Event: The Friendly League

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Opponent Rating Result
Con Carey 1575 0 - 1
Karl Barnsley 0 1 - 0
Yousaf Ahmed 0 1 - 0
Yousaf Ahmed 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

594 = (1575 + 400 * (3 - 1)) / 4)

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