Event: Open County Championship

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Opponent	Rating	Result
Haroon Majeed	1955	0 - 1
Okwose Marc Obi	1938	0 - 1
Mark Lim	1934	½ - ½
Edward Matthewson	1956	1 - 0
Kevin J Williamson	1953	1 - 0
Benjamin PQ Collinson	2072	½ - ½

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

1968 = (11808 + 400 * (2 - 2)) / 6)