Author: Jim Phillips
Date: 22:19:20 09/30/98
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On September 29, 1998 at 21:02:06, Jim Phillips wrote: >On September 29, 1998 at 14:00:40, William H Rogers wrote: > >>Has anyone done any research on the ratings that a program has at different >>plys? >>I once saw a test of chess 4.7 and they had some preliminary ratings on their >>program at different ply levels. They could set the depth that their program >>would search, not necessarily based on time. >>bill > >Hi Bill, >There was an article in Scientific American in approximately 1990-1991 >which had a graph showing the play ratings of various chess programs and >how many plies deep they searched. I don't have the article handy here; >I would have to dig it up. But I do remember definitely that the graph >implied that a program's rating increased by 180-200 points for each ply >deeper it searched. >It was displayed as a straight-line graph. I don't know if that's right >or wrong; it's certainly debatable. >-Jim Phillips Bill, I dug out that article when I got home and took a careful look at the graph. It's linear all the way from beginner up to 2000+ rating.... I assume it is for programs with a lot of knowledge, playing at 40/120 time control. I determined that a best-fit formula to duplicate the graph is: U.S. Chess Federation Rating = (200 x Ply Depth) + 550 This could be applied to your idea in your other post for a computer program that rates its human opponent. I've had some other ideas about that since reading your post; if I come up with a general approach I'll post it. Such a program would certainly be a worthwhile project... very interesting if nothing else.... -Jim Phillips
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