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Individual Calculations April 2009 |
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| Bonin, Jay Total change: 7.50 | |   |
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| Happy New Year Open | New York, New York | USA | 2009-01-03 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2201 | 2361 | 2.00 | 3 | -0.04 | 10 | -0.40 | |
|  Ostrovskiy, Aleksandr | c | | 2071 | USA | 1.00 | 1 | 0.16 | 10 | 1.60 | |  Sturt, Raven M | | | 2073 | USA | 1.00 | 1 | 0.16 | 10 | 1.60 | | | Rohde, Michael A | g | | 2460 | USA | 0.00 | 1 | -0.36 | 10 | -3.60 | |
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) | | | | 41st Annual Liberty Bell Open | Philadelphia, Pennsylvania | USA | 2009-01-16 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2283 | 2361 | 3.50 | 5 | 0.48 | 10 | 4.80 | |
| | Times, Jerald W | | | 2196 | USA | 0.50 | 1 | -0.22 | 10 | -2.20 | | | Zenyuk, Iryna | c | wm | 2237 | USA | 1.00 | 1 | 0.33 | 10 | 3.30 | | | Melekhina, Alisa | | wm | 2280 | USA | 0.50 | 1 | -0.11 | 10 | -1.10 | | | Samimi, Sohrab | | | 2139 | USA | 1.00 | 1 | 0.22 | 10 | 2.20 | | | Kudrin, Sergey | g | | 2561 | USA | 0.50 | 1 | 0.26 | 10 | 2.60 | |
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) | | | | 39th Annual World Amateur Team & US Team East | Parsippany, New Jersey | USA | 2009-02-14 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2247 | 2361 | 3.50 | 5 | 0.31 | 10 | 3.10 | |
| | Yang, Ruixin | f | | 2109 | USA | 1.00 | 1 | 0.19 | 10 | 1.90 | | | Zlotnikov, Mikhail | m | | 2327 | USA | 1.00 | 1 | 0.45 | 10 | 4.50 | | | Coleman, Teddy | f | | 2284 | USA | 0.50 | 1 | -0.11 | 10 | -1.10 | | | Lowinger, Daniel L | | | 2061 | USA | 0.50 | 1 | -0.35 | 10 | -3.50 | | | Sarkar, Justin | m | | 2455 | USA | 0.50 | 1 | 0.13 | 10 | 1.30 | |
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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