Author: Dave Gomboc
Date: 22:03:21 05/14/99
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On May 15, 1999 at 00:47:12, James Swafford wrote: >On May 15, 1999 at 00:34:35, Dave Gomboc wrote: > >>On May 14, 1999 at 20:10:09, William Bryant wrote: >> >>>I'm ready to ruin a perfectly good search by adding more code. If done right, >>>the Null move should make it much stronger. My copy of C. Donningers paper has >>>been ordered by inter library loan so I have not yet read the paper. Below is a >>>summary or digest of information available from this forum over the last year >>>concerning null moves. >>> >>>I think this is a pretty up to date summary of the heuristic, but would >>>appreaciate any comments. >>> >>>Note: I have assembled this from many posts, maybe even yours. I claim no >>>copyright on the material. For those, like me, ready to expand their programs >>>with Null move search, I hope this summary helps. Please feel free to correct >>>any errors I might have made. >>> >>>William >>>wbryant@ix.netcom.com >>> >>>Null Move Summary >>> >>>Description >>> Null moves are a forward pruning mechanism to generate a beta cutoff without >>>doing a full search >>> >>>Situations to Avoid Null Moves >>>1. When the side on move is in check. Then a null move simply allows the other >>>side to capture the King. >>>2. Having just done a null move. >> >>I have heard this restriction before, but I have also heard that it is fine to >>do this, because one or the other null-move will fail. Does this make any >>sense? I have not spent much time thinking about it. >> >>Dave > > >Suppose you're in Search( ) with depth remaining=7. >Now you start a null search w/ a reduction of 2, so >you're in search again with depth=5. > >Now repeat. Repeat again. >Soon enough you're in quiescence, and you might as well >have set r to 7. > >-- >James Are recursive null-moves normally done without limit? I was under the impression that a maximum number per continuation were allowed. ?! Dave
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