Author: Christophe Theron
Date: 02:49:39 07/10/01
Go up one level in this thread
On July 10, 2001 at 05:02:35, Vincent Lejeune wrote:
>
>>BTW the first round of the match is completed now. ChessTiger 14 reached very
>>good 61.5 %. Could someone
>>please calculate, how much ELO difference 61.5 % mean compared to the average
>>ELO of the opponents?
>>Thanks a lot!
>
>That means a +92 Elo difference
Sorry Vincent, but this is not right.
A 61.5% winning percentage means approximately a 80.5 Elo points difference.
The rule of thumb is very simple: take the winning percentage, substract 50,
then multiply by 7.
This rule is an approximation (but a very good one) that works only in the range
20% to 80%.
Christophe
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