George Duke wrote on Tue, Oct 28, 2014 09:46 PM UTC:
Carlsen mis-handles the exchanges just before Move 26 leaving R-N to B-N-N.
http://www.chessgames.com/perl/chessgame?gid=1479611.
Yet even accepting things that far, the error as such is not doing
'32 R-c8+...', check right away. Checking would gain one Pawn soon and
another Pawn eventually without letting Black start advancing.