Author: Robin Smith
Date: 20:53:44 01/01/01
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On January 01, 2001 at 23:02:44, Jon Dart wrote: >I've recenty been looking at a couple of endgame positions. The first >one is from a game Arasan played against GM Karen Asrian: > >[D] 8/8/r1B2k2/4p3/4K2p/5N2/8/8 w - - Nxe5 seems to be the best way for white to secure the draw. White must eliminate both of the pawns, even if it means giving up one of his pieces in the process. >The other position is from a game against another program (ChesterX on >ICC): > >[D] 2n5/8/1p6/pK5p/2N2k1P/8/PP6/8 w - h6 > >Here Chester played a4, but the sac Nxb6 seems to be winning. It is not >easy to find. Crafty fails high at ply 17, after almost 5 minutes of search >(on a PIII/733): > > 17 4:53 ++ 48. Nxb6!! > 17 5:20 1.49 48. Nxb6 Nxb6 49. Kxb6 a4 50. Kb5 Kg3 > 51. Kxa4 Kxh4 52. b4 Kg4 53. b5 h4 > 54. Kb4 h3 55. b6 h2 56. b7 h1=Q 57. > b8=Q Qd5 > (2) 17-> 5:24 1.49 48. Nxb6 Nxb6 49. Kxb6 a4 50. Kb5 Kg3 > 51. Kxa4 Kxh4 52. b4 Kg4 53. b5 h4 > 54. Kb4 h3 55. b6 h2 56. b7 h1=Q 57. > b8=Q Qd5 > 18 6:34 1.55 48. Nxb6 Nxb6 49. Kxb6 Kg3 50. Kxa5 > Kxh4 51. b4 Kg4 52. b5 h4 53. b6 h3 > 54. b7 h2 55. b8=Q h1=Q 56. Qc8+ Kf4 > 57. Qc7+ Kf5 58. Qc5+ Ke6 59. Kb5 > 18-> 9:01 1.55 48. Nxb6 Nxb6 49. Kxb6 Kg3 50. Kxa5 > Kxh4 51. b4 Kg4 52. b5 h4 53. b6 h3 > 54. b7 h2 55. b8=Q h1=Q 56. Qc8+ Kf4 > 57. Qc7+ Kf5 58. Qc5+ Ke6 59. Kb5 > 19 11:39 1.55 48. Nxb6 Nxb6 49. Kxb6 Kg3 50. Kxa5 > Kxh4 51. b4 Kg4 52. b5 h4 53. b6 h3 > 54. b7 h2 55. b8=Q h1=Q 56. a4 Qc6 > 57. Qb5 Qc7+ 58. Kb4 Kf3 > >I'd be interested in any analysis or comments on these positions from other >players or programs. The position after Nxb6 is drawn. In the line given above: 48.Nxb6 Nxb6 49.Kxb6 Kg3 50.Kxa5 Kxh4 is a tablebase draw. Robin Smith
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