Event: County Championship

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Opponent	Rating	Result
Richard Stokes	0	0 - 1
Nathan O'Reilly	0	1 - 0
Jules Brown	0	0 - 1
Herman FF Kok	0	0 - 1
Paul Fischer	0	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-80 = (0 + 400 * (2 - 3)) / 5)