Author: Uri Blass
Date: 06:13:18 09/08/01
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On September 07, 2001 at 23:10:53, Peter McKenzie wrote: >On September 07, 2001 at 22:08:27, Odd Gunnar Malin wrote: > >> >>I don't have his position but I have another 'quadrat position' like the Fine 70 >>with a not so obvious first move, well it is Kb1 but that must be a coincidence >>:) >> >>[D]2k5/2p2p2/2p1p3/2P1PpP1/1p1P1p2/1P3P2/1K3P2/8 w - - 0 1 >>White wins. 1.Kb1! > >Are you sure? >I ran it through LambChop, and the prefered move was switching between Kb1 and >Kc2 with a score of around 0.4 for each move. Then at depth 25 I got a fail >high on Kc2, returning a score of 1.6. > >As I write, the same score has popped up for Kc2 at depth 26 too... > >Peter Lambchop simply does not search deep enough. You need to let it search at least into depth 32. Note that Deep Fritz that is not installed on the p200 can see +4.53 for white at depth 34 and +4.56 for white for Kb1 at depth 36 and only +2.06 for white at depth 34 if I give it to analyze the position after Kc2 Kb7 Kb1 simply wins without complications when Kc2 may win but it is more hard to find the win. The idea is Kb1 Kb7 Kc2 Ka7(forced not to lose b4) Kd2 Kb7(forced not to lose b4) Ke2 Ka7(forced not to lose b4) Kf1 Kb7 Kg2 Kc8 Kh3 Kd7 Kh4 Ke8 Kh5 Kf8 and white can play g6 without sacrificing the pawn. Another possible line is 1.Kb1 Kb8 2.Kc1 Ka8 (Kb7 3.Kc2 or Ka7 3.Kd2 transpose to the previous line) 3.Kd1 Kb8(Kb7 4.Ke2 or Ka7 4.Kd2 transpose to the previous line) 4.Ke1 Kc8 5.Kd2 Kb7 6.Ke2 Ka7 7.Kf1 I did not give all the possibilities but you can analyze and understand that they are losing by similiar ideas. Here is some analysis by Crafty18.07 on p200 I asked chessbase to show only new moves New position 2k5/2p2p2/2p1p3/2P1PpP1/1p1P1p2/1P3P2/1K3P2/8 w - - 0 1 Analysis by Crafty 18.07: 1.Kc2 Kb7 2.Kd3 Ka6 3.Kd2 Ka7 4.Ke2 Kb7 5.Ke1 Ka8 6.Kd1 Kb8 7.Kc1 Ka8 8.Kc2 Kb7 = (0.06) Depth: 1/3 00:00:02 = (0.00) Depth: 23/32 00:00:27 1712kN 1.Kb1 Kb7 2.Kc2 Ka6 3.Kd3 Kb5 4.Ke2 Ka5 5.Kf1 Kb5 6.Kg2 Ka5 7.Kh3 Ka6 8.Kh4 Kb7 9.Kh5 Kc8 10.g6 fxg6+ 11.Kxg6 Kd8 12.Kf6 Kd7 13.Kf7 Kd8 14.Kxe6 ² (0.40) Depth: 23/32 00:00:30 1935kN +- (6.02) Depth: 32/56 00:34:17 156131kN, tb=37 Uri
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