Author: Mathieu Pagé
Date: 06:08:33 03/18/05
Go up one level in this thread
On March 18, 2005 at 07:01:57, Odd Gunnar Malin wrote: >On March 18, 2005 at 05:04:18, Tony Hedlund wrote: > >>On March 18, 2005 at 00:35:00, emerson tan wrote: >> >>>On March 18, 2005 at 00:27:04, emerson tan wrote: >>> >>>>I want to know the rating of Frizt 5.32 on Athlon 1200Mhz, so I run a series of >>>>matches with programs that have established ratings. >>>> >>>>Supposed Fritz 5.32 scored from the following matches: >>>> >>>>Junior 8.0 elo 2782 14.5 - 5.5 Fritz 5.32 >>>>Shredder 7.0 elo 2772 12.0 - 8.0 Fritz 5.32 >>>>Deep Frizt 8.0 elo 2790 16.0 - 4.0 Fritz 5.32 >>>>Chess Tiger 14.0 elo 2719 11.5 - 8.5 Frizt 5.32 >>>>Hiarcs 9.0 elo 2747 13.5 - 6.5 Frizt 5.32 >>>> >>>>How do I compute the elo of Fritz 5.32 ? >>>> >>>>Thanks >>> >>> >>>I can only see some plus or minus from its matches but no elo rating. >> >>average elo+ 400*(won-lost)/games >> >>2762+ 400*(32.5-67.5)/100 >> >>2762-140 = 2622 >> >>Tony > >Hi. > >Your formula are correct for unrated players but do you have the correct formula >to calculate performans for rated players. > >First I used this approx: > >score=points/games >average=average of opponents rating. > >perf=(average-400*log10((1.0-score)/score) > >This gives maybe correct performance rating around 50% score but as soon as you >go a bit away the error get bigger. > >Then I tried from Excel with this: >perf=average+NORMSINV(score)*ROT(2)*200 >This gives a much better result and the error is only when the score get close >to 100% (or 0%) > >It kind of hard for me to remember all these math, it have been 26 years since I >left the school so I'm luck if I even remember correct the names like standard >deviation, standard distribution etc. so if you or other have a table with this >calculated out with 3 decimals (0.001, 0.002 ...) for the score it would have >been nice. >I will create this table myself with the help of the table for 2 decimals (from >Fide or elsewhere) and use the excel formula to find the in between numbers. > >What the usage? >I have written a program to post results/tables to the internet (add result plus >one click and it on the net) that we have been using in tournaments for live >coverage the last 3-4 years. >I use the formula with log10 now, but someone may check the program with >tournamentresults found at Twic etc. and see that the performance isn't >calculated correct. So instead of calculate the result I will change it to look >up the numbers from a table > >Odd Gunnar Hello Odd, http://en.wikipedia.org/wiki/ELO_rating_system MP.
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