Author: Bob Durrett
Date: 06:23:25 02/01/04
Go up one level in this thread
On February 01, 2004 at 08:26:39, Will Singleton wrote: >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. Maybe Crafty is a clone of Ruffian? : ) Bob D. >At >least running under winboard, the outputs look the same. > >My program, otoh, behaves like Fritz. :) > >Will
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