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Individual Calculations July 2012 |
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| Perrett, David C Total change: 7.65 | |   |
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| 4NCL | Various | ENG | 2011-11-12 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2007 | 1960 | 2.50 | 6 | -0.14 | 15 | -2.10 | |
|  Adebajo, Olufemi | | | 1940 | ENG | 0.00 | 1 | -0.53 | 15 | -7.95 | |  White, Martin J | | | 1812 | ENG | 1.00 | 1 | 0.30 | 15 | 4.50 | | | Meyer, Gordon | | | 2155 | RSA | 0.00 | 1 | -0.25 | 15 | -3.75 | | | Nwachukwu, Chino | | | 1971 | NGR | 0.50 | 1 | 0.02 | 15 | 0.30 | | | Jones, Christopher M | | | 2051 | ENG | 0.50 | 1 | 0.12 | 15 | 1.80 | | | Healey, Michael W | | | 2110 | ENG | 0.50 | 1 | 0.20 | 15 | 3.00 | |
Rc - average rating of rated opponents, Ro - rating of a player in a tournament, Rp - rating performance of an unrated player, W - points won in a tournament against rated opponents, N - total number of games against rated opponents, Change - change used for calculation according to formula, K - development coefficient, Kchg - rating change of a player calculated as (K * change) | | | | Welsh Chess Premier League Round 4-7 | Various | WLS | 2012-01-28 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1993 | 1956 | 2.00 | 3 | 0.65 | 15 | 9.75 | |
| | Garcia, Jason | | | 2017 | WLS | 0.50 | 1 | 0.08 | 15 | 1.20 | | | Harley-Yeo, Gareth | | | 1978 | WLS | 1.00 | 1 | 0.53 | 15 | 7.95 | | | Van Kemenade, Rudy | | | 1984 | WLS | 0.50 | 1 | 0.04 | 15 | 0.60 | |
Rc - average rating of rated opponents, Ro - rating of a player in a tournament, Rp - rating performance of an unrated player, W - points won in a tournament against rated opponents, N - total number of games against rated opponents, Change - change used for calculation according to formula, K - development coefficient, Kchg - rating change of a player calculated as (K * change) | | |
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