Event: Mamhead league

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Opponent Rating Result
David Twine 181 1 - 0
Sam Coutu-Oughton 0 ½ - ½
David J Archer 154 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

378 = (335 + 400 * (2 - 0)) / 3)

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