Event: A Division

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Opponent Rating Result
Gareth NR Griffiths 1733 1 - 0
Michael Tebelev 1921 0 - 1
Daniel Okorafor 1800 0 - 1
Ondrej Chalupa 1829 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1721 = (7283 + 400 * (1 - 2)) / 4)

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