Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
John A Clark	1771	1 - 0
Farshad Ai	2013	½ - ½
Will Taylor	0	½ - ½
Ken A McIntosh	1825	½ - ½
Geoff Frost	1863	½ - ½
Khaled Muflehi	1960	0 - 1
Andrew Butterworth	2002	½ - ½

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

1633 = (11434 + 400 * (1 - 1)) / 7)