Event: Moyle league

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Opponent Rating Result
Alan F Webster 84 1 - 0
Jacquie Barber-Lafon 132 ½ - ½
John E Allen 134 1 - 0
Alan F Webster 84 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

409 = (434 + 400 * (3 - 0)) / 4)

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