Event: Doncaster League

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Opponent Rating Result
Robert Bacon 104 1 - 0
T Ed Sowerby 126 1 - 0
John P Mainwaring 138 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

389 = (368 + 400 * (2 - 0)) / 3)

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