Author: Andreas Herrmann
Date: 14:55:23 04/25/02
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On April 25, 2002 at 17:14:26, J. Wesley Cleveland wrote: >On April 25, 2002 at 13:26:19, Andreas Herrmann wrote: > >>On April 25, 2002 at 11:58:53, Russell Reagan wrote: >> >>>What is double null move? I assume it's playing two null moves one after >>>another, but how is it used to detect zugzwang? >>> >>>Russell >> >>The first null move is for detecting a zugzwang. This first nullmove you have to >>make with a reducing + 1. Excample: if your normal null move uses R=3 then use >>for the first detecting null move R=4. >>Only if the first null move responds a value >= beta then you do the second null >>move. >> > >I have not implemented this yet, so this is speculation. Do a normal nullmove. >If it fails low by a significant margin (.5 pawn ?), and you are not too near >the leaf, do a search without reversing colors, reducing the depth by R+2 (or >R+1). If this fails low (for the other side), you may have a zugzwang so do a >full search. It seems a good idea, i think i will try that tomorrow. I have just implemented a similar way on Danns idea and will first test this solution. Andreas
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