Author: Uri Blass
Date: 14:35:54 05/21/02
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On May 21, 2002 at 16:26:04, Robert Hyatt wrote: >On May 20, 2002 at 14:47:24, Eric Baum wrote: > >> >>OK then: >>(1) How much have computer programs benefitted from additional >>features? Remove all additional features from the top programs >>except material/piece-square table, and how many rating points would you lose? >>I'm guessing less than 100, but do you have another estimate? > >No idea. For Crafty, all improvements over the last 3+ years have >been _exclusively_ in the evaluation. I haven't changed the search >at all... > > >> >>(2) Are there any programs with significant ability to discover new >>features, or are essentially all the features programmed in by hand. >>If you believe there are programs that discover useful new features, >>how many rating points do you think they have gained? >>And can you give me some idea of what type of algorithm was used? > >You are talking about "learning" as humans do it (discover new features). >I don't know of _any_ program that does this. Some use pre-defined features, >but twaddle with the weights associated with them. But that is very crude >in comparison to human learning. > > > >> >>Also, for comparison, does anybody have a recent estimate of rating >>point gain per additional ply of search? > >50-70 seems to be current value... has been for years too... 50-70 is the advantage for doubling the speed of the computer but programs have brancing factor that is bigger than 2 so it means more than 50-70 per additional ply. Uri
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