Event: Walker Shield

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Opponent	Rating	Result
Darren Coker	40	0 - 1
Robert Twigg	77	0 - 1
Fredy Reber	58	0 - 1

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

-342 = (175 + 400 * (0 - 3)) / 3)