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Individual Calculations September 2009 |
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| Boas, Toby Total change: -34.00 | |   |
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| 2009 US Class Championships | Boca Raton, Florida | USA | 2009-07-17 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2146 | 2183 | 1.50 | 4 | -0.70 | 25 | -17.50 | |
|  Santalla, Andres | | | 2063 | USA | 0.50 | 1 | -0.16 | 25 | -4.00 | |  Veksler, Boris | | | 2088 | USA | 1.00 | 1 | 0.37 | 25 | 9.25 | | | Haskel, Jeffrey | | | 2186 | USA | 0.00 | 1 | -0.50 | 25 | -12.50 | | | Rodriguez, Eric | | | 2245 | USA | 0.00 | 1 | -0.41 | 25 | -10.25 | |
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) | | | | 17th Annual Southern Open | Kissimmee, Florida | USA | 2009-07-31 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2241 | 2183 | 1.50 | 3 | 0.14 | 25 | 3.50 | |
| | Van, Der Lende Illias | | | 2021 | NED | 0.00 | 1 | -0.71 | 25 | -17.75 | | | Storch, Lawrence | | | 2146 | USA | 1.00 | 1 | 0.45 | 25 | 11.25 | | | Becerra, Julio J | g | | 2557 | USA | 0.50 | 1 | 0.40 | 25 | 10.00 | |
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) | | | | 110th Annual US Open | Indianapolis, Indiana | USA | 2009-08-01 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2299 | 2183 | 0.00 | 2 | -0.80 | 25 | -20.00 | |
| | Shabalov, Alexander | g | | 2580 | USA | 0.00 | 1 | -0.08 | 25 | -2.00 | | | Harmon-Vellotti, Luke | | | 2017 | USA | 0.00 | 1 | -0.72 | 25 | -18.00 | |
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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