Individual Calculations July 2009
 Urbina Quiros, Edwin  Total change: -19.20  Rating chartPersonal card
 Copa Parque del Norte San Josť CRC 2009-04-21
 2081 2135 1.00 4 -1.28 15 -19.20 
  Alvarado Rodriguez, Dizan 2055 CRC0.501-0.1115-1.65 
  Valdes Romero, Leonardo m2403 CRC0.5010.33154.95 
  Machado Ramirez, Allan 2019 CRC0.001-0.6615-9.90 
  Murillo Arguedas, Jaime 1848 CRC0.001-0.8415-12.60 

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)


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