Event: Summer Open Division

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Opponent Rating Result
Geoffrey C Rosser 112 1 - 0
John A Edge 178 ½ - ½
Geoffrey C Rosser 112 1 - 0
John A Edge 178 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

445 = (580 + 400 * (3 - 0)) / 4)

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