Computer Chess Club Archives




Subject: Re: One mate to solve... that now is very easy.

Author: Paul

Date: 12:16:29 05/06/01

Go up one level in this thread

On May 06, 2001 at 13:26:26, Heiner Marxen wrote:

>On May 06, 2001 at 11:55:05, Paul wrote:

>>06:18 WM9 09 Bxc7+ Qbxc7 Qxc7+ Qxc7 Qxd6+ Qcxd6 Nxe6+ Qexe6 Qfxf6+ Re7 Rxd6+
>>Qxd6+ Qxd6+ Bd7 Qhxf8+ Qxf8 Qcc7#
>Well, 6:18 is not exactly fast, right?
>I will try this one later, have started with the second one.  See below.

For me everything within 1 hour is ok ... but for a mate in 9 it isn't lightning
fast, no.

>>No ... it wasn't too hard, Leonid! You must really be a nice guy, thinking about
>>our feelings like that, thanks! ;)
>The one who tortures us daily with bizarre mate problems?  :-))

Ahh ... for me it's more of a social event, keeps me from doing "cats-evil" as
we call it (mischief). :)

>But seriously: if they are too hard, he will not get much helpful response.
>OTOH, we may feel pressed to improve our programs...

I hope to get mine as good as Chessmaster & Junior in solving mates! Well ... I
can always dream, can't I? ;) Johan ... als je dit leest ... any tips? :)

>>00:04 WM6 06 Qxc7+ Nxc7 Nxd6 Nxa5 Qxd7+ Nxd7 Nc6+ Nxc6 Ncb7+ Qxb7 Nxb7#
>For sure it really is a mate in 6:
>ChestMate = Pretzmate /* -1 */;		/* bugfix by Heiner */

 // darn another one! Thanks Heiner!

>It has multiple solutions, there are 6 key moves:

>Bxc7+ Nxc7  Qxc7+  Bxc7  Bxf7   Bxd5  Nxc6+  Nxc6  Rxe8+  Qxe8  Qxe8#
>Bxf7  Nxc5  Nxc6+  Nxc6  Q7xc6  Bd7   Rxe8+  Bxe8  Qexe8+ Qxe8  Qxe8#
>Nxc7  Bb3+  Qxb3   Nxc7  Nxc6+  Nxc6  Qbxf7  Nce5  Qxd7+  Nxd7  Qxd7#
>Nxd6  Naxb6 Q7xb6  Nxa5  Nexf7+ Bxf7  Nf4    Bb3+  Qxb3   Ne5   Ndb7#
>Qxc7+ Nxc7  Bxc7+  Bxc7  Bxf7   Bxd5  Nxc6+  Nxc6  Rxe8+  Qxe8  Qxe8#
>Qxf7  Qxf7  Nxf7+  Bxf7  Nxd6   Nde5  Nxf7+  Nxf7  Nxc7+  =*=   N7e6#
>That took 28.4 minutes (!) (K7/600, 350MB hash)
>depth  seconds
>#  3      0.15  0.99        386-         0
>#  4      4.19  1.25       9199-         0
>#  5     95.47  1.55     219507-         0
>#  6   1704.26  1.86    4219473-      9977
>Chest needed an average of 2.5 black moves to refute at the top level,
>what is unusually large, and contributes to the comparatively large time.

But impeccable as always!

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