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Subject: Re: Rating

Author: M Hurd

Date: 11:38:08 01/19/06

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On January 19, 2006 at 10:44:00, Robert Hyatt wrote:

>On January 19, 2006 at 08:11:54, M Hurd wrote:
>
>>If you play an engine match of 1000 games against 1 engine and play another
>>match of 1 game each against 1000 engines, would you get the same rating ?
>>
>>Is it more important to play as many different engines as possible or just
>>number of games played.
>>
>>Presumably there will be an optimum number for games and number of engines
>>played.
>>
>>Regards
>>
>>Mike
>
>Not necessarily.
>
>The Elo system is designed to scale your rating, with respect to the rating of
>the opponents you play, such that your rating will provide a statistically
>accurate estimate of your expected result when playing any of those opponents.
>But ratings are all relative, not absolute.  If My rating is 200 points higher
>than yours, that means I ought to win about 3 of every 4 games we play.  Whether
>I am a patzer or grandmaster is irrelevant, it just means that I should beat you
>3 of every 4 games, every time we play.
>
>When you change the "player pool" then you change everything.  Because
>everyone's rating is supposed to predict their performance against everybody
>else, yet that is patently impossible when you have the case that A beats B, B
>beats C and C beats A, which is not that uncommon.  So the group of players will
>definitely cause rating fluctuation inside the group, depending on the players
>in the group.


Thanks I understand.

Regards

Mike



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