1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. c4d5  4... f6d5  5. c1d2  5... d5b6  6. e2e3  6... f8g7  7. h2h4 Harry and George, Duda's favorite buddies. He uses any given moment to push them forward and these guys often help him discover the enemy king and mate it. If we have to be more serious, h2-h4 is a trendy idea in almost every single Semi-Open game and the fianchetto Gruenfeld definitely helps. 7... c7c5 A novelty in return. This temporary pawn sacrifice is often a no-brainer for the Gruenfeld player. 8. d4c5  8... b6d7  9. c3a4 This might not be the most accurate though. 9... b8c6  10. h4h5  10... e8g8 Now Mamedyarov can castle, his king is way safer. 11. h5g6  11... h7g6  12. d1g4 Duda still has no other plan but to mate. 12... d7f6  13. g4h4  13... d8d5 Centralization helps Black repel the attack and create threats on his own. 14. g1f3  14... c8g4 Mamedyarov starts creating threats of his own. 15. d2c3  15... f8d8 Frees the f8 square for the king with a tempo. 16. f1e2  16... d5e4  17. b2b3 Now Black even takes over the initiative. 17... c6b4  18. e1f1  18... d8d5 That is the problem! The rook can be centralized as well and Mamedyarov is counter-attacking now. 19. f1g1 This solid move should have lost all of a sudden. 19... b4c2 But obsessed with the idea of a sacrifice on e3 Mamedyarov misses a clear win. 20. a1f1  20... a8d8 A second miss, and this time things become grim for the Azeri GM. 21. e2c4 Finally, it will be the black king that will suffer. 21... d5d1  22. f3g5 So far Duda is accurately conducting the attack. 22... d1f1 At least diverting the bishop for a moment. 23. c4f1  23... e4f5  24. a4b2 White secures the back rank, but this allows Mamedyarov one final chance. 24... g4h5 Now Black stands no chance. 25. f1c4  25... e7e6  26. e3e4 Decentralizing the queen and that is more than enough for Duda. 26... f5c5  27. g5e6 The final blow. 27... f7e6  28. c3f6  28... d8d2  29. c4e6  29... g8h7  30. f6g7  30... h7g7  31. h4f4 Forcing the queen trade, a practical convertion. 31... c5d6  32. f4d6  32... d2d6 