Author: Dan Wulff
Date: 09:39:57 06/03/04
Go up one level in this thread
Hi Mike! On June 02, 2004 at 20:34:36, Mike Byrne wrote: >>there are other ways to do this, but this is very simple to set up in a >>speadsheet as you mulitly the bonus by the result (1,0,1/2) add the base (opp >>rating -400) to get the individual game performace rating and then just average >>the performace ratings This method would explain why one game can give a huge performance rating difference. I'm not sure that this is a feasible method, though. What I tried was the following: A 2500 player (white) against a 2600 player (black): The expected score is calculated as: 1/(1+10^((2600-2500)/400) = 0.3599 for the stronger player. if the weaker player wins, he gets 16*(1-0.3599) = 10 ELO (Rounded down from 10.25, so his performance rating is 2500+10 = 2510 in the game and the stronger player's performance is 2600-10 = 2590, which is clearly not what intended. This is the way it is done in the ELO system, if I am not totally mistaken. A draw would yield a difference of 2.24 rating points using this formula, but that result is clearly misleading. I'm confused. Greetings Dan Wulff (The Gandalf Team)
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