Event: Hillingdon Div 3

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Opponent	Rating	Result
Harriet Cann	561	1 - 0
Ashley K Anderson	1004	½ - ½
Shreya Sawant	397	1 - 0

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

921 = (1962 + 400 * (2 - 0)) / 3)