Mundial femenino P7: se acaba el margen

[Event "Women's World Champonship"] [Site "?"] [Date "2016.03.11"] [Round "7"] [White "Hou , Yifan"] [Black "Muzychuk, Mariya"] [Result "1/2-1/2"] [ECO "C83"] [WhiteElo "2667"] [BlackElo "2563"] [Annotator "Adrian Mikhalchishin"] [PlyCount "161"] [EventDate "2016.03.11"] [SourceDate "2016.03.11"] 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2 Be7 10. c3 Nc5 11. Bc2 d4 12. cxd4 (12. Nb3 {This position has become popular among the fans of the Open Spanish recently. White can move into a slightly better ending, which happened in the game, but doesn't really have any real winning chances.} d3 13. Nxc5 ({The bishop retreat led to sharper positions:} 13. Bb1 Nxb3 14. axb3 Bf5 15. b4 O-O 16. Re1 Qd5 (16... Bg6 {is very tempting:} 17. h3 a5 18. bxa5 Rxa5 19. Rxa5 Nxa5 20. e6 fxe6 21. Rxe6 c5 22. Qe1 Bf6 23. Bf4 c4 24. Bd6 Bf7 {with good counterplay, Shirov,A (2722) -L'Ami,E (2628)/Wijk aan Zee NED 2011}) (16... Qd7 17. h3 Bg6 18. Ba2 Kh8 19. Bf4 a5 20. bxa5 Rxa5 21. b4 Ra4 22. Bb3 Rxa1 23. Qxa1 Nd8 24. Qa7 Ne6 25. Bd2 Rd8 $11 {Shirov,A (2723)-Caruana,F (2675)/Wijk aan Zee NED 2010}) 17. h3 Rfd8 18. g4 Be6 19. Re3 {Karjakin,S (2723)-Mamedyarov,S (2719)/Khanty-Mansiysk RUS 2009. (34)}) 13... dxc2 14. Qxd8+ Rxd8 15. Nxe6 fxe6 16. Be3 Rd5 17. c4 bxc4 18. Rac1 Nb4 ({Worse is} 18... Nxe5 19. Nxe5 Rxe5 20. Rxc2 Rb5 21. Rxc4 Rxb2 22. Rxc7 Kf7 23. g4 Re8 24. Rd1 Kg6 25. a4 Rb4 26. Rd4 a5 27. Rxb4 Bxb4 28. Kg2 Rd8 29. h4 {Svidler,P (2693)-Kaidanov,G (2629)/Moscow RUS 2003. Black has to try to hold a difficult endgame.}) 19. a3 Nd3 20. Rxc2 Kd7 21. Bd4 (21. Bc1 { was simpler.}) 21... Rb8 22. Bc3 c5 $6 ({A more principled move was to improve the position of the bishop:} 22... Bc5) 23. Nd2 {with a better endgame, Hou,Y (2578)-Koneru,H (2600)/Tirana 2011}) 12... Nxd4 13. Nxd4 Qxd4 14. Nf3 Qxd1 15. Rxd1 O-O {[#]} 16. Be3 ({Other tries are possible} 16. Nd4 Rfd8 17. b4 Na4 18. Nc6 Rxd1+ 19. Bxd1 Bf8 20. Bf3 Re8 21. a3 Nb6 22. g3 h6 23. h4 g6 24. Bg2 Bg7 25. f4 f6 26. Bb2 fxe5 27. Bxe5 Nc4 28. Bxg7 Kxg7 29. a4 bxa4 30. Rxa4 { with some chances, Hou,Y (2578)-Koneru,H (2600)/Tirana 2011}) ({Black was able to hold the draw easily after} 16. Ng5 h6 17. Bh7+ Kh8 18. Nxe6 Nxe6 19. Be4 Rad8 20. Be3 Bg5 21. Bxg5 hxg5 22. Kf1 g6 {1/2 Efimenko,Z (2703)-Caruana,F (2712)/Poikovsky RUS 2011}) ({But worth trying is} 16. Bg5) 16... Rfd8 17. Rdc1 h6 18. Nd4 Bd5 19. Bd1 {This was Hou's prepared novelty.} ({She has also tried } 19. f4 Ne6 20. Nxe6 fxe6 21. Bg6 Rac8 22. Bc5 Kf8 23. Bxe7+ Kxe7 24. Rc5 Bc4 25. b3 Bd3 26. Bxd3 Rxd3 27. Rac1 Kd7 {Black has to overcome some small problems here, Hou-Koneru,Tirana,2012}) ({The more active} 19. Nf5 {didn't promise more.} Bf8 20. Bxc5 Bxc5 21. Bd1 Bf8 22. Rxc7 Be6 23. Ne3 Rd2 24. Bc2 Rad8 25. h4 Re2 {Black has very comfortable play. Robson,R (2465)-Kaidanov,G (2595)/Saint Louis 2009}) 19... Nd3 20. Rxc7 {[#]} Bf8 {Muzychuk spent 45 minutes here!