Author: Jeff Lischer
Date: 20:01:21 12/02/00
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On December 01, 2000 at 23:23:35, Robert Hyatt wrote: >On December 01, 2000 at 11:09:19, Jeroen van Dorp wrote: > >>On November 30, 2000 at 19:53:55, Terry Ripple wrote: >> >>>If a Player is rated 2500 FIDE, then what would be his aproximate USCF rating? >>> >>>Thanks in advance for your information! >>> >>>Regards,Terry >> >> >>USCF = (ELO * 0.895) + 367. >>ELO = (USCF -367)/0.895 >> >> >> >>so 2500 FIDE = 2383 >> >> >>Jeroen ;-} > > >That's way off. Ken Sloan did a careful comparison a few years ago, and found >that at the 2500+ level, USCF was about 35 points higher IIRC. Not over a >hundred as the above formula predicts. IN fact, the conversion formula would >be a non-linear equation as the difference varies depending on the rating... >More at lower levels, less at the top. Section 28D1 in the 4th Edition of the USCF Official rules of chess gives the following conversions: (1) USCF = FIDE + 50 (2) USCF = 0.895*FIDE + 367 It goes on to say: "Formula (1) represents an average conversion. This means that 50% of the time the FIDE-rated player will be stronger than his or her converted USCF rating would indicate. By using formula (2), on the other hand, a tournament director ensures that the FIDE-rated player will be stronger than his or her converted USCF rating only 10% of the time, thus providing a greater degree of protection for the players with established USCF ratings."
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