[Event "FIDE Grand Swiss 2023"] [Site "Douglas"] [Date "2023.10.30"] [Round "6.1"] [White "Muzychuk, Anna"] [Black "Assaubayeva, Bibisara"] [Result "1-0"] [WhiteElo "2510"] [BlackElo "2469"] [Annotator "Lang, JJ"] [Variant "Standard"] [ECO "B22"] [Opening "Sicilian Defense: Alapin Variation, Barmen Defense"] [Source "https://lichess.org/study/uDXLUcuQ/GsZi3ANW"] [Orientation "white"] 1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. Nf3 g6 5. d4 Bg7 6. Nbd2 cxd4 7. Bc4 Qd8 8. Nxd4 Nf6 9. O-O O-O 10. N2f3 Qc7 11. Qe2 Bg4 12. h3 Bxf3 13. Nxf3 Nc6 14. Be3 Na5 15. Bb3 Nxb3 16. axb3 a6 17. Bd4 Nd5 18. Rfd1 Rfd8 19. Bxg7 Kxg7 20. b4 Kg8 21. g3 Nf6 22. Ne5 Rxd1+ 23. Rxd1 Rd8 24. Rxd8+ Qxd8 25. Qc4 e6 26. Qf4 Kg7 27. g4 Qe7 28. Qd4 Kg8 29. c4 Ne8 30. Qc5 Qd8 31. b5 axb5 32. Qxb5 Qd1+ 33. Kg2 Nd6 34. Qc5 b6 35. Qe3 Nxc4 36. Nxc4 Qd5+ 37. Kg1 Qxc4 38. Qxb6 Kg7 39. b4 h5!? { Black had to anticipate White's threat of Qb6-c5, as keeping queens on will leave the b-pawn too powerful since queens are such bad blockaders. After } (39... Qd5 40. Qc5 { Black could survive with } 40... Qxc5 41. bxc5 Kf6 42. f4 e5 43. c6 Ke7 44. fxe5 Kd8 45. Kf2 Kc7 { although such commitments are to be avoided if at all possible. }) 40. Qc5 Qd3 { To understand why Black's 39th move was an error, we have to see why Black can no longer afford to trade queens: } (40... Qxc5?? 41. bxc5 Kf6 42. gxh5 gxh5 43. Kg2 { and the weak h5-pawn will fall, allowing White's h-pawn to promote before Black can return from collecting the c-pawn. }) 41. gxh5 Qxh3 42. Qd4+ f6 43. h6+ Qxh6 44. Qd7+ Kf8 45. b5 Qg5+ 46. Kf1 Qc1+ 47. Kg2 Qg5+ 48. Kf3 Qf5+ 49. Ke3 Qc5+ 50. Kd3 { So far, Black has been defending admirably, but we are about to appreciate how difficult such positions are. } 50... Qb6?? (50... Qb4! { is the clearest draw. First, Black pre-empts Kd3-c4. Then, she prepares to meet } 51. Qc6 { with } 51... Ke7 { as now } 52. b6?? { loses to } 52... Qd6+ 53. Qxd6+ Kxd6 54. Ke4 Kc6 $19) 51. Kc4 { Black is in zugzwang! } 51... g5 (51... e5 52. Kd5 Qxf2 53. Qd6+ Ke8 54. b6 Qf3+ 55. Kc5 Qc3+ 56. Kb5 Qb3+ 57. Kc6 Qc4+ 58. Kb7 Qf7+ 59. Kc8 $18) 52. Qd4 Qa5 53. Qxf6+ Kg8 54. Qg6+ Kf8 55. Qf6+ Kg8 56. Qxe6+ Kg7 57. Qf5 Kh6 58. Qf6+ Kh5 59. b6 Qa4+ 60. Kc5 Qc2+ 61. Kd6 Qd3+ 62. Ke7 Qe4+ 63. Kf8 Kh4 64. f4 { 1-0 White wins. } 1-0