Event: Open County Championship

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Opponent	Rating	Result
Robert R Sanders	1936	½ - ½
Paul McMahon	1918	½ - ½
Nick Collacott	1971	0 - 1
Robert R Sanders	1936	½ - ½
Christopher Hampton	1905	1 - 0
Michael T Botteley	1968	0 - 1

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

1872 = (11634 + 400 * (1 - 2)) / 6)