Author: Uri Blass
Date: 13:36:33 07/16/04
Go up one level in this thread
On July 16, 2004 at 16:17:59, Rémi Coulom wrote: >Hi, > >This position is taken from the ParSOS - The Crazy Bishop game: >[D]8/p6p/1p2kBp1/2p5/2P5/P4P2/P3nK1P/8 b - - > >During the game, GM Boris Alterman commented that Kxf6 Kxe2 leads to a won pawn >endgame for black. My program does not manage to evaluate this pawn endgame as a >win, even after a very long search. Can you explain if/how it is a win ? I think that it is some generaliztion that humans do because they know that in this kind of position black win. All the white pawns are isolated and weak when all the black pawns are connected. White has no passed pawns and no candidate and the conclusion is that white has no chance. Did you try to play the pawn endgame with crazybishop against itself and found that even at long time control it is a draw? Here is some analysis by yace on A3000(512 mbytes hash) after the forced line Kxf6 Kxe2 and you can see that Ke5 fails high again and again. ParSOS - Crazy Bishop [D]8/p6p/1p3kp1/2p5/2P5/P4P2/P3K2P/8 b - - 0 1 Analysis by Yace 0.99.87: 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 1 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 1 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 2 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 2 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 3 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 3 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 4 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 4 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 5 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 5 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 6/1 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 6/1 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 7/1 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 7/1 00:00:00 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 8/1 00:00:01 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.56) Depth: 8/1 00:00:01 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.85) Depth: 9/26 00:00:02 3636kN 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.Kf2 g4 50.fxg4 Kxg4 51.Ke3 Kh3 52.Kf4 Kxh2 53.Ke5 -+ (-1.85) Depth: 9/27 00:00:04 7386kN 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.a3 g4 50.fxg4 Kxg4 51.Kd3 Kh3 52.Ke4 Kxh2 53.Kf4 Kg2 -+ (-1.99) Depth: 10/30 00:00:10 16444kN 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.a3 g4 50.fxg4 Kxg4 51.Kd3 Kh3 52.Ke4 Kxh2 53.Kf4 Kg2 -+ (-1.99) Depth: 10/30 00:00:17 27418kN 44...Ke5 45.Ke3 g5 46.a4 a5 47.Kd3 Kf4 48.Ke2 h6 49.a3 h5 50.Kf2 Ke5 51.Ke3 Kf6 52.Kd3 b5 53.cxb5 Ke5 54.Ke2 Kd6 55.h3 c4 56.f4 gxf4 57.Kf2 c3 58.Ke2 Ke6 59.b6 c2 60.b7 -+ (-1.59) Depth: 11/33 00:00:33 52932kN 44...Ke5 45.Kd3 a6 46.a4 Kf4 47.Ke2 a5 48.Kf2 h5 49.Ke2 h4 50.Kf2 Ke5 51.Ke3 g5 52.Kd3 Ke6 53.Ke3 b5 54.cxb5 Kd6 55.Kd3 Kc7 56.a3 Kd6 57.h3 Kc7 58.b6+ Kxb6 59.Kc3 Kc7 60.Kc4 -+ (-1.52) Depth: 11/33 00:01:00 95653kN 44...Ke5 45.Kd3 a6 46.a4 Kf4 47.Ke2 a5 48.Kf2 h5 49.Ke2 h4 50.Kf2 Ke5 51.Ke3 g5 52.Kd3 Ke6 53.Ke3 b5 54.cxb5 Kd6 55.Kd3 Kc7 56.a3 Kd6 57.h3 Kc7 58.b6+ Kxb6 59.Kc3 Kc7 60.Kc4 -+ (-1.52) Depth: 11/33 00:01:41 160512kN 44...Ke5 45.Kd3 g5 46.a4 Kf4 47.Ke2 h6 48.Kf2 Ke5 49.Ke3 a5 50.a3 Kf5 51.Kd3 h5 52.Ke2 Kf4 53.Kf2 g4 54.h3 gxh3 55.Ke2 h4 56.Kf2 -+ (-1.54) Depth: 12/35 00:02:21 224042kN 44...Ke5 45.Kd3 g5 46.a4 Kf4 47.Ke2 h6 48.Kf2 Ke5 49.Ke3 a5 50.a3 Kf5 51.Kd3 h5 52.Ke2 Kf4 53.Kf2 g4 54.h3 gxh3 55.Ke2 h4 56.Kf2 h2 57.Kg2 h1Q+ 58.Kxh1 Kxf3 -+ (-1.54) Depth: 12/36 00:04:11 398413kN 44...Ke5 45.Kd3 g5 46.a4 Kf4 47.Ke2 g4 48.fxg4 Kxg4 49.Ke3 Kh3 50.Ke4 Kxh2 51.a5 h5 52.axb6 axb6 53.Kd5 h4 54.a4 h3 55.a5 bxa5 56.Kxc5 a4 -+ (-1.94) Depth: 13/37 00:04:44 451469kN 44...Ke5 45.Kd3 Kf4 46.Ke2 a5 47.a4 g5 48.Kf2 g4 49.fxg4 Kxg4 50.Ke3 Kh3 51.Kf4 Kxh2 52.Kg5 Kg3 53.Kh6 Kf4 54.Kxh7 Ke4 55.a3 Kd4 56.Kg6 Kxc4 57.Kg5 Kc3 58.Kg6 c4 59.Kf5 Kd4 60.Ke6 -+ (-2.47) Depth: 13/37 00:06:03 578245kN 44...Ke5 45.Kd3 Kf4 46.Ke2 a5 47.a4 g5 48.Kf2 g4 49.fxg4 Kxg4 50.Ke3 Kh3 51.Kf4 Kxh2 52.Kg5 Kg3 53.Kh6 Kf4 54.Kxh7 Ke4 55.a3 Kd4 56.Kg6 Kxc4 57.Kg5 Kc3 58.Kg6 c4 59.Kf5 Kd4 60.Ke6 -+ (-2.47) Depth: 13/38 00:09:42 929606kN 44...Ke5 45.Kd3 Kf4 46.Ke2 a5 47.a4 g5 48.Kf2 g4 49.fxg4 Kxg4 50.Ke3 Kh3 51.Kf4 Kxh2 52.Kg5 Kg3 53.Kh6 Kf4 54.Kxh7 Ke4 55.a3 Kd4 56.Kg6 Kxc4 57.Kf5 Kb3 58.Ke4 Kxa3 -+ (-2.87) Depth: 14/38 00:10:22 998141kN 44...Ke5 45.Kd3 Kf4 46.Ke2 g5 47.Kf2 g4 48.fxg4 Kxg4 49.a4 a5 50.Ke2 Kh3 51.Kf3 Kxh2 52.Kf2 h6 53.Kf3 Kh3 54.Kf4 Kg2 55.Kg4 -+ (-2.96) Depth: 14/39 00:13:21 1289372kN (, MyTown 16.07.2004) Uri
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