Event: County Championship

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Opponent	Rating	Result
William Pennell	0	½ - ½
Denis Georgiou	0	½ - ½
Stephen CV Prior	0	0 - 1
James Irwin	0	½ - ½
Paul A Hutchinson	0	0 - 1

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

-160 = (0 + 400 * (0 - 2)) / 5)