Event: Rapid League

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Opponent Rating Result
Ivan Kuzmin 0 1 - 0
Ivan Kuzmin 0 ½ - ½
Nyill Ikram 1015
Nyill Ikram 1015 0 - 1
Jack Spicer 1413 0 - 1
Jack Spicer 1413
performance = (sum(opponents ratings) + 400(wins-losses)) / games

507 = (2428 + 400 * (1 - 2)) / 4)

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