Event: Doncaster League

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Opponent Rating Result
Nicholas Mahoney 147 0 - 1
Peter Convery 153 ½ - ½
Alexandru Zimleanschi 136 1 - 0
Alexandru Zimleanschi 136 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

243 = (572 + 400 * (2 - 1)) / 4)

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