The point is that the white pieces cannot stay in the center for  long.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... f8b4  5. b1d2  5... e8g8  6. f1g2  6... b7b6  7. e1g1  7... c8b7  8. f3e5  8... a7a5  9. d1c2  9... a5a4  10. f1d1 This natural move is a novelty. The rook is  entering the battle while at the same time it overprotects the center. 10... b4d6 A useful retreat. 11. c4d5  11... e6d5  12. d2c4 Still good! 12... h7h6 Now, in comparison  with the line from above, it is Dubov's move. 13. c1f4 Playing for the  maximum. 13... f8e8  14. a1c1  14... b8a6  15. a2a3 The same policy of mounting more  pressure. The b4-square is under White's control, and the black knight is  stranded. Most likely this is how Carlsen would have played had he had the white pieces. 15... d6f8  16. c4e3  16... c7c5 Now the world champion frees himself a bit. 17. e3f5  17... c5d4  18. e5c6 But Dubov keeps the initiative and offers an  interesting pawn sacrifice. 18... d8d7  19. g2h3  19... g8h8 Which Carlsen  rejects. Alas, this is a big mistake. 20. c6e5 Winning material. 20... e8e5  21. f4e5  21... f6e4  22. e5d4 Dubov not only won the exchange, he also kept the  initiative. However, Carlsen is not the world champion for just one reason and as we will witness, it's not over yet. 22... a8c8  23. c2d3  23... a6c5  24. d3e3  24... h8h7  25. d4c5  25... e4c5  26. e3f3  26... d5d4 Initiative! Attack! One more pawn does not make Black's  position more lost material-wise, but it can provide a highway to the  white king and a chance for Dubov to go wrong. 27. d1d4  27... d7e8 Attack no  matter what! 28. f3e3  28... e8c6  29. f2f3 The long diagonal is locked, but the adjacent one has  been opened. And white does not have a bishop to defend it... 29... c8e8  30. e3f2  30... g7g6 Suddenly, the white pieces become clumsy. 31. f5e3  31... c6f6  32. e3g4 