Computer Chess Club Archives




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