Author: Robert Hyatt
Date: 21:29:22 01/31/02
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On January 31, 2002 at 07:17:49, David Rasmussen wrote: >On January 30, 2002 at 23:23:34, Robert Hyatt wrote: > >>On January 30, 2002 at 14:18:47, David Rasmussen wrote: >> >>>On January 30, 2002 at 10:12:25, Gian-Carlo Pascutto wrote: >>> >>>>Why are you blindly assuming that their effective branching factor >>>>is 40, just because that is the average number of legal chess >>>>moves? You should know better. And I know you do. >>>> >>>>They used PVS. Aspiration windows. Hashtables for the first TWELVE >>>>plies. Even futility pruning. >>>> >>> >>>Futility pruning? I don't think so. Hsu hated futility pruning, even in >>>quiescence. >>> >>>/David >> >> >>They _definitely_ used futility pruning in the hardware part of the search. >>This was reported at several public presentations and was one of the features >>they turned off to slow the processor down in the famous DB vs the micros >>match... >> >>No idea if they used futility in the software search, but they definitely >>used it in the hardware part as per their discussions... > >OK, I didn't know that. A newsgroup thread between you and Hsu from around 1990 >seemed to indicate that he thought that your q-search FP was the reason of many >tactical mistakes, and that he considered it to be extremely unsound. So I >assumed it wasn't in DB. But hey, you live and learn. > >/David You are correct about the newsgroup discussion. However, it appears that he later "saw the light". :) I was surprised when I found out... but it is logical...
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