Author: John Merlino
Date: 14:17:04 06/27/02
Go up one level in this thread
On June 27, 2002 at 15:08:49, Andrew Dados wrote: >On June 27, 2002 at 14:53:55, John Merlino wrote: > >>On June 27, 2002 at 13:38:32, Ferdinand S. Mosca wrote: >> >>> >>>The king and pawn game is a very interesting exercise to program, is it >>>difficult to perfect this ending?. >>> >>>How long will it take your favorite programs to see that 36. h5 is good for >>>black. >>>[D]8/k6p/8/2P2p2/2P1p3/7K/1P3P2/8 b - - 0 35 >>>sample program analysis on Athlon xp 1600+, 64MB hash >>>Analysis by Gromit 3.8.2: >>> >>>36...h5 37.Kg3 Kb7 38.b3 Kc7 39.b4 Kc6 40.f4 Kc7 41.b5 Kb7 42.c6+ Kb6 43.c5+ Kc7 >>>44.Kh3 e3 45.Kg3 h4+ 46.Kg2 h3+ 47.Kf3 >>> ± (1.09) Depth: 18 00:10:55 >>>36...h5 >>> ± (1.09) Depth: 19 00:10:55 >>>36...h5 >>> ± (1.09) Depth: 19 00:11:09 >>> >>>more than 11 min, and yet the score still favors white. >>> >>> >>>Analysis by Green Light Chess 2.18: >>> >>>36...h5 37.Kg3 Kb7 38.b4 Kc6 39.f4 Kc7 40.b5 Kd7 41.c6+ Kd6 42.Kf2 h4 43.Kg2 e3 >>>44.Kf3 h3 45.Kxe3 h2 46.c5+ Kxc5 47.c7 Kxb5 48.c8Q h1Q 49.Qxf5+ >>> ± (1.27) Depth: 19 00:03:16 154355kN >>>36...h5 37.Kg3 Kb7 38.b4 Kc6 39.f4 Kc7 40.b5 Kd7 41.c6+ Kd6 42.Kf2 h4 43.Kg2 e3 >>>44.Kf3 h3 45.Kxe3 h2 46.c5+ Kxc5 47.c7 Kxb5 48.c8Q h1Q 49.Qxf5+ >>> ± (1.27) Depth: 19 00:03:17 155502kN >>> >>>still favors white. >>> >>>Regards, >>>Dinan >> >>Chessmaster 9000 chooses h5 after three seconds, but still believes White is >>winning after several minutes: >> >>Time Depth Score Positions Moves >>0:00 2/6 2.17 2478 1...Kb7 2.b4 Kc6 3.Kh4 f4 4.Kg4 >>0:00 3/7 3.10 6394 1...Kb7 2.Kg3 Kc6 3.b4 Kd7 4.Kf4 >> Ke6 5.b5 >>0:00 4/8 2.99 13077 1...Kb7 2.Kg3 Kc6 3.b4 Kd7 4.Kf4 >> Ke6 5.b5 h5 >>0:00 5/9 3.19 19013 1...Kb7 2.Kg3 Kc6 3.b4 Kd7 4.b5 >> Ke6 5.c6 Kd6 6.Kf4 >>0:00 6/10 2.14 43284 1...Kb7 2.b4 h5 3.b5 f4 4.c6+ Kc7 >> 5.Kg2 e3 6.Kf3 exf2 7.Kxf2 h4 8.c5 >>0:01 7/11 2.22 72473 1...Kb7 2.Kh4 Kc6 3.Kg5 Kxc5 4.b3 >> f4 5.Kxf4 Kd4 6.c5 Kxc5 7.Kxe4 >>0:01 8/12 2.89 133419 1...Kb7 2.Kh4 f4 3.Kg4 e3 4.fxe3 >> fxe3 5.Kf3 h5 6.Kxe3 h4 7.b4 h3 >>0:03 8/12 1.71 316053 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> exf3ep 5.Kxf3 h4 6.Kf2 f4 7.Kg2 >>0:05 9/13 1.91 505001 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> exf3ep 5.Kxf3 h4 6.Kf4 Kc7 7.b5 h3 >>0:14 10/14 1.87 1210094 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> exf3ep 5.Kxf3 h4 6.Kf4 Kc7 7.b5 >> h3 8.b6+ Kb7 >>0:30 11/15 2.19 2537703 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> exf3ep 5.Kxf3 h4 6.Kf4 Kc7 7.b5 >> Kb7 8.c6+ Kc7 9.c5 h3 >>1:37 12/16 1.94 7960434 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> Kc7 5.b5 Kb7 6.c6+ Kb6 7.Kg2 h4 >> 8.Kf2 h3 9.Kg3 e3 >>4:14 13/17 1.93 20726457 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> Kc7 5.b5 Kb7 6.c6+ Kb6 7.Kf2 h4 >> 8.c5+ Kc7 9.Kg2 e3 10.Kf3 h3 >>15:01 14/18 1.61 71024288 1...h5 2.Kg3 Kb7 3.b4 Kc6 4.f4 >> Kc7 5.b5 Kb7 6.c6+ Kb6 7.Kh4 Kc7 >> 8.Kh3 e3 9.Kg2 h4 10.Kf1 h3 11.c5 >> >>How can Black possibly win (or even draw) this game? >> >>jm > >In your last mainline cm gets into this position after 7. Kh4: >[D]8/8/1kP5/1P3p1p/2P1pP1K/8/8/8 b - - > >now 7... e3 seems to win quite simply for black. And that's why I'm not a very good chess player. I have discovered that CM9000 would have seen the win for Black if I had let the search go another ply or two. Thanks for the lesson, jm
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