Author: Pallav Nawani
Date: 00:30:59 09/28/04
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On September 27, 2004 at 15:32:05, martin fierz wrote: >aloha! > >i just tried the following in my program: > >if a nullmove was tried and it failed, i saved a "nonull"-flag in my hashtable. >when i got a hash hit, i checked whether nonull was set or not, if it was not >set i did not attempt a nullmove. > >this seemed rather sensible to me - but it ended up searching about 5% more >nodes on a fixed depth test suite. > >where did i go wrong? should i only hash nonull if i detect a mate threat?? > Yes. When you detect a mate threat, hash the threat. When you revisit that position again, Don't NULL move, but you may wish to extend. Regards, Pallav
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