Event: OTB HBZGP 8v8

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Opponent Rating Result
Eitan Eisen 1080 0 - 1
A Fin O'Regan 983 0 - 1
Michael Parker 1043 1 - 0
Haci Donar 1219 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

881 = (4325 + 400 * (1 - 3)) / 4)

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