Author: John Merlino
Date: 16:02:49 05/27/02
Go up one level in this thread
On May 27, 2002 at 14:31:16, Bo Sjögren wrote: >Many years ago I was outplayed for most of the game, but my opponent >allowed me to "close the shop": > >[D]8/p7/6kp/1p2p3/1P2P2P/2P5/1P3K2/8 w - - > >White must play 1.h5+!, which I think we concluded after the game wins >rather easily. But instead he played 1. b3?? and after 1...h5! he >thought for five minutes, and shook his head (and my hand)... > >Does the current crop of engines recognise the danger? It seems CT14 >prefers 1.h5+, but is almost as happy with 1.b3 -- just a one minute >check. Will any engine conclude that 1.b3 is indeed a draw, and how >will it do it; by some kind of intelligence, or brute force? (I of >course have the feeling that brute force is not enough for this type >of problem.) > >/Bo S Chessmaster 9000 (Beta version, on a PIII-733) prefers 1.h5+ after only 11 seconds, but it takes seven minutes to see the win: Time Depth Score Positions Moves 0:00 11/12 2.34 66841 1.b3 a6 2.c4 h5 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc6 0:01 12/13 2.28 117675 1.b3 a6 2.c4 h5 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc6 7.Ke3 0:01 13/14 2.34 214276 1.b3 a6 2.c4 h5 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc7 7.Ke3 Kc6 0:02 14/15 2.28 284441 1.b3 a6 2.c4 h5 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc7 7.Ke2 Kc6 8.Ke3 0:02 15/16 2.25 406320 1.b3 a6 2.c4 h5 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc7 7.Ke2 Kd7 8.Kf3 Kc6 9.Ke3 0:04 16/17 2.25 649696 1.b3 a6 2.c4 h5 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc7 7.Ke2 Kd7 8.Kf3 Kc6 9.Ke3 0:07 17/18 2.29 1057992 1.b3 h5 2.c4 a6 3.c5 Kf6 4.Ke3 Ke6 5.Kd2 Kd7 6.Kd3 Kc7 7.Ke2 Kd7 8.Kf2 Kc7 9.Ke3 Kc6 0:11 17/18 2.32 1588450 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf6 8.Kxh6 Ke7 9.Kg5 Ke6 10.c6 0:17 18/19 2.42 2413985 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf6 8.Kxh6 Ke7 9.Kg5 Ke6 10.Kg4 a6 11.Kf3 0:28 19/20 2.37 4052112 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf6 8.Kxh6 Ke7 9.Kg5 Ke6 10.Kh4 Kf6 11.Kg4 Ke6 0:46 20/21 2.42 6280418 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf6 8.Kxh6 Ke7 9.Kg5 Ke6 10.Kh4 Kf6 11.Kg3 Ke6 12.Kf3 1:22 21/22 2.40 10816104 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf7 8.Kxh6 Kf6 9.Kh5 Kf7 10.Kg4 Kf6 11.Kf3 Ke6 12.Ke3 Kd7 2:59 22/23 2.40 22446854 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf7 8.Kxh6 Kf6 9.Kh5 Kf7 10.Kg4 Kf6 11.Kf3 Ke6 12.Ke3 Kd7 7:00 23/24 4.55 50692165 1.h5+ Kxh5 2.Kg3 Kg6 3.Kg4 Kf6 4.b3 Kg6 5.c4 Kf6 6.c5 Ke6 7.Kh5 Kf7 8.Kxh6 Kf6 9.Kh5 Ke6 10.Kg5 a6 11.Kg6 Ke7 12.Kf5 Kd7 13.Kxe5 After forcing 1.b3 h5, there was a massive fail-low at depth 32, but it didn't seem to resolve anything earth-shattering: Time Depth Score Positions Moves 0:00 15/16 2.29 68898 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kc2 Kc6 8.Kc3 Kc7 9.Kd3 Kc6 0:00 16/17 2.23 89287 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Kc3 Kc6 9.Kc2 Kc7 10.Kd3 Kc6 0:01 17/18 2.29 123627 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 0:01 18/19 2.07 156692 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kc3 Kc6 0:01 19/20 2.07 211272 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kc3 Kc6 0:02 20/21 2.02 266358 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Kf3 Kd7 10.Kg2 Kc6 11.Kf2 Kd7 12.Kf3 Kc6 0:02 21/22 2.05 348152 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Ke7 9.Kd3 Kd7 10.Kd2 Kd8 11.Kc3 Kd7 12.Kc2 Kc6 13.Kd3 0:03 22/23 1.97 442939 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kc2 Kc7 13.Kc3 Kc6 0:04 23/24 1.89 574365 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kc3 Kc7 13.Kc2 Kd7 0:05 24/25 1.89 758414 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Ke1 Kd7 13.Kf2 Kc6 14.Kf3 0:08 25/26 1.89 1085238 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Ke6 12.Ke1 Ke7 13.Kf1 Ke6 14.Kg2 Kd7 15.Kf3 0:13 26/27 1.87 1668251 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kd1 Kd7 13.Ke1 Kc6 14.Kf2 Kd7 15.Kf3 Kc6 0:22 27/28 1.87 2689492 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kd1 Kd7 13.Ke1 Kc6 14.Kf2 Kd7 15.Kf3 Kc6 0:38 28/29 1.80 4552055 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kc2 Kc7 13.Kd1 Kc6 14.Ke1 Kd7 15.Kf2 Kc6 16.Kf3 1:18 29/30 1.82 9134019 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kc2 Kc7 13.Kd1 Kd7 14.Ke1 Kc6 15.Kf2 Kd7 16.Kf3 Kc6 2:28 30/31 1.77 17112780 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kc2 Kc7 13.Kd1 Kc6 14.Ke1 Kd7 15.Kf2 Kc6 16.Kg3 Kd7 17.Kf3 13:22 31/32 1.77 87331599 2.c4 a6 3.c5 Kf6 4.Ke3 Ke7 5.Ke2 Kd7 6.Kd3 Kc7 7.Kd2 Kd7 8.Ke2 Kc6 9.Ke3 Kc7 10.Kd3 Kd7 11.Kd2 Kc6 12.Kc3 Kc7 13.Kc2 Kc6 14.Kd1 Kd7 15.Ke1 Kc6 16.Kf2 Kd7 17.Kf3 jm
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