Kf2 Qf4 29.Qf3 Qg4 30.Qg4 fg4–+) 26.Nd6+= Increases the pressure on f5 26...Kd8?? (better 26...Ke7 27.Nf5 Bf5 28.Rf5 Qh2 29.Kf2 Qh4 30.g3 Be1 31.Qe1 Qh2 32.Kf3 Nd7+–) 27.Nf7+– Ke7 28.Nh8 Qh8 (28...Qg4 29.Qg4 fg4 30.Ng6 Kd6 31.Rf8+–) 29.Bf5 Kd6 30.Bd7 Rd7 (30...Nd7 31.Rf7+–) 31.Qg4 (31.Qa4 Rc7+–) 31...Rg7 (31...Rh7 32.Nf3 Kc7 33.c5+–) 32.Qf5 (better 32.c5 Ke7 33.Qf5+–) 32...Qh6 (32...Nd7 33.Qe4+–) 33.Qf6 (better 33.Qf8 Kc7 34.Rf7 Rf7 35.Qh6+–) 33...Qf6 34.Rf6 Kc5 (34...Kc7+–) 35.Nf3 Re7 (35...e4 36.Rf5 Kd6 37.Rd5 Kc7 38.Nd4+–) 36.Rf5 (better 36.Rf8 e4 37.de4 Rb7+–) 36...Kd6 37.Rf6 Kd7?? (37...Kc5 38.Ng5 e4+–) 38.Rb6+– e4 (38...Kc7 39.c5 e4 40.de4 Re4 41.Rb3+–) 39.Rb8 ed3 (39...Kc7 40.Ra8 Kb7 41.Ra3 ef3 42.gf3 Re5+–) 40.Rb7 Kd6 41.Re7 Ke7 42.Ne5 d2 43.Rd1 (better 43.b6!? Bb2 44.Rf1 d1Q 45.Rd1 Kd6+–) 43...Ke6 44.Nf3 Kf5 45.Nd2 (better 45.b6 Bb4+–) 45...Bd2 46.Rd2 Ke4 47.Kf1 Ke3 48.Ke1 d3 (48...Kf4 49.Rd4 Kf5 50.b6 Kg5 51.b7 Kg6 52.b8Q Kf6 53.Qf8 Kg5 54.Qe7 Kg6 55.g4 Kh6 56.Rd6) 49.b6 Kd4 50.b7 Kc4 (50...Ke5 51.b8Q Kd4 52.Qb5 Kc3 53.Qd5 Kb4 54.Rd3 Ka4 55.Qb5) 51.b8Q Kc3 (51...Kd5 52.Rd3 Ke6 53.Qd6 Kf7 54.g4 Kg8 55.Qe7 Kh8 56.Rd8) 52.Qb3 (52.Qe5 Kc4 53.Rf2 d2 54.Kd2 Kb4 55.Rf4) 52...Kd4 53.Qd3 Ke5 (53...Kc5 54.Qd6 Kc4 55.Rc2 Kb5 56.Rc5 Ka4 57.Qd4) 54.Re2 (54.Qd6 Ke4 55.Rd5 Ke3 56.Qe5) 54...Kf4 (54...Kf6 55.Qd6 Kf5 56.Re5 Kg4 57.Qd4) 55.Qf3 (55.Qd5 Kg4 56.Re4) 55...Kg5 56.Re5 (56.Re6 Kh4 57.g3 Kg5 58.h4) 56...Kh4 (56...Kg6 57.Qf5 Kh6 58.Qg4 Kh7 59.Rh5) 57.Qg3 (57.Qe4) 1–0. Atotheking (1705) – Predator_X (1775), lichess.org, 2020.

4.e3 cb5

5.Bb5 Bd7 6.Be2 Qb6 7.Bd4 Qe6 8.Nf3 Nf6 9.0–0 (9.Nc3 Ne4+–) 9...h6 (9...Nc6 10.Nc3 Nd4 11.Nd4+=) 10.c4 (10.Nc3 Bc6+–) 10...g5? (better 10...Nc6+=) 11.Nc3 Nc6?? (better 11...dc4 12.Ne5 b5+–) 12.cd5 Nd5 (12...Qf5 13.e4! Qh7 14.dc6 Bc6 15.Bf6 ef6 16.Bb5+–) 13.Nd5 (13.Bh8!? Nc3 14.Bc3 g4+–) 13...Qd5 14.Bh8 f6 15.Nd4 Qg8 (15...Nd4 16.ed4 Bc6 17.Bh5 Kd8 18.Bf3+–) 16.Bh5 Kd8 17.Nc6 (17.Qb3 Qb3 18.Nb3 b6+–) 17...bc6 (17...Bc6 18.Bf3 Qh8 19.Bc6 bc6+–) 18.Qb3 Qh8 (18...Qb3 19.ab3 Be6+–) 19.Qb6 Kc8 20.Rab1 (20.Rab1 e6 21.Qb7 Kd8 22.Qa8 Ke7 23.Qa5+–) 1–0. BeepBeepImAJeep (2655) – bedbreadcrumb (2005), lichess.org, 2017.

5.Bb5 Bd7 6.Be2 Nc6 (6...Qb6 7.Bd4 Qd6 8.Nc3+=) 7.Nf3 f6 (7...e6 8.0–0+=) 8.a4 (8.Nc3 Bc8+=) 8...e5= 9.0–0 Be6 10.d4 e4 11.Nfd2 f5 12.c4 Nf6 13.Nc3 Bb4 14.Qb3 Ne7 (14...Rc8 15.c5=) 15.cd5 (15.Ba3 dc4 16.Bc4 Bc3 17.Qc3 Rc8+–) 15...Ned5= 16.Rfc1 0–0 17.Nf1 (17.Bc4 Rc8=) 17...Qd7 18.Bb5 Qf7 19.Bc4 Rac8 20.Nd5 Nd5 21.Qa2 (21.Ng3 Bd2 22.Rcb1 Rc6=+) 21...Rc4 22.Qc4 Ne3 23.Qe2 (23.Ne3 Bc4) 23...Nc4 (23...Nd5 24.Ba3=) 24.Bc3 Bd5 (24...Bd6 25.Ne3=) 25.Ne3 (25.Bb4!? ab4 26.Rab1+–) 25...Ne3+= 26.fe3 Bd6 Black plans f4 27.Rf1?? (better 27.Ba5 f4 28.ef4 Qf4 29.g3+–) 27...Bc4–/+ 28.Qf2 (28.Qb2 Bf1 29.Rf1 Qc7–/+) 28...Bf1–+ 29.Rf1 Qc4 30.Qb2? (30.Ba5 Qa4 31.Bd2 b5–+) 30...f4 (30...Bh2 31.Kh2 Qf1 32.Qb7–+) 31.ef4?? (better 31.Ba5 fe3 32.Rf8 Kf8 33.Qc3 Qa4 34.Qc8 Ke7 35.Qb7 Kf6 36.Bd8 Ke6 37.d5 Ke5 38.Qg7 Kd5 39.Qf7 Kc5 40.Qf5 Kc6 41.Qc8 Kd5 42.Qf5 Be5 43.Qf7 Kd4 44.Qf1–+) 31...Bf4–+ (31...Rf4?! 32.Re1–/+) 32.d5 (32.Rf4 Rf4 33.Qc1–+) 32…Be3 (32...Be3 33.Qf2 Rf2 34.Rf2 Qe2 35.h3 Qf2 36.Kh2 Bf4 37.Kh1 Qf1) 0–1. BeepBeepImAJeep (2740) – promove2500 (2795), lichess.org, 2020.

4.e3 e6

5.c4 Nf6 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c6 5.c4 a5).

5.d4 Nf6 6.Nf3 cb5 7.Bb5 Bd7 8.Bd3 Be7 9.0–0 Nc6 10.a4 0–0 11.Nbd2 Rc8 12.c3 Qc7 13.Rb1 Rfd8 14.Qb3 Nb8 15.Rfc1 Bc6 16.c4 Nbd7 17.Ba3 Ba3 18.Qa3 Qb8 19.cd5 Bd5 20.Re1 b6 21.e4 Bc6 22.Nc4 Ne4 23.Na5 Bd5 24.Re4 Be4 25.Be4 Qf4 26.Bb7 ba5 27.Bc8= Rc8 28.g3 Qc7 29.Qe7 h6 30.Rb5 Ne5 31.Qc7 Nf3 32.Kg2 Ne1 33.Kf1 Rc7 34.Ke1 Rd7 ½–½. Deline – Poschmann,Hans, email 4AMM–06, 1997.

5.Nf3 Nf6 6.d4 Be7 7.c4 0–0 8.Nc3 a4 (8...cb5 9.Nb5 Bd7 10.Rc1=) 9.Na4+= Qa5 Black launches an attack 10.Nc3 Bb4 11.Qc2 Ne4 12.Rc1 Qa2 13.cd5 (13.Nd2 Nc3 14.Bc3 Qc2 15.Rc2 Bc3 16.Rc3 dc4 17.bc6 Nc6 18.Rc4 Rd8=) 13...ed5 14.bc6 (14.Nd2!? Bc3 15.Bc3=) 14...Ra3–/+ (worse is 14...bc6 15.Nd2 Nc3 16.Bc3 Qc2 17.Rc2=) 15.Ba3 Bc3 16.Kd1 Qa3 17.Bd3 (17.Ng5 Ng5 18.c7 Bg4 19.f3 Nf3 20.gf3 Bf3 21.Be2 Bh1 22.cb8Q Rb8 23.Qc3 Qc3 24.Rc3 h6–+) 17...Bb2 (17...Nc6?! 18.Be4 de4 19.Qc3 Qc3 20.Rc3 ef3 21.gf3+=) 18.c7 (better is 18.Be4!? de4 19.c7–/+) 18...Nc6–+ 19.Be4 de4 (19...Bc1?! 20.Bh7 Kh8 21.Qc1 Qc1 22.Kc1 Kh7 23.Kd2=) 20.Rb1 ef3 21.Rb2 fg2 22.Rg1 Re8 23.Rg2 Nd4! (23...Nd4 24.ed4 Qf3 25.Qe2 Re2 26.Re2 Qd3 27.Ke1 Qc3 28.Kf1 Bd7–+) 0–1. Ventimiglia,Charles – Wenger,Joseph, CL4–1998.23, 1998.

5.Nf3 Nf6 6.Be2 cb5 7.Bb5 Bd7 8.Be2 Nc6 9.c4 (9.Nc3 Be7=) 9...dc4 10.Bc4 a4 (10...Bd6 11.0–0=) 11.Na3 (11.0–0 Bd6=) 11...Be7 12.0–0 0–0 13.d4 Qa5 14.Qe2 Rfc8 15.Rfd1 Ne4 (15...Qh5 16.Ne5 Qh4 17.Nd7 Nd7 18.d5 ed5 19.Bd5=) 16.Bd3 Nf6 17.e4 (17.Ne5 Ne5 18.de5 Nd5+=) 17...Nb4 18.Nc4 (18.Ne5 Nd3 19.Qd3 Bc6 20.Nc6 Rc6=) 18...Qd8 19.Nfe5 (19.Nce5!?=) 19...Nd3 (19...Bb5!? 20.Rab1 Nd3 21.Qd3 Ne4 22.Qe4 Bc4 (22...Rc4?! 23.Ba3 Ba3 24.Rb5=) 23.Nc4 Rc4–/+) 20.Qd3= (worse is 20.Rd3 b5 21.Ne3 a3–/+). Roldan,Antonio Jose (2040) – Kulczycki,Michael (1860), IECC, 1998.

4.e3 Bf5

5.Nf3 Nd7 6.c4 Nc5 7.d4 Ne4 8.Nc3 e6 9.c5 a4 10.Rc1 a3 11.Ba1 Ngf6 12.Be2 g5 (12...Be7 13.0–0+=) 13.bc6 bc6 14.Ne5 Nc3 15.Bc3 Qc7 16.Qb3 Nd7 17.Nd7 Kd7 18.0–0 h5 19.f4 Bg4 20.Qd1 f5 21.fg5 Be7 22.h4 Qg3 23.Bg4 (better is 23.Qe1 Qe3 24.Rf2=) 23...Qe3–/+ 24.Kh2 (better is 24.Rf2!? hg4 25.Qe1 Qe1 26.Re1 Rh4 27.Rfe2–/+) 24...hg4–+ 25.g3? (25.Qe1 Bg5 26.Qe3 Be3–+) 25...Bg5 (25...Rh4 26.Kg2 Qe4 27.Qf3 gf3 28.Rf3 Qe2 29.Rf2 Rh2 30.Kh2 Qf2 31.Kh3 Rh8) 26.Qe1 (26.Qb3 Bh4! 27.Qb7 Ke8 28.Qc6 Kf8 29.Qa8 Bd8 30.Kg2 Qe4 31.Kg1 Rh1 32.Kf2 Rh2 33.Kg1 Qg2) 26...Qc1 (better is 26...Rh4! 27.gh4 Qh3 28.Kg1 Be3 29.Rf2–+) 27.Qc1 Bc1 28.Rc1 Rab8 29.Rf1 Rb7 30.Rf2 (30.Kg2 Rh5–+) 30...Rb1 (30...Rhb8 31.Kg2–+) 31.Kg2 Rc1 (better is 31...Rhb8 32.h5 Rc1 33.Bd2–+) 32.Bb4 Ra8 33.Re2 Ra4 (33...Ra4 34.Bd2 Rc2–+) 0–1. Hibbitt,Arthur M (1895) – Auckland,Elliott (1875), BCF–chT4, 2007.

5.Nf3 e6 6.a4 Nf6 7.Be2 Bd6 8.0–0 0–0 9.c4 (9.Nh4 Be4=) 9...Qe7 10.d4 Nbd7 11.Ne5 c5 12.f4 (12.Nd7 Nd7 13.cd5 Rac8+=) 12...Bb1 (12...Rac8!?+=) 13.Rb1= Nb6 14.Bd3 Ne4 15.Be4 de4 16.Qb3 Qh4 17.Ba3 Rac8 18.dc5 Bc5 19.Bc5 Rc5 20.Rbd1 Rfc8 21.Nd7 Nd7 22.Rd7 Rc4 23.Rb7 Rc1 24.Rd1?? (better is 24.Rd7 Rf1 25.Kf1+=) 24...Qd8–+ 25.Rc1 (25.h3 Rd1 26.Kh2–+) 25...Rc1 26.Kf2 Qh4 (26...Qh4 27.g3 Qh2) 0–1. Schnell,Manfred – Hempel,Manfred (2100), Hessenliga, 2008.

5.Nf3 e6 6.c4 Nf6 7.Nc3 Bg4 8.h3 Bh5 9.g4 Bg6 10.d4 Bb4 11.a3 Bd6 (11...Bc3 12.Bc3 dc4 13.Bc4=) 12.c5+= Be7 13.Bd3 (13.Ne5 0–0+–) 13...0–0 14.Ne5 Ne4?? (better 14...Bd3 15.Qd3 Nfd7 16.Nd7 Nd7=) 15.Ng6+– fg6 16.Ne4 de4 17.Be4 Bh4 18.0–0 Qc7 19.b6?? (better 19.f4 Qe7 20.Rc1+–) 19...Bf2= 20.Kh1 Qg3 21.Bg2 Qe3 (21...Nd7 22.Qb3 Rae8 23.Qc3=) 22.Qc2 (better 22.a4!? Bh4 23.Rf8 Kf8 24.Ra3+–) 22...Rf3 23.Rf2?? (better 23.Qc3! Qc3 24.Bc3 Rc3 25.Rf2=+) 23...Rf2–+ (23...Qf2?! 24.Rc1 Rf6 25.Qc3–/+) 24.Qc3 Qe2 25.d5 (25.Re1 Qb2 (25...Rg2 26.Re2 Re2 27.Qc4 Re1 28.Kg2+=) 26.Qb2 Rb2 27.Re6 Nd7–+) 25...Qb2 26.Qb2 Rb2 27.de6 Re2 (27...Na6!? 28.Rc1–+) 28.Bf1 Re5 (better 28...Rc2 29.Re1 Kf8 30.a4–+) 29.Bc4 Kf8 30.Rf1 Ke8 31.Rf7 Re1 (better 31...Na6 32.Rb7 Nc5 33.Rg7 Rd8–+ (33...Ne6?! 34.b7 Rd8 35.Be6–/+)) 32.Bf1?? (32.Kg2!? Rc1 33.Rb7 Rc2 34.Kf3 Rc4 35.Ra7 Rc3 36.Ke4 Rc4 37.Ke3 Rc5 38.Ra8+–) 32...Rc1 (better 32...Na6 33.Kg2 Nc5 34.Rg7 Rd8–+) 33.Kg2 Na6 (33...Rc2 34.Kf3 Rc3 (34...Rc5?! 35.Rb7 Rc1 36.Bd3–/+) 35.Kf2 Na6 36.Rg7 Rd8 37.Ba6 Rd2 (37...ba6?! 38.b7 Rb3 39.Ke2–/+) 38.Be2 Rcc2 (worse 38...Ra3 39.Rb7 Rh3 40.Rg7 Rh2 41.Kf3 Rde2 42.b7–+) 39.Rb7 Re2 40.Kf3 Re6 41.Rh7 Rc3 (41...Rc5?! 42.Rh8 Ke7 43.b7=) 42.Kf4 Kd8–+ (42...Ra3?! 43.Rh8 Kf7 44.b7 Ra4 45.Kf3–/+; 42...Rc5?! 43.Rh8 Kf7 44.b7=+)) 34.Rb7?? (better 34.Rg7 Rd8 35.Ba6 ba6 36.b7–+) 34...Nc5 35.Rg7 Ne6 36.Rh7 Rb8 37.b7 c5 (better 37...Rb1 38.Bc4 Nf8 39.Bf7 Kd8–+) 38.Bb5= Kd8 39.Rd7 Ke8 40.Rc7 Kd8 41.Rd7 Ke8 42.Rd1 Ke7 43.Rc1 Rb7 44.a4 (44.Bc4 Nd4=) 44...Kd6=+ 45.Kg3 Nd4 46.Rd1 Kd5 (46...Ke5 47.Re1 Kd5 48.Rd1–/+) 47.h4 (47.Kf4 Ke6=) 47...Rb6 48.Kf4 c4 49.Kg5 White prepares the advance h5 (49.h5!? gh5 50.gh5=+) 49...Kc5–/+ 50.h5 gh5 51.gh5 Nb5 52.ab5 Rb5 53.h6 Kb4 54.Kg4 Rc5 55.Rb1 Ka3 56.h7 Rc8 57.Ra1 Kb4 58.Kf4?? (better 58.Rh1=) 58...c3–+ 59.Ke3? (59.Kf5 c2 60.Rg1 a4 61.Rg4 Kb3 62.Rg3 Ka2–+) 59...Rh8 (better 59...c2–+) 60.Rb1 Kc4 61.Rb7 a4 62.Rc7 Kb3 63.Rb7 Kc2 64.Ra7 a3! 65.Ra3 (65.Ke2–+) 65...Rh7 66.Ra8 Re7 67.Kf2 Rb7 68.Ke2 Kb2 69.Rc8 c2 70.Kd2 c1Q! (70...c1Q 71.Rc1 Rd7 72.Ke3 Kc1–+) 0–1. Williams,Barry – Gloistein,Bruce, South Island Championship B NZL, 1999.

5.Nf3 e6 6.c4 Nf6 7.Nd4 Bg6 8.bc6 Nc6 (8...bc6 9.cd5 ed5 10.f4 Bc5 11.Be2 Be4 12.d3 Bg6 13.f5 Bd4 14.Bd4= 0.19) 9.Qa4 (9.cd5 Nd5 10.Qa4 Qd7 11.Bb5 Nb6 12.Qd1 e5 13.Nf3 f6 14.d4= 0.00; 9.Nc6 bc6 10.Qa4 Nd7 11.Ba3 Rb8 12.Bf8 Rf8 13.Nc3 Qb6 14.cd5= –0.09) 9...Qb6 10.Nb3 (10.Nb5 Be7 11.cd5 ed5 12.Bd4 Qd8 13.Be2 0–0 14.0–0+= –0.37) 10...Qb4 11.Qb4 (11.Nc3 Rc8 12.Rc1 Qa4 13.Na4 Nb4 14.Bf6= 0.00) 11...Nb4 12.Na3 dc4 (12...Nd3 13.Bd3 Bd3 14.cd5–/+ –0.87) 13.Bc4 Bd3 14.Bf6 (14.Bb5+= –0.59) 14...gf6 15.Bd3 Nd3 16.Ke2 Ba3 17.Kd3 Rd8 18.Ke2 a4 19.Na5 b5 20.Rab1 Rd5 21.e4 Re5 22.f3 Kd7 23.d4 Rg5 24.g4 Rb8 25.Nc4 Be7 26.Rhd1 Rgg8 27.Ne3 Rgc8 28.d5 e5 29.Nf5 Ba3 30.Nh6 b4 31.Nf7 Rc2 32.Rd2 b3 33.ab3 ab3 34.Kd1 Rc3 35.g5 Rf3 36.Ke2= Rc3?? 37.Rd3?? Rc2?? 38.Kd1+/– Rb2 39.Ra1?? Rh2–+ 40.Ra3 b2 41.Ra7 Ke8 42.Nd6 Kf8 (42...Kf8 43.Rf7 Kg8 44.Rg7 Kg7 45.Nf5 Kf8 46.Rc3 b1Q 47.Rc1 Qd3 48.Ke1 Qe2) 0–1. Zak,Pawel – Kwiatkowski,Wiktor, Rubinstein Polanica Zdroj Poland, 2010.

5.g4 Be4 6.Nf3 Qc8 7.Rg1 Nh6 8.Nc3 Ng4 9.Ng5 Nf6 (9...Nh2 10.Qh5 Nf3 11.Nf3 Bc2 12.d3+–) 10.Nce4+= de4 (10...Ne4!? 11.Ne4 de4=) 11.Bc4+– Nd5 (11...e6 12.Bf6 gf6 13.Be6+– (13.Ne4?! Qd8+–)) 12.Nf7 (12.Nf7 Kf7 13.Qh5 g6 14.bc6 Nc6 15.Qd5 e6 16.Qe4+–) 1–0. forsetinn (2215) – nextdoor (1710), gameknot.com, 2014.

3.Bb2 Bd7

4.a4 c5 5.c4 d4 6.e3 e5 7.g3 (7.Qe2 Be6=) 7...b6 (7...Nf6 8.Bg2 Bg4 9.Qb3=) 8.Bg2= Ra7 9.Ne2 (9.Nf3 Bd6=) 9...Be6 10.Na3 Bd6 11.0–0 Nf6 12.f4 d3 13.Nc3 (better 13.fe5!? Bg4 A) worse 14.ef6 de2 15.fg7 Rg8=+ (15...ed1R?? 16.gh8Q Kd7 17.Qd8 Kd8 18.Rad1+–; 15...ef1Q? 16.Kf1 Rg8 17.Qg4+–); B) 14.ed6? de2 15.Qc2 ef1R 16.Rf1 Qd6–+; C) 14.Bf3 Bf3 15.Rf3 de2 16.Qe2 Be5 17.Be5+–) 13...Bg4= 14.Bf3 (14.Qb3 ef4 15.ef4 Re7+=) 14...h5+= 15.h4 (15.Nd5 Nd5 16.cd5 ef4 17.ef4 Bf8+=) 15...0–0 (15...e4 16.Bg4 hg4 17.Rc1=+) 16.Nd5= Ne4 (16...Nd5!? 17.fe5 Bf3 18.Qf3 Nb4 19.ed6 Qd6=) 17.Bg4+= Ng3 18.fe5 Qh4 19.Kg2?? (better 19.Rf4 Qh1 20.Kf2 Qh2 21.Kf3=) 19...hg4–/+ 20.ed6?? (better 20.Rh1 Nh1 21.Qh1–/+) 20...Qh3 21.Kf2 Qh2 22.Ke1 Nf1 (22...Qg2 23.Qf3 gf3 24.Ne7 Re7 25.Rf2 Qg1 26.Rf1 Qf1) 23.Kf1= g3 (23...f5 24.Nf4 Rd7–/+) 24.Qf3+= Qh3? (better 24...Re8!?+=) 25.Qg2+– Qf5 (25...Qf5 26.Kg1 Qg4+–) 0–1. GuestXWMZ – GuestTMGT, freechess.org, 2017.

4.a4 e5 5.e3 (better 5.Be5!? Bf5 6.b6+=) 5...Bd6= 6.Nf3 Qe7 7.c4 e4?? (better 7...Nf6=) 8.Bg7+– (8.cd5 ef3 9.Qf3 f6–/+) 8...ef3 9.Qf3 (better 9.Bh8 fg2 10.Bg2 dc4 11.Bb7+–) 9...Be5+– 10.Bh8 Bh8 11.d4 (11.Nc3 Bc3 12.dc3 Qe5+–) 11...Nh6?? (11...Bd4 12.Ra2 Nf6–+) 12.cd5+– (12.Qd5?! c6 13.Qh5 Bd4=) 12...c6 (12...Bd4 13.d6! Qe5+=) 13.dc6+– bc6 14.Nd2 (better 14.Be2+–) 14...cb5?? (better 14...Bd4 15.Rc1 Ng4+–) 15.Bb5 (15.Qa8!? Qd8 16.ab5 Ng4+–) 15...Bb5 (15...Ra7 16.Qf4 Rb7+–) 16.Qa8 Qc7 (16...Bc6 17.Qb8 Qd8 18.Qd8 Kd8 19.0–0+–) 17.ab5 Bf6 18.0–0 Ke7 (18...Ng8 19.Qa5 Qa5 20.Ra5+–) 19.Rfc1 Nd7 1–0. RichardSommer (2120) – UnclePS (2025), lichess.org, 2020.

4.a4 Bf5 5.Nf3 f6 6.Nd4 Bg6 (6...Bg4 7.f3 Bc8 8.e4=) 7.g3 (7.Ne6 Qd6 8.Nf8 Kf8+=) 7...e5 (7...Qd7 8.h4 e5 9.Bh3=) 8.Ne6 Qd6 9.Bh3 f5 (better 9...c5=) 10.Nf8+– Qf8 11.Be5 1–0. Janek – zandar, internet, 2017.

4.e3 a4 5.Nf3 e6 6.Bd3 Nf6 7.0–0 Bd6 8.c4 c6 9.cd5 ed5 10.Qc2 (10.bc6 Nc6 11.Na3 0–0=) 10...0–0 (10...c5 11.e4 de4 12.Be4 Bb5 13.Bb7=) 11.Bd4+= cb5 12.Nc3 b4 13.Bf6 Qf6 14.Bh7 Kh8 15.Nd5 Qh6 16.Bf5 Bc6 17.e4 g6 18.Bh3 Nd7? (better 18...Bd5!? 19.ed5 Qh5+–) 19.Nb4!+– Rac8?? (19...Bb4 20.Qb2 Double attack (20.Qb2 Decoy)) 20.Nc6 Rc6 21.Qb2 White intends e5 21...Ne5 (21...f6 22.Bd7 Rc7 23.Qb5+–) 22.Ne5 Qg7 23.d4 Rfc8 (23...Be5 24.de5 Rc4+–) 24.Nc6 Rc6 25.e5 Bc7 (25...Bf8 26.Qb7 Rc4 27.Qd5+–) 26.Qb7 Kh7 27.Qc6 (27.Qc6 Be5 28.de5 Qe5 29.Qa4+–) 1–0. Janek – Henry, internet, 2016.

4.e3 c5 5.c4 (5.Nf3 Nf6+=) 5...e6 6.Nf3 Nf6 7.a4 (7.Nc3 Bd6+=) 7...Be7 8.Be2 0–0 (8...dc4 9.Bc4 0–0 10.d4+=) 9.0–0 b6 (9...Qc8 10.Qc2+=) 10.d4 dc4 (10...Bc8 11.dc5 Bc5 12.cd5 Nd5 13.Nbd2+=) 11.Bc4 Qc7 (11...cd4 12.Qd4 Bc8 13.Rd1+=) 12.Nbd2 Rd8 13.Rc1 Nd5 (13...Bc8 14.dc5 bc5 15.Bf6 Bf6 16.Qc2+=) 14.dc5 Bc5 (14...bc5 15.Qc2+/–) 15.Bd5 ed5 16.Be5 (16.Nb3 Bg4+/–) 16...Qb7 17.Nb3 Bb4?? (better is 17...Rc8+/–) 18.Rc7+– Ra7 (18...Bc8 19.Rb7 Bb7+–) 19.Rb7 Rb7 20.Qd5 (20.Qd5 Ra7 21.Ng5+–) 1–0. Houthuijzen – Wartig,Wolfgang, corr SOK–96–119, 1996.

4.Nf3 Bb5=+ 5.a4 Ba6 6.g3 e6 7.Bg2 Bb4?? (better 7...Nf6–/+) 8.Bg7+– f6 9.Bh8 Qe7 10.0–0 (10.Nd4 Nd7+–) 10...Qf8 (10...Nh6 11.Nd4 Bc5 12.Nb3+–) 11.Nd4 Ne7 (11...Qf7+–) 12.Ne6 Qh8 13.Nc7 Kd8 (13...Kd7 14.Na8 Bc5 15.d4+–) 14.Na8 Nd7 (14...Qe8 15.c3 Bd6 16.Qb3+–) 15.c3 f5 (15...Bd6 16.Na3+–) 16.cb4 Qa1 17.b5 Bb5 18.ab5 Qe5 (18...Qb2 19.Qa4 b6 20.Qh4+–) 19.Qc2 (better 19.Qa4 b6+–) 19...Qb8 (19...d4 20.Qd3 b6 21.Bc6+–) 20.Qc3 Qa8 21.Qh8 (21.Qh8 Kc7 22.Qa8+–) 1–0. DEFFM – GuestGHZM, freechess.org, 2018.

4.a4 c6

5.e3 cb5 6.ab5 a4 7.Nf3 Qb6 (7...e6!?+–) 8.Nc3 e6 (8...Nf6 9.Ra4 Ra4 10.Na4+–) 9.Na4+– Bb5?? (better 9...Qd8+–) 10.Nb6 Bf1 11.Ra8 Bg2 12.Rb8 Ke7 13.Qa1 Nf6 (13...d4 14.Ba3 Kf6 15.Qd4 Kg6 16.Qg4 Kh6 17.Qg5) 14.Ba3 (14.Qa3) 1–0. DEFFM – GuestVRGZ, freechess.org, 2018.

5.e3 cb5 6.ab5 b6 7.Nf3 Nf6 8.Be2 g6 (8...e6 9.Nc3+=) 9.c4 Bg7 (9...dc4 10.Bc4 Bg7 11.d4+=) 10.cd5+– 0–0 11.Bf6 Bf6 12.Nc3 (12.d4 Qc7+–) 12...Bg4 (12...Qc7 13.0–0+=) 13.d4 Bf3 (13...Qc7 14.Rc1+–) 14.Bf3 (worse 14.gf3 Ra7+–) 14...Qd6 (14...Nd7 15.0–0+–) 15.0–0 Bh4 16.Ne4 Qd7 17.Qb3 Qc7? (better 17...Rc8+–) 18.g3 Bf6 (18...Qd7 19.gh4 Qh3 20.Bg2 Qh4 21.Rfc1+–) 19.d6! ed6 (19...Qa7 20.Nf6 ef6 21.Rfc1+–) 20.Nf6 Kg7 21.Rfc1 Qe7 22.Nh7 Kh7 23.Ba8 f5 24.h4 f4 25.ef4 Qe2 (25...Nd7 26.Bc6 Nb8+–) 26.Rc7 Kh6 27.Qd5 Qf3 28.Qg5 1–0. DEFFM – GuestXXYY, freechess.org, 2018.

5.e3 cb5 6.ab5 Bf5 7.c4 (7.Nf3 Qc7=) 7...e6 8.cd5 ed5 9.Nf3 Nf6 10.Be2 (10.Nc3 Bd6=) 10...Be7 (10...Bd6 11.Nd4 Be6 12.0–0+=) 11.Nc3 Nbd7 12.0–0 0–0 13.Nd4 Bg6 14.Bf3 Attacks the isolani on d5 (14.f4!? h6 15.f5+=) 14...Nc5 15.Nd5?? (better 15.Na4=) 15...Nd5–+ 16.Bd5 (16.Ba3 Re8–+) 16...Qd5 17.Nf3 (17.Ba3 Rfc8–+) 17...Be4 (17...Nb3 18.Ra4–+) 18.Ba3 (18.Nd4 Bf6 (18...Bg2?! 19.Qg4 Bf1 20.Nf5 Qg2 21.Qg2 Bg2 22.Ne7 Kh8 23.Kg2–+) 19.Qg4 a4–+) 18...Bf3 (better 18...Bd3!? 19.e4 Qh5 20.Re1–+) 19.Qf3 Qf3 20.gf3 Rac8?? (20...Rfe8 21.Bc5 Bc5 22.d4–+) 21.f4? (21.d4 b6=+) 21...Bf6 (better 21...Rfe8 22.Bc5 Rc5 (22...Bc5?! 23.Ra5 Bb6 24.Raa1–/+) 23.Ra5 b6–+) 22.Rac1?? (better 22.d4 b6 23.Rab1–/+) 22...Nd3–+ 23.Rb1 (23.Bf8 Nc1 24.Ba3–+) 23...b6 (better 23...Rfd8–+) 24.Bf8 Rf8 25.Rb3 Nc5 (25...Rd8!? 26.Kg2–+) 26.Rbb1 (26.Ra3 Ne4 27.Rd3 Rd8 28.Rd8 Bd8–/+) 26...a4 (26...Ne4 27.Rbd1–+) 27.Rfc1 (27.d4 Nb3 28.Rb2 Ra8–/+) 27...a3 (27...Nd3 28.Rc2 Ra8 29.Ra2–/+) 28.Rc2–/+ Ra8 29.Ra2 (better 29.d4 Kf8 30.dc5–/+) 29...Nd3 (better 29...Ne4!? 30.Rc1 Bb2–/+) 30.Rb3= White gets kings attack 30...Nc5 (better 30...Rd8!? 31.Raa3 Nc5=) 31.Rba3+– (31.Raa3?! Rd8 32.Rb4 Rd2=) 31...Ra3 32.Ra3 Do you see the mate threat? 32...Kf8 33.Ra8 Ke7 34.Ra7 Nd7 (34...Ke8 35.f3+–) 35.d4 Kd6 (35...g6 36.Kf1+–) 36.Kg2 Be7 (36...g6 37.Kf3+–) 37.Kf3 (better 37.e4 Bf8 38.e5 Ke7 39.f5+–) 37...Nf6? (better 37...f5+–) 38.e4+– Ne8 (38...Ng8+–) 39.e5 (39.e5 Ke6 40.f5 Kd5 41.Re7 Kd4 42.Re8+–) 1–0. RichardSommer (2055) – Lukas314 (2045), lichess.org, 2020.

