Author: John Merlino
Date: 14:56:21 01/08/03
Go up one level in this thread
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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