Event: Summer League Division 4

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Opponent	Rating	Result
Jamie Wright	1696	0 - 1
Michael P Freund	1632	0 - 1
Andrew Nettleship	1551	0 - 1
Ian Barker	1538	0 - 1
James Crookes	1621	1 - 0
David Burn	1600	1 - 0
Mark Kirkham	1483	½ - ½
Marko Vukasinovic	0	1 - 0

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

1340 = (11121 + 400 * (3 - 4)) / 8)