[Event "St Petersburg International Preliminary"] [Site "St Petersburg"] [Date "1914.05.03"] [Round "9"] [White "Alekhine, Alexander"] [Black "Bernstein, Ossip Samuel"] [Result "1/2-1/2"] [ECO "C66"] [Annotator "Tactical Analysis 4.1 (180s)"] [PlyCount "72"] [EventDate "1914.04.21"] [EventType "tourn"] [EventRounds "11"] [EventCountry "RUS"] [SourceTitle "Tarrasch"] [Source "ChessBase"] [SourceDate "2018.10.02"] [SourceVersion "1"] [SourceVersionDate "2018.10.02"] [SourceQuality "1"] {Analizada por Fat Fritz 2.0.} 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bxc6 Bxc6 8. Qd3 exd4 9. Nxd4 O-O {C66: Ruy Lopez: Steinitz Defence.} 10. Bg5 $146 ({Predecessor:} 10. b3 Nd7 11. Bb2 Bf6 12. Nxc6 bxc6 13. Rad1 Qe8 14. Rfe1 Ne5 15. Qa6 Qc8 16. Qa5 Ng6 17. Na4 Bxb2 18. Nxb2 Re8 19. Nd3 c5 20. Re3 Qb7 21. Rde1 Re7 22. Qa4 Rae8 23. e5 h6 24. f4 Kh7 25. g3 Qd5 26. Qe4 Qxe4 27. Rxe4 f6 28. Ra4 fxe5 29. f5 Nh8 30. Rxa7 Nf7 31. Ra4 e4 32. Nf4 Ng5 33. Kg2 Nf3 34. Rc1 Nd4 35. Ng6 Rf7 36. g4 e3 37. c3 Nc6 38. Re1 Rd7 39. Kf3 Ne5+ 40. Nxe5 Rxe5 41. Rxe3 Rxe3+ 42. Kxe3 c6 43. Ra6 Rc7 44. Rb6 Kg8 45. a4 Kf7 46. a5 Ke7 47. h4 Kf6 48. Kf4 g5+ 49. fxg6 Kxg6 50. a6 Kf6 51. Rb7 Rc8 52. a7 Ra8 53. Rh7 Rf8 54. Ke3 Ke5 55. Rxh6 Ra8 56. Rh5+ Ke6 57. Rh7 d5 58. Rc7 Ke5 59. Re7+ Kd6 60. Rg7 Ke5 61. h5 d4+ 62. Kd3 Rf8 63. Rf7 Rxf7 64. a8=Q Rf3+ 65. Kd2 Rxc3 66. Qa5 {1-0 (66) Leonhardt,P-Salwe,G, DSB Kongress - 17Meisterturnier Hamburg (11) 1910}) 10... Nd7 11. Bxe7 Qxe7 {White is slightly better.} 12. Rae1 Rfe8 13. f4 Nc5 14. Qc4 Qd7 (14... Bxe4 $2 15. b4 $18) (14... a5 $11) 15. e5 (15. b4 $1 $14 Ne6 16. Nb3) 15... Rad8 16. Rd1 Ne6 17. Nf5 Nf8 18. Qd3 {[%CAl Re5d6]} g6 ({Of course not} 18... dxe5 $6 19. Nh6+ $1 {[%mdl 512]} gxh6 20. Qg3+ Ng6 21. Rxd7 $16) 19. Nh6+ Kg7 {[#]} 20. f5 $1 Rxe5 $11 (20... Kxh6 21. Qh3+ Kg7 22. f6+ Kh8 23. Qh6 $18) 21. Ng4 Rxf5 22. Qd4+ f6 $1 23. Nxf6 Ne6 24. Qh4 Qf7 25. Rxf5 $40 {[%mdl 128] White mounts an attack.} gxf5 26. Ncd5 Bxd5 27. Nxd5 Kh8 (27... Re8 {with more complications.} 28. Qb4 Nc5 29. Qc3+ Re5 30. b4 Kg8) 28. Re1 {Nxc7! is the strong threat.} Rf8 29. Qh3 c6 (29... Ng7 $11 30. Qb3 c6) 30. Qc3+ $14 Kg8 31. Qg3+ {[%mdl 64] Double Attack} Ng7 (31... Qg7 $142) 32. Ne7+ $16 Kh8 33. Qxd6 Re8 (33... Qf6 $16 34. Qxf6 Rxf6) 34. Kf2 (34. b3 $18) 34... Qc4 {[#]} (34... Qxa2 $2 35. Qf6 $18) (34... a5 $142) 35. Kg1 (35. Re2 $16 {y un enfrentamiento entre módulos punteros así lo demuestra:} Ra8 36. b3 Qf7 37. Qc7 Re8 38. Qd6 a6 39. a4 Ra8 40. a5 Qh5 41. h3 Qg5 42. Re3 Re8 43. Qe5 h6 44. Qd6 Kh7 45. g3 Qh5 46. h4 Qf7 47. Ke2 Ra8 48. Re5 Rf8 49. g4 Ne8 (49... fxg4 $2 50. Qd3+ Kh8 51. Ng6+ $18) 50. Qd4 fxg4 51. Qe4+ Kg7 52. Qxg4+ Kh7 53. Qe4+ Kg7 54. Qg4+ Kh7 55. Qe4+ Kg7 56. Nf5+ $1 Kh8 57. Qf4 Qf6 58. Qxh6+ Qxh6 59. Nxh6 {[#] con ventaja de material sin compensación.} Kg7 60. Ng4 Rf4 61. Rxe8 Rxg4 62. Re7+ Kf6 63. Rxb7 $18 {[#]} Ke6 64. Rh7 Rf4 65. Rh5 Rb4 66. Kf2 Kd6 67. Kg3 Re4 68. Rg5 Ke7 69. h5 Kf7 70. Rc5 Re6 71. Kf4 Rd6 72. c3 Kg7 73. b4 Kh7 74. Ke4 Rf6 75. Rg5 Rf8 76. Rg6 Rc8 77. Kd4 Rd8+ 78. Kc4 c5 79. bxc5 {[#] 1-0 (88) - 40 jugadas en 1 hora sin finish - Fat Fritz 2-Dragon by Komodo Chess 64-bit Tenerife 2021}) 35... Qf7 ({Don't blunder} 35... Qxa2 $2 36. Qf6 $18) ({Black should try} 35... Qxc2 $14 36. Qd4 f4) 36. Kf2 Qc4 {[#] Y tablas por mutuo acuerdo. Con 37.Te2 se traspone a la línea señalada en la 35ª jugada.} ({Wrong is} 36... Qxa2 $2 37. Qf6) 1/2-1/2