25.g6!!

[Jack Lad]

[d] 2qrrbk1/1b3ppp/pn1Pp3/6P1/1Pp2B2/1nN2NQB/1P3P1P/3RR1K1 w - - 1 25

Can any engine find this move?

http://www.chessgames.com/perl/chessgame?gid=1053758

[Nimzovik]

Hmmmmmmmmm interesting..............

[Dirt]

Stockfish 1.2 finds it quickly.

[royb]

[d] 2qrrbk1/1b3ppp/pn1Pp3/6P1/1Pp2B2/1nN2NQB/1P3P1P/3RR1K1 w - - 1 25

Can any engine find this move?

http://www.chessgames.com/perl/chessgame?gid=1053758

Glaurung 2.2 finds this very quickly:

Glaurung 2.2 (32-bit) 1-cpu 2.5 Ghz (VMware - Guest OS=Linux):

2 +0.29 25.Ne4 Nd5 (1.19)
2 +0.41 25.Be3 Nd5 (1.21)
2 +0.45 25.Nd4 Nxd4 26.Rxd4 (1.21)
3 -0.76 25.Nd4 Nxd4 26.Rxd4 Qc6 (1.23)
3 +0.43 25.Be3 Nd5 26.Rxd5 Bxd5 27.Nxd5 Bxd6 (1.23)
3 +0.52 25.Bg4 Bc6 26.Nd4 Nxd4 27.Rxd4 (1.24)
4 +0.27 25.Bg4 Qc6 26.Re4 Nd5 (1.26)
4 +0.33 25.Be5 Qc6 26.Re4 Nd5 (1.26)
5 +0.25 25.Be5 Qc6 26.Ne4 Nd5 27.Qh4 Nxb4 (1.29)
5 +0.31 25.Nd4 Nxd4 26.Rxd4 Be7 27.Ne4 Bc6 (1.32)
6 +0.13 25.Nd4 Nxd4 26.Rxd4 Qc6 27.Bg2 Qxg2+ 28.Qxg2 Bxg2 29.Kxg2 Be7 (1.34)
6 +0.25 25.Be5 Qc6 26.Ne4 Nd5 27.Qh4 Nxb4 (1.34)
6 +0.37 25.Bg4 Qc6 26.Bh5 g6 27.Bg4 Bg7 (1.35)
7 +0.07 25.Bg4 Qc6 26.Ne4 Qb5 27.Nd4 Qxb4 28.Nxb3 cxb3 (1.38)
7 +0.19 25.Be5 Qc6 26.Ne4 Qb5 27.Qh4 Qxb4 28.Qf4 (1.40)
8 +0.35 25.Be5 Qc6 26.Ne4 Nd5 27.Qh4 Nxb4 28.Qh5 Nd3 (1.47)
9 +0.17 25.Be5 Qc6 26.Ne4 Qb5 27.Qh4 Bxe4 28.Rxe4 Nd5 29.g6 hxg6 (1.62)
9 +0.23 25.Nh4 Qa8 26.Bf1 Bc6 27.Qg4 Qb7 28.Qe2 Qa7 29.Qh5 (1.73)
9 +0.31 25.Nd4 Nxd4 26.Rxd4 Qc6 27.Bg2 Qxg2+ 28.Qxg2 Bxg2 29.Kxg2 Nd7 30.g6 hxg6 31.Rxc4 (1.82)
10 +0.49 25.Nd4 Nxd4 26.Rxd4 Qc6 27.Bg2 Qxg2+ 28.Qxg2 Bxg2 29.Kxg2 Nd7 30.b5 e5 31.Rde4 axb5 32.Nxb5 (2.01)
11 +0.47 25.Nd4 Nxd4 26.Rxd4 Rd7 27.Bg2 Red8 28.Red1 Bxg2 29.Qxg2 Qb7 30.Qh3 Qc6 31.Ne4 (2.55)
12 +0.33 25.Nd4 Nxd4 26.Rxd4 Rd7 27.Bg2 Red8 28.Red1 Bxg2 29.Qxg2 Qa8 30.Qh3 Qc6 31.Qg3 Na4 (3.41)
12 +1.45 25.g6 hxg6 26.Ng5 Nd7 27.Nxf7 Kxf7 28.Rxe6 Kg8 29.Qxg6 Bf3 30.Rxe8 Rxe8 31.Be6+ Kh8 (7.64)
13 +1.76 25.g6 hxg6 26.Ng5 Nd7 27.Nxf7 Kxf7 28.Rxe6 Kg8 29.Qxg6 Bf3 30.Rxe8 Rxe8 31.Be6+ Kh8 32.Qf7 (8.88)
14 +1.19 25.g6 hxg6 26.Ng5 Nd7 27.Nce4 Bxe4 28.Rxe4 Qc6 29.Qh4 Nf6 30.Bg2 Qb5 31.Bf1 Be7 32.Rxc4 (11.74)
15 +1.15 25.g6 hxg6 26.Ng5 Nd7 27.Nce4 Bxe4 28.Rxe4 Qc6 29.Qh4 Nf6 30.Bg2 Qb5 31.Bf1 Be7 32.Bxc4 Qxb4 (16.06)
16 +1.13 25.g6 hxg6 26.Ng5 Nd7 27.Nce4 Nf6 28.Qh4 Nh5 29.Bg4 f6 30.Nxe6 Bxe4 31.Nxg7 f5 32.Nxe8 fxg4 33.Rxe4 Rxe8 34.Rxe8 Qxe8 35.Qxg4 Nxf4 36.Qxf4 (28.25)
17 +3.35 25.g6 hxg6 26.Ng5 Nd7 27.Qh4 Nf6 28.Bg4 Be7 29.dxe7 Rxd1 30.Nxd1 Qc6 31.Bf3 Qc8 32.Bxb7 Qxb7 33.Bd6 Qd7 34.Qf4 Rxe7 35.Bxe7 Qxe7 36.Qxc4 (163.62)

[kgburcham]

12.11 0:06 +0.46++ 25.g6
12.01 0:06 +0.66++ 25.g6
12.01 0:08 +1.06++ 25.g6
13.02 0:18 +0.96++ 25.g6
13.01 0:21 +1.16++ 25.g6
13.01 0:27 +1.56++ 25.g6
13.01 1:08 +2.36++ 25.g6

[daws]

Rybka sees g6 as the best move at a reported depth of 12 but changes its mind to Bg2, only to revert back to g6 at a reported depth of 14.