5.e3 cb5 6.ab5 Nf6 7.Nf3 g6 (7...e6 8.Be2=) 8.Na3 (8.Bf6 ef6 9.Be2 Bd6+=) 8...Bg7= 9.Be2 0–0 10.0–0 Qb6 11.Rb1 (11.Bd4 Qd6+=) 11...Ne4 (11...Rc8 12.c4=) 12.Bg7+= Kg7 13.Rb2 (13.c4 a4+=) 13...Qc5 (13...Qf6 14.Ra2=) 14.Nb1 (14.Qa1 Kg8+=) 14...Nd6 b5 seems the pivot of the position (14...a4 15.d4 Qd6 16.Nfd2 Nd2 17.Qd2=) 15.d3 (15.Nc3 Kg8+=) 15...a4 (15...Bb5 16.d4 Be2 17.dc5 Bd1 18.Rd1=+) 16.c4 (16.d4 Qc8=) 16...a3 (16...dc4!? 17.dc4 Bg4=) 17.Ra2+= dc4 18.dc4 Nc4 19.Qd4 (19.Bc4 Qc4 20.Ra3 Ra3 21.Na3 Qc3=) 19...Qd4= 20.Nd4 (worse 20.ed4 Bb5 21.Nc3 Ba6–+) 20...e5 (20...Rc8 21.Bc4 Rc4 22.Ra3 (22.Na3? Rca4–+) 22...Ra3 23.Na3=) 21.Bc4+= ed4 22.ed4 (worse 22.Na3 Rc8 23.Bd5 Rc3=+) 22...Rd8? (better 22...Ra4!? 23.Na3 Rc8+=) 23.Ra3+– (23.Na3?! Be6 24.Be6 fe6+=) 23...Be6 (23...Ra3!? 24.Na3 Kf6+–) 24.Ra8 Bc4 25.Rd1 Bb5 26.Nc3 Ba6 27.d5 Kf6 28.h3 Ke7 (28...h5 29.d6 Ke5 30.g3+–) 29.d6! Kd7 (29...Rd6 30.Nd5 Double attack (30.Rb8 Deflection)) 30.Ne4 b5 (30...Bc4 31.Nf6 Ke6 32.Nh7 b5+–) 31.Nc5 Kc6 32.Na6 (32.Ra6?! Na6 33.Na6 Rd6 34.Nb4 Kc5 35.Nd3 Kd4 36.Nc1 Ke5 37.f4 Ke6+–) 32...Na6 (32...Rd6 33.Nb8 (33.Rb8?! Rd1 34.Kh2 Rd4+=) 33...Kb7 34.Rd6 Ka8 35.Rb6+–) 33.Ra6 (33.Rd8 Nc5 34.Rc8 Kb6 35.Rc5 Kb7 36.d7 f6 37.d8Q Ka6 38.Rd6 Kb7 39.Rc7) 33...Kc5 (33...Kb7 34.Rda1 b4+–) 34.d7 b4 35.Rf6 (better 35.Raa1 Kb5+–) 35...b3 36.Rf7 b2 37.Rh7 Kc4 38.Kf1 (38.Re7 g5+–) 38...Kc3 39.Rh4 (better 39.Re7 Kc2 40.Ke1 g5+–) 39...Kc2 (39...Rd7 40.Re1 (40.Rd7? b1Q 41.Ke2 Qb5 42.Ke3 Qd7–+) 40...Re7 41.Re7 b1Q 42.Re1 Qd3 43.Kg1+–) 40.Ke1 (better 40.Rhd4 b1Q 41.Rb1 Kb1 42.Rd2+–) 40...Rd7 41.Rc4 (41.Rd7? b1Q 42.Ke2 Qb5 43.Ke3 Qd7 44.Rc4 Kb2–+) 41...Kb3 42.Rcc1 (better 42.Rd7 b1Q 43.Rd1+–) 42...Rd1?? (42...bc1Q 43.Rc1 Rd6+–) 43.Rd1 Kc2 (43...Kc3 44.h4+–) 44.Ke2 b1Q (44...Kc3 45.Rb1+–) 45.Rb1 Kb1 (45...Kc3 46.Rb6 g5 47.Kf3+–) 46.Kf3 Kb2 47.Kf4 Kc3 48.Kg5 Kd2 49.f4 Ke3 50.g3 Kf3 51.g4 Kg3 52.h4 Kf3 53.h5 gh5 54.gh5 Ke4 55.h6 Kd5 56.h7 Ke6 57.h8Q Ke7 (57...Kd6 58.Qe5 Kc6 59.f5 Kb7 60.f6 Kb6 61.f7 Kb7 62.Qc5 Ka6 63.f8Q Kb7 64.Qfc8) 58.Qe5 (58.Qd4 Ke6 59.Qd8 Kf7 60.Qd7 Kf8 61.Kf6 Kg8 62.Qg7) 58...Kf7 (58...Kd7 59.f5 Kd8 60.Qd6 Kc8 61.f6 Kb7 62.f7 Ka7 63.f8Q Kb7 64.Qfb8) 59.Qd6 (59.f5 Kg8 60.f6 Kh8 61.Kg6 Kg8 62.Qe8) 59...Kg7 60.Qd7 Kf8 61.Kf6 Kg8 62.Qg7 1–0. Abdullaevich (1840) – NikeNem (1785), lichess.org, 2020.

5.e3 e6 6.Nf3 =.

5.e3 Nf6 6.c4 e6 7.Nf3 cb5 8.cb5 Bc8 9.Be2 b6 10.0–0 Bb7 11.Ne5 Bd6 12.f4 0–0 13.d4 Ne4 14.Nd2 Nd2 15.Qd2 f6 16.Nf3 Qe7 17.Rac1 Nd7 18.Rc2 e5 19.de5 fe5 20.fe5 Ne5 21.Ne5 Be5 22.Bf3 Rad8 23.Bd4 Qd6 24.g3 Rc8 25.Rc8 Rc8 26.Qf2 Bd4 27.ed4 Rf8 28.Qg2 Rd8 29.Qd2 Qa3 (Better is 29...Re8!?+=) 30.Qg5+– Qd6 31.Re1 Bc8 (Better is 31...h6 32.Qe7 Qe7 33.Re7 Ba8+/–) 32.Re7+– g6?? (32...Qg6 33.Bd5 Kh8 34.Qg6 hg6+–) 33.Bd5!! Kh8 34.Re5 Qf8?? 35.Qe3 Bh3 36.Bg2 Bg2 37.Kg2 Qd6 38.Re8 Kg7 39.Rd8 Qd8 40.Qe5 Kf7 41.d5 Qc8 42.Qf4 Ke7? 43.Kf3 Qc3?? 44.Qe3 Qe3 45.Ke3 Kf6 46.Ke4 (46...h6 47.g4+–) 1–0. Gibbons,R (2085) – Gloistein,Bruce, Auckland NZL, 2004.

5.e3 Nf6 6.Nf3 e6 7.Be2 =.

5.e3 Nf6 6.Nf3 Bg4 7.Be2 (7.h3 Bf3 8.Qf3 Nbd7=) 7...Nbd7 8.0–0 e6 9.c4 (9.Nc3 Bd6=) 9...Nc5 (9...dc4 10.Bc4 Bd6 11.h3=) 10.d4+= Nce4 11.Nc3 (11.c5 Be7+=) 11...Bb4= 12.Ne4 Ne4 13.Ne5 (13.bc6 bc6 14.cd5 cd5=) 13...Be2 14.Qe2 f6?? ( 14...cb5 15.c5 0–0 16.Qb5 Qc7=) 15.Qh5+– g6 16.Ng6! hg6 17.Qh8 Kd7 18.Qg7 Qe7 19.Qg6 Nd2 20.cd5 Nf1 (20...cd5 21.Rfd1+–) 21.bc6 (21.Kf1?! cd5 22.Rc1 Bd6+–; 21.Rf1?! cd5 22.e4 Rh8+–) 21...Kc7 (21...bc6 22.dc6 (22.Kf1?! cd5 23.Qd3 Kd8+–; 22.Rf1?! cd5 23.Rb1 Rb8+–) 22...Kd6 23.Rf1+–) 22.Rf1 ed5 23.cb7 Kb7 24.Rc1 Rh8 25.h3 Rh7 26.Qf5 Qd7 27.Qf6 Qa4 28.Qd8 Qb3 29.Ba1 a4 30.Qc8 Ka7 31.Qf5 Rb7 32.h4 a3 33.h5 a2 34.h6 Bd6 35.Qc8 Qb1= 36.h7?? Rc7–+ (37.Qc7 Bc7–+) 0–1. Wall,Bill – HawgDog, internet, 2003.

4.a4 e6

5.e3 Bd6?? 6.Bg7+– Be5 7.Be5 Nf6 (7...f6 8.Qh5 Kf8 9.Qh4+–) 8.Nf3 (better 8.Qf3 Qc8 9.Qf6+–) 8...Rg8 9.g3 Ng4 10.Bg2 f6 11.Bb2 e5 12.h3 Nh6 13.d4 e4 14.Nfd2 Be6 15.c3 Nd7 16.Ba3 f5 17.Nb3 Nf7 18.N1d2 Qf6 19.Qh5 0–0–0 (19...h6 20.Qe2+–) 20.Qe2 (20.Na5 h6+–) 20...Ng5 (20...b6 21.Rc1+–) 21.Nc5 (better 21.Na5 Nb6+–) 21...Nc5 22.Bc5 (22.dc5?! Qc3 23.Qd1 d4+–) 22...b6 (22...Bf7 23.Ba3+–) 23.Ba3 Rg6 24.Rc1 Rdg8 25.c4 Nf7 26.c5 Kb7 27.cb6 cb6 28.Nb3 Nd6 (28...Rc8+–) 29.Bd6 h5 (29...Rc8 30.Rc8 Bc8 31.Be5+–) 30.Be5 (30.Na5 ba5 31.Rc7 Kb8 32.Re7 Ka8 33.b6 Qe7 34.Qa6 Qa7 35.Qa7) 30...Qf7 31.Rc7 Qc7 32.Bc7 Kc7 33.Qc2 (33.Qc2 Kd8 34.Qc6+–) 1–0. alessandrocarvalhaes – stormycookie (1650), lichess.org, 2017.

5.e3 Nf6 6.Nf3 Bd6 7.d4 c6 8.Bd3 cb5 (8...0–0 9.0–0+=) 9.ab5+= Qb6 10.Na3 (10.Ba3 0–0+=) 10...Ba3 (better 10...0–0!?=) 11.Ba3+– Bb5? (better 11...Qc7+–) 12.Rb1+– 1–0. Anonymous – Anonymous, lichess.org, 2020.

4.e3 c6

5.a4 cb5 6.ab5 Qb6 7.Na3 Nf6 8.Bd4 Qc7 (8...Qd8+=) 9.c4 (9.b6 Qd6 10.Nf3 e6+–) 9...e6 (better 9...e5!? 10.Bb2 Bd6=+) 10.Bf6+= gf6 11.cd5 ed5 12.Rc1 Qb6 13.Qb3 (13.Nb1 d4+= (13...Bb5?? 14.Qb3+–)) 13...Be6 (13...a4 14.Qd3=) 14.d4 Nd7 15.Nf3 a4 16.Qb2 (16.Qa2 Rg8=) 16...Qa5 17.Nd2 (17.Kd1 Qb4 18.Qb4 Bb4=) 17...Nb6 (17...Qb4 18.Qb4 Bb4 19.Ra1=) 18.Be2 (18.Qa2 Bd6=) 18...Ba3 (better 18...Qb4!? 19.Qb4 Bb4=+) 19.Qa3+= Rc8 (19...Nc4 20.Bc4 dc4 21.e4+=) 20.Rc8+– Nc8 21.Qc1 Na7 (21...Rg8 22.0–0+=) 22.0–0 Nb5? (better 22...0–0+–) 23.e4?? (better 23.Qc5 Bd7 24.Rb1+–) 23...Nc3 (23...Nd4!? 24.Bd3 0–0–/+) 24.Bd3=+ f5 (24...Qb4 25.ed5 Qd4= (worse 25...Bd5 26.Nb1 Nb1 27.Qc8 Ke7 28.Qh8+–; 25...Nd5?! 26.Ne4=)) 25.ef5+= Bf5 26.Re1 (better 26.Qe1 Ne4 27.Be4 de4 28.Qe3+=) 26...Kf8?? (better 26...Be6=) 27.Bf5+– Qb4 (27...Qc7 28.Nb3! h6 29.Nc5+–) 28.Nf3 (better 28.Re3 Kg7 29.Rc3+–) 28...a3 (28...h6 29.Qf4 Ne4+–) 29.Qh6 Kg8 30.Re8 Qf8 31.Rf8 (31.Qf8) 1–0. GuestBTLS – GuestHKRQ, freechess.org, 2019.

5.a4 cb5 6.ab5 Qb6 7.Bd4 Qc7 (7...Qd6!?=) 8.Nf3 f6 9.Nc3 e6 10.e4 (10.b6 Qd8+=) 10...de4+= 11.Ne4 e5 12.Bc3 (12.Be3 Ne7=) 12...Bb4?? ( 12...a4=) 13.Bb4+– 1–0. Fredek (2090) – Guest1414904, Freundschaftspartie, 5m + 0s, 2006.

5.a4 c5 6.c4 e6 7.Nf3 Be7?? (better 7...Nf6+=) 8.Bg7+– Bf6 9.Bh8 Bh8 10.d4 cd4 11.ed4 Nf6 12.Ne5 b6 (12...Ne4 13.Qg4 Be5 14.Qg8 Ke7 15.Qd8 Kd8 16.de5+–) 13.Be2 (13.Qf3 Bc8+–) 13...Ne4 14.0–0 (worse 14.Nd7 Nd7 15.Ra3 Qf6+–) 14...Qg5 15.f4 (15.Nd7?! Nd7 16.Bf3 Rc8 17.cd5 ed5+–) 15...Qh4 (15...Qh6 16.Bd3+– (16.Nd7?! Nd7 17.Qd3 Qf6+–)) 16.Nd2 (16.Bh5 Be5 17.fe5 dc4 18.Bf7 Kd8+–) 16...Nc3 (16...Be5 17.de5 (17.fe5?! Nc3 18.Qe1 Qd4 19.Kh1 Qe5+–) 17...Nc3 18.Qe1 Qe1 19.Rfe1 (19.Rae1?! Na4 20.Bf3 Ra7+–) 19...Ne2 20.Re2+–) 17.Qe1 f5 (17...Qe1 18.Rfe1 Ra7+–) 18.Qh4 (18.Qh4 Ne2 19.Kh1 Be5 20.fe5+–) 1–0. GuestPLVP – GuestHFHT, freechess.org, 2017.

5.Nc3 Nf6 6.Nf3 cb5 7.Nb5 Nc6 +=.

5.Qf3 Nf6+= 6.bc6 (6.Nc3 e5 7.Qg3 Bd6=) 6...bc6 7.Be2 Na6 8.Bd4 Nb4 9.Na3 e6 10.c3.

4.e3 e6

5.a4 c6 6.Nf3 Nf6 7.Be2 Ne4 8.0–0+– cb5 9.ab5 b6 10.Ne5 (10.d3 Nf6 11.c4 Bb4+–) 10...f6 (10...Bd6 11.f3 Nf6 12.c4+–) 11.Nd7 Nd7 12.c4 Bc5 (12...dc4!? 13.Bc4 Qe7+–) 13.cd5 ed5 14.Qb3 (14.Bf3 f5+–) 14...Qe7 (14...Bb4 15.Qd5 Ndc5 16.Qa2+–) 15.Qd5 Rd8 16.d4 Bb4 17.Rc1 Qd6 1–0. DEFFM – GuestXPMP, freechess.org, 2019.

5.Nf3 Nf6 6.Be2 c5 7.c4 d4? (better 7...Bd6!?=) 8.ed4+– cd4 9.Nd4 (9.Bd4 Be7+–) 9...Bc5 10.Nf3 1–0. GuestKVMJ – STBVxx, freechess.org, 2017.

5.Nf3 Nf6 6.Be2 Bd6 7.0–0 0–0 8.a4 Be8 9.d4 c6 10.c4 (10.Ba3!?) 10...b6 11.Nbd2 Qc7 12.h3 Nbd7 13.Rc1 (13.bc6 Nb8 (13...Qc6 14.cd5 ed5 15.Rc1 Qb7 16.Bd3 Rc8 17.Rc8 Qc8+=) 14.cd5 ed5 15.Ba3 Ba3+=; 13.cd5 cd5 (13...ed5 14.bc6 Nb8 15.Ba3 Ba3 16.Ra3 Qc6 17.Ne5+=) 14.Rc1 Qd8 15.Rc6 Qe7 16.Rc1 Rd8+=) 13...c5 14.Nb3 (14.cd5 ed5 (14...Nd5 15.Ne4 Be7 16.dc5 Nc5 17.Qd4 Bf6 18.Nf6 Nf6+/–) 15.dc5 Bc5 16.Bd3 Rc8+/–; 14.dc5 bc5 (14...Bc5 15.Nb3 Rb8 16.Nc5 bc5 17.Qd3 dc4 18.Qc4 e5+=)) 14...Qb7 (14...Rd8 15.dc5 Bc5 16.Nc5 Nc5 17.Bf6 gf6 18.cd5 Rd5 19.Nd4+/–; 14...dc4 15.Rc4 (15.dc5 Nc5 16.Nc5 Bc5 17.Qc2 Rd8 18.Rfd1 Rd1 19.Rd1 Nd5+=) 15...Nd5 16.Qc2 Nb4 17.Qd2 Rc8+/–) 15.Qc2 Rc8 16.Nfd2 Bb8 (16...cd4 17.ed4 dc4 18.Bf3 Nd5 19.Nc4=; 16...dc4 17.Nc4 cd4 18.Nd4 e5 19.Nc6 Qc7 20.Rfd1+=) 17.Bf3 (17.dc5 bc5 (17...Nc5 18.Bf6 Qc7 19.Nf3 gf6+=) A) 18.Nf3 Qa8 (18...Qb6 19.Bc3 Ne4 20.Ba5 Qd6 21.cd5 ed5 22.Rfd1+–) 19.cd5 ed5 20.Bc3 Ne4+/–; B) 18.cd5 Nd5 (18...Qc7 19.d6 Qd6 20.Nf3 e5+/–); 17.cd5 Nd5 (17...Qc7 18.Nf3 Nd5 19.dc5 Nc5 20.Nc5 bc5 21.Rfd1 Ba7+/–) 18.Rfd1 f5 19.Bf3 Bd6 20.dc5 Nc5 21.Nc5 Bc5+/–) 17...Qc7 18.g3 Kh8 (18...cd4 19.Nd4 (19.ed4 dc4 20.Nc4 Kh8 21.Rfe1 Nd5+=) 19...Nc5 20.cd5 Nd5 21.Bd5+=; 18...dc4 19.Nc4 (19.Qc4 Qd8 20.Rfd1 Bd6 21.Qe2 Qe7 22.dc5 Nc5 23.Nc5 Bc5+/–) 19...cd4 20.Nd4 Nc5 21.Rfd1 Bd7 22.Nc6 Bc6 23.bc6+=) 19.Rfd1 Rg8 20.e4 (20.dc5 Nc5 (20...bc5 21.Bf6 Nf6 22.cd5 Nd5 23.Bd5 ed5 24.Qc5 Qc5 25.Rc5+–) 21.Nc5 Qc5 22.Qb3 Qe7+/–; 20.cd5 Nd5 (20...ed5 21.dc5 bc5 22.Bf6 Nf6 23.Qc5 Qc5 24.Nc5 Bd6 25.Ndb3+–) 21.Bd5 ed5 22.Qf5 Qb7 23.dc5 Nc5 24.Nf3+–) 20...de4 21.Ne4 Ne4 22.Be4 f5 23.Bg2 f4 24.gf4?! Qf4 25.dc5 Nc5 26.Rd4?! Qh2?! 27.Kf1 Bg6? 28.Qg6!! Nb3? 29.Rh4 Nd2 30.Ke2 1–0. Schirmer – Richter, corr 1995 (Schirmer).

3.Bb2 Nd7

4.e3 Nc5 5.Bd4 (5.Nf3 Nf6=) 5...b6 (5...Ne6 6.Be5=) 6.c4 (6.Nf3 Nf6+=) 6...Ne6 (6...e6 7.Nf3=) 7.Nf3 (7.Bb2+=) 7...a4 (better 7...Nd4!? 8.Nd4 Bb7=) 8.Be5+– f6 (8...Nf6 9.Nc3+–) 9.cd5 fe5 (9...Qd5!? 10.Nc3 Qd7+–) 10.de6+– Be6 11.Ne5 Nf6 12.Nc3 Nd5 (better 12...Bd5+–) 13.Qh5 (worse 13.Na4 g6+–) 13...g6 14.Ng6! Rg8 (14...hg6 15.Qh8 Pinning (15.Qh8 Deflection)) 15.Ne5 Bf7 (15...Rg6 16.Bc4 Qd6 17.Ng6 Nf6+–) 16.Qf7 1–0. Pierre – Valdy, internet, 2020.

4.e3 e5 5.Nf3 Bd6 6.Be2 Ngf6 7.c4 e4 8.Nd4 dc4 9.Bc4 Ne5 10.Qc2 0–0 11.a4 (11.Be2 Rb8=+) 11...Nfg4 12.h3 (better 12.Be2 Qf6 13.f4 ef3 14.Nf3–/+) 12...Nf2?? (better 12...Nc4 13.hg4 Nb2 14.Qe4 h6–/+) 13.Kf2+= Qh4 14.Kg1?? (better 14.Kf1 Ng4 15.Ke2 Qf2 16.Kd1 Qg2 17.Rf1=) 14...Qe1 15.Bf1 Nd3 (15...Nd3 16.Qd3 ed3–+; 15...Ng4 16.hg4 Bg3 17.Rh7 Qf2 18.Kh1 Qf1) 0–1. GuestMXLJ – GuestLTPX, freechess.org, 2017.

4.e3 Ngf6 5.Nf3 e6 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3 Nbd7).

4.Nf3 a4 5.c4 dc4 (5...e6 6.Nc3 a3 7.Bc1=) 6.e3 Nc5 (6...Ngf6 7.Na3+=) 7.Bc4 Be6 (7...Nd3!? 8.Bd3 Qd3+=) 8.Be6+/– Nd3 9.Ke2 Nb2 10.Qc2 a3 11.Na3 Ra3 12.Bb3 e6 13.Qb2 Nf6 14.Qd4 Qd4 15.Nd4 Kd7 16.Nc2 Ra5 17.a4 Be7 (17...h5 18.Nd4+/–) 18.Na3 Ba3 19.Ra3 Rc8 20.Rb1 Rca8 (20...c6 21.Bc2+/–) 21.Bd1 Kd6 22.g3 h5 23.Kf3 (23.Rd3 Kc5 24.Rc1 Kb6 25.Bb3+/–) 23...h4 (23...Kc5!?+/–) 24.Rd3 Ke7 (24...Kc5 25.Rc1 Kb6 26.gh4+–) 25.gh4 Rc8 26.e4 Ra7 27.Rc3 b6 28.Rbc1 Kd7 29.Rd3 Ke7 30.e5 Nd5 31.Kg3 c5 (31...f6 32.ef6 Kf6 33.Bb3+–) 32.bc6 Rac7 33.Bf3 Rc6 34.Rc6 Rc6 35.Bd5 ed5 36.Rd5 Rc4 37.Rd6 Ra4 38.Rb6 Rd4 (38...g6+–) 39.Rd6! Re4 (39...Rd6 40.ed6 Passed pawn) 40.d4 g6 (40...Re2 41.h5 Rd2 42.h4+–) 41.f4 Re3 (41...Re1 42.f5!+–) 42.Kg4 Re2 43.Kg5 Rg2 (43...Rh2 44.Rf6+–) 44.Kh6 Kf8 45.Rd8 Ke7 46.Rb8 Rg4 (46...Rf2 47.d5 Rf4 48.d6 Kd7 49.Rb7 Ke8 50.Kg7+–) 47.h5 gh5 (47...Rf4 48.hg6 fg6 49.d5+–) 48.f5 Rd4 (48...Rg2+–) 49.Rb7 Ke8 50.Kg7 Rd2 (50...Re4 51.Kf6 Re2 52.Re7 Kd8 53.Kf7+–) 51.Rf7 Rh2 52.Ra7 Re2 53.e6 Kd8 54.Kf8 Kc8 55.e7 1–0. forsetinn (2365) – manijer_wmp3 (2160), gameknot.com, 2015.

4.Nf3 f6 5.d4+= c5 6.e3 c4 7.e4 e6 8.Nc3 Bb4 9.a3 Bc3 10.Bc3 Nb6 11.e5 f5 (11...fe5!? 12.de5 Ne7+=) 12.a4 Nd7 13.h4 (13.Bd2 Qb6+–) 13...h5 (better 13...Ne7!?+=) 14.Ng5 Nf8 15.Be2 g6 16.Bd2 b6 17.Nh3 Qe7 18.Nf4 (18.0–0 Nh7 19.Nf4 Nf8+–) 18...Bd7 19.Bc1 0–0–0 20.Ba3 Qf7 21.Qd2 Kb8 22.Rh3 Ne7 23.Rg3 Be8 (23...Kb7 24.0–0–0+–) 24.Qc3 Rh7 25.Bd6 Ka7 26.Kd2 (26.0–0–0 Rg7+–) 26...Rg7 27.Rg1 Nh7 28.Bh5?? (better 28.Kd1+–) 28...gh5–/+ 29.Rg7 Qg7 30.Qe3 Qg8?? (better 30...Qf7–/+) 31.Be7+– (31.Be7 Rc8 32.Qa3 c3 33.Kc1+–) 1–0. Wolf,M – Skorna,Ullrich, DDR–Cup5 corr7980, 1979.

4.a4 c5

5.c4 d4 6.e3 e5 7.ed4 ed4 8.Nf3 Ngf6 9.d3 Bd6 10.h3 (10.Be2 0–0=+) 10...0–0 11.Be2 b6 12.0–0 Bb7 13.Nbd2 Re8 14.Re1 Qc7 15.Bf1 Rad8 16.Qc2 Nf8 (16...Ne5 17.Ne5 Be5 18.Re2–/+) 17.Ne4 (17.g3 Ng6 18.Bg2 Ne5=+) 17...Ne4–/+ 18.de4 Ng6 19.Qd3 (19.Bc1 Bf4–/+) 19...Ne5 (19...Nf4!? 20.Qb1 f5–+) 20.Ne5=+ Be5 21.g3 Re6 (21...h5 22.f4 Bd6 23.Bg2=+) 22.Bg2 g6 23.f4 Bh8 24.e5 (24.Rad1!?=) 24...Bg2–/+ 25.Kg2 Rde8 26.Qe4 (26.Re4 f6–/+) 26...f6 27.Qd5 Kf8 (27...fe5!? 28.fe5 Be5 29.Rad1–+) 28.Rf1–/+ Bg7 29.Rf2 Kg8 (29...fe5 30.f5 gf5 31.Rf5 Kg8 32.Qe4–/+) 30.Raf1? (30.f5 gf5 31.ef6 Bf6=+) 30...Kh8 (30...fe5 31.g4 Kh8 32.fe5 Re5 33.Qc6 Qc6 34.bc6–+) 31.Bc1 (31.ef6!? Rf6 32.Bc1–/+) 31...fe5–+ 32.fe5 Be5?? (better 32...Qe5!? 33.Qe5 Re5–+) 33.Rf7?? (33.Bh6 Bf6 34.Rf6 Rf6 35.Rf6 Qe7+–) 33...Qd6?? (33...Qc8 34.Bh6 Bd6 35.R1f2=+) 34.Qd6?? (better 34.Bh6 Bf6 35.Qd6 Rd6 36.R1f6 (worse 36.R7f6 Rf6 37.Rf6 Kg8+–) 36...Rf6 37.Rf6+–) 34...Bd6–/+ 35.h4 Re2 36.Kh3 Rc2 (36...Be7 37.Bh6–/+) 37.Bh6 (37.R7f6 Be5 38.Rb6 Rc3=) 37...Rc3–+ (37...Rc4 38.R1f6 Ra4 39.Rd6+–) 38.Bf4 Bf4 39.R1f4 Ree3 (39...Rc4?! 40.Rb7=) 40.Kg4?? (better 40.Rb7 Kg8 41.Rb6 Rg3 42.Kh2–+) 40...Rg3 0–1. GuestNGZX – MaverickDark, freechess.org, 2017.

5.c4 d4 6.e3 e5 7.Qe2 Ne7=.

5.c4 d4 6.e3 e5 7.Nf3 Ngf6 (7...e4 8.Ng1 d3 9.Na3=+) 8.ed4=+ ed4 9.d3 Bd6 10.Be2 0–0 11.h3 (11.0–0 Re8=+) 11...Qc7 12.0–0 Re8 13.Re1 b6 14.Nbd2 Bb7 15.Bf1 Rad8 (15...Re1 16.Qe1 Re8 17.Qd1–/+) 16.Qc2 Bf4 17.Re8 Re8 18.Re1 Re1 19.Ne1 Nf8 (19...Qe5 20.Ndf3 Qh5 21.Bc1 Bc1 22.Qc1=+) 20.Qd1 Ng6 21.Ndf3 Qe7 22.Qe2 Qd7 23.g3 Bb8 24.Bc1 h5 (24...Bd6 25.Bg2=+) 25.Bg2 h4 26.Ng5 (better 26.Nh4 Nh4 27.gh4 Bg2 28.Kg2=) 26...hg3–/+ 27.fg3 Bg3 28.Bb7 Qb7 29.Ne4? (better 29.Bd2!?–/+) 29...Ne4–+ 30.Qe4?? (30.de4 Qd7 31.Kg2–+) 30...Qe4 31.de4 Be1 0–1. GuestHYTV – MaverickDark, freechess.org, 2017.

