Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Steve Withington	1681	0 - 1
Peter J Hoare	1666	0 - 1
Ron Keenan	1562	½ - ½
Nigel Baxendale	1648	1 - 0
Richard F Hall	1743	0 - 1
Marawan Shaaban	1730	0 - 1
Lance Kennedy	1491	0 - 1
Tom R W Edwards	1444	1 - 0
Hashim Tuffaha	1504	½ - ½

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

1474 = (14469 + 400 * (2 - 5)) / 9)