Author: John Coffey
Date: 22:59:11 09/30/98
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On October 01, 1998 at 01:19:20, Jim Phillips wrote: >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 It was common even in the old days for programs to have selective extensions. (i.e. capture search.) for example, the Novag Super Constellation was at 1 ply a lot stronger than 750. It was more like 1300. So the question becomes are we talking about the maximum ply a program can look at? john Coffey
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