Author: Chris Taylor
Date: 22:15:55 12/01/01
Go up one level in this thread
On December 01, 2001 at 23:53:30, Peter McKenzie wrote: >I am working on an endgame test suite, and finding it surprisingly difficult to >get good test positions. It is interesting that many of the positions found in >chess books either have a dual solution, or (less common) the solution has a >mistake. > >Take the following position for example: > >[D]8/3n1pkp/6p1/1P1N4/3K2P1/7P/8/8 w - - > >Chigorin - Marshall, Karlsbad 1907 > >Chigorin played the thematic 1.g5!, which clearly wins as it prevents any black >counter-play. > >But I think that most computers will initially prefer 1.b6, and it is unclear if >this is winning or not. I think tablebases could be quite useful here, so >perhaps someone could run crafty/yace/fritz/tiger etc on it for a decent amount >of time. > >One possible attempted defence is 1.b6 f5 2.gf gf 3.b7, it might be worth >starting a search from there. > >cheers, >Peter 5 Minutes per engine. 5 Piece endgame databases. PIII 733. Chris Taylor Analysis by Hiarcs 7.32: 1.b6 f5 2.b7 fxg4 3.hxg4 h5 4.gxh5 gxh5 +- (1.82) Depth: 1 00:00:00 +- (1.75) Depth: 6/16 00:00:00 22kN 1.g5 h6 2.Nf6 Nb6 3.h4 hxg5 4.hxg5 Kf8 5.Nd5 Nc8 6.b6 Nd6 +- (1.80) Depth: 6/18 00:00:00 29kN +- (1.95) Depth: 11/29 00:00:27 3936kN, tb=3 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.Nb6 Nb8 5.Ke5 Ke7 6.Nc4 Kd7 7.Na5 f4 8.Kxf4 +- (2.05) Depth: 11/30 00:00:51 7477kN, tb=71 +- (2.23) Depth: 12/30 00:02:22 20788kN, tb=325 1.g5 h6 2.Nf6 Nb8 3.Ne8+ Kh7 4.Kd5 hxg5 5.Kd6 Kg8 6.Kc7 f5 7.Nd6 Kg7 8.Kxb8 +- (2.30) Depth: 12/30 00:02:43 24035kN, tb=328 +- (2.25) Depth: 13/30 00:04:17 37890kN, tb=415 Analysis by Fritz 7: 1.g5 f5 2.gxf6+ Kf7 3.h4 Ke6 4.b6 Kd6 5.b7 Kc6 6.f7 Kxb7 7.Nf4 Kc6 8.Ne6 +- (2.00) Depth: 9/20 00:00:00 62kN +- (2.25) Depth: 19/34 00:02:27 54549kN, tb=2064 Analysis by Fritz 6: 1.g5 h6 2.Nf6 ± (1.31) Depth: 1/1 00:00:00 +- (1.66) Depth: 3/8 00:00:00 1.b6 f5 2.b7 fxg4 3.hxg4 h5 4.gxh5 gxh5 5.Nb6 Nb8 +- (1.69) Depth: 3/8 00:00:00 +- (1.50) Depth: 9/16 00:00:00 64kN 1.g5-- +- (1.53) Depth: 9/16 00:00:00 72kN +- (1.88) Depth: 18/34 00:01:07 36852kN, tb=3420 1.b6 f5 2.g5 h6 3.gxh6+ Kxh6 4.b7 Kg7 5.Nb4 g5 +- (1.91) Depth: 18/34 00:01:59 60056kN, tb=10042 +- (2.03) Depth: 19/34 00:03:23 99891kN, tb=20396 1.g5! +- (2.06) Depth: 19/34 00:03:43 109932kN, tb=22154 +- (2.38) Depth: 20/35 00:05:06 153018kN, tb=30008 Analysis by Junior 7: 1.b6 Kh6 2.b7 Kg5 3.Ke3 h5 4.gxh5 gxh5 5.Kf3 h4 6.Nc3 f5 ± (1.19) Depth: 3 00:00:00 ± (0.99) Depth: 18 00:00:03 1440kN, tb=189 1.g5 f5 2.Nf6 Nb6 3.Kc5 Na4+ 4.Kc6 h6 5.h4 hxg5 6.hxg5 Kf8 7.Nd7+ Kg7 8.b6 Nxb6 9.Kxb6 Kh7 10.Nf6+ ± (1.12) Depth: 18 00:00:05 2297kN, tb=299 ± (1.30) Depth: 25 00:04:34 119719kN, tb=55435 Analysis by Nimzo 8: 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.Nf4 Kf6 5.Nh5+ +- (1.84) Depth: 1/11 00:00:01 +- (1.97) Depth: 9/23 00:00:02 1.g5 h6 2.h4 hxg5 3.hxg5 Kf8 4.b6 Ke8 5.Kc4 Nb8 6.Kb5 +- (1.98) Depth: 9/23 00:00:02 +- (2.04) Depth: 13/29 00:00:07 2644kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kg6 4.Nb4 Kh5 5.Nc6 f4 6.Ne5 +- (2.05) Depth: 