Author: Uri Blass
Date: 05:13:00 10/16/01
Can your program see the win? Note that yace needs a long time to avoid Kd4 that is clearly not the fastest way to win even if it wins because after 1.Kd4 Kd8 you get a repetition that only humans understand and computers do not know to evaluate it as a repetition. Note that I analyzed this position some years ago and my conclusion was that white can win by 1.b6 cxb6 2.a6 bxa6 3.c6 Yace does not understand the idea and it seems that yace's main line is leading to draw. yace also cannot see deep in the pawn endgame and I wonder if avoiding qsearch can help it. Tiger can get bigger depth but it does not help it to see 1.b6 in a short time(maybe 1.Kd3 also wins but it seems to me a strange way to win when 1.b6 is the simple way0 New position [D]4k3/pppppppp/8/PPPPPPPP/4K3/8/8/8 w - - 0 1 Analysis by Yace 0.99.56: 1.h6 gxh6 2.gxh6 +- (1.75) Depth: 1 00:00:00 1.Kd4 +- (1.89) Depth: 1 00:00:00 1.Kd4 h6 +- (1.83) Depth: 2 00:00:00 1.Kd4 g6 2.hxg6 +- (1.64) Depth: 3 00:00:00 1.h6 c6 2.bxc6 dxc6 +- (1.68) Depth: 3 00:00:00 1.h6 gxh6 2.gxh6 +- (1.75) Depth: 3 00:00:00 1.h6 gxh6 2.gxh6 b6 3.d6 +- (1.55) Depth: 4 00:00:00 1.Kd4 g6 2.hxg6 hxg6 +- (1.64) Depth: 4 00:00:00 1.Kd4 g6 2.fxg6 fxg6 3.h6 a6 +- (1.64) Depth: 5 00:00:00 5kN 1.Kd4 d6 2.e6 dxc5+ 3.Kxc5 b6+ 4.Kb4 fxe6 +- (1.43) Depth: 6 00:00:13 7188kN 1.Kd4 g6 2.fxg6 fxg6 3.h6 e6 4.d6 Kd8 5.Ke4 cxd6 ± (1.40) Depth: 7 00:02:48 89152kN 1.h6 gxh6 2.gxh6 f6 3.d6 cxd6 4.exd6 exd6 5.b6 a6 6.cxd6 Kd8 7.Kd4 Kc8 +- (1.41) Depth: 7 00:03:15 103181kN 1.h6 gxh6 2.gxh6 Kd8 3.Kd4 f6 +- (1.41) Depth: 7 00:03:35 113366kN 1.e6 fxe6 2.fxe6 dxe6 3.dxe6 g6 4.h6 c6 5.b6 axb6 6.axb6 Kd8 7.Kd3 Kc8 8.Kd4 Kd8 9.Ke5 +- (1.42) Depth: 7 00:05:58 190458kN 1.e6 fxe6 2.fxe6 dxe6 3.dxe6 g6 4.h6 c6 +- (1.42) Depth: 7 00:06:30 207203kN 1.e6 fxe6 2.fxe6 dxe6 3.dxe6 g6 4.h6 c6 5.b6 axb6 6.cxb6 Kd8 7.Kd4 +- (1.53) Depth: 8 00:12:38 401266kN (Blass, Tel-aviv 16.10.2001) New position 4k3/pppppppp/8/PPPPPPPP/4K3/8/8/8 w - - 0 1 Analysis by Chess Tiger 14.0: 1.e6 dxe6 