1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... f8b4  5. c1g5  5... h7h6  6. g5f6  6... d8f6  7. e2e3 In the Ragozin defence both players follow an earlier game of theirs, played six years ago. 7... e8g8  8. a1c1  8... d5c4  9. f1c4  9... c7c5  10. e1g1  10... c5d4  11. c3e4 That is still the previous game. 11... f6e7  12. f3d4 Only here does Mamedyarov deviate. He decided to try and win without any strategical risk, in a symmetrical position. 12... c8d7  13. c4e2  13... b8c6  14. a2a3  14... b4a5  15. d4b3  15... a5b6 All of this has been seen before and White comes with a logical novelty. 16. d1d6  16... e7d6  17. e4d6 In this symmetrical position it is often all about the outposts on the sixth (third) rank. If White has enough time to support this knight with e3-e4-e5 he would secure serious edge. Therefore Carlsen needs to hurry and chase it away as soon as possible. 17... a8b8  18. f1d1  18... f8d8 All very logical; the black king is on route to the perfect e7-square. 19. b3c5  19... b6c5  20. c1c5  20... g8f8 No time do get deep into the details and Black follows his plan. 21. b2b4 It is time to trouble the black pieces. 21... c6e7 The best move despite the delay. True, the white pawn is no longer hanging on the b2-square, but there is nothing more constructive than this. 22. e3e4  22... d7a4  23. d1d3  23... e7c6 Carlsen is slowly bringing his pieces out, but he has to watch out for the e4-e5 plan carefully. 24. f2f4  24... b7b6 Possibly blundering White's next idea. 25. c5c3  25... e6e5  26. e2d1 That is the difference, after 26... a4d1  27. c3c6 Mamedyarov clears the more valuable piece, wins a pawn, and above all-gets an access to the seventh rank. 27... d1a4  28. c6c7  28... e5f4  29. c7f7  29... f8g8 