Event: Div 2 - Weston Trophy

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Opponent	Rating	Result
Ken Hunter	1765	0 - 1
Ken Hunter	1765	0 - 1
Steve Withington	1717	0 - 1
Kevin R Marshall	1785	0 - 1
John R Mercy	1800	0 - 1
Paul L Cheshire	1674	1 - 0
Alperen A Kocsoy	0	0 - 1
Hashim Tuffaha	0	1 - 0

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

1113 = (10506 + 400 * (2 - 6)) / 8)