Author: Bas Hamstra
Date: 02:32:04 09/08/99
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On September 07, 1999 at 22:52:10, William Bryant wrote: >I was reviewing my code, and noted in the root search when the score obtained >is > alpha (and < beta) I was doing the following: > >alpha = score; >beta = alpha + WindowSize; > >I thought this idea came from Crafty, but now I can't find it in the Crafty >source. Further, although it makes the initial ply's slightly slower, it speeds >up the search overall and improves the LCTII score as well. I think I have seen it in Crafty too. As wel as in several other programs. >Question: > Is there any harm in updating beta to the aspiration window size at the root >when a score is backed up to the root and alpha is changed? > > Is this idea good, bad, neither? > > Did this come from Crafty at one point? Personally I don't see how it could possibly do any harm. The way I see it: if there can be won material it's not much faster than without aspiration window. However is there is *no* combination ahead, it *is* faster. Anyway: aspiration window or not should give the same score. If it is taken out of the Crafty source I would be surpised... Regards, Bas Hamstra. > >William >wbryant@ix.netcom.com
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