Author: Will Singleton
Date: 05:26:39 02/01/04
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On February 01, 2004 at 04:38:31, Ricardo Gibert wrote: >On January 31, 2004 at 19:29:18, Jaime Benito de Valle Ruiz wrote: > >>I came across this position almost by accident. A few moves before this, my >>"poor engine" was giving a huge score for white in no time, while Ruffian >>sticked to draw. So I reanalized the whole thing. >>Why can't Ruffian 1.05 find an easy 1.Qd5 and win? Null move? Special Pruning? >> >>[d]Q7/8/1p1K4/1p6/2k5/8/1P6/4q3 w - - > >1.Qd5 Kb4 2.Qd3 puts Black in an amusing zugzwang. > >I don't know why your post has not attracted more attention. The position you >post is certainly more interesting than it appears at first blush. Since the >position does involve zugzwang, nullmove could be the culprit as you have >guessed, but only the programmer knows the real explanation for his programs >failure. > >I'm curious how other programs fair with this position. Ruffian 1.01 fails just >like Ruffian 1.05. This contrasts sharply with Fritz 8, which gets the solution >almost instantly with a huge plus score. > I can report that crafty 19.03 shows the identical behavior as ruffian. At least running under winboard, the outputs look the same. My program, otoh, behaves like Fritz. :) Will
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