Author: Richard A. Fowell (fowell@netcom.com)
Date: 17:45:36 11/29/98
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On November 29, 1998 at 20:21:50, odell hall wrote: >Hi CCC > > I recently completed a six game match between Chessmaster 4000 running on a >pent 233 16meb and a USCF 2280 rated master. The games were played at a time >control of Game in 60. Chessmaster won the match Convincingly with a score of 4 >1/2 to 1 1/2. What type of rating would this give chessmaster based on this >match alone? For a 4 1/2 - 1 1/2 match against a 2280 player: 2480 with a +/- 245 uncertainty at the 95% confidence level. Calculation as follows: Tournament performance rating: (based on formula approximation to rating curve) take the number of points difference in score: 4.5 - 1.5 = 3.0 Multiply by 16 points 3.0 * 16 = 48 points Then by 25 points 48 * 25 = 1200 points divide by the number of games 1200 / 6 = 200 points Add to the opponent's rating 2280 + 200 = 2480. ------------------ 95% confidence level (this is pretty simplistic - I'm just scaling from observations of SSDF posted confidence levels) Take number of games, divide into 100, take square root, multiply by 60: sqrt(100/6)*60 = 245 points. Richard A. Fowell
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