Event: Summer KO Group B

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Opponent	Rating	Result
John Liddle	0	0 - 1
Jounaid El Archi	0	0 - 1
Charlie Rathbone	0	1 - 0
Thomas Cameron	0	1 - 0
Ryan Fallon	0	0 - 1

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

-80 = (0 + 400 * (2 - 3)) / 5)