Author: Leen Ammeraal
Date: 09:41:43 02/28/01
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On February 28, 2001 at 06:05:38, Severi Salminen wrote: >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 Thanks. Could you please tell me how much is MARGIN? For example, is it about two pawns? And I assume that, in the above condtion, 'material' is the result of a Static Exchange Evaluator, not just the current material balance, since that would be wrong when we are in the middle of a swap-off sequence. Leen
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