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Individual Calculations September 2021 |
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| Gu, Crystal Jiuzhou Total change: 51.60 | |   |
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| 26th Annual Pacific Coast Open - Under 2100 | Van Nuys, California | USA | 2021-07-30 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1650 | 1387 | 2.00 | 4 | 1.19 | 40 | 47.60 | |
|  Trifan, Octavian Alexandru | | | 1417 | ROU | 1.00 | 1 | 0.54 | 40 | 21.60 | |  Schmitt, Ryan L | | | 1780 | USA | 0.50 | 1 | 0.42 | 40 | 16.80 | | | Jiang, Lucas | | | 1711 | USA | 0.00 | 1 | -0.13 | 40 | -5.20 | | | Adkins, Rico | | | 1690 | USA | 0.50 | 1 | 0.36 | 40 | 14.40 | |
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) | | | | 2021 North American Youth Chess Championships - Girls Under 12 | Chicago, Illinois | USA | 2021-08-17 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 1407 | 1380 | 3.00 | 6 | 0.10 | 40 | 4.00 | |
| | Fausto, Aliana | | | 1226 | USA | 0.50 | 1 | -0.21 | 40 | -8.40 | | | Kanury, Riya A | | | 1322 | USA | 1.00 | 1 | 0.42 | 40 | 16.80 | | | Vidyarthi, Omya | | wc | 1780 * | USA | 0.00 | 1 | -0.08 | 40 | -3.20 | | | Cheng, Claire | | | 1203 | USA | 0.50 | 1 | -0.23 | 40 | -9.20 | | | Arivoli, Sadhana | | | 1388 | USA | 1.00 | 1 | 0.51 | 40 | 20.40 | | | Bian, Erin | | | 1525 | USA | 0.00 | 1 | -0.31 | 40 | -12.40 | | | * 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) | | |
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