E04: Open Catalan: 5 Nf3

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 4. e3 Be7= 4... dxc4 5. Bg2 Bb4+ 6. Bd2 a5 7. Qc2 Bxd2+ 8. Qxd2 c6 9. a4 b5 10. axb5 cxb5 11. Qg5 White threatens to win material: Qg5xb5 11... O-O 12. Qxb5 Ba6 13. Qa4 Qb6 Black threatens to win material: Qb6xb2 14. O-O Qxb2 15. Nbd2 Attacking the isolated pawn on c4. White threatens to win material: Nd2xc4 15... Bb5 16. Nxc4 Bxa4 17. Nxb2 Bb5 Black threatens to win material: Bb5xe2 18. Ne5 Ra7 19. Bf3 19. Nbc4 a4+/= 19... Nbd7 20. Nec4 White threatens to win material: Nc4xa5 20... Rb8 21. Rfb1 g5 22. e3 22. h3 Nd5+/= 22... g4= Black threatens to win material: g4xf3 23. Bd1 Bc6 24. Rc1 24. Rxa5? doesn't work 24... Rxa5 25. Nxa5 Be4-+ Less advisable is 24. Nxa5 Be4 25. Nac4 Rab7-/+ 24... Be4 25. Na4 Rb4 'the rook is the rook!' 26. Nd6 Bf3 27. Bxf3 gxf3 28. Nc8 Ra8 29. Ne7+ Kg7 30. Nc6 Rb3 31. Nc5 White threatens to win material: Nc5xb3 31... Rb5 32. h3 Consolidates g4 32... Nxc5 33. Rxc5 Rb2 34. Rg5+ Increasing the pressure on the isolated pawn on a5 34. Raxa5?? Rxa5 35. Rxa5 Ne4-+ 34. Nxa5?? Ne4 35. Rf1 Nxc5-+ 34. Rcxa5?! is much worse 34... Rxa5 35. Nxa5 Ne4= 34... Kh6 35. Rgxa5 Inferior is 35. Raxa5 Ne4 36. Ne5 Nxg5 37. Rxa8 Nxh3+ 38. Kh2 Nxf2 39. Nxf3 Re2-/+ 35... Rxa5 Black has a mate threat 36. Nxa5 Ne4 37. Rf1 Nd2 38. Rc1 Ne4 39. Rf1 f6 40. Nc6 Nd2 41. Rd1 Ne4 Black threatens to win material: Ne4xf2. The knight feels good on e4 42. Rf1 Twofold repetition 42... Kg6 43. Nd8 White threatens to win material: Nd8xe6 43... Rb6 44. Rc1 h5 45. Ra1 h4 46. gxh4 Kh5 Black threatens to win material: Kh5xh4 47. Ra2 Kxh4 48. Kh2 Kh5 49. Rc2 Kh6 50. Ra2 Kg6 51. Rc2 Kf5 52. Ra2 Rb5 53. Nc6 Rb7 54. Ra5+ Kg6 55. Ra2 Kh5 56. d5 e5 White has a new passed pawn: d5 Worse is 56... exd5 57. Nd4+/- 57. Ra4 White threatens to win material: Ra4xe4 57... f5?? throwing away the advantage >= 57... Nxf2 would be a reprieve 58. Kg3 e4 59. Kxf2 Rb2+ 60. Kf1 Rb1+ 61. Kf2 Rb2+ 62. Kg1 Rb1+ 63. Kf2 Rb2+= 58. Nxe5+- Rb2 59. Nd3 Rb7 60. Rd4 Rb6 61. d6 61. Ne1 Rb1 62. Nxf3 Rb2+- 61... Nxd6 61... Rxd6 62. Rxd6 Nxd6 63. Kg3+- 62. Kg3 Ne4+ 63. Kxf3 Kg5 64. h4+ Kf6 65. Rd5 65. Rxe4 might be the shorter path 65... fxe4+ 66. Kxe4 Rb1+- 65... Nc3 65... Rd6 66. Nf4+- 66. Rd8 Rb1 66... Ke7 67. Rh8+- 67. Rf8+ Ke6 68. Nf4+ Ke5 69. Re8+ Kf6 70. Nh5+ Kg6 71. Ng3 Rb2 72. h5+ Kf7 72... Kh7 doesn't change anything anymore 73. Re7+ Kh8 74. Nxf5+- 73. Re5 73. h6 makes it even easier for White 73... Nd1 74. Ne2 Kg6+- 73... Nd1 74. Ne2 74. Rxf5+!? keeps an even firmer grip 74... Ke6 75. h6 Rxf2+ 76. Ke4 Rc2+- 74... Kf6 75. Rd5 1-0 [Fritz 9 (5s)]