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Individual Calculations October 2021 |
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| Aherne, John P. Total change: -20.40 | |   |
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| The 100th Irish Championships 2021 | Dublin | IRL | 2021-07-31 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2025 | 1903 | 0.00 | 3 | -1.02 | 20 | -20.40 | |
|  Murray, David | | | 2142 | IRL | 0.00 | 1 | -0.20 | 20 | -4.00 | |  Cafolla, Peter | | | 1958 | IRL | 0.00 | 1 | -0.42 | 20 | -8.40 | | | Murchadha, Oissine | | | 1976 | IRL | 0.00 | 1 | -0.40 | 20 | -8.00 | |
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) | | |
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