Event: Mamhead league

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Opponent Rating Result
Robert H Jones 128 1 - 0
A Jon Munsey 135 1 - 0
Joshua P Blackmore 143 1 - 0
Mark J Cockerton 125 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

533 = (531 + 400 * (4 - 0)) / 4)

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