Event: Open County Championship

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Opponent	Rating	Result
Peter AJ Brown	1998	0 - 1
Steve J Pullinger	1988	1 - 0
Graham E Borrowdale	2008	½ - ½
Anas Ibn Saifullah	1830	0 - 1
Vivash Samarakoon	0	½ - ½
Paul F Habershon	1971	1 - 0

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

1633 = (9795 + 400 * (2 - 2)) / 6)