Event: Barnett / Parkinson

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Opponent Rating Result
Lee Crawford 1853 0 - 1
Colin S Procter 1782 1 - 0
Paul G Day 1701 0 - 1
Samir Cradock 1803 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1585 = (7139 + 400 * (1 - 3)) / 4)

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