Author: Dave Gomboc
Date: 00:16:58 05/27/99
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On May 27, 1999 at 02:40:10, Peter Kappler wrote: > >Do any of you have any useful positions that you use for debugging your >hashtables? > >I've been trying this one, which I think is pretty well known: > >8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - bm Kb1; > > >Supposedly only Kb1 wins, but Grok likes Kb2. After 21 plies, the score jumps >above +2 as Grok sees the f5 pawn dropping. > >Genius 6 and Fritz 5.32 both like Kb1 and give it a winning score (+2.5 to +3.0) >immediately. > >I've seen this problem posted often enough that I trust that Kb1 is the only >winning move. So not only is Grok not finding the best move, but it seems to be >misevaluating Kb2. > >Does anybody else have problems with this position? > >Thanks, >Peter You might (hand-)generate the co-ordinate square map for this position. Then you will be able to look through the analysis of your program to see where it screws up from, working back from where white can pick up the f-pawn. Dave
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