Event: Open County Championship

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Opponent	Rating	Result
John A Feavyour	1855	1 - 0
Dominic Watson	1804	1 - 0
Benjamin PQ Collinson	2072	½ - ½
Timothy Lunn	2060	1 - 0
Graham E Borrowdale	2008	1 - 0
Vivash Samarakoon	0	1 - 0

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

1967 = (9799 + 400 * (5 - 0)) / 6)