Event: Div 1 - Davy Trophy

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Opponent	Rating	Result
Chris N Ross	2220	½ - ½
Miles D Edwards-Wright	2098	0 - 1
Michael R Handley	2089	½ - ½
Peter Micklethwaite	2009	1 - 0
Michael R Handley	2089	1 - 0
John T Fletcher	2028	0 - 1

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

2089 = (12533 + 400 * (2 - 2)) / 6)