Event: Mamhead

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Opponent Rating Result
A Jon Munsey 120 0 - 1
J Stephen Murray 147 0 - 1
Charles V Howard 160 0 - 1
James Schofield 139 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-259 = (566 + 400 * (0 - 4)) / 4)

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