Author: ed
Date: 15:07:20 10/21/98
Go up one level in this thread
On October 21, 1998 at 12:20:27, Bruce Moreland wrote: > >On October 21, 1998 at 09:02:26, ed wrote: > >>Should have read "closer" to even. Btw, a 60% score is only worth ~ 60 points. >>Need 66% score for 100 points. But in any case, i agree with what bob said, a >>small delta in CPU speed between comp-comp games can mean a *huge* diff in final >>result, if not huge, certainly much more so than what one would expect. > >OK, I was wrong about 60% being 100 points. I'm using the formula: > > point delta = 500 * log(1/percentage - 1) > >K actually has nothing to do with this, by the way. > >If FIDE is doing something differently, then I'm totally wrong. > >But using this formula: > >60% is 70 points >100 points is 65% > >bruce FIDE uses TPR=(((win-loss)*400)/#games) + avg_rating and the actual final rating change is about 1/5 or 1/3 of of the delta between the TPR and the original rating (depending on the K).
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