Event: Altrincham

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Opponent Rating Result
Wiktor Lech 0 1 - 0
George Seaman 0 1 - 0
Hugo Wilkinson 1310 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

570 = (1310 + 400 * (2 - 1)) / 3)

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