Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Andrew Butterworth	1914	0 - 1
Nathaniel Holroyd-Doveton	1707	1 - 0
Szilard Tamas	1905	0 - 1
John A Clark	1830	½ - ½
Kier Morton	1691	0 - 1
Ewan Kershaw	1850	0 - 1
Paul Herring	1695	1 - 0

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

1685 = (12592 + 400 * (2 - 4)) / 7)