Author: Uri Blass
Date: 11:11:35 03/17/04
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On March 17, 2004 at 13:52:55, Christophe Theron wrote: >On March 17, 2004 at 12:35:41, Uri Blass wrote: > >>On March 17, 2004 at 11:43:12, Anson T J wrote: >> >>>On March 17, 2004 at 10:40:30, Bigler David wrote: >>> >>>>Hi, >>>> >>>>Shredder 8 performed 82 ELO point better than Junior 8 >>>>Junior 8 performed 82 ELO point better than Shredder 7.04 >>>> >>>>So Shredder 8 performed 164 ELO better than Shredder 7.04 >>>> >>>>rgds >>> >>>I see, I thought when it was -41 / +41 that A was 41 weaker than b and b was 41 >>>stronger than a. Not that a was 82 weaker and b was 82 stronger. Perhaps you are >>>correct. thx >> >>56% is less than 50 elo difference based on fast calculation. >> >>If the result is 56-44 then I get the following difference in rating >> >>(56-44)/100*400=48 so my calculation give 48 elo. >> >> >>The formula that I use is only approximation to the real formula so I guess that >>41 is correct and not 82. >> >>Uri > > > >There is a simpler formula that is easy to remember. > >1) take the winning percentage of the winner >2) if it is above 80% stop here (the formula below does not apply) >3) subtract 50 from the winning percentage >4) multiply by 7 >5) the result is the elo difference between the two The formula that I use is equivalent to doing the same as you do but multiplying it by 8 instead of 7. Maybe your formula give better approximation but the formula that is equivalent to multiplying by 8 is used by the israeli chess federation when they calculate performance of new players in order to give them initial rating(it is only for part of the players and part of the players get initial rating 1350). Usually the players who get initial rating based on performance are players with experience from tournaments in other countries and it is not their first tournament. Uri
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