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Section 0: General Overview
Section I: 1.e4 e5 2.f4 exf4 3.Nf3 d6 4.d4 g5 5.h4 g4 6.Ng1
A 6...Qf6 B 6...Bh6 C 6...other
Section II: Perhaps best play 1.e4 e5 2.f4 exf4 3.Nf3
A 3...g5 B 3...Nf6
Section III: Only equality at best 1.e4 e5 2.f4 exf4 3.Nf3
A 3...Be7 B 3...d5 C 3...h6 D 3...Ne7 E 3...Nc6
Section IV: 1.e4 e5 2.f4 exf4 3.other than Nf3
A 3.Bc4 B 3.Nc3 C 3.Be2
Section V: 1.e4 e5 2.f4 other
A 2...d5 B 2...Bc5
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Section 0: General Overview
Here is a simple yet time-intensive study which indicates a possible main line for the King's gambit:
1.e4 e5 2.f4 exf4 3.Nf3
Stockfish_20090822_x64_modern:
72/104 1929:52:09 -0.40 3...Nf6 4.Nc3 and now 652 hours -0.18/89 SF201102 4...d5 5.exd5 Nxd5 6.Bb5+ c6 7.Qe2+ Be6 8.Nxd5 Qxd5 9.Ba4 Be7 (Qd8!? Na6!?) 10.Bb3 Qd6 11.d4 Bxb3 12.axb3 Nd7 13.0-0 Nf8 14.c3 Ng6 15.Ne5 Nxe5 16.Bxf4 Qe6 this line is my current best guess at the critical line in the King's gambit, if the 3...d6 line turns out to be drawn.
A. 4.e5 Nh5 5.d4 (next best choices: -0.60/76 5.Be2 g5 6.Nc3 d5 7.Nxg5 Qxg5 8.Bxh5 Qh4+ 9.Kf1 Be6; -0.62/76 5.Qe2 Be7 6.d4 0-0 7.Nc3 d6 8.Bd2 Bg4 9.0-0-0 Nd7) now Stockfish_20092110_x64_modern
1. 81/96 1222:21:53 -0.29 5...g6 6.Be2 d6 7.0-0 Nc6 8.Nc3 Bg7 9.exd6 cxd6 10.Nd5 g5 11.c3 Be6 12.Nxf4 Nxf4 13.Bxf4 gxf4 14.d5 0-0 15.Kh1 Ne5 16.dxe6 fxe6 17.Nxe5 Bxe5 18.Bc4 Rf6 19.Qg4+ Kf7 20.Qh3
2. 73/100 299:26:46 -0.25 5...d5 6.c4 g5 7.g4 dxc4 8.Bxc4 Ng7 9.Nc3 Bxg4 10.h3 Bh5 11.h4 Nc6 12.Nd5 Be7 13.hxg5 Bg4 14.Bxf4 Qd7 15.Ne3 0-0-0
B. -0.62/72 4.d3 d5 5.Bxf4 Nc6 6.Nc3 Bb4 7.exd5 Nxd5 8.Bd2 Bxc3 9.bxc3 0-0 10.Be2 Qe7 11.c4 Nf6 12.Bc3 Re8 13.Bxf6 Qxf6 14.0-0
72/99 1929:52:09 -0.15 3. ... h6 4.d4 g5 5.h4 Bg7 6.hxg5 hxg5 7.Rxh8 Bxh8 8.g3 d5 9.Nc3 Bg4 10.Nxd5 Ne7 11.gxf4 Nxd5 12.exd5 Qxd5 13.Bg2 Nc6 worth more exploring in depth
72/100 1396:37:50 -0.32 3...d6 4.d4 g5 5.g3 (5.h4 likely draws, see Section I below) h6 6.Nc3 fxg3 7.hxg3 Bg7 8.Be3 Nf6 9.Qd2 Ng4 10.0-0-0 Nd7 11.Bg1 Nb6 12.Be2 d5 13.Ne5 Nf6
72/103 1929:52:09 -0.15 3. ... g5 4.h4 g4 5.Ne5 d6 6.Nxg4 Be7 7.d4 Bxh4+ 8.Nf2 Bg3 9.Qf3 Nc6 10.Bxf4 Bxf4 11.Qxf4 Nxd4 12.Qd2 Ne6 13.Nc3 Qg5
Note that 3.Nf3 is likely best, next best: SF201104
65/92 71:09:43 -0.58 3.Bc4 Nc6 4.d4 Nf6 5.Nc3 Bb4 6.Nge2 f3 7.gxf3 d5 8.exd5 Nxd5 9.0-0 Nxc3 10.bxc3 Bd6 11.Ng3 0-0 12.f4 Be6 13.Qd3 Bxc4
65/90 71:09:43 -1.00 3.Qf3 Nc6 4.Qxf4 Bd6 5.Qe3 Nf6 6.d4 0-0 7.Bd3 Bb4+ 8.c3 d5 9.e5 Ng4 10.Qd2 f6 11.h3 Nh6 12.exf6 Qxf6 13.Nf3 Re8+
3.Be2 f5!
