Author: Mike Byrne
Date: 08:10:35 03/14/05
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On March 14, 2005 at 11:09:23, Mike Byrne wrote: >On March 14, 2005 at 10:05:24, Robert Hyatt wrote: > >>On March 14, 2005 at 09:32:55, Renze Steenhuisen wrote: >> >>>Hi all, >>> >>>can anyone tell me whether there has ever been a study on the actual needed >>>aspiration window sizes? The only thing I am only reading is that "it is common >>>knowledge" and "it is known" concerning Aspiration Windows. And Crafty is using >>>0.40*PAWN_VALUE because it seemed to perform best. But is there actual data >>>somewhere? >>> >>>Cheers! >>> >>>Renze >> Oops, my repsonse was for Renze and not for you Bob. I know I am not telling you anything new. >> >>That is "actual data". Take your program, and try different values, over a >>large test set of positions. Find the range that produces the greatest average >>search depth for the test set. It will vary for each program, since the >>evaluation functions can produce wildly variable scores... > >Not only is very program different , but even different versions of the smae >program. When a program has a solid a evalualtion, I think you can make it >tighter -- I have often used .35 with different versions of Crafty. In fact I >think that may have been the Crafty standard earlier). > >Also if you tone down the positional points available, you can also tighten up >the window. > >To answe your question, I don;t beleive there is published data, but I suspect >some of the professional programmers have their own data and for obvious reason >are not in a position to share.
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