} ({There were a few serious options such as} 20... Bg5 21. Bxg5 hxg5 22. e6 fxe6 23. Nc6 Rd6 24. Ne7+ Kf8 25. Ng6+ Kg8 26. Bc2 {with a slight advantage,}) ({but best was} 20... Bc5) 21. e6 fxe6 22. Bg4 Re8 23. b3 Bd6 { It is necessary to kick out this Rook from the seventh rank.} 24. Rc2 Ne5 25. Be2 ({It was possible to handle it a bit more precisely with} 25. Bh5 Rec8 26. Rac1 Rxc2 27. Rxc2 g6 28. Be2 h5) 25... Be4 ({White stays a bit better thanks to the small weakness of the e6 pawn. Black has to play carefully.} 25... Rec8 26. Rac1 Rxc2 27. Rxc2 Kf7 28. f4 Nd7) 26. Rd2 Bb4 27. Rdd1 Bd5 28. Rac1 Rac8 { [#]} 29. h4 ({In the commentators rooms we evaluated} 29. f4 {as more dynamic} Nd7 30. a4) 29... Ba3 $1 {Now Black starts to fight for the c-file.} 30. Rc2 Rxc2 31. Nxc2 Be7 32. h5 Rc8 33. Nd4 Kf7 ({It was better to do a bit differently} 33... Nd7 34. f3 Nf6 35. g4 Kf7) 34. f3 Bf6 ({Very good was} 34... Rc3 35. Bd2 Rc8) 35. Kf2 Rc3 ({Or} 35... Bh4+ 36. g3 Bf6) 36. f4 Nd7 ({Worse was} 36... Nc6 37. Nxc6 Bxc6 38. Bd3) 37. Bd3 Ke7 38. Bb1 {[#]} Bh4+ ({Also possible was} 38... Kf7 {as a waiting strategy}) 39. Ke2 Bf6 {[#]} 40. g4 $2 ({ Black would face some real problems after} 40. Nf5+ $1 Kf7 41. Bd2 Rc7 42. Ne3) 40... Bxd4 $1 {A very brave decision by Mariya! It is not easy to give up such a bishop.} 41. Bxd4 ({Compensation for the pawn was clear after} 41. Rxd4 Nf6 42. g5 hxg5 43. fxg5 Nxh5 44. Kd2 Rc6 45. Bd3) 41... Rh3 $1 (41... Bf3+ { would be a difficult fight for the draw.} 42. Kd2 Bxd1 43. Kxc3 Bxg4 44. Bxg7 Bxh5 45. Bxh6 Nb6 46. Be4 Nd5+ 47. Kd4) 42. Rc1 $6 ({Hou Yifan wants to show activity,but better was defensive strategy} 42. Rg1) 42... Bf3+ 43. Kf2 {[#]} Bxg4 ({White would have some serious problems after} 43... Nf6 44. Bxf6+ (44. Rc7+ Kd8 45. Rxg7 Nxg4+ 46. Kf1 Rh2) 44... Kxf6 45. Rg1 Bd5 46. g5+ Ke7 47. gxh6 gxh6 48. Rg7+ Kd6 49. Ra7 Rxh5 50. Rxa6+ Kc5) 44. Bxg7 Rxh5 45. Kg3 Bf5 46. Bxf5 Rxf5 (46... exf5 47. Rc6) 47. Bxh6 Rc5 $1 48. Rf1 ({White could make draw now in a slightly worse position with} 48. Rxc5 Nxc5 49. Kg4 Nd3 50. f5 Nb4 51. a4) 48... Nf6 (48... Rc3+ $5) 49. Bg5 Kf7 {Rook endgame is the best draw solution} 50. Bxf6 Kxf6 {[#]} 51. b4 ({Passive defence was better} 51. Rf2 Kf5 52. Re2 Rc3+ 53. Kf2) 51... Rc4 52. Rf3 Kf5 $1 {Now it becomes clear that Black will win a pawn} 53. Ra3 Rxf4 54. Rxa6 Rxb4 55. Rb6 Ke5 56. Kf3 Kd5 57. Ke3 e5 58. Kd2 {[#]} Rb2+ $2 ({Black could keep winning chances after} 58... Kc4 59. Rc6+ Kd4 60. Rd6+ Ke4 61. Rb6 Kf3) 59. Kc1 Rb4 ({It was not so difficult way to draw after} 59... Kc5 60. Re6 Re2 61. Kd1 Re4 62. a3 Re3 63. Kd2 Kd4 64. Rd6+ Ke4 65. Rb6 Rd3+ 66. Ke2 Rb3 67. Kd2 Kf4 68. Rf6+ Kg4 69. Re6 Kf5 70. Rb6) 60. a3 $1 {Very precise move.} Kc5 61. Re6 Re4 ({It was necessary to try} 61... Rc4+ 62. Kb2 Kd4) 62. Kc2 Kd4 63. Rd6+ Kc4 ({The last try to play for a win was} 63... Ke3 64. Rd5 Rc4+ 65. Kb3 e4 66. Rxb5 Kd4) 64. Rc6+ Kd5 65. Rb6 Rc4+ 66. Kd2 Kc5 {[#]} 67. Rb8 Ra4 68. Rc8+ Kd4 69. Rb8 Ra5 70. Rd8+ Kc4 71. Re8 Kd4 72. Rd8+ Ke4 73. Rb8 Rxa3 74. Rxb5 {Now we have a very well-known Philidor draw position.} Kf4 75. Rb8 Kf3 76. Rf8+ Ke4 77. Rb8 Ra2+ 78. Ke1 Kf4 79. Rb3 e4 80. Rc3 e3 81. Rc8 1/2-1/2