Author: Uri Blass
Date: 08:44:21 09/18/01
Go up one level in this thread
On September 18, 2001 at 10:31:10, Robert Hyatt 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. >> >>:-( >> >>S532 finds the move with TBs after 58 seconds on P600: >> >>Analysis by Shredder 5.32: >> >> >>1.Df6+ Kh7 2.Dxa6 De1+ 3.Kg4 Dg1+ 4.Kf4 Dh2+ 5.Ke4 Dg2+ 6.Kd4 Dxg5 7.Db7+ Kh8 >> +- (2.33) Tiefe: 11/22 00:00:44 7096kN, tb=6535 >>1.Dd7+ Kg8 2.De6+ Kh7 3.Dxa6 De1+ 4.Kg4 Dg1+ 5.Kf4 Dh2+ 6.Ke4 Dg2+ 7.Kd4 Dxg5 >>8.Db7+ Kh8 >> +- (2.34) Tiefe: 11/22 00:00:46 7474kN, tb=6990 >>1.Dd7+ Kg8 2.De6+ Kh7 3.Dxa6 De1+ 4.Kg4 Dg1+ 5.Kf4 Dh2+ 6.Ke4 Dg2+ 7.Kd4 Dxg5 >>8.Db7+ Kh8 >> +- (2.34) Tiefe: 11/22 00:00:52 8440kN, tb=7665 >>1.Dd4+ Dxd4 2.exd4 Kf7 3.Kf4 Ke6 4.Ke4 Kf7 >> +- (2.35) Tiefe: 11/22 00:00:58 9490kN, tb=8444 >>1.Dd4+ Dxd4 2.exd4 Kf7 3.Kf4 Ke6 4.Ke4 a5 5.d5+ Kd7 6.Ke5 Ke7 7.d6+ >> +- (2.66) Tiefe: 11/22 00:00:58 9494kN, tb=8444 >> >> >>For Tiger 14 is this not so easy: >> >>Analysis by Chess Tiger 14.0: >> >>1.Df6+ Kh7 2.Dxa6 De1+ 3.Kg2 Dxe3 4.Db7+ Kg8 5.Dc8+ Kf7 6.Dd7+ Kg8 7.Dd5+ Kg7 >>8.a5 De2+ 9.Kg3 De1+ >> +- (2.28) Tiefe: 15 00:03:00 37784kN, tb=595 >>1.Dd4+ Dxd4 2.exd4 Kf7 3.d5 Ke7 4.Kf4 Kd6 5.Ke4 a5 6.Kd4 Ke7 7.Ke5 Kf7 8.d6 Ke8 >>9.Kf6 >> +- (2.36) Tiefe: 15 00:03:31 44143kN, tb=712 >>1.Dd4+ >> +- (3.26) Tiefe: 16 00:03:52 48366kN, tb=955 >> >>Eduard > > >This is more about specific knowledge than speed. On a 600mhz laptop, I get >this: > > (2) 11 12.57 1.86 1. Qf6+ Kh7 2. Qxa6 Qe1+ 3. Kg2 Qxe3 > 4. Qb7+ Kh8 5. Qb8+ Kg7 6. Qc7+ Kg8 > 7. Qc8+ Kf7 8. Qd7+ Kg8 9. Qd5+ Kg7 > 10. a5 > 11 19.60 1.99 1. Qd4+ Qxd4 2. exd4 Kf7 3. d5 Ke7 > 4. Kf4 Kd6 5. Ke4 a5 6. Kd4 Kd7 7. > Ke5 > (4) 11-> 19.62 1.99 1. Qd4+ Qxd4 2. exd4 Kf7 3. d5 Ke7 > 4. Kf4 Kd6 5. Ke4 a5 6. Kd4 Kd7 7. > Ke5 > (3) 12 19.64 2.05 1. Qd4+ Qxd4 2. exd4 Kf7 3. Kf4 Ke6 > 4. Ke4 Kd6 5. a5 Ke6 6. d5+ Kd6 7. > Kd4 Kd7 8. Ke5 > > >etc... It may be about search rules and not only about evaluation. I know that programs have often problem in the transition to pawn endgames. If you give them the position after 1.Qd4+ Qxd4 2.exd4 they are going to see that white wins with no problem but if you give them the root position they are going to see nothing and the reason is simply bad search rules. If the remaining depth after 1.Qd4+ Qxd4 2.exd4 is x plies by normal rules then it should be bigger than x for example x*3/2 because the position after 2.exd4 is the starting position of a pawn endgame. I do not know if 3/2 is the best number and it is possible to try other functions of x but basically they should search pawn endgame deeper because the time that they need to get the same depth is smaller. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.