White wants to prove that the  open files are worth the pair of excellent pawns.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... e8g8  5. f1d3  5... c7c5  6. g1e2  6... d7d5  7. a2a3  7... b4c3  8. b2c3  8... d5c4  9. d3c4  9... d8c7 One of Nimzo-Indian tabias. 10. c4a2 This is  Carlsen's preferred choice. 10... b7b6  11. e1g1  11... c8a6  12. c1b2  12... b8c6  13. a1c1 [#] 13... a8c8  14. c3c4  14... c5d4  15. e3d4  15... c7e7 The queen is stepping out of the X-raying rook  on c1 as Black intends to start pressuring the hanging pawns. However  Carlsen goes for the standard: 16. d4d5 advance, which is coupled by  the not-so-standard: 16... e6d5 