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Subject: Re: Ply Ratings

Author: Jim Phillips

Date: 18:02:06 09/29/98

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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




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