Author: Steven J. Brann
Date: 17:08:14 07/23/03
Go up one level in this thread
On July 23, 2003 at 15:24:18, Matthew White wrote: >[D]8/5p1k/6pp/8/q2QB3/2K4P/1p3P2/8 b - - 0 45 > >From Levin (2331) - IM Donaldson, Western States Open 2003 (analysis) >The move actually played was 45... Qa1? 46. Bxg6+!! and draw by perpetual check >Can your engine find the winning 45... b1=N+!! 46. Bxb1 Qa1+ and black enters >the endgame a pawn up > >Every engine that I have tested finds it eventually. However, some do take >longer than others :). > >Matt CM9000 (custom personality and SS=12) finds b1=N+ in a fraction of a second and stays with it. Time Depth Score Positions Moves 0:00 1/3 -1.27 2728 45...Qa1 46.Kc4 b1=Q 47.Bxb1 Qxb1 0:00 1/4 -1.27 8330 45...Qa1 46.Kc4 b1=Q 47.Bxb1 Qxb1 0:00 1/4 -1.36 9857 45...b1=N+ 46.Bxb1 Qa1+ 47.Kc4 Qxb1 48.h4 Qf5 0:00 1/5 -1.41 17701 45...b1=N+ 46.Bxb1 Qa1+ 47.Kc4 Qxb1 48.h4 Qc2+ 49.Kd5 Qf5+ 50.Kc4 0:00 1/6 -1.40 52486 45...b1=N+ 46.Bxb1 Qa1+ 47.Kc4 Qxb1 48.h4 Qc2+ 49.Kb5 Qf5+ 50.Kb4 f6 0:00 1/7 -1.37 97738 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qf5 49.h4 Qc2+ 50.Ke3 Qb3+ 51.Kf4 Qe6 0:00 1/8 -1.38 203194 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qa2+ 49.Kf3 Qe6 50.Kg2 Qf5 51.f3 f6 0:01 1/9 -1.44 435497 45...b1=N+ 46.Bxb1 Qa1+ 47.Kc4 Qxb1 48.h4 Qf1+ 49.Kb3 Qc1 50.Qf6 Qb1+ 51.Kc4 Qe4+ 52.Kc5 0:02 1/10 -1.46 834626 45...b1=N+ 46.Bxb1 Qa1+ 47.Kc4 Qxb1 48.h4 Qc2+ 49.Kd5 Kg8 50.Qf6 Qb3+ 51.Kc5 Qe6 52.Qd8+ Kh7 53.Qd4 0:05 2/11 -1.47 1707913 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qf5 49.Qc3 h5 50.Kf1 g5 51.Kg2 g4 52.h4 Qe4+ 53.Kg1 0:11 3/12 -1.49 3530375 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qf5 49.Qc3 h5 50.Kf1 f6 51.Kg1 Kg7 52.Qb3 Qe5 53.Kf1 0:24 4/13 -1.51 7954742 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qf5 49.Qc3 g5 50.Kf1 Kg6 51.Kg1 h5 52.Qe3 Qe6 53.Qc3 Qe4 0:57 5/14 -1.58 19426667 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qb3 49.h4 g5 50.Qe4+ Kg7 51.Qd4+ Kg8 52.hxg5 Qb5+ 53.Qd3 Qxg5 54.Qh3 Qb5+ 55.Ke1 Qb1+ 56.Kd2 Qb4+ 57.Ke2 2:16 6/15 -1.55 46329684 45...b1=N+ 46.Bxb1 Qa1+ 47.Kd3 Qxb1+ 48.Ke2 Qb3 49.h4 Qe6+ 50.Kd2 Qf5 51.f4 Qa5+ 52.Kd3 Qa3+ 53.Kd2 Qe7 54.Qd5 Kg8 55.Qa8+ Kg7 56.Qa1+ Qf6 Steve
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.