Event: Summer KO Group B

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Opponent	Rating	Result
Thomas Beckwith	0	1 - 0
Aaron Welson	0	0 - 1
Andrew Burnett	0	0 - 1
Ethan Tatters	0	½ - ½
Andrew Robinson	0	0 - 1

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

-160 = (0 + 400 * (1 - 3)) / 5)