Event: IM Brown

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Opponent Rating Result
Mike Wilford 114 0 - 1
Paul Howden 147 0 - 1
C Rodney S Mitchinson 78 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-20 = (339 + 400 * (1 - 2)) / 3)

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