Event: Welcome Back Rapidplay

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Opponent Rating Result
Mihai Horia Zbircea 1836 0 - 1
Eddy Porton 916 1 - 0
David Smith 1677 0 - 1
Ben Attwell 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

907 = (4429 + 400 * (1 - 3)) / 4)

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