Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Ken Hunter	1801	0 - 1
Andrew Birtwhistle	1752	0 - 1
Mark Watson	1460	1 - 0
Jago Onians	0	1 - 0
Alan S McIntosh	1810	0 - 1
Geoff Frost	1807	½ - ½
Mark Watson	1460	1 - 0
Steve Withington	1681	½ - ½
Neil Todd	1745	0 - 1
Andrew Nettleship	1556	0 - 1
Peter Locking	1615	½ - ½

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

1444 = (16687 + 400 * (3 - 5)) / 11)