Author: Uri Blass
Date: 13:32:47 04/17/02
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On April 17, 2002 at 16:09:27, Dann Corbit wrote: >On April 17, 2002 at 15:43:23, Jesus de la Villa wrote: > >> >>Have someone defined the general rule(s) where null move >>is unable to find simple combinations?, and if so, which >>are those rules ? >> >>"Obviusly" is more expensive to check it than to not >>use Null Move. > >There are times you simply must turn null move off or disasters will happen. > >When the board gets sparse, turn it off. > >If you are in check, turn it off. > >If you are already searching with null move, additional null move pruning [for >subsequent plies] is questionable. > >If you see a checkmate threat during the null move search, turn it off or >extend. > >Null move will not remove the ability to find simple combinations. It only >delays it. But it might delay it enough that you will not find it in a >reasonable time. Null move may removes the ability to find simple combinations when zunzwang is involved. It happens to a lot of programs that do not use zunzwang detection(I think that crafty is one of them and at least it was the case in the latest version that I checked). Uri
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