Event: Mamhead league

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Opponent Rating Result
H William Ingham 163 1 - 0
Plamen D Sivrev 161 0 - 1
James Schofield 156 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

293 = (480 + 400 * (2 - 1)) / 3)

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