13/29 00:00:10 4109kN +- (2.22) Depth: 14/31 00:00:38 20847kN 1.g5 f5 2.gxf6+ Kf7 3.h4 Ke6 4.b6 h6 5.b7 g5 6.h5 +- (2.23) Depth: 14/31 00:00:43 23783kN +- (2.48) Depth: 17/35 00:02:53 101916kN 1.b6 +- (2.49) Depth: 17/35 00:04:52 174744kN +- (2.49) Depth: 17/35 00:04:52 174744kN Analysis by Chess Tiger 14.0: 1.b6 Nxb6 2.Nxb6 Kh6 3.Nd7 Kg5 4.Ke3 h5 5.Ne5 hxg4 6.Nxg4 Kh4 7.Nf2 f6 8.Kf3 g5 9.Ke4 Kg3 +- (2.52) Depth: 9 00:00:00 98kN, tb=2 +- (2.48) Depth: 16 00:01:35 20344kN, tb=18930 1.g5 f5 2.b6 Kf7 3.b7 Ke6 4.Nf6 Nb8 5.Nxh7 Kd6 6.Nf8 Nc6+ 7.Ke3 Kc7 8.Nxg6 Kxb7 9.Kf4 Kc7 10.Kxf5 +- (2.64) Depth: 16 00:03:22 44695kN, tb=29873 +- (2.70) Depth: 17 00:04:52 65796kN, tb=40732 Analysis by Crafty 18.12: 1.b6 Nxb6 2.Nxb6 +- (2.48) Depth: 1/3 00:00:02 +- (1.66) Depth: 2/3 00:00:02 1.h4 f5 2.gxf5 gxf5 +- (1.75) Depth: 2/3 00:00:02 +- (1.54) Depth: 3/5 00:00:02 1.b6 Nxb6 2.Nxb6 +- (1.66) Depth: 3/5 00:00:02 1.g5 h6 2.Nf6 Nb6 +- (1.92) Depth: 3/5 00:00:02 +- (1.53) Depth: 4/7 00:00:02 1.h4 f5 2.gxf5 gxf5 3.h5 h6 +- (1.74) Depth: 4/7 00:00:02 +- (1.54) Depth: 5/10 00:00:02 1.Ke4 Nc5+ 2.Ke5 Nd3+ 3.Kd6 Nf2 4.Nf4 +- (1.62) Depth: 5/10 00:00:02 1.g5 h6 2.Nf6 Nb6 3.Kc5 +- (1.65) Depth: 5/10 00:00:02 1.b6 Nxb6 2.Nxb6 Kh6 3.h4 f6 +- (1.78) Depth: 5/10 00:00:02 +- (1.68) Depth: 6/12 00:00:02 9kN 1.g5 h6 2.h4 hxg5 3.hxg5 Nf8 4.Ke5 Ne6 +- (1.83) Depth: 6/12 00:00:02 14kN +- (1.76) Depth: 7/13 00:00:02 21kN 1.b6 Nxb6 2.Nxb6 f5 3.gxf5 gxf5 4.Ke5 Kg6 5.Nd5 +- (1.81) Depth: 7/13 00:00:02 47kN +- (1.65) Depth: 8/15 00:00:02 60kN 1.Ke4 h6 2.Kf4 f6 3.b6 h5 4.b7 hxg4 5.hxg4 Nb8 6.Ke4 Kf7 +- (1.80) Depth: 8/15 00:00:02 127kN +- (1.93) Depth: 10/19 00:00:03 496kN, tb=8 1.g5 f5 2.b6 Nxb6 3.Nxb6 h6 4.h4 hxg5 5.hxg5 Kf7 6.Ke5 Kg7 7.Nc8 Kh7 8.Ne7 Kg7 9.Nxf5+ gxf5 10.Kxf5 +- (2.18) Depth: 10/19 00:00:03 602kN, tb=10 +- (2.07) Depth: 16/30 00:03:03 88924kN, tb=18896 Analysis by Yace 0.99.50: 1.b6 Kh6 2.h4 f5 3.g5+ Kg7 4.b7 Nb8 5.Ke5 h6 6.Kf4 ± (1.35) Depth: 1 00:00:02 ± (1.08) Depth: 10 00:00:03 551kN 1.g5 h6 2.Nf6 Nf8 3.Ne8+ Kh7 4.b6 Ne6+ 5.Kd5 Nd8 6.Nd6 hxg5 7.b7 Nxb7 8.Nxb7 ± (1.09) Depth: 10 00:00:03 588kN +- (1.51) Depth: 13 00:00:08 2842kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 h6 5.Nb6 Nb8 6.Ke5 Ke8 7.h5 Kd8 8.Nd5 Kd7 9.Ne3 +- (1.52) Depth: 13 00:00:13 5554kN +- (1.88) Depth: 17 00:03:45 102918kN 1.g5 f5 2.gxf6+ Kf7 3.b6 Nxb6 4.Nxb6 Kxf6 5.Ke4 Kg5 6.Kf3 Kh4 7.Kg2 g5 8.Na4 h5 9.Kh2 g4 10.Nb2 +- (1.89) Depth: 17 00:04:06 113349kN +- (1.88) Depth: 17 00:04:44 132337kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 h6 5.Nb6 Nb8 6.Ke5 Ke8 7.h5 Kd8 8.Nd5 Kd7 9.Ne3 +- (1.88) Depth: 17 00:04:44 132337kN +- (1.88) Depth: 17 00:04:44 132337kN Analysis by Gandalf 5 beta: 1.b6 Nxb6 2.Nxb6 Kh6 3.Ke5 Kg5 4.Nd5 h6 5.Ke4 +- (2.33) Depth: 2 00:00:02 +- (2.43) Depth: 9 00:00:02 165kN 1.h4 f5 2.gxf5 gxf5 3.b6 Nxb6 4.Nxb6 Kg6 5.Nd5 h5 +- (2.44) Depth: 9 00:00:03 165kN +- (2.48) Depth: 9 00:00:03 165kN 1.g5 f5 2.b6 h6 3.gxh6+ Kxh6 4.b7 Kg5 5.Ke3 Nb8 6.Kf3 Kh4 7.Kg2 Kh5 8.Kg3 g5 9.Kf3 +- (2.49) Depth: 9 00:00:03 400kN +- (2.41) Depth: 15 00:03:24 48218kN
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