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Subject: Re: Incorrect comments regarding ELO performance rating

Author: José de Jesús García Ruvalcaba

Date: 05:27:55 11/10/02

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On November 09, 2002 at 19:35:23, Stephen A. Boak wrote:

>On November 09, 2002 at 13:59:43, Jorge Pichard wrote:
>
>This also hold true for lower rated players, if
>>you get a player with an Elo of 2200 and face him to play against a group with
>>an average Elo of 1800 it won't be unusual for him to get a performance rating
>>of 2400 or higher.
>>
>>Pichard.
>
>Traditional ELO performance rating calculations use the +/- 400 point rule.  If
>you win all your games in the event, your *maximum* performance rating is
>limited (capped) at 400 points higher than the average of your opponents.  Thus
>your scenario above would be impossible.
>
>I realize there are other software calculators that do not use the +/- 400 point
>rule, but then I don't consider them to be ELO based.  [They may be considered
>alternative rating systems, and worthy of experimentation or implementation, but
>they are not really the ELO system.]
>
>--Steve

Actually those 400 points do not come from Prof. Arpad Elo's original system.
They are used only for approximate (but fast) computations.
José.



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