1. h1g3 Undoubtedly the most unpleasant move for Black. As I've written before, I usually like to start my games by opening the path for my bishops or queen, and in that sense 1.f4 or 1.c4 is the most natural. In this position, however, it's possible to exploit the weakness of the g7-pawn. 1... g7g6 Black cannot maintain symmetry, as 1...Ng6 loses immediately. The threat of Ng3-h5 must be avoided. Later Carlsen chose 1...f6 here, which seems a little passive to me. 1...f5 is my favorite move. 2. b2b4  2... f7f5  3. c2c4  3... e7e5  4. f2f3 The best way to complete the development. The plan is to play Bf2 and then castle. 4... d8h4 Nepomniachtchi decides to activate his pieces, but the plan goes awry. 5. g1f2  5... a8b6  6. c4c5  6... b6d5  7. e2e4  7... d5f4  8. e1f1  8... g8e6  9. a1b3 Black's queen is totally out of play, and the position is about to open. 9... h8f7  10. d2d4  10... c7c6  11. e4f5  11... g6f5  12. g3f5  12... h4f2  13. f1f2  13... e6f5  14. b1f5  14... e8c8 This is Black's idea. I never get tired of admiring the surprise factor of castling in some Fischer Random positions. The plan is to get an attack as compensation for the lost pawn. 15. d1c2 A strange move by Carlsen's standards. Black's king position is also not very secure, and this could be exploited. 15... e5d4  16. b3d4  16... d8e8  17. c1d1  17... f7e5  18. f5h7 Carlsen probably didn't see a suitable alternative, but the computer indicates that it would be better to sacrifice the queen. 18... f8h8  19. h7f5  19... e5c4 Nepomniachtchi is especially strong in positions where he has the initiative. He calculates very well, and his play has imagination and precision. It seems dangerous to drop the d7-pawn unprotected, but Black's attack comes first. He has his eye on the h2-pawn and also threatens a knight leap to e3. 20. d4c6 This loses, but the best move is hard to spot. 20... f4e2  21. f2e2  21... b8h2  22. g1f1  22... h2h1  23. f1f2  23... e8e2  24. f2e2 