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Individual Calculations April 2009 |
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| Perera, W.c.c. Total change: -12.30 | |   |
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| The Inaugural Royal Challenge International Chess Championship 2009 | Colombo | SRI | 2009-01-10 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2045 | 1929 | 1.50 | 4 | 0.11 | 15 | 1.65 | |
|  Kalugampitiya, R.s. | | | 2115 | SRI | 0.00 | 1 | -0.26 | 15 | -3.90 | |  Kuruwitage, Yasas Kalana | | | 1938 | SRI | 1.00 | 1 | 0.51 | 15 | 7.65 | | | Kottahachchy, K.o.v. | | | 2034 | SRI | 0.50 | 1 | 0.14 | 15 | 2.10 | | | Kurukulasuriya, Prasanna | | | 2092 | SRI | 0.00 | 1 | -0.28 | 15 | -4.20 | |
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) | | | | 2nd Colombo Chess Festival '09 | Colombo | SRI | 2009-02-20 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1959 | 1929 | 0.50 | 3 | -0.88 | 15 | -13.20 | |
| | Narayanan, Srinath | m | | 2279 | IND | 0.00 | 1 | -0.11 | 15 | -1.65 | | | Seneviratne, Shehan | | | 1579 | SRI | 0.50 | 1 | -0.39 | 15 | -5.85 | | | Fonseka, C.k.d. | | | 2020 | SRI | 0.00 | 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) | | | | Sri Lanka Open International Rating Chess Tournament 2009 | Kandy | SRI | 2009-03-06 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2103 | 1929 | 0.50 | 2 | -0.05 | 15 | -0.75 | |
| | Mallawarachchi, T.s. | | | 2091 | SRI | 0.50 | 1 | 0.21 | 15 | 3.15 | | | Kalugampitiya, Rajeendra | | | 2115 | SRI | 0.00 | 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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