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Subject: Re: Pouring oil on the fire

Author: Bruce Moreland

Date: 11:02:48 06/16/01

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On June 16, 2001 at 05:19:11, Alberto Rezza wrote:

>Obviously any comparison between the Elo ratings of, for instance, Capablanca
>and Kasparov, obtained in this way, won't be very reliable. But the same is true
>when comparing games from the same time: Kasparov and Mr. Nobody (1700 Elo), who
>only ever played in his hometown, do *not* play in the same pool of players.. :)

This is a real problem with people who don't play in the same pool.  There is,
for instance, the case that was a subject of wide discussion several years ago.

There was a prison inmate with a USCF rating, he played a bunch of other
prisoners with USCF ratings, and he ended up with one of the highest ratings in
the United States.

There was a lot of debate about how good he was, but it was hard to be sure
since he was in prison, so he couldn't play anyone from the outside.

That was very possibly a case of rating creep due to repeated play in a very
small pool.

I've often heard that ratings in different parts of the US are skewed, because
the same players play each other, and end up all getting over- or under-rated
somehow.

bruce



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