Event: Mamhead league

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Opponent Rating Result
Meyrick Shaw 169 0 - 1
Plamen D Sivrev 161 0 - 1
Charles Doidge 108 1 - 0
Alan W Brusey 158 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

49 = (596 + 400 * (1 - 2)) / 4)

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