Author: Andrew Williams
Date: 03:49:03 10/22/01
Go up one level in this thread
On October 21, 2001 at 18:22:26, Jon Dart wrote:
>Recently Arasan had this position against Postmodernist:
>
>[D] 8/6P1/2B2n2/p4P2/P2k4/1pp5/1K6/8 w - -
>
>White played Kc1 and lost after ... c2 64. Kd2 Kc4 65. Bb5+ Kb4 66. Bd3 Kxa4
>67. Bc4 Ka3 68. Kc1.
>
>I think White is dead after Kc1 and has to play Kxb3 here. But it seems to be
>extraordinarily difficult for a number of programs, including mine, to see that
>this is bad.
PM was expecting Kxb3 and would have replied Kd3, with a score of +1.41
>
>Even at this point:
>
>[D] 8/6P1/2B2n2/p4P2/P1k5/1p6/2pK4/8 w - -
>
>Crafty keeps predicting a draw, with the pv Bb5+ Kb4 Bd3 Ng8 Kc1 Kc5 Bb5 Kd4 Kd2
>Nf6 Bc6. Arasan's score goes - after about ply 12 but it doesn't see disaster.
>Hiarcs, however, seems to figure this out pretty fast.
>
>--Jon
I've tried this position on my PIII-450 at work. The AMD 1200 at home is
approximately 4 times faster. PM's score is never positive for this second
position. The score is down at -2.07 after ply 14. The PV is:
14= -207 115s 5927918 1.Bb5 Kb4 2.Bd3 Kxa4 3.Kc1 Kb4 4.Bxc2 bxc2
5.Kxc2 a4 6.Kb1 Ng8
In the game, after Bb5 PM got down to depth 16:
16= 165 16s 4167280 65...Kb4 66.Bd3 Kxa4 67.Bc4 Ka3 68.Kc1 a4
69.g8=Q Nxg8 70.Bxg8 Ka2 71.f6 Ka1
In both cases, the PVs are incomplete.
Regards
Andrew
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