Author: Sune Fischer
Date: 17:06:33 08/20/03
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On August 20, 2003 at 19:51:15, Christophe Theron wrote: >>Actually I think you are doing the same as Crafty, Crafty is using a mix of >>copying and undoing as well. >>The expensive stuff, hash key and rotated boards are copied back. >>The piece bitboards don't all need accessing, perhaps just 1 or 2 out of ~20, so >>for this undoing is faster. >> >>-S. > > > >Oh well... Last time I glanced at Crafty I think it was version 9.2 or >something... :) > > > > Christophe Well looking at it again I believe I was wrong, looks like Crafty does indeed unmake the rotated boards!? (not the hash keys though). That has to be a computational overhead, it must be for cache efficiency then. But even in a 10 ply search this would not require more than 4*8*10=320 bytes. -S.
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