Event: Mamhead league

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Opponent Rating Result
H William Ingham 163 ½ - ½
Vignesh Ramesh 164 ½ - ½
David J Archer 154 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

160 = (481 + 400 * (0 - 0)) / 3)

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