Author: Odd Gunnar Malin
Date: 08:53:26 03/18/05
Go up one level in this thread
On March 18, 2005 at 09:08:33, Mathieu Pagé wrote: >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. Hi, thanks for the link. Much interesting there. But, it suggest my alghorithm above (log10) as correct. This doesn't match with this table on the FIDE site: http://www.fide.com/official/handbook.asp?level=B0210 What a player do to find his performance is to just calculate his score/games and go into the table to lookup the number. Some differences: Score Fide log10 -------------------- 0.9 366 362 0.8 240 238 0.7 140 148 0.6 72 72 Programmicaly its just as easy to use a lookuptable as calculate. 1000 integers (3 decimal on score) is only 4Kb memory usage (half with words). Odd Gunnar
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