Event: Mamhead league

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Opponent Rating Result
Clifford B Peach 106 1 - 0
Macey J Rickard 102 1 - 0
Robert G Wilby 140 0 - 1
Malcolm Belt 119 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

217 = (467 + 400 * (2 - 1)) / 4)

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