1. f2f4 The opening position is begging for a Stonewall and Fedoseev quickly builds one as White. 1... d7d5  2. e2e3  2... b8c6  3. d2d4  3... e7e6  4. h1f2 One of the good options. 4... g7g5 Carlsen on his turn is fighting for the center at once. 5. c2c3  5... c8d7  6. b1d2  6... h8g6  7. d2f3  7... g5f4  8. e3f4  8... f7f6  9. f1e2 And now it is a weird-looking French construction. 9... d8e7  10. d1b3  10... f8f7  11. f2d3 The optimal position for the knight. From here it stops the central e6-e5 breakthrough, protects the f4-pawn, and is ready to visit the c5-square some time in the future. Or some other square $2 11... e8a8  12. c1e3  12... c6a5 This knight does not have a problem finding a good spot. 13. b3c2  13... a5c4  14. e1a1  14... e7d6 Carlsen has achieved a more or less equal position, but it somehow feels itchy as his other knight does not have a career. 15. g1f1  15... c4e3 Gaining the bishop pair, and maybe a tempo or two for the improvement of the other knight. 16. e2e3  16... g6e7 For now Fedoseev finds a way to complicate matters. 17. d3e5 Spectacular $1 17... f6e5  18. f4e5  18... f7g7 Carlsen spent more than two valuable minutes on this decision. 19. f1f2  19... h7h6  20. e5d6  20... c7d6  21. d1g1 Now it is a reversed Najdorf-like type of position where White's play is easier. g2-g4 is on the agenda. 21... e7c6  22. c2a4 It would be good to swap off the black knight. 22... c6a5 But Carlsen will not allow this.