Event: Rated club games

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Opponent Rating Result
Max Hardwick 1106 ½ - ½
Max Hardwick 1164 1 - 0
Hamish Simpson 1175 0 - 1
Edward Chaloner 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

961 = (3445 + 400 * (2 - 1)) / 4)

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