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Subject: Re: True Ratings

Author: Michael Yee

Date: 06:44:00 01/05/04

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On January 05, 2004 at 08:51:39, Ted Summers wrote:

>If a program, any program (like X3D Fritz) plays some positions like a 2700+
>player and other positions like a 1600 or 1700 player what would you say it's
>true rating should be? I am asking because of the 3rd game of the Kasparov vs.
>X3D Fritz match. In human games I don't think that their is such a huge gap in
>how a human would play a open position verus how they would play a closed
>position in terms of chess strength for example. However in computer chess this
>seems to be very normal. So I don't see how we can say that a program is 2700+
>when it plays some positions and as such weak player in other positions. Granted
>in tactics they are a GrandMaster, however in strategy they are maybe a grade A
>(1900) player. These are my thoughts, interested in hearing yours.
>
>Thanks
>Ted Summers

Perhaps you need to factor in the ability of the program to get the types of
positions it likes. For example, suppose Program X has "strength" 2800 in type A
positions and 2000 in type B positions. And suppose that X can force type A
positions about 75% of the time. Then the "expected" (overall) strength would be
about 2800 * 0.75 + 2000 * 0.25 = 2600.

Michael



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