Author: Omid David
Date: 13:47:33 07/07/02
Go up one level in this thread
On July 07, 2002 at 16:36:57, Robert Hyatt wrote: >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. Yes, and today most programs use at least R=2... The fact is that new ideas in null-move pruning didn't cause this change of attitude, just programmers accepted taking more risks!
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