Author: Odd Gunnar Malin
Date: 08:58:49 03/18/05
Go up one level in this thread
On March 18, 2005 at 11:53:26, Odd Gunnar Malin wrote: >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: Sorry I used the normsinv function instead, here is the list: Score Fide log10 -------------------- 0.9 366 382 0.8 240 241 0.7 149 147 0.6 72 70 > >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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