Event: A Division

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Opponent Rating Result
John S Garnett 1959 0 - 1
Stephen Rodgers 1677 1 - 0
Richard VM Hall 2007 0 - 1
Matthew Holton 1890 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1883 = (7533 + 400 * (2 - 2)) / 4)

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