Two seconds for this winning move.
1. g1f3  1... g8f6  2. g2g3  2... d7d5  3. f1g2  3... e7e6  4. e1g1  4... f8e7  5. c2c4 After a short flirt with the open games against Carlsen, Artemiev returns to his bread and butter—the Reti. 5... d5d4  6. e2e3  6... c7c5  7. e3d4  7... c5d4  8. f3e5 It is a reversed Benoni and besides the first move advantage White has one more hidden tempo—the black e-pawn only moved to the sixth rank. Thus, why not play more actively? 8... d8c7 Mamedyarov tries to fight the annoying knight at once and does it with a novelty. 9. f1e1  9... e7d6  10. d1e2  10... b8d7 This is where things really started to go downhill for the Azerbaijani GM. 11. e5f3 Justified both tactically and positonally. The black pieces are stepping on each others' toes, therefore Artemiev does not plan to free them with trades. 11... c7b6  12. b1a3 The d4 pawn is in huge danger, and the white pieces are entering the battle with clear aims. 12... d6c5  13. d2d3 Once more White is tactically alert. 13... e8g8  14. c1f4 Practically paralyzing his opponent with natural moves. 14... a7a6  15. a1b1  15... c5b4  16. f4d2 Lifting the blockade. 16... e6e5 In his younger days Mamedyarov played countless games with his friend and Benoni expert Vugar Gashimov. He certainly knows what kind of a mess he is into, and tries to escape tactically. 17. d2b4 Very consistent play again. 17... b6b4  18. a3c2  18... b4a5  19. f3e5 After the burst of activity: 19... f8e8  20. f2f4  20... d7e5  21. f4e5  21... f6g4  22. b2b4 Artemiev cools things off. 22... a5b6  23. e2e4  23... b6h6  24. h2h3  24... g4e5  25. e4f4 Another little finesse to discombobulate the black pieces a bit. 25... h6d6  26. f4d4  26... d6f6  27. e1e3 Covering everything. Artemiev calculated everything with precision. 27... c8h3 