Author: Uri Blass
Date: 05:31:51 06/13/01
Go up one level in this thread
On June 13, 2001 at 06:24:17, Christophe Theron wrote: >On June 13, 2001 at 06:15:02, Uri Blass wrote: > >>On June 13, 2001 at 05:57:11, Christophe Theron wrote: >> >>>On June 13, 2001 at 05:35:30, stuart taylor wrote: >>> >>>>On June 13, 2001 at 05:05:45, Marcus Kaestner wrote: >>>> >>>>> >>>>>> >>>>>>It is the most reliable tool that we have to evaluate the chess programs. The >>>>>>difference in the opponents each program has to face does not matter from a >>>>>>mathematical point of view. >>>>> >>>>>i think you are wrong! >>>>> >>>>>having now over two years of experience with my own chessbits-lists, i can say >>>>>to you that it is VERY easy to place a program with a HIGHLY overrated (or >>>>>underrated) position into the list. >>>>> >>>>>there are dozens of possibilities to fake a rating. >>>>> >>>>>i do not say that the ssdf fakes, i only say that it DOES matter which opponents >>>>>you choose. >>>>> >>>>>marcus >>>> >>>>Of course it does! >>>>If you play a 1200 elo rated player you can be sure to win 100% of times, and >>>>you play 100,000 games, you will have got a rating of 3000 long long before >>>>then. >>> >>> >>> >>>No you are definitely wrong. >>> >>>Due to the elo calculation formulas, a program which wins 100% of its games >>>against a 1200 elo opponent will have a rating of exactly 1600. >>> >>>Far from 3000, isn't it? >>> >>>Food for thoughts. >> >>It is truth by the linear formula but not by the right formula. >>The linear formula is only approximation to the right formula >> >>Here is a better formuala: >> >>If you score an average of P points in every game then your rating is >>400logP/(1-P) more than your opponent when you use log by basis 10. >> >>It means that difference of 400 means that you beat your opponent 10-1 >>800 elo difference means that you beat your opponent 100-1 >>1200 elo difference means that you beat your opponent 1000-1 >> >>You do not get never 100% by this formula unless your rating is infinite. >> >>Uri > > > >Do you mean 400log(P/(1-P))? Yes > >By this formula, if you win against a 1200 elo opponent by a score of 1000-1, >then your rating is 2400, right? > > > > Christophe Yes Uri
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