Event: Doncaster League

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Opponent Rating Result
John Smart 129 1 - 0
Nicholas Mahoney 147 1 - 0
George D Boothman 128 1 - 0
Andrew Butterworth 180 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

446 = (584 + 400 * (3 - 0)) / 4)

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