Test Position: Bronstein vs Keres, Goteborg 1995

[muxecoid]

Sorry for resurfacing old threads.

It may be MP luck but Stockfish 1.7 sees Bxh6 after 15 minutes while SF1.6 likes Nf5 even after 90 minutes.

In my opinion this is a strong contender for the title of the most beautiful sacrifice ever played. It looks like black surely can defend with bishop and knight on the kingside and more pieces ready to come and help. After Qd2 it is very hard for humans to see that Nc5!! is the only defence

[Graham Banks]

In my opinion this is a strong contender for the title of the most beautiful sacrifice ever played

I seem to recall that Tartakower played a similarly deep sacrifice that might have been even more beautiful. Pretty sure it involved a rook sacrifice for a pawn. Hopefully somebody can post the game.

Cheers,
Graham.

[kgburcham]

[D] r1b3k1/pp1n3p/2pbpq1r/3p4/2PPp1p1/PP2P1P1/1BQN1P1P/3RRBK1 b - -
17...Rxh2

[Result "0-1"]
[White "Geza Maroczy"]
[Black "Savielly Tartakower"]

1. d4 e6 2. c4 f5 3. Nc3 Nf6 4. a3 Be7 5. e3 O-O 6. Bd3 d5
7. Nf3 c6 8. O-O Ne4 9. Qc2 Bd6 10. b3 Nd7 11. Bb2 Rf6
12. Rfe1 Rh6 13. g3 Qf6 14. Bf1 g5 15. Rad1 g4 16. Nxe4 fxe4
17. Nd2 Rxh2 18. Kxh2 Qxf2+ 19. Kh1 Nf6 20. Re2 Qxg3 21. Nb1
Nh5 22. Qd2 Bd7 23. Rf2 Qh4+ 24. Kg1 Bg3 25. Bc3 Bxf2+
26. Qxf2 g3 27. Qg2 Rf8 28. Be1 Rxf1+ 29. Kxf1 e5 30. Kg1 Bg4
31. Bxg3 Nxg3 32. Re1 Nf5 33. Qf2 Qg5 34. dxe5 Bf3+ 35. Kf1
Ng3+ 0-1

[royb]

On my laptop using 1 core for Stockfish-1.7 I get this:

1 -1.81 1.Bf4 (1.14)
2 -2.18 1.Bf4 d5 (1.14)
2 -1.81 1.Nd6 Bd5 (1.14)
3 -1.61 1.Nd6 Bd5 2.Bf4 (1.14)
4 -1.97 1.Nd6 Bxd6 2.Qxd6 Nc5 (1.14)
5 -1.65 1.Nd6 Bxd6 2.Qxd6 Nc5 3.Bf4 (1.14)
6 -1.81 1.Nd6 Bxd6 2.Qxd6 Nc5 3.Nf5 Nfe4 (1.14)
7 -1.69 1.Nd6 Bxd6 2.Qxd6 Nc5 3.Nf5 Be4 4.Qg3 Bxf5 5.Bxf5 (1.15)
8 -1.53 1.Nd6 Bxd6 2.Qxd6 Re8 3.Nf5 Be4 4.Qg3 Bxf5 5.Bxf5 g5 (1.17)
9 -1.77 1.Nd6 Bxd6 2.Qxd6 Re8 3.Nf5 Ne4 4.Qd4 Qf6 5.Qxd7 Nac5 (1.20)
9 -1.29 1.Nf5 d5 2.Qf3 Nc5 3.Qg3 (1.22)
9 -1.05 1.Nf5 d5 2.Qf3 Nc5 3.Qg3 (1.22)
9 -2.02 1.Nd6 Bxd6 2.Qxd6 Re8 3.Nf5 Ne4 4.Qd4 Qf6 5.Qxd7 Nac5 (1.25)
9 -1.13 1.Nf5 Nc5 2.Qe2 Be4 3.Bxe4 Ncxe4 4.Qxc4 d5 5.Qc6 a6 (1.26)
10 -0.92 1.Nf5 d5 2.Qf3 Bc8 3.Qg3 Bxf5 4.Bxf5 Ne4 5.Bxe4 dxe4 6.Bxh6 Bf6 7.Rad1 (1.35)
11 -1.33 1.Nf5 d5 2.Qf3 Bc8 3.Qg3 Bxf5 4.Bxf5 Kh8 5.Re1 Nc5 (1.45)
11 -1.53 1.Nf5 d5 2.Qf3 Bc8 3.Qg3 Bxf5 4.Bxf5 Kh8 5.Nd4 Nc5 6.Qh3 Nce4 7.Bf4 Kg8 8.Nc6 (1.51)
12 -1.17 1.Nf5 d5 2.Bf4 Nc5 3.Qe1 Nce4 4.Nxe7+ Qxe7 5.Bd6 Qd7 6.Bxf8 Rxf8 7.Nd4 Re8 8.f3 Nc5 (2.00)
13 -1.09 1.Nf5 d5 2.Bf4 Nc5 3.Nxe7+ Qxe7 4.Bd6 Qd7 5.Bxf8 Qxb5 6.Be7 Nfe4 7.f3 Re8 8.fxe4 Rxe7 9.exd5 Qxb2 10.d6 Re3 (2.52)
14 -1.37 1.Nf5 d5 2.Bf4 Re8 3.Nbd6 Bxd6 4.Nxd6 Re7 5.Nf5 Re6 (3.07)
14 -1.29 1.Nf5 d5 2.Bf4 Re8 3.Bd6 Bf8 4.Bxf8 Rxf8 5.Re1 Nc5 6.Nbd6 Rb8 7.Re7 Bc8 8.Nxc8 Rxc8 9.Qf3 Nce4 10.Bxe4 dxe4 11.Nxh6+ Kh8 (4.24)
15 -1.53 1.Nf5 d5 2.Qe2 Re8 3.Qe3 Bc8 4.Nxg7 Ng4 (5.16)
15 -1.05 1.Nf5 d5 2.Bxh6 gxh6 3.Qc1 Ne4 4.Bxe4 dxe4 5.Rd1 (6.30)
15 -0.80 1.Nf5 d5 2.Bxh6 gxh6 3.Qc1 Ne4 4.Bxe4 dxe4 5.Rd1 (7.00)
15 -0.88 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Bf4 d5 5.Qc7 Ba6 6.Qxd8 Raxd8 7.Nc7 Bxf1 8.Nxe8 Rxe8 9.Rxf1 Bc5 10.b4 (8.16)
16 -1.01 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Bf4 d5 5.Qb3 Qd7 6.Nxe7+ Rxe7 7.Rfe1 g5 8.Be3 Bc6 9.Bd3 Nc5 10.Bxc5 bxc5 11.Rac1 (10.43)
17 -1.05 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nfe4 4.Nxe7+ Rxe7 5.Be3 d5 6.Qe2 Ba6 7.Rfd1 Qd7 8.a4 Bxb5 9.axb5 Rae8 10.f3 (13.90)
18 -0.92 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nfe4 4.Qe2 d5 5.Qg4 Bg5 6.Bxg5 Qxg5 7.Qxg5 hxg5 8.Nc7 (22.83)
18 -0.92 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Nbd4 Rc8 5.Qd3 Bd5 6.Qh3 Be6 7.Bf4 Bc5 8.Qd3 d5 9.Rae1 Ng4 (23.84)
19 -1.09 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Nbd4 Rc8 5.Qd3 Bd5 6.Qh3 Be6 7.Bf4 Bc5 8.Qd3 d5 9.Rae1 Nh5 (26.22)
19 -1.01 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Nbd4 Rc8 5.Qd3 Bd5 6.Qh3 Be6 7.Ba4 Bc5 8.Be3 Ng5 9.Qh4 Bxf5 10.Nxf5 Bxe3 11.fxe3 (31.22)
20 -1.17 1.Nf5 Nc5 2.Bf4 Be4 3.Nxe7+ Qxe7 4.Bd6 Bxc2 5.Bxe7 Bxd1 6.Bxf8 Be2 7.Rfe1 (40.90)
20 -1.09 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Be3 d5 5.Qc7 Ba6 6.a4 Bc5 7.Rfd1 Bxe3 8.Nxe3 Bxb5 9.Qxd8 Raxd8 10.axb5 Rd7 11.Rd4 Nc5 12.Kf1 Ne6 13.Rda4 (56.45)
21 -0.96 1.Nf5 Bd5 2.Bf4 Re8 3.Nfd6 Bxd6 4.Nxd6 Re6 5.Bf5 (70.21)
21 -0.84 1.Nf5 Nc5 2.Bf4 d5 3.Re1 Ne6 4.Nbd6 Bxd6 5.Bxd6 Re8 6.Ba4 Nd7 7.Qf3 a6 8.Qg3 Ng5 9.Ne7+ Kh8 10.Nc6 (73.94)
21 -0.80 1.Nf5 Nc5 2.Bf4 Ne6 3.Nxe7+ Qxe7 4.Bd6 Qd8 5.Bxf8 Qxf8 6.Qd6 Bc6 7.Qxf8+ Kxf8 8.Nd6 Nd4 9.Bd1 Ne8 10.Nxc4 Bb5 11.Ne3 Bxf1 12.Kxf1 Nf6 13.Rc1 d5 14.Ba4 Ne6 15.Rd1 d4 16.Nf5 Rd8 17.Rd3 (98.94)
22 -0.96 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Be3 d5 5.Qc7 Ba6 6.Qxd8 Raxd8 7.Nxa7 Bxf1 8.Nc6 Bc5 9.Nxd8 Bb5 10.Bxe4 Nxe4 11.Nb7 Bxe3 12.fxe3 Ba6 13.Nbd6 Nxd6 14.Nxd6 Re6 15.Nf5 Bd3 16.Nd4 Rxe3 17.Kf2 (157.97)
23 -1.05 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Be3 d5 5.Qc7 Ba6 6.Qxd8 Raxd8 7.Nc7 Bxf1 8.Nxe8 Rxe8 9.Rxf1 Bc5 10.Rc1 Bxe3 11.Nxe3 Rc8 12.f3 Nd6 13.Rd1 Nc4 14.Nxc4 dxc4 15.Kf2 g6 16.Ba4 Kg7 17.Ke3 (206.33)
24 -1.09 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Be3 Rc8 5.Qe2 Ba6 6.Bd3 Bxb5 7.Bxb5 Bc5 8.Rfc1 Bxe3 9.Nxe3 Re5 10.Rxc8 Qxc8 11.Bd3 Qc6 12.Rd1 d6 13.f3 Nc5 14.Bf5 g6 (299.16)

