Event: Rapidplay Cup

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Opponent Rating Result
Jakub Sosinski 1838 0 - 1
Jakub Sosinski 1838 0 - 1
John G Cooper 1931 ½ - ½
John G Cooper 1931 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1585 = (7538 + 400 * (0 - 3)) / 4)

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