Event: Doncaster League

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Opponent Rating Result
Farrell P Clifford 123 1 - 0
Peter Convery 153 1 - 0
Andrew Butterworth 170 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

415 = (446 + 400 * (2 - 0)) / 3)

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