Author: Kolss
Date: 04:48:56 04/16/05
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On April 15, 2005 at 17:58:30, Anson T J wrote: >Does anyone know the accurate formula to work out ELO performance based on an >estimated elo for a player and the % success? > >For example if Hydra played against Kasparov (2812) and scored 45%, what how >would we work out Hydra's elo performance in this match? > >I remember somebody posted a very accurate formula using logs, if they could >point me to the post or write the formula again in here I would greatly >appreciate it. > >Many thanks. Hi, Def.: diff = ELO Difference; p = fraction of points scored (0 < p < 1). lg = log base 10 Formulas: diff = 400 * lg(p / (1 - p)) p = 10 ^ (diff / 400) / (1 + 10 ^ (diff / 400)) Example: With a score of 45 %, we have p = 0.45, this gives us diff = -35, therefore with an opponent ELO of 2812 a performance of 2812 - 35 = 2777. In the other direction, if your ELO is 2777 and your opponent's is 2812, diff = -35, which gives us p = 0.45, which is your expected score in a match. Hope this helps! Best regards - Munjong.
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