Event: Doncaster Bell Trophy

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Opponent Rating Result
Alan J Smith 113 ½ - ½
Peter Catt 1753 0 - 1
Alan J Smith 113 0 - 1
Peter Catt 1753 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

833 = (3732 + 400 * (1 - 2)) / 4)

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