Event: Individual Championship

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Opponent	Rating	Result
Ian A Robson	190	0 - 1
Ian D Jenkins	94	1 - 0
Kevin N Bendall	130	½ - ½
Ian P Blencowe	126	½ - ½
Robert Ashworth	159	0 - 1

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

60 = (699 + 400 * (1 - 2)) / 5)