Event: Parkinson

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Opponent Rating Result
Keith Marsh 123 1 - 0
John Brooke 96 1 - 0
Nick Mullan 106 ½ - ½
Mike J Barnett 135
performance = (sum(opponents ratings) + 400(wins-losses)) / games

375 = (325 + 400 * (2 - 0)) / 3)

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