Event: Mamhead league

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Opponent Rating Result
Steve Clarke 143 1 - 0
H William Ingham 163 1 - 0
Meyrick Shaw 169 1 - 0
Paul Brooks 170 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

561 = (645 + 400 * (4 - 0)) / 4)

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