4.a4 e5

5.e3 Bc5 6.Nf3 Qf6 (6...Bd6 7.Be2=) 7.Nc3 (7.c4 d4=) 7...c6 (7...Ne7 8.Be2=) 8.Be2 Ne7 9.0–0 0–0 10.d4 ed4 11.Nd4 Bd4 (11...Re8 12.Qd2=) 12.ed4 (12.Qd4 Qd4 13.ed4 Nf6+=) 12...Ng6 (12...Re8 13.Re1=) 13.Bf3 (13.Re1 Rd8+=) 13...Nb6= 14.Ne2? (14.bc6 Qc6 15.Qd3 Be6=+) 14...Bf5 (better 14...Nh4 15.Nc3 Bh3–+) 15.Ng3= Bd7 16.Be2 (16.Nh5 Qd8=) 16...Nf4 17.Bf3 (17.Bg4 Bg4 18.Qg4 cb5 19.ab5 Rfc8=+) 17...Rac8 (17...cb5 18.ab5 Rfe8 19.Bc1–/+) 18.Re1=+ Nc4 19.Bc1 Ne6 20.Be2 (20.Be3=+) 20...Nd4 (better 20...cb5!? 21.Bc4 Rc4 (21...dc4?! 22.ab5 Qd4 23.Ra5=+) 22.ab5 Ra8–/+) 21.Bc4= dc4 (better 21...Nc2 22.Qc2 Qa1=+) 22.Kh1?? (better 22.Bb2!? c3 23.Bc3+=) 22...c5?? (better 22...Nc2 23.Qc2 Qa1–+) 23.Ne4 Qb6 (23...Qg6 24.Ra3 Bg4 25.f3–/+) 24.Bf4 (24.Nc5 A) 24...Rc5? 25.Qd4 Qf6 26.Qf6 (26.Qc5?! Qa1 27.Qc4 Be6+–) 26...gf6 27.Ba3+–; B) 24...Qc5 25.Ba3 Qb6–/+) 24...Ne6 (better 24...Rce8!? 25.Qd2 Re6=+) 25.Bd6 Rfe8 26.Nc5?? (better 26.Qd5+=) 26...Nc5–+ (26...Rc5?! 27.Bc5 Nc5 28.Re8 Be8 29.Qd5–/+) 27.Bc5 (27.Re8 Be8 28.Qg4–+) 27...Qc7 (better 27...Re1 28.Qe1 Qc5–+) 28.Re8 Re8 29.Be3 Be6 30.Qd4 Rd8 31.Qf4 (31.Qa7 Qd6 32.h3 Qd5=) 31...Qf4=+ 32.Bf4 Rd4 (32...Bf5 33.c3=+) 33.g3 (33.Be3 Rd6=) 33...f6 34.Re1 (34.Be3 Rd6=+) 34...Bd5–/+ 35.Kg1 Kf7 (35...c3 36.Ra1 Rc4 37.Kf1–/+) 36.h4 (36.Be3 Re4=) 36...h6 (36...c3 37.Ra1 Be4 38.Bc7 Bc2 39.Ba5–/+) 37.b6? (better 37.Be3 Rg4 38.Bb6=) 37...c3–+ 38.Bc7 (38.Ra1–+) 38...Ra4 39.Re3?? (39.Rc1 Be4–+) 39...Rc4 (39...Ra1 40.Re1 Re1 41.Kh2 Rh1) 40.Rd3 (40.f3 Be6–+) 40...Bc6 (40...Be4 41.Rd7 Kg6 42.Bf4–+) 41.Bf4 (41.f3 Ba4 42.Bf4 g5–+) 41...a4 42.Rd6 (42.Bd6 Be4 43.Re3 Bc2 44.Re7 Kg6 45.Rc7–+) 42...a3 43.Rc6 (43.Rd1 a2 44.Bd6–+) 43...Rc6 44.Bc1 Rb6 (better 44...a2 45.Kg2 Rb6–+) 45.Ba3 Ra6 (better 45...Rb2 46.Kf1–+) 46.Bb4 Ra2 47.Bc3 Rc2 48.Bd4 Rc4 (48...b5 49.Kf1–+) 49.Be3 (49.Bb6–+) 49…b5 (49...b5 50.Bd2 b4 51.Bb4 Rb4–+) 0–1. AhmedSultanov (1705) – skfarhad, lichess.org, 2019.

5.e3 f6 6.Nf3 Bd6 7.c4 Ne7 8.cd5 Nd5 9.Nc3 Nb4 (9...N7b6 10.Nd5 Nd5 11.Qb3=) 10.Bc4 (10.d4 ed4 11.Nd4 Be5+=) 10...Nc5 11.0–0 Ncd3 12.Ba3 Nb2?? (12...f5 13.e4=) 13.Qb3 (better 13.Bb2 Qe7 14.d4+–) 13...Nc4= 14.Qc4 Nc2 (14...Qe7!?=) 15.Bd6+= Na1 16.Bc7 (worse 16.Qc7 Qc7 17.Bc7 Nb3=) 16...Qe7 17.Ra1 (17.Ne4!? Be6 18.Qc3+–) 17...Be6= 18.Nd5 Bd5 19.Qd5 Qc7 20.d4 Rd8 21.Qe6 Qe7 22.Qb6 e4 (22...Ra8 23.Rd1=) 23.Nd2+= Qb4? (better 23...0–0+=) 24.Ne4+– 0–0 25.Qb7 Rfe8 26.Nc5 (26.Qc6 f5 27.Nc5 Qd2+–) 26...Qc3? (better 26...Rd4!? 27.Ne6 Rg4+–) 27.Rf1+– Re3? (27...Qb4+–) 28.fe3 Qe3 29.Kh1 Qd4 (29...Rd4 30.Qb8 Kf7 31.Qa7 Qe7 32.Qe7 Ke7+–) 30.Ne6 Qf2 (30...Qg4 31.Nd8 h6 32.Qf7 Kh7+–) 31.Qg7 (31.Rf2?? Rd1 32.Rf1 Rf1) 1–0. RichardSommer (2000) – Daktarin (2005), lichess.org, 2020.

5.e3 Ngf6 6.Nf3 Bd6 7.c4 (7.Be2 0–0=+) 7...0–0 8.Nc3 (8.cd5 Nd5 9.e4 N5f6=+) 8...d4 (8...e4!? 9.Nd4 dc4 10.Bc4 Ne5–/+) 9.ed4= ed4 10.Nd4 Re8 11.Be2 Nc5 12.0–0 (12.Qc2 Bf4 13.Nd5 Nd5 14.cd5 Qd5=+) 12...Bh2 13.Kh2 Qd4 14.g3 (14.Qc2 Qf4 15.g3 Bf5–/+) 14...Qd7 (14...Bf5 15.Kg2–+) 15.Rh1 (15.Re1–/+) 15...b6 (15...Nd3!? 16.Bd3 Qd3–/+) 16.Bf3 (16.d4 Nce4 17.Kg2 Bb7=) 16...Rb8 (16...Bb7!? 17.Bb7 Nb7=+) 17.d4= Nce4 18.Ne4 Ne4 19.Be4 (19.Kg1 Qd6=) 19...Re4 20.Kg2 (20.Qd3 Bb7 21.f3 Re6=+) 20...Bb7=+ 21.Kg1 (21.f3 Re3 22.d5 Rbe8=+) 21...Rbe8–/+ 22.Bc3 Re2 23.Rh2 (23.d5 Qf5 24.Bd4 Qf3–/+) 23...Qg4 24.Qd3 Be4 25.Qd1 Qf3 26.Rc1 ( 26.Bd2–/+) 26...Re6 27.Qf1 Rg6 ( 27...Rh6 28.Qg2 Qf5 29.Qe4 Qe4 30.Rh6 gh6–+) 28.Qh3 (28.Be1 h6–/+) 28...h6–+ 29.c5?? (29.Be1 Qa3 30.Qc8 Kh7–+) 29...Kh7 ( 29...Rf2! 30.Rf2 Rg3 31.Kf1 Bd3 (31...Rh3?! 32.Rf3 Rf3 33.Ke2–+) 32.Ke1 Qe3 (32...Rh3?! 33.Rf3 Rf3 34.d5–+) 33.Kd1 Rh3 34.c6 Rh1 35.Rf1 Qe2) 30.Qg2 ( 30.Be1!?–/+) 30...Qd3–+ 31.Qh3 Rf2 32.Rf2?? (32.Kf2 Qf3; 32.Rf2 Qg3 (32...Rg3)) 32...Rg3–+ 33.Qg3 Qg3 34.Kf1 Bd3 35.Ke1 Qe3 36.Kd1 Qf2 (37.Rc2 Qc2 38.Ke1 Qe2#) 0–1. Fredek (2090) – Guest1150328, Freundschaftspartie, 5m + 0s, 2005.

4.Nf3 Ngf6

5.e3 a4 6.c4 e6 7.cd5 Nd5 (7...ed5 8.Bd4=) 8.Na3 Bc5 (8...N7f6 9.Nc4+=) 9.Bg7+= Rg8 10.Bb2 e5 11.Rc1 e4 12.Nd4 Rg5 (12...Qe7 13.Nf5 Qf8+/–) 13.h4+/– Rg6 14.Nc4 a3 15.Ba1 Nb4 (15...Bb4 16.Rb1+/–) 16.Qb3 Bf8 17.Qb1 (17.Na3? Ra3 18.Qa3 Nd3 19.Qd3 ed3–+) 17...Qe7 1–0. housemd (1960) – manijer_wmp3 (2160), gameknot.com, 2015.

5.e3 b6 6.c4 e6 7.cd5 Nd5 8.Be2 N7f6 9.0–0 Be7 10.Nc3 0–0 11.Qc2 h6 12.Nd5 Nd5 13.a3 Bf6 14.Bf6 Nf6 15.Rac1 Ra7 16.Ne5 Bd7 17.d4 Nd5 18.a4 Nb4 19.Qe4 f5 (19...Bc8 20.Qg4+=) 20.Qf4 Be8 21.Qg3 Qf6 22.Rc4 Nd5 23.Bf3 f4 24.ef4 Nb4 (24...Nf4!? 25.Rfc1 Qd8+/–) 25.Rfc1+– Nd5 (25...Qe7 26.Qg4+–) 26.Bd5 ed5 27.Rc7 Rc7 28.Rc7 Qf4?? (28...Bh5+–) 29.Qg7# 1–0. Fournier,Frederic (2445) – Boluc (1865), Chessworld.net, 2012.

5.e3 Nb6 6.a4 g6 7.d3 Bg7 8.Be2 0–0 9.0–0 c5 10.Nbd2 Re8 11.c4 dc4 12.dc4 Bf5 13.Qb3 Nbd7 (13...e5 14.Rad1 (14.Be5? Re5 15.Ne5 Qd2–+) 14...Qc7 15.Nh4=) 14.Rad1 (14.h3 e5+=) 14...Qc7 (14...e5!?=) 15.h3+= Rad8 16.Nb1 (16.Nh4!?+=) 16...Bb1= 17.Rb1 Ne4 18.Bg7 Kg7 19.Qb2 Kg8 (19...e5 20.Rfd1=) 20.Rbd1 Qb6 21.Qc2 Qe6 (21...Ndf6 22.Ne5=) 22.Rd3 (22.Rd5 Nef6 23.Ng5 Qb6+=) 22...Nb6 23.Rdd1 Nd6 Pawn c4, live or die! 24.Rc1 Rd7 25.Rfd1 Red8 26.Nd2 Na8 (26...Ndc4 27.Nc4 Rd1 28.Rd1 Rd1 29.Qd1 Nc4 30.Qd8 Kg7 31.Qc7=) 27.Nb3 (27.Bg4 f5 28.Bf3 Qe5+=) 27...b6= 28.Bf3 Ne8 29.Rd7 Qd7 30.Rd1 Qc7 31.Bc6 Nf6 32.Rd3 Qb8 33.Qd1 Rd3 34.Qd3 Nc7 35.Nd2 Nce8 36.e4 Nc7 37.Nf3 Ne6 38.g3 Nh5 39.e5 Nhg7 40.Qd5 (40.Be4 Qf8+=) 40...Nf5= 41.Bd7 Nfd4 42.Nd4 Nd4 43.Qe4? (43.Kg2 e6 44.Qe4 Qd8=) 43...Qc7?? (better 43...Qe5! 44.Qb7 Nb3 45.Qb6 Nd2–+) 44.Bc6= Qd8 45.Kg2 e6 46.h4 Nf5 47.Qe2 Qd4 48.Bf3 Qc3 49.Bc6? (49.Qe4 Nd4 50.Qa8 Kg7=) 49...Nd4 (49...h5–/+) 50.Qa2? (better 50.Qg4=+) 50...Qe1 51.f4? (better 51.Bf3–+) 51...Ne2 52.Qb3 Qg1 53.Kh3 Nd4 54.Qd3 h5 55.Bf3 Qf2 56.Bg2 Qa2 57.Qe4 (57.Qd1 Qc4 58.Bc6 Qc3–+) 57...Qc4 58.Qa8 (58.f5 ef5 59.Qf4 Qb3–+) 58...Kg7 59.Qd8 Nf5 60.Qf6 (60.Qb6 Qd3 61.Kh2 Qg3 62.Kg1 Ne3 63.Qb7 Qe1 64.Kh2 Ng4 65.Kh3 Qg1 66.Kg3 Qf2 67.Kh3 Qf4 68.Qf7 Kf7 69.b6 Nf2) 60...Kg8 61.Qd8 Kh7 62.Qf8 (62.Qb6?? Qb3 63.Kh2 Qg3 64.Kh1 Ne3–+) 62...Qd3 (better 62...Nh6 63.Qd6 Qb3–+) 63.Qf7= Ng7 64.Qf8?? (better 64.Qc7 c4 65.Qb6=) 64...Qf5–+ 65.Qf5 Nf5 (worse 65...gf5 66.Bf3+=) 66.Bf1 (66.Be4 Ne3 67.g4 hg4 (67...Ng4?! 68.Kg3–+) 68.Kg3 Kh6–+) 66…Ne3 0–1. Steiner,Peter Markus – Cleve_Prinz,Wolfgang (1955), 17th RLP–Senioren–Open, 2019.

5.e3 e6 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3 Nbd7).

5.e3 e6 6.c4 c5 7.Be2 Bd6 8.0–0 0–0 9.d4 b6 10.Nbd2 Bb7 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c5 5.Nf3 Bd6 6.c4 Nbd7 7.Be2 0–0 8.0–0 b6 9.d4 Bb7 10.Nbd2 a5).

5.e3 g6 6.c4 e6 (6...Bg7 7.d4=) 7.Nc3 Bg7 8.Ba3 (8.d4 0–0=) 8...b6 (8...Ne4!? 9.Qc2 Nc3 10.dc3 Ne5 11.Ne5 Be5+=) 9.d4 Bf8 10.Bf8 Kf8 11.Rc1 Bb7 12.Bd3 (12.cd5 Nd5 13.Nd5 Bd5+=) 12...Kg7 (12...dc4 13.Bc4 Kg7 14.0–0+=) 13.0–0 (13.cd5 ed5 14.Ne2 Rc8+=) 13...Qe7 (13...dc4 14.Bc4 Qe7 15.h3+=) 14.cd5 ed5 15.Ne2 Qd6 16.Nf4 Rac8 17.Qe2 Rhe8 18.Rc2 c6 19.bc6 Bc6 20.h4 (20.Rfc1+–) 20...b5 (20...Ba4 21.Rc8 Rc8 22.Qb2+=) 21.Rfc1 (21.h5 b4+– (21...Nh5? 22.Nh5 gh5 23.Nh4+–)) 21...b4 22.Ba6 (22.Ng5 Bb7+–) 22...Rc7+= 23.Nd3 (better 23.Nd2!?+=) 23...Ne4=+ 24.Nde5 (24.Qe1!?=+) 24...Nc3–/+ (worse 24...Ne5 25.de5 (worse 25.Ne5 Nc3 26.Rc3 bc3 27.Nc6 Rc6–/+) 25...Qd7 26.Qd3+–) 25.Qf1 (25.Rc3 bc3 26.Rc3 Rb8–/+) 25...Ba4 (25...Ne5?! 26.de5 Qc5 27.a3–/+) 26.Rb2 Ra8 27.Bd3 Nb6 (27...Rac8 28.Kh1–/+) 28.Nd2 (28.h5!?–/+) 28...f6–+ 29.Nef3 Rac8 30.Re1 (30.Kh1 Nc4 31.Bc4 dc4–+) 30...Nc4 31.Bc4 dc4 32.e4 Nd1 (32...Qb6 33.Rc1 Nd1 34.Rbb1–+ (34.Rd1?? Bd1 35.Qd1 c3–+)) 33.Rb1 (33.e5 Qb6 34.ef6 Kf8–+) 33...c3–+ 34.Nb3 (34.e5 fe5 35.de5 Qb6 36.Rbd1 Bb5–+) 34...Bb3 (34...c2 35.Rbd1 cd1R 36.Rd1–+) 35.ab3 c2 36.Rc1? (better 36.Rbd1 cd1Q 37.Rd1–+) 36...Qf4 37.Rcd1 cd1Q 38.Rd1 Rc1 (38...Qe4 39.d5 Qc2 40.Re1 Qb3 41.d6–+) 39.Nd2 Rd1 40.Qd1 Qc7 (better 40...Qh4 41.g3 Qg5–+) 41.Qe2? (better 41.Nf1–+) 41...Qc1 42.Nf1 a4! 43.e5 (43.ba4 Qa1 Double attack (43...Qa1 Decoy; 43...b3 Passed pawn)) 43...ab3 44.ef6 Kf6 45.Qe5 Kf7 46.Qd5 Ke7 (better 46...Kg7!? 47.Qb3 Qe1 48.Qg3–+) 47.Qb3 (47.Qe5 Kf8 48.Qh8 Kf7 49.Qh7 Kf6–+) 47...Qe1 48.Kh2 (48.h5 Rc1 49.Kh2 Qf1 50.Qb4 Ke6 51.Qb6 Kd5 52.hg6 hg6 53.Qg6 Qc4–+) 48...Qf1 49.Qb4 Ke8 50.Qa4 (50.Qb7 Qc4 51.Qh7 Qc7 52.Qc7 Rc7–+) 50...Kf8 51.Qb4 (51.Qd7 Qc4 52.Qh7 Qd4 53.Qh6 Kf7–+) 51...Kg8 52.Qd6 Qc4 53.d5 (53.f4–+) 53…Qc7 (53...Qc7 54.Qg3 Qg3 55.Kg3 Kf7–+; 53...Qh4 54.Kg1 Rc1) 0–1. Mousse Neto,Sebastiao Alberto (2035) – Fernandes Filho (2115), Manaus Brazil, Reigao Semifinal, 2015.

3.Bb2 e6

4.a4 b6 5.e3 Nf6 6.Nf3 Bd6 7.c4 Bb7 (7...0–0 8.Nc3=) 8.d4 0–0 9.Nbd2 Bb4 10.Qc2 dc4 11.Bc4 Bf3 12.gf3 Nbd7 13.Bd3 h6 (13...Rc8 14.Rg1=) 14.Ke2 Bd2 15.Qd2 Nd5 16.Rhg1 Qh4 17.Rg2 f5 18.Rag1 Rf7 19.Qc1 Rd8 20.Ba3 Nf8 21.Bc4 (21.Qc6 f4 22.Be4 Nf6+–) 21...Nb4 (21...f4 22.e4 Nb4 23.Bb2+–) 22.Bb4+– ab4 23.Qb2 Qe7 24.Rb1 f4 25.Qb4 Qf6 26.Rf1 fe3 (26...Qf5 27.Qb1 Qh3 28.Rfg1+–) 27.fe3+– Qf5 28.Bd3 Qh3 29.Rgf2 Rd5 (29...Rfd7 30.f4+–) 30.Rg1 Nh7 (30...Qh5 31.Qc3+–) 31.Rg3 Qh4 32.Bh7 (32.Rfg2 Rd6+–) 32...Kh7 33.Qb1 Kh8 34.Rg6 Qh3 (34...Qe7 35.Rfg2+–) 35.Qe4 Rd6 36.Rfg2 Qh5 37.R6g3 Rfd7 38.Qf4 Kg8? (better 38...Qf5 39.Qf5 ef5+–) 39.Qe4?? (better 39.Qf6! Qf7 40.Rg7 Qg7 41.Rg7 Rg7 42.Qh6+–) 39...e5 (better 39...Kh8!?=) 40.Qa8+– (40.Qe5 Qe5 41.Rg7 Rg7 42.Rg7 Qg7–+) 40...Kh7 41.Qf8 g6 42.Qe8 ed4 43.Rg6! Qd5 (43...Rg6 44.Qd7 Double attack (44.Qd7 Deflection; 44.Qd7 Overloading); 43...Qg6 44.Rg6 Combination) 44.Rd6 Qc4 45.Ke1 Qc1 46.Kf2 Qd2?? (better 46...de3 47.Qe3 Qe3 48.Ke3 Rd6+–) 47.Kg3 Rg7 48.Kf4 (48.Kh4 cd6 49.Rd2 d5+–) 48...Qg2 49.Qe4 Kh8 (49...Rg6 50.Rd7 Kh8 51.Qd4 Rg7 52.Rg7 Qg7 53.Kf5 Qd4 54.ed4+–) 50.Rd8 (50.Rh6 Rh7 51.Qh7) 50...Rg8+– 51.Qd4 Kh7 52.Rd7 (better 52.Qe4 Kh8 53.Qe5 Qg7 54.Qg7 Kg7 55.Rg8 Kg8+–) 52...Rg7?? (52...Kg6 53.Qe4 Kh5 54.Rd5 Rg5+–) 53.Rg7 Qg7 54.Qg7 Kg7 1–0. Iosif,Daniela – Niephaus,Friedel, Bruchkoebel, 1993.

4.a4 c5 5.Nf3 Nd7 6.e3 Ngf6 7.c4 Nb6 8.Qc2 Nc4 9.Bc4 dc4 10.Qc4 b6 11.e4 Bb7 12.Nc3 Ng4 13.h3 Nf6 14.0–0 Be7 15.Rad1 0–0 16.d4 Qc7 17.Rde1 Rfd8 18.Ba3 Rac8 19.dc5 Bc5 20.Bc5 Qc5 21.Qc5 Rc5 22.Re3 Rdc8 23.Rd1 Kf8 24.Rdd3 Nh5 25.Rd7 Ba8 26.Ra7! Nf4 27.Ne2 Ne2 28.Re2 f6 29.Nd4 Re5 30.f4 Re4 31.Ra8 Ra8 32.Re4 Re8 33.Re6 Re6 34.Ne6 Kf7 35.Nc7 Ke7 36.Nd5 Kd6 37.Nb6 1–0. mtr – test01, Internet, 2001.

4.a4 f5 5.e3 Nf6 6.c4 Bd6 7.Nc3 0–0 8.f4 c6 9.Nf3 Nbd7 10.Qc2 Qe7 11.h3 Ne4 12.Ne4 fe4 13.Ne5 Qh4 14.Kd1 c5 15.cd5 ed5 16.d4 c4 17.Qe2 Nf6 18.Kc2 Nh5 19.Rh2 Be7 20.g4 Ng3 21.Qg2 g5 22.f5 Bf5 23.gf5 Nf5 24.Kd2 Rac8 25.Bc3 Nd6 26.Be2 Nf7 27.Bg4 Ne5 28.de5 Ra8 29.Be6 Kg7 30.Rg1 h6 31.Bd5 Bc5 32.e6 Kh7 33.Be4 Kg8 34.Bd5 Rad8 35.e7 1–0. jura1946 – drucik89, kurnik, 2012.

4.a4 Nf6 5.e3 =+.

4.Nf3 Nf6 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5).

4.f4 Qh4 5.g3 Qh5 (5...Qd8 6.Nf3=) 6.Nf3 (6.Bg2 a4=) 6...Nd7 7.e3 Ngf6 8.Be2 Be7 9.Bd4 Qh6 10.c4 (10.Nc3 0–0=) 10...dc4 (10...c5 11.bc6 bc6 12.cd5 ed5 13.Qa4=) 11.0–0 (11.Bc4 0–0=) 11...0–0 12.Bc4 b6 (12...c5 13.bc6 bc6 14.Nc3=) 13.d3 (13.f5 Nc5=) 13...Bb7 14.Qe2 Rfd8 (14...Rad8 15.Ne5=) 15.Nc3 (15.Ne5 Ne5 16.fe5 Nd7=) 15...Ne8 16.f5 Nd6 17.fe6 fe6 18.Nd2 (18.Bb3 c5 19.bc6 Bc6+=) 18...c5 (18...Rac8 19.Rab1=) 19.bc6 Bc6 20.a4 (20.Rab1 Rab8 21.Bb3 Nc5=) 20...Rf8 21.Nb5 Bb5 22.ab5 Kh8 23.Rae1 a4 24.Qg4 Attacking the isolated pawn on e6 24...Nf5 25.Ne4 Bb4+= 26.Re2 Nd4 27.ed4 Rf1 28.Kf1 Rf8 29.Kg2 Rf5 30.Nf2 Nf6 31.Qh3+= Qc1 32.Re6 g6 33.g4 Rf4 34.g5 Qd2 35.Qe3 Qe3 36.Re3 Rf2 37.Kf2 Ng4 38.Ke2 Threatening mate... how? 38...Ne3 39.Ke3 Kg7 40.Ba2 Be7 41.h4 Bb4 42.Kf3 Kf8+= 43.Bc4 Bc3 44.d5 Ke7 45.Ke2 Kd6 46.Kf3 a3 47.Ke2 ½–½. Schulz,Hans_Juergen – Pilz,Erhard, ETC, 2005.

4.e3 Nf6

(--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 a5)

5.Nf3 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3).

3.Bb2 Bf5

4.a4 e6 5.e3 Nf6 6.c4 Nbd7 7.Nf3 c6 8.Be2 (8.Nd4 Bb1 9.bc6 Be4 10.cd7 Nd7+=) 8...Bb4 (8...dc4 9.Bc4 Bd6 10.Nd4=) 9.0–0 (9.bc6 bc6 10.Nd4 Bb1 11.Rb1 Ne4=) 9...0–0 (9...dc4 10.bc6 bc6 11.Bc4=) 10.d4 (10.bc6 bc6 11.Nd4 Bd6 12.Nf5 ef5=) 10...Re8 (10...dc4 11.bc6 bc6 12.Bc4=) 11.Nbd2 Bd2 (11...cb5 12.ab5 dc4 13.Nc4=) 12.Qd2 Ne4 13.Qc1 h6 14.c5 g5 (14...Qe7!?+=) 15.Nd2+– g4 (15...e5 16.Ne4 Be4 17.de5+–) 16.Ne4 de4 17.Re1 Nf6 18.Bf1 Nd5 19.g3 (19.Rb1 Qd7+–) 19...h5 (19...Qf6 20.Rb1+=) 20.Bg2 Qg5 21.Qc2 Qg6 22.Kf1 h4 23.Ke2 (23.gh4!? Nb4 24.Qe2+=) 23...h3= 24.Bh1 Nb4 25.Qb1 Nd5 (25...b6 26.cb6 cb5 27.Kf1=+) 26.b6 f6 (26...Rad8 27.Kf1+=) 27.Kd1 (27.Kf1 Kg7+=) 27...Qf7 (27...Rec8=) 28.Kc2 (better 28.Be4!? Be4 29.Qe4+–) 28...Qd7 (28...e5!?–/+) 29.Kd1 Ne7 (29...Qh7!?=) 30.Be4+– Be4 31.Qe4 f5 32.Qe5 Qd5 33.Qd5 Nd5 (33...ed5 34.Rf1+–) 34.Kd2 Nf6 35.Ke2 Ne4 36.f3 Ng5 37.fg4 fg4 38.Rf1 Rf8 (better 38...Nf3!?+–) 39.Rf4+– Rf4 40.ef4 (better 40.gf4 Nf3 41.Kf2+–) 40...Nf3+= 41.Rh1 Kf7 (41...Rd8 42.Ke3+=) 42.Ke3+= Rd8 Attacking the backward pawn on d4 43.Ke4 Rd5 44.Bc3 Kg6 45.Bb2 Kf7 46.Bc3 (46.Kd3 Kg8+=) 46...Kg6 47.Ba5?? (better 47.Ke3+=) 47...Kf7?? (better 47...Rd4 48.Ke3 Ra4–+) 48.Bc3+– Kg6 49.a5 Kf7 50.Ke3 (50.Rb1 Rd8 51.Rb2 Ke7+–) 50...Kg6 (50...Rd8 51.Kd3+–) 51.Rb1 Kf5 (better 51...Rd8 52.Rb2 Kf5+–) 52.a6 Rd7 (52...Rd8 53.ab7 Rb8 54.Rb2+–) 53.a7 Rd8 54.Rh1 Re8 55.Be1 (55.Ra1!? Ra8 56.Ra2 Kg6+–) 55...Rd8 56.Bf2 Nd4 (56...Ra8 57.Kd3+–) 57.Kd3 (better 57.Rd1!? e5 58.fe5 Nc2 59.Ke2 Ra8+–) 57...Nb5? (57...Nf3 58.Kc4 e5+–) 58.Kc4 e5 (58...Kf6 59.Ra1 Ra8 60.Bd4 Ke7 61.Be5+–) 59.Be3 (better 59.fe5!? Ke5 60.Re1 Kf6+–) 59...e4 60.Rd1! Rd1 A deflection (60...Ra8+–) 61.a8Q Rc1 (61...Rd3 62.Qf8 Kg6 63.f5 Kh7 64.Qf7 Kh8 65.Qh5 Kg8 66.Qg4 Kh7 67.Qe4 Re3 68.Qe3 Na3 69.Kd3 Nc4 70.Qe7 Kh8 71.f6 Ne5 72.Ke4 Nf7 73.Qf8 Kh7 74.Qg7) 62.Kb3 (62.Bc1 e3 63.Qb7 Kg6 64.f5 Kf6 65.Bb2 Nc3 66.Bc3 Kf5 67.Qf7 Kg5 68.Bd4 e2 69.Be3) 62...Rc3 (62...Rb1 63.Kc2 Rb4 64.Qb7+–) 63.Kb2 (better 63.Kb4!? Re3 64.Qb7 Kf6 65.Qc6 Kg7 66.Kb5 Re1+–) 63...Re3 64.Qc8 (64.Qc8 Kf6 65.Qg4+–; better 64.Qb7 Re2 65.Kb3 Nd4 66.Kc4+–) 1–0. BeepBeepImAJeep (2535) – Clovis99 (2455), lichess.org, 2017.

4.c4 dc4 5.e3 (5.Na3 Nf6=) 5...Bd3 (5...Nf6 6.Bc4 Nbd7 7.Nf3=) 6.Na3 Bf1 7.Kf1 c6 8.Nf3 Qd5 9.Rc1 e6 (9...cb5 10.Nd4 Nf6 11.Ndb5 Kd8+–) 10.Nc4+– Qb5 11.Qe2 Qc5 (11...Qd5 12.Be5 f6 13.Nb6+–) 12.Be5 Qb5?? (better 12...Nf6 13.Nd6 Bd6 14.Rc5 Bc5 15.Bf6 gf6+–) 13.Bg7! Qc4 (13...Bg7 14.Nd6 Double attack) 14.Qc4 Bg7 15.Rb1 b5 16.Rb5! cb5 (16...Ne7 17.Rb7+–) 17.Qc8 Ke7 18.Qb7 Nd7 19.Qa8 Nh6 (19...Ngf6 20.Qa5 Ne4 21.Ke2+–) 20.Qa5 Rc8 (20...Nf5 21.Ke2 Rc8 22.Qb5+–) 21.Qb4 Ke8 22.Ke2 Rc2 (22...Nf5 23.Qb5 Ke7 24.Qd3+–) 23.Qb5 Ra2 (23...Nf5 24.g4 Ne7 25.Qb1+–) 24.Rc1 Ra8 25.Rc7 Rd8 26.Ng5 Bf6 (26...Bf8 27.Nh7 Be7 28.d4+–) 27.Ne4 Be7 28.Qh5 Bf8 (28...Nf5 29.Qh7 Nd6 30.Qg8 Nf8 31.Nd6 Rd6 32.h4+–) 29.g4 Rb8 1–0. calabuig (1975) – decu40 (1950), gameknot.com, 2015.

4.e3 Nf6 5.c4 (5.Nf3 e6=) 5...dc4 (5...e6 6.cd5 ed5 7.Qf3=) 6.Bc4 e6 (6...Nbd7 7.Nf3=) 7.Nc3 (7.Nf3 Bd6=) 7...Bd3 (7...Nbd7 8.Nf3=) 8.Bd3 Qd3 9.Nge2 (9.Nf3 Nbd7=) 9...Bd6 10.h3 (10.0–0 Nbd7=) 10...Nbd7=+ 11.Rc1 (11.Nc1 Qf5=+) 11...Nc5 12.0–0 0–0 13.Rc2 a4 (13...Rfd8 14.Nc1 Qg6 15.d4=+) 14.Nc1 Qf5 15.d4 Nce4 16.N1e2 (16.Ne4 Ne4 17.Qf3 Qd5=+) 16...Ng5 (16...a3 17.Ba1=+) 17.Ng3 Qg6 18.Kh1 (18.h4 Bg3 19.fg3 Nge4=+) 18...Rfd8 ( 18...a3 19.Ba1 Rfd8=+) 19.Qe2? ( 19.a3=+) 19...Bg3–+ 20.fg3 Nge4 21.Ne4 Ne4 22.Qc4 Ng3 23.Kg1 Nf1 24.Kf1 Qf5 25.Rf2 Qb1 26.Bc1 Rac8 27.Rb2 Qf5 28.Rf2 Qe4 29.Qa4 c5 30.bc6 Rc6 31.Qa3 Qb1 32.Qe7 Qc1 33.Ke2 Rc2 34.Kf3 Rf2 35.Kf2 Qb2 36.Kf3 Ra8 37.a3 h6 38.d5 Qf6 39.Qf6 gf6 (40.Ke4 Ra4 41.Kd3 Ra3 42.Kd4 Ra4 43.Kd3 ed5–+) 0–1. Bartle,Georg – Sauer,Daniel, Baden–ch HT1, 2003.

4.Nf3 c5 5.e3 Nf6 6.Be2 e6 7.0–0 Bd6 8.Nh4 Bg6 9.c4 Nbd7 10.f4 Nb6 11.d3 0–0 12.a4 dc4 13.dc4 Be7 14.Ng6 hg6 15.Qc2 Qc7 16.Nd2 Bd6 17.Nf3 Nbd7 18.Rfd1 e5 19.Qd2 e4? (better is 19...Ne8+/–) 20.Qd6+– Qd6 21.Rd6 ef3 22.Bf3 Rab8 (22...Rae8 23.Bb7 Re3 24.Ra6+–) 23.e4 Rfd8 24.Rad1 Kf8 25.e5 (25.e5 Nh5 26.Rd7 Rd7 27.Rd7+–) 1–0. Nemec,Zdenek (1915) – De Paus,Pieter, 30. LSS No Engine Cup Preliminary, 2010.

4.Nf3 Nf6 =.

