1. d2d4  1... g8f6  2. g1f3  2... e7e6  3. c2c4  3... f8b4 The Bogo-Indian Defense is not very popular among the elite, but it's a great defense, especially for club-level players, as the plans are easier to understand than, for example, the Queen's Indian, one of the most positionally complex openings in chess. 4. b1d2  4... d7d5 This move has a dubious reputation, but Mamedyarov played it in the first round of the tournament and in the Olympiad as well, so it's clear he has his own opinion. 5. d1a4 This is the critical move. 5... b8c6  6. a2a3  6... b4e7  7. e2e3 The problem with Black's position is the knight on c6, which is why this line is not popular. This poor knight has such a bad reputation because it hinders the c-pawn advance and Black's development. But is this bad reputation justified $2 7... a7a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] An important move. Maybe White will move the queen to c2, and now Black is ready to advance the pawn to a4 and improve the pawn structure on the queenside. If you find this too abstract, remember that this is not a Sicilian, where the plans are usually geared toward checkmating: the game is more subtle and delicate in some defenses against the queen's pawn openings. 8. b2b4 Again, the most critical. 8... d5c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] This is Mamedyarov's idea, leading to an underexplored position that will, I believe, become popular after this game. 9. d2c4 [%c_effect c4;square;c4;type;Mistake;persistent;true] A novelty and also a rare opening error by So, one of the elite grandmasters with the best theoretical preparation out there. 9... b7b5 [%c_effect b5;square;b5;type;Brilliant;persistent;true] Now Black has a very strong counterplay. 10. a4b5  10... c8d7  11. b5g5 This move seems forced to human eyes, but actually, there is an alternative. 11... a5b4  12. g5g7 [%c_effect g7;square;g7;type;Mistake;persistent;true] Now White is lost. 12... h8g8  13. g7h6  13... b4a3 The queen is out of play, and the g8-rook makes it difficult for White to complete his development, as we will see. 14. f1e2  14... g8g2 White's king has nowhere to hide. 15. f3e5  15... c6e5  16. c4e5  16... g2g8 [%c_effect g8;square;g8;type;GreatFind;persistent;true] 17. e2f3  17... d8b8 [%c_effect b8;square;b8;type;GreatFind;persistent;true] Mamedyarov plays with great precision. He brings the queen to the attack and is not afraid of sacrificing the exchange. 18. e3e4  18... b8b3  19. h6e3  19... e7b4  20. c1d2  20... b3b2 [%c_effect b2;square;b2;type;GreatFind;persistent;true]