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Subject: Re: A theory of ratings drift for the SSDF

Author: Uri Blass

Date: 13:22:36 04/09/02

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On April 09, 2002 at 16:04:01, Dann Corbit wrote:

>I think it likely there is ratings drift for the SSDF.  Consider that for the
>most part, these programs do not learn.  So "what you see is what you get" no
>matter when you play them.  It is interesting to look over the programs on a
>given platform in this list.  It appears to be a general trend that the ratings
>have been pushed down over time.  Let's consider one example:
>Ch.Machine 30 MHz King 2.0 aggr/R30 off(1996) 2296   21   -21  1153   65%  2185
>Ch.Machine 30 MHz King 2.0 aggr/R30 off(1997) 2294   21   -20  1202   64%  2194
>Ch.Machine 30 MHz King 2.0 aggr/R30off (1998) 2293   21   -20  1202   64%  2193
>Ch.Machine 30 MHz King 2.0 aggr/R30off (1999) 2293   21   -20  1202   64%  2193
>Ch.Machine 30 MHz King 2.0 aggr/R30off (2000) 2195   21   -20  1219   63%  2099
>Ch.Machine 30 MHz King 2.0 aggr/R30off (2002) 2195   21   -20  1219   63%  2099
>
>It appears to have lost 100 ELO over the span from 1996 to 2195.  And yet it is
>the exact same hardware that was used over each test.

There is an obvious reason for it.
The ssdf decided to reduce all the numbers by 100 elo because the rating of the
top programs was too high.

Uri



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