Event: Doncaster League

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Opponent Rating Result
Peter Convery 153 ½ - ½
Ismet Berisha 143 1 - 0
Nicholas Mahoney 147 1 - 0
Phillip J Battye 131 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

344 = (574 + 400 * (2 - 0)) / 4)

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