Event: Mamhead

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Opponent Rating Result
Mark C Bowhay 162 0 - 1
Robert G Wilby 139 1 - 0
Clifford B Peach 107 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

269 = (408 + 400 * (2 - 1)) / 3)

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