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Subject: Re: when to store nullmove failure in hashtable?

Author: martin fierz

Date: 13:41:01 09/27/04

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On September 27, 2004 at 16:36:33, Dan Honeycutt wrote:

>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.
>>
>
>I don't think you want to do that.  Just because the null move failed at the
>current depth doesn't mean it will fail later at a different depth.
>
>Dan H.

i know some people are doing this (among others bob), but i don't know exactly
when they do it, or why, and how much it helps. any answers are appreciated :-)

cheers
  martin



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