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BGonline.org Forums
ELO in chess
Posted By: Nack Ballard In Response To: The Donkey Corner #6 - Rollout + Analysis (Robert Chow)
Date: Wednesday, 2 April 2014, at 1:16 a.m.
This strays from the topic of backgammon PR (and I'm not much interested in rating systems in general), but since you brought it up...
My understanding is that a player stronger by 100 ELO is expected to score 64%, and a player strong by 200 ELO to score 76%. (In chess, draws exist, which count half a point, so 76% might mean 76 wins 24 losses 0 draws in 100 games, or 52 wins, 0 losses, 48 draws, or you can use linear interpolation to find other distributions.)
As I recall, the chances of a stronger player beating a weaker player is the same regardless of absolute level. However, the "K factor" (which addresses how many point are at stake) might make it appear otherwise. For the USCF, the K factor is (or was) 32 below 2100, 24 from 2100 to 2400, and only 16 above 2400. For FIDE, the numbers (and parameters) are tighter, maybe just K = 10 at the top, but I think the 200 ELO = .76 is the same for both systems and regardless of level.
For example, Magnus Carlsen, if playing at his (peak) rating of 2881, should score .76 (something like 64% wins, 12% losses and 24% draws) against a lowly 2681 player.
Nack
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