Author: James Swafford
Date: 09:23:57 05/15/99
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On May 15, 1999 at 01:03:21, Dave Gomboc wrote: >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 I've never heard of recursive null moves. :-) Perhaps you could try it and share your results? :-)) -- James
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