[Event "Grand Prix Hamburg 2019"] [White "Duda, Jan-Krzysztof"] [Black "Grischuk, Alexander"] [Site "Hamburg"] [Round "4.6"] [Annotator ""] [Result "1/2-1/2"] [Date "2019.11.17"] [WhiteElo "2734"] [BlackElo "2759"] [PlyCount "89"] 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Ba4 c6 6. Nxe5 d5 (6... d6 7. Nf3 Bg4 )7. d3 { C48: Four Knights: 4 Bb5, replies other than 4...Bb4} Bc5 (7... Bd6 {} 8. f4 0-0 (8... Bc5 9. exd5 0-0 10. dxc6 bxc6 11. h3 Re8 12. Qd2 Nd7 13. Kd1 Nxe5 14. fxe5 Rxe5 {1-0 (79) Wei,Y (2706)-Rodshtein,M (2654) Tsaghkadzor 2015} ))8. 0-0 0-0 9. Kh1 ({ White should try Predecessor:} 9. exd5 Nxd5 10. Ne4 Bb6 11. c3 Ne6 12. Qh5 Ndf4 13. Qf3 Ng6 14. Nc4 Bc7 {1-0 (35) Dobrowolny,R-Prochazka,H Brno 1921} )Qc7 (9... Re8 10. f4 b5 )10. f4 b5 11. Bb3 a5 12. a3 Nxb3 13. cxb3 Bd4 14. Nf3 Bxc3 15. e5 Bxe5 16. fxe5 Nd7 17. Bf4 Nc5 18. Rc1 Ne6 19. Qd2 c5 20. d4 c4 21. Nh4 Qd8 22. Bg3 Ng5 23. Nf3 Ne4 24. Qe3 Bf5 25. Be1 Rc8 26. h3 h6 27. Nd2 Bg6 28. Nxe4 Bxe4 29. Bd2 Rc6 30. a4 Rg6 31. Rf2 Qh4 32. Kh2 Rb8 33. axb5 (33. Bxa5 bxa4 34. bxc4 )Rxb5 34. bxc4 Rxb2 35. Rcf1 a4 36. g3 {} Qe7 37. c5 Rb3 38. Bc3 a3 39. Ra1 Ra6 40. Qc1 f6 41. Rfa2 fxe5 42. Bd2 exd4 43. c6 Qd6 44. Bf4 Qxc6 45. Rxa3 1/2-1/2