2.fxe6 fxe6 3.dxe6 g6 4.hxg6 hxg6 5.Kd5 ² (0.34) Depth: 6 00:00:00 62kN 1.Kf4 Kd8 2.d6 cxd6 3.exd6 exd6 4.cxd6 ² (0.70) Depth: 6 00:00:00 70kN 1.Kf4 Kd8 2.Ke3 b6 3.cxb6 cxb6 4.e6 fxe6 5.axb6 axb6 6.dxe6 = (0.20) Depth: 7 00:00:00 114kN 1.e6 dxe6 2.fxe6 fxe6 3.Ke5 exd5 4.Kxd5 a6 5.bxa6 c6+ 6.Ke6 bxa6 ² (0.30) Depth: 7 00:00:00 131kN 1.Kd4 g6 2.c6 bxc6 3.dxc6 dxc6 4.fxg6 fxg6 5.hxg6 hxg6 6.bxc6 ² (0.34) Depth: 7 00:00:01 183kN 1.Kd4 g6 2.c6 bxc6 3.dxc6 dxc6 4.fxg6 fxg6 5.hxg6 hxg6 6.bxc6 ² (0.34) Depth: 8 00:00:01 238kN 1.Kd4 g6 2.fxg6 fxg6 3.hxg6 hxg6 4.d6 cxd6 5.exd6 exd6 6.Kd5 dxc5 7.Kxc5 = (0.22) Depth: 9 00:00:02 434kN 1.Kd3 Kd8 2.Kd4 Ke8 3.Ke4 g6 4.hxg6 hxg6 5.e6 dxe6 6.dxe6 gxf5+ 7.Kxf5 ² (0.42) Depth: 9 00:00:06 927kN 1.Kd3 Kd8 2.Kd4 Ke8 3.Ke4 g6 4.hxg6 hxg6 5.e6 dxe6 6.dxe6 gxf5+ 7.Kxf5 ² (0.42) Depth: 10 00:00:08 1289kN 1.Kd3 Kd8 2.Kc4 Ke8 3.c6 bxc6 4.bxc6 dxc6 5.Kc5 cxd5 6.Kxd5 g6 7.fxg6 fxg6 8.hxg6 hxg6 ² (0.36) Depth: 11 00:00:18 2865kN 1.Kd3 Kd8 2.Kc4 Ke8 3.c6 bxc6 4.bxc6 d6 5.exd6 exd6 6.Kb5 f6 7.Ka6 Kd8 8.Kxa7 ² (0.44) Depth: 12 00:00:35 5959kN 1.Kd3 ± (1.34) Depth: 13 00:01:15 13213kN 1.Kd3 Kd8 2.f6 exf6 3.g6 fxg6 4.h6 gxh6 5.exf6 d6 6.b6 cxb6 7.c6 bxc6 ± (1.35) Depth: 13 00:01:17 13613kN 1.Kd3 g6 2.e6 b6 3.axb6 axb6 4.cxb6 cxb6 5.exf7+ Kxf7 6.fxg6+ hxg6 7.h6 d6 8.Kd4 Kf8 9.Ke3 Kf7 10.Ke4 +- (2.24) Depth: 14 00:02:18 25407kN 1.Kd3 g6 +- (2.24) Depth: 15 00:03:55 43907kN (Blass, Tel-aviv 16.10.2001) yace has no problem to see the win some plies after the root position New position [D]4k3/p2ppppp/ppP5/3PPPPP/4K3/8/8/8 b - - 0 1 Analysis by Yace 0.99.56: 3...dxc6 4.dxc6 -+ (-1.45) Depth: 1 00:00:03 3...g6 -+ (-1.60) Depth: 1 00:00:03 3...h6 -+ (-1.62) Depth: 1 00:00:03 3...b5 -+ (-1.71) Depth: 1 00:00:03 3...a5 -+ (-1.81) Depth: 1 00:00:03 3...a5 4.c7 b5 ± (1.12) Depth: 2 00:00:03 3...a5 4.c7 b5 5.c8Q# +- (7.19) Depth: 2 00:00:03 3...a5 4.c7 b5 +- (7.19) Depth: 2 00:00:03 3...g6 4.c7 gxf5+ 5.Kxf5 µ (-0.79) Depth: 2 00:00:03 3...dxc6 4.dxc6 -+ (-1.45) Depth: 2 00:00:03 3...Kd8 4.g6 -+ (-1.49) Depth: 2 