Author: James T. Walker
Date: 15:30:34 10/22/04
Go up one level in this thread
On October 22, 2004 at 13:32:57, Uri Blass wrote: >go to the following link > >http://georgejohn.bcentralhost.com/TCA/perfrate.html > >enter 1400 for 12 opponents >enter 0 for your total score > >Your performance is 1000 but if you enter 1 to your total score your performance >is only 983. > >It seems that the program in that link assume that when the result is 100% or 0% >your performance is 400 elo less that your weakest opponent but when your score >is not 100% it has not that limit so they get illogical results. > >Uri My take on this is they are using a bad formula or have screwed up the program to calculate the Rp. The USCF uses Rp=Rc + 400(W-L)/N Using this formula in your case above would yield Rp=1400 +400(1-11)/12 So: Rp=1400 +400(-10)/12 = 1400 + (-4000/12) So: Rp =1400 + (-333) = 1067 Jim
This page took 0.01 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.