24 -0.88 1.Bxh6 Bxg2 2.Kxg2 gxh6 3.Qc1 (374.39)
24 -0.72 1.Bxh6 Bxg2 2.Kxg2 gxh6 3.Qc1 Ng4 4.Qf4 f5 5.Nxf5 (397.78)
24 -0.88 1.Bxh6 gxh6 2.Qd2 Nc5 3.Rae1 Nd3 4.Qxh6 Ne8 5.Re5 f5 6.Rxf5 Ng7 7.Rh5 Rf6 8.Qh7+ Kf7 9.Nf5 Qg8 10.Nxe7 Kxe7 11.Bxd3 cxd3 12.Re5+ Re6 13.Rxe6+ dxe6 14.Qh4+ Kd7 15.Qg3 Rc8 16.Qxd3+ Bd5 17.Nxa7 Rc5 18.Re1 Nf5 (432.69)
25 -0.68 1.Bxh6 Nc5 2.Bxg7 Kxg7 3.Nf5+ Kh8 4.Nbd6 Bxd6 5.Nxd6 Ba6 6.Qd4 Kg8 7.Qh4 Nd3 8.b4 cxb3 9.Qg3+ Kh8 10.Bxd3 (586.77)
25 -0.48 1.Bxh6 Re8 2.Bg5 Nc5 3.Nf5 Nce4 4.Bxf6 Nxf6 5.Nfd6 (691.08)
25 -0.64 1.Bxh6 Nc5 2.Bxg7 Kxg7 3.Nf5+ Kh8 4.Nbd6 Bxd6 5.Nxd6 Kg7 6.Nf5+ Kg8 7.Qd4 Re8 8.Qf4 Ne6 9.Qg3+ Kf8 10.Qd6+ Re7 11.Rfe1 Ng8 12.Rad1 Bc6 13.b3 b5 14.bxc4 bxc4 15.Be4 Qb6 16.Nxe7 Nxe7 17.Bxc6 dxc6 18.Qe5 Rd8 19.Qh8+ Ng8 20.Rb1 Qa5 21.Re4 (885.06)
26 -0.32 1.Bxh6 Nc5 2.Bxg7 Kxg7 3.Nf5+ Kh8 4.Nbd6 Bxd6 5.Nxd6 Kg7 6.Nf5+ Kg8 7.Qd4 (1143.66)
26 +0.00 1.Bxh6 Bc5 2.Nf5 gxh6 3.Qd2 Ng4 4.Nxh6+ Nxh6 5.Qxh6 Re8 6.Bh7+ (1430.26)
26 +0.00 1.Bxh6 gxh6 2.Qd2 Nc5 3.Rae1 Nd3 4.Qxh6 Ne8 5.Re5 f5 6.Rxf5 Ng7 7.Rh5 Rf6 8.Qh7+ Kf7 9.Rf5 Qg8 10.Rxf6+ Bxf6 11.Bxd3 cxd3 12.Nd6+ Ke7 13.Ngf5+ Kf8 14.Qh6 Qe6 15.Nxb7 Bxb2 16.Qh8+ Qg8 17.Qh6 Qe6 (1565.36)

So after 374 seconds (6 mins 14 secs) it spots Bxh6 and sticks with it thereafter.

While not "fast", that's pretty good overall it seems in comparison to many other engines. My system runs at 3 GHz.

Roy

[Graham Banks]

[D] r1b3k1/pp1n3p/2pbpq1r/3p4/2PPp1p1/PP2P1P1/1BQN1P1P/3RRBK1 b - -
17...Rxh2

[Result "0-1"]
[White "Geza Maroczy"]
[Black "Savielly Tartakower"]

1. d4 e6 2. c4 f5 3. Nc3 Nf6 4. a3 Be7 5. e3 O-O 6. Bd3 d5
7. Nf3 c6 8. O-O Ne4 9. Qc2 Bd6 10. b3 Nd7 11. Bb2 Rf6
12. Rfe1 Rh6 13. g3 Qf6 14. Bf1 g5 15. Rad1 g4 16. Nxe4 fxe4
17. Nd2 Rxh2 18. Kxh2 Qxf2+ 19. Kh1 Nf6 20. Re2 Qxg3 21. Nb1
Nh5 22. Qd2 Bd7 23. Rf2 Qh4+ 24. Kg1 Bg3 25. Bc3 Bxf2+
26. Qxf2 g3 27. Qg2 Rf8 28. Be1 Rxf1+ 29. Kxf1 e5 30. Kg1 Bg4
31. Bxg3 Nxg3 32. Re1 Nf5 33. Qf2 Qg5 34. dxe5 Bf3+ 35. Kf1
Ng3+ 0-1

That's the one. Thanks. I wonder how engines fare with this one.

Cheers,
Graham.

[Marc MP]

Sorry for resurfacing old threads.

....

Don't be sorry! I think this helps to shows the progress of the "discipline". It is always one one the first thing I do when a new version of an engine appears: I compare it with the results posted on test positions we had before.

The new Stockfish is a true monster!

[yanquis1972]

wow -- i apparently had terrible MP luck.

