Author: Uri Blass
Date: 14:25:12 09/18/01
Go up one level in this thread
On September 18, 2001 at 12:25:18, José Carlos wrote: >On September 18, 2001 at 10:53:39, Uri Blass wrote: > >>On September 18, 2001 at 10:45:15, José Carlos wrote: >> >>>On September 18, 2001 at 09:56:32, Ed Schröder wrote: >>> >>>>On September 18, 2001 at 09:40:26, Eduard Nemeth wrote: >>>> >>>>>First the game: >>>>> >>>>>[Event "TCh-YUG Herceg Novi YUG"] >>>>>[Site "?"] >>>>>[Date "2001.??.??"] >>>>>[Round "?"] >>>>>[White "Vukic,M"] >>>>>[Black "Marinkovic,I"] >>>>>[WhiteElo "2470"] >>>>>[BlackElo "2440"] >>>>>[ECO "A30"] >>>>>[Result "1-0"] >>>>> >>>>>1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O g6 5. c4 c5 6. Nc3 >>>>>Bg7 7. d4 cxd4 8. Qxd4 d6 9. Be3 Nbd7 10. Rac1 Rc8 11. b3 >>>>>O-O 12. Qd2 Nc5 13. Rfd1 Nce4 14. Nxe4 Nxe4 15. Qe1 Qd7 >>>>>16. Nd4 Nf6 17. Nf3 Ne4 18. Qb4 Nc3 19. Rd2 Ne4 20. Rd3 Nc5 >>>>>21. Rdd1 Rfd8 22. Ne1 h5 23. Bxc5 Rxc5 24. Nd3 Bxg2 >>>>>25. Kxg2 Qb7+ 26. f3 Rc7 27. Nf2 Rdc8 28. Qd2 b5 29. cxb5 >>>>>Qxb5 30. Kf1 Bc3 31. Qd3 Qa5 32. Rc2 Bf6 33. Rdc1 Rxc2 >>>>>34. Rxc2 Rxc2 35. Qxc2 d5 36. e3 Kg7 37. Nd3 e6 38. Ke2 Qa3 >>>>>39. f4 Kg8 40. h3 Kg7 41. Kf3 Qd6 42. g4 hxg4+ 43. hxg4 e5 >>>>>44. fxe5 Bxe5 45. Nxe5 Qxe5 46. Qc5 Qf6+ 47. Kg3 Qe5+ >>>>>48. Kh3 a6 49. Qd4 Kf6 50. b4 Ke6 51. a4 Qc7 52. g5 Qc2 >>>>>53. Qf6+ Kd7 54. Qxf7+ Kd6 55. Qf6+ Kd7 56. Qd4 Ke6 57. Kg3 >>>>>Qb1 58. Qb6+ Ke7 59. Qb7+ Kf8 60. Qxd5 Qxb4 61. Qd8+ Kg7 >>>>>62. Qd4+ 1-0 >>>>> >>>>>Position after move 61. Kg7: >>>>> >>>>>[D]3Q4/6k1/p5p1/6P1/Pq6/4P1K1/8/8 w - - >>>>> >>>>>After 62. Qf6+ is the win not easy. But after 62. Qd4+ is the game easy to win, >>>>>and the game end! For any programs ist the move Qd4+ not easy to find. >>>>> >>>>>:-( >>>> >>>> >>>>I am sure all Rebel programs find this instantly. A simple chess rule says: >>>>"one pawn up in a pawn ending wins". >>>> >>>>Ed >>> >>> Are you serious Ed? In this position, it's a clear win, but in most pawn >>>endgames, you have to calculate a lot, or otherwise know some rules (which names >>>I don't know how to translate from spanish to english) to figure if it's a win >>>or not. >>> >>> Maybe you were simply joking, and I didn't catch it... :) >> >>In most pawn endgames one pawn advantage is enough to win the game. >>It is not something that always happens but computer can safely evaluate >>+2 for positions with one pawn advnatage if they do not see a positional >>advantage for the side that has less pawns. >> >>Uri > > In many, but not in most. As a average chess player (2135 FIDE) I _never_ >consider a pawn ending with a pawn up as won unless I see how to win it: get a >passer, control opponent's passer/s, get the correct kings position (count >tempos, etc). I'm not very strong, but I think I'm right here. Just remember >Reti's studies 2 vs 1 pawns... how difficult they are! > > José C. I agree that 2 vs 1 are unclear in a lot of cases but there are tablebases for these positions and the interesting positions are when there are more pawns in the board and in most of the cases they are won positions. It does not mean that I can be sure that they are winning without calculating. In most of the cases does not mean in 100% of the cases. Uri
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