Carlsen plays for domination and shuts the black bishop down... 
1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. c4d5  4... f6d5  5. e2e4  5... d5c3  6. b2c3  6... f8g7  7. f1c4  7... c7c5  8. g1e2  8... b8c6  9. c1e3  9... e8g8  10. h2h4  10... d8a5  11. e1g1  11... c8d7 A normal developing move and a novelty. 12. a1b1 Carlsen is immediately profiting from the weakening of the  b7-pawn. 12... a5c7  13. h4h5  13... c5d4  14. c3d4  14... a8d8 A tricky move.