Event: Doncaster League

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Opponent Rating Result
John P Mainwaring 140 ½ - ½
Robert Bacon 109 ½ - ½
Hugh A Jones 101 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

117 = (350 + 400 * (0 - 0)) / 3)

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