Author: Jon Dart
Date: 08:56:22 01/09/03
Go up one level in this thread
On January 08, 2003 at 17:56:21, John Merlino wrote: >On January 08, 2003 at 16:30:38, Jon Dart wrote: > >>This position came up in an offline test game, Arasan 6.2 vs. Lambchop 10.88: >> >>[D] 1k6/q7/2Q5/r3pp2/6p1/8/5rPP/5RK1 w - - >> >>White can delay the inevitable with a series of checks, beginning with Qe8+, but >>eventually he will run out of checks and lose, I think. This is something that >>is typically hard for computers to see. Arasan (White) thought it was fine at >>this point. >> >>Crafty 18.10 fails low on this position at ply 13, but then it takes a long time >>to resolve the fail-low: I gave it 20 minutes on a Xeon 1.7GHz, and it was still >>searching. >> >>Pharaon gets a score of about -2.5 at ply 12, but it went up again on ply 13, >>and then like Crafty it just hangs at ply 14 for a really long time. >> >>--Jon > >On a relatively slow P3-733, Chessmaster 9000 says: > >Time Depth Score Positions Moves >0:00 1/3 -1.05 6233 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 > 4.Qb3+ Ka8 5.Rxf2 >0:00 1/4 -0.86 11407 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb7 > 4.Qb3+ Qb6 5.Qxb6+ Kxb6 6.Kxf2 >0:00 1/5 -0.91 24513 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kc5 > 4.Rc1+ Rc2 5.Rxc2+ Kb4+ 6.Kf1 Ra1+ > 7.Ke2 >0:00 1/6 -1.22 45695 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kc5 > 4.Rc1+ Rc2 5.Rxc2+ Kb4+ 6.Kf1 Ra1+ > 7.Ke2 Qg1 >0:01 1/7 -1.37 98187 1.Qe8+ Kc7 2.Qe7+ Kc6 3.Qe6+ Kb5 > 4.Qb3+ Kc5 5.Qe3+ Kc6 6.Qxf2 Qxf2+ > 7.Kxf2 Ra2+ 8.Kg1 >0:02 1/7 -1.17 141641 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Qd7 > 4.Qb6+ Ke7 5.Qxf2 e4 6.Qh4+ Ke6 > 7.Qh6+ Ke5 >0:03 1/8 -1.35 296127 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Qf7 6.Qxf7+ Kxf7 > 7.Kxf2 Ra2+ 8.Kg1 Ke6 9.Rc1 >0:07 2/9 -1.22 604348 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Qf7 6.Qh8+ Ke7 > 7.Qh4+ Ke6 8.Qxf2 Rd5 9.Rc1 >0:18 3/10 -1.27 1567157 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Qf7 6.Qd8+ Kg7 > 7.Qg5+ Kh7 8.Kxf2 Ra3 9.Kg1 >0:43 4/11 -1.18 3838943 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Qf7 6.Qd8+ Kg7 > 7.Qg5+ Kh7 8.Kxf2 Ra2+ 9.Kg1 Qa7+ > 10.Kh1 Qd7 >1:51 5/12 -1.14 9889643 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Qf7 6.Qd8+ Kg7 > 7.Qg5+ Kh7 8.Kxf2 Ra2+ 9.Kg1 Qa7+ > 10.Kh1 Qd7 11.Qh5+ Kg8 12.Qg5+ Kh8 >7:37 6/13 -1.15 41238547 1.Qd6+ Kc8 2.Qc6+ Kd8 3.Qd6+ Ke8 > 4.Qe6+ Kf8 5.Qf6+ Kg8 6.Qg6+ Qg7 > 7.Qe8+ Qf8 8.Qxf8+ Kxf8 9.Kxf2 > Kg7 10.Re1 Ra2+ 11.Kg1 Kf6 12.Kf1 > >It appears that, if Black wants to avoid the draw by perpetual, he needs to >sacrifice the f2 rook, going into the endgame up one pawn, which may or may not >be winnable. > >jm
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