[Event "Grand Prix Hamburg 2019"] [White "Duda, Jan-Krzysztof"] [Black "Grischuk, Alexander"] [Site "Hamburg"] [Round "4.3"] [Annotator ""] [Result "1-0"] [Date "2019.11.17"] [WhiteElo "2734"] [BlackElo "2759"] [PlyCount "89"] 1. c4 e5 2. Nc3 Nf6 3. g3 Bb4 4. Bg2 0-0 5. Nf3 Re8 6. 0-0 e4 7. Nd4 Nc6 8. Nc2 Bxc3 9. bxc3 d5 10. cxd5 { A29: English Opening: Four Knights Variation with 4 g3} Qxd5 11. Ne3 Qh5 12. f3 {The position is equal.} Ne5 (12... exf3 13. exf3 Ne7 14. f4 Qxd1 15. Rxd1 Nf5 16. Rb1 Nxe3 17. dxe3 h5 {½-½ (33) Li,C (2703)-Bu,X (2726) China 2018} )13. fxe4 { Threatens to win with Rxf6!} Neg4 14. Nxg4 {} Bxg4 15. Qc2 {} Bxe2 16. Rf5 Bd1 17. Qb1 {} Qe2 18. Rf2 {} ({Predecessor:} 18. Qxb7 {} )Qh5 { White must now prevent ...Ng4!} 19. Rf5 Qe2 20. Rf2 (20. Rf4 {} )Qh5 {} 21. h3 { aiming for d4. White has some pressure.} Rad8 {} (21... Qg6 {} 22. d3 Ba4 )22. d4 {} (22. Qxb7 Bc2 {} )Ba4 {} 23. Qxb7 (23. e5 { has better winning chances.} )Qa5 {} (23... Qd1+ { was necessary.} 24. Rf1 Qd3 )24. e5 {} Nd5 25. Bd2 Qb5 26. Qxb5 ({ But not} 26. Qxa7 {} Ra8 {} )Bxb5 27. Bg5 Rd7 28. Rc1 { Strongly threatening c4.} Bc4 29. Rb2 h6 30. Bd2 a5 31. a4 c5 32. Rcb1 Red8 33. Rb8 ({ Don't play} 33. dxc5 {} Rc7 )Bd3 {} (33... cxd4 34. cxd4 Nb4 35. Rxd8+ Rxd8 )34. R1b7 Rxb8 35. Rxb8+ Kh7 36. dxc5 Bc4 37. Be4+ g6 38. c6 Rc7 39. Rd8 Nb6 {} 40. e6 {} Bxe6 41. Bf4 Rc8 42. c7 Nxa4 43. Bb7 Nb6 44. h4 a4 (44... g5 {} 45. hxg5 hxg5 46. Bxc8 Nxc8 47. Bxg5 a4 )45. Bxc8 { Accuracy: White = 76%, Black = 37%. } 1-0