Author: Vincent Diepeveen
Date: 12:57:04 01/30/02
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On January 30, 2002 at 14:20:36, David Rasmussen wrote: >On January 30, 2002 at 11:15:03, Gian-Carlo Pascutto wrote: > >>> >>>In 1998 and 1999 it was mentionned by direct postings from Hsu >>>and others that they only did a fullwidth search not a single form >>>of pruning as they disbelieved this, Bob has quoted that zillions of >>>times in these years. >> >>Bob'll have to be the reference on this, but I always understood they >>didn't use any form of pruning except for quiescent futility pruning, >>which is what I tested with. >> > >I don't think DB used FP in quiescence. it is pretty trivial thing to do futility pruning in qsearch, though incorrect. When DB was a beancounter in the true sense (deep thought) i am sure for a psq program with very small values for king safety (near to none) and doing little in eval in general there futility is definitely a smart thing to do. When then later the thing got some more speculative eval, i bet he didn't even test without FP for correctness. How can a no-rating guy measure the difference anyway, all they did were a few blitzgames against old rebel version short before it played kasparov. >/David
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