Event: Div 4 - Athenaeum Cup

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Opponent	Rating	Result
Joshua Tedder	0	0 - 1
Thomas Hancock	1598	1 - 0
Jonathan Ferguson	1501	½ - ½
George Gledhill	0	½ - ½
John Wiles	0	½ - ½
Rosie Irwin	1169	0 - 1
Alex Thorp	1389	1 - 0

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

808 = (5657 + 400 * (2 - 2)) / 7)