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Subject: Re: Crafty evals

Author: Miguel A. Ballicora

Date: 20:45:54 09/21/01

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On September 21, 2001 at 23:01:29, Robert Hyatt wrote:

>On September 21, 2001 at 17:01:35, Miguel A. Ballicora wrote:
>
>>On September 21, 2001 at 16:45:44, Robert Hyatt wrote:
>>
>>>On September 21, 2001 at 16:27:01, Gian-Carlo Pascutto wrote:
>>>
>>>>On September 21, 2001 at 14:57:20, Robert Hyatt wrote:
>>>>
>>>>>I don't mind that kind of mis-evaluation so much.  If anybody wins, white
>>>>>wins.  What I would not like is to see that kind of evaluation and then lose
>>>>>the game...
>>>>
>>>>The problem is when crafty prefers the 1.8 from this ending over the 1.7 from
>>>>another ending that _is_ won for white.
>>>>
>>>>That'll cost you half a point.
>>>>
>>>>--
>>>>GCP
>>>
>>>
>>>I don't disagree.  But it is just as important to not lose when you can win
>>>or draw.  The not drawing when you can win is another level of tuning.  I need
>>>to study the ending because a pawn on the a and c file becomes very hard for
>>>a lone king to stop...  it might have simply made a mistake and drawn a won
>>>position in this case..  I didn't look at it very carefully (yet).
>>
>>It looks drawn. As you already know, the advantage of the outside passer is that
>>you can sacrifice it and the king can go and eat up the opponent pawns on the
>>other side. In this case it is impossible (that's the problem here). For
>>instance, place the pawns in g6,h5,g4. How can the white king capture them? it
>>can't because as soon as you capture g6 black plays h4 and promotes. On the
>>other hand, two passers cannot beat a king on the Q side, they need the help of
>>the wKing. however, the wK cannot go to the Q side because black promotes.
>>
>>Regards,
>>Miguel
>
>
>I don't believe it is quite that simple.  If the pawns are zugged on the
>kingside, the two passers on the queenside can easily win.  This is the
>attraction of "wild 7" on ICC, which is what the "mini game" is all about.

I am not sure what you mean by zugged pawns. Anyway, white cannot capture the
pawns in any case, so how can white win? two passers, if they are not separated
enough, cannot win without king support.
The only chance is a race, when white king rush to the Q side to support them
letting a black pawn to promote.


>In this zug-less position (at present) things aren't so clear, of course,
>but
>put the black pawns at g5 and h6 and the white pawn at g4, and this turns
>into a simple white win...

Black plays h5 and it is a draw. I think I did not understand.

Regards,
Miguel




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