Author: Severi Salminen
Date: 03:05:38 02/28/01
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On February 28, 2001 at 05:56:36, Leen Ammeraal wrote: >I am not sure about when to avoid nullmoves. >I omit it: >a. when in check >b. when there are less than 5 pieces (including pawns) on the board >c. when the last move was a nullmove >d. at the root node >Should I also omit it in some other cases, >for example, when any hashmove (even with a low draft) was found, >or when beta = alpha + 1? I avoid it also when it seems that this node is futile: material+MARGIN<=alpha. It saved a few nodes and it seems to be quite sound assumption. Severi
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