[-0.16] d=30 1.Bxh6 Re8 2.Bg5 Nc5 3.Nf5 Bf8 4.Nbd6 Bxd6 5.Nxd6 Re5 6.Nxb7 Nxb7 7.f4 Re8 8.Qd4 Qe7 9.Rad1 Qc5 10.Bxf6 gxf6 11.Qxc5 Nxc5 12.Rd4 b5 13.Rd5 d6 14.Rxd6 Rad8 15.Rxd8 Rxd8 16.h4 Kg7 17.g3 Rd2 18.Rf2 Rd6 19.Re2 Ne6 20.Kf2 Nd4 21.Rd2 f5 (1:41:10) 22826509kN
[-0.12] d=29 1.Bxh6 Re8 2.Bg5 Nc5 3.Nf5 Bf8 4.Nbd6 Bxd6 5.Nxd6 Re5 6.Nxb7 Nxb7 7.f4 Re8 8.Qd4 Qe7 9.Rad1 Qc5 10.Bxf6 gxf6 11.Qxc5 Nxc5 12.Rd4 b5 13.Rd5 d6 14.Rxd6 Rad8 15.Rxd8 Rxd8 16.h4 Rd2 17.Rf2 Rd4 18.Rf1 Nd3 19.Rd1 Nxf4 20.Rxd4 Ne2 21.Kf2 Nxd4 22.Be4 (1:31:32) 20625866kN
[-0.44] d=29 1.Bxh6 (0:52:29) 11825905kN
[-0.64] d=29 1.Bxh6 Bc6 2.Qd2 Ng4 3.Bxg7 Bxb5 4.Bxf8 Bxf8 5.Qf4 (0:40:38) 9264982kN
[-1.05] d=29 1.Nf5 Re8 2.Nfd6 Bxd6 3.Nxd6 Re6 4.Nxb7 Qc7 5.b3 Qxb7 6.bxc4 Nc5 7.Be3 Rae8 8.Qd4 Nce4 (0:30:23) 7017634kN
[-0.84] d=28 1.Nf5 Re8 2.Nbd6 Bxd6 3.Nxd6 Re6 4.Nxb7 Qc7 5.b3 Qxb7 6.bxc4 Qc6 7.Ba4 Qe4 8.Bc2 Qe5 9.Be3 Rae8 10.Bd4 Qf4 11.Be3 Qh4 12.Rc1 Re5 13.Bd4 Re2 14.g3 Qg5 15.h4 Qd2 16.Bf5 Qa5 17.Be3 R8xe3 18.fxe3 Rxe3 19.Qd6 Qxa3 (0:26:03) 6018957kN
[-0.96] d=28 1.Nf5 Re8 2.Nbd6 Bxd6 3.Nxd6 Re6 4.Nxb7 (0:23:37) 5474447kN
[-0.80] d=28 1.Nf5 Nc5 2.Bf4 Be4 3.Bc7 Qe8 4.Bxe4 Ncxe4 5.Nfd6 Bxd6 6.Bxd6 Nxd6 7.Nxd6 Qd8 (0:10:57) 2576722kN
[-0.64] d=27 1.Nf5 Nc5 2.Bf4 Be4 3.Bc7 Qe8 4.Bxe4 Ncxe4 5.Nfd6 Bxd6 6.Bxd6 a6 7.Bxf8 Qxf8 8.Nc7 Ra7 9.Nd5 Qc5 10.Nxf6 Nxf6 11.Re1 d5 12.Re5 Re7 13.Rxe7 Qxe7 14.Qd4 b5 15.Rd1 Qe2 16.Qd2 Qxd2 17.Rxd2 Kf8 18.Kf1 Ke7 19.Ke2 Kd6 20.Rd1 (0:09:40) 2263783kN
[-0.64] d=26 1.Nf5 Nc5 2.Bf4 Be4 3.Bc7 Qe8 4.Bxe4 Ncxe4 5.Nfd6 Bxd6 6.Bxd6 a6 7.Bxf8 Qxf8 8.Nc7 Ra7 9.Nd5 Qc5 10.Nxf6 Nxf6 11.Re1 d5 12.Re5 Re7 13.Rxe7 Qxe7 14.Qd4 b5 15.Rd1 Qe2 16.Qd2 Qxd2 17.Rxd2 Kf8 18.Kf1 Ke7 19.Ke2 Kd6 20.Rd1 (0:07:53) 1836355kN
[-0.76] d=26 1.Nf5 Nc5 2.Bf4 d5 3.Be5 Qd7 4.Qf3 Nce4 5.Nbd4 Rad8 6.Bxe4 dxe4 7.Qg3 g6 8.Nxe7 Qxe7 9.Nf5 Qe6 10.Nxh6 Kh7 11.Qh4 (0:04:38) 1073187kN
[-0.96] d=25 1.Nf5 Nc5 2.Qe2 Ne6 3.Nbd6 Bxd6 4.Nxd6 Qc7 5.Rd1 Rae8 6.Qf1 Rb8 7.Qxc4 Qxc4 8.Nxc4 d5 9.Nd6 d4 10.Nf5 Rfd8 11.Bd3 Bd5 12.Ne7 Kh8 13.Nxd5 Nxd5 14.Bd2 Nc5 15.Bc4 Rbc8 (0:03:02) 694175kN
[-0.96] d=25 1.Nf5 Nc5 2.Qe2 Ne6 3.Qxc4 (0:02:36) 594995kN
[-0.88] d=25 1.Nf5 Nc5 2.Qe2 Ne6 3.Qxc4 d5 4.Qh4 Rc8 5.Bd3 a6 6.Nxe7 Qxe7 7.Nd4 (0:01:59) 453775kN
[-0.80] d=24 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Qc7 Qc8 5.Be3 a6 6.Qxc8 Raxc8 7.Bxe4 Nxe4 8.Nxe7 Rxe7 9.Nd4 Nf6 10.Rfe1 Be4 11.Rac1 Rxc1 12.Bxc1 Nd5 13.f3 Bd3 14.Rxe7 Nxe7 15.Kf2 Nd5 16.Ke1 Kh7 17.Kd2 Bf1 18.g3 (0:01:29) 334126kN
[-0.84] d=23 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Qc7 Qc8 5.Be3 a6 6.Qxc8 Raxc8 7.Bxe4 Nxe4 8.Nxe7 Rxe7 9.Nd4 Nf6 10.Rfe1 Re5 11.Bf4 Re4 12.Rxe4 Bxe4 13.f3 Nd5 14.Bd6 Bd3 15.Re1 f6 (0:00:59) 217325kN
[-0.88] d=22 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Qc7 Ba6 5.Qxd8 Raxd8 6.Nc7 Bxf1 7.Nxe8 Rxe8 8.Kxf1 Bf8 9.f3 Nd6 10.Ne3 Nb5 11.Nf5 Bc5 12.Bf4 Nd4 13.Bd3 Nd5 (0:00:38) 136853kN
[-0.84] d=22 1.Nf5 d5 2.Qe2 Bc5 3.Qe5 Kh8 4.Nxg7 d4 5.Nh5 Rg8 6.g3 (0:00:36) 127872kN
[-1.09] d=21 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Be3 Rc8 5.Qe2 Ba6 6.Bd3 Nc5 7.Bc2 d5 8.b4 Nce4 9.Bd3 Qd7 10.f3 Qxf5 11.fxe4 Qg4 12.e5 Qxe2 13.Bxe2 (0:00:29) 102070kN
[-1.09] d=21 1.Nf5 Nc5 2.Qe2 Re8 3.Qxc4 Nce4 4.Be3 Rc8 5.Qe2 Ba6 6.Bxe4 Nxe4 7.Qg4 Bg5 8.Bxg5 Qxg5 9.Qxg5 hxg5 10.Nxa7 Rc2 (0:00:23) 82006kN

