Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Craig Chatterton	1697	½ - ½
Peter Cooper	1629	0 - 1
Jago Onians	0	½ - ½
Andrew Nettleship	1556	1 - 0
Alan Story	1498	½ - ½
Mark Watson	1460	0 - 1
Tim England	1728	1 - 0

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

1367 = (9568 + 400 * (2 - 2)) / 7)