context: 1. d2d4  1... d7d5  2. g1f3  2... c7c5  3. c2c4  3... c5d4 An interesting position and not well-known at amateur level. It's not easy to demonstrate an advantage for White in this opening. 4. c4d5  4... g8f6  5. f3d4  5... f6d5  6. e2e4  6... d5f6  7. f1b5  7... c8d7  8. b1c3  8... e7e5 The most accurate. 9. b5d7  9... d8d7  10. d4f5  10... d7d1  11. e1d1  11... b8c6  12. c1g5 The most natural attempt. 12... f6g4  13. d1e2  13... f7f6  14. g5h4  14... h7h5  15. f2f3  15... g4h6  16. h4f2 It's good for White to allow the capture on g5, gaining the e4-square. 16... h6f5  17. e4f5 We're not used to seeing Carlsen lose a slightly better endgame, but what can I say $2 There are no supermen. 17... e8c8  18. h1d1  18... d8d1  19. a1d1  19... h5h4 The rook is ready to go to h5. 20. e2d3 White's king march forward. Take a good look at this piece. In some lines it can go as far as the e8-square. 20... h8h5  21. d3e4  21... h5g5  22. d1g1  22... g7g6  23. f2h4  23... g6f5  24. e4d5  24... g5g6  25. d5e6  25... f8c5  26. g1h1  26... c6d4  27. e6d5 A serious mistake. It seems that the king regretted the walk and tried to turn back. But it should have kept going forward. 27... b7b6  28. f3f4  28... c8d7  29. g2g4 A blunder. 29... f5g4 Fedoseev misses a win. 30. f4e5  30... f6e5  31. c3e4 The position is equal again. 31... d4f3  32. e4c5  32... b6c5  33. h4g3  33... g6d6  34. d5c5  34... d6d2  35. h1c1 Now the game is beyond salvation. 35... d7e6 This was certainly missed by Carlsen. The king comes to the support of the f-pawn. 36. c1c4  36... e6f5  37. c4a4  37... f3h2 Black's advanced pawns decide the game. 38. g3h2  38... d2h2  39. a4a7  39... h2b2 The win is trivial. Two pawns are better than one.