Event: Croydon

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Opponent Rating Result
George Bradney-Mullin 1260 1 - 0
Maxime Quillaud 1948 0 - 1
Yong Gui Wang 116 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

975 = (3324 + 400 * (1 - 2)) / 3)

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