1. g1f3  1... g8f6  2. g2g3  2... g7g6  3. b2b3 Carlsen decides not to enter into a theoretical battle in the opening and chooses the calm double fianchetto variation. 3... f8g7  4. c1b2  4... d7d6  5. f1g2  5... e7e5  6. d2d3  6... e8g8  7. c2c4 White's system is harmless for an elite classical game, but in rapid a normal position is enough to fight for a win. 7... a7a5  8. b1c3  8... h7h6 This move is new. There are many ways for Black to play and possibly 8...c6 is the most accurate, since there's no clear use for the h-pawn advance at the moment. 9. e1g1  9... c7c6  10. e2e4  10... f8e8  11. f1e1  11... b8a6  12. h2h3  12... c8d7 Too slow. 13. d3d4  13... e5d4  14. f3d4  14... a6c5 By somewhat tortuous paths, the position has reached a typical battle of the King's Indian fianchetto variation. White has more space and the possibility of attacking the d6-pawn or advancing with f2-f4, g3-g4 and so on. Black has the strong bishop on g7 and some chances of counterattack on the queenside. 15. d1c2  15... d8c8  16. g1h2  16... f6g4  17. h3g4  17... g7d4  18. a1d1  18... d4g7  19. f2f3 White's pawns have lost some of their mobility, but the rest of the advantage is maintained: more space and the possibility of attacking on d6. White should still be alert to always have the option of responding to a5-a4 with b3-b4.