Author: Tord Romstad
Date: 01:23:12 04/07/04
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On April 07, 2004 at 04:17:43, José Carlos wrote: >On April 07, 2004 at 04:06:38, Tord Romstad wrote: > >>The following idea is still untested, but unless I am missing something it >>is guaranteed to reduce the number of nodes without any risk. The idea is >>fairly obvious, and I am sure some of you are already using it, but I still >>don't think it is widely known. >> >>At a node where the remaining depth is sufficiently big that a null move >>would not drop us directly into the qsearch, and beta > DRAW_SCORE, avoid >>doing a null move search if the move leading to the node was a reversible >>move. The point is that we know that the null move search is a waste of >>time in this case. After the null move, the opponent can just reverse >>his move, with a repetition draw score. >> >>Tord > > Maybe I don't understand you correctly, but I think side-to-move changes so no >repetition occurs. White to move, I play Ng1f3, you null-move, I play Nf3g1, but >now it's black to move. Yes, yes, you're right. I was stupid, as usual. :-( Tord
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