Event: Mamhead league

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Opponent Rating Result
Charles V Howard 155 0 - 1
Oliver E Wensley 172 ½ - ½
Steven J Levy 179 0 - 1
David Twine 181 0 - 1
Steve Clarke 143 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

6 = (830 + 400 * (1 - 3)) / 5)

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