[jwes]

[D] r1b3k1/pp1n3p/2pbpq1r/3p4/2PPp1p1/PP2P1P1/1BQN1P1P/3RRBK1 b - -
17...Rxh2

[Result "0-1"]
[White "Geza Maroczy"]
[Black "Savielly Tartakower"]

1. d4 e6 2. c4 f5 3. Nc3 Nf6 4. a3 Be7 5. e3 O-O 6. Bd3 d5
7. Nf3 c6 8. O-O Ne4 9. Qc2 Bd6 10. b3 Nd7 11. Bb2 Rf6
12. Rfe1 Rh6 13. g3 Qf6 14. Bf1 g5 15. Rad1 g4 16. Nxe4 fxe4
17. Nd2 Rxh2 18. Kxh2 Qxf2+ 19. Kh1 Nf6 20. Re2 Qxg3 21. Nb1
Nh5 22. Qd2 Bd7 23. Rf2 Qh4+ 24. Kg1 Bg3 25. Bc3 Bxf2+
26. Qxf2 g3 27. Qg2 Rf8 28. Be1 Rxf1+ 29. Kxf1 e5 30. Kg1 Bg4
31. Bxg3 Nxg3 32. Re1 Nf5 33. Qf2 Qg5 34. dxe5 Bf3+ 35. Kf1
Ng3+ 0-1

That's the one. Thanks. I wonder how engines fare with this one.

Cheers,
Graham.

Stockfish thinks that White may draw with 25. Rh2

[yanquis1972]

what is stockfish's improvement for white in the game line

1... Rxh2 2. Kxh2 Qxf2+ 3. Kh1 Nf6 4. Re2 Qxg3 5. Nb1 Nh5 6. Qd2 Bd7 7. Rf2
Qh4+ ?

[zullil]

wow -- i apparently had terrible MP luck.

I too, with Stockfish-1.7.0 (8 threads):

