Author: David Rasmussen
Date: 13:07:11 01/26/01
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On January 26, 2001 at 10:55:21, Severi Salminen wrote: > >>Inspired by the thread on extensions, I was wondering whether the idea of >>negative extensions or reductions could be a good one. >> >>I mean, maybe many of the "unsound" pruning methods would be sounder if, instead >>of just pruning, they just adjusted the resulting depth down. In that way, a >>line would still be examined, only later. > >Have you tried limited razoring as described by Ernst Heinz? So, if we are at >D=3 (distance to horizon) and material_balance+RAZOR_MARGIN<=alpha decrease >depth to 2: > >if((material()+MARGIN)<=alpha) > depth=2; > >Heinz suggests values of Queen - Queen+1 to be used as MARGIN. > >Severi I have tried limited razoring, but my idea was more general than that. There must be a thousand ways to guess if a move is bad, and then reduce depth accordingly. But this idea hasn't been explored yet.
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