Author: Mike S.
Date: 13:52:49 02/13/02
Go up one level in this thread
On February 13, 2002 at 16:19:21, James T. Walker wrote: >On February 13, 2002 at 15:38:58, Kurt Utzinger wrote: > >>Black to move. The position is a draw, even if White could manage to win both >>Black pawns. But quite a lot of [top] programs do not at all understand this >>and show completely wrong evaluations. (...) >>[D] 8/8/5k1p/6pP/6K1/8/8/3B4 b - - 0 1 >I believe that playing the position properly (saving the draw) is more >important than the eval shown by the program. (...) What, if you imagine that the position above has not been reached in the game yet, but somewhere up in the search tree (i.e. after some exchanges)? If White's eval shows an advantage, he might allow Black a "tricky" draw. IOW, if a program doesn't have good knowledge of the blind bishop motif, there will be situations he looses 0.5 points because of that. The opponent can sac something to reach a blind bishop draw, the program fails to refute the sac, for example. The following is not an optimal example, but here I could draw against Fritz 4 just because of that, by playing 44...h5 45.gxh5 Nxf4. To keep winning chances, white must not play gxh5. I don't think I would have had a chance to draw that position without that trick (being below 2000 elo): [D]8/5pk1/5pnp/8/4BPP1/4K2P/8/8 b - f3 0 44 44...h5 45.gxh5(?) Nxf4 draw The game was starting from a training position, from an old master game. I forgot which year, IIRC 1995. [Event "P133 0:15 per move"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "Fritz 4.01"] [Black "Scheidl, M."] [Result "1/2-1/2"] [SetUp "1"] [FEN "1r1r2k1/4np1p/5p2/pp1Pb3/8/P4B1P/2N2PP1/1R1R2K1 b - - 0 24"] 24... Bc3 25. d6 Nf5 26. d7 b4 27. axb4 axb4 28. Rb3 Nh4 29. Bc6 Ng6 30. Rdb1 Ne5 31. Be4 Nxd7 32. Nxb4 Bxb4 33. Rxb4 Rxb4 34. Rxb4 Nc5 35. Bf5 Rd1+ 36. Kh2 Rd2 37. Kg3 h6 38. Kf3 Kg7 39. g4 Nd3 40. Ke3 Nxb4 41. Kxd2 Nc6 42. Ke3 Ne7 43. Be4 Ng6 44. f4 h5 45. gxh5 Nxf4 46. Kxf4 Kh8 47. h6 Kg8 48. h4 Kh8 49. h5 Kg8 50. Kf5 Kh8 51. Kxf6 Kg8 52. Bf3 Kh8 53. Be2 Kg8 54. Bd1 Kh8 55. Kxf7 Kh7 56. Bf3 Kh8 57. Kg6 1/2-1/2 Regards, M.Scheidl
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