Event: Open

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Opponent Rating Result
Wojciech Czopek 154 1 - 0
Shahab U Quraishi 163 1 - 0
Robert Marks 144 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

287 = (461 + 400 * (2 - 1)) / 3)

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