Event: The Friendly League

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Opponent Rating Result
Oliver Wilson 0 1 - 0
Dave S Almond 1737 0 - 1
Robert Grounds 1173 1 - 0
Abbas Ahmed 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

928 = (2910 + 400 * (3 - 1)) / 4)

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

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