Error reading move: Ng3 In order to spoil the opponent's  castling. Here we are, in some Queen's Indian symmetrical set-up. Back to  normal chess. Now the game enters Carlsbad theritory where Carlsen can be  happy with the trade of the light-squared bishop. Minority attack to  create queenside weaknesses. This is the reason why, Carlsen is prepared  for the opening of the c-file. And this is typical for the Nimzo-Indian  defense. Above all, Black stops the usual kingside play of the opponent  after f2-f3 and g2-g4! Now that the b and the c-pawns have been traded it  is time for So to play in the center. The center is ready to start moving  and Carlsen uses tactics to attack it first. Now Black can take it and  this was his idea. But in the process the long diagonal for the white  pieces is opened and this spells trouble for the world champion. Without a blink of an eye! So starts a dangerous kingside attack. Flashy, but not  optimal.
1. d2d4 