Event: County Championship

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Opponent	Rating	Result
Nathan O'Reilly	0	1 - 0
John Grasham	0	1 - 0
George Anderson	0	½ - ½
William J Egan	0	½ - ½
Robert J Arthurton	0	½ - ½

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

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