Event: Steele Cup

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Opponent	Rating	Result
Mark Towlson	94	½ - ½
Darren Coker	75	½ - ½
Leon A Garfield	102	0 - 1

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

-43 = (271 + 400 * (0 - 1)) / 3)