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Section I: 1.e4 e5 2.f4 exf4 3.Nf3 d6 4.d4 g5 5.h4 g4 6.Ng1
4.d4 g5 5.h4
5.Nc3!? g4* 6.Bxf4 gxf3 7.Qxf3
a) -0.57/51 7...Nc6 8.Bb5 Bd7 9.0-0-0 Qh4 10.Kb1 0-0-0 11.d5 Nb8 12.Rd4 Qe7 13.Rc4 Bg7
b) -0.31/51 7...Bg7 8.Bb5+ c6 9.Bc4 Qh4+ 10.g3 Qg4 11.Qf2 b5 12.Bb3 Qg6 13.Bxd6 a5
c) +0.00/51 7...Qh4+ 8.g3 Qg4 9.Qe3 Ne7 10.Be2 Qg6 11.0-0 c6 12.Bd3 Bg7 13.e5 Nf5
*5...Bg7 declining the piece sacrifice -0.15/56 6.g3 Nc6 7.d5 Ne5 8.gxf4 gxf4 9.Bxf4 Bg4 10.Bb5+ Kf8 11.Be2 Nxf3+ 12.Bxf3 Qf6 13.Bxd6+ cxd6 14.Bxg4 Qh4+ 15.Kd2 Ne7 16.Kc1 h5
5...g4 6.Ng1 is an interesting line where Black's moves 4...g5 and 5...g4 are best play and other black moves favor White. My own analysis below shows that 6...Qf6 causes the most problems for white in this line, but ultimately is even in this long and deep analysis effort taking many hundreds of hours of computer time:
Newer analysis: 7 July 2018 (over 1090 hours) Stockfish_18051623_x64_modern
70/108 1090:52:31 -0.18 6...Qf6 7.Nc3 Ne7 8.Nge2 Bh6 9.Qd2 Nbc6 10.Nb5 Kd8 11.d5 a6 12.Nbc3 Ne5 13.Nxf4 g3 14.Qe3 N7g6 15.Nce2 Nxf4 16.Nxf4 Rg8 17.Nh5 Bxe3 18.Nxf6 Bxc1 19.Rxc1 Rg6 20.Nh5 Bg4
Stockfish_18011309_x64_modern was initially used to guide analysis below but subsequent analysis has used the current development build, indicated by the yymmdd date in the program name:
A 70/108 -0.18 6...Qf6 7.Nc3 Ne7 note that this small black advantage is not sustained in the analysis that follows: the mainline is in bold
- 7...c6 8.Nge2 Bh6 9.e5 transposes to B2 below: 6...Bh6 7.Nc3 0.00/62 7...c6 8.Nge2 Qf6 9.e5 dxe5 10.Ne4 Qg6;
- 7...Be6 -0.09/66 8.d5 Bd7 9.Qd2 Bh6 10.Qf2 and now a) +0.00/64 10...Na6 11.Bxa6 bxa6 12.Bd2 Ne7 13.Nge2 f3 14.Bxh6 Qxh6 15.gxf3 gxf3 16.Qxf3 Rg8 b) +0.00/64 10...a6 11.Nge2 f3 12.Bxh6 Qxh6 13.gxf3 gxf3 14.Qxf3 Nf6 15.e5! dxe5 16.Ne4 c) +0.00/64 10...g3 11.Qf3 Ne7 12.Nge2 Ng6 13.Nxg3 Ne5 14.Qf2 Bg4 15.Nf5 Bxf5 16.exf5 Qxf5 d) +0.00/62 10...Bc8 11.Nge2 f3 12.Bxh6 Nxh6 13.0-0-0 Nd7 14.Ng3 Ne5 15.Nb5 Qe7 16.Kb1 a6
- 7...Bg7 8.Nd5 Qd8 9.Bxf4 favors white
8.Nge2 Bh6
8...f3 avoids prepared lines after 8...Bh6 9.g3 below and complicates things for white, who can choose among the following playable lines:
- 9.Nf4 and now white can choose to fight for an advantage that might eventually evaporate after the complicated 9...Nbc6
a) +0.87/65 9.Nf4 Bd7 10.gxf3 gxf3 11.Qxf3 Nbc6 12.e5 Qf5 13.Be3 Qg4 14.Qf2 Nf5 15.Ne4 Be7 16.exd6 cxd6 17.h5 Nxe3 18.Qxe3 0-0-0 19.Bh3 Qg7 20.Bxd7+ Rxd7 21.0-0-0 d5 22.h6 Qf8
b1) +0.76/57 9...Nbc6 10.Nfd5 (or +0.31/48 10.Be3 f2+ 11.Kxf2 Bh6 12.g3 Bd7 13.Be2 Bxf4 14.gxf4 g3+ 15.Kxg3 d5 16.Kf2 0-0-0) Nxd5 11.Nxd5 Qxd4 12.Qxd4 Nxd4 13.Nxc7+ Kd8 14.Nxa8 Nxc2+ 15.Kf2 Nxa1 is complicated now at +0.51/58 16. Bd3 Be7 17.Be3 b6 18.Rc1 Bxh4+ 19.g3 Bf6 20.Rc7 h5 21.Rxa7 Nc2 22.Bxb6+ Ke8 23.Nc7+ Kf8 24.Nd5 Bd4+ 25.Bxd4 Nxd4 +0.45/53 26.Nf4 Kg7 27.Bc4 Rf8 28.Nxh5+ Kg6 29.Nf4+ Kf6 30.Ra8 Rh8 white might want to try instead the bail-out lines 2. and 3. below
