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Individual Calculations October 2008 |
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| Alfaro Rojas, Alfonso Total change: -18.45 | |   |
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| Campeonato Nacional de Costa Rica 2008 Fase 1 | Moravia | CRC | 2008-05-17 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2075 | 2116 | 3.50 | 6 | 0.21 | 15 | 3.15 | |
|  Leandro, Jhonny | | | 2124 | CRC | 0.50 | 1 | 0.01 | 15 | 0.15 | |  Machado Ramirez, Allan | | | 2068 | CRC | 0.50 | 1 | -0.07 | 15 | -1.05 | | | Bermudez, Sergio | f | | 2180 | CRC | 0.50 | 1 | 0.09 | 15 | 1.35 | | | Cabrera, Marco Antonio | | | 2047 | CRC | 1.00 | 1 | 0.40 | 15 | 6.00 | | | Vargas Serano, Pablo | | | 1829 | CRC | 0.50 | 1 | -0.34 | 15 | -5.10 | | | Granados, Carlos | | | 2201 | CRC | 0.50 | 1 | 0.12 | 15 | 1.80 | |
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) | | | | Campeonato Subzonal Masculino 2008 | Guatemala, Guatemala | GUA | 2008-06-07 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2009 | 2116 | 0.50 | 2 | -0.79 | 15 | -11.85 | |
| | Godoy C., Miguel Angel | | | 2066 | GUA | 0.00 | 1 | -0.57 | 15 | -8.55 | | | Argueta, Carlos | | | 1951 | ESA | 0.50 | 1 | -0.22 | 15 | -3.30 | |
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) | | | | IV Torneo Internacional de Ajedrez Alajuela 2008 | Alajuela | CRC | 2008-07-09 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2316 | 2181 | 2.50 | 5 | 0.81 | 15 | 12.15 | |
| | Ramirez, Alejandro | g | | 2531 | CRC | 0.00 | 1 | -0.11 | 15 | -1.65 | | | Sanchez, Ingrid | | | 1963 | ESA | 1.00 | 1 | 0.22 | 15 | 3.30 | | | Valdes, Leonardo | m | | 2408 | CRC | 0.50 | 1 | 0.29 | 15 | 4.35 | | | Arias, Mauricio | m | | 2310 | CRC | 0.50 | 1 | 0.17 | 15 | 2.55 | | | Alonso Garcia, Rene | m | | 2369 | CUB | 0.50 | 1 | 0.24 | 15 | 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) | | | | Campeonato Nacional de Costa Rica 2008 Fase 2 | San José | CRC | 2008-08-23 |
| Rc | Ro | w | n | change | K | K*chg | Game |
| 2180 | 2181 | 3.00 | 9 | -1.46 | 15 | -21.90 | |
| | Hernandez Basante, Francisco | m | | 2254 | CRC | 0.00 | 1 | -0.40 | 15 | -6.00 | | | Vargas Serano, Pablo | | | 1831 | CRC | 1.00 | 1 | 0.11 | 15 | 1.65 | | | Machado Ramirez, Allan | | | 2068 | CRC | 1.00 | 1 | 0.35 | 15 | 5.25 | | | Gonzalez, Bernal | m | | 2423 | CRC | 0.00 | 1 | -0.20 | 15 | -3.00 | | | Vives, David | | | 2061 | CRC | 0.50 | 1 | -0.16 | 15 | -2.40 | | | Cabrera, Marco Antonio | | | 2065 | CRC | 0.00 | 1 | -0.66 | 15 | -9.90 | | | Murillo, Alexis | m | | 2319 | CRC | 0.50 | 1 | 0.19 | 15 | 2.85 | | | Valdes, Leonardo | m | | 2408 | CRC | 0.00 | 1 | -0.21 | 15 | -3.15 | | | Ruiz Blais, Sebastian | | | 2195 | CRC | 0.00 | 1 | -0.48 | 15 | -7.20 | |
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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