Author: Robert Hyatt
Date: 06:59:05 03/27/02
Go up one level in this thread
On March 27, 2002 at 07:18:09, Aaron Tay wrote: >On March 27, 2002 at 06:55:43, James T. Walker wrote: > >>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... >> >>******* >>You can't have it both ways! If the move is correct then a6 means nothing. If >>a6 wins then Nxh2 is definitely wrong. Can you prove that a6 wins? Crafty is >>counting on the Bishop not covering the a8 square I guess. But this could be >>one of the exceptions to the rule if you can prove that a6 wins. The black King >>must head for c7/c8 so it can get to b8 then a8 if the Bishop moves. I suspect >>it all hangs on a tempo. How is the lone King to stop the two connected passed >>pawns without moveing the Bishop? >>******** > >[D]8/B7/4k3/P7/6n1/8/P6P/7K b KQkq - > >Remove black's 2 passed pawns and it still thinks Nxh2 is good with a near draw >score..Eventually (21 seconds on mine,depth 18) crafty 18.13 sees the loss after >Nxh2 but there is nothing better.. > >I guess the rule does have a problem.. > > >Aaron Mine doesn't play Nh2 in the above position. This now becomes a zugzwang position with no black pawns to move, which turns it into a trivial mate for white... > > >>> >>>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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