b2) +0.70/68 9.Nf4 Nbc6 10.Nfd5 f2+ 11.Ke2 Nxd4+ 12.Kd3 Qg7 13.Nxc7+ Kd8 14.Nxa8 Qe5 15.Qd2 g3 16.Qf4 Bg7 17.Qxe5 Bxe5 18.Be3 Ndc6 19.Kd2 Bg4 20.Nd5 Nxd5 21.exd5
c) 9...fxg2 10.Bxg2 with advantage to white
d) +1.03/56 9...f2+ 10.Kxf2 Nbc6 11.Nb5 g3+ 12.Kg1 Bh6 13.Qd2 Kd8 14.e5 Qxf4 15.Qxf4 Bxf4 (Stockfish_18070710_x64_modern)
-
+0.00/68 9.gxf3 gxf3 10.Nf4 Bg4 11.Kf2 Bg7 12.Ncd5 Nxd5 13.Nxd5 Qxd4+ 14.Be3 Qxd1 15.Rxd1 Kd7 16.Rg1 h5 17.Bh3 Bxh3 18.Rxg7 Be6 19.Rdg1 Na6 20.Nf6+ Kc6
-
+0.00/68 9.Ng3 Bh6 10.Bxh6 Qxh6 11.gxf3 Qe3+ 12.Be2 gxf3 13.Qd3 Qxd3 14.Bxd3 Nbc6 15.Nb5 Kd8 16.c3 Rf8 17.Kf2 f5 18.exf5 Nxf5 19.Nxf5 Bxf5 20.Bxf5 Rxf5
9.Qd2
9.g3 has been previously played, but the prospects are judged to be potentially less than those for the main line, although complications suggest that prepared lines have a certain playability here (Stockfish_18070710_x64_modern):
A) 9...f3 and now 1) -1.23/63 9...f3 10.Nf4 Nbc6 11.Bb5 Qg7 12.Ncd5 Nxd5 13.exd5 a6 14.Bxc6+ bxc6 15.dxc6 0-0 16.0-0 Bxf4 17.Bxf4 Bf5 18.Re1 Rfe8 19.Qd2 Be4 20.Re3 Qg6 21.Rae1 Bxc6 22.Rxe8+ Rxe8 23.Rxe8+ Bxe8 24.Kf2 f6 25.Qd3 Qxd3 26.cxd3 Bb5 2a) -1.20/61 10.Bxh6 Qxh6 11.Nf4 Bd7 12.Ncd5 Nxd5 13.exd5 0-0 14.Bd3 Bc8 15.Kf2 Nd7 16.Re1 Nf6 2b) -0.46/60 10.Bxh6 f2+ 11.Kd2 Qxh6+ 12.Nf4 Nbc6 13.Ke2 Bd7 14.Qd2 f5 15.Bg2 0-0-0 16.Kxf2 fxe4 2c) 10.Bxh6 fxe2 11.Qd2 +0.29/43 11...Qf3 12.Qxe2 Qxh1 13.Nd5 b6 14.Nxc7+ Kd8 15.Nxa8 Bb7 16.d5 Bxa8 17.0-0-0
B) -1.07/63 9...fxg3 10.Bxh6* Qxh6 11.Qd2 Qxd2+ 12.Kxd2 Nbc6 13.Nb5 Kd8 14.Bg2 Bd7 15.Raf1 f5 16.c4 Rb8 17.Nbc3 h5 18.b3 fxe4 19.Bxe4 g2 20.Bxg2 Nf5 21.Bxc6 bxc6 22.Ne4 Ke7 23.N4g3 Rbf8 24.Nxf5+ Bxf5 25.Rf4 Bg6 26.Re1 Kd7
*10.Nxg3 Bxc1 11.Rxc1 now -1.28/53 11...Nbc6 (11...Bd7 12.Bb5 Nbc6 transposes) 12.Bb5 Bd7 13.Bxc6 Bxc6 14.Qd3 0-0 15.h5 Rae8
9...Nbc6
- +0.00/54 9...Bd7 10.Nxf4 Nbc6 11.d5 Nd4 12.Kd1 Qe5 13.Qf2 g3 14.Qxg3 now +0.00/54 14...0-0-0 15.Nfe2 Bxc1 16.Qxe5 dxe5 17.Kxc1 f5 18.b3 fxe4 19.Kb2 e3 20.Rd1 c5
- +0.00/54 9...0-0 10.Nxf4 Nbc6 11.Nce2 Ng6 12.c3 Nxf4 13.Nxf4 Re8 14.Kd1 Qxf4 15.Qxf4 Bxf4 16.Bxf4 Rxe4 17.Bd2
- +0.00/43 9...Be6 10.Nxf4 Ng6 11.g3 Nxf4 12.gxf4 Nc6 13.Nb5 0-0 14.d5 Ne5 15.Be2 a6
- +0.00/33 9...g3 10.Nxf4 Nbc6 11.Bb5 Bd7 12.Bxc6 Bxc6 13.d5 Ng6 14.dxc6 Bxf4
10.Nb5 Kd8
- a) 10...Kd7 11.Nbc3 +0.00/61 11...Re8 12.g3 (12.d5 Ne5 13.Nxf4 N7g6 14.Bb5+ c6 15.dxc6+ bxc6 16.Ncd5 Qd8 17.Be2 Nxh4 18.Kf1 Bg5) 12...b5 13.e5 f3 14.Qxh6 Qxh6 15.Bxh6 Nf5 16.Bf4 fxe2 17.Nxe2
b) +0.00/53 10...Kd7 11.Nbc3 Rg8 (11...Ke8 12.Nb5 with transposition or repetition) 12.g3 fxg3 13.Qxh6 Qf2+ 14.Kd1 g2 15.Bxg2 Qxg2 16.Rg1 Qf3;
- a) +0.00/65 10...0-0 11.Nxc7 Rb8 12.Nxf4 Nxd4 13.c3 Bxf4 14.Qxf4 Nc2+ 15.Ke2 Qxf4 16.Bxf4 Nxa1 17.Bxd6 Nf5 18.exf5 Rd8
b) +0.00/66 10...0-0 11.Nxc7 Rb8 12.Nxf4 Nxd4 13.c3 Ne6 (13...Qxf4 =) 14.Ncxe6 fxe6 (14...Bxe6 =) 15.Qxd6 Bxf4 16.Bxf4 Qxf4 17.Qxe7 and now Qf2+, Qg3+ and h6 each are +0.00/53.
c) +0.00/64 10...0-0 11.Nxc7 Rb8 Bf5 12.exf5 Rc8 13.Kd1 Rxc7 14.Nxf4 Qxd4 15.Qxd4 Nxd4 16.f6
11.d5
11.e5 Qf5 12.exd6 Nd5 is complicated but favors black.
This is as far as my database of games shows that is known to date, in games played by Joseph Gallagher.
