Author: Albert Silver
Date: 14:31:42 06/09/01
Go up one level in this thread
On June 09, 2001 at 16:49:48, Robert Hyatt wrote:
>On June 09, 2001 at 11:53:32, Dan Andersson wrote:
>
>>It's not that simple. Crafty manages to loose as black against Yace playing at 2
>>min/game to 1 hour/game.
>
>
>Something sounds wrong. Learning files cleared? (should be). Do you have
>tablebases?
>
>I will run a few games here, but if crafty is _losing_ that ending, something
>is wrong. Draws? possibly. But losing seems way off-base...
It's _possible_. Here's a position from some analysis that could occur just to
show the peril. Moves are 1.Rxd6 Kxd6 2.Kb4 Kc6 3.h4 (I find this to be a
tougher defense than 3.c5 though it doesn't save the position) g6 4.g4 f6
(4...f5? 5.h5!) 5.c5 and here Black has exactly one winning move. All the others
either draw or even _lose_.
[D]8/p7/2k2ppp/2P1p3/1K4PP/8/P4P2/8 b - -
I'll post the complete analysis of this position higher in the thread but
basically here is what can happen:
5...a6? 6.Kc4 h5 7.gxh5 gxh5 8.Kd3! only draws.
5...Kd5? 6.Kb5 draws at best, but can even lose. Tablebases would probably help
give a verdict.
5...a5?? 6.Kc4 wins for White!
5...f5?? 6.h5! also wins for White.
and that leaves Black's only winning move AFAIK:
5...h5!
So it is winning, yes, but the path is less than obvious at moments.
Albert
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