Author: Richard Pijl
Date: 07:48:53 09/03/04
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On September 03, 2004 at 10:39:27, Tord Romstad wrote: >On September 03, 2004 at 10:20:38, Stuart Cracraft wrote: > >>My mate threat is broken. The null move before it is searching with >>a window of -beta+1,beta and Tord says he wouldn't do that. > >I think I should clarify this. In most programs, there is no reason >to use anything more than a minimal window in the null move search. >The code would resemble this: > > null_value = -search(-beta, -(beta+1), depth-(R+1)*PLY); > >I hope this is what you meant to say above, and that your -beta+1,beta >was a typo. I hope you meant to say -beta, -beta+1 :-) Richard. > >However, if you want to use the null move search to do Botvinnik Markoff >extensions or similar tricks, it might be a good idea to increase the >window size. This will make the null move search slightly more expensive, >but you will also get slightly more information back. The code would >look like this: > > null_value = -search(-beta, -alpha, depth-(R+1)*PLY); > >Tord
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