Author: pavel
Date: 22:17:27 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 I think you are right. But I will give it some more time. Analysis by Yace 0.99.60: 1.b6 ± (1.36) depth: 1 00:00:07 1.b6 f5 ± (1.18) depth: 2 00:00:07 1.b6 f5 2.b7 Nb8 ± (1.34) depth: 3 00:00:07 1.b6 f5 2.b7 Nb8 3.Ke5 ± (1.32) depth: 4 00:00:07 1.b6 f5 2.b7 h5 3.gxh5 gxh5 ± (1.35) depth: 5 00:00:07 2kN 1.b6 f5 2.b7 fxg4 3.hxg4 h5 4.gxh5 gxh5 ± (1.26) depth: 6 00:00:07 5kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 Nb8 5.h5 ± (1.28) depth: 7 00:00:07 23kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 Nb8 5.Ke5 Kg6 ± (1.21) depth: 8 00:00:07 47kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.Nb6 Nb8 5.Ke5 Kg6 6.Nd5 h5 ± (1.16) depth: 9 00:00:09 84kN 1.b6 Kh6 2.h4 f5 3.g5+ Kg7 4.b7 Nb8 5.Ke5 h6 6.Kf4 ± (1.08) depth: 10 00:00:10 579kN 1.g5 f5 2.gxf6+ Nxf6 ± (1.09) depth: 10 00:00:10 579kN 1.g5 h6 2.Nf6 Nf8 3.b6 Ne6+ 4.Ke3 Nd8 5.h4 Nb7 ± (1.18) depth: 10 00:00:10 579kN 1.g5 h6 2.Nf6 Nf8 3.Ne8+ Kh7 4.b6 Ne6+ 5.Kc4 ± (1.18) depth: 11 00:00:10 963kN 1.g5 Kf8 2.b6 Kg7 3.b7 h6 4.h4 hxg5 5.hxg5 f5 6.gxf6+ Kh7 +- (1.41) depth: 12 00:00:12 1702kN 1.g5 Kh8 2.Nf6 Nf8 3.Kd5 Ne6 4.b6 Nf4+ 5.Ke5 Ng2 6.Kd6 Kg7 +- (1.50) depth: 13 00:00:15 3944kN 1.b6 Kh6 2.b7 Kg5 3.Nb4 f5 4.gxf5 Kh4 5.f6 Kxh3 +- (1.51) depth: 13 00:00:17 6176kN 1.b6 Kh6 2.b7 Kg5 3.Nb4 f5 4.gxf5 h5 5.fxg6 Nc5 +- (1.81) depth: 13 00:00:20 7748kN 1.b6 Kh6 2.b7 f5 3.gxf5 gxf5 4.h4 Nb8 5.Ke5 Kh5 6.Kxf5 Kxh4 7.Nf6 Kg3 8.Nxh7 Kf3 +- (1.90) depth: 13 00:00:22 9223kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.Nb4 Nb8 5.Kd5 f4 6.Nc6 f3 7.Ne5+ Ke7 8.Nxf3 h5 +- (2.05) depth: 14 00:00:34 18288kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.Nb4 Nb8 5.Kd5 f4 6.Nc6 f3 7.Ne5+ Ke7 8.Nxf3 Kd7 9.Ne5+ Kc7 +- (2.05) depth: 15 00:00:49 28761kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kh6 4.h4 Kg6 5.Ke3 Nb8 6.Kf4 Kh5 +- (1.97) depth: 16 00:01:28 54472kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 h6 5.Kc4 Ke6 6.Nc7+ Ke5 7.Na6 f4 8.b8Q+ Nxb8 +- (1.90) depth: 17 00:03:03 122760kN 1.g5 h6 2.Nf6 Nb8 3.Ne8+ Kg8 4.gxh6 Nd7 5.Kd5 f5 6.Kd6 Nb6 7.Nf6+ Kf7 8.h7 Nc8+ 9.Kc7 Ke6 +- (1.91) depth: 17 00:03:19 134019kN 1.g5 f5 2.gxf6+ Kf7 3.b6 Nxb6 4.Nxb6 Kxf6 5.Ke3 Kg5 6.Kf2 Kh4 7.Nc4 g5 8.Nb6 h5 9.Kg2 g4 10.Na8 +- (1.90) depth: 17 00:03:53 157672kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 h6 5.Kc4 Ke6 6.Nc7+ Ke5 7.Na6 f4 8.b8Q+ Nxb8 +- (1.90) depth: 17 00:03:53 157672kN 1.b6 f5 2.gxf5 gxf5 3.b7 Kf7 4.h4 h6 5.Nb4 f4 6.Nd3 Nb8 7.Nxf4 Ke7 +- (2.05) depth: 18 00:08:26 353608kN (Mahamood, home 02.12.2001)
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