Author: Robert Hyatt
Date: 13:36:57 07/07/02
Go up one level in this thread
On July 07, 2002 at 11:48:27, Omid David wrote: >On July 06, 2002 at 23:23:28, Robert Hyatt wrote: > >>On July 06, 2002 at 22:29:44, Omid David wrote: >> >>>On July 06, 2002 at 10:20:17, Robert Hyatt wrote: >>> >>>>On July 06, 2002 at 01:07:36, Ricardo Gibert wrote: >>>> >>>>> >>>>>Okay, but so what? >>>>> >>>>>> >>>>>>So perhaps the idea of "forward pruning" is foreign to us as well... >>>>> >>>>>I see no logical difference between deciding which moves are interesting and >>>>>worth looking at and deciding which moves are not interesting and not worth >>>>>looking at. It looks to me like 2 sides of the same coin, so your speculation >>>>>that "perhaps the idea of "forward pruning" is foreign to us as well..." does >>>>>not seem to be of any consequence. >>>>> >>>> >>>>However, that has been _the point_ of this entire thread: Is DB's search >>>>inferior because it does lots of extensions, but no forward pruning. I >>>>simply said "no, the two can be 100% equivalent". >>> >>>Just a quick point: The last winner of WCCC which *didn't* use forward pruning >>>was Deep Thought in 1989. Since then, forward pruning programs won all WCCC >>>championships... >> >> >>In 1992 no "supercomputer" played. In 1995 deep thought had bad luck and lost >>a game it probably wouldn't have lost had it been replayed 20 times. No >>"supercomputer" (those are the programs that likely relied more on extensions >>than on forward pruning due to the hardware horsepower they had) has played >>since 1995... >> >>I'm not sure that means a lot, however. IE I don't think that in 1995 fritz >>was a wild forward pruner either unless you include null move. Then you >>would have to include a bunch of supercomputer programs including Cray Blitz >>as almost all of us used null-move... > >I personally consider null-move pruning a form of forward pruning, at least with >R > 1. I believe Cray Blitz used R = 1 at that time, right? I believe that at that point (1989) everybody was using null-move with R=1. It is certainly a form of forward pruning, by effect.
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