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Re:When Grandmasters Blunder: Even the best make mistakes by jdoliner on Monday February 16, 2015 @11:55PM (#9060727)
This was the leading hypothesis on r/chess. I'm pretty sure it's right Naka didn't hit this rating in 2014 as far as I know.
Re:When Grandmasters Blunder: Even the best make mistakes by komaromy on Tuesday February 17, 2015 @12:01AM (#9060738)
The only other candidate would be Carlsen when he dipped to the high 2850s.