Code: Select all

Searching: r2q1rk1/pb1pbpp1/np3n1p/1N6/2p5/P5N1/1PB2PPP/R1BQ1RK1 w - -
infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     -2.18   00:01      748 Bf4 d5 
 2     -1.82   00:01     1058 Nd6 Bd5 
 3     -1.62   00:01     1352 Nd6 Bd5 Bf4 
 4     -1.98   00:01     2368 Nd6 Bxd6 Qxd6 Nc5 
 5     -1.66   00:01     3037 Nd6 Bxd6 Qxd6 Nc5 Bf4 
 6     -1.82   00:01     5159 Nd6 Bxd6 Qxd6 Nc5 Nf5 Nfe4 
 7     -1.70   00:01    10524 Nd6 Bxd6 Qxd6 Nc5 Nf5 Be4 Qg3 Bxf5 Bxf5 
 8     -1.70   00:01    13025 Nd6 Bxd6 Qxd6 Nc5 Nf5 Be4 Qg3 Bxf5 Bxf5 
 9  <  -1.78   00&#58;01    44690 Nd6 Bxd6 Qxd6 Re8 Nf5 Ne4 Qd4 Qf6 Qxd7 Nac5 
 9  <  -1.86   00&#58;01    63126 Nd6 Bxd6 Qxd6 Re8 Nf5 Ne4 Qd4 Qf6 Qxd7 Nac5 
 9  >  -1.62   00&#58;01    71180 Nf5 d5 Bf4 Bc5 Nbd6 Bc6 Qf3 Bxd6 Nxd6 
 9  >  -1.54   00&#58;01    73904 Nf5 d5 Bf4 Bc5 Nbd6 Bc6 Qf3 Bxd6 Nxd6 
 9  >  -1.37   00&#58;01    77513 Nf5 d5 Bf4 Bc5 Nbd6 Bc6 Qf3 Bxd6 Nxd6 
 9  >  -1.05   00&#58;01    91271 Nf5 d5 Bf4 Bc5 Nbd6 Bc6 Qf3 Bxd6 Nxd6 
 9     -1.13   00&#58;01   106312 Nf5 d5 Bf4 Bc5 Nbd6 Bc8 Qf3 Bxf5 Nxf5 h5 b4 Be7 
10     -1.01   00&#58;01   198576 Nf5 d5 Bf4 Bc5 Qf3 Ne4 Qg4 Qf6 Nxh6+ Kh8 Bxe4 
                              dxe4 Qf5 Qxf5 Nxf5 
11     -1.13   00&#58;01   471703 Nf5 d5 Bf4 Nc5 Qe1 Nce4 Nxe7+ Qxe7 Bd6 Qd7 Bxf8 
                              Qxb5 Qb4 Qxb4 Bxb4 a5 
12     -0.97   00&#58;01   869660 Nf5 Nc5 Qd4 Be4 Bxe4 Ncxe4 Qxc4 d5 Qc6 Bc5 Bf4 
                              Qe8 Nbd4 Bxd4 Nxd4 Qxc6 Nxc6 
13  <  -1.21   00&#58;01    1648k Nf5 d5 Qf3 Bc8 Qg3 Bxf5 Bxf5 Kh8 Bf4 Nc5 Nc7 Nh5 
13     -1.17   00&#58;01    1967k Nf5 d5 Bf4 Nc5 Re1 Nfe4 Bc7 Qe8 Nbd6 Qd7 Nxe7+ 
                              Qxe7 Nxb7 Qxc7 Nxc5 Qxc5 Bxe4 dxe4 Rxe4 Rad8 
14  <  -1.45   00&#58;02    3663k Nf5 d5 Bf4 Bc6 Nbd4 Bd7 Qf3 Bc5 Qg3 Nh5 Nxh6+ Kh8 
                              Qf3 Nxf4 Qxf4 Bxd4 Qxd4 Qg5 
14     -1.41   00&#58;02    3914k Nf5 d5 Bf4 Bc6 Nbd4 Bd7 Qf3 Bc5 Qg3 Nh5 Qg4 Qf6 
                              Be3 Bxf5 Bxf5 Rfe8 Bd7 Re7 Nc6 Rxe3 fxe3 Bxe3+ 
                              Kh1 
15  >  -1.05   00&#58;02    4169k Nf5 d5 Bf4 Bc6 Nbd4 Bd7 Qf3 Bc5 Qg3 Nh5 Qg4 Qf6 
                              Be3 Bxf5 Nxf5 Bxe3 fxe3 Qg5 Qxg5 hxg5 e4 
15     -0.93   00&#58;02    6645k Nf5 Nc5 Qe2 Nce4 Qxc4 Re8 Bf4 d5 Nxe7+ Qxe7 Qd3 
                              Ba6 Rae1 Rac8 Ba4 Rc4 b3 
16     -0.93   00&#58;04   16317k Nf5 Nc5 Bf4 d5 Re1 Ne6 Nc7 Bc5 Rxe6 fxe6 Nxe6 Qd7 
                              Nfxg7 d4 b4 Be7 Nxf8 Bxf8 Nh5 Ne4 
17  >  -0.69   00&#58;04   19016k Nf5 d5 Qd4 Qd7 Bxh6 gxh6 Qh4 Rfe8 Qxh6 
17     -1.05   00&#58;05   21364k Nf5 Nc5 Qe2 Re8 Qxc4 Nce4 Bf4 d5 Qa4 Bc6 Qb3 Qd7 
                              Nbd4 Bc5 Rae1 Rac8 Qf3 Bb5 Nxb5 Qxb5 
18  <  -1.17   00&#58;05   25280k Nf5 Nc5 Bf4 d5 Re1 Ne6 Nxe7+ Qxe7 Bd6 Qd7 Bxf8 
                              Qxb5 Bb4 a5 
18  >  -0.93   00&#58;07   33092k Nf5 Nc5 Bf4 d5 Nxe7+ Qxe7 Bd6 Qd7 Bxf8 Qxb5 Be7 
                              Qxb2 Bxc5 bxc5 Rb1 
18  <  -1.29   00&#58;07   34138k Nf5 Nc5 Bf4 d5 Nxe7+ Qxe7 Bd6 Qd7 Bxf8 Qxb5 Be7 
                              Qc6 Qf3 d4 Qxc6 Bxc6 Bf5 Nb3 Rad1 d3 Bxf6 gxf6 
                              Rfe1 Kg7 
18     -0.97   00&#58;09   48273k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Bd6 
                              Nxd6 Nbxd6 Qf6 Nxb7 Qxb2 Rd1 Qxc2 Nxc5 bxc5 Ne3 
                              f5 Nxc2 fxg4 Rxd7 
