Event: Hillingdon Div X

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Opponent	Rating	Result
Arthur Cann	1322	0 - 1
Sheldon Andreez	550	0 - 1
Kevin Mitran	1233	0 - 1

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

635 = (3105 + 400 * (0 - 3)) / 3)