Before  capturing on g6 Carlsen wants to make sure that his opponent has zero  counterplay.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. d2d4 Carlsen is tired of the Berlin. 3... e5d4  4. f3d4  4... f8c5  5. d4c6  5... d8f6  6. d1f3  6... d7c6  7. b1c3  7... c8e6  8. c1e3  8... c5b4  9. e1c1 An interesting pawn sacrifice which Black rejects. 9... f6f3 Played after a lengthy thought. Yes, almost six minutes  at this time control is a lot of time). 10. g2f3  10... g8e7  11. h2h4 A typical move which aims to restrict the black  knight. Carlsen can be very happy with his opening choice. He still got  some sort of a Berlin but with much better prospects on the kingside. 11... b4c3  12. b2c3  12... a8d8  13. d1d8  13... e8d8  14. h4h5 Carlsen's very old predecessor proved A long time  ago the importance of the rook pawns when helping the bishop pair.  According to Steinitz, they are idea to limit the enemy knight. 14... f7f5 At least gaining some space on the kingside. 15. c3c4 To which White keeps on improving. 15... h8f8  16. h1g1  16... f8f7  17. a2a4 The other rook pawn advances. 17... a7a6  18. a4a5  18... g7g6 