Event: N&N Improvers League

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Opponent Rating Result
Wayne Johnson 0 0 - 1
Paul Rees 0 0 - 1
Jonathan Mayfield 0 1 - 0
Melissa Jermey 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-200 = (0 + 400 * (1 - 3)) / 4)

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