Event: Division 4

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Opponent Rating Result
Alan Spark 1549 1 - 0
David Carter 1524 1 - 0
Bethany Mawby 1356 1 - 0
Jonathan Cartwright 1504 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1683 = (5933 + 400 * (3 - 1)) / 4)

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