Event: Parkinson

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Opponent Rating Result
Simon Johnson 141 0 - 1
Mike J Barnett 135 0 - 1
John K Holliday 141 1 - 0
John Brooke 96
performance = (sum(opponents ratings) + 400(wins-losses)) / games

6 = (417 + 400 * (1 - 2)) / 3)

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