Event: Doncaster League

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Opponent Rating Result
Robert Bacon 109 1 - 0
A David Smart 122 ½ - ½
Anthony Perry 112 1 - 0
Farrell P Clifford 123 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

417 = (466 + 400 * (3 - 0)) / 4)

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