Author: Chua Kong Sian
Date: 00:34:42 02/29/00
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On February 29, 2000 at 03:19:00, Bas Hamstra wrote: >On February 29, 2000 at 01:34:48, Sanjiv Karnataki wrote: > >>Hi All, >> >>I just finished reading Ernest Heinz's article on the subject and I had a >>question about the code sample. It uses a routine called "try_null" that is not >>given in the article and the only thing the article says is "tries to avoid >>superfluous null-move searches that do not really promise to cut off as decided >>by the function try_null" >> >>Does anyone know how that decision could be made? I was thinking of trying it in >>my program. >> >>Thank you >> >>Sanjiv. > >For instance if material is more than PawnValue below Alpha,chances are there >will be no cutoff. Not perferct of course. Another possible idea is if a hash table probe for this position yields an upper bound (meaning that the last time this pos was search, it failed low), then skip the null test. Also not perfect, mileage varies. Kong Sian
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