Event: Moyle league

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Opponent Rating Result
Raymond W Chubb 83 1 - 0
Graham L Jones 91 1 - 0
Raymond W Chubb 83 1 - 0
Graham L Jones 91 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

487 = (348 + 400 * (4 - 0)) / 4)

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