Event: Parkinson

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Opponent Rating Result
John Brooke 96 0 - 1
Keith Marsh 123 1 - 0
John K Holliday 141 0 - 1
Nick Mullan 106 ½ - ½
Simon Johnson 141
performance = (sum(opponents ratings) + 400(wins-losses)) / games

17 = (466 + 400 * (1 - 2)) / 4)

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