Event: Morecambe Open

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Opponent Rating Result
John Marshall 1510 1 - 0
Sean Parker 1640 1 - 0
John Marshall 1510 1 - 0
Sean Parker 1640 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1875 = (6300 + 400 * (3 - 0)) / 4)

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