4.f4 e6 5.Nf3 Nd7 6.e3 Ngf6 7.Be2 Bd6 (7...Bc5 8.Nh4=) 8.d3 (8.Nh4 Be4=) 8...c6 9.Ne5 (9.bc6 bc6 10.Nd4 c5=) 9...0–0 (9...cb5 10.Nd7 Qd7+=) 10.h4 h5 11.Nd7 Nd7 12.Bh5 (12.bc6 bc6 13.Bh5 Rb8=) 12...Qb6 13.Bd4 (13.Qf3 Qb5 14.Bc3 Qa4=+) 13...c5=+ 14.Bc3 d4 15.Bd2 de3 (15...Qb5 16.Na3 Qa4 17.Nc4=) 16.Be3 e5 (16...Qb5 17.Nc3 Qa6 18.Bf3=) 17.0–0 Rae8 (17...ef4 18.Bf4 c4 19.Kh1 Be7=) 18.c4 (18.Nd2 Be6 19.f5+–) 18...ef4=+ 19.Bf4 Bf4 20.Rf4 Qd6 21.Qf1? ( 21.Qd2=+) 21...Bd3–+ 22.Qf2 Nf6 (23.Rf6 Qf6 24.Qf6 gf6–/+; 22...Qe5!? 23.Bf7 Rf7 24.Rf7–+) 0–1. Nguyen Van Huy – Khor Shi Hong, Yungtau U16, 2000.

4.c4 e6

5.cd5 ed5 6.e3 Nd7 7.Nf3 Ngf6 8.Be2 Be7 (8...Nc5 9.0–0=) 9.0–0 0–0 10.Nc3 (10.Nd4 Be6+=) 10...h6 11.Nd4 Bh7 12.d3 Bd6 13.Rc1 Qe7 14.Qb3 Nc5 15.Qc2 (15.Nd5?? Qe5 16.f4 Qd5–+ (16...Nb3 17.fe5 Nc1 18.Rc1 Be5 19.Nc7–/+)) 15...Rfc8 16.Na4 Ncd7 17.h3 Qe5 18.g3 Bg6 19.Bf3 Qe7 20.Rfd1 (20.Bg2 Rd8=) 20...Rab8 (20...Ne5 21.Bg2 Ba3 22.Rb1=) 21.Bg2 Qe8 22.e4 Nb6 23.Re1 de4 24.de4 Bb4 25.Re2 Rd8 (25...Bd6 26.Bf3+=) 26.Qb3 Nfd7 (26...Be4? 27.Nb6 (27.Rc7?! Na4 28.Qa4 Qe5+=) 27...cb6 28.Be4 Ne4 29.Qf3+–) 27.a3 Na4 28.Qa4 Bc5 29.Qa5 Bb6 30.Qb4 (30.Qc3 Ne5 31.Rd2 f6+=) 30...Ne5+= 31.Rd2 f6 32.Rcd1 (32.Bc3 Bf7+=) 32...Ra8 33.Nb3 (33.Rc2 Bf7=) 33...Rd2= 34.Rd2 (worse 34.Nd2 Bf2 35.Kh2 Rd8–/+) 34...Qf8 35.Qf8 Kf8 36.Bd4 Ke7 37.Bb6 cb6 38.Nd4 Ra3 39.Rb2 Ra1 40.Kh2 Nd3 41.Rc2 Nc5 42.Nf5 Kf8 ½–½. calabuig (1975) – forsetinn (2355), gameknot.com, 2015.

5.cd5 ed5 6.Nf3 Nf6 7.e3 Nbd7 8.Nd4 Bg6 9.Be2 Nc5 10.0–0 Ne6 (10...Nd3 11.Bc3=) 11.f4+= Nd4 12.Bd4 (worse 12.ed4 Bf5=+) 12...Bb1 (12...Bf5 13.Nc3+=) 13.Qb1 Be7 14.Rc1 (14.Qc2 Rc8+–) 14...0–0 15.Bf3 Rc8 16.Qd3 Re8 17.Rc2 c5 18.bc6 bc6 19.Rac1 1–0. pcmvr – jvanmechelen, net–chess.com, 2018.

4.e3 Nd7

5.c4 dc4 6.Bc4 e6 7.d4 (7.Nf3 Ngf6=) 7...Bb1 (7...Nb6!? 8.Be2 Nf6+=) 8.Rb1+= Bb4 9.Kf1 Nb6 (9...Ngf6 10.Nf3+=) 10.Bd3+= Nd5 11.a3 Bc3 12.Qg4 (12.Bc1 a4+=) 12...Qf6 (12...Ngf6 13.Qe2 h6=) 13.Bc1= a4 (13...Nge7 14.Ne2+/–) 14.Ne2+= Ba5 (14...Nh6!? 15.Qh3 Ba5+/–) 15.e4+/– h5 16.Qg3 h4 17.Qg4 Nc3 18.Bg5 Qg6 (18...Nb1 19.Bf6 Nd2 20.Kg1 Nf6 21.Qf4+/–) 19.Nf4+– Nf6 (19...Qh7 20.e5 g6+–) 20.Ng6 Ng4 21.Nh8 Nb1 22.Bb1 Bc3 23.f3 Nf6 24.d5 ed5 25.ed5 Nd5 26.Ba2 c6 27.bc6 bc6+/– 28.Ke2 Bb2 29.Kd2 Ba3 30.Rb1+/– f6 31.Bh4 0–0–0 32.Bd5 Rd5 33.Ke2 g5 34.Bg3 Bd6? 35.Bd6 Rd6 36.Ra1 Rd4 37.Ke3 Rh4 38.Ng6 Rh2 39.g4 Kd7 40.Ra4 Ke6 41.Re4 Kd6 42.Ne7 Rh7 43.Nf5 Kd5 44.Rd4 Ke5 45.Re4 Kd5 46.Ra4 Rb7 47.Rd4 Ke5 48.Rd3 c5 49.Nd6 Rc7 50.Nc4 Ke6 51.Rd6 Kf7 52.Ke4 Re7 53.Kf5 Re2 54.Rf6 Kg7 55.Kg5 Rc2 56.Rf4 Rc3 57.Kf5 Kh6 58.g5 Kh7 59.Kf6 Kh8 60.Kf7 Rc1 61.Rh4 1–0. Wawricka,A (2030) – Arztmann,Nils (1895), Feistritz AUT, 2012.

5.c4 e6 6.cd5 ed5 7.a4 Ngf6 8.Nf3 Bd6 9.Nc3 0–0 10.Be2 h6 11.Qb3 Nc5 12.Qa2 c6 13.bc6 bc6 14.0–0 Na6 15.Ba3 Nb4 16.Bb4? (better 16.Qb3!?–/+) 16...ab4–+ (16...Bb4?! 17.Nd4 Bd7 18.Qc2=+) 17.Nd1 c5 18.Bb5 (18.a5 c4–+) 18...Bc7 (18...c4 19.a5 Be4 20.Bc6–+) 19.d4 (19.Nh4 Bd7 20.Bd7 Qd7–+) 19...c4 20.Bc4 (20.Ne5–+) 20...dc4 21.Qc4 Qd6 (21...Bd6 22.Ne5–+) 22.g3 (22.Nb2 Rfc8–+) 22...Bh3 (22...Ne4 23.Rc1 Ba5 24.Qb5–+) 23.Nb2 (23.Re1 Qe7–+) 23...Rfc8 (23...Bf1 24.Rf1 Rfc8 25.Rc1–+) 24.Rfc1 Ne4 25.Nd3 (25.Ne5 Qf6 26.f4 Be5 27.Qd3–+) 25...Qf6 26.Nde1 (26.Nf4 Bf4 27.Qd3 Ng3 28.hg3 Bg3 29.Qe2–+) 26...Bg3 27.Qc8 Bc8 28.hg3 (28.fg3 g5 29.h3 Bh3–+) 28...Bg4 29.Kg2 Qf5 (better 29...Ra5!? 30.Ra2 Rf5 31.Rc8 Kh7 32.Re8–+) 30.Rc4 (30.Rc2 f6–+) 30...Qh5 31.Nh4 (31.Rb4 Qh3 32.Kg1 Ng3 33.fg3 Qg3 34.Kf1 Bf3–+) 31...g5 32.d5 (32.Nhf3 b3 33.Ng1 b2–+) 32...Nf2 (better 32...gh4 33.Re4 Qd5 34.f3 Bf3 35.Nf3 Qe4 36.gh4–+) 33.Kf2 gh4 34.gh4 (34.Rb4 hg3 35.Kg3 Qe5 36.Kf2 Qa1 37.Rg4 Kf8 38.Nf3–+) 34...Qh4 35.Kg1 Qg3 36.Kf1 h5 37.Ng2 h4 38.Rb4 h3 39.Nf4 (39.Rg4 Qg4 40.Ne1 h2 41.Kf2 h1Q 42.Nd3 Qgf3) 39...Bf3 (39...h2 40.Rb8 Rb8 41.Nh3 h1Q 42.Ng1 Qhg1) 40.Ra2 Kg7 (40...h2 41.Rh2 Qh2 42.Rc4 Kg7 43.Nh5 Bh5 44.d6 Rb8 45.Rc1 Rb2 46.Rc2 Rc2 47.a5 Qf2) 41.d6 Rd8 (41...Rc8 42.Nd3 h2 43.Rg4 Bg4 44.Rh2 Qh2 45.d7 Rc2 46.d8Q Qh1) 42.Rd4 Rb8 43.Rad2 (43.Rd1 h2 44.Nh5 Bh5 45.Rh2 Qf3 46.Kg1 Qd1 47.Kf2 Rb2 48.Kg3 Qg4) 43...Rb1 44.Rd1 Bd1 45.Rd1 (45.Ne6 Kh8 46.Rd1 Qf3 47.Kg1 Qg2) 45...Qf3 46.Kg1 Rd1 47.Kh2 Rh1 0–1. dbinc007 – hexchess, gameknot.com, 2018.

5.d4 e6 6.Nf3 Ngf6 7.Be2 c5 (7...Bb4 8.c3 Bd6 9.0–0=) 8.c4 (8.0–0 Bd6=) 8...cd4 (8...dc4 9.Bc4 cd4 10.Bd4=) 9.ed4 (9.Nd4 Bb1 10.Rb1 dc4=) 9...Bb1 (9...dc4 10.Nbd2=+) 10.Rb1 Bb4 11.Nd2?? (better 11.Kf1 dc4 12.Bc4=+) 11...Ne4–+ 12.Bc1 Qf6 13.0–0 (13.Bf3 Qd4 14.Be4 Qe4 15.Kf1 Qd3 16.Kg1 dc4 17.Qf3–+) 13...Nc3 (13...Qd4?! 14.Ne4 Qe4 15.Bb2=+) 14.Qe1 (14.Rb4 Nd1 (worse 14...ab4 15.Qe1–+) 15.Rb3 Nf2 16.Rf2 Qd4–+) 14...Nb1 15.Bd3 (15.cd5 Qd4 16.de6 fe6 (worse 16...Bd2 17.ed7 Kd7 18.Qd1–+) 17.Bh5 Ke7–+) 15...Qd4 (better 15...Nd2 16.Bd2 Qd4 17.Bb4 ab4–+) 16.Bb1 dc4 17.Qe2 (17.a3 Bc3–+) 17...Bd2 18.Bd2 c3 (18...Qb2!? 19.Qe3 Qb5 20.Be4–+) 19.Be3 Qb4 (19...Qa4 20.Bd3–+) 20.Qd3 (20.Qf3 Qb5 21.Bd4 0–0–+) 20...Ne5 (20...Rc8 21.Rc1–+) 21.Qe4 (21.Qd4 Qb5 22.Bf4 f6 23.Qc3 Ng6–+) 21...Qb5 (21...Qe4 22.Be4 Rc8 23.Bb7–+) 22.Bc2?! (22.Bd4 Nc4 23.Bd3–+) 22...Rd8 (22...Nc6 23.Rb1 Qe2 24.h3–+) 23.h3?? (better 23.Ba4 Qc6 24.Bc6 Nc6 25.Qg4+–) 23...Nc4 (23...f5 24.Qf4 Nc4 25.Rb1–+) 24.Bb3 (24.Bd3 Qd5 25.Qc4 Qd3 26.Qc5–+) 24...Ne3 (better 24...Nb2–+) 25.Ba4–/+ Nf1 (better 25...0–0!? 26.Bb5 Nf1–/+) 26.Bb5+= Kf8 (26...Ke7!? 27.Qb7 Kf6 28.Bf1 Rc8+–) 27.Bf1 b5? (better 27...Rd5!? 28.Qc4 g5+–) 28.Bb5+– h5 (28...Kg8 29.Qc6+–) 29.Qc4 Rb8 (29...Rd5 30.a4+–) 30.a4 (30.Qc7 Ra8 31.Bc6 Kg8 32.Ba8 Kh7+–) 30...Rh6 (30...g6 31.Qc5 Kg7 32.Qc3 Kh7 33.Qa5+–) 31.Qc3 (better 31.Qc7 Ra8 32.Bc6 Re8+–) 31...Rf6 (31...Ra8+–) 32.Qc7 Ra8 33.Bc6 Ra6 (33...Re8 34.Qd6 Kg8 35.Be8 g6+–) 34.Qd8 1–0. GuestHCCV – GuestWXWH, freechess.org, 2018.

5.Nf3 e6 6.Bd3 Bd3 7.cd3 Ngf6 8.0–0 Bd6 9.Nc3 0–0 10.d4 h6 11.d3 c5 (11...e5 12.Qc2=) 12.bc6 bc6 13.Rb1 Qc7 14.e4 de4 15.de4 e5 16.g3 Rfe8 17.Qc2 Rab8 18.Rfd1 ed4 19.Nd4 Be5 20.Nf5 (20.Kg2 Rb4 21.Nf5 g6=) 20...Qa7 21.Kg2 Qc5 22.Rbc1 (22.Rdc1 Bc3 23.Qc3 Qc3 24.Bc3 Rb1 (worse is 24...Ne4 25.Bg7 Rb1 26.Rb1+/–) 25.Rb1 Re4=) 22...g6 23.Nh4 (23.Ne3 Qb4 24.Rb1 Qc5=) 23...Qb6 (23...Rb7 24.Nf3 Bc3 25.Qc3 Qc3 26.Bc3 Ne4 27.Ba5=) 24.Ba1 Nc5 25.Rb1 (25.f3 Qb4=) 25...Qa6 (25...Qa7 26.f3=) 26.Rb8+= Bb8 Can e4 get defended? 27.Nf3 Qc4 The pressure on e4 grows (27...h5 28.e5 Ng4 29.Ne4 Ne4 30.Qe4+–) 28.Nd2 Qe6 29.f3 Be5 30.Ne2 Ba1 31.Ra1 Rd8 32.Nc4 (worse is 32.Qc5 Rd2 33.Qe3 Ra2 34.Ra2 Qa2–/+) 32...a4 33.Rf1 Qd7 34.Qc3 Qe7 35.Ne5 Qd6 36.Re1 (36.Rc1 Nfe4 37.fe4 Ne4+/–) 36...Nh7 37.Rc1 Nd3 38.Nd3 Qd3 39.Kf2 Qd2 40.a3 Qa2 41.Rc2 (worse is 41.Qc6 Rd2 42.Qb5 Qa3 43.Rc8 Nf8=) 41...Qb1 42.Nc1 Rb8 43.Qc6 Rb2 44.Re2 Ng5 45.h4 (45.Qc3 Rb7+=) 45...Ne6 46.Qc8 (46.Qc3 Rb7 47.Rd2 g5+=) 46...Kh7= 47.Qc3 Rb7 48.Qe3 (48.Re1 Qb6 49.Qe3 Qc7=) 48...h5 49.Re1 (49.e5 Rb5=) 49...Qc2 50.Qe2 (50.Re2 Qc4+=) 50...Nd4+= 51.Qc2 Nc2 52.Rg1 Na3 53.Nd3 Rb3 54.Nc5 Rb2 55.Ke3 Nc4 56.Kd4 Nd2 57.Ra1 Nb3 58.Nb3 Rb3 59.Ra4 Rf3 60.Ra7 Kg8 61.e5 Rg3 62.Ra8 Kh7 63.Ra7 Rg4 64.Kd5 Kg8 (64...Rh4 65.e6 Rh1 66.e7+=) 65.Ra8 Kg7 66.Ra7 Rf4 (66...Rg1 67.e6 Rd1 68.Kc4+=) 67.e6= Rf6 (67...Rh4?? 68.e7 Rf4 69.e8Q Rf5 70.Ke4+–) 68.Rf7 Rf7 69.ef7 Kf7 70.Ke4 Kf6 71.Kf4 Kg7 72.Ke4 Kh6 ½–½. marekt (2165) – calabuig (2080), gameknot.com, 2015.

5.Nf3 e6 6.Be2 h6 7.d3 (7.Nd4 Bg6=) 7...Ngf6 8.Nbd2 Bd6 (8...Bb4 9.0–0=) 9.c4= Nc5 10.Qc2 0–0 11.Bd4 (11.0–0 dc4 12.Nc4 Nd3 13.Nd6 Qd6 14.Bf6 gf6=) 11...Nfd7 (11...Qe7 12.Rc1 b6 13.cd5 ed5 14.0–0=) 12.0–0= Re8 13.e4 (13.h3 Qe7=) 13...de4 14.Ne4 e5 15.Bc3 Ne4 16.de4 Bg6 17.Rad1 Qe7 18.Rfe1 (18.Bd3 Nc5+=) 18...Bb4+= 19.Bd3 Bh5 (19...Rad8 20.h3+=) 20.Be2 Bg6 21.Bd3 Rad8 22.Re3 (22.h3 Nc5+=) 22...Bc3–/+ 23.Qc3 Nc5 24.Rd2 Bh5 25.Bc2 (25.Be2 Bf3 26.Bf3 Rd2 27.Qd2 b6–/+) 25...Bf3–/+ 26.Rf3 Rd2 27.Qd2 b6 28.Rg3 Qf6 29.Qe2 Rd8 30.h3 Rd4 31.Kf1? (better is 31.Rc3!?–/+) 31...Qf4–+ 32.Re3 (32.Qe3 Rc4 33.Bb3 Re4 34.Qf4 ef4–+) 32...Qh2 33.f3 Ne6 34.Kf2 (34.Qf2 Nf4 35.Re1 Qh1 36.Qg1 Qg1 37.Kg1–+) 34...Nf4 35.Qf1 Rd2 36.Ke1 Rc2 37.Kd1 Ng2 38.Rd3 Ne3! 0–1. decu40 (1925) – calabuig (2080), gameknot.com, 2015.

4.e3 e6

5.c4 Nf6 6.a4 dc4 (6...Be7 7.cd5 Qd5 8.d3 Bb4 9.Nc3=) 7.Bc4 Bb4 (7...Nbd7 8.Nf3=) 8.Nf3= Nbd7 9.0–0 0–0 10.Ba3 (10.d4 Nd5=) 10...Nb6 11.Bb3 (11.Be2 Nfd5=) 11...Bd3=+ 12.Re1 Qd6 13.Nd4 (13.Bc2!?=+) 13...e5–/+ 14.Nf3 e4 (14...Nbd7 15.Bb2–/+) 15.Nd4 Rfe8 (15...c5 16.bc6 bc6 17.Bc2–/+) 16.Nf5 (16.Bc2 Ba3 17.Na3 Bc2 18.Qc2 Ng4=+) 16...Qe5 17.Nd4 Nbd7 (17...Nbd5 18.Bd5 Qd5 19.Nc3–/+) 18.Nc3 Ba3 (18...Nc5 19.f3–/+) 19.Ra3 Rad8 20.Bc2 (20.f3 ef3 21.Nf3 Qd6=+) 20...Qd6 21.Nb1 Nc5 (21...Bc2 22.Qc2 Ng4 23.f4–/+) 22.Bd3 (22.f3 Qe7=+) 22...Nd3–/+ (22...ed3?! 23.Nc3=+) 23.Rf1 Re5 (23...Ne5 24.Rc3–/+) 24.f3=+ Rh5 (better 24...Rd5 25.Qe2 Rh5=+) 25.h3? (better 25.g3 Rd5 26.fe4 Rd4 27.e5 Qe5 28.ed4 Qd4 29.Kg2 Qe4 30.Kg1=+) 25...Rh3!–+ 26.gh3?? (26.f4 Rh5 27.Rc3–+) 26...Qg3 27.Kh1 Rd5 28.Qe2 (28.f4 Qh3 29.Kg1 Qg3 30.Kh1–+) 28...Qh3 29.Qh2 Qf1 (29...Qf1 30.Qg1 Rh5) 0–1. Hasler,Ueli – Valverde,Mario (1995), CiF, 2005.

5.c4 Nf6 6.a4 Nbd7 7.Nf3 Bb4 (7...Bd6 8.cd5 ed5 9.Be2=) 8.Be2 (8.cd5 ed5 9.Be2 Qe7=) 8...Nc5 (8...dc4 9.Bc4 Nb6 10.Be2=) 9.0–0 (9.cd5 Qd5 10.0–0 Nb3+=) 9...Nd3–/+ 10.Bd3 (10.Bd4 dc4 11.Ne5 Qd5–/+) 10...Bd3 11.Re1 dc4 12.Ne5 Qd5 (12...Bb1 13.Rb1 Bd2 14.Re2–/+) 13.Nd3 (13.Bd4 Nd7 14.Nd3 cd3–/+) 13...Qd3 (13...cd3!? 14.Nc3 Qf5–/+) 14.Qf3+= Ne4 The pressure on the backward pawn d2 grows (14...Qd5 15.Qd5 ed5 16.Bf6 gf6 17.Kf1+=) 15.Bg7 Rg8 16.Be5 Rc8 (16...Qd5 17.Bc7 Rc8 18.Bb6+=) 17.Nc3= Nc5 (17...Bc3 18.dc3 Qd5=) 18.Qf4 (18.Bd4!? c6 19.Bc5 Bc5 20.Ne4=) 18...Qg6+= Do you see the mate threat? 19.Qf3 Nd3 (19...c6!? 20.Re2 Nd3+=) 20.Qb7= Kd8 21.Bg3 Ne1 22.Re1 Qd3 23.Bh4 Be7 24.Bg3 Qd7 25.Qe4 Qd3= 26.Qb7 Qd7 27.Qa6+= Bb4 28.Bh4 Ke8 29.Ne4+/– Rg6 30.Nf6+– Rf6 31.Bf6 Rb8 32.Qa7 Rc8+/– 33.Qb7 c6+= 34.Qa6 cb5+= 35.ab5 Rb8 36.b6+= Qd2 37.Ra1+= Attacks the isolani on a5 37...c3 38.Qb5 Kf8 39.Qg5?? Rb6?? 40.Qg7+/– Ke8 41.Qg8 Kd7?? 42.Qf7+– Kc6 43.Qe6 Kb7 44.Qf7 Ka6 45.Qc4 Kb7 46.Qf7?? Ka6= 47.Qc4?? (47.Be5 c2 48.Qc4 Rb5 49.Qc8 Rb7 50.Rf1=) ½–½. Vera,G – Da Silva,S, Sao Paulo, 2004.

5.c4 Nf6 6.a4 h6 7.Nf3 Bd6 8.Be2 0–0 9.0–0 Nbd7 10.d4 Re8 (10...dc4 11.Nbd2=) 11.Nbd2 b6 12.Rc1 e5 (12...Ne4 13.cd5 ed5 14.Qb3 Nd2 15.Nd2+=) 13.de5+= Ne5 14.Ne5 Be5 15.Be5 Re5 16.Nf3 Re8 17.Nd4 Bg6 18.cd5 Nd5 19.Nc6 Qd6 20.Bc4 Nb4 21.Qd6 cd6 22.Rfd1 Bc2 23.Rd6 Ba4 24.Nb4 ab4 25.Rb6 The passed pawn on b5 will quickly become a dangerous weapon 25...Rec8 26.f3 Bb3 27.Rc6 (27.Bb3 A pinning theme 27...Rc1) 27...Bc4? (27...Rc6 28.bc6 Bc4 29.Rc4+–) 28.R1c4 (28.R6c4 Re8+–) 28...Rcb8? (better 28...Rc6 29.bc6 b3+–) 29.Rb4+– Ra5 30.b6 Ra6 31.Kf2 Kf8 32.h4 Ke7 (32...Rb7 33.e4+–) 33.Rc7 Ke6 (33...Kd6 34.Rd4 Ke6 35.b7+–) 34.Re4 (better 34.b7 Ra7 35.Rb6 Kd5 36.Kg3+–) 34...Kf6 (34...Kd6 35.Rd4 Ke6 36.b7+–) 35.Rf4 (35.Rc6 Kf5 36.g4) 35...Kg6 (35...Ke5 36.b7 (worse 36.Rcf7 Rbb6 37.Re4 Kd6+–; worse 36.Rff7 Ra2 37.Kg3 Rb6 38.f4 Ke4 39.Rfe7 Kd5+–) 36...f5 37.Rb4+–) 36.Rff7 (36.b7 f6 37.h5 Kh7+–) 36...Rab6 (36...Ra2 37.Kg3 Rb6 38.Rg7 Kf5 39.h5+–) 37.Rg7 (better 37.h5 Kh7 38.Rg7 Kh8 39.g4+–) 37...Kh5 (37...Kf6+–) 38.Rc4 (38.Rc5 Kh4 39.Rg4) 38...Rb2+– 39.Kg3 R8b4 (39...Rg2 40.Kg2 Rb2 41.Kf1 Rf2 42.Ke1 Rf3+–) 40.Rc5 1–0. BeepBeepImAJeep (2745) – Zutano (2515), lichess.org, 2020.

5.c4 Nf6 6.cd5 ed5 7.Qf3 Be4 8.Bf6 gf6 =.

5.Nf3 Nf6 6.a3 Bd6 7.Be2 h6 8.0–0 Nbd7 9.c4 0–0 10.cd5 ed5 11.Nc3 Qe7 12.Na4 (12.Nd4 Bh7=) 12...Rfc8 (12...Be4 13.d3 Bg6 14.Nd4=) 13.Nd4= Bh7 14.f4 Rab8 15.Nb3 (15.Bc3 c6 16.bc6 bc6 17.Ba5 c5=) 15...c5 16.Na5 (16.Bg4 Re8=+) 16...Qd8 17.b6 (17.Bc3 Ne4 18.Nb3 Ra8=+) 17...Nb6=+ 18.Bf6 gf6 19.Nb6 Qb6 20.Nb3 c4 21.Nd4 Bc5 22.Nc2 d4 (22...Kh8 23.f5=+) 23.Nd4 Bd4 24.ed4 Qd4 25.Kh1 b5 26.Bh5 Re8 27.Qg4 Kf8 28.Qg3 (28.Qh4 Bf5=+ (28...Qd2 29.Qf6 Qd5 30.f5 Bf5 31.Qh6 Ke7 32.Rae1 Kd7 33.Rd1+–)) 28...Rb6 29.h3 (29.Bf3 Bc2 30.Rae1 Re1 31.Re1 Qd2–/+) 29...Bd3–/+ 30.Rg1 Re4 (30...Ra6 31.Rge1 Rae6 32.Rg1–/+) 31.a4 (31.Rae1 Rbe6–/+) 31…b4 (31...b4 32.a5 Rb5–/+) 0–1. marekt (2135) – forsetinn (2400), gameknot.com, 2015.

5.Nf3 Nf6 6.a3 Nbd7 7.Be2 Bd6 8.Nd4 Bg6 9.f4 e5 10.fe5 Ne5 11.0–0 0–0 12.Nc3 Qe7 13.Nf5 Bf5 14.Rf5 Rae8 15.Qf1 c6 16.g3 Qe6 17.Rb1 Rd8 18.Bd3 Nfg4 19.Be2 g6 (19...Rfe8 20.bc6 bc6 21.Rf4=) 20.Rf4+= f5 21.Ra4 Bc7 22.Qg2 Nd7 23.Bc1 Ra8 24.Bf3 (24.h3 Ngf6 25.bc6 bc6 26.Bb2–/+) 24...Nc5+= 25.Rd4 Ne4 26.bc6 bc6 27.Bg4 Nc3 (worse is 27...fg4 28.Ne4 de4 29.Rb7= (29.Qe4? Qf7 30.Bb2 Rab8–+; 29.Re4? Qa2 30.Rb7 Qc2–+)) 28.Bf5 Rf5 29.dc3 Raf8 0–1. marekt – pgcbies, ChessWorld.net, 2015.

5.Nf3 Nf6 6.Be2 h6 7.0–0 Nbd7 8.d3 (8.Nd4 Bg6=) 8...Be7 9.Nbd2 0–0 10.Nh4 Bh7 11.a4 c6 12.bc6 bc6 13.Nb3 Qc7 14.Qd2 c5 15.Bc3 (15.Rab1 Rfc8 16.Ba3 Nb6–/+) 15...Rfc8=+ 16.Ba5 (16.Rfc1!?=+) 16...Qa7–/+ 17.Bc3 c4 18.Nd4 Nc5 The isolani on a4 becomes a target 19.Bb4 (19.Nb5 Qd7 20.Nf3 (20.dc4? Nfe4 21.Qd1 Na4–+) 20...Na4 21.Rab1 cd3 22.cd3–+) 19...Nfe4–/+ 20.de4 Ne4 21.Qe1 Bh4 22.a5 Bf6 23.Qd1 Rab8 24.c3 (better 24.Rb1!?–/+) 24...e5–+ 25.Nc2 (25.Nf3 d4 26.Qc1 Rc6–+) 25...d4 26.cd4 (26.Bg4 Rd8 27.cd4 ed4 28.ed4 Bd4 29.Nd4 A) 29...Rb4?! 30.Nc6 Rd1 31.Rad1= (worse 31.Na7 Ra1 32.Ra1 Nc5–/+); B) 29...Rd4–+) 26...ed4 27.ed4 Nf2 28.Rf2 (28.Kf2 Bc2 29.Qc2 Bd4 (29...Rb4?! 30.Rad1–+) 30.Kg3 Ba1–+ (30...Rb4?! 31.Rab1 Rb1 32.Qb1–+)) 28...Bc2 29.Qc2 Rb4 30.Qf5 (30.Kh1 Bd4 31.Rff1 Ba1 32.Ra1 Qc7–+) 30...Rc7 31.Rd1 Bd4 32.a6 (32.Kf1 g6 33.Qf4 Bf2 34.Qf2 Qa5 35.Qf6–+) 32...g6 33.Qf4 (33.Qe4 Bf2 34.Kf1 Re7–+) 33...c3 34.Kh1 (34.Rd4 Rd4 35.Qc1–+) 34...Bf2 35.Qb4 c2 36.Rd8 (36.Qd2 Qe3 37.Qe3 Be3–+) 36...Kh7 37.Qf8 c1Q 38.Bd1 Qd1! 39.Rd1 Rd7 40.Rc1 Qd4 41.h3 Bg3 42.Rf1 Qf2! 43.Rg1 (43.Rf2 Rd1 Mate attack) 43…Qg1! (43...Qg1 44.Kg1 Rd1) 0–1. decu40 (1925) – forsetinn (2405), gameknot.com, 2015.

4.Nf3 e6

5.a4 Nd7 6.d3 Ngf6 7.Nbd2 c6 8.c4 Bb4 9.e3 dc4 10.dc4 Ne4 11.Be2 (better 11.Bg7!? Rg8 12.bc6=+) 11...Ndc5–/+ 12.0–0? (better 12.bc6 bc6 13.Bd4–/+) 12...Bd2–+ 13.Nd2 Nd2 (13...Nd2 14.Re1 cb5 15.cb5 0–0–+) 0–1. jvanmechelen – pcmvr, net–chess.com, 2020.

5.c4 dc4+= 6.Nc3 Nd7 7.e4 Bg6 (7...Bg4 8.Bc4 Ne5 9.Be2 Bf3 10.gf3 Nd3 11.Bd3 Qd3 12.Qe2=) 8.Bc4= Ngf6 9.Qe2 Nb6 10.0–0 Bh5 11.d3 Nfd7 12.e5 Bb4 13.a3 Bc3 14.Bc3 Nc5 15.Qe3 Bf3 16.Qf3 (worse is 16.Qc5 Na4 17.Qe3 Bg2+=) 16...Nc4 17.dc4 Qd3 18.Qd3 Nd3 19.Rfd1 0–0–0 20.Kf1 Nc5 21.Ke2 (worse is 21.Ba5 Nb3 22.Bb4 Na1 23.Ra1 Rd4–/+) 21...Nb3 22.Rab1 a4 23.f3 c6 24.bc6 bc6 25.Ke3 Kc7 ½–½. pcmvr (2845) – jessamine (2830), net–chess.com, 2012.

5.e3 Nd7 6.c4 Ngf6 (--> 1.b4 d5 2.Bb2 Bf5 3.e3 Nf6 4.Nf3 e6 5.c4 a5 6.b5 Nbd7).

