cute move from Brainfish

[jdart]

Blankenberg (Brainfish 210916 64)-Eisb?r (Triple Brain), playchess.com 2016:

[d] 1r3rk1/2q2pp1/1p2pR1B/p2pPn1Q/P6P/2P3P1/1P3PK1/4R3 w - -

White has other winning moves, but best is Bxg7, which caused Black to resign.

--Jon

[yanquis1972]

recent SF dev output is interesting


Analysis by Stockfish 041216 64 BMI2:

1.Qg5 Nxh6 2.Rxh6 Qc6 3.Rh5 d4+ 4.Kh2 dxc3
White is slightly better: +/= (0.31) Depth: 7/8 00:00:00 12kN
White is slightly better: +/= (0.42) Depth: 8/8 00:00:00 15kN
1.Rxf5 exf5 2.Bf4 Qc6 3.e6 fxe6 4.Bxb8 Rxb8 5.Qg6
White is better: +/- (1.02) Depth: 9/10 00:00:00 53kN
1.Bf4 Qd7 2.Rxf5 exf5 3.e6 fxe6 4.Bxb8 Rxb8 5.Qe2 b5 6.axb5 Rxb5
White is slightly better: +/= (0.54) Depth: 10/14 00:00:00 91kN
White is slightly better: +/= (0.61) Depth: 11/18 00:00:00 122kN
1.Bxg7 Nxg7 2.Qg5 Qb7 3.h5 Kh7 4.Qh6+ Kg8 5.Rf4 Qe7 6.Re3 Rfd8 7.Ref3 Rb7 8.Rxf7 Qxf7 9.Rxf7 Rxf7 10.Qg6 Rdf8 11.h6 Rxf2+ 12.Kh3 R8f7 13.hxg7 Rxb2 14.Qxe6 Kxg7 15.Qxd5
White is slightly better: +/= (0.38) Depth: 12/24 00:00:00 401kN
White is clearly better: +/- (1.40) Depth: 20/34 00:00:02 15837kN
1.Bc1
White is better: +/- (0.95 ++) Depth: 21/37 00:00:04 34990kN
White is better: +/- (0.90 ++) Depth: 22/40 00:00:06 48165kN
1.Bxg7 Nxg7 2.Qg5 Qb7 3.h5 Kh7 4.Qh6+ Kg8 5.Rf4 Qe7 6.Re3 Rfc8 7.Ref3 Rc7 8.Rxf7 Qxf7 9.Rxf7 Rxf7 10.Qg6 Rbf8 11.f4 Kh8 12.Kf2 Nf5 13.Qxe6 Rg7 14.Qxb6 Nxg3 15.Kf3 Nf5 16.Qxa5 Rg3+ 17.Kf2 Rb8 18.b3 Rg4 19.Qxd5 Rxf4+ 20.Ke2 Rh4
White is better: +/- (0.93) Depth: 22/42 00:00:06 48937kN
1.Bc1 Qb7
White is better: +/- (0.93) Depth: 23/49 00:00:08 65955kN, tb=2
White is clearly better: +- (1.66 --) Depth: 33/74 00:01:21 771MN, tb=2065
1.Bxg7
White is clearly better: +- (1.73 ++) Depth: 33/74 00:01:32 870MN, tb=2168
White has a decisive advantage: +- (3.23 ++) Depth: 33/74 00:01:46 1014MN, tb=2382

seems that top engines spot the idea instantly but it can take some depth before they settle on it as best

[Dann Corbit]

Stockfish Mate Finder version has an easy time with this one:

Code: Select all

Searching: 1r3rk1/2q2pp1/1p2pR1B/p2pPn1Q/P6P/2P3P1/1P3PK1/4R3 w - - 0 1
infinite: 0 ponder: 0 time: 0 increment: 0 moves to go: 0