Analysis by Rybka 3 32-bit :

1.Be5
= (0.02) Depth: 2 00:00:00
1.Bg4
= (0.03) Depth: 2 00:00:00
1.Bg4
= (0.04) Depth: 3 00:00:00
1.Bg4
= (0.00) Depth: 4 00:00:00
1.Nd4
= (0.20) Depth: 4 00:00:00
1.Nd4 Qd7
= (0.09) Depth: 5 00:00:00
1.Nd4 Qd7 2.Nxb3
= (0.23) Depth: 6 00:00:00 5kN
1.Nd4 Qd7 2.Nxb3 cxb3 3.Bf1
= (0.01) Depth: 7 00:00:00 13kN
1.Nd4 Qd7 2.Nxb3 cxb3 3.Rd4 Nc8
= (0.19) Depth: 8 00:00:00 28kN
1.Nd4 Qd7 2.Nxb3 cxb3 3.Rd4 Ba8 4.Be5 Qb7
= (0.18) Depth: 9 00:00:00 42kN
1.Bg4 Qc6 2.Re4 Qc8 3.Ree1 Qc6 4.Re4 Qc8 5.Ree1 Qc6 6.Re4 Qc8 7.Ree1 Qc6 8.Re4 Qc8 9.Ree1 Qc6 10.Re4 Qc8 11.Ree1 Qc6 12.Re4 Qc8 13.Ree1 Qc6 14.Re4 Qc8 15.Ree1 Qc6 16.Re4
= (0.00) Depth: 10 00:00:03 171kN
1.Bg2 Qa8 2.Qg4 Bc6 3.Nd4 Bxg2 4.Qxg2 Qxg2+ 5.Kxg2 Bxd6 6.Nxe6 Rxe6 7.Bxd6 Nc8 8.Bc5 Rd3
= (0.09) Depth: 10 00:00:09 466kN
1.Bf1 Rd7 2.Qh3 Nd5 3.Nxd5 Bxd5 4.g6 fxg6 5.Ng5
= (0.17) Depth: 10 00:00:10 499kN
1.Bf1 Ba8 2.Qh3 Qb7 3.Bg2 Qc6 4.Nh4 Qc8
= (0.15) Depth: 11 00:00:17 866kN
1.Bf1 Bd5 2.h4 Qb7 3.Nxd5 exd5 4.Rxe8 Rxe8 5.h5 Nd7 6.Bh3 Re2
= (0.17) Depth: 12 00:00:27 1414kN
1.Bg2 Qa8 2.b5 Nd5 3.Nxd5 Bxd5 4.b6 Qb7 5.d7 Qxd7 6.Bc7 Qb5 7.Bxd8
= (0.25) Depth: 12 00:00:34 1740kN
1.g6
² (0.35) Depth: 12 00:00:35 1774kN
1.g6
² (0.55) Depth: 12 00:00:35 1791kN
1.g6
± (0.95) Depth: 12 00:00:41 2041kN
1.g6 hxg6 2.Ng5 Nd7 3.Nxf7 Qc6 4.Bg2 Qxg2+ 5.Qxg2 Bxg2 6.Nxd8 Bf3 7.Bg5 e5 8.Ne4 Nd4 9.Kf1
= (0.20) Depth: 12 00:00:43 2188kN
1.Bg2 Qa8 2.b5 Nd5 3.Nxd5 Bxd5 4.b6 Qb7 5.d7 Qxd7 6.Bc7 Qb5 7.Bxd8
= (0.25) Depth: 12 00:00:43 2188kN
1.Bg2 Rd7 2.Qh4 Qa8 3.g6 fxg6 4.Qh3 h6 5.Rxe6 Rf7 6.Rxe8 Qxe8 7.Be3 Nd7 8.Nh4 Bxg2 9.Qxg2 Rf6 10.Ne4 Re6
² (0.40) Depth: 13 00:01:11 3608kN
1.Bg2
² (0.60) Depth: 14 00:02:00 6006kN
1.Bg2 Rd7 2.Qh3 Bd5 3.g6 fxg6 4.Ng5 h6 5.Nxe6 Bxg2 6.Qxg2 Rf7 7.Nxf8 Rxe1+ 8.Rxe1 Qxf8 9.Nd5 Kh7 10.Nxb6 Rxf4 11.Rd1 Qd8 12.d7 Nd4 13.Qa8
² (0.59) Depth: 14 00:02:13 6692kN
1.g6
± (0.80) Depth: 14 00:02:26 7284kN
1.g6
± (1.20) Depth: 14 00:02:42 7992kN
1.g6
+- (2.00) Depth: 14 00:03:24 10007kN
1.g6 fxg6 2.Ng5 Rd7
+- (2.34) Depth: 14 00:05:28 16351kN

[Dirt]

Glaurung 2.2 finds this very quickly:

Glaurung 2.2 and Stockfish 1.2 are of course almost the same program. On my system Stockfish is about 7% faster, for whatever reason.

[Werewolf]

Even Fritz 9 finds it in 1 second