Author: Dieter Buerssner
Date: 01:03:00 06/13/01
Go up one level in this thread
On June 13, 2001 at 02:57:57, Uri Blass wrote:
>On June 13, 2001 at 01:51:34, Dieter Buerssner wrote:
>
>>On June 11, 2001 at 01:31:14, Jouni Uski wrote:
>>
>>> 8/4k3/2K5/6p1/6B1/7P/8/8 w - -
>>
>>[...]
>>>Hmm. Should this already be solved poblem?
>>
>>I think, if you can give a rule, under which conditions such positons -
>>characterized as one side has a rook pawn and a "wrong" bishop and the other
>>side has a pawn in the file next to the rook pawn - are drawn, it will soon be a
>>solved problem for many chess engines :-)
>>
>I believe that every position when white has the wrong bishop when black has not
>more than one pawn is a draw if black can get into the corner or near the
>corner because4 capturing the pawn with the pawn means stalemate.
I think, I can see your point. However look at this position:
[D]8/7k/4K1p1/8/7P/3B4/8/8 w - -
With 4-men TBs:
492 0.084 Mat10 4t 1.h5 Kh8 2.hxg6 {EGTB} 2...Kg7! 3.Be4 Kf8 4.Bc6
Kg7! 5.Kf5! Kg8 6.Kf6! Kh8 7.g7+! Kg8 8.Bd5+!
Kh7 9.g8=Q+ Kh6 10.Qh8# {1351}
I think, it fits your stated rule (or I have misunderstood ...). Black is
already on one of the usually "safe" places with his king. It is laso two steps
nearer to h8 than the white king (and pawn). This will without a black pawn
allways be suffisient for a draw (as you explained to me very well some time
ago). But still here, it is lost for black. I have no idea, if this has any
practical relevance for a chess engine. Probably, in almost all case, such a
rule will still work, and in the exceptional cases, a very shallow search will
help.
Regards,
Dieter
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