Event: Hillingdon Div 2

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Opponent	Rating	Result
S David Wray	1472	0 - 1
Da Cao	954	1 - 0
Robert Parsons	1745	0 - 1

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

1257 = (4171 + 400 * (1 - 2)) / 3)