Event: Parkinson

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Opponent Rating Result
Nick Mullan 106 0 - 1
Christopher J Edwards 0 ½ - ½
Mike J Barnett 135 1 - 0
Keith Marsh 123 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-9 = (364 + 400 * (1 - 2)) / 4)

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