Event: Open

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Opponent	Rating	Result
Golam S Ali	1942	0 - 1
Jon Turner	1728	0 - 1
Tony Preece	1792	1 - 0
Jonathan Dale	1893	1 - 0
Golam S Ali	1942	0 - 1
Jon Turner	1728	0 - 1
Tony Preece	1792	½ - ½
Jonathan Dale	1893	0 - 1

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

1689 = (14710 + 400 * (2 - 5)) / 8)