Event: Summer League

Opponent Rating Result
Ken McGuinness 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 1)) / 1)

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Opponent Rating Result
Jacob Colbeck 0 1 - 0
Paul T Costello 1489 1 - 0
Ross McDonald 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

896 = (1489 + 400 * (3 - 0)) / 3)