Author: Edward Screven
Date: 13:26:42 03/30/98
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On March 30, 1998 at 13:09:34, Jon Dart wrote: >Recently my program "Arasan" played a game on FICS against >"noro", and reached the following position: > >8/8/5R2/r5P1/8/p5P1/K5kP/8 b - - > >Here the computer played Rxg5 and eventually lost. It appears >that Kxh2 draws (Crafty finds Kxh2 right away. The analysis >goes Kxh2 g6 Rg5 Kxa3 Kxg3 Kb4 Kg4 Kc4 Kh5 Kd4 Rxg6). > >This isn't really hard, but it helps if the program knows >the passed pawn is not dangerous even though the king is >behind it. It looks to me like Crafty has special case >code for just this ending (in EvaluatePassedPawns). >Genius 5.0 also likes Kxh2 after a short search. I'm >wondering if any other programs find this difficult. i think that as long as you don't misevaluate passed pawns, then solving this with a short search without any special knowledge should be easy. my own program settles on Kxh2 after about 4.5 seconds at 12 ply. i have an evaluation rule that detects uncatchable pawns, but i don't apply it if the chasing side has pieces, so it poses no problems here.
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