Event: Division 2

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Opponent Rating Result
Keith Baxter 1609 0 - 1
Richard J Johnson 1900 1 - 0
Alex Mckeigue 1832 ½ - ½
Mark Calverley 1469 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1603 = (6810 + 400 * (1 - 2)) / 4)

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