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Individual Calculations September 2011 |
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| Girardo, Christopher Total change: 30.90 | |   |
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| 2011 FIDE Continental America's Amateur Chess Championship | Rosemont, Illinois | USA | 2011-07-01 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2000 | 1782 | 1.50 | 4 | 0.58 | 30 | 17.40 | |
|  Hortillosa, Andres | | | 1974 | USA | 0.00 | 1 | -0.25 | 30 | -7.50 | | | Hua, Margaret M | | | 1970 | USA | 1.00 | 1 | 0.74 | 30 | 22.20 | |  Friedman, David M | | | 1944 | USA | 0.50 | 1 | 0.21 | 30 | 6.30 | | | Tyagi, Kushan | | | 2113 | USA | 0.00 | 1 | -0.12 | 30 | -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) | | | | 6th North American Amateur Open | Skokie, Illinois | USA | 2011-08-19 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1762 | 1782 | 1.50 | 2 | 0.45 | 30 | 13.50 | |
| | Vitkauskas, Vytaut | | | 1693 | USA | 1.00 | 1 | 0.38 | 30 | 11.40 | | | Kosteris, Dimitri | | | 1830 | USA | 0.50 | 1 | 0.07 | 30 | 2.10 | |
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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