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Subject: Re: If you like solving forced mate...

Author: leonid

Date: 06:00:10 02/18/01

Go up one level in this thread


On February 17, 2001 at 14:52:18, Heiner Marxen wrote:

>On February 15, 2001 at 06:10:16, leonid wrote:
>
>>Hi!
>>
>>If you like solve one forced mate, you can try this:
>>
>>[D]3BQnQN/3b3q/2Q3rn/KR2Qqbk/1R2Qqrn/2Q4b/3b1n1q/1Q1BQ1QN w - -
>>
>>Please, indicate your result.
>>
>>If you could bring one position of forced mate found during the chess
>>chapionship (human player) it will be very appreciated.
>>
>>Thanks,
>>Leonid.
>
>If I followed correctly the answers of the others, this has solutions
>in nine moves.  After 26 hours on a K7/600 (350 MB hash) Chest found
>a mate in 8 moves, that does not start with a checking move, and leaves
>black with 35 legal answers.  Obviously, that is not the path the playing
>programs like to follow.  ;-)

Thanks, Heiner! Now I see why this position is not at all "easy". Shortest move
that lead to mate have nothing to do with checking move, like I found with
selective move in 10. Will go back to see, just curious, but I think that nobody
found mate in 8 after your message.

Regards,
Leonid.


>Here are the main lines after 1.Qxh7, one for each answer:
>
>Bxd8+ Qxd8  Nxh7 Ng3+  Qhxg3 Qxh4+ Kxh4 Qcxg3+ Rxg3 Nxg6+  Kg5 Qe7+  Nf6 Qexf6#
>Bxe8  Bxg4+ Bxg4 Qxg4+ Nxg4  Q4xf5 Bc1  Ng3+  Qfxg3 Qhxg6+ =*= Qxg5+ Bxg5 Qxg5#
>Be6   Qxh2   Bc4   Ng3+   Qxg3  Q4xf5  Be2   Nxg6   Nf3   Nxf8+ Kh4 Qhxh6#
>Bxc6  Qxg4+  Bxg4  Q4xf5  Bd5   Qxh6+  Kxh6  Qexg6+ Nfxg6 Qg7+  Kh5 Qh7#
>Q4xe4 Qxg4+  Bxg4  Qhxg6+ Nfxg6 Qcxg6+ Nxg6  Qxg6+  Kh4   Qxh6+ Bh5 Qxh5#
>Be7   Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Kh4   Bxe7+  Qf6   Qeh5#
>Bf6   Qcxf6  Q4g5  Qgxh2  Bf4   Ng3+   Bxg3  Qxg5+  Qxg5  Qxg5#
>Bxc3  Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Bxe1  Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Q5xe4 Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Qe6   Qxh6+  Kxh6  Q8xg6+ Nhxg6 Qxg6+  Nxg6  Qg7+   Kh5   Qh7#
>Qf3   Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Qf6   Qxh6+  Kxh6  Q8xg6+ Qxg6  Qexg6+ Nfxg6 Qg7+   Kh5   Qh7#
>Qf7   Qxh6+  Kxh6  Qexg6+ Qxg6  Qexg6+ Nfxg6 Qg7+   Kh5   Qh7#
>Qfg3  Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Qhg3  Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Ne6   Qhxg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Nf3   Qxh6+  Bxh6  Qexg6+ Nxg6  Qxg6+  Rxg6  Qxg6#
>Ng2   Qxh6+  Kxh6  Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6#
>Nxd1  Qhxg6+ Qxg6  Q8xg6+ =*=   Qexg6+ Nxg6  Qcxg6#
>Nxh7  Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>Q5xe5 Qxh6+  =*=   Q8xg6+ =*=   Qexg6+ Nxg6  Qcxg6#
>Nd3   Qxh4+  Bxh4  Qhxg6+ Nxg6  Qexg6#
>Nxe4  Qxh4+  Bxh4  Qhxg6+ Nxg6  Qexg6#
>Nxh1  Qxh4+  Bxh4  Qhxg6+ Nxg6  Qexg6#
>-*-   Qhxg6+ Nfxg6 Qexg6+ Nxg6  Qxg6+  Qxg6  Qxg6+  Kh4   Qxh6#
>
>Legend:  =*=  any legal move
>         -*-  any other legal move
>
>Heiner



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