Event: Open County Championship

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Opponent	Rating	Result
Stephen Lewis	1960	½ - ½
Graham E Borrowdale	2008	0 - 1
Steve J Pullinger	1988	0 - 1
Robert R Sanders	2010	½ - ½
Okwose Marc Obi	1938	1 - 0
Roy Hughes	2085	½ - ½

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

1932 = (11989 + 400 * (1 - 2)) / 6)