5.e3 Nd7 6.Bd3 Ngf6 7.Bf5 ef5 8.0–0 Be7 (8...Bd6 9.Bd4=) 9.Nc3 0–0 10.Ne2 g6 (10...Bd6 11.Ned4 g6 12.d3=) 11.Rc1 Bd6 12.d3 c5 13.bc6 bc6 14.c4 Rb8 15.Ba1 (15.Bf6 Qf6 16.cd5 cd5=) 15...dc4 16.Rc4 c5 17.h3 Re8 18.Rc1 Qc8 19.Qc2 Nd5 20.Nc3 Nb4 21.Qd2 Qd8 (21...Nf6 22.Ne2 Qe6 23.Rb1=) 22.a3+= Nc6 23.Na4 Rc8 24.Rfd1 Nce5 (24...Qe7 25.Rc2+=) 25.Ne5 Be5 (25...Ne5 26.Be5 Re5 27.Rc4+=) 26.Rc4 (26.Be5 Re5 27.Qc2 Re8+=) 26...Qe7 (26...Ba1 27.Ra1 Ne5 28.Rc3+/–) 27.Qc2+/– Bb8 28.d4 Qd6 29.g3 (29.Nc5? Qh2 30.Kf1 Nb6–+) 29...Qc6 (29...Rcd8 30.d5 Rc8 31.Qc1+/–) 30.Rd3 (30.d5 Qd6+/–) 30...Re7 (30...Red8 31.Bb2+/– (worse is 31.Nc5 Nb6+=)) 31.Nc5 Nb6 32.Rcc3 Rce8 (32...Ree8 33.Nb3 Qa4 34.Qb2+/–) 33.Na6 Qa8 (33...Qf3 34.Nb8 Rb8 35.d5+–) 34.Nb8 Rb8 35.d5 Nd5 36.Kh2 Nf6 (36...Rd7 37.Rc6 Rf8 38.Rd5 Rd5 39.Qc3+–) 37.Rc6 Ne4 (37...Ne8 38.Qc3 f6 39.Rf6+–) 38.f3+– (38.f3 Ng5 39.e4+–) 1–0. forsetinn (2400) – calabuig (2045), gameknot.com, 2015.

5.e3 Nd7 6.Nd4 Bg6 7.Be2 Ngf6 8.0–0 Bd6 9.f4 Qe7 10.Qe1 a4 11.a3 Bc5 12.Nc3 Bd4 13.ed4 Bc2 14.Rc1 Bb3 15.Nd1 Rc8 16.Ne3 Ne4 17.d3 Nd6 18.Bf3 Nf6 19.Qb4 0–0 20.Rfe1 Qd7 21.b6 (21.Rc5 Nf5 22.Nf5 ef5+=) 21...c6= 22.Ng4 (22.g4!?=) 22...Ng4–/+ 23.Bg4 Qd8 24.Re3 (24.Qc5 Nb5–/+) 24...g6 25.Qc5 Nb5 26.Rh3 Re8 27.Re1 Qf6 28.Rf1 Ra8 29.Rg3 Qd8 30.Re1 Ra6 31.Qc1 Rb6 32.Qd2 Ra6 33.Re5 Ra8 34.Qe1 Kf8 (34...Qd6 35.f5 Kg7 36.Bf3–/+) 35.Rge3 Nc7 36.Rh3 Kg7 37.Qc1 Kg8 38.Qe1 Kh8 (38...b6 39.Qc1 Qd7 40.f5=) 39.Qf2 Rg8 40.Bc3 Nb5 41.Bb4 Rg7 42.Qe3 (42.Rh6 Kg8–/+) 42...c5 43.dc5 (43.Bc5 Nc7 Combination; 43.dc5 f6 Combination) 43...f6 Black plans d4 44.Re6 d4 45.Qe2 (45.Qe1 Be6 46.Be6 Qe8–+) 45...Nc3 46.Qe1 (46.Qf2 Be6 47.Be6 f5–+) 46...Be6–+ 47.Be6 (47.Qe6 Qe8 48.Kf1 f5 49.Qe8 Re8–+) 47...Qe8 48.Kf1 (48.Rh6 Qc6 49.Bg4 Re8–+) 48...Qc6 49.Bg4 Re8 50.Qd2 f5 51.Bf3 Qf6 52.Kf2 Rd7 53.c6? (53.Rg3–+) 53...bc6 54.Kg3 (54.Bc5 Kg8 55.Bb4 Rb7–+) 54...Rb7 55.Rh4 (55.Qc1–+) 55...Rb4! 56.ab4 Re3 57.Qb2 (57.b5 cb5 58.Kh3–+) 57...Ne2 58.Kh3 g5 0–1. housemd (1965) – forsetinn (2415), gameknot.com, 2015.

5.e3 Nf6 6.Be2 Bd6 7.Nh4 Bg6 8.Ng6 hg6 9.g3 Nbd7 10.c4 dc4 11.Bc4 Be7 (11...Nb6 12.Be2=) 12.Qf3 Rb8 13.0–0 Nb6 14.Be2 g5 15.Bc3 g4 16.Qg2 (16.Qf4 Nbd5 17.Qa4 Rh5=) 16...a4 17.Bf6 (17.Rc1 Nbd5=) 17...Bf6+= (worse is 17...gf6 18.Bg4 Qd3 19.Bf3+=) 18.d4 Qd5 (18...Bd4 19.ed4 Qd4 20.Na3=) 19.Qd5 Nd5 20.Bg4 e5 21.a3 (21.e4!? Nb4 22.a3+=) 21...ed4= 22.ed4 Bd4 23.Ra2 c5 24.bc6 bc6 25.Re1 Kd8 26.Rd2 c5+= 27.Bf3 Nb6 28.Rde2 Nc4 29.Bd5 Ne5 30.Kg2 Kc7 31.f4 Ng4 32.Bf7 Rh2 33.Kf3 Re2 34.Re2 Nh6 35.Ba2 Nf5 36.Rd2 Nd6 37.Rd3 Rb2–/+ Black fights for the Initiative 38.Rd2 Kc6 39.Rb2 Bb2 40.Be6 Nb5 41.Bf7+= Kb6 42.Be8 Ka5 43.Ke2 Na3 44.Na3 Ba3 45.Bf7 Kb4 46.Kd3 Bb2 47.f5 Ka3 48.g4 Bf6 49.Kc2 Kb4 50.Kd3 Be7 51.Bc4 a3 ½–½. Van Rooijen,Peter (1690) – Hlavacek,Ladislav (1885), TE.2004.P.01701, 2004.

5.e3 Nf6 6.Be2 Bd6 7.Nh4 Bg6 8.Ng6 hg6 9.h3 Ne4 10.Bg7 Qh4 11.0–0 Rh5? ( 11...Ng5 12.Bg4 f5 13.Bh8 Qh8+=) 12.Bh5+– gh5 13.Bd4 Nd7 14.d3 Nf2?? (14...Ng5 15.Qe2 0–0–0+=) 15.Rf2 Qg3 (15...Bh2 16.Kf1+–) 16.Qh5 0–0–0 17.Nd2 (17.Qf7?! Rf8 18.Qf8 Bf8+–) 17...Qh2 (17...f5 18.Nf1 Qg8 19.Rc1+–) 18.Kf1 Bg3 (18...Qg3+–) 19.Nf3 Qh1 20.Ke2 (20…Qa1 21.Ba1 Bf2 22.Kf2+–) 1–0. Bonetti,Shane – alo, ICC, 2002.

5.e3 Nf6 6.Be2 Nbd7 (6...Bg4 7.0–0=) 7.0–0 (7.Nh4 Be4=) 7...Bg6 (7...Bg4 8.h3 Bf3 9.Bf3=) 8.d4 c5 (8...Bd6 9.c4=) 9.c4 cd4 (9...Rc8 10.Nbd2=) 10.Nd4 (10.Bd4 Rc8 11.Nbd2 Bd6+=) 10...Rc8 (10...Bd6 11.cd5 Nd5 12.Nd2=) 11.cd5 (11.Nd2 e5 12.N4f3 Bd6+=) 11...Nd5 12.Na3 (12.a3 N7f6=) 12...Ba3=+ 13.Ba3 Nc3 14.Qe1 e5 15.Nf3 (15.Bg4 ed4 16.ed4 Ne4=) 15...b6 (15...Ne2 16.Qe2 Bh5 17.Rfc1+=) 16.Rc1= Na2 17.Rc6 Be4 (17...Ra8 18.Qd2 Nb4 19.Rd6+=) 18.Qd2 (18.Qa1 Nb4 (18...Bc6? 19.bc6 Nc5 20.Qa2+–) 19.Bb4 ab4 20.Rc8 Qc8 21.Ne5 0–0+=) 18...Nb4 19.Rc8 Qc8 20.Rc1 Qb8 21.Bb4 ab4 22.Qb4 (22.Ng5 Nf6+=) 22...Bb7 (22...Nc5 23.Rc5 Bf3 24.Bf3 bc5 25.Qc5+–) 23.Nd2+– Bd5 24.Bf3 (24.Qg4 g6+–) 24...Bf3+= 25.gf3 Nc5 26.Nc4 Qd8 27.Qc3 (27.Ne5 0–0 28.Qg4 Re8+–) 27...0–0 28.Nb6 The passed pawn on b5 will become decisive later (28.Qe5? Nd3 29.Rd1 Ne5 30.Rd8 Nf3 31.Kg2 Ne1 32.Kf1 Rd8 33.Ke1 Rd5–+) 28...Nd3 (28...Qb6 Decoy theme: b6 29.Qc5) 29.Rd1 Qb6 30.Qd3 (worse 30.Rd3 Qb5 31.Rd1 Qe8=+) 30...h6 31.Qd7 Rb8 32.Rd5 Qg6 33.Kh1 (33.Kf1 Qf6+–) 33...Rb6 34.e4 (34.Re5? Qb1 35.Kg2 Rg6 36.Qg4 f6–+ (36...Rg4?! 37.fg4 f6 38.Rf5–+)) 34...Re6 35.Qd8 Kh7 36.Qh4 Re8 (36...Rb6 37.Qg3 (37.Re5?! Qd6 38.Rg5 Qf6=+) 37...Qf6 38.Kg2+=) 37.Qg4 Qf6 38.Qf5 Qf5 39.ef5 f6 (39...Kg8 40.Kg2+–) 40.b6 Rb8 41.Rb5 (41.Rd6 Rb7+–) 41...Rb7 (41...Kg8 42.f4 ef4 43.Kg2+=) 42.Kg2 Kg8 43.f4 ef4 (43...e4!?+–) 44.Kf3 Kf7 45.Kf4 (45.Ke4 Ke7 46.Kd5 Kd7+–) 45...Ke7 46.Ke4 (better 46.Kg4!?+–) 46...Kd6+= 47.Kd4 (47.Rb2 Kc6+=) 47...Rb8 48.b7 (48.b7 Kc6 49.Rc5 Kb6 50.Kc4=). Barlow – Leyen, email CTON, 1996.

5.e3 Nf6 6.h3 h6 7.c4 Bb1 (better is 7...Nbd7!?+=) 8.Rb1 Nbd7 9.cd5 ed5 10.Be2 Be7 11.Qc2 0–0 12.Nd4 Ne4 (12...g6 13.0–0+/–) 13.0–0 Bb4 14.Nf5 (14.d3 Nef6+/–) 14...Ndf6 (14...g6 15.Nh6 Kh7 16.a3 Kh6 17.ab4 ab4 18.d3+/–) 15.a3 Bd6 (15...Be7 16.d3 Nd6 17.Ne7 Qe7 18.Bf3+/–) 16.d3 Nc5 (16...Ng5 17.e4 de4 18.de4+–) 17.e4+– de4 18.de4 Nce4 (18...Nfe4 19.Bg7 Re8 20.Rbd1+–) 19.Ng7 Nd2 (19...Kg7 20.Qe4 Ba3 21.Qg4 Kh8+–) 20.Nf5 (20.Qd2? Bh2 21.Kh2 Qd2–+) 20...Nb1?? (20...Re8 21.Nh6 Kf8+–) 21.Nh6 Kg7 22.Qf5 Bh2 23.Kh2 Nd2 24.Qg5 Kh7 25.Bd3!! Qd3 26.Nf5 Nf1 27.Kg1 Qf5 28.Qf5 Kg8 29.Qf6 1–0. forsetinn (2355) – decu40 (1950), gameknot.com, 2015.

4.Nf3 f6

5.Nd4 Bd7 6.e4 e5 7.Nf3 Be6 8.ed5 Bd5 9.Nc3 Bf7 10.Bd3 Nd7 11.0–0 a4 12.a3 Nc5 13.Qe2 Nd3 14.cd3 Ne7 15.Rfe1 Nf5 16.Qe4 Nd6 17.Qg4 (17.Qe2!? Be7 18.d4=) 17...h5 18.Qh3 Qd7 19.Qh4 (19.Ne5!? fe5 20.Re5 Kd8 21.Qe3–/+) 19...Be7–+ 20.Rab1 g5 (20...Nb5?! 21.Nb5 Qb5 22.Be5=) 21.Qb4 Nc4! 22.Qc4 (22.dc4 Bb4) 22...Bc4 23.dc4 g4 24.Ne5? (24.Nh4 0–0–0–+) 24...fe5 25.Re5 c6 26.Rbe1 Rh7 27.Ne4 0–0–0 28.d4 Bd6 29.Nf6 Qf7 30.Re6 Rh6 31.d5 cd5 32.cd5 b6 33.g3 Bc5 34.Rc6 Kb7 35.Be5 Rc8 36.Bb2 Rd8 37.Be5 Ba3 38.Ra1 Bd6 39.Bd6 Rd6! 40.Rd6 Rf6 41.Rf6 Qf6 42.Ra4 Qe5 43.Rf4 Qd5 44.f3 gf3 45.Kf2 Qb5 46.Kf3 Qd3 47.Kg2 b5 48.Kh3 Qe2 49.Rf7 Kb6 50.Rf4 Ka5 51.Rf8 Qe4 52.Rf4 Qc2 53.g4 hg4 54.Rg4 b4 55.Kg3 b3 56.h4 b2 57.h5 b1Q 58.Kh4 Qf5 59.Rg2 Qe1 60.Rg3 Qf4 (61.Kh3 Qeg3) 0–1. Shih,Thomas – Feuerstein,Arthur William (2205), Parsippany USA–chT Amateur East, 1998.

5.e3 Nd7 6.Nd4+= Bg6 7.Ne6 Qc8 8.Qf3 (8.c4 dc4 9.Bc4 Nb6+=) 8...c6 9.bc6 (9.Qf4 Kf7 10.Nf8 Kf8+=) 9...bc6 10.Be2 (10.d3 Ne5 11.Be5 Qe6=) 10...Bf7 (10...Bc2!? 11.Na3 Be4=) 11.Nf8+= Nf8 12.0–0 (12.Na3 e5+=) 12...e5 13.Nc3 (13.Na3 e4 14.Qf4 Qb8 15.Qb8 Rb8+–) 13...Ne7 14.e4 (14.Rfb1 Qf5 15.d3 Qf3 16.Bf3 Nfg6+=) 14...d4 (14...Ne6 15.Ba3=) 15.Na4+= Nd7 (15...Rb8 16.Ba3 Qd8 17.Nb2=) 16.c3 c5 17.cd4 (17.Bb5 Nc6+=) 17...ed4 (17...cd4 18.Rfc1 Qb7 19.Ba3+=) 18.Rfc1 (18.Rac1 Qc6 19.Qa3 Rb8 (19...Qe4?? 20.Bf3 Qf4 21.Ba8+–) 20.Nc5 Qd6 21.Nd7 Qd7+–) 18...Qc6 19.Nc5! Nc5 20.Bd4 (20.Qa3 0–0 21.Rc5 Qe6+–) 20...Qe4? (better 20...Ne6 21.Bf6 Qd7=) 21.Bc5 (21.Rc5 Qf3 22.Bf3 Rd8+–) 21...Qf3 22.Bf3 (worse 22.gf3 Bd5+–) 22...Rd8?? (better 22...Rc8+–) 23.Re1 (23.Re1 0–0 24.Be7 (worse 24.Re7 Rd2 25.a3 Rc2+–) 24...Rd2 25.Bf8 Kf8 26.a4+–) 1–0. DEFFM – GuestXJBB, freechess.org, 2018.

5.e3 e5!?=.

3.d4 Nf6

4.e3 c5 5.dc5 Nbd7 6.c4 Nc5 7.Nc3 e6 8.Nf3 Nfe4 9.Ne4 de4 10.Qd8 Kd8 11.Ng5 Ke8 12.Be2 (better 12.Ba3!?=) 12...f6–/+ 13.Nh3 e5 14.Ba3 Be6 (14...Nd3 15.Bd3 ed3 16.Bf8 Rf8 17.Kd2 Bh3 18.gh3–/+) 15.Bc5 Bc5 16.0–0 (16.0–0–0 Rc8–/+) 16...Rd8 17.Rfd1 Ke7 18.a4 g5 19.Kf1 (19.Kh1 g4 20.Ng1 f5–+) 19...g4–+ 20.Ng1 f5 21.g3 Rdf8 Black prepares the advance f4 22.Rd5 (22.Re1–+) 22...Bd5 23.cd5 h5 24.Bc4 (24.Rc1 Kd6 25.Bc4 h4–+) 24...f4 25.ef4 ef4 26.Re1 fg3 (26...e3 27.Ne2 fg3 28.Ng3 Rf2 29.Kg1–+) 27.Re4 Kd7 28.hg3 Rf2 29.Ke1 Rb2 30.Ne2 h4 (30...h4 31.gh4 Rh4–+) 0–1. mgilbert – pcmvr, net–chess.com, 2018.

4.e3 Bg4 5.Be2 Be2 6.Ne2 =.

4.Nf3 Bf5 =.

4.e3 e6

5.a3 c5 6.c4 (6.Nf3 Nbd7=) 6...Nbd7 (6...cd4 7.ed4 dc4 8.Bc4=) 7.Bb2 (7.Nf3 Bd6=) 7...cd4 8.Bd4 Bc5 (8...e5 9.Bc3=) 9.Bb2 (9.cd5!? Bd4 10.Qd4 ed5 11.Nf3+=) 9...0–0=+ 10.Nf3 Re8 11.Nbd2 b6 12.Bd3 e5 13.Be2 Bb7 14.0–0 Qe7 15.Re1 Rac8 16.Qb3 Bd6 17.cd5 Bd5 18.Bc4 Bc4 19.Nc4=+ Qe6 20.Nfd2 Bb8 21.Rac1 Nc5 22.Qc2 Red8 23.Red1 Nd3–/+ 24.Rb1 Ng4 25.Rf1 e4 26.h3–/+ Nge5 27.Be5 Ne5 28.Rbc1 Nd3 29.Rb1 Rc5 30.Qb3 Rg5 31.Kh1 Qg6 32.g4 Qh6 (33.Kg1 Rg4 34.hg4 Qh2#) 0–1. Klein,Sabine – Mittendorf,Frank, Bad Zwesten op 1st, 1997.

5.a3 Bd6 6.Bd3 =+.

5.Ba3 Ba3 6.Na3 0–0 =.

5.Nf3 c5 6.dc5 (6.Ba3 Nbd7=) 6...Bc5 7.a4 (7.Bb2 Nbd7=) 7...0–0 (7...Nbd7 8.Bb2+=) 8.Bb2 b6 9.Be2 Nbd7 10.0–0 Bb7 11.c4 Rc8 12.cd5 Bd5 13.Nbd2 (13.Nc3 Bb7+=) 13...Qe7 14.Rc1 (14.Nc4 Rfd8+=) 14...Ba3 15.Ba3 Qa3 16.Nc4 Qb4 17.Rb1 Qc5 18.Rc1 Rfd8 19.Nfe5 (19.Nce5 Qb4+=) 19...Qc7 20.Nd7 Nd7 (20...Rd7? 21.Nb6 Qc1 22.Qc1 Rc1 23.Rc1+–; 20...Bc4?? 21.Nf6 (21.Rc4?! Qd7 22.Rc6 Qb7+=) 21...gf6 22.Qe1+–) 21.Qd2 Nc5 22.Qa2 Qe7 23.Rfd1 Qg5 24.Bf1 g6 25.h3 Qf6 26.Qc2 Bc4 (26...e5 27.Qc3 Bc4 28.Qc4+=) 27.Qc4 (27.Bc4 Kg7+=) 27...Kg7 28.Rd8 Rd8 29.Qa2 Rd7 30.Be2 (30.Qc2 Qf5 31.Qb2 f6–/+) 30...Ne4–/+ 31.Bf3 (31.Qa1 Qa1 32.Ra1 Rd2–/+) 31...Rd2 32.Rc2 (32.Qc4 Nc5–/+) 32...Rc2 33.Qc2 Qa1 34.Qd1 (34.Kh2 Nc3–/+) 34...Qd1–+ 35.Bd1 Kf6 36.f4 (36.Kf1 Ke5–+) 36...Nc3 (36...Ke7 37.Bb3–+) 37.Bc2 (37.Bb3 Ke7–+) 37...Ke7 38.h4 (38.g4 Kd6 39.g5 Kc5–+) 38...Kd6 39.g4 Kc5 40.h5 Kb4 41.f5? (better is 41.h6 Ka3 42.Kg2–+) 41...gf5 42.h6 (42.Kg2–+) 42...Ne4 43.gf5 (43.g5 Kc3 44.Bd1 Kd3–+) 43...ef5 44.Kg2 Kc3 45.Bb1 Kb3 46.Be4 (46.Kg1–+) 46...fe4 47.Kg3 Ka4 48.Kf4 Kb5 49.Kf5 a4 50.Kf6 a3 51.Kg7 a2 52.Kh7 a1Q 53.Kg8 f5 54.h7 Qg1 (54...Kc4 55.Kf7 Qh8 56.Ke6 f4 57.Kf5 fe3 58.Kg6 e2 59.Kf5 e1Q 60.Kg5 Qg7 61.Kf5 Qh4 62.h8Q Qhg4) 55.Kf8 Qh2 56.Kg8 Kc4 57.h8Q Qh8 58.Kh8 0–1. cachisss (1930) – forsetinn (2365), gameknot.com, 2015.

4.e3 Bf5

5.Ba3 Nbd7=.

5.Ba3 g6 6.h3 Bg7 (6...Nbd7 7.Nf3=+) 7.Bd3 (7.Nc3 c5 8.dc5 Ne4 9.Ne4 Be4=+) 7...Bd3 (7...c6 8.Nc3=) 8.Qd3= Nbd7 9.Nf3 0–0 10.Nbd2 Re8 11.0–0 e6 (11...e5 12.de5 Ne5 13.Ne5 Re5 14.Rad1=) 12.c4 c6 (12...e5 13.de5 Ne5 14.Ne5 Re5 15.Nf3=) 13.c5 (13.bc6!? bc6 14.Bd6+=) 13...e5= 14.Ne5 Ne5 15.de5 Re5 16.Bb2 Re8 17.Nf3 Ne4 18.Bg7 Kg7 19.Rab1 Qf6 20.Qc2 Nc3 (20...Rac8 21.Nd4=) 21.bc6 bc6 (21...bc6 22.Rb7 Nb5+=; 21...Nb1? 22.cb7 Nc3 23.ba8R Ra8 24.Rc1+–) 0–1. sasikumar – mgilbert, net–chess.com, 2019.

5.Bb2 e6=+ 6.Nf3 Bd6 (6...Nbd7 7.Be2=+) 7.Be2 0–0 (7...a4 8.Ba3=) 8.0–0= Nbd7 (8...Ne4 9.c4=) 9.c4 dc4 10.Bc4 Re8 (10...c6 11.bc6 bc6 12.Nc3=) 11.Nc3 Nb6 12.Be2 (12.Bd3 a4=) 12...Nbd5 (12...a4 13.a3=+) 13.a3 (13.Rc1 Nc3 14.Bc3 Ba3=) 13...Qe7 14.Nd5 ed5 15.a4 Rad8 (15...Be4 16.Nd2=) 16.Qb3 Ne4 17.Ba3 Bg4 (17...Ba3 18.Ra3 Qe6 19.Bd3=) 18.Rfe1 Bf3 (18...Ba3 19.Ra3 Bf3 20.Bf3=+) 19.Bd6 Rd6 20.Bf3 Nd2 21.Qd1 Nf3 22.Qf3 Qe4 (22...Qh4 23.Re2=) 23.Qe4 de4 24.Rec1 Rd7 25.Rc2 f5 26.g3 (26.Rac1 Ree7=) 26...Kf7 27.Rac1 Ree7 28.Kf1 Ke6 29.Ke2 Kf6 30.Rc5 g6 31.Kf1 g5 32.Ke2 g4 33.Rh1 h5 34.h3 Rh7 35.h4 Rhe7 36.Rb1 Rd6 37.Rbc1 Rdd7 38.Kd2 Kg6 39.Ke2 (39.Rb1 Re6=) ½–½. Konieczny,A – Obuchowski,A, Bydgoszcz op U18, 2001.

3.e3 c5

4.Bb2 (--> 3.Bb2 c5 4.e3) 4...e6 5.Nf3 Nf6 6.c4 (--> 3.Bb2 c5 4.e3 e6 5.c4 Nf6 6.Nf3).

4.bc6 bc6 5.c4 Nf6 6.Ba3 g6 (6...Ba6 7.d4=) 7.Nc3 Bg7 8.d4 0–0 9.Nf3 Re8 10.Be2 (10.Ne5 Bf5+=) 10...dc4 (10...Ba6 11.Rb1=) 11.Bc4+= Nd5 12.Rc1 Na6 (12...Ba6 13.Qb3 Bc4 14.Qc4+=) 13.0–0 Nc3 14.Rc3 e6 (14...Nc7 15.Bc5+–) 15.Bd3 (15.Qa4!?+–) 15...Nb4+= 16.Bb1 Ba6 17.Re1 Rc8 18.Qc1 Bb5 19.Rb3 (19.Bb2 Rb8+=) 19...Bf8 (19...c5 20.Rc3 cd4 21.Nd4 Rc3 22.Qc3=) 20.Bb2 (20.e4 c5 21.Rc3 cd4 22.Nd4 Ba6=) 20...c5 (20...Nd5!?=+) 21.dc5= Rc5 22.Rc3 Qc7 23.Rc5 Qc5 (23...Bc5? 24.Qc3 e5 25.Rc1+– (25.Ne5?! Bd6 26.Nc4 Bh2 27.Kh1 Kf8 28.Qg7 Ke7+–)) 24.Qc5 Bc5 ½–½. Wilk,Krzysztof (2060) – Kugelmann,Werner (2135), EU–ch Railways USIC, 2000.

4.Nf3 Bg4 5.a4 (5.Bb2 e6=) 5...Nd7 6.Bb2 Ngf6 7.c4 e6 8.cd5 Nd5 (8...ed5 9.Be2=) 9.Be2 N7f6 10.0–0 Be7 11.d4 0–0 12.Nbd2 Rc8 13.dc5 Bc5 14.Rc1 Qe7 15.Qb3 Bb4 16.Bd3 Nd7 17.Bc4 (17.h3!? Bh5 18.Bd4=) 17...Nc5 18.Qa2 Nb6 19.Qa1 (19.Bb3 Nd3 20.Rc2 e5=+) 19...f6 20.Bb3 (20.Qa2 Nca4 (20...Nc4?! 21.Rc4 f5 22.Bc3=) 21.Bd4 Nc5–/+) 20...Bf3 21.Rc5 Bc5 (21...Qc5?! 22.Be6 Kh8 23.Nf3=; 21...Rc5?! 22.Nf3 Nd5 23.Bd4–/+) 22.Nf3 Kh8 23.Nd4 Bd4 24.Bd4 Nd7 25.Bd1 e5 26.Bb2 Qe6 27.Qb1 Nc5 28.h3 Qc4 29.Ba3 Rfd8 30.Bg4 Qa4 31.Bc8 Qa3 (31...Rc8?! 32.Bc5 Rc5 33.Rd1=) 32.Bf5 h6 (32...g6!? 33.Rd1 Rd1 34.Qd1 Kg7=) 33.Bg6 ½–½. Horsak,Antonin – Dvorak,Jan, Svetla nad Sazavou, 1999.

4.g3 Bf5 5.Bg2 e6 (5...Nf6 6.c4+=) 6.Nc3 (6.Nh4 Be4+=) 6...Nf6 7.Nh4 (7.0–0 Bd6+=) 7...Bg6 (7...Bg4!?=) 8.Ng6+– hg6 9.e4 d4 (9...Ne4 10.Ne4 de4 11.Bb2+– (11.Be4? Qd4 12.Bb7 Ra7–+)) 10.e5+– dc3 (10...Nfd7 11.Na4 (worse 11.Bb7 Ra7 12.Bg2 dc3=+) 11...Nb6 12.c3+– (worse 12.Bb7 Ra7 13.Nb6 Rb7=+)) 11.ef6 cd2 (11...Ra7 12.0–0+–) 12.Bd2 1–0. Pierre – Waldorffy, internet, 2020.

4.c4

4.c4 (--> 1.b4 a5 2.b5 c5 3.c4 d5 4.e3).

4.c4 e6 5.Nf3 Nf6 6.Bb2 (--> 1.b4 a5 2.b5 c6 3.Bb2 c5 4.e3 e6 5.c4 Nf6 6.Nf3).

4.bc6 Nc6

5.Bb2 Qb6 6.Ba3 +=.

5.Bb2 Nf6 6.Nf3= Bg4 (6...g6 7.c4=) 7.Bf6 (7.h3!? Bd7 8.c4=) 7...gf6 (7...ef6 8.Nc3+=) 8.h3=. Szkodnikow_i_ofiar – pgcbies, ChessWorld.net, 2015.

5.Bb5 e5 6.Nf3 Bg4 7.h3 Bf3 8.Qf3 =.

5.Bb5 Nf6 6.Bb2 e6 7.Nf3 Bd6 8.Qe2 (8.0–0 0–0=) 8...0–0 9.Bc6 (9.0–0 Qe7=) 9...bc6=+ 10.Ba3 (10.Be5 Rb8=+) 10...Ba3 (10...c5 11.Bb2–/+) 11.Na3=+ Qe7 12.Nb1 Ba6 (12...e5 13.d4 Bg4 14.de5 Bf3 15.Qf3 Qe5 16.c3–/+) 13.d3 Rab8 14.0–0 Rb2 (14...e5 15.Qd2 a4 16.Qc3=) 15.Rc1 (15.Qd2 Qc5 16.Nc3 Qd6=) 15...Rfb8 16.Qd1 e5 17.Nbd2 a4 18.c4 a3 19.cd5 cd5 20.d4 e4 21.Ne5 Bb5 22.h3 Nd7–/+ 23.Nd7 Qd7=+ 24.Nb3 Be2 25.Qe1 Bc4 26.Nc5 Qf5 27.Rab1 Ba2 28.Rb2? ab2 (29.Rb1 Bb1 30.Qb1 Qh5–+; 28...Rb2 29.Na4 Rb8 30.Ra1=+) 0–1. Rush,Bradley – Martini,Marco R, IECG 7PSRR, 1996.

5.Bb5 Nf6 6.Nf3 Bd7 7.c4 dc4 8.Bc4 e5 9.Qb3 Qe7 10.Ng5 0–0–0 11.Nf7 Nd4 12.ed4 ed4 13.Be2 Re8 14.Qc4 Bc6 15.Ba3 Qd7 16.0–0 b5 17.Qc2 Re2 18.Qd3 Qd5 19.f3 Ba3 20.Nh8 Bc5 21.Kh1 Nh5 22.Na3 Nf4 23.Qb3 Qg5 24.g4 Rh2 0–1. Sherven – Chappell, Minnesota 1984.

5.Nf3 Nf6 6.Bb5 Bd7 7.0–0 e6 8.c4 (8.Ba3 Ba3 9.Na3 Qe7=) 8...Be7 (8...dc4 9.Bc4 Rc8 10.d3=) 9.Nc3 dc4 (9...Rc8 10.cd5 ed5 11.Bb2=) 10.Bc4 0–0 (10...Rc8 11.Rb1=) 11.Qe2 (11.Rb1 Rb8=) 11...Ne8 (11...e5 12.Rb1=) 12.a3 (12.d4 Nd6=) 12...Nd6 13.Ba2 (13.d3 Rc8=) 13...a4 (13...b5 14.Nb5 Nb5 15.Qb5=) 14.Rb1 (14.d4 Qc7=) 14...Qa5 (14...e5 15.Bd5 Ra5 16.d4 ed4 17.Nd4=) 15.Nb5 (15.e4 Rfb8=) 15...Rfb8 (15...Qa6 16.Nc3=) 16.d4 (16.Nd6 Bd6 17.Bc4 Ne7=) 16...Nb5 17.Rb5 Qa6 18.Qb2 (18.Re1 Na7 19.Rb1 Qe2 20.Re2 Nb5–/+) 18...b6 (18...Ba3 19.Qb1 Bd6 20.Rb6–/+) 19.Bd2? (better 19.Qb1!?=) 19...Ba3!–/+ 20.Qb1 (20.Qa3 Qb5 Deflection (20...Qb5 Overloading)) 20...Ne7 21.Rh5 (21.Rg5 h6 22.Rh5 Bc6–/+) 21...g6 22.Rh3 Bb5 23.Bb4?? (better 23.Re1 Bd3 24.Qa1=+) 23...Bb4–+ (23...Bf1?! 24.Ba3 Bd3 25.Qa1–+) 24.Qb4 Nc6 (24...Bf1?! 25.Qe7 Rb7 26.Qh4–+) 25.Qd6 Bf1 26.Be6 (26.Qc6 Rc8 27.Qd6 Rc1–+) 26...Bc4 (26...fe6 27.Qe6 Kg7 28.Ng5 h5 29.Rh5 Qc4 30.Rh7 Kf8 31.Qf6 Ke8 32.Qh8 Qg8 33.Qg8) 27.d5 Nd8 (27...fe6 28.Qe6 Kg7 29.Ng5 h5 30.Rh5 Bd5 31.Rh7 Kf8 32.Qf6 Ke8 33.Qh8 Bg8 34.Qg8) 28.Ng5 (28.Bd7 Qa5 29.e4 a3–+) 28...Ne6 (better 28...Qa5 29.g4 Qe1 30.Kg2 Qf1 31.Kg3 Qg1 32.Kf3 fe6–+) 29.de6 (29.Nf7 Qb7 30.de6–+) 29...Rd8 (29...Rd8 30.Qd8 Rd8–+) 0–1. Campos Calvo_Sotelo,J (1950) – Pastor Alonso De Prado,A (2095), 20th Championship de Madrid de Veterano, 2015.

