Event: Ross Cup

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Opponent Rating Result
Dave M Cooper 121 1 - 0
John Thackray 166 ½ - ½
Bryan Wilson 110 1 - 0
John E Sugden 111 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

427 = (508 + 400 * (3 - 0)) / 4)

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