Event: Summer KO

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Opponent Rating Result
J Dave H Hair 1715 ½ - ½
Hanif Zaman 1669 1 - 0
Stefan Hartmann 1905 ½ - ½
Andrew Burnett 2233 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1881 = (7522 + 400 * (1 - 1)) / 4)

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