Event: Mamhead league

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Opponent Rating Result
Meyrick Shaw 169 0 - 1
Andrew S Kinder 147 0 - 1
Ben R Wilkinson 138 1 - 0
Plamen D Sivrev 161 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

154 = (615 + 400 * (2 - 2)) / 4)

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