Event: Atkinson Cup

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Opponent Rating Result
Graham Chesters 167 ½ - ½
Douglas Vleeshhouwer 166 1 - 0
George A Darling 168 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

434 = (501 + 400 * (2 - 0)) / 3)

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