 1   -0.02   00:00      73  Bf4 gxf6 
 2   +0.76   00:00     205  Qg5 Rfc8 g4 
 3   +0.31   00:00     373  Qg5 Nxh6 Rxh6 
 4   +0.65   00:00     904  Bf4 gxf6 exf6 Qc6 
 5   +0.44   00:00    1766  Rxf5 exf5 Bf4 Qb7 e6 
 6   +0.71   00:00    3032  Bf4 d4 Rxf5 exf5 e6 Qc6+ Qf3 
 7   +0.47   00:00    3879  Bf4 Qb7 g4 d4+ f3 Ne7 cxd4 Ng6 
 8   +0.75   00:00    6172  Bxg7 Nxg7 Qg5 Qb7 h5 d4+ Kg1 Rfe8 cxd4 
 9   +1.17   00:00    7091  Bxg7 Nxg7 Qg5 Qc6 h5 d4+ Kg1 dxc3 h6 
10   +0.90   00:00   14349  Bxg7 Nxg7 Qg5 Qc6 h5 Kh7 g4 Qxa4 Re3 Qd1 Kh2 Qb1 
11   +0.94   00:00   24131  Bxg7 Nxg7 Qg5 Qc6 h5 Kh7 g4 Qxa4 Re3 Qd1 Rh3 Qb3 Kg1 
12   +1.38   00:00   87735  Bxg7 Nxg7 Qg5 Qc4 h5 Kh7 h6 Ne8 Rxe6 Qc8 Re7 Qc6 e6 d4+ f3 
13   +1.48   00:00   93505  Bxg7 Kxg7 Qg5+ Kh7 g4 Ng7 f4 Rh8 h5 b5 f5 exf5 gxf5 bxa4 Rh6+ Kg8 f6 Rxb2+ Kh1 
14   +1.90   00:00  144125  Bxg7 Kxg7 Qg5+ Kh8 g4 Ng7 f4 Rbe8 h5 d4 h6 Nh5 Qxh5 dxc3 bxc3 Rd8 
15   +1.78   00:00  161467  Bxg7 Kxg7 Qg5+ Kh8 g4 Ng7 f4 Rbe8 h5 d4 h6 Nh5 Qxh5 dxc3 bxc3 Qc6+ Kf2 Qxc3 Re2 Qd4+ Kg2 Qd1 g5 
16   +0.65   00:00  402639  Bxg7 Nxg7 Qg5 Rbd8 Kh2 Kh7 Rh6+ Kg8 h5 Rd7 Rf6 Kh7 g4 Qc4 f4 Qxa4 f5 Qc2+ Kg1 Qd3 fxe6 Re7 Rh6+ Kg8 Qxe7 Qg3+ Kf1 Nxe6 
17   +0.55   00:02   1206K  Bxg7 Nxg7 Qg5 Qb7 Kh2 Qd7 Rd1 Rbc8 h5 Kh7 g4 Qxa4 Rd2 Qe4 f3 Qb1 Rg2 Qe1 Rd2 
18   +0.98   00:03   2084K  Bxg7 Nxg7 Qg5 Qb7 h5 Kh7 Qh6+ Kg8 Rf4 Qe7 Re3 Rbc8 Rf6 Qd7 Qg5 Kh7 Ref3 Rc4 b3 Re4 g4 d4 Rg6 fxg6 Rxf8 Nxh5 gxh5 Qg7 Qxg6+ Qxg6+ hxg6+ Kg7 
19   +1.00   00:04   2258K  Bxg7 Nxg7 Qg5 Qb7 h5 Kh7 Qh6+ Kg8 Rf4 Qe7 Re3 Rbc8 b3 Rc7 Ref3 Rb8 Rxf7 Qxf7 Rxf7 Rxf7 Qg6 Rbf8 h6 Rxf2+ Kh3 R8f7 hxg7 
20   +0.77   00:08   4833K  Bc1 d4 g4 Ne7 Bh6 gxh6 Qxh6 Rfd8 h5 Nd5 Qg5+ Kf8 h6 Nxf6 exf6 Qc6+ f3 Ke8 Qg8+ Kd7 Qxf7+ Kc8 cxd4 Rxd4 Qxe6+ Qxe6 Rxe6 Kd7 Re7+ Kd6 g5 Rf8 h7 
21   +1.16   00:14   8260K  Bxg7 Nxg7 Qg5 Rbc8 h5 Kh7 Rh6+ Kg8 Re3 Qd8 Rf6 Kh8 b3 Rc7 Ref3 Qe7 R3f4 Rfc8 g4 Rd8 Rf3 Rf8 Kf1 Rfc8 Kg1 Qf8 Kg2 Rb7 
22   +2.44   00:18  10789K  Bxg7 Nxg7 Qg5 Kh7 Rd1 Rh8 Rd4 Kg8 Rg4 Rh7 h5 d4 cxd4 b5 h6 bxa4 hxg7 Qb7+ Rf3 Rc8 Rh4 Rxh4 Qxh4 Kxg7 Qf4 
