Event: Summer Rapidplay

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Opponent Rating Result
Toefl Lankapura 1100 0 - 1
Isaac Machin 790 0 - 1
George Butterworth 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

497 = (1890 + 400 * (1 - 2)) / 3)

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