Author: Steve Maughan
Date: 05:56:36 12/15/00
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On December 14, 2000 at 06:50:45, Steve Maughan wrote: >My program doesn't use fail soft atr the moment but I have been reading about it >on the web. I hadn't realised that with fail soft the score, if less than >alpha, is an upper bound and if greater than beta is a lower bound. I can see >that this would be useful - but how useful is it in practice? > >A couple of things I can think of doing if this is the case: > >1) Back up the hash score with the returned value as the bound and NOT alpha or >beta. This would give more hash cutoffs but is it accurate when one has null >move & futility pruning etc? > >2) Use the score as a better bound for a fail high - obvious but I can't see >anyone doing it. As an example Shredder 5 seems to fail high at +0.25 above >current score then +0.50 above current score. Surely if this fail soft property >is robust there must be a better way. > >Are all of these insights correct? > >Regards, > >Steve Maughan
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