4.d4 cd4

5.ed4 Bf5 =.

5.Qd4 Nf6 6.Nf3 g6 7.Bb2 Bg7 8.Qh4 Qc7 9.c4 Nbd7 10.Nbd2 0–0 11.Rc1 Qd6 12.a3 e5 13.c5 Qb8 14.b6 e4 15.Nd4 Qe5 16.Qg3 Qe7 17.Qc7 Ne8 18.Nc6? (Better is 18.Qg3=+) 18...Qe6–+ 19.Bg7 Kg7 20.Nd8 Nc7 21.bc7 (21.Ne6 Ne6 22.Nb3–+) 21...Qe5 (22.c6 Qc7–+) 0–1. Cuellar,U – Cahuana,Luis, PER–chT Peru, 2000.

3.e3 e5=+

4.c4 c6 (--> 1.b4 c6 2.e3 a5 3.b5 d5 4.c4 e5).

4.d4 ed4 5.ed4 (5.Qd4 Nf6=) 5...Nf6 6.Nf3 Bd6 (6...Ne4 7.Bd3 Bb4 8.Nfd2+=) 7.Bd3+= Qe7 8.Be3 Ng4 9.Qc1 0–0 10.0–0 Ne3 11.Qe3 Nd7 12.Qe7 Be7 13.Nbd2 Nf6 14.a3 Re8 15.c4 g6 16.Rfc1 White prepares the advance c5 16...Be6 17.Nf1 Bd6 (17...dc4 18.Bc4 Bc4 19.Rc4+=) 18.c5 Bf4 19.Re1 Bg4 20.N3d2 Re1 (20...Kg7 21.g3 Bh6 22.Kg2=) 21.Re1= Be6 22.a4 Bh6 23.Ne3 Re8 24.g3 Be3 (24...Kf8 25.Kg2=) 25.Re3 Kf8 ½–½. yzerman123 (2230) – forsetinn (2405), gameknot.com, 2015.

4.d4 Nd7 5.de5 Ne5 6.Bb2 Bb4 7.Nd2 =.

4.Bb2 Bd6

5.c4 c6 6.Qc2 cb5 (6...dc4 7.Bc4 cb5 8.Bb5 Bd7 9.Qd3=) 7.c5 Bc7 8.Bb5 Bd7 9.Qa4 Nc6 10.Nf3 Qf6 11.Nc3 Nge7 12.Ne2 (12.e4 de4 13.Ne4 Qg6=) 12...0–0= 13.Qb3 (13.0–0 Rac8=) 13...Be6 (13...Bh3 14.Ne5 Be5 15.d4 Bg2 16.Rg1+=) 14.Nf4= Qh6 15.Ne6 fe6 16.Bc6 bc6 17.Qb7 Rac8 18.Ne5 Qf6 19.0–0 Be5 20.Be5 Qe5 21.Qe7 Rf7 22.Qh4 Rb7 23.Qg4 Rcb8 24.d4 Qf5 25.Qe2 (25.Qg3 Rd8+/–) 25...e5 26.Qa6 ed4 27.ed4 Qf6 28.Rad1 (28.Qa5?! Qd4 29.a4 Qa1 30.Ra1 Rb1 31.Qe1 Re1 32.Re1 Ra8+=) 28...Rb2 29.Qa5 R8b5 30.Qa8 (30.Qc7!? Rb8+/–) 30...Rb8+/– 31.Qa3 Re2 32.Qa6 Rbb2 33.Qc8 Kf7 34.Qc7 Re7 35.Qd8 Ra2 36.h3 Ra4 37.Qc8 Re4 38.Qd7 Re7 39.Qc8 Qe6 40.Qb8+/– Qd7 41.Rd3 Re8 42.Qb3 Rea8 43.Qd1 Kg8 44.Qh5 g6 45.Qh4 Re8 46.Rb1 Qe7 47.Qh6 Rf8 48.Rbd1 Qe2 49.Qe3 Re8 50.Qe2 Re2 51.Re3 Re3 52.fe3 Ra2 53.Rf1 Kg7 54.Kh2 Re2 55.Rf3 h5 56.Kg1 Ra2 57.Kf1 g5 58.Rf2 Ra1 59.Ke2 Kg6 60.Rf8 Ra2 61.Kf3 g4 62.hg4+– hg4 63.Kg4 Rg2 64.Kf3 Ra2 65.Rc8 Ra6 66.Kf4 Kf6 67.Rd8 Ke7 68.Rd6 Ra1 69.Rc6 Rh1 70.Rd6 Rh4 71.Kg3 Rh5 72.Kg4 (72.Kg4 Rh1 73.Rd5 Rg1 74.Kf5 Rf1 75.Ke4+–) 1–0. Nemeth,Laszlo1 (1965) – Szlabey,Geza (2005), HUN–chT2 Erkel, 2009.

5.d4 Nd7 =.

5.Nf3 Nd7 6.d4 Qe7 7.c4 (7.de5 Ne5 8.Qd5 Nf6=) 7...ed4 (7...dc4!? 8.Nfd2 Nh6=) 8.Qd4 (8.Bd4 Ngf6 9.cd5 Nb6 10.Bb6 cb6+=) 8...Ngf6+= 9.cd5 0–0 (9...Nb6 10.Bc4+=) 10.Nc3 (10.Bd3 Re8+=) 10...Bc5 (10...Ne5 11.Be2+=) 11.Qd2 (11.Qh4 Nb6+–) 11...Re8 (11...Rd8 12.Bd3+=) 12.Be2 (12.Bd3 a4 13.a3 Bd6+–) 12...Nb6 13.0–0 Bf5 14.Nd4 (14.Rfe1 Red8+=) 14...Bg6 (14...Bd4 15.Qd4 Qb4 16.Nd1=) 15.Rac1 (15.Rfd1 a4+=) 15...Rad8 d5 seems the pivot of the position (15...Nbd5? 16.Nd5 Nd5 17.Nf5 Bf5 18.Qd5 Be3 19.fe3+–) 16.Bf3 (16.Rfd1 Nbd5 17.Nd5 Nd5=) 16...Bd6 (16...Nc4 17.Qe2 Nb2 18.Qb2=+) 17.Nce2 (17.Rcd1 a4=) 17...h5 (17...Nbd5!? 18.Rfd1 Ne4 19.Be4 Qe4=+) 18.Ng3 (better 18.Qa5 Ra8 19.Qd2+=) 18...h4? (better 18...Bg3!? 19.hg3 Ne4 20.Be4 Be4 21.Qa5 Bd5+=) 19.Ngf5 (better 19.Ndf5 Qd7 20.Bf6 (worse 20.Nd6 Qd6 21.Bf6 Qf6+–) 20...gf6 21.Nd6 Qd6 22.Ne2+–) 19...Bf5? (better 19...Qe5 20.Nd6 Qd6+–) 20.Nf5+– Qf8 (20...Qd7 21.Bf6 Qf5 22.Bd8+–) 21.Nd6 (21.Bf6 gf6 22.Qd4 Be5 23.Qg4 Kh8 24.Qh4 Kg8+–) 21...Qd6 22.Bf6 Qf6 23.Rc7 (worse 23.Qa5 Nd5 24.Rfd1 c6+–) 23...h3 (23...Rd7 24.Rd7 Nd7 25.Qa5+–) 24.Rb7 (24.Rd1 hg2 25.Bg2 Qg6+–) 24...Nc4 (24...hg2 25.Bg2 (25.Kg2 Re5 26.h4 Nd5 27.Qa5 Qh4–/+) 25...a4 26.Rd1+–) 25.Qd4 (25.Qe2 Nd6 26.Ra7 Ne4+–) 25...Ne5? (better 25...Qd4 26.ed4 Nd2+–) 26.Qf4?? (better 26.Be4+–) 26...Qf4+– 27.ef4 Nf3 28.gf3 Rd5 29.Kh1 (better 29.b6!?+=) 29...Rd2=+ 30.Kg1 Ree2 (30...Ra2!? 31.b6 Rb2=+) 31.b6+= Rb2 32.Rb8 (32.a4 Re6 33.Rb8 Kh7=+) 32...Kh7= 33.a4 Red2 34.b7 (34.Ra8 Rb6 35.Ra5 Rb4=) 34...Rd6 (34...Kg6 35.Ra8 Rb7 36.Ra5=) 35.f5+= Rf6 (better 35...Rd7 36.Ra8 Rdb7 37.Ra5 R7b6+=) 36.f4 (better 36.Ra8 Rb7 37.Ra5+–) 36...Rf5=+ 37.f3? (37.Rd1 Rf4 38.Ra8 Rb7 39.Ra5 g6–/+) 37...Rf4 (better 37...Rd5 38.Rb1 Rb1 39.Kf2 Kg6–+) 38.Rf2 (38.Ra8 Rb7 39.Ra5 Rb2=+) 38...Rb1 (38...Rb6 39.Ra8 Rb7 40.Ra5–/+) 39.Rf1=+ Rbb4 (39...Rb3 40.Ra8 Rb7 41.Ra5=+) 40.Rf2 (40.Kf2 Rb3 41.Kg3 Ra4 42.Kh3 Rab4=+) 40...Rf6 (40...Rb6 41.Ra8 Rb7 42.Ra5=+) 41.Kf1 (41.Rf1=+) 41...Rg6 (better 41...Rb1 42.Ke2 Rfb6–/+) 42.Rd2 Rc6 (42...Rgb6 43.Kf2=) 43.Ke2 (43.Kf2 Rc7+=) 43...Re6 (43...Rc7 44.Ra8 Rcb7 45.Ra5+=) 44.Kf2+= Rb2?? (better 44...Re7+=) 45.Rh8!! Kh8 46.Rb2 Kh7 (46...Re8 47.Rc2 Kh7 48.Rc8 Rc8 49.bc8Q+–) 47.b8Q Re2 48.Re2 Kh6 (48...Kh6 49.Qh8 Kg6 50.Re5 f5 51.Re6 Kg5 52.Qg7 Kf4 53.Qg3; 48...g6 49.Qf8 g5 50.Qf7 Kh6 51.Re6) 0–1. FeegLood (2815) – MeneerMandje (2645), lichess.org, 2017.

5.Nf3 Qe7 6.c4= c6 7.Nc3 (7.c5 Bc5 8.Ne5 Nf6=) 7...Nf6 8.Na4 Nbd7 9.Qb3 (9.c5 Bb8=) 9...0–0=+ 10.Rc1 (10.c5 Nc5 11.Nc5 e4 12.bc6 Bc5=+ (< 12...ef3 13.Nb7 a4 14.Qd1+/–; 12...bc6?! 13.Nd4 Bc5 14.Nc6=+)) 10...d4 11.c5 ( 11.Be2=+) 11...Bc7 ( 11...Nc5!? 12.Nc5 Bc5–/+) 12.Bc4 (12.b6 Bb8 13.ed4=) 12...Nb8 ( 12...Ne4 13.Ba3 Rb8=+) 13.b6+/– Bd8 14.0–0 Bg4 (14...Nbd7 15.ed4 e4 16.Rfe1+–) 15.ed4 e4 16.Ne5 Be6 (16...Nbd7 17.d3 Be6 18.Rfe1+–) 17.Rce1 Nbd7 (17...Bd5 18.d3 Nbd7 19.de4 Ne4 20.Bd5 cd5 21.Qd5+–) 18.Nc3 (18.Be6 fe6 19.Nc3 Ne5 20.de5 Nd5+–) 18...Bf5 (18...a4 19.Na4 Re8 20.d3+–) 19.Nd7 ( 19.d3!? Ne5 20.de5+–) 19...Qd7+/– 20.d5 a4 21.dc6 Qc6 22.Qb5 (22.Qb4 Nd7 23.f3 Nc5 24.fe4+/–) 22...Bd7 (22...Qb5!? 23.Bb5 a3+/–) 23.Qc6 Bc6 (23...bc6?? 24.Ne4 Ne4 25.Re4+–) 24.Ba3 Re8 25.d4 ed3 26.Re8 Ne8 27.Bd3 (27.Rd1 Bf6 28.Nd5 Rd8 29.Rd3 Rd7+–) 27...Bf6 28.Bb4 g6 (28...Rd8 29.Rd1+/–) 29.Nb5 (29.Re1 h6+–) 29...Be5 (29...Rd8 30.Bc4+/–) 30.f4 (30.Re1 f6+–) 30...Bb5 31.Bb5 Bd4 32.Kh1 Nf6 33.Rd1 (33.c6 Bb6 34.cb7 Rb8+–) 33...Be3 34.g3 Rc8 (34...h6 35.Kg2 Rc8 36.Kf3 Rc5 37.Bc5 (37.Ke3 Rb5 38.Rd8 Kh7=+) 37...Bc5 38.Rd8 Kg7 39.Ba4+–) 35.c6 Bb6 (35...bc6 36.b7 Rb8 37.Bc6+–) 36.cb7 (36.Ba4 bc6 37.Bb3 c5=) 36...Rb8 37.Bc6 (37.Rd6 Be3 38.Bc6 Ng4+–) 37...Bc7 38.Kg2 Kg7 39.Bc3 h5 (39...a3+–) 40.Rd7 Bd8 41.Be5 Kf8 42.Rd8! Rd8 43.Bf6 Rd2 (43...Rb8 44.Be5 Rb7 45.Bb7+–) 44.Kh3 (44...Rb2 45.Bb2 Ke7 46.b8Q f6 47.Qc7 Kf8 48.Qh7 h4 49.Ba3#) 1–0. Amor Alcaide,Manuel (2115) – Castillo Garcia,Elias (2000), La Lira op Barcelona, 1995.

5.Nf3 Qe7 6.c4 Nf6 7.d4 Bb4 8.Nbd2 e4 =.

5.Nf3 Qe7 6.c4= Nf6 7.cd5 Nd5 8.e4 =.

5.Nf3 Qe7 6.c4 Nf6 7.Be2 b6 (7...e4!? 8.Nd4 0–0+=) 8.Nc3 Bb7 9.a4 (9.d4 e4 10.Nd2 0–0+=) 9...Nbd7 10.cd5 Nd5 11.Nd5 Bd5 12.0–0 0–0 13.Qc2 Rac8 14.Rac1 f5 15.Bc4 Qe6?? (better is 15...Bc4 16.Qc4 Kh8=) 16.Ng5+– Qe7 (16...Bc4 17.Ne6 Be6+–) 17.Bd5 Kh8 18.f4 h6 19.Ne6 Rf6 20.fe5 Be5 21.Be5 Ne5 22.Nf4 g5 (22...c5 23.bc6 Nc6 24.Ng6 Rg6 25.Qf5+– (25.Bc6?! Rgc6 26.Qc6 Rc6 27.Rc6 Qd7 28.Rb6 Qd2=)) 23.Nh5 (23.Nh5 Rd6 24.Qf5+–) 1–0. Zak,Pawel (1815) – Jankowski,Aleksander, Polanica Zdroj op–C, 2007.

5.Nf3 f6 6.c4 c6 7.Nc3 Ne7 8.d4 e4 9.Nd2 Bb4 10.cd5 Bc3 11.Bc3 cd5 12.a4 Be6 13.Nb3 b6 14.Be2 Nd7 15.Bh5 g6 16.Be2 f5 17.g3 (17.Rc1!?+=) 17...Nf6 18.Rc1 h5 19.h4 Ng4 20.Qd2 Kf7 21.Rc2 Rc8 22.f3 (better is 22.0–0+=) 22...ef3–/+ 23.Bf3 Qd6 24.Rg1 Qa3 25.Nc1 Qa4 26.Be2 Qa3 27.Bg4 fg4 28.Nd3 Bf5 29.Ne5 Kg7 30.Rc1 Be4 31.Rf1 Nf5 32.Rf4 Rhe8 33.Re4 (33.Kf2–+) 33...de4 34.Nd7 (34.Kf2 Qd6–+) 34...Qd6 35.d5 (35.Ne5 Rf8 36.d5–+) 35...Kf7 36.Ne5 (36.Nb6 Qb6 37.Kf2 Qb5–+) 36...Re5 37.Be5 Rc1 (37...Qe5?! 38.Rc8 Qg3 39.Qf2 Qe3 40.Qe3 Ne3 41.Rc7 Ke8 42.Rc6 Nd5 43.Rd6–+) 38.Qc1 Qe5 39.Qc6 Qg3 40.Kd1 Qd6 41.Qb7 Ne7 0–1. Fabus,Marian (1815) – Bucek,Eduard (2045), SVK–chT2C, 2006.

5.Nf3 Bg4 6.Be2 Qe7 7.0–0 Nf6 8.h3 Bf5 9.c4 0–0 10.Nc3 dc4 11.Bc4 Qd7 (11...Nbd7 12.Nd5 Nd5 13.Bd5=+) 12.d4 e4 13.Ne5 (13.Nd2 Be6=) 13...Qe7 (13...Qe8 14.f4=) 14.Nd5 Nd5 15.Bd5 Be5 16.de5 (< 16.Bb7 Ra7 17.Be4 Be4 18.de5 Qg5–+) 16...c6 17.bc6 Nc6 18.Qc2 (18.Qh5 Bg6 19.Qg4 Ne5 20.Be5 Qe5 21.Bb7 Rad8=) 18...Ne5 (18...Nb4 19.Qb3=+) 19.Be4 Be4 (19...Rac8 20.Qb1 Be4 21.Qe4=) 20.Qe4+= Nc6 21.Qe7 Ne7 22.Ba3 Rfe8 23.Be7 (23.Rfb1!?+/–) 23...Re7+= 24.Rab1 Rb8 (24...Rd7 25.Rfd1 Rd1 26.Rd1=) 25.Rb6 Re6 (25...Rc7 26.Rfb1+=) 26.Rfb1 Rb6 27.Rb6 a4 28.Kf1 g5 29.Ke2 Rc8 30.Kd2 Rd8 31.Kc2 Rc8 32.Kb2 Rd8 33.Ka3 Rd3 34.Ka4 Rd2 35.Ka3 Rf2= 36.Rb2 Rb2=+ 37.Kb2 Kf8 38.Kc3 Ke7 39.Kc4 Kd6 40.Kb5 Kc7 41.Kc5 h5 42.Kd5 Kd7 43.Ke5 Ke7 44.Kf5 f6 45.e4 b5 46.e5 fe5 47.Ke5 g4 48.h4 b4 49.Kf5 (49...Kf7 50.Kg5+–) 1–0. Flaherty,K – Van der Kooij,W, corr, 1988. (even known as Flaherty,H – Hakulin,K, corr, 1988)

5.Nf3 Bg4 6.Be2 Bf3 7.Bf3 Nf6 8.g3 (8.Nc3 e4 9.Nd5 Nd5 10.Be4 c6=) 8...Nbd7 9.0–0 0–0 10.Bg2 a4 11.Ba3 Ba3 12.Na3 Qe7 13.Qc1 e4 14.f4 ef3 15.Bf3 Ne5 16.Bg2 Ne4 17.Nb1 c6 18.bc6 bc6 19.d3 Nd6 20.Nc3 Ng4 21.e4 (21.Nd1 Rfe8+=) 21...Qe5 22.Qd2 d4 (22...Qd4 23.Kh1 Ne3 24.Qf2–/+) 23.Ne2 Ne3 24.Rfb1 Ng2 25.Kg2 f5 26.Qf4 Qf4 27.Nf4 Nb5 (27...fe4 28.Ne6 Rf6 29.Nd4+=) 28.Rb4 (28.Ne6!? Rf6 29.ef5 Rf5 30.Rb4=) 28...fe4+= 29.de4 Rfe8 30.Re1 Re5 31.Nd3 Re7 32.Rc4 Rc7 33.Ne5 c5+= 34.Nd3 Na3 35.Rc5 Rc5 36.Nc5 Nc2 37.Rc1 Na3 38.Rd1 Nc2 39.Rd2+= Ne3 40.Kf3 Rf8 41.Ke2 a3 42.Rd4 Ng4 43.Nd3 Rc8 44.Nb4 Ne5 45.Kd1 Kf7 46.Nc2 Rc3 47.Ra4 Nc4 48.Ra6 Ne3 49.Ne3+/– Re3 50.Kd2 Re4 51.Ra3 Rb4 52.h4 Rb1 53.Rf3 Ke7 54.Kc2 Rb4 55.Kc3 Rb1 56.a4 Ke6 57.Kc4 Ra1 58.Kb4 h6 59.Rb3 Kd5 60.Kb5 Kd6 61.a5 Kc7 62.Ka6 Ra4? 63.Rb7 Kc8 64.Rg7 Ra3 65.g4 Ra4 66.h5 Rb4 67.g5 (67.g5 hg5 68.h6+–) 1–0. Toth,Tamas (2010) – Tanacs,Anna (2025), HUN–chT2 Maroczy, 2008.

5.f4 Qe7 6.Nf3 f6 7.Nc3 Be6 8.f5 (8.Be2 ef4 9.Nd4 Nh6 10.Bh5 g6+=) 8...Bf7= 9.Be2 (9.Qe2!?=) 9...Nh6+= 10.0–0 c5 (10...0–0 11.Nh4+=) 11.e4 (11.Nh4 0–0=) 11...d4= 12.Na4 Nd7 13.b6 (better is 13.Qe1!?=) 13...c4+= 14.Ne1 Qd8 15.c3 (15.Rb1!?–/+) 15...d3–+ 16.Bh5 g6 17.fg6 (better is 17.Bf3!?–+) 17...hg6 18.Bf3 Qe7 (18...Nb6 19.Bc1–+) 19.Qb1 (19.Rb1!?–/+) 19...Be6–+ 20.a3 (better is 20.Kh1–+) 20...Qh7 21.h3 Nf7 22.Nd3 (22.Rf2–+) 22...cd3 23.Qd3 (23.c4 Nb6! 24.c5 Na4 25.cd6 Nd6 26.Qd3 Qc7–+) 23...Nc5 24.Qc2 (24.Qb5 Bd7 25.Qc5 Bc5 (25...Ba4?! 26.Qc4 Bd7 27.d4–+) 26.Nc5 Ng5–+) 24...Bb3 25.Qc1 (25.Qb1 Na4 26.Be2 Ng5 27.Bb5 Ke7–+) 25...Ba4 26.Qb1 (26.d4 Nb3 27.Qc2 Ng5–+) 26...Nb3 (26...Ng5 27.d4 Nh3 28.gh3 Qh3 29.Rf2 Qg3 30.Rg2 Qf3 31.Qf1–+) 27.Qc2 (27.Bd1 Ng5 28.Bb3 Bb3–+) 27...Rc8 (better is 27...Ng5 28.d4 Nf3 29.Rf3 Qd7–+) 28.Rab1 (28.Rae1 Bc5 29.Re3 Be3 30.de3 Rc6–+) 28...Bc5 (better is 28...Nc5 29.Qa4 Na4 30.Ba1–+) 29.d4 (29.Kh2 Bd7 30.d4 Bh3–+) 29...Bd4! 30.Kh2 (30.cd4 Rc2 Pinning (30...Rc2 Deflection; 30...Rc2 Clearance)) 30...Ng5 (30...Bd7 31.Qd1 Bh3 32.Bh5–+) 31.Bg4 Rc6 32.Rbc1 (32.Rf6 Bg1! 33.Kg1 Rf6–+) 32...Bb6 33.Rfd1 Nc5 34.Qd2 Bd1 35.Rd1 Nge4 (better is 35...Qh4 36.Bd7 Ke7 37.Bc1–+) 36.Qc2 Qh4 37.c4 Qg4 38.Rd5 Qg3 39.Kg1 Rh3 0–1. ultraman_24 (1610) – heaterhog (1980), gameknot.com, 2015.

4.Bb2 Nd7

5.c4 dc4 6.Bc4 e4 7.d4 (7.Qb3 Nh6=) 7...Nb6+= 8.Be2 Qg5 9.g4 Nf6 10.h4 Qg6 11.g5 Nfd5 12.a3 h6 13.Bh5 Qf5 14.Nd2 (14.gh6!? Rh6 15.Be2–/+) 14...hg5–+ 15.hg5 g6 16.Bg4?? (better is 16.Bf3 Rh1 17.Bh1 Qg5 18.Ne2–+) 16...Rh1 17.Bf5 Rg1 18.Nf1 Bf5 19.Qc2 Bd6 20.0–0–0 Rg5 21.Kb1 (21.Nd2 Rg2 22.Rf1 Rh2–+) 21...Kd7 22.Nd2 Rg2 23.Nc4 Nc4 24.Qc4 Be6 25.Qc1 (25.Qf1 Rh2–+) 25...Rh8 26.Rf1 Rhh2 27.Bc3 Nc3 28.Qc3 Rf2 29.Rf2 Rf2 30.Qa5 Re2 31.b6 Re3 32.bc7 (32.d5 Bf5 33.Qb5 c6 34.dc6 bc6–+) 32…Ra3 (32...Ra3 33.Qb5 Kc7–+) 0–1. Williams,Barry M – Goffin,Peter B, NZCCA HT corr New Zealand, 1998.

5.c4 Ngf6 6.Nc3 d4+= 7.ed4 (7.Na4 de3 8.fe3 e4+=) 7...ed4 8.Nd5 (8.Na4 Nc5 9.Qe2 Be6 10.Nc5 Bc5–/+) 8...Nc5–/+ 9.Qe2 Be6 10.Nf4 (10.Nf6 Qf6 11.Nf3 0–0–0–/+) 10...Be7 (10...Bd6 11.Ne6 Ne6–/+ (11...fe6?! 12.Bd4 0–0 13.Nf3=)) 11.Ne6+= Ne6 12.Qf3 0–0 (12...Qd6 13.Qb7 0–0 14.Qf3+=) 13.Qb7 (13.Bd3!?+=) 13...a4–/+ 14.Bd3 (14.Qf3 a3 15.Bc1 Re8–/+) 14...Nc5 15.Qf3 Ng4 16.Bf5 (16.Bb1!? a3 17.Ba3–+) 16...Ne5–+ 17.Qh3 g6 18.Ne2 gf5 19.Bd4 Ncd3 20.Kf1 f4 21.Be5 (21.Qf5 Re8–+) 21...Ne5 22.Qc3 Nd3 23.Nd4 Bf6 24.Qd3 Bd4 25.Rd1 Qf6 26.Qf3 Rae8 27.Rg1 Qe6 28.d3 Kh8 29.g4 Rg8 (29...fg3 30.Rg3 f5 31.h3–+) 30.h4 (30.h3 Qf6–+) 30...Bb6 (30...Qh6 31.Qd5 Bc3 32.h5–+) 31.Rg2 (31.Rc1 Qf6 32.g5 Qb2–+) 31...Qe5 32.Rb1 (32.g5 f6–+) 32...Qc3 33.Rd1 (33.g5 Bc5–+) 33...Qc2 34.g5 (34.Kg1 a3 35.g5 Qa2–+) 34...a3 35.Ra1 (35.Rg4 Bf2! 36.Rf4–+) 35...Qb2 36.Rd1 Qa2 37.Rg4 Qb2 38.Rf4 a2 39.Rf7 (39.d4 a1Q 40.Ra1 Qa1 41.Kg2 Bd4–+) 39...a1Q 40.Ra1 Qa1 41.Kg2 Qa8 0–1. cachisss (1925) – calabuig (2055), gameknot.com, 2015.

5.c4 Ngf6 6.Nf3 e4 7.Nd4 Nc5 8.h3 Ne6 9.Ne6 Be6 10.Qc2 Be7 11.cd5 Bd5 12.Nc3 c6 13.Rc1 0–0 14.Be2 (14.Nd5 cd5 15.Qc7 Rb8=) 14...Rc8 15.0–0 Re8 (15...cb5 16.Bb5 Ba2 17.Qa4+=) 16.Qa4 b6 17.Nd5 Qd5 (better is 17...cd5!? 18.d3 Rc1 19.Rc1 Bc5+=) 18.bc6+/– Qd2 19.Rc2 Qb4 20.Qb4 Bb4 21.Ba6 Rc7 22.Rd1 Bc5 23.Bb5 Kf8 24.Rcd2 Ke7 25.Be5 Rcc8 (better is 25...Ra7+–) 26.c7 Bb4 27.Rc2 (27.Be8 Bd2 28.Bb5 Bb4+–) 27...Bc5 (27...Rg8 28.Bf6 Kf6 29.Rc6 Ke7 30.Ba6+–) 28.Be8 Ne8 (28...Ke8 29.Rc4 Nd7 30.Bg7 Rc7 31.Re4 Be7+–) 29.Rcd2 f6 (29...Ra8 30.Rd7 Ke6 31.Rd8 Nc7 32.Bc7 Rd8 33.Rd8+–) 30.Bg3 (better is 30.Rd8 Nc7 31.Rc8 Ne6+–) 30...Ke6 31.Rd8 Rc7 32.Re8 (32.Re8 Re7 33.Re7 Ke7 34.Bc7+–) 1–0. Trindade,J Steffens Da (1775) – Bueno,M A Ferr (1760), Foz do Iguacu BRA, 3rd Open, 2013.

5.d4 e4+= 6.Nc3 (6.c4 dc4 7.Bc4 Nb6–/+) 6...Nb6–/+ 7.a4 (7.Nge2 Nc4 8.Qb1 Nf6–/+) 7...Bb4 8.f3? (better is 8.Nh3!?–/+) 8...Nh6–+ 9.Nge2? (9.Qd2 0–0–+) 9...Nf5 (better is 9...Nc4 10.Qc1 Nf5 11.Ng3 Nb2 12.Qb2–+) 10.fe4 (10.Nf4 Ne3 11.Qc1–+) 10...Qh4 (10...Ne3?! 11.Qd3 Qh4 12.g3 Qe4 13.Kf2 Ng4 14.Kg1 Qh1 15.Kh1 Nf2 16.Kg1 Nd3 17.cd3–+) 11.g3 (11.Ng3 Ng3 12.hg3 Qh1 13.Qf3–+) 11...Ng3 (better is 11...Qe4! 12.Rg1 Ne3–+) 12.Ng3+– Bg4 13.Be2 Nc4 14.Qc1 (14.Bg4?! Nb2 15.Qd2 Qg4=) 14...Be2 15.Ba3?? (better is 15.Ke2 Bc3 16.Bc3+–) 15...Bc3–+ (15...Na3?! 16.Ke2 Bc3 17.Ra3–/+; 15...Ba3?! 16.Ra3 Bf3 17.0–0 Be4 18.Nce4 Na3 19.Qa3 de4 20.Rf4+=) 16.Ke2 de4 17.Qf1 Qg4 18.Kf2 Qf3 19.Kg1 0–1. Haroldlee123 – pgcbies, ChessWorld.net, 2015.

5.Nf3 Bd6 6.c4 =+.

