Event: Challengers

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Opponent Rating Result
Yury Krylov 0 0 - 1
Alex Halstead 0 0 - 1
Dariusz Sikora 1704 1 - 0
Martin Ginestie 1643 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

637 = (3347 + 400 * (1 - 3)) / 4)

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