When Viswanathan Anand blundered at the end of game 2, it was in a position that was very difficult and possibly lost against best play. Today, however, Magnus Carlsen blundered in a position that was clearly better, and had Anand spotted it the tables would have been turned. As so often happens, Carlsen realized his mistake the instant after he made his move, and unfortunately for Anand it was only after he made his reply that he spotted the missed opportunity. (Carlsen's 26.Kd2?? allowed 26...Nxe5, e.g. 27.Rxg8 Nxc4+ 28.Kd3 Nb2+ 29.Ke2 Rxg8 30.g3 and although White will reclaim one of the two missing pawns Black has excellent winning chances.)
After the exchange of errors Black's position remained difficult but defensible, but Anand did not make the most of his chances. In particular, ...Ba4 was a good idea, but according to the players it needed to be prefaced by ...Ne7. After 31...Ba4 32.Be4+ Bc6 Black started bleeding pawns left and right, and when he resigned he was on the verge of going five pawns(!) down. In fact Black had an incredible defensive resource - see the PGN file (link below) for the details - but it would have been very difficult to spot.
Going back to the beginning, the opening was rather a surprise. Anand's decision to repeat the Sicilian with 2...e6 was not a shock--the last game was successful and this was after all the variation I had suggested. Carlsen went for an Open Sicilian - a mild surprise - and one would think that this was just the sort of thing Anand wanted. Here, however, Anand chose a line with an early queen trade and wher Black is passive, immediately going into a two-results position where neither of the results (well, except in the case of a blunder!) is a Black win. If Anand had achieved a position that was (at least) objectively good or really and clearly worked out to a draw out of the opening one could make an argument for this strategy, but that clearly wasn't the case.
The players have a rest day tomorrow, and game 7 will be on Monday with Carlsen again having the white pieces. Meanwhile, you can replay the game, with my relatively light comments, here. (As usual, subscribers will receive the more detailed annotations and the video later today.)