23   +2.92   00:22  13138K  Bxg7 Kxg7 Qg5+ Kh7 g4 Ng7 f4 Rh8 f5 Kg8 fxe6 fxe6 h5 d4 cxd4 Qc2+ Kg3 Qd3+ Rf3 Qh7 Qf6 Qxh5 gxh5 Nxh5+ Kf2 Nxf6 Rg1+ Kf7 Rxf6+ Ke8 Rxe6+ Kd7 Rd6+ Ke8 b3 Rd8 Rgg6 Rxd6 Rxd6 Rh3 Re6+ Kf7 Rxb6 Rd3 Rf6+ Ke7 
24   +3.16   00:30  17602K  Bxg7 Nxg7 Qg5 Qd7 h5 Kh8 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f6 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Rxa4 Rxe6 b5 Rb6 b4 b3 Ra3 cxb4 d4 g4 axb4 Rxb4 d3 Rb7 d2 Rd7 
25   +3.14   00:30  17855K  Bxg7 Nxg7 Qg5 Qd7 h5 Kh8 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f6 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Rxa4 Rxe6 b5 Rb6 b4 b3 Ra3 cxb4 d4 
26   +3.21   00:32  18753K  Bxg7 Nxg7 Qg5 Qd7 h5 Kh8 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f6 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Rxa4 Rxe6 d4 Rxb6 dxc3 bxc3 Rc4 Ra6 a4 Ra7 Rxc3 Rxa4 
27   +3.19   00:37  22271K  Bxg7 Nxg7 Qg5 Qb7 h5 Kh7 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f5 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Re4 b3 Kh7 Kf3 Re1 g4 Rb1 Rxe6 Rxb3 Kf4 Rxc3 g5 Rc4+ Ke5 d4 Ke4 
28   +3.23   00:39  23457K  Bxg7 Nxg7 Qg5 Qb7 h5 Kh7 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f5 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Re4 b3 Kh7 Kf3 Re1 g4 Rb1 Rxe6 Rxb3 Kf4 Rxc3 Rxb6 Rc4+ Kf5 Rxa4 Rd6 Ra2 f4 a4 Rxd5 
29   +3.38   00:50  29709K  Bxg7 Nxg7 Qg5 Qb7 h5 Kh7 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f5 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Re4 b3 Kg7 Rg6+ Kh7 Kf3 Re1 g4 Rc1 g5 Rxc3+ Kf4 Rxb3 Rxe6 Rb2 f3 Rb4+ Ke5 d4 Rh6+ Kg8 
30   +3.56   01:16  45344K  Bxg7 Kxg7 Qg5+ Kh7 g4 Ng7 f4 Rh8 f5 Kg8 fxe6 fxe6 Ref1 Qb7 Kg3 Rh7 h5 Qe7 h6 Kh8 Rf8+ Qxf8 Rxf8+ Rxf8 hxg7+ Rxg7 Qh6+ Kg8 Qxe6+ Kh7 Qxb6 Rf5 Qe6 Rfg5 Kf4 R7g6 Qxd5 Rxg4+ Ke3 Rg2 Kd3 Rxb2 e6 Rg3+ Kc4 
31   +3.51   01:26  50946K  Bxg7 Nxg7 Qg5 Qb7 h5 Kh7 Qh6+ Kg8 Rf4 Qe7 Rh1 Rbc8 Rhh4 Rc4 Rhg4 f5 exf6 Rxf6 Rxg7+ Qxg7 Qxf6 Qxf6 Rxf6 Re4 b3 Kg7 Rg6+ Kh7 Kf3 Re1 g4 Rc1 g5 Rxc3+ Kf4 Rxb3 Rxe6 b5 g6+ Kg7 Re7+ Kf8 Rd7 

[reflectionofpower]

Houdini 4,Stockfish 8,Chess Tiger 2007,Fire 5,Gull 3.1 found it rather quickly.