Author: Enrique Irazoqui
Date: 13:32:15 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. > >--Jon All programs I tried find Kxh2 under 3 minutes on a P150MMX/48. Rebel 9, 8 seconds, PV 0.00 Rh2 g6 Rg5 Rf3 Rxg6 Rxa3 Rxg3 Fritz 5, 5 seconds, -.69 Junior 4.6, 93 seconds, -.57 Hiarcs 6, 58 seconds, -.11 Mchess 7.1, 131 seconds, -1.11 Nimzo98, 20 seconds, -.82 Enrique
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