19  <  -1.13   00&#58;09   49170k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Bd6 
                              Nxd6 Nbxd6 Qf6 Nxb7 Qxb2 Rd1 Qxc2 Nxc5 bxc5 Ne3 
                              Qg6 Qxg6 fxg6 Rxd7 Rb8 
19     -1.09   00&#58;10   51071k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Bd6 
                              Nxd6 Nbxd6 Qf6 Rd1 Ba6 Nxc4 Bxc4 Qxc4 Qxb2 Ne3 
                              Kg8 Bg6 Qf6 
20  >  -0.93   00&#58;10   54593k Nf5 d5 Qd4 Re8 Qe5 Bc8 Nxg7 Ng4 Qh5 Kxg7 h3 
20  >  -0.77   00&#58;12   64495k Nf5 d5 Qd4 Re8 Qe5 Bf8 Qg3 g5 Qh3 Nc5 Nxh6+ Bxh6 
                              Qxh6 Nfe4 f3 
20     -0.89   00&#58;18  104414k Nf5 Re8 Nbd6 Bxd6 Nxd6 Re6 Bf5 Bd5 Bf4 Nc5 Qc2 
                              Qc7 Bxe6 dxe6 Bg3 Qc6 f3 Nd3 b3 Nh5 bxc4 Nxg3 
                              hxg3 Qxd6 cxd5 Qxd5 Qc7 Qd8 Qxd8+ Rxd8 Rfd1 Rd5 
21     -0.97   00&#58;21  128402k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Bd6 
                              Nxd6 Nbxd6 Qf6 Rd1 Ba6 Nxc4 Bxc4 Qxc4 Qxb2 Nd4 
                              Kg8 Qd5 Rb8 Bg6 
22  >  -0.77   00&#58;24  143791k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Bd6 
                              Nxd6 Nbxd6 Qf6 Rd1 Ba6 Nxc4 Bxc4 Qxc4 Qxb2 Nd4 
                              Kg8 Qd5 Rb8 Bg6 
22  <  -1.17   00&#58;29  181222k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Bd6 
                              Nxd6 Nbxd6 Qf6 Rd1 g6 Nxb7 gxf5 Qf3 Nxb7 Qxb7 Re8 
                              Qd5 Qe6 Qxe6 dxe6 Rd7 Kg7 Rxa7 Kf6 
22     -1.05   00&#58;38  244331k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Nbd6 Rxe1+ Qxe1 Bd5 Rd1 
                              Be6 Qc3 Nh5 Bc1 Bxf5 Nxf5 d5 b4 cxb3 Bxb3 Nxb3 
                              Qxb3 Nf6 Bb2 Rc8 Qa4 Rc7 Bxf6 Qxf6 Rxd5 
23  >  -0.93   00&#58;42  264157k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Nbd6 Rxe1+ Qxe1 Bd5 Rd1 
                              Be6 Qc3 Nh5 Bc1 Bxf5 Nxf5 d5 Qf3 Nf6 Ne3 Nd3 Bxd3 
                              cxd3 Rxd3 Rc8 Bd2 d4 Nf5 
23  <  -1.17   00&#58;45  289322k Nf5 Nc5 Bf4 d5 Nxe7+ Qxe7 Bd6 Qd7 Bxf8 Qxb5 Bxc5 
                              Qxc5 Qf3 Bc6 
23     -1.01   00&#58;58  375489k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Nbd6 Rxe1+ Qxe1 Bd5 Rd1 
                              Be6 Qc3 Bxd6 Bxd6 Bxf5 Bxf5 Nce4 Qxc4 Nxd6 Rxd6 
                              Qe7 Rd1 Re8 Bd3 d5 Qd4 Kf8 Bb5 Rc8 Qa4 Rc5 Qb3 
                              Kg8 
24  >  -0.93   01&#58;02  407450k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Re1 d5 
                              Nc7 Nf6 Qh4 Rc8 Nxh6 gxh6 Bxh6 
24  >  -0.85   01&#58;04  415132k Nf5 d5 Qd4 Bc5 Qf4 Ne4 Bxe4 dxe4 Qe5 f6 Qg3 g5 
                              Nxh6+ Kh8 Qh3 
24  >  -0.69   01&#58;08  443697k Nf5 Nc5 Re1 Re8 Bf4 Bf8 Rxe8 Nxe8 Qg4 Kh8 Re1 Nf6 
                              Qh3 d5 Be5 Kg8 Qg3 Qd7 Nbd6 
24     -0.77   01&#58;21  531412k Nf5 Nc5 Re1 Be4 Bxe4 Ncxe4 f3 Bc5+ Be3 a6 fxe4 
                              axb5 Bxc5 bxc5 e5 Nh7 Qd6 Qg5 Ne3 Qg6 Qxc5 Qc6 
                              Qxc6 dxc6 Nf5 Ra7 Kf2 Rd8 Rad1 Rd3 Rxd3 cxd3 
25     -0.97   02&#58;03  824352k Nf5 Nc5 Re1 Be4 Bxe4 Ncxe4 f3 Bc5+ Be3 a6 fxe4 
                              axb5 Bxc5 bxc5 e5 Nh7 Qd6 Ng5 Qxc5 Ne6 Qxb5 Qg5 
                              Nd6 Nf4 g3 Nd3 Qxc4 Nxe1 Rxe1 Qd2 Qe2 Qd4+ Qf2 
                              Qxf2+ Kxf2 Rfb8 Re2 
26  >  -0.65   03&#58;21    1359M Nf5 Nc5 Bf4 Kh8 Nxe7 Qxe7 Bd6 
