1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. a2a3 The world champion often chooses this line against the Nimzo-Indian in blitz and rapid. 4... b4c3  5. b2c3  5... c7c5  6. e2e3  6... b8c6  7. f1d3  7... d7d6  8. g1e2  8... e6e5 In return Giri builds the Hubner-Portisch  wall. 9. e2g3 A pawn sacrifice that Black sensibly rejects. 9... h7h5  10. h2h4 A novelty. Carlsen understands these positions in the  smallest detail and is often getting this same pawn structure as Black  when facing the Rossolimo Sicilian. 10... d8e7  11. d4d5  11... c6b8  12. e3e4 Now Black has a problem with his kingside as he cannot castle  easily. 12... c8g4 In order to lock the diagonal d1-h5. 13. f2f3  13... g4c8  14. c1g5 Nevertheless, the pin is extremely unpleasant for  Giri. 14... e7c7 He breaks it at once, but this leaves his kingside in  ruins. 15. g5f6  15... g7f6  16. e1g1  16... b8d7  17. f3f4 Black's kingside crumbles. 17... e5f4  18. g3h5  18... d7e5  19. h5f6 Forcing matters. 19... e8d8  20. f1f4  20... e5g6  21. d1f3 Excellent! The world champion is  ready to spend an exchange for the anti-blocker. By doing so he also  secures the excellent position of his knight on f6 (which is definitely  not weaker than any of the black rooks) and, yes, the h-passer remains  alive. 21... c7e7  22. h4h5  22... g6f4  23. f3f4  23... e7e5  24. f4e5 This trades the opponent's best piece  at once. 24... d6e5  25. g2g4 The steed is supported and becomes a super knight. 25... a7a5  26. g4g5  26... a8a6  27. a1b1 Carlsen wants to block the a6 rook from  entering the battle via the b6 square but forgets about something else. 27... a6f6 Finally some breathing room for the black pieces! 28. g5f6  28... h8h5  29. b1b5  29... h5h3  30. d3e2  30... h3c3 