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Subject: Re: Ratings - How they change over the years

Author: Howard Exner

Date: 14:25:00 01/21/01

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On January 21, 2001 at 10:57:02, John Wentworth wrote:

>I just dug up an old printed version of the Computer Chess Reports that I
>received back in April 1996. Here are some ratings back then and what they are
>today:
>
>
>                         (April 1996)            (Today)
>M-Chess Pro 5.0         2622(486/50-66)        2306  (P90)
>Genius 3.0		2613(486/50-66)        2308  (P90)
>Rebel 7			2600(486/50-66)        2301  (P90)
>Rebel 6			2597(486/50-66)        2196  (486/50-66)
>Chessmaster 4000	2539(486/50-66)        2191  (486/50-66)
>
>Look how much higher the ratings were even though they were on much slower
>machines then how they are showed now.
>
>I guess I will be really interested  to see four years from now, if Fritz6 and
>all the other top ones will be down around the 2400 mark. Obviously ratings are
>not an exact science or measurement, but it's funny to see how they change over
>initial estimates and then again several years later. Makes me doubt any rating
>I see on the latest and greatest programs.

The CC reports often posted the USCF equivalent of the Swedish rating. I recall
they added 200 points to the ssdf list. Also the SSDF rolled back 100 points
awhile back. That accounts for the roughly 300 rating difference between then
and now.

Others can verify if my memory on this is accurate as I'm not 100% sure..





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