26     -0.81   05&#58;19    2202M Nf5 Nc5 Bf4 Be4 Bc7 Qe8 Bxe4 Ncxe4 Nfd6 Bxd6 Bxd6 
                              Qe6 Bxf8 Rxf8 f3 Nc5 Re1 Qc6 Nxa7 Qb7 Nb5 Nd3 Re2 
                              Qc6 Nc3 d5 Qd2 Qc5+ Kh1 Ra8 Rf1 d4 Ne4 Nxe4 Rxe4 
                              f5 Re6 Kf7 Re2 Qa5 Qc2 Qd5 
27     -0.81   06&#58;07    2533M Nf5 Nc5 Bf4 Be4 Bc7 Qe8 Bxe4 Ncxe4 Nfd6 Bxd6 Bxd6 
                              Qe6 Bxf8 Rxf8 f3 Nc5 Re1 Qc6 Nxa7 Qb7 Nb5 Nd3 Re2 
                              Qc6 Nc3 d5 Qd2 Qc5+ Kh1 Ra8 Rf1 b5 Na2 d4 Nb4 
                              Nxb4 axb4 Qb6 Rfe1 d3 Re5 Ra2 Rc5 g5 Kg1 Kg7 
28  <  -0.89   09&#58;19    3878M Nf5 Re8 Nfd6 Bxd6 Nxd6 Re6 Nxb7 Qc7 b3 
28  <  -0.97   11&#58;23    4744M Nf5 Re8 Nbd6 Bxd6 Nxd6 Re6 
28     -0.85   21&#58;38    9126M Nf5 Re8 Qd4 Nc5 Qxc4 Ba6 a4 Bf8 Qh4 Nce4 Be3 d5 
                              Bd3 Qc8 Qf4 g5 Qf3 Re5 Ng3 Bc5 Nxe4 Nxe4 Rac1 Qd7 
                              Rfd1 Rae8 Qh5 Bxe3 fxe3 Nc5 Qxh6 Nxd3 Rxd3 Bxb5 
                              axb5 Qxb5 
29  <  -0.93   25&#58;07   10613M Nf5 Re8 Qd4 Bc5 Qc3 Re2 Qxc4 Rxc2 Qxc2 Be4 Qa4 
29  >  -0.77   27&#58;18   11521M Nf5 Nc5 
29  >  -0.69   32&#58;20   13608M Nf5 d5 Re1 Re8 Nxg7 Kxg7 Bxh6+ Kh8 Qd4 Nc5 Qh4 
                              Nce4 Rad1 a5 Nc3 Kg8 Nxe4 Nxe4 Qg4+ 
29     -0.89   38&#58;29   16230M Nf5 Re8 Qd4 Bc5 Qc3 Re2 Nbd4 Bxd4 Nxd4 Rxc2 Qxc2 
                              Nc5 b4 cxb3 Nxb3 Be4 Qd1 Nd3 Ra2 Rc8 f3 Nxc1 Nxc1 
                              Bd5 Rc2 Rxc2 Qxc2 Qe7 Qc8+ Kh7 Qc2+ g6 a4 Qc5+ 
                              Rf2 Kg7 Qd1 d6 Nb3 Bxb3 Qxb3 d5 Qd3 Qc1+ Rf1 Qc4 
                              Qxc4 dxc4 Kf2 
30  >  -0.81   41&#58;57   17688M Nf5 Re8 Qd4 Bc5 Qc3 Re2 Nbd4 Bxd4 Nxd4 Rxc2 Qxc2 
                              Nc5 b4 cxb3 Nxb3 Be4 Qd1 Nd3 Ra2 Rc8 Rc2 Rxc2 
                              Qxc2 Nf4 Qb2 Nxg2 
30  >  -0.73   44&#58;44   18861M Nf5 Re8 Qd4 Bc5 Qc3 Re2 Nbd4 Bxd4 Nxd4 Rxc2 Qxc2 
                              Nc5 
30     -0.85   47&#58;07   19886M Nf5 Re8 Qd4 Bc5 Qc3 Re2 Nbd4 Bxd4 Nxd4 Rxc2 Qxc2 
                              Nc5 b4 cxb3 Nxb3 Be4 Qd1 Nd3 Ra2 Nxc1 Nxc1 Rc8 
                              Ne2 Qe7 Ng3 d5 Qb3 Qc5 Nxe4 Nxe4 Re2 b5 Rb2 Nc3 
                              Re1 d4 Rd2 a5 Rd3 
30  >  -0.57   51&#58;22   21709M Bxh6 d5 Bxg7 Kxg7 Nf5+ Kh8 Qc1 Ng4 Nxe7 Qxe7 h3 
                              d4 Nxd4 Qf6 hxg4 
30  >  -0.24 1&#58;00&#58;14   25522M Bxh6 gxh6 Qd2 Ng4 Qd4 Nf6 Nf5 
30     +0.00 1&#58;19&#58;21   33823M Bxh6 gxh6 Qd2 Nc5 Qxh6 Be4 Nf5 Ne8 Bxe4 Nxe4 Rae1 
                              Bg5 Qh3 d5 f4 Bf6 Nh6+ Kg7 Nf5+ Kg8 
31     +0.00 1&#58;25&#58;09   36358M Bxh6 gxh6 Qd2 Nc5 Qxh6 Be4 Nf5 Ne8 Bxe4 Nxe4 Rae1 
                              d5 Qh3 Bf6 Nh6+ Kg7 Nf5+ Kg8 
32     +0.00 1&#58;42&#58;41   44081M Bxh6 gxh6 Qd2 Nc5 Qxh6 Be4 Nf5 Ne8 Bxe4 Nxe4 Rae1 
                              d5 Qh3 Bf6 Nh6+ Kg7 Nf5+ Kg8 
33     +0.00 2&#58;02&#58;26   52803M Bxh6 gxh6 Qd2 Nc5 Qxh6 Be4 Nf5 Ne8 Bxe4 Nxe4 Rae1 
                              d5 Qh3 Bf6 Nh6+ Kg7 Nf5+ Kg8 
34     +0.00 2&#58;44&#58;19   71228M Bxh6 gxh6 Qd2 Nc5 Qxh6 Be4 Nf5 Ne8 Bxe4 Nxe4 Rae1 
                              d5 Qh3 Bf6 Nh6+ Kg7 Nf5+ Kg8 
35     +0.00 3&#58;52&#58;24  101843M Bxh6 gxh6 Qd2 Nc5 Qxh6 Be4 Nf5 Ne8 Bxe4 Nxe4 Rae1 
                              d5 Qh3 Bf6 Nh6+ Kg7 Nf5+ Kg8 

Nodes&#58; 119334148904
Nodes/second&#58; 7337967
Best move&#58; Bxh6
Ponder move&#58; gxh6