Event: Division A

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Opponent Rating Result
Peter A Garrett 156 ½ - ½
Phillip J Taylor 160 0 - 1
John D Lyth 180 ½ - ½
Graham J Ashcroft 161 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

64 = (657 + 400 * (0 - 1)) / 4)

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