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Individual Calculations May 2011 |
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| Van Kemenade, Rudy Total change: -9.90 | |   |
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| Welsh Chess Premier League | Various | WLS | 2010-11-13 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1912 | 1951 | 1.50 | 3 | -0.16 | 15 | -2.40 | |
|  Ehsandar, Peter | | | 1848 | WLS | 0.50 | 1 | -0.14 | 15 | -2.10 | |  Young, Alan | | | 2024 | WLS | 0.00 | 1 | -0.40 | 15 | -6.00 | | | Thomas, James | | | 1865 | WLS | 1.00 | 1 | 0.38 | 15 | 5.70 | |
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) | | | | The 57th Welsh Chess Championships | Cardiff | WLS | 2011-04-22 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2019 | 1951 | 2.50 | 7 | -0.50 | 15 | -7.50 | |
| | Sands, David A | | | 2238 | ENG | 0.50 | 1 | 0.34 | 15 | 5.10 | | | Rees, Ioan | f | | 2319 | WLS | 0.00 | 1 | -0.10 | 15 | -1.50 | | | Smith, Olivia | | wf | 2004 | WLS | 0.50 | 1 | 0.07 | 15 | 1.05 | | | Heap, Gerry | | | 1954 | WLS | 0.50 | 1 | 0.00 | 15 | 0.00 | | | Ralphs, Nigel | | | 1932 | WLS | 0.00 | 1 | -0.53 | 15 | -7.95 | | | Kelly, Paul J | | | 1924 | WLS | 0.00 | 1 | -0.54 | 15 | -8.10 | | | Bullen, Alex | | | 1764 | WLS | 1.00 | 1 | 0.26 | 15 | 3.90 | |
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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