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Individual Calculations July 2009 |
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| Perera, W.c.c. Total change: 18.45 | |   |
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| Sri Lanka Junior National Chess Championship 2009 | Colombo | SRI | 2009-04-17 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2007 | 1917 | 1.50 | 2 | 0.74 | 15 | 11.10 | |
|  Madugalle, Y.d.b. | | | 2050 | SRI | 0.50 | 1 | 0.18 | 15 | 2.70 | |  Hapuarachchi, H.l.m. | | | 1963 | SRI | 1.00 | 1 | 0.56 | 15 | 8.40 | |
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) | | | | Kandy Major Chess Championship 2009 | Kandy | SRI | 2009-04-25 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1891 | 1917 | 1.00 | 3 | -0.59 | 15 | -8.85 | |
| | Hapuarachchi, H.l.m | | | 1963 | SRI | 0.50 | 1 | 0.06 | 15 | 0.90 | | | Lamawansa, Yasas | | | 1721 | SRI | 0.50 | 1 | -0.25 | 15 | -3.75 | | | Bandara, P.m.r.l | | | 1989 | SRI | 0.00 | 1 | -0.40 | 15 | -6.00 | |
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) | | | | Sri Lanka B Chess Championship 2009 | Colombo | SRI | 2009-05-09 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2008 | 1917 | 4.50 | 9 | 1.08 | 15 | 16.20 | |
| | Mallawarachchi, T.s. | | | 2075 | SRI | 1.00 | 1 | 0.71 | 15 | 10.65 | | | Senaka, Rajeendra | | | 2126 | SRI | 0.50 | 1 | 0.27 | 15 | 4.05 | | | Wijekoon, Chandana | | | 1965 | SRI | 1.00 | 1 | 0.57 | 15 | 8.55 | | | Edirisinghe, Dulan | | | 2128 | SRI | 0.00 | 1 | -0.23 | 15 | -3.45 | | | Alahakoon, Isuru | | | 1947 | SRI | 0.00 | 1 | -0.46 | 15 | -6.90 | | | Hapuarachchi, H.l.m. | | | 1963 | SRI | 0.50 | 1 | 0.06 | 15 | 0.90 | | | Pinto, Semuthu | | | 1887 | SRI | 0.50 | 1 | -0.04 | 15 | -0.60 | | | Kottahachchy, K.o.v | | | 2050 | SRI | 0.00 | 1 | -0.32 | 15 | -4.80 | | | Chandrarathne, W.s.n. | | | 1933 | SRI | 1.00 | 1 | 0.52 | 15 | 7.80 | |
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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