Event: Doncaster League

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Opponent Rating Result
Ismet Berisha 139 1 - 0
Martin S Simmonds 136 1 - 0
George D Boothman 121 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

399 = (396 + 400 * (2 - 0)) / 3)

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