Author: Tony Hedlund
Date: 02:26:22 04/17/05
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On April 16, 2005 at 09:32:14, Eelco de Groot wrote: > Hi Anson > >For a first order approximation, I always use 2812 - (50%-45%)*7 =2777, which is >increasingly inaccurate with greater score-difference. Precise formula involves >calculating an integral, which you can do numerically. > >I once wrote a little program for this for a Casio calculator, but that will not >help you much I'm afraid without an explanation. It took the first order >approximation and went from there. But it is not hard to do if you have the >formula from professor Elo, Excel can do it too, easily. I don't have the >formula at hand right now. But it is a nice programming excercise! > > Eelco To my knowledge USCF uses Rp = Rc + 400(W-L)/N which I have in a Excel spreedsheet. But it's not that hard to use pen and paper either. Tony > > >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.
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