00:00:03 3...Kd8 4.Kd4 -+ (-1.49) Depth: 2 00:00:03 3...Kd8 4.e6 fxe6 5.fxe6 -+ (-1.69) Depth: 3 00:00:03 3...Kd8 4.e6 fxe6 5.fxe6 -+ (-1.69) Depth: 4 00:00:03 3...dxc6 4.dxc6 a5 5.Kd5 b5 -+ (-1.72) Depth: 4 00:00:03 3...dxc6 4.dxc6 e6 5.fxe6 fxe6 6.Kd4 a5 7.Kc4 Kd8 8.Kb5 -+ (-1.87) Depth: 5 00:00:04 5kN 3...dxc6 4.dxc6 a5 5.h6 gxh6 6.f6 e6 7.gxh6 b5 8.c7 Kd7 -+ (-1.80) Depth: 6 00:00:04 274kN 3...Kd8 4.e6 fxe6 5.fxe6 dxe6 6.g6 hxg6 7.Ke3 b5 8.hxg6 a5 9.Kd4 a6 10.d6 -+ (-1.81) Depth: 6 00:00:05 829kN 3...Kd8 4.Kd4 dxc6 5.dxc6 Kc7 6.Kd5 e6+ 7.fxe6 fxe6+ 8.Kxe6 Kxc6 -+ (-2.26) Depth: 6 00:00:06 1343kN 3...Kd8 4.h6 gxh6 5.e6 fxe6 6.dxe6 hxg5 7.cxd7 g4 8.Ke5 g3 9.f6 g2 10.f7 g1R 11.f8Q+ Kc7 -+ (-1.86) Depth: 7 00:00:11 3983kN 3...Kd8 4.h6 g6 5.c7+ Kxc7 6.e6 f6 7.fxg6 f5+ 8.Kxf5 µ (-0.89) Depth: 7 00:00:13 5084kN 3...dxc6 4.dxc6 a5 5.h6 g6 6.c7 gxf5+ 7.Kf3 Kd7 8.g6 fxg6 9.c8R µ (-0.90) Depth: 7 00:00:14 5603kN 3...dxc6 4.dxc6 a5 5.h6 g6 6.fxg6 fxg6 7.Kd3 b5 8.Kd4 Kd8 9.Kd5 -+ (-1.93) Depth: 7 00:00:15 5603kN 3...dxc6 4.dxc6 Kd8 5.h6 e6 6.fxe6 f6 7.gxf6 gxh6 8.c7+ Kxc7 9.e7 Kd7 10.e8Q+ Kxe8 11.e6 a5 12.f7+ Ke7 13.Ke5 -+ (-1.53) Depth: 8 00:00:18 7087kN 3...dxc6 4.dxc6 a5 5.h6 gxh6 6.e6 Kf8 7.exf7 e6 8.fxe6 Kg7 9.f8Q+ Kxf8 10.gxh6 Ke8 ³ (-0.53) Depth: 8 00:00:18 7087kN 3...dxc6 4.dxc6 Kd8 5.h6 g6 6.e6 f6 7.c7+ Kc8 8.fxg6 f5+ 9.Kxf5 ± (1.20) Depth: 8 00:00:22 9133kN 3...dxc6 4.dxc6 a5 5.h6 f6 6.exf6 a4 +- (1.60) Depth: 9 00:00:38 17838kN 3...dxc6 4.dxc6 b5 5.h6 gxh6 6.e6 fxe6 7.f6 hxg5 8.f7+ Kxf7 9.c7 a5 10.c8Q a4 11.Qa6 e5 12.Qxa7 h6 +- (2.60) Depth: 9 00:00:39 17838kN 3...dxc6 4.dxc6 a5 5.h6 gxh6 6.c7 Kd7 7.g6 fxg6 8.f6 exf6 9.exf6 Kxc7 10.f7 a6 11.f8Q h5 +- (3.59) Depth: 9 00:00:49 22813kN 3...dxc6 4.dxc6 a5 5.f6 gxf6 6.e6 fxe6 7.g6 hxg6 8.hxg6 a4 9.c7 f5+ 10.Ke5 Kd7 11.g7 Kxc7 12.g8Q b5 13.Qxe6 a6 +- (3.99) Depth: 10 00:01:23 39309kN 3...dxc6 4.dxc6 a5 5.f6 gxf6 6.e6 fxe6 7.g6 hxg6 8.hxg6 a4 9.g7 +- (4.02) Depth: 10 00:01:39 47023kN (Blass, Tel-aviv 16.10.2001) Uri
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