Event: Division 2

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Opponent Rating Result
Andy Johnson 1631 1 - 0
Paul L Hardstaff 1472 1 - 0
Sam Cotterill 1858 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1787 = (4961 + 400 * (2 - 1)) / 3)

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