Event: Div 4 - Athenaeum Cup

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Opponent	Rating	Result
Anthony G Steele	1557	0 - 1
Tom Key	1598	0 - 1
Peter T Sharpe	1666	0 - 1
Richard Lunt	1487	0 - 1
Oliver West	1543	0 - 1
Luke J James	0	0 - 1
Ethan Fenton	1379	1 - 0

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

1033 = (9230 + 400 * (1 - 6)) / 7)