Event: Open

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Opponent Rating Result
Robert Marks 144 1 - 0
Geoffrey C Wesson 122 1 - 0
Robert Marks 144 1 - 0
Geoffrey C Wesson 122 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

333 = (532 + 400 * (3 - 1)) / 4)

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