Author: Anthony Cozzie
Date: 08:51:45 05/06/04
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On May 06, 2004 at 11:38:44, Dan Honeycutt wrote: >Yet again I apologize for asking a question which I'm sure has been asked many >times before, but could someone explain the difference between a fail-hard and a >fail-soft and how does is affect a PVS search? > >I made the guess that, ie, if (score >= beta) if I return score it's a fail-hard >and if I return beta it's a fail-soft. It would seem that what I return doesn't >so much matter as what I put in the hash table. If I put in the (possibly) >higher value of score then I have a higher lower bound and a greater chance for >a hash cut if this position arises again. > >Thanks in advance. >Dan H. You understand it perfectly except for having it backwards. Fail hard: return beta on score >= beta Fail soft: return score on score >= beta Zappa is fail soft, just because it seemed more logical. anthony
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