Event: Mamhead league

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Opponent Rating Result
Walter Braun 203 1 - 0
Sam Coutu-Oughton 0 1 - 0
Matthew R Wilson 161 0 - 1
Charles V Howard 155 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

330 = (519 + 400 * (3 - 1)) / 4)

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