时差问题

Anatoly Yevgenyevich Karpov – Lajos Portisch
Linares, 1989
Queen’s Gambit Declined D31

Notes by Grandmaster Jan Timman, New In Chess, 2008/2, p. 35.

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. cxd5 exd5 5. Bf4 c6 6. e3 Bf5 7. g4 Bg6 8. h4 h5 9. g5 Bd6 10. Nge2 Na6 11. Bxd6 Qxd6 12. Nf4 Nc7 13. Be2 Qb4 14. Qd2 Ne7 15. Bf3 Ne6 16. Nce2 Nxf4 17. Nxf4 Qxd2+ 18. Kxd2 Be4 19. Bxe4 dxe4 20. Rac1 0-0-0 21. Rc5 Nd5 22. Nxd5 Rxd5 23. Rhc1 Rhd8 24. b4 Kc7 25. Ke2 a6 26. f3 exf3+ 27. Kxf3 R5d6 28. Rf5 R8d7 29. Rcc5 Re7 30. Rce5 Kd8 31. a4 g6 32. Rxe7 Kxe7 33. Re5+ Kf8 34. Ke4 f6 35. gxf6 Rxf6 36. b5 axb5 37. axb5 Kf7 38. Rc5 Ke7 39. Rg5 Kf7 40. Rg2 Rf5 41. bxc6 bxc6 42. Rc2 Rf6 43. Ra2 Ke7 44. Ra7+ Kd6 45. Rg7 Ke6 46. Kd3

Here Portisch played 46. ... Kd6? and after 47. e4 he was hopelessy lost.
[Robert James] Fischer indicated that he could have drawn with 46. ... c5!. It is essential to tear down the white pawn structure. It is clear that 47. dxc5 Kd5 won’t yield White anything. The crucial move is 47. Ke4, after which a pawn ending arises by force that is just within drawing territory. Fischer’s main variation went as follows: 46. ... c5 47. Ke4 cxd4 48. exd4 Kd6 49. d5 Kc5 50. Rc7+ Kd6 51. Rc6+ Ke7 52. Rxf6 Kxf6 53. Kf4 Kf7! 54. Ke5 (or 54. Kg5 Kg7 55. d6 Kf7) 54. ... Ke7 55. d6+ Kd7 56. Kd5 g5!, and the black h-pawn will queen with check. An impressive feat of analysis.
47. ... Rf4 48. e5+ Ke6 49. Rxg6+ Kd7 50. Kc4 Rf1 51. Rh6 Rc1+ 52. Kd3 c5 53. d5 c4+ 54. Kd2 Rh1 55. Rh7+ Ke8 56. Rxh5 Rh3 57. Kc2 1 : 0.