Event: Open

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Opponent Rating Result
Christopher D Lewis 154 1 - 0
Julian H Summerfield 143 1 - 0
Christopher D Lewis 154 ½ - ½
Julian H Summerfield 143 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

449 = (594 + 400 * (3 - 0)) / 4)

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