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Individual Calculations September 2011 |
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| Helfst, Matt D Total change: -30.30 | |   |
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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 |
| 1954 | 1971 | 1.00 | 3 | -0.57 | 15 | -8.55 | |
|  Virkud, Apurva | | | 1782 | USA | 0.00 | 1 | -0.75 | 15 | -11.25 | |  Liang, Adream | | | 1952 | USA | 1.00 | 1 | 0.47 | 15 | 7.05 | | | Szpisjak, Steven J | | | 2127 | USA | 0.00 | 1 | -0.29 | 15 | -4.35 | |
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) | | | | 112th Annual US Open | Orlando, Florida | USA | 2011-07-30 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2371 | 1971 | 0.00 | 1 | -0.08 | 15 | -1.20 | |
| | Naroditsky, Daniel | m | | 2371 * | USA | 0.00 | 1 | -0.08 | 15 | -1.20 | | | * Rating difference of more than 400. Please read more at FIDE Handbook |
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) | | | | 2011 Manhattan Open - Open Section | New York, New York | USA | 2011-08-17 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2043 | 1971 | 2.00 | 8 | -1.37 | 15 | -20.55 | |
| | Korley, Kassa | f | | 2326 | USA | 0.00 | 1 | -0.11 | 15 | -1.65 | | | Gisclan, Heverton | | | 2247 | BRA | 0.00 | 1 | -0.17 | 15 | -2.55 | | | Shvartsman, Andrew | c | | 2209 | USA | 0.00 | 1 | -0.20 | 15 | -3.00 | | | Dadello, Alexandra | | | 1811 | POL | 0.00 | 1 | -0.71 | 15 | -10.65 | | | Atanasiu, Nicolae | | | 2007 | BEL | 0.00 | 1 | -0.45 | 15 | -6.75 | | | Dadello, Andrzej | | | 1799 | POL | 0.50 | 1 | -0.23 | 15 | -3.45 | | | Black Jr, James A | | | 2105 | USA | 0.50 | 1 | 0.18 | 15 | 2.70 | | | Bauza Mercere, Eduardo | | | 1839 | ARG | 1.00 | 1 | 0.32 | 15 | 4.80 | |
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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