Event: Barclays Chess Club Rapid Tournament No. 1/2012

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Opponent	Rating	Result
David Ritchie	0	1 - 0
Nitin Adlakha	0	0 - 1
Daniel Cardnell	0	½ - ½
Mark S Gray	0	0 - 1
James Angus	0	0 - 1

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

-160 = (0 + 400 * (1 - 3)) / 5)