Event: Div 4 - Athenaeum Cup

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Opponent	Rating	Result
Stefan Lewins	0	0 - 1
Joshua Tedder	0	1 - 0
Michael W Simmons	1152	½ - ½
Martin Wilkes	1225	1 - 0
Ian Barker	1581	1 - 0
Sarah L White	0	1 - 0
Luke W Russell	1430	1 - 0

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

998 = (5388 + 400 * (5 - 1)) / 7)