Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Andrew Birtwhistle	1752	0 - 1
Nigel Baxendale	1648	0 - 1
Nigel Baxendale	1648	0 - 1
Kevin Keenan	1725	0 - 1
Peter Cooper	1629	0 - 1
Steve Withington	1681	0 - 1
Hashim Tuffaha	1504	0 - 1
Joshua Tedder	1584	1 - 0
Rajen M Parekh	0	½ - ½
Richard F Hall	1743	1 - 0

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

1291 = (14914 + 400 * (2 - 7)) / 10)