Author: Kai Skibbe
Date: 09:23:37 05/12/98
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On May 12, 1998 at 07:05:53, Howard Exner wrote: >On May 12, 1998 at 01:17:08, Kai Skibbe wrote: > >>The following position is from a game between >>Rebel 9.0 28 MB HT and Fritz 5.03 64MB HT on >>a PC with a AMD K6-200. >> >>WKh3, Rh6, Pg3,g2 >>BKc5, Rb6, Ph7 >>White to move >> >>Rebel 9.0 as white was unable to find the winning >>exchange Rxb6 in 5 minutes. He played Rxh7 and after >>some moves the game became a draw. >>I have tested the same position with Shredder 2.0 64MB >>and Genius 5.0 32 MB. Both programs didn´t see the winning >>exchange in 10 minutes and played the same move as >>Rebel (Rxh7). >>I´m not sure if the game could be a win for white after >>Rxh7, but after Rxb6 the win should be clear. >> >>Does any chessprogram play the move Rxb6 and see the win ? >>The evaluation should be at least 4 pawn, if the program >>has understood the position. >> >>Why is this position so difficult for programs ? > >Both moves, Rxb6 and Rxh7 will win. In the Rxh7 line the >black king is too far away and will be cut off by white's >Rook (Rd7). > >Could you post the remainder of the game ? I'd like to see >how Fritz managed to draw this. I've seen Rebel routinely >win these kinds of positions when the king is cut off. Here is the rest of the game after the position Rebel 9.0 28MB - Fritz 5.03 64MB 59. Rxh7 Kd5 60. g4 Ke5 61. g5 Kf5 62. Kh4 Rb1 63. Rf7+ Kg6 64. Rf6+ Kg7 65. Rd6 Rh1+ 66. Kg3 Rg1 67. Rb6 Kf7 68. Kf3 Rc1 69. Kg4 Rd1 70. Rc6 Kg7 71. Ra6 Rc1 72. g3 Rf1 73. Ra7+ Kg6 74. Ra4 Rd1 75. Ra6+ Rg7 At this point I stopped the game. IMO there is no win for white. I have tested the position after 59. Rxb6 Kxb6. From this position all programs play the correct moves ( 60. Kg4 or g4 ). BTW CM 5500 and CM5555 find the move Rxb6 instantly, but the evaluation is only about +1.8 pawns. So they both have not seen a promoted pawn.
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