1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. e1g1  4... d7d6  5. c2c3  5... g8f6  6. d2d3  6... a7a6  7. c4b3  7... e8g8  8. f1e1  8... c5a7  9. b1d2  9... f6g4 [%c_effect g4;square;g4;type;Interesting;persistent;true] The game becomes sharp after this knight thrust. 10. e1e2  10... g8h8  11. h2h3  11... g4h6  12. d2f1  12... f7f5  13. c1g5 [%c_effect g5;square;g5;type;GreatFind;persistent;true] The most accurate. Carlsen certainly knows all the details of this position. I saw with my own eyes him playing this as Black in Brazil. This happened in 2014, an unforgettable year for us Brazilians, due to this visit of the then world champion and for a sporting event that I prefer not to remember. The memory feats of world champions like Fischer, Kasparov, and Carlsen are well documented—they are said to be able to remember almost every game they've played. Whether it's true or not, I don't know, but based on the quality of the next moves, I believe he remembered this opening well. 13... d8e8  14. g5h6  14... g7h6  15. d3d4 [%c_effect d4;square;d4;type;GreatFind;persistent;true] It's easy to notice why 12.Bg5 is a clever move: the queen is not comfortable on e8, right in the sight of white's rook. 15... f5e4  16. e2e4  16... e8g6 [%c_effect g6;square;g6;type;Inaccuracy;persistent;true] 17. f1g3  17... c8d7  18. b3c2 [%c_effect c2;square;c2;type;Inaccuracy;persistent;true] This is a new and not good move. Considering that Carlsen plays the right idea with incorrect timing, I have the firm theory, totally generated by my imagination, that he confused his analysis. 18... g6g7  19. d1d2 White prepares to bring the a1-rook to the game, but this move allows the exchange sacrifice on f3. 19... f8f3 Though objectively this move deserves a dubious mark, I won't dare criticize it as it looks so tempting from a human point of view. If I were playing against a mortal and without looking at the heartless machine's critical assessment, I might even already feel like I'm winning with Black here. Nothing is further from reality. 20. g2f3  20... e5d4  21. g1g2 A good move. 21... d4c3  22. b2c3  22... c6e5  23. f3f4 [%c_effect f4;square;f4;type;Mistake;persistent;true] This move not only squanders the advantage, but it also puts White in a very dangerous position. 23... e5g6  24. a1e1 [%c_effect e1;square;e1;type;Mistake;persistent;true] Losing on the spot. 24... g6h4 [%c_effect h4;square;h4;type;GreatFind;persistent;true] Much better than 25. g2h1  25... h4f3 Knights are tricky pieces. 26. d2d5  26... f3e1  27. d5b7  27... a8g8  28. b7a7 