Event: Baum Trophy summer league

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Opponent Rating Result
Will Johnson 1400 0 - 1
Will Johnson 1400 0 - 1
Vladimir Cernavskis 1731 0 - 1
Will Johnson 1400 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1083 = (5931 + 400 * (0 - 4)) / 4)

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