5.Nf3 e4 6.Nd4 Ngf6 7.c4 a4 8.a3 (8.Nc3 Nb6 9.Nd5 Nbd5 10.cd5 Qd5+= (worse is 10...Nd5 11.Qc2+=)) 8...dc4 9.Bc4 Bd6 (9...Bc5 10.Qc2+=) 10.Nc3= 0–0 (10...Nc5 11.d3 Bg4 12.Qc2 ed3 13.Bd3 Nd3 14.Qd3=) 11.Na4 (11.0–0 Nc5 12.f3 ef3 13.Nf3 Be6 14.Be6 fe6=) 11...Ne5 12.Be2 Nfd7 (12...Nd5 13.0–0=) 13.0–0 (13.Nf5 Qg5 14.Ng3 Nd3 15.Bd3 ed3=) 13...Qh4 14.g3 (14.h3 Nf6 15.Re1 Bg4–/+) 14...Qh3 15.f4 (15.Nc3 Nc5 16.f4 ef3 17.Bf3 Nf3 18.Qf3 Bg4=) 15...ef3 16.Bf3 (worse is 16.Nf3 Ng4–+) 16...Nf3 17.Nf3 (17.Rf3 Ne5 18.Rf2 h5+=) 17...Qh5 18.Qb3 (18.Nc3 Re8=) 18...Qg4 19.Bd4 (19.Nd4 h5 20.Nc3 Nc5+=) 19...c5+= 20.bc6 bc6 21.Nh4 (21.e4 c5 22.Be3 Qe4+=) 21...Ra5 22.Rf2 (22.Qc2 c5 23.Nf5 Bg3 24.Ng3 cd4+=) 22...Rh5 23.Raf1 Bg3 24.hg3 Rh4 25.Qd1 (25.Rg2 Rh5+=) 25...Ba6 (25...Qg5 26.Rg2 Rh3 27.Rf4+=) 26.Qg4 Rg4 27.Rc1 Rg3 28.Kh2 (28.Rg2 Rg2 29.Kg2 Bb5+=) 28...Rg6 29.Nc5 Nc5 30.Rc5 Bb5 (30...Rb8 31.Rg2+=) 31.Re5 f6 32.Re7 Ra8 33.Bc5 Bd3 34.Bb4 (34.Rg2 Rg2 35.Kg2 Ra5+=) 34...Rc8 (34...Rg5 35.Rg2+=) 35.Rd7 (35.Rg2 Rg2 36.Kg2 c5+=) 35...Bc2 36.d4 Rh6 37.Kg3 Bd3 38.Rd2 Be4 39.Re7 Rg6 40.Kh3 (40.Kh2 f5+=) 40...f5 41.a4 Ra8 42.a5 Rg1 43.Ra2 g5 (43...h5 44.Bd6–/+) 44.Bd6+= Rh1 (44...Re1 45.a6+=) 45.Kg3 h5 46.Kf2 h4 47.Rb2 Rb1 48.Rb1 Bb1 49.Rb7 Be4 50.Rb8 (50.Be5 Ra5 51.Rg7 Kf8 52.Rg5 Kf7=) 50...Rb8–/+ 51.Bb8 Bd3 52.Bc7? (52.Ke1 g4 53.Kd2 Bf1–/+) 52...Kf7 53.Kf3 Kg7 (53...Kg6 54.e4 fe4 55.Ke3–+) 54.Bd6 Kh6 55.Bh2? (55.Bb4!?–/+) 55...Kg6–+ 56.Bg1 (56.Kf2 g4 57.Be5 g3 58.Kf3 Kg5 59.Bf4 Kh5 60.Bg3 hg3 61.Kg3 Kg5–+) 56...Be4 57.Kf2 g4 58.Bh2 g3 59.Bg3 hg3 60.Kg3 Bd3 61.Kf2?? (better is 61.Kf4–+) 61...Kf6 62.Kf3 Ke6 63.Kf4 Kd5 64.Kf3 c5 65.dc5 Be4 66.Kf4 (66.Ke2 Kc5 67.Kd2 Bd5–+) 66...Kc5 67.Ke5 Kb5 (67...Kb5 68.Kd4 Ka6–+) 0–1. housemd (2040) – bla_ner (2040), gameknot.com, 2015.

5.Nf3 f6 6.c4 c6 7.a4 Nh6 8.Qb3 Nc5 9.Qc2 Bf5 10.d3 e4 11.de4 Be4 12.Qd1 Be7 13.Nbd2 0–0 14.Ne4 Ne4 15.Nd4 Bb4 16.Ke2 Qe8 17.f3 Qh5 18.g4 Ng3 19.hg3 Qh1 20.cd5 cd5 21.Qb3 Qh2 22.Kd3 Qd2 0–1. elsh1403 (1620) – slimak23 (1615), kurnik, 2012.

3.e3 Nf6

4.a4 e5 5.Bb2 Bd6 6.Nf3 =+.

4.a4 Bf5 5.Ba3 Nbd7 6.Nf3 e6 (6...e5 7.Bf8 Rf8 8.d4=+) 7.c4 (7.Bf8 Nf8 8.Be2 Ng6=) 7...Ba3=+ 8.Ra3 (8.Na3 0–0=) 8...0–0 9.h3 (9.d4 Qe7 10.Ra1 Be4=+) 9...Qe7 10.Ra2 (10.Ra1 Nb6–/+) 10...Rad8 (10...Qb4 11.Na3–/+) 11.Nc3 Nc5 (11...Nb6 12.cd5 Nfd5 13.Nd5 Nd5 14.Qb3–/+) 12.d4=+ dc4 13.Bc4 Nce4 14.Qb3 Nd7 (14...Nc3 15.Qc3 Ne4 16.Qa3= (16.Qa5?? Ra8 17.Qd2 Nd2 18.Nd2 Qb4–+)) 15.0–0 Nd6 16.Be2 Ne4 (16...Rfe8 17.Rd2=) 17.Ne4 Be4 18.Qc3 b6 (18...Nb6!?+=) 19.Qc7+/– Rc8 20.Qf4 Bd5 21.Raa1 Rc2 22.Bd3 Rc3 23.Bb1 Rfc8 24.e4 Bc4 25.Rc1 Ra3? 26.Ra2+– Qb4 27.Ng5 e5 28.Qf5 Nf8 29.Qc8 Ba2 30.Ba2 Ra2 31.Qc4?? Qc4= 32.Rc4 f6 33.Nf3 Ra1 34.Kh2+– ed4 35.Nd4 Rd1 36.f3 Rd2 37.h4 h5 38.Nf5 Nd7 39.Ne7 Kf7 40.Nd5 Rd5? 41.ed5 Nc5 42.Rc5! (42...bc5 43.b6+–) 1–0. Dolejs,Dan E – Gloistein,Bruce N, corr NZCCA TT res, 2000.

4.Bb2 Bf5 5.Ne2 (5.Nf3 e6=) 5...e6 6.Ng3 Bg6 7.Nc3 (7.Be2 Bd6=) 7...Bd6=+ 8.Nce2 Nbd7 9.h4 (9.Nf4 Bf4 10.ef4 Qe7=+) 9...h6 10.Nf4 Bh7 11.Ngh5 Rg8 (11...0–0 12.Nf6 Nf6 13.g4=+) 12.c4 dc4 13.Bc4 Qe7 (13...e5 14.Nf6 Nf6 15.Ne2=) 14.Rc1 Ne5 (14...Rd8 15.Nf6 Nf6 16.Qe2=) 15.Nf6 gf6 16.Be2 b6 (16...Rd8 17.d4=) 17.d4 0–0–0 18.Kf1 (18.Qb3 Nd7+=) 18...Nd7= 19.Bf3 (19.Nd3 e5=) 19...Kb8 (19...Bf4 20.ef4 Qd6 21.g3+=) 20.Qb3 Bf5 21.Nd5 Qf8 22.Qc4 Nc5? 23.dc5+– Bc5 24.Nf4 e5 25.Nd5 Qd6 26.e4 Bg4 27.Bg4 Rg4 28.Qe2 Rdg8 29.g3 f5+/– 30.Rd1 Re4 31.Qf3 Qe6 32.Kg2 Reg4 33.Ne3 Be3 34.Qe3 e4 35.Rd4 Qa2 36.Qc3 Qe6?? 37.Rc1+– Rc8 38.Rd8! Qe7 39.Rc8 Kc8 40.Qc6 Rg6 41.Qa8 Kd7 42.Rd1 Rd6 43.Ba3 e3 44.Rd6 cd6 45.Qb7 Ke6 46.Qe7 Ke7 47.fe3 Ke6 48.Kf3 Kd5 49.Kf4 Kc4 50.Bd6 Kb5 51.Kf5 (51...Kc6 52.Bf8+–; 51.h5 a4+–) 1–0. Skoeld,K – Joffe,M, Stockholm, Sweden, 1959.

4.c4 e5 5.Ba3 (better 5.cd5!? Nd5 6.Bb2=) 5...Ba3–/+ 6.Na3 0–0 (6...Qe7 7.Qb3–/+) 7.d4 (7.cd5 Nd5 8.Nf3 e4–/+) 7...ed4 (7...Qe7 8.de5 Ng4 9.Qb3–/+) 8.Qd4 Qe7 9.Qb2 d4! 10.0–0–0 (10.Qd4 Qb4 Double attack (10...Qa3 Deflection)) 10...de3–+ 11.Re1 Ng4 12.Nf3 Nf2 (12...Nd7 13.Nb1 Re8 14.fe3–+) 13.Qf2 Qa3 (13...ef2? 14.Re7 Nd7 15.Be2+–) 14.Qb2 Qb2 15.Kb2 Re8 16.Nd4 Nd7 17.Nf5 (17.Nc2 Nc5–+) 17...Nc5 18.Ne3 Bf5! 19.g3 (19.Nf5 Na4 Double attack (19...Re1 Pinning; 19...Re1 Deflection)) 19...Rad8 (19...Re6 20.Nc2 Be4 21.Rg1–+) 20.Rd1 (20.Kc1 Bd3 21.Nc2 Be4–+) 20...Rd1 21.Nd1 Re1 22.Nc3 (22.Nf2–+) 22...Bh3!! 23.Bg2 (23.Bh3 Nd3 Double attack (23...Rh1 Pinning; 23...Rh1 Deflection)) 23...Bg2 24.Re1 Nd3 25.Kc2 (25.Kb3 Ne1 26.Ka4 b6–+) 25...Ne1 26.Kd2 (26.Kb3 Kf8–+) 26...Nf3 27.Ke3 Ng5 (27...Nh2 28.Kf2 Bh3 29.g4–+) 28.Kf2 (28.Nd1 Kf8–+) 28...Bh3 (28...Ne4 29.Ne4 Be4 30.Ke3–+) 29.Nd5 (29.Ke2 f6–+) 29...Ne6 30.b6 (30.Ke2 f6–+) 30...cb6 31.Kf3 (31.Nb6 f6–+) 31...b5! 32.cb5 Nd4 (32...Nd4 33.Kf4 Nb5–+) 0–1. Derbin,Alexey (1965) – Kuznetsov,Evgeny (2190), Novokuznetsk Russia, Kuzbass Open, 2013.

4.Nf3 e6 5.c4 dc4 6.Bc4 Be7 7.a4 0–0 8.d4 Nbd7 9.Ba3 Nb6 10.Be2 Nbd5 11.Be7 Qe7 12.0–0 c6 13.Qb3 cb5 14.Bb5 b6 15.Bc6 Rb8 16.Nc3 Nb4 17.Be4 (17.Ne5!?+=) 17...Ne4= 18.Ne4 Ba6 19.Rfb1 (better 19.Rfc1=) 19...Bd3–/+ 20.Rc1? (better 20.Nc3 Bc2 21.Qa3 Bb1 22.Rb1–+) 20...Be4–+ 21.Nd2 Bd5 22.Qc3 (22.Qd1 Rfd8–+) 22...Na2 (better 22...Qb7 23.Qc7 Bg2 24.Qb7 Bb7–+ (24...Rb7?! 25.Kg2 Rd8 26.Nb3–/+)) 23.e4 (23.Ra2 Ba2 24.e4–+) 23...Nc3 24.Rc3 Ba8 (better 24...Qb4!? 25.Rcc1–+) 25.Rac1 (25.Re3 Qb4 26.Nf3 f5–+) 25…Qb4 0–1. klinealan – silhouet2003, gameknot.com, 2021.

4.Nf3 Bf5 5.Be2 e6 6.0–0 (6.Bb2 Bd6=) 6...Nbd7 (6...Bd6 7.Bb2=) 7.d3 (7.Nh4 Be4=) 7...Be7 (7...e5 8.c4 dc4 9.dc4=) 8.c4 (8.Bb2 Bd6=) 8...0–0 (8...dc4 9.dc4 0–0 10.Bb2=) 9.Nc3 (9.Nh4 Bg4=) 9...dc4 10.dc4 Nc5 (10...Qe8 11.Nh4=) 11.Ba3 (11.Nd4 Bg6=) 11...Qd1 (11...Qe8 12.Nd4=) 12.Rfd1 Rfe8 13.Kf1 (13.Nh4 Bg4=) 13...Nfe4 (better 13...a4=) 14.Bc5 (better 14.Ne4 Be4 15.Rd4+=) 14...Nc3–/+ (14...Nc5?! 15.Rd2=; worse 14...Bc5 15.Ne4 Be4 16.Ng5+=) 15.Be7 Nd1 (15...Re7?! 16.Rdc1 Ne2 17.Ke2=) 16.Ba3 (16.Rd1 Re7 17.Nh4 Be4–/+) 16...Nc3–+ 17.Bb2 (17.Nh4 Ne2 18.Ke2 Rad8 19.Nf5 ef5–+) 17...Ne2 18.Ke2 Rad8 19.Ne1 (19.a4 Bd3 20.Ke1 Bc4–+) 19...f6 (19...e5 20.Rc1–+) 20.f3 (20.Kf3 e5–+) 20...e5 21.e4 Be6 22.Rc1 b6 (22...Re7 23.a4–+) 23.Nd3 (23.a3 Rd7–+) 23...Rc8 (23...Rd7!? 24.Rc2–+) 24.a4 c6 25.c5 (25.bc6 Rc6 26.c5 Rb8–+) 25...cb5 26.ab5 bc5 27.Rc5 (27.Ba3 c4 28.Nc5 Rb8–+) 27...Bc4 28.Ke3 Bb5?? (better 28...Rc5 29.Nc5 Rb8–+) 29.Rc8?? (better 29.Rb5 a4 30.Rb4+=) 29…Rc8–+ 0–1. Lance5500 (2530) – FeegLood (2615), lichess.org, 2015.

4.Nf3 Bg4 5.Bb2 g6 (5...e6 6.h3 Bh5 7.g4=) 6.Be2 (6.h3 Bf3 7.Qf3 Bg7+=) 6...Bg7= 7.a4 (7.0–0 0–0=) 7...c5 (7...0–0 8.0–0=) 8.c4 (8.h3 Bf3 9.Bf3 0–0=) 8...0–0 9.0–0 Re8 (9...dc4 10.Qc2=) 10.cd5 Nd5 (10...Qd5 11.Nc3 Qd6 12.d4=) 11.Bg7+= Kg7 12.d4 Nd7 (12...Qd6!?+=) 13.dc5+/– Nc5? ( 13...N7f6+/–) 14.Qd4+– (14...Nf6 15.Qc5+–) 1–0. Horsak,Antonin (1895) – Stastny,Pavel (1780), Plzen op–B, 2001.

4.Bb2 e6

5.c4 c6 6.a4 Be7 7.Nf3 0–0 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 Be7 5.Nf3 c6 6.a4 0–0 7.c4 a5).

5.Nf3 =.

3.Nf3 c5

4.Bb2 f6 5.Nc3 (5.c4 e5=) 5...e5 (5...d4 6.Ne4=) 6.e4 d4 (6...Ne7 7.Be2=) 7.Nd5 (7.Na4 Be6=) 7...Ne7= 8.Bc4 Nd5 (8...Nd7 9.Ne7 Qe7 10.c3=) 9.Bd5 Nd7 10.Be6 Qe7 11.Bg4 h5 (11...c4 12.a4=+) 12.Bf5= Rh6 (12...Qf7 13.0–0=) 13.0–0 g6 14.Bh3 Bg7 (14...c4 15.Rb1=) 15.a4 (15.Qe2 c4+=) 15...b6 (15...c4 16.Ba3 Nc5 17.Bc8 Rc8 18.Re1=) 16.Qe2+= Bb7 17.Bc1 Nf8 (17...0–0–0 18.c3=) 18.c3 Ne6 19.d3 g5 20.cd4 (20.Nh4 dc3 21.Be6 Qe6 22.Nf5+=) 20...cd4 (20...g4!? 21.Bh6 Bh6=) 21.Nh4!+/– Qf7? (21...gh4 22.Bh6) 22.Nf5+– 0–0–0? (22...Kd7 23.Nh6 Bh6+–) 23.Qa2 (23.Ng7!? Qg7 24.Be6 Kb8+–) 23...Nf4 (23...g4 24.Ng7 Rg6 25.Ne6 Re8 26.Bg4 hg4 27.Nd4 Qa2 28.Ra2 ed4 29.Rc2 Kb8+–) 24.Qf7 (24...Nh3 25.gh3+–) 1–0. market (2240) – Cerati (1910), GameColony.com, 2002.

4.Bb2 Nf6 5.e3=.

4.Bb2 Bg4 5.e3 Nd7 6.h3 Bh5 7.Be2 Ngf6 8.Nc3 (8.g4 Bg6=) 8...e6 9.Rb1 (9.g4 Bg6=) 9...Bd6=+ 10.g4 Bg6 11.g5 (11.Nh4 Be4 12.Rg1 0–0=+) 11...Ne4 12.Ne4 (12.h4 0–0=+) 12...de4–/+ 13.Nh4 0–0 ( 13...Qg5!? 14.Ng6 hg6–/+ (14...fg6?! 15.Bg7 Rg8 16.Bc3=)) 14.Ng6= hg6 15.d3 ed3 (15...Qg5 16.de4 Qe7 17.h4=) 16.Qd3+= Ne5 (16...Be5 17.Be5 Ne5 18.Qd8 Rfd8 19.f4+/–) 17.Qe4 Qg5 18.Rd1 (< 18.Qb7 Qf5 19.Rc1 c4=) 18...Bb8 19.f4 Qg3 (19...Qh4 20.Kf1 f6 21.Qb7+– (< 21.Be5 fe5 22.Bf3 ef4=+)) 20.Kf1+– f5 (20...f6 21.Qb7 Ra7 22.Qg2 Qg2 23.Kg2+–) 21.Qb7 Ra7 22.Qg2 Qe3 (22...Qg2 23.Kg2 Nf7 24.Bc4+–) 23.fe5 Be5 24.Be5 Qe5 25.Qg6 Qf4 26.Kg2 Qe4 27.Kf2 Qf4 28.Bf3 e5 (28...Qc4 29.Rd2+–) 29.Kg2 e4 30.Be2 e3 (30...Qh6 31.Bc4 Kh8 32.Qh6 gh6+–) 31.Rhf1 Qe4 32.Bf3 Qc2 (32...Qe8 33.Bd5 Kh8 34.Qe8 Re8 35.Rf5 g6+–) 33.Kg1 e2 (33...Qa2 34.Bd5 Qd5 35.Rd5+–) 34.Bd5 Raf7 35.Bf7 Rf7 36.Rd8 Rf8 37.Rf8 Kf8 38.Rf5 Kg8 39.Qe8 Kh7 40.Rh5# 1–0. b4_player (2235) – lisarik (1930), GameColony.com, 2003.

4.c4 e6 5.e3=.

4.c4 Nf6 5.cd5 e6 (5...Qd5 6.Bb2=) 6.de6+= Be6 7.Bb2 Be7 (7...Bd6 8.Qc2+=) 8.Qc2 0–0 (8...a4 9.e4+–) 9.Ng5+– h6 (9...Qd7 10.Ne6 fe6 11.e3+–) 10.Ne6 fe6 11.e4 Nbd7 (11...Nh5 12.Bc4 Qd7 13.0–0+–) 12.Bc4+– Qb6 13.f4 (better 13.Qb3 Kf7 14.0–0+–) 13...Ne4?? (better 13...Kh8+–) 14.Qe4+– Nf6 (14...Kh8 15.Qg6 (15.Qe6?! Bf6 16.Qb6 Nb6 17.Bf6 Nc4+–) 15...e5 16.Qe6+–) 15.Qe6 Qe6 16.Be6 Kh8 (16...Kh7 17.Nc3+–) 17.Nc3 Bd6 18.0–0 (18.f5 a4+–) 18...Rae8 (18...Rad8 19.Rae1+–) 19.Rae1 Nh5 (19...Re7 20.f5+–) 20.f5 c4 (20...Nf6 21.Ne4 Be7 22.d4 Ne4 23.Re4+–) 21.Ne4 (21.Ne4 Bb4 22.Bc4+–) 1–0. michaelbuss (2845) – moxxee (1755), ChessWorld.net, 2010.

4.d3 e6 5.Nbd2 (5.e4 Nd7 6.Bb2 Ngf6=) 5...Nf6= 6.e4 b6 (6...Nbd7 7.g3=) 7.e5+= Nfd7 8.g3 (8.Qe2 g5 9.g4 Bg7+=) 8...Bb7 (8...g5 9.h3+=) 9.Bg2+/– Be7 10.0–0 0–0 (10...Nf8 11.c4+=) 11.a4 (11.Qe2 Re8+=) 11...Re8+= 12.Bb2 Nf8 13.Ne1 (13.h4 Nbd7+=) 13...Nbd7 14.f4 Qc7 15.c4 d4 (15...h6 16.Qg4+=) 16.Bb7+/– Qb7 17.Qe2 h6 18.Nef3 Ng6 19.h4 Bd8 20.h5 Ne7 21.g4 Bc7 22.Ne4 Rf8 23.Nh4 Rab8 24.Qg2 Kh8 (24...f5 25.gf5 Nf5 26.Nf5 ef5 27.Ng3 Qg2 28.Kg2+/–) 25.Qh3 Ng8 (25...Kg8!?+/–) 26.Rae1+– Rbe8 27.g5 Qb8 28.Re2 (28.Rf2+–) 28...Ne7 (better is 28...Qc8!?+/–) 29.Rg2+– White plans g6 29...Qd8 30.Qg4 Rg8 31.g6 Nf5 32.gf7 Qh4 33.fe8R (33.Qg6 Qd8+–) 33...Re8 34.Qh4 Nh4 35.Rh2 Bd8 36.Kf2 Rf8 37.Ke2 Kg8 38.Bc1 Nf5 39.Rg1 Bc7 40.Ng3 Ne7 41.Kd1 Kh7 42.Rhg2 Kg8 43.Bd2 Kf7 44.Kc2 Rg8 45.Rh1 Rf8 46.Kb3 Re8 47.Be1 Rf8 48.Rhg1 Rd8 49.Re2 Re8 50.Rh2 Rf8 51.Bd2 Re8 52.Kc2 Ra8 53.Kd1 Rf8 54.Ke2 Ra8 55.Rhg2 Rg8 56.Be1 Ke8 57.Ne4 Kf7 58.Bd2 Nf5 59.Rg6 Bd8 60.R6g4 Bc7 61.Ng3 Ne7 62.Re1 Nf8 63.Rh1 Nd7 64.Be1 Ra8 65.Rg1 Rc8 66.Kd1 Rg8 67.Kc2 (67.Bd2 Rf8+–) 67...Nf8 (67...Ra8 68.Ne4 Nf5 69.Bf2+–) 68.Bd2 Nd7 69.Kd1 Rf8 70.Rh1 Re8 71.Kc2 (71.Ne4 Nf5+–) 71...Rf8 (71...Rg8 72.Ne4+–) 72.Be1 (72.Ne4 Nf5+–) 72...Ra8 73.Rg1 Rg8 74.Nf1 Nf5 (74...Bd8 75.Bh4+–) 75.Bd2 (75.Bf2 Re8+–) 75...Bd8 76.Ng3 Ne7 77.Re1 Nf8 78.Rf1 (78.Ne4 Bc7+–) 78...Nd7 (78...Bc7 79.Rh1+–) 79.f5 ef5 (79...Bc7 80.Re4+–) 80.Nf5 Nf5 81.Rg6 Ne5 82.Rf5 Bf6 83.Re5! Be5 84.Rb6 Ke7 85.Ba5 Kd7? (85...Rf8 86.Rc6 Rf2 87.Kb3 Rf3 88.Rc5 Ke6+–) 86.Rb7 Kc8 87.Re7 Bd6 (87...Bb8 88.Re6 Kd7 89.Rg6+–) 88.Re6 Kd7 89.Rg6 Be5 (89...Ra8 90.Rg7 Kc8 91.Rg8 Kb7 92.Ra8 Ka8 93.Bd2+–) 90.Bb6 Rf8 91.a5 Rf2 (91...Rc8 92.a6+–) 92.Kd1 Rf3 (92...Bf6 93.a6 Kc8 94.Bc5+–) 93.Ke2 Re3 (93...Rf8 94.a6 Rc8 95.a7+–) 94.Kd2 Bf6 (94...Rh3 95.a6 Rh2 96.Kd1 Rh1 97.Kc2+–) 95.Bc5 Re8 (95...Kc8 96.a6 Re8 97.Bd6+–) 96.Rg4 Re6 (96...g5 97.hg6 h5 98.Rg1+–) 97.Bd4 g5 (97...Re8 98.Kc3+–) 98.hg6 Bg5 (98...h5 99.g7 Re8 100.g8N Rg8 101.Rg8 Bd4 102.b6+–) 99.Kc3 Rg6 100.Rg1 Rg8 (100...Kc7 101.a6 Re6 102.Rf1+–) 101.b6 Kc6 102.a6 (102.a6 Rb8 103.Re1+–) 1–0. pman3660 (2300) – housemd (2025), gameknot.com, 2015.

4.d3 g6 5.Bb2 Nf6 6.g3 =.

4.d4 c4 5.e4 e6 6.Be2 de4 7.Ne5 Nd7 8.Nc4 Ngf6 9.0–0 Be7 10.f3 0–0 11.Nc3 ef3 12.Bf3 Nb6 13.Ne5 Nfd5 14.Bd2 Bg5 15.Bg5 Qg5 16.Ne4 Qe3 17.Kh1 f6 18.Re1 Qa3 19.Qd3 Qe7 20.Nc4 Nc4 21.Qc4 Bd7 22.Nc5 b6?? (Better is 22...Nb6 23.Qe2 e5+–) 23.Ne6!! (< 23.Bd5 bc5 24.Ba8 Ra8 25.dc5 Rb8+–) 23...Be6 (23...Qe6 24.Bd5) 24.Re6! (24...Qc7 25.Bd5 Qc4 26.Bc4+–; 24.Bd5?! Bd5 25.Qd5 Qf7+/–) 1–0. marre (1990) – SDR84 (1910), GameColony.com, 2003.

4.d4 e6 5.g3 (5.e3 c4=) 5...Nf6=+ 6.Bg2 Nbd7 (6...Qb6 7.a4=+) 7.e3 (7.0–0 cd4 8.Qd4 Bc5=+) 7...a4 8.Nc3 (8.0–0 Qa5=+) 8...cd4 9.ed4 Qa5 10.Qd3 Ne4 11.Bd2 Nd2 12.Kd2 (12.Nd2 Nf6=+) 12...Bb4 ( 12...Nb6 13.Kd1 Nc4–+) 13.Bf1?? ( 13.a3 Be7 14.Kd1–/+) 13...Nf6–+ 14.Ng5 h6 15.a3 Bc3 (15...hg5?! 16.ab4 Qb4 17.Bg2–+) 16.Qc3 Qc3 17.Kc3 hg5 (18.Bd3 Ng4–+) 0–1. Fredriksen,Jan Gunnar – Kristiansen,Erling (2210), NOR–chT qualifier, 2002.

4.d4 cd4

5.Qd4 Nf6 6.c4 b6 7.Nc3 e6 8.cd5 ed5 9.Bg5 Bb4 10.0–0–0 Ba3 11.Kb1 Bf5 12.e4! Bc5?? (12...de4 13.Qd8) 13.Qe5 Be6 14.ed5 (14.Nd5?! Kf8 15.Qc7 Nbd7 16.Qd8 Rd8 17.Nf6 gf6 18.Bf6 Nf6 19.Rd8 Kg7 20.Rh8 Kh8+–) 14...Nbd7 15.Qe1 (15.de6?! Ne5 16.Rd8 Rd8 17.Ne5 fe6+–) 15...0–0 (15...Bf2 16.Qe2 h6 17.de6 fe6+–) 16.de6 fe6 17.Qe6 Kh8 18.Ne5 Qc7 (18...Ra7 19.Nc6 Qa8 20.Na7 Qa7+–) 19.Nd7 Nd7 (19...Bf2 20.Bf6 Rf6 21.Nf6 Qc3 22.Qe4 Qb4 23.Qb4 ab4 24.Nd5+–) 20.Rd7 Qc8 21.Bd3 Bd4 22.Qe4 g6 23.Qd4 (23…Rf6 24.Qf6 Kg8 25.Qg7#) 1–0. guest1400 – guest2143, ICC, 2003.

5.Qd4 Nf6 6.e3 =.

4.e3 Nf6

5.Bb2 e6 6.Be2 Nbd7 7.0–0 Bd6 8.c4 0–0 9.d4 b6 10.Nbd2 Bb7 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c5 5.Nf3 Bd6 6.c4 Nbd7 7.Be2 0–0 8.0–0 b6 9.d4 Bb7 10.Nbd2 a5).

5.Be2 e6 6.0–0 Bd6 7.Bb2 Nbd7 8.d3 b6 9.Nbd2 Bb7 10.c4 0–0 11.Rc1 Rc8 12.a4 Re8 13.Qb3 Bb8 14.Rfd1 e5 15.cd5 Nd5 16.Bf1 Qf6 17.e4 Nb4 18.Nc4 Rcd8 19.Be2 Nf8 20.g3 Nd7 21.Nh4 Qe6 22.Nf5 Nf6 23.Rf1 Bc7 24.Rcd1 Rd7 25.f3 Red8 26.Qc3 Nfd5 27.Qc1 Ne7 28.Ne7 Re7 29.Qc3 f5 30.Ne3 g6 31.f4 Rd4 32.Qc1 ef4+= 33.Bd4 cd4 34.Ng2 Na2 35.Qd2 fg3 36.Bf3 fe4–+ 37.de4 Nc3 38.Rde1? Qh3 (38...Qh3 39.hg3 Bg3–+) 0–1. Gunawan,Ro (2420) – Gunawan,J (2265), Telin International Open, 2011.

4.e3 Bg4

5.Bb2 Nf6 6.c4 e6 7.h3 Bh5 8.a4 (8.d4 cd4 9.Bd4 Bb4 10.Bc3 Bc3 11.Nc3 Qc8=) 8...Be7 9.Be2 0–0 10.d3 dc4 11.dc4 Qd1 12.Bd1 Nbd7 13.Nbd2 Nb6 14.g4 Bg6 15.Be2 (15.Ne5!?=) 15...Rfd8=+ 16.Bc3 Ne4 17.Ne4 Be4 18.0–0 h6 (18...Nc4 19.Bc4 Bf3 20.Rac1–/+) 19.Nd2 Bd3 (19...Bc2 20.Ra2 Ba4 21.Rfa1=) 20.Bd3 Rd3 21.Rfc1 Nd7 (21...Kf8 22.Ne4=) 22.Ne4 (22.Kf1 Bf6 23.Ne4 Bc3 24.Rc3 Rc3 25.Nc3 Ne5=) 22...f5 23.Rd1?? ( 23.gf5 ef5 24.Ng3=) 23...fe4–+ 24.Rd3 ed3 25.Rd1 b6 26.Rd3 Rd8 27.e4 Nf6 28.Re3 Ne8 29.f4 Nd6 30.Be5 Nc4 (31.Rc3 Ne5 32.fe5 Rd4–+) 0–1. Zylla,Johannes – Mueller, BS–Stadtm., 1991.

5.Be2 Nf6 6.0–0 e6 7.d4 Nbd7 8.Ba3 Qc7 9.Nbd2 Bd6 10.c4 0–0 11.cd5 Nd5 12.dc5 Nc5 13.Rc1 b6 14.Ne4 Rad8 15.Nd6 Bf3 16.Bf3 Rd6 17.Qc2 Nb4 18.Bb4 ab4 19.Rfd1 Rfd8 20.Rd6 Qd6 21.Rd1 Qe7 22.Rd4 e5 23.Rb4 g6 24.Rc4 e4 25.Be2 Qe5 26.Rc3 g5 27.a3 Kg7 28.g3 Rd7 29.Rc4 Qa1 30.Qc1 Qc1 31.Rc1 Rd2 32.Bc4 Nd3 33.Bd3 ed3 34.Rc3 Kf6 35.Kg2 Ke5 36.g4 f5 37.gf5 Kf5 38.h3 Ke5 39.Kf3 h5 40.Kg3 Rd1 41.Kg2 Kf5 42.a4 Ke6 43.Rb3 Ke5 44.Rb4 Ra1 45.Rd4 Rd1 46.h4 g4 47.Rd7 Ke4 48.Rd8 Ke5 49.Rd4 Rd2 50.Rd7 ½–½. Rosner,Dirk – Blankenberg,Bruno, Tiger SC, 1999.

4.g3 Nd7

5.d3 e5 6.e4 d4 (6...Ngf6 7.ed5 Nd5 8.Bg2+=) 7.Na3+= f6 8.Bh3 Nb6 9.Bc8 Qc8 10.Nd2 Qh3 11.Ndc4 Nc4 12.Nc4 (12.dc4? Qg2 13.Rf1 Qe4 14.Qe2 f5–+) 12...a4 13.Qe2 h5 14.f4 h4 15.g4 (15.fe5?! hg3 16.ef6 gf6+=) 15...ef4 (better is 15...Nh6 16.fe5 Ng4+/–) 16.Bf4+– g5 17.Bd2 0–0–0 (17...Nh6 18.Rg1 Nf7 19.0–0–0+–) 18.0–0–0 Nh6?! (18...a3+–) 19.Rhg1 Bd6 20.Nd6 Rd6 21.Rdf1 Ng4 22.Qg4 (22.Qg4 Qg4 23.Rg4+–) 1–0. bla_ner (1920) – cachisss (1945), gameknot.com, 2015.

