Now it is QGA when White is a little  better thanks to the extra tempo in a symmetrical position. White finds  the optimal square for his knights. The only problem with this plan is  that he cannot seize the a3-f8 diagonal with his bishop. Whereas Carlsen  is patiently building a wall against the opponent's bishop on the long  diagonal. In the meantime, the diagonal for his second bishop is cleared.  "Too optimistic" (Kasparov). This is a standard idea to prolong a  diagonal, but unfortunately for him, White will soon have no piece to  attack there. Missed by Kasparov. "I wanted to play g4-g2." Without the  dark-squared bishop, everything that White had done so far makes little  sense, and the pawn advance g2-g4 turns into a weakness. White is  desperately trying to repair the damage he has done to his kingside. The  pawn on g5 is a future weakness and should be kept alive. Carlsen allows  his opponent a chance to connect the pawns.
1. d2d4  1... d7d5  2. e2e3  2... g8f6  3. g1f3  3... e7e6  4. c2c4  4... a7a6  5. b1c3  5... d5c4  6. f1c4  6... c7c5 