Event: Under 110

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Opponent Rating Result
John A Metcalfe 68 ½ - ½
John A Metcalfe 68 1 - 0
Gary Bennett 81 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

72 = (217 + 400 * (1 - 1)) / 3)

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