5.Bg2 e5 6.d3 f5 (6...Ngf6 7.c4+=) 7.e4+/– de4 (7...fe4 8.de4 d4 9.Na3+/–) 8.de4 fe4 9.Ng5 Ngf6 (9...Nh6 10.Ne4 Nf5 11.Bg5+/–) 10.Na3 (10.Nc3 h6 11.Nge4 Be7+–) 10...Be7 (10...Qc7!? 11.0–0 Nb6+=) 11.Ne6+– Qb6 12.Ng7 Kf7 13.Nf5 Rd8 (13...Qe6 14.Ne7 Qe7+–) 14.Qe2 Nf8 15.Nc4 Qc7 16.b6 Qb8 17.Be4 Bf5 (17...Ng6 18.Ne7 Ke7 19.Bg6 hg6+–) 18.Bf5 Ng6 19.0–0 (19.Bb2 Kf8+–) 19...Rd4 (19...e4 20.Bb2 Nf4 21.Qe3+–) 20.Bb2 Rd5 (20...Qd8+–) 21.f4! e4 (21...ef4 22.Be6 Double attack (22.Qe6 Deflection; 22.Bg6 Decoy)) 22.Be4 Ne4 (22...Rd4 23.Bg2+–) 23.Qe4 0–1. bla_ner (2050) – housemd (2040), gameknot.com, 2015.

3.Nf3 Bf5

4.Bb2 Nf6 5.e3 e6 6.Be2 a4 7.Nh4 Bg6 8.0–0 a3 9.Bd4 (9.Ng6?? ab2 (9...hg6?! 10.Bd4=) 10.Nc3 ba1R (10...ba1N?! 11.Nh8 Bd6 12.Qa1–+) 11.Qa1 hg6–+) 9...c6 10.c4 Nbd7 11.d3 c5 12.Bc3 dc4 13.dc4 Ne4 14.Ng6 hg6 15.h3 Nc3 16.Nc3 Be7 17.Qb3 Qa5 18.Rab1 0–0 19.Rfd1 Nb6 20.Bf3 Rab8 21.Ne4 Rfd8 22.Rbc1 f5 23.Ng3 Bf6 24.Ne2 Qa4 25.Qa4 Na4 26.g3 g5 27.e4 Rd1 ½–½. flipper – peze, playchess.de, 2004.

4.e3 Nd7

5.Bb2 Nb6 6.a4 (6.Bd3 Bd3 7.cd3 e6+=) 6...e6 (6...Nf6 7.Nc3=) 7.Ne5 (7.Bd4 Nf6=) 7...f6 (7...Nf6 8.g4 Bg6 9.h4+=) 8.Nf3 (8.g4 Be4 9.Nf3 Nh6=) 8...e5 9.d3 (9.Nh4 Be6=+) 9...Be6 (9...Bb4 10.Nbd2=+) 10.Nbd2 Nh6 (10...Bb4 11.c3 Bd6 12.Qc2=) 11.Be2= Bd6 12.0–0 0–0 13.c4 Qe7 (13...Re8 14.Qc2 Bb4 15.Rfc1=) 14.Qc2 c6 (14...Rfd8 15.h3=) 15.Rfc1 Nd7 (15...c5 16.h3=) 16.e4 (16.h3 Rfe8+=) 16...f5 (16...d4 17.Rcb1=+) 17.bc6 bc6 18.cd5 cd5 19.ed5 (19.Qc6 Bf7 20.Rab1 Rab8=) 19...Bd5= 20.Nc4 e4 (better 20...Rac8 21.Qd2 Bb4=) 21.Ne3?? (better 21.de4 Be4 22.Qd2+=) 21...Be6 (better 21...ef3 22.Nd5 Qe2 23.Qe2 fe2–+) 22.de4+– fe4 23.Qe4 Nc5 (23...Nf6 24.Bf6 Qf6 25.Rab1+–) 24.Rc5! Bc5 25.Ng5?? (better 25.Bd3 Rf3 26.Qh7 (26.Qa8?! Rf8 27.Qe4 Rf2 28.Kf2 Ng4 29.Ke2 Ne3+–) 26...Kf8 27.gf3+–) 25...Be3?? (better 25...Qg5 26.Qe6 Kh8=+) 26.Qh7 (26.fe3 Qg5 27.Qe6 Kh8=+; 26.Qe3?! Rfe8 27.Qe6 Qe6 28.Ne6 Rab8+– (28...Re6?? 29.Bc4 Rae8 30.Re1+–); 26.Ne6?! Bf2 27.Kh1 Rae8+=) 1–0. Sopko,Cassio Roberto (1930) – Guisande,Fernando (1895), 10th American Continental Championship, 2015.

5.Bb2 Ngf6 6.Nc3 =.

5.Nc3 e6 6.Bd3 Bd3 7.cd3 =.

5.Be2 Ngf6=.

4.e3 e6

5.c4 Bb1 6.Rb1 Nf6 7.Bb2 Bb4 8.cd5 Qd5 9.a3 Bc5 10.d4 Bd6 11.Qc2 0–0 12.Bc4 Qe4 13.Bd3 Qd5 14.e4 Qa2 15.Bc4 Qb1 16.Qb1 Rd8 17.e5 Be5 18.de5 Nd5 19.Qe4 f6 20.ef6 gf6 21.Bf6 Nf6 22.Qe6 Kg7 23.Qf7 Kh8 24.Qf6# 1–0. Bonetti,Shane – LendaFan, ICC, 2002.

5.d4 Bb4 6.c3 Bd6 7.Bb2 Bb1 8.Rb1 Nf6 9.Be2 0–0 10.0–0 Nbd7 11.c4 dc4 12.Bc4 Ne4 13.a4 Qf6 14.Bd3 Qf5 15.Qc2 Ndf6 16.Ne5 Be5 17.de5 c5 18.ef6 gf6 19.Be4 Qg5 20.Bb7 Rad8 21.Qc3 Qf5 22.Qa5 c4 23.Ba3 Rfe8 24.Bc6 Rf8 25.Rfc1 Qg4 26.Bf8 Rf8 27.Qb4 Rd8 28.a5 Kg7 1–0. Bonetti,Shane – LendaFan, ICC, 2002.

5.Nd4 Nh6 =.

5.Be2 Nd7= 6.0–0 h6 (6...Bd6 7.Nc3=) 7.Bb2 Ngf6 8.c4 Bd6 9.d4 (9.Nd4 Bh7=) 9...c5 (9...dc4 10.Nbd2+=) 10.cd5= ed5 11.dc5 Nc5 12.Nc3 0–0 13.Rc1 (13.Nd5?? Nd5 14.Bc4 Nf6–+) 13...Re8 14.Na4 (14.Nd5?? Nd5 15.Bc4 Nf6–+) 14...Nfe4 15.h3 Na4 16.Qa4 Bb4 17.a3 Be7 18.Nd4 Bg6 19.Qd1 Bf6 20.a4 Qd6 21.Bg4 Qb4 22.Ba1 Rad8 23.Rc7 Re7 24.Qc1 Rde8 25.Re7 Qe7 (worse is 25...Re7 26.Qc8 Kh7 27.Nf5 Ba1 28.Ra1=) 26.Bf3 Kh7 (26...Bg5 27.Be4 Be4 28.Qc3=) 27.Rd1= Qb4 28.Ne2 Qa4 29.Be4 Be4 30.Bf6 gf6 31.f3 Bf5 (31...Rc8 32.Qa1 Qa1 33.Ra1=) 32.Nc3 (32.Rd5 Be6 33.Rc5 b6 34.Qb1 f5=) 32...Qb3 33.Nd5 (worse is 33.Rd5 Re5 34.Qd2 Rd5 35.Nd5 Qd3+=) 33...Rc8 (33...Kg7 34.Qa1 Re5 35.e4+=) 34.Qa1 (34.Qd2 Rc2 35.Qa5 Rg2 36.Kg2 Qd1 37.Nf6 Kg6=) 34...Be6= (34...Qb5? 35.Nf6 (35.Qf6?! Be6+=) 35...Kg6 36.g4+–) 35.Nf6 Kg6 36.Ng4 Bg4 37.hg4 Qe3 38.Kh1 Rc2 39.Qh8 (39.Qa5 Qf2 40.Rd6 f6 41.Qd2 Rd2 42.Rd2 Qd2 43.Kg1 Qe1 44.Kh2 Kg5 45.g3 Qf2 46.Kh3 Qg1 47.f4 Kg6 48.f5 Kg5 49.b6 Qh1) 39...Rd2 40.Rd2 Qd2 41.Qg8 Kf6 42.Qh8 Kg6 43.Qg8 Kf6 44.Qh8 Ke7 45.Qe5 Kd7 46.Qf5 Kd8 47.b6 (47.Qf7?? Qc1 48.Kh2 Qc7 49.Qc7 Kc7–+) 47...Qd1 48.Kh2 Qd6 49.Kh3 Qb6 50.Qd5 Ke8 51.Qe5 Kf8 52.Qh8 Ke7 53.Qe5 Kd7 54.Qd5 Kc7 55.Qf7 Kb8 56.f4 Qe3 57.g3 Qf3 58.Qe8 Kc7 59.g5 hg5 60.fg5 (60.Qe7 Kb6 61.Qf6 Kc7 62.Qg5 Qh1 63.Kg4 Qd1 64.Kh4 Qh1 65.Kg4 Qd1 66.Kh4 Qh1 67.Kg4=) 60...Qh1 (60...Qf5 61.Kh4=) 61.Kg4 Qd1 62.Kf5 Qf3 63.Kg6 Qg3 64.Qb5 Qa3 65.Kf7 a4 66.Qe5 Kb6 67.Qe6 Ka5 68.g6 Qf3 69.Ke7 Qa3 70.Ke8 Qc3 71.Kf8 Qc5 72.Kg8 b5 73.g7 a3 74.Qe8 Qc4 75.Kh8 Qh4 76.Kg8 b4 77.Qa8 Kb6 78.Qd5 Qf2 79.Qd6 Kb5 80.Qd5 Qc5 81.Qd7 Ka5 82.Qe6 Qf2 83.Qf7 Qd4 84.Kh7 Qd3 85.Kh6 Qd2 86.Kg6 Qd6 87.Kf5 Qd3 88.Ke5 Qe2 89.Kd6 Qa6 90.Kc5 Qb6 91.Kd5 a2 92.g8Q Qb5 93.Kd6 Qb6 94.Kd5 Qb5 95.Kd6 Qb6 96.Kd5 Qb5 97.Kd6 Qb6 98.Kd5 Qb5 ½–½. pman3660 (2260) – bla_ner (1965), gameknot.com, 2015.

3.Nf3 Nf6

4.Ba3 Nbd7 5.d4 Nb6 6.e3 g6 7.Nbd2 Bg7 8.Rc1 0–0 9.c4 Bg4 10.Bd3 dc4 11.Nc4 Nc4 12.Bc4 Rc8 13.h3 Bf5 14.0–0 Ne8 15.Qb3 Nd6 16.Bd5 Rb8 17.Ne5 Be4 18.Be4 Ne4 19.Qd3 Nd6 20.Rc2 Rc8 21.Rfc1 a4 22.Bd6 ed6 23.Nf3 Qd7 24.Qc4 d5 25.Qb4 f5 26.Qa4 Rf7 27.Qa7 f4 (27...Qb5 28.Ng5 Re7 29.Rc7 Rcc7 30.Rc7 Qe8 31.Rb7 Bf6 32.Re7 Qe7 33.Qe7 Be7+–) 28.Qb7 fe3 29.fe3 Qd8 30.Rc5 Bh6 31.R1c3 (31.Rd5?! Be3 32.Kh2 Qe8+–) 31...c6 32.Qa6 Re7 33.Rd5 Qd5 34.Qc8 Kg7 35.Qc6 Qa2 36.Ne5 Qe2 37.Ng4 Bg5 38.Kh2 Bh4 39.Rc2 Qe1 (39...Qd1 40.d5 h5 41.Rc1+–) 40.Qd6 h5 41.Rc6 (41…Bg3 42.Qg3 Qg3 43.Kg3 hg4 44.Kf4 gh3 45.gh3 Rf7 46.Ke4 Re7 47.Kd3+–) 1–0. Woelfelschneider,Peter – Malmstroem,Jan, VCC6.012, 2001.

4.Bb2 Bf5 5.e3 e6 6.Be2 Bd6 7.Nh4 Bg6 8.Nc3 Nbd7 9.f4 0–0 10.0–0 Ne4 11.Ng6 hg6 (11...Nc3 12.Bc3 fg6 13.Bd4=) 12.Ne4+/– de4 13.d3 ed3 14.cd3 Nb6 15.Bf3 Rb8 16.Qc2 Qe7 (16...Qe8 17.Qc3 f6 18.Qa5+/–) 17.Qc3 f5 18.Qa5 Rfd8 (18...g5 19.fg5 Qg5 20.Qe1+/–) 19.a4 (19.Qe1 Na4 20.Bd4 e5 21.fe5 Be5 22.Be5 Qe5+–) 19...Bb4 (19...Bc5 20.d4 Bb4 21.Qa7+=) 20.Qa7 Nd5 (20...Nc4 21.dc4 Bc5 22.Ba3 Ba3 23.Bb7+/–) 21.Bd4+– g5 22.fg5 e5?? ( 22...Qg5 23.Bd5 ed5+–) 23.Bd5 Kh7 24.Rf5 ed4 (24...Ra8 25.Qa8 Ra8 26.Re5+–) 25.Qd4 Bc5 (25...Rd5 26.Rd5 Re8+–) 26.g6 Kg6 (26...Kh6 27.Qf4 Kg6 28.Qg4 Qg5 29.Qg5 Kh7 30.Qh5) 27.Qg4 (27...Qg5 28.Qg5 Kh7 29.Qh5) 1–0. market (2055) – chamizo (1745), GameColony.com, 2002.

4.c4 e5 5.Ne5 Bd6 6.Nf3 Bg4 (6...0–0 7.Nc3 Be6 8.cd5 Nd5 9.g3=) 7.Nc3+= dc4 8.e3 0–0 9.Bc4 a4 (9...Nbd7!?+=) 10.0–0 Nbd7 11.d4 (worse is 11.Na4 Ne5 12.Be2 Nf3 13.Bf3 Bf3 14.gf3 Nd5–/+) 11...Qe7 12.Bd2 Nb6 13.Bd3 Rad8 (13...Nbd5 14.Nd5 Nd5 15.h3+/–) 14.Kh1 (14.h3 Bh5+/–) 14...Qd7 15.Re1 (15.Na4? Na4 16.Rb1 Nb6–+) 15...Rfe8 16.Rb1 (16.e4 Bb4 17.d5 Bc5+/–) 16...Bh5 17.Kg1 (17.Na4? Na4 18.Bb4 Ra8–+) 17...a3 (17...Nbd5 18.Nd5 (18.Qa4? Bf3 19.h3 Nc3 20.Bc3 Be4 21.Be4 Ne4–+) 18...Nd5 19.h3+/– (19.Qa4?! Bf3 20.gf3 Qh3+=)) 18.h3 Bf8 19.Rb3 h6 20.Qe2 Qe6 21.Rc1 Bd6 (21...Qc8 22.Qf1+–) 22.e4 Bf8 (22...Qd7 23.Be3 Bg6 24.Qc2+–) 23.Be3 Qd7 24.Qf1 Qe7 (24...Bg6 25.Ne5 Re5 26.de5 Qd3 27.ef6 gf6 28.Qe1+–) 25.Nh4 g6 (25...Qe6 26.Re1+–) 26.g4 Ng4 27.hg4 Bg4 28.Ng2 Bg7 29.f3 Bh3 30.Ne2 Rd7 31.Qf2 Be6 32.d5 Nd5 33.ed5 Bd5 34.Bc4 Bb2 35.Rc2 (35.Nef4 Bc4 36.Rc4 Rd1 37.Ne1 Ra1+–) 35...Bc4 36.Rc4 Rd1 37.Kh2 Ra1 38.Nc1 Qf6 (38...g5 39.f4 Qe6 40.Rc7 Ra2 41.Bd4+– (41.Na2?! Qb3 42.Nc1 Qb5+/–)) 39.f4 c6 (39...Re7 40.Rd3+–) 40.bc6 bc6 41.Rb6 Re6 42.Nd3 Ra2 (42...Qd8 43.f5 Rf6 44.Qf4+– (worse is 44.Nb2 Rf5 45.Qg3 Rh5 46.Rh4 Rh4 47.Qh4 Qc7 48.Qf4 Qf4 49.Bf4 ab2 50.Rb2 g5+–)) 43.Rb8 Kh7 44.Bd4 Bd4 45.Qa2 (45.Qd4?! Qd4 46.Rd4 Ree2=) 45...Re7 46.Rd4! (worse is 46.Qa3 Re2 47.Rd4 Qd4+–) 46...Qd4 47.Ne5 Qd6 (47...Qd5 48.Qa3 c5 49.Rc8+–) 48.Rf8 Qf6 49.Qa3 Re5 (49...h5 50.Nf3 Kg7 51.Ng5+–) 50.fe5 Qe5 51.Kg1 Qd4 52.Ne3 Qf6 53.Qa7 Kg7 54.Qc5 Qg5 (54...Kh7 55.Ng4 Qf4 56.Ne5 Qg3 57.Kf1 Qh3 58.Ke2 Qg2 59.Kd3 Qh3 60.Kd2 Qg2 61.Kc3 Qg3 62.Kb2 Qg2 63.Ka3 Qg3 64.Ka4 Qf4 65.Ka5+–) 55.Qg5 hg5 56.Rc8 c5 57.Rc7 1–0. pman3660 (2245) – manijer_wmp3 (2145), gameknot.com, 2015.

4.d4 c6 5.e3 Qb6 6.c4 dc4 7.Bc4 cb5 8.Qb3 e6 9.Bb5 Nc6 10.0–0 Bd7 11.Ba3 Ba3 12.Na3 0–0 13.Nc4 Qc7 14.Rfc1 Rfd8 15.Nce5 Be8 16.Rab1 Qe7 17.Bc6 bc6 18.Nc6 Bc6 19.Rc6 Qb4 20.Qc2 Qa3 21.Rb7 Nd5 22.Ng5 1–0. aspasio – JustinSane, ICC, 1999.

4.c4 dc4

5.Na3 =.

5.e3 Be6 6.Be2 (6.Bb2 Nbd7=) 6...g6 (6...Nbd7 7.0–0=) 7.Bb2 Bg7 8.Na3 c6 9.Qa4 The pressure on c4 grows (worse is 9.Bc4 Bc4 10.Nc4 cb5–/+) 9...cb5 10.Qb5 Bd7 11.Qc4 (worse is 11.Qb7 Bc6 12.Bf6 Bb7 13.Bg7 Rg8–/+) 11...Nc6 12.0–0 0–0 13.Qb3 (13.Rfc1 Bf5=) 13...Nb4 14.Nc4 b5 15.Nce5 Be6 16.Qd1 Ba2 17.Bb5 Qd5 18.Ba4 Ne4 Attacks the backward pawn on d2 19.Bd4 Ng5 20.Ng5 Be5 21.Be5 Qe5 22.Nf3 (22.Qg4 h5 23.d4 Qh2 24.Kh2 hg4=) 22...Qe6 23.Nd4 Qd6 24.Qg4 (24.Rc1 Bd5=) 24...e5 25.Qg3 Rac8 (25...Rfc8 26.Nf3 Bc4 27.Rfc1=) 26.Nf3= Bc4 27.Rfc1 Nd3 28.Rc3 Ba6 29.Bc2 Rc3 30.dc3 f6 31.Nh4 (31.Ne1 Rd8 32.Nd3 Bd3 33.Rd1+=) 31...g5 (better is 31...Rc8!? 32.Ng6 hg6 33.Qg6 Kf8+=) 32.Nf5+= (32.Ra5? Qb6 33.Bd3 Qa5 (33...Bd3?! 34.Ra1+=) 34.Ba6 Qa6–+) 32...Qc5 (32...Qc7 33.Qf3 Rd8 34.Rb1 Qc3 35.Bb3 Kh8 36.Nh6+/–) 33.Qf3 Qc3 (33...Rd8 34.Bb3 Kh8 35.Nd4+=) 34.Qd5 Attacking the isolated pawn on a5 34...Kh8 35.Rf1 Bc4 (35...Qc2 36.Qd7 Rg8 37.Qd6+–) 36.Qd7 Rg8 37.Qc6 Rg6 38.Ne7 Qc2 39.Qc8 Rg8 40.Ng8 Kg7 41.Ne7 Bb3 42.Qd8 Be6 43.Qa5 Nc1 (43...Qc4 44.Qa7 Kh6 45.Qa8+–) 44.Qa7 Kf8 (44...Ne2!? 45.Kh1 Kf8+–) 45.Ng6!+– Qg6 (45...Qg6 46.Qc5 Double attack (46.Rc1 Deflection); 45...hg6 46.Qa3 Double attack) 1–0. pman3660 (2250) – guerrer (2075), gameknot.com, 2015.

4.c4 e6

5.e3 Bb4 6.Nc3 =.

5.e3 c5 6.Be2 Bd6 7.0–0 0–0 8.Bb2 Nbd7 9.d4 b6 10.Nc3 Bb7 11.cd5 Nd5 12.Na4 (12.Qd2 Rc8=) 12...Qe7 13.g3 cd4 14.Nd4 Rac8 (14...Rfc8 15.Rc1 Rc1 16.Qc1=) 15.e4 N5f6 16.Rc1 Be5 17.f3 (17.f4 Rc1 18.Qc1 Bd4 19.Bd4 Qb4+=) 17...Rc1 18.Qc1 Rc8 19.Nc2 Bb2 (19...Qd6 20.Rd1 Qb8 21.Be5 Qe5 22.Qd2+=) 20.Qb2 g5 21.Ne3 g4 22.Ng4 Ng4 23.fg4 Be4 24.Qd4 Bd5 25.Nb6 Nb6 26.Qb6 Rc2 27.Rf2 Ra2 28.Qb8 Kg7 29.Qe5 Kg8 30.Qb8 Kg7 31.Qe5 Kg8 ½–½. pman3660 (2245) – forsetinn (2405), gameknot.com, 2015.

5.e3 Bd6 6.d4 c5 7.cd5 ed5 8.dc5 Bc5 9.Bb2 Bb4 10.Nbd2 0–0 11.Bd3 Nbd7 12.0–0 Nc5 13.Qb1 (13.Bc2 Bd7 14.a4 Nfe4=) 13...g6 14.a3 Nd3 (14...Bd2 15.Nd2 Qd6 16.Rc1=) 15.Qd3+= Be7 16.Rfc1 Bf5 17.Qd4 Qd6 18.h3 Be6 (18...h6 19.Nb3+=) 19.a4+= Rfc8 20.Ng5 h6 21.Ne6 Qe6 22.Nf3 Kg7 (22...Qd6 23.Rc3+=) 23.Rc8+/– Rc8 24.Qa7 b6? (better is 24...Rc2!? 25.Bd4 Qd7+/–) 25.Nd4+– Qd6 (25...Qe5 26.Qb6 Bd8 27.Qb7+–) 26.Nc6 Qc7? (26...Bd8+–) 27.Ne7 Qa7 28.Nc8 Qb8?? (28...Qd7 29.Rc1 Qd8+–) 29.Rc1 g5 (29...Qb7 30.Rc6 d4 31.Bd4+–) 30.Rc6 d4 (30...Kh7 31.Bf6 d4 32.Bd4 h5+–) 31.Bd4 Kh7 32.Bf6 (32.Rf6?! Qc8 33.Bb6 Qc4+–) 32...Qa8 (32...g4 33.hg4 Qb7+–) 33.Ne7 Qd8 34.g4 Qd1 35.Kg2 Qa4 36.Rc8 Qe4 37.Kg3 Qe7 38.Be7 1–0. pman3660 (2290) – decu40 (1930), gameknot.com, 2015.

5.e3 Nbd7 6.Nc3 =.

4.e3 Nbd7

5.Bb2 e6 (--> 1.b4 a5 2.b5 Nf6 3.Nf3 e6 4.Bb2 d5 5.e3 Nbd7).

5.d4 e6 6.c4 Bb4 7.Nbd2 c5 8.Bb2 cd4 9.ed4 b6 10.a3 Be7 11.Ne5 0–0 12.Nc6 Qe8 13.Be2 Bb7 14.0–0 Rc8 15.Ne7 Qe7 16.a4 Rfe8 17.Ba3 Qd8 18.Rc1 dc4 19.Nc4 (worse is 19.Bc4 Nf8+=) 19...Nf8 20.Qd2 Ng6 21.f3 Nd5 22.Rfd1 Nb4 23.g3 Re7 24.Bb4 ab4 25.Qb4 Rec7 26.a5 ba5 27.Qa5 Qg5 28.Qd2 Qd8 29.Kg2 h6 30.Rc3 Ne7 31.Rdc1 Rd7 32.Ne5 Rd4 33.Rc8 Bc8 34.Qc3 Kf8 35.Nc6 Nc6 36.Qc6 Rd2 37.Qc8 Re2 38.Kf1 Rd2 39.b6 Rd1 40.Kf2 Rd2 41.Kf1 Rd1 42.Kg2 Ke7 43.Rc7 Kf6 44.Qd8 Rd8 45.Kf2 Rd3 46.b7+– Rb3 47.Ke2 e5 48.Kd2 Ke6 49.Kc2 Rb6 50.Kc3 Kd5 51.Rf7 g5 52.g4 Rb1 53.Rh7 Rb5 54.Rd7 Kc5 55.Rf7 Kd5 56.Rh7 Kc5 57.Kd3 Kd5 58.Rd7 Kc6 59.Rg7 Kd5 60.h3 Rb2 61.Rc7 Rb3 62.Kc2 Rb6 63.Kc3 Rb1 64.Rg7 Rb6 65.Rc7 Rb1 66.Rh7 Rb6 67.Rf7 Ke6= 68.Rh7 Kd5 69.Rf7 Ke6= 70.Rc7 Kd6 71.Rg7 Kd5 72.Rh7 Kc5 73.Rf7 Kd5 74.Rh7 Kc5 75.Kd3 Kd5 76.Rc7 Rb3 77.Kd2 Rb2 78.Kc1 Rb3 79.Kc2 Rb6 80.Re7 Kd6 81.Rg7 Kd5 82.Kc3 Kc5 83.Kd3 Kd5 84.Rh7 Rb3 85.Kc2 Rb6 86.Kd2 Rb2 87.Kd3 Rb3 88.Kc2 Rb6 89.Rh6! Rb7 90.Rg6 Rf7 91.Rg5 Rf3 92.h4 Rh3 93.h5 Kd4 94.Rg6 Rh2 95.Kd1 e4 96.h6 e3 97.g5 Kd3 ½–½. Buczinski,Henryk (2205) – Kroes,Friso (1910), SA–2010–0–00170, 2010.

4.e3 e6

5.a4 Bd6 6.Bb2 0–0 7.Be2 Nbd7 8.d4 c5 9.Ba3 Ne4 10.c4 Qf6 11.Ra2 Rd8 12.cd5 ed5 13.dc5 Ndc5 14.Qd4 Qg6 15.Nh4 Qg5 16.Bb2 Ne6 17.Nf3 (17.Qd1 Bb4 18.Kf1 Qh4 19.g3–+) 17...Qg2 18.Rg1 Qf2 (19.Kd1 Nd4 20.Bd4 f6–+; 18...Nd4?! 19.Rg2 Bh3 20.Rg7 Kg7 21.Bd4 f6 22.Bd3–+) 0–1. Wolf,Heinz – Wingender,Hans Peter, Ersingen Verbandsliga Nord, 1998.

5.c4 c5 6.Bb2 b6 7.Be2 Bd6 8.0–0 0–0 9.h3 Bb7 10.d3 Nbd7 11.Nbd2 a4 12.a3 Qc7 13.Qc2 h6 14.Rad1 Rfd8 15.Bc3 Ne5 16.Qb2 Nf3 17.Bf3 Qe7 18.cd5 ed5 (18...Bd5? 19.e4 Bb7 20.e5 Be5 21.Be5 Bf3 22.Nf3+– (22.gf3?! Rd3 23.Ne4 Rd1 24.Rd1 Ne4 25.fe4 Rd8 26.Rd8 Qd8+–)) 19.Rfe1 Ra7 20.Be2 Bc8 21.Ra1 Bd7 22.Bf3 Be6 23.Be2 Ne8 (23...Re8 24.Nf3+=) 24.Nf3 f6 25.Nd2 Qf7 26.d4 c4 27.Bf1 (27.Bf3 f5+=) 27...Qg6 28.e4 Rc7 29.ed5 Bd5 30.Rac1 Bf4 (30...Rdc8 31.Nb1+=) 31.Bb4+= Increases the pressure on c4 31...f5 32.Rc2 Nf6 33.Rc4 (33.Nc4 Rdc8 34.Ne3 Rc2 35.Nc2 Ne4=) 33...Bc4+= 34.Nc4 Ne4 35.Ne5 Be5 36.de5 Qe6 37.f3 Ng3 38.Bd6 Nf1 (38...Rd6 39.ed6 Qd6 40.Be2+=) 39.Rf1 (39.Bc7 Rd2 40.Qb1+=) 39...Rc4+= 40.Kh2 (40.Qf2 Rd6 41.ed6 Qd6+=) 40...Rdc8–/+ 41.Rf2 (41.Qf2 Rc2 42.Qb6 Qc4–+) 41...Rc1 42.Qd4 Rb1 43.Bc7 (43.g4 Rcc1 44.Rd2 Qb3–+) 43...Qf7 44.Rc2 (44.Bb6 Rcc1 45.Qd8 Kh7–+) 44...Rb5–+ 45.Qa4 Ra5 46.Qf4 Ra7 (46...Rc7?! 47.e6 Rc2 48.ef7 Kf7 49.Qd4=) 47.e6 Qe6 48.Bb6 Rc2 49.Ba7 Qg6 50.Qb8 Kh7 51.Qg3 Qg3 52.Kg3 Rc3 53.Kf4 Ra3 54.Bb8 g6 55.h4 (55.Bd6 Ra5–+) 55...Ra4 56.Kg3 Kg7 57.Bf4 h5 58.Bg5 Ra2 59.Kh3 Kf7 0–1. bla_ner (1905) – forsetinn (2415), gameknot.com, 2015.

5.Be2 c5 6.0–0 Bd6 7.Bb2 0–0 8.c4 Nbd7 9.d4 b6 10.Nbd2 Bb7 (--> 1.b4 d5 2.Bb2 Nf6 3.e3 e6 4.b5 c5 5.Nf3 Bd6 6.c4 Nbd7 7.Be2 0–0 8.0–0 b6 9.d4 Bb7 10.Nbd2 a5).

4.e3 Bg4

5.c4 e6 6.h3 Bh5 7.cd5 Nd5 8.Bb2 a4 (8...Nd7 9.Nc3+=) 9.a3 (9.Na3 Nd7+=) 9...Nd7= 10.Be2 (10.Nc3 Nc3 11.Bc3 Nc5=) 10...Nc5 11.0–0 1–0. cachisss (1920) – manijer_wmp3 (2135), gameknot.com, 2015.

5.h3 Bf3 6.Qf3 Nbd7 7.Be2 =.

5.h3 Bh5 6.c4 (6.Ba3 Nbd7=) 6...e6= 7.cd5 ed5 8.Be2 Bd6 9.Nc3 Nbd7 10.0–0 0–0 11.Bb2 Re8 12.Rc1 Nc5 Black intends a4 13.Na4 Nfe4 14.Nc5 Nc5 15.d3 Bg6 16.Be5 a4 (16...Ne6 17.Qc2=) 17.Bd6 Qd6 18.d4 Ne4 (18...Ne6 19.Nh4=) 19.Nh4 Re7 20.Bd3 Nf6 (20...Qe6 21.Ng6 hg6 22.Be4 Qe4 23.Qd2+=) 21.Ng6+= hg6 (21...fg6 22.Rc3+=) 22.Rc3 Nd7 (22...Ra5 23.Qc2+=) 23.Qc2+/– Nf8 24.Rc1 Ne6 25.h4 (25.Be2 Ree8+=) 25...a3 (25...Ra5 26.Be2+=) 26.Bf1 Ra5 27.Qd3 Ra4 (27...Kh7 28.g3+/–) 28.g3 Ra7 (28...Ra5 29.Bh3+/–) 29.Bh3 Nd8 (29...f5 30.Rb3+/–) 30.Rb3 (30.Rb1 Ne6+/–) 30...Ra8 (better is 30...Ne6+/–) 31.Rc6?? (better is 31.Rcc3+/–) 31...bc6–+ 32.Qb1 (32.bc6 Nc6 33.Bg4 Ree8–+) 32...Rb8 33.Qc1 (33.Qd3 cb5 34.Ra3 Ne6–+) 33...cb5 34.Ra3 (34.Qa3 b4 35.Qb2 Re8–+) 34...Nb7 35.Bf1 Qb6 36.Rc3 (36.Bg2 c6–+) 36...Na5 37.Be2 (37.Rc5 c6–+) 37...Nc4 38.Bd3 (38.Rb3 Ra8 39.a3 Qa5–+) 38...Ra8 39.Bb1 (39.Rc2 Qd6–+) 39...Qe6 40.Qd1 (40.Rb3 c6–+) 40...Qh3 41.Qf3 c6 42.Rd3 (42.Qe2 Ra4 43.Rb3 Re6–+) 42...Re4 43.Qe2 Rg4 44.a3 (44.Rc3 Re8 45.Rd3 f5–+) 44...Qh4 45.Bc2 (45.Rc3 Rg5 46.Kg2 Qh6–+) 45...Rg5 46.Qf3 (46.Bd1 Qe4 47.Qc2 Ra6–+) 46...Na3 47.Bb3 Nc4 48.Rd1 Ra3 (48...Ra3 49.Bc4 bc4–+) 0–1. bla_ner (2015) – decu40 (1935), gameknot.com, 2015.

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

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