Author: Oliver Roese
Date: 17:48:51 03/27/02
Go up one level in this thread
On March 27, 2002 at 05:28:28, Jouni Uski wrote: >[D]8/B5pp/4k3/P7/6n1/8/P6P/7K b - - 0 41 > >Crafty as black played Nxh2!!(??). Yes the game ended draw so the move is >probably correct, but I doubt, that Crafty's evaluation really understand this. >E.g. if white plays a6 then black has no way to a8 square... > Good point, this is the key concept to follow: don't let the black king reach his fortress on a8,b8 (Un)fortunately in this particular and seldom position, after 41...Nxh2 the game is still a draw i think, since black has two valuable connected passers. But what if not, e.g without ph7: [D]8/B5p1/4k3/P7/6n1/8/P6P/7K b - - 0 1 Now after 41...Nxh2 42.Kxh2 whites position is won: 42...Kd5 43.a6 Kc6 44.a4! Black can't attack anything, since he has to watch the passer. White will first get the black pawn g7 and then easily outplay the black king to reach b7. Oliver >Crafty 18.14 is clever endgame player, but still I am disappointed, when version >17.14 solves 4 positions more in my 40 position endgame test and also 17.14 >is on average about 30% faster in all postions! > >Jouni > >PS. > >Here's whole game: > >[Event "Computer chess game"] >[Site "USKI"] >[Date "2002.03.26"] >[Round "-"] >[White "Yace 0.99.56"] >[Black "Crafty-18.14"] >[Result "1/2-1/2"] >[TimeControl "60/900"] > >1. d4 c5 2. d5 e5 3. e4 d6 4. Nc3 Be7 5. f4 exf4 6. Bxf4 Nf6 7. Be2 O-O 8. >Nf3 Bg4 9. Nd2 Bc8 10. O-O Na6 11. Bxa6 bxa6 12. Nc4 Rb8 13. Qd3 Nh5 14. >Bd2 Bf6 15. Kh1 Bg4 16. Ne3 Qc8 17. b3 Be5 18. Nc4 Qe8 19. Nxe5 Qxe5 20. >Qxa6 f5 21. Rae1 f4 22. Qd3 Rf6 23. Ne2 Rbf8 24. Rf2 R6f7 25. Ng1 Re8 26. >Nf3 Qf6 27. Bc3 Qg6 28. e5 Qxd3 29. cxd3 Bxf3 30. Rxf3 dxe5 31. d6 Rd7 32. >Rxe5 Rxe5 33. Bxe5 Kf7 34. g4 Ke6 35. d4 cxd4 36. Bxd4 Rxd6 37. Bxa7 Nf6 >38. Rxf4 Ra6 39. Ra4 Rxa4 40. bxa4 Nxg4 41. a5 Nxh2 42. Kxh2 Kd5 43. a6 Kc6 >44. a4 g5 45. Kg3 Kc7 46. Kg4 h6 47. Kf5 Kc8 48. a5 Kc7 49. Kg4 Kc8 50. Kh5 >Kc7 51. Kxh6 g4 52. Kg5 g3 53. Kh5 g2 54. Kg6 Kd7 55. Kg5 Kc8 56. Bg1 Kb8 >57. Kf4 Ka8 58. Kf3 Kb8 59. a7+ Kb7 60. a8=Q+ Kxa8 1/2-1/2
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