Event: County Championship

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Opponent Rating Result
John Grasham 0 ½ - ½
Andrew T Watson 0 ½ - ½
Bernard Pratten 0 0 - 1
Jason Golding 0 1 - 0
Piotr Kaszynski 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

80 = (0 + 400 * (2 - 1)) / 5)

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