Event: Open

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Opponent Rating Result
Lewis A Turner 1981 0 - 1
Julian Tarwid 1650 0 - 1
David J Farrall 1861 ½ - ½
Roland E Graf 1848 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1635 = (7340 + 400 * (0 - 2)) / 4)

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