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Individual Calculations September 2009 |
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| Kahn, Aaron E Total change: 4.95 | |   |
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| 2009 Chesapeake Open | Baltimore, Maryland | USA | 2009-06-19 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2079 | 2192 | 1.00 | 1 | 0.35 | 15 | 5.25 | |
|  Strenzwilk, Denis | | | 2079 | USA | 1.00 | 1 | 0.35 | 15 | 5.25 | |
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) | | | | 37th Annual World Open - Under 2400 Section | Philadelphia, Pennsylvania | USA | 2009-06-29 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2187 | 2192 | 2.00 | 4 | -0.02 | 15 | -0.30 | |
| | Acor, Corey | | | 2248 | USA | 0.50 | 1 | 0.08 | 15 | 1.20 | |  Iwu, Okechukwu A | | | 2198 | USA | 0.00 | 1 | -0.49 | 15 | -7.35 | | | Williams, Christopher | | | 2244 | USA | 1.00 | 1 | 0.57 | 15 | 8.55 | | | Pressman, Leif A | | | 2057 | USA | 0.50 | 1 | -0.18 | 15 | -2.70 | |
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) | | |
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