Event: Doncaster Bell Trophy

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Opponent Rating Result
John Smart 107 ½ - ½
Alan J Smith 113 ½ - ½
John Smart 107 1 - 0
Alan J Smith 113 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

310 = (440 + 400 * (2 - 0)) / 4)

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