Event: Open County Championship

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Opponent	Rating	Result
Michael T Botteley	1968	1 - 0
Paul P Smith	2042	½ - ½
Stephen Lewis	1896	½ - ½
Thomas P O'Brien	2133	½ - ½
Benjamin PQ Collinson	1986	0 - 1
John A Feavyour	1854	½ - ½

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

1980 = (11879 + 400 * (1 - 1)) / 6)