Perhaps the following is new theory... and now:
-0.21/57 11...a6
11...Ne5 +0.00/52 12.Qa5 b6 13.Qc3 c5 14.dxc6 a6 15.Nxd6!? (perhaps 15.Nbd4 as in +0.00/66 13...c5 14.dxc6 a6 15.Nbd4 Kc7 16.g3 fxg3 17.Bxh6 Qxh6 18.Bg2 Re8 19.Rd1 Be6 20.Nxg3 Rac8 21.0-0) N7xc6 16.Nc4 Be6 17.Nxe5 Nxe5 18.Qd2+ Kc7 19.Nxf4 Kb7 20.Qf2 this line might need more work
11...Qe5? 12.Nbc3 favors white
12.Nbc3 Ne5
12...Nb4 13.Kd1 favors white
13.Nxf4 g3
On 13...Rf8 or 13...Re8 there is 14.Qf2. On 13...Bd7 14.Ne6+ is also equal.
14.Qe3
a) -1.11/45 14.h5 Rg8 15.Be2 Bg4 and
b) -0.68/45 14.Nce2 Rg8 15.Qd4 Bg4 favor black
14...N7g6
a) 14...N5g6
- 15.Nce2 Nxf4 16.Nxf4 Ng6 transposes to the main line (if 16...Nf5 17.Qc3), while a) +0.00/57 15...Bg4 16.Qxg3 Bxe2 17.Nxe2 Bxc1 18.Rxc1 Qxb2 19.Qb3 Qxb3; b) +0.00/57 15...Rg8 16.Nh5 Qxb2 17.Bxb2 Bxe3 18.Nexg3 Ne5 19.Bxe5 dxe5; c) +0.00/57 15...Nf5 16.Qc3 Qxc3+ 17.bxc3 Nxf4 18.Nxf4 Bg7 19.Bd2 Ne3; d) +0.00/57 15...Re8 16.Nh5 Qxb2 17.Bxb2 Bxe3 18.Rb1 f5 19.Nexg3 f4 should all hold even for White.
- 15.Nh5 Bxe3 16.Nxf6 is almost playable, for example a) -0.20/59 16...Bf2+ 17.Kd1 Bd4 18.Nh5 b5 19.Be2 b4 20.Nb1 f5 21.Nxg3 fxe4 22.Nxe4 b) -0.08/59 16...Bd4 17.Nh5 Bf2+ 18.Kd1 f5 19.Bh6 fxe4 20.Nxe4 Bg4+ 21.Be2 Bxe2+ 22.Kxe2
b) 14...Bg4 15.Nce2 is equal
15.Nce2 Nxf4
15...Re8 +0.00/60 16.Qxg3 Nxf4 17.Nxf4 Ng6 18.Ne6+ Bxe6 19.Bxh6 Qxb2 20.Rd1 Qb4+ 21.Kf2 Bd7 22.Bd3 Ne5 23.Rhe1 Kc8 24.Kg1 b6 25.Bf4 Ng4 Stockfish_18091012_x64_modern
16.Nxf4 Ng6 is now scoring -0.09/72... alternatives:
a1) +0.00/71 16...Rg8 17.Nh5 Bxe3 18.Nxf6 Bf2+ 19.Kd1 Rg6 20.Nxh7 Ke7 21.Ng5 f6 22.Nh3 Bxh3 23.Rxh3
a2) +0.00/70 16...Rg8 17.Nh5 Bxe3 18.Nxf6 Bxc1 19.Rxc1 Rg6 (19...Rg7 20.Be2 is equal) 20.Nh5 now with no better alternatives for black at moves 17, 18 or 19 we have: +0.00/71 20...Bg4 21.Be2 Bxh5 22.Bxh5 Rh6 23.Be2 Rf6 24.Rh3 Rf4 25.Rxg3 Kd7 26.Re3 Rxh4 27.Kf2 Rh8 28.g3 Rh2+ 29.Kg1 Rh6 Stockfish_18091012_x64_modern
b) +0.00/71 16...Bg4 17.Qxg3 Ke7 18.Qf2 Rhg8 19.Nd3 Qg6 20.Bxh6 Qxh6 21.Nxe5 dxe5 22.Qd2 Qxd2+ 23.Kxd2 Bd7 24.Re1 Rg3 Stockfish_18091012_x64_modern
17.Nh5 Bxe3
a) 17...Qf2+ 18.Qxf2 gxf2+ 19.Kxf2 Bxc1 20.Rxc1 favors white;
b) 17...Qxb2 18.Bxb2 Bxe3 19.Bf6+ Ke8 20.Bxh8 favors white
18.Nxf6 Bd4
a) +0.00/55 18...Bxc1 19.Rxc1 Ke7 20.Nh5 Ne5 21.Nxg3 Rg8 22.Kf2 Ng4+ 23.Kg1 Ne5
b) +0.00/55 18...Bf2+ 19.Kd1 Ke7 20.Bg5 Bd4 21.Ng8+ Ke8 22.Nf6+
19.Nh5 Bf2+
a) +0.00/46 19...Be5 20.Bg5+ Ke8 21.Be2 Bxb2 22.Rb1 Bc3+ 23.Bd2 Bxd2+ 24.Kxd5 Ne5
c) +0.00/46 19...Ne7 20.a4 Bf2+ 21.Kd1 f5 22.Ra3 fxe4 23.Be2 Nxd5 24.Nxg3 Bc5 25.Rb3 e3
b) +0.16/46 19...Bg4 20.Be2 Bf2+ 21.Kd1 Bxh5 22.Bxh5 Ne5 23.Bf4 c6 24.dxc6 bxc6 25.Bxe5 dxe5 26.Ke2
d) +0.22/42 19...c5 20.Nxg3 Be5 21.Nf5 Bxf5 22.exf5 Ne7 23.g4 h5
20.Kd1 f5
a) +0.00/45 20...Ne7 21.Be2 f5 22.a4 fxe4 23.Ra3 Bd7 24.Nxg3 Bc5
b) +0.01/45 20...c6 21.Bg5+ Kc7 22.Nf6 h6 23.Bd2 Bd4 24.Bc3 Bxf6
c) +0.14/45 20...c5 21.Be2 f5 22.a4 Kc7 23.Ra3 fxe4 24.Nxg3 e3
and now: -0.08/53 21.Bg5+ Ne7 22.exf5 Bxf5 23.a4! now lines 1-4 below are critical to this line holding together:
- a) -0.08/72 23...Kd7 24.Nf6+ Kd8 25.Nh5 allows repetition, but the computer line continued 25...h6 26.Bd2 Bg4+ 27.Be2 Bxe2+ 28.Kxe2 Nxd5 29.Ra3 Re8+ 30.Kd1 Re5 31.Nxg3 Kd7 white is holding even into the endgame b) 23...Kd7 24.Nf6+ Kc8 25.Ra3 h6 26.Bc1 Bd4 (26....Rf8 27.Nh5 +0.00/67 27...Bg4+ 28.Be2) 27.Nh5 and now 27...Nxd5, 27...Bg4+, 27...Be5 and 27...Kd7 are all met by 28.Be2 and are all +0.00/63.
- -0.08/62 23...h6 24.Bd2 (now scoring -0.08/73 see line 3 below) Nxd5 25.Ra3 Bg4+ 26.Be2 Bxe2+ 27.Kxe2 Re8+ 28.Kd1 (now scoring -0.08/55) Re5 29.Nxg3 Kd7 30.Rf1 Be3 31.Nf5 Bxd2 32.Kxd2 Rg8 33.g3 h5 34.Rd3 Rge8 35.Nd4 R8e7 36.Nf5 Rf7 37.Rdf3 Nf6 38.Rf4 Ne4+ 39.Kc1 Re8 40.g4 hxg4 41.Rxg4 Nc5 Stockfish_18070710_64_modern
- 23...h6 24.Bd2 -0.08/73 24...Nxd5 25.Ra3 Kd7 26.Be2 Raf8 27.Nxg3 Be6 28.Ne4 Bd4 29.Rf3 Rxf3 30.Bxf3 b5
- -0.08/54 23...Bg6 24.Nf4 Bf5 25.Nh5 allows repetition, and as in 1a above transposes into line 2 above: 25...h6 26.Bd2 Bg4+ 27.Be2 Bxe2+ 28.Kxe2 Nxd5 29.Ra3 Re8+ 30.Kd1 Re5 31.Nxg3 Kd7 32.Rf1 Be3 33.Nf5 Bxd2 34.Kxd2 Rg8 35.g3 h5 Stockfish_18071408_x64_modern
- other moves yield no lasting pressure: 23...Be4 24.c4; 23...Rf8 24.Ra3; 23...Bg4+ 24.Be2; 23...Kc8!? 24.Bxe7 Re8 25.Ra3; 23...Bd7 24.Be2
B 6...Bh6 (Fischer in the above paper claims that white "gets no compensation" after this move but Stockfish 'thinks' otherwise)
7.Nc3
(7.Ne2 does not appear to be best, for example: a. -0.37/57 7...Qf6 8.Nbc3 Be6 9.d5 Bd7 10.Qd4 Qxd4 11.Nxd4 Bg7 12.Ndb5 Kd8 13.Bxf4 a6 14.Na3 b5 15.Nd1 h6 b. -0.47/58 7...Qf6 8.Nbc3 f3 9.Ng3 Nc6 10.Bxh6 Qxh6 11.Nd5 Nce7 12.gxf3 (no time for 12.Nxc7+ Kd8 13.Nxa8 - black is threatening Qe3+) Nxd5 13.exd5 Kf8 14.Qc1 Qxc1)
and now:
[new data 28 July 2018 Stockfish_18071408_x64_modern]
- 0.00/62 7...Be6 8.Bb5+ c6 9.Bd3 Qf6 10.d5 Bc8 11.Be2 Ne7 12.Bxg4 Bxg4 13.Qxg4 Rg8 14.Qe2 cxd5 15.Nf3 Nd7 16.Bd2 dxe4 17.Nxe4 Qxb2 18.0-0 Qb6+ 19.Kh1 Rg6 20.Rab1 Qa6
- 0.00/62 7...c6 8.Nge2 Qf6 9.e5 dxe5 10.Ne4 Qg6 11.N2c3 f5 12.Ng5 Qd6 13.dxe5 Qxd1+ 14.Kxd1 Ne7 15.Bc4 Bxg5 16.hxg5 b5 17.Bb3 Ng6 18.Ne2 f3 19.gxf3 Bb7 20.Be6 c5
- 0.00/62 7...Nc6 8.Nge2 f3 9.Nf4 Nf6 10.Nfd5 Nxd5 11.Nxd5 Bxc1 12.Qxc1 Nxd4 13.Qd2 fxg2 14.Bxg2 Nc6 15.Rf1 Be6 16.Nf6+ Ke7 17.e5 Nxe5 18.0-0-0 h6 19.Bxb7 Rb8 20.Bd5 Bxd5
- +0.26/62 7...Bd7 8.Nge2 f3 9.Nf4 Nc6 10.Be3 Bxf4 11.Bxf4 Qf6 12.Nd5 Qg6 13.gxf3 0-0-0 14.Qd2 gxf3 15.0-0-0 Qxe4 16.Nc3 Qf5 17.d5 Ne5 18.Bh3 Qf6 19.Bg5 Qg7 20.Bxd8 Kxd8
- +0.40/41 7...Nf6 8.Nge2 Nh5 9.Nd5 0-0 10.Ndxf4 Bxf4 11.Bxf4 Re8 12.Qd2 Rxe4 13.0-0-0
[older data]
- +0.00/59 7...c6 8.Nge2 Qf6 9.e5 dxe5 10.Ne4 Qd8 (a.10...Qg6 11.N2c3 f5 12.h5 Qe6 13.Bc4! Qd7 14.Bxg8 b. 10...Qe6 11.dxe5 Nd7 12.Qd4 Qxe5 13.Qxe5+ Nxe5 14.Bxf4 Bxf4 15.Nxf4) 11.dxe5 Qxd1+ 12.Kxd1 Nd7 13.Bxf4 Bxf4 14.Nxf4 Nxe5 15.Kd2;
- +0.00/59 7...Be6 8.Bb5+ c6 9.d5 Bc8 10.dxc6 bxc6 11.Nge2 f3 12.gxf3 Bxc1 13.Nxc1 cxb5 14.Qd5 Qb6 15.Qxa8
- +0.00/59 7...Nc6 8.Nge2 f3 9.Nf4 Nf6 10.Nfd5 Bxc1 11.Qxc1 Nxd4 12.Qd2 Nc6 13.gxf3 gxf3 14.Qf4 f2+ 15.Kd2 Nxd5;
- +0.22/58 7...Bd7 8.Nge2 f3 9.Ng3 Qf6 10.gxf3 gxf3 11.Kf2 Qg7 12.Nd5 Bxc1 13.Rxc1 Nf6 14.c3 Rg8 15.Nxf6+ Qxf6
C other moves after 3...d6 4.d4 g5 5.h4 g4 6.Ng1 apparently cause few problems for white:
- +0.00/68 6...Nf6 7.Bxf4 Nh5 8.Ne2 Nc6 9.Nbc3 Nxf4 10.Nxf4 Bg7 11.Qd2 Nxd4 12.Nh5 Be5 13.Nd5 Be6 14.0-0-0;
- +0.00/68 6...Bg7 7.Nc3 Nc6 8.d5 Ne5 9.Bxf4 Ne7 10.Qd2 0-0 11.0-0-0 f5 12.Nge2 Nc4 13.Qd3 Ne5;
- +0.25/68 6...Nc6 7.Bxf4 Nf6 8.d5 Ne5 9.Nc3 Bd7 10.h5 g3 11.Qd2 Nfg4 12.Nh3 Qf6 13.Nb5 Rc8 14.Nxa7 Rd8;
- +0.35/67 6...f3 7.Bg5 f2+ 8.Kxf2 f6 9.Bf4 f5 10.Nc3 fxe4 11.fxe4 d5 12.Ng3 Bd6 13.N1e2 Qf6 14.Qd2 Ne7;
- +0.37/62 6...f5 7.Bxf4 fxe4 8.Bc4 Ne7 9.Ne2 d5 10.Bb3 Bg7 11.0-0 c6 12.c4 0-0 13.Nbc3 Be6;
- +0.25/49 6...d5 7.Nc3 Nf6 8.Bxf4 Nxe4 9.Nxe4 dxe4 10.Ne2 f5 11.Qd2 Nd7 12.Nc3 Bd6
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Section II: Perhaps best play 1.e4 e5 2.f4 exf4 3.Nf3
...If not 3...d6 then what else? 3...g5 and 3...Nf6 are serious contenders for best play.
A1 3...g5 -0.27/66 4.d4 g4 (4...Bg7 -0.21/59 5.Nc3 d6 6.g3 Nc6 7.d5 Ne5 8.gxf4 gxf4 9.Bxf4 Bg4) 5.Ne5 Qh4+ 6.g3 fxg3 7.Qxg4 Qxg4 (7...g2+ 8.Qxh4 gxh1Q 9.Nc3 is 0.00 on deep run) 8.Nxg4 Nc6 9.c3 gxh2 10.Nxh2 h5 11.Be3 Nce7 12.Nd2 d5 13.Bd3 Nf6 14.e5 Ng4 15.Nxg4 is complicated
...other fourth moves for White have problems of their own, as in these alternate lines which need more work:
A2 -0.15/63 4.h4 g4* 5.Ne5 now -0.23/60 d6 (Fischer would play 5...Nf6 but 6.Nxg4 is now -0.08/57 6...Nc6 7.Nc3 Nd4 8.Nxf6+ Qxf6 9.d3 c6 10.Ne2 Ne6 11.c3 Rg8 12.Bd2 Be7 13.Qc2 d5 but needs more work) 6.Nxg4 Nc6 7.Nc3 Be7 8.Nf2 Bxh4 9.d4 Qg5 10.Bb5 Bxf2+ 11.Kxf2 Bd7 12.Bxc6 Bxc6 13.Qf3; *on 4.h4 d5 there is +0.00/58 5.d4 dxe4 6.Nxg5 Nf6 7.Nc3 Bb4 8.Bxf4 h6 9.Bc4 hxg5 10.Bxg5 Be7 11.0-0 Nc6 12.Qd2 0-0 13.Rad1 **not -0.20/56 4.h4 d5 5.exd5 g4 6.Ne5 Qe7 7.Qe2 Nf6 8.d4 Nh5 9.Nd3 Bf5 10.Nc3 Nd7 11.Bd2 Ng3 12.Qxe7+ Bxe7 13.Rg1 Nxf1 14.Bxf4 Bxh4+ 15.Kxf1 0-0-0 16.g3 Bf6 17.Ne5 Rde8 18.Re1 Bxc2 19.Kg2 Bg6 20.Nb5 Bxe5 21.dxe5 a6 22.Nxc7 Kxc7 23.e6+ Kd8
A3 -0.59/62 4.Nc3 d6* 5.d4 g4 6.Bxf4 gxf3 7.Qxf3 Nc6 8.Bb5 Bd7 9.0-0-0 h5 10.Qf2 Nce7 11.Bc4 Ng6 12.Bxf7+ *there is a) -0.49/58 4.Nc3 Bg7 5.d4 d6 6.g3 Nc6 7.d5 Ne5 8.gxf4 gxf4 9.Bxf4 Bg4 10.Bb5+ Kf8 11.Be2 Nxf3+ 12.Bxf3 b) -0.40/59 4.Nc3 Nc6 5.g3 Bg7 6.d4 d6 7.d5 Ne5 8.gxf4 gxf4 9.Bxf4 Bg4 10.Bb5+ Kf8 11.Be2 Nxf3+
A4 4.Bc4 -1.14/56 4...g4 5.0-0 gxf3 6.Qxf3 Qf6 7.d3 Nc6 8.Bxf4 d6 9.Nc3 Qg7 10.Nd5 Kd8 11.Bg3 Be6 12.Bh4+ Kc8 13.Nb6+ axb6 14.Bxe6+ Kb8 15.Qxf7 Qxf7 16.Bxf7 Be7
B1 3...Nf6 -0.23/69 4.Nc3 d5 5.exd5 Nxd5 6.Bc4 Nxc3 7.dxc3!? Bd6 8.0-0 0-0 9.Nd4 Qh4 10.Qf3 Bg4 11.Qf2 Qxf2+ 12.Rxf2 g5 13.h4 h6 14.hxg5 hxg5 15.g3 fxg3 16.Rf1 Nc6 17.Bxg5 Nxd4 18.cxd4 Kh7 19.Rf6 Be6 20.Bd3+ Kg7 21.Raf1 Rh8 22.Rxe6 fxe6 23.Bf6+ Kg8 24.Bxh8 Kxh8 [JLJ 7.dxc3 is interesting - 572 hours of computer time]
B2 4.e5 -0.63/51 4...Nh5 5.Be2 g5 6.0-0 Ng7 7.d4 h6 8.Re1 Be7 9.Nc3 0-0 10.Nd5 d6 11.Nxe7+ Qxe7 12.b3 Re8 13.Ba3 Qd8
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Section III: Only equality at best for black 1.e4 e5 2.f4 exf4 3.Nf3 - these lines are likely no threat to the King's gambit and are probably of no more interest to this analysis effort unless things change significantly.
A 3...Be7 65/93 -0.07 3...Be7 4.Nc3 Bh4+ 5.Ke2 Bf6 6.e5 Be7 7.d4 d6 8.Bxf4 g5 9.Bg3 g4 10.Nd2 dxe5 11.dxe5 Nc6 12.Ke1 h5 13.Nde4 Bf5 14.Bc4 h4 15.Bf4 Bb4 16.Kf2 Bxc3 17.Nxc3 Qe7 18.Bb5 Kf8 19.Qd2 Nxe5 20.Qd5 g3+ 21.Kf1 f6 22.Bxe5 c6 23.Bd6 cxd5
B 3...h6 65/45 0.00 3...h6 4.d4 g5 5.Nc3 d6 6.g3 c6 7.Bc4 Qe7 8.0-0 Bh3 9.Rf2 fxg3 10.hxg3 Nd7 11.Rh2 Bg4 12.Bxg5 hxg5 13.Rxh8 Nh6 14.Be2 Qf6 15.Rxf8+ Kxf8 16.Kg2 Bxf3+ 17.Bxf3 Re8 18.Qd2 Qg6 19.Be2 Nf6 20.Bd3 Qg7 21.Rh1 Nfg4 22.Be2 Qg6 23.a3 Kg7
Stockfish 201022 71/94 133:14:39 -0.12 4.d4 g5 5.h4 Bg7 6.hxg5 hxg5 7.Rxh8 Bxh8 8.g3 Nc6 9.Nc3 g4 10.Ne5 f3 11.Nxg4 d6 12.Bh3 Nxd4 13.Be3 Nc6 14.Qxf3 Bxc3+ 15.bxc3 Qe7
Stockfish 2020Sep15 67/98 131:21:30 -0.13 4.d4 g5 5.h4 Bg7 6.hxg5 hxg5 7.Rxh8 Bxh8 8.g3 d5 9.Nc3 Bg4 10.Nxd5 c6 11.Nc3 fxg3 12.Bg2 Nd7 13.Ne2 Bxf3 14.Bxf3 Qf6 15.Nxg3 Qxd4 16.Qxd4 Bxd4 17.Bxg5 Bxb2 18.Rb1 Be5
C 3...d5 65/101 0.00 3...d5 4.exd5 Nf6 5.Bb5+ c6 6.dxc6 Nxc6 7.Nc3 Be6 8.0-0 Bd6 9.Ng5 0-0 10.Nxe6 fxe6 11.d4 Qc7 12.Kh1 Kh8 13.Bc4 Qb6 14.Bxf4 Bxf4 15.Rxf4 Rad8 16.Bd3 Qxb2 17.Qe1 Nxd4 18.Rb1 Qa3 19.Rxb7 Qd6 20.Rh4 Nf5 21.Ra4 Nd7 22.Ne4 Qc6 23.Raxa7 Ne5
D 3...c6 65/8 0.00 3...c6 4.d4 Nf6 5.Nc3 d5 6.exd5 Bd6 7.Qe2+ Qe7 8.Qxe7+ Kxe7 9.dxc6 Nxc6 10.Bc4 Be6 11.Bxe6 fxe6 12.Bd2 Rad8 13.0-0-0 Bb8 14.Ne2 Ne4 15.Bxf4 Bxf4+ 16.Nxf4 Nf2 17.Rhe1 Nxd1 18.d5 Nf2 19.dxc6 bxc6 20.Rxe6+ Kd7 21.Re2 Ng4 22.h3 Nh6 23.Ne5+ Kd6
E 3...Bb4 65/87 0.00 3...Bb4 4.Be2 h6 5.Nc3 Ne7 6.a3 Bxc3 7.dxc3 d6 8.Bxf4 0-0 9.0-0 Ng6 10.Bg3 Nd7 11.Bc4 Qe7 12.Qd4 Nde5 13.Bd5 c6 14.Bb3 c5 15.Nxe5 dxe5 16.Qe3 Be6 17.Bxe6 fxe6 18.a4 b6 19.b3 Rxf1+ 20.Rxf1 Rd8 21.c4 Qd6 22.h4 Qd2 23.Qxd2 Rxd2 24.Rf2 Rd1+ 25.Rf1
F 3...Ne7 +0.00/55 4.d4 d5 5.Nc3 dxe4 6.Nxe4 Nd5 7.Bc4 Be6 8.0-0 Be7 9.Re1 Nc6 10.a3 a6 11.Qd3 Qd7 12.b4 0-0 13.Bxd5 Bxd5
G 3...Nc6 +0.18/54 4.d4 g5 5.d5 g4 6.dxc6 gxf3 7.Qxf3 Qh4+ 8.g3 fxg3 9.hxg3 Qf6 10.Qb3 dxc6 11.Bf4 a5 12.Nc3 a4 13.Nxa4 Bg4 14.Be2 Bxe2 15.Kxe2 Qg6 16.Nc3 b5 17.Bxc7 Nf6 18.Raf1 Nd7 19.Nd1 Ra7
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Section IV: 1.e4 e5 2.f4 exf4 3.other than Nf3
A 3.Bc4
-0.52/66 3...Nc6 4.d4 Nf6 5.Nc3 Bb4 6.Nge2 f3 7.gxf3 d5 8.exd5 Nxd5 9.Qd3 0-0 10.h4 Nce7 11.Bxd5 Nxd5 12.Kf2 Nxc3 13.Nxc3 c6 14.a3 Bxc3 15.Qxc3 Re8
-0.74/62 3...Nc6 4.d4 Qh4+ 5.Kf1 d6 6.Nf3 Bg4 7.Nxh4 Bxd1 8.Nc3 Bxc2 9.Bxf4 Nf6 10.Nf3 Be7 11.Re1 Nb4
-0.52/59 3...Qh4+ 4.Kf1 Nf6 5.Nf3 Qh6 6.d4 d6 7.Nc3 Be7 8.Kg1 c6 9.e5 dxe5 10.Nxe5 0-0 11.Qf3 Nbd7 12.Nd3 Qh5 13.Bxf4 Re8 14.Re1 Qxf3
B 3.Nc3
-1.16/67 3...Qh4+ 4.Ke2 d5 5.Nxd5 Bg4+ 6.Nf3 Nc6 7.Nxc7+ Kd8 8.Nxa8 Ne5 9.Qe1 Nxf3 10.Qxh4+ Nxh4+ 11.Ke1 g5 12.d3 Kc8 13.Bd2 Nf6 14.Bc3 Be7
C 3.Be2
-1.25/73 3...f5 4.e5 Nc6 5.d4 d6 6.Bxf4 dxe5 7.dxe5 Qxd1+ 8.Bxd1 Be6 9.Nc3 0-0-0 10.Bf3 Nge7 11.g3 Nb4 12.Rc1 Bd7 13.a3 Nbc6 14.Bh5 g6 15.Be2 Nd4
D Other
54/81 -0.87 3.Qf3 Nc6 4.Qxf4 Bd6 5.Qe3 Nf6 6.d4 0-0 7.Bd3 Bb4+ 8.c3 d5 9.e5 Ng4 10.Qg3 Be7 11.Nf3 f6 12.e6 Bxe6 13.Na3 f5 14.0-0 Qd7 15.Ng5 Bxg5 16.Bxg5 Rf7 17.h4 Nf6 18.Qh2 Re8 19.Be2 a6 20.Rae1 Ne7
53/71 -1.18 3.Qe2 Nc6 4.Nc3 Nd4 5.Qd3 Qh4+ 6.Kd1 Ne6 7.Qe2 Bc5 8.g3 Qd8 9.Bh3 fxg3 10.hxg3 d6 11.Nf3 c6 12.d3 Nf6 13.a4 Nd4 14.Nxd4 Bxd4 15.Bxc8 Qxc8 16.Be3 Bxe3 17.Qxe3 0-0 18.Kd2 Re8 19.Raf1 Qe6
40/62 -1.13 3.d4 Qh4+ 4.Ke2 d5 5.exd5 Bg4+ 6.Nf3 Bxf3+ 7.gxf3 Nd7 8.Qe1 Qf6 9.Kd1+ Ne7 10.Qe4 g5 11.h4 h6 12.Nd2 0-0-0 13.Nb3 Ng6 14.h5 Nh4 15.c4 Nf5 16.Qd3 Bg7 17.Bh3 Nxd4 18.Qxd4 Qxd4+ 19.Nxd4 Bxd4
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Section V: 1.e4 e5 2.f4 other
A 2...d5
62/74 -0.09 3.exd5 exf4 4.Nf3 Nf6 5.Bb5+ c6 6.dxc6 Nxc6 7.Nc3 Be6 8.0-0 Bd6 9.Ng5 0-0 10.Nxe6 Qb6+ 11.d4 fxe6 12.Bxc6 bxc6 13.Bxf4 Bxf4 14.Rxf4 Qxb2
B 2...Bc5
56/79 +0.06 3.Nf3 d6 4.c3 Nc6 5.fxe5 dxe5 6.Bb5 Bd7 7.d3 Nge7 8.b4 Bb6 9.Bc4 Ng6 10.a4 a6 11.Qe2 Qf6 12.Na3 h6 13.Be3 Bxe3 14.Qxe3 0-0 15.0-0
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