Event: A Division

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Opponent Rating Result
Chris Swales 1736 0 - 1
Stephen Halliday 1600 0 - 1
Jonathan Sams 1829 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1322 = (5165 + 400 * (0 - 3)) / 3)

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