Author: José Carlos
Date: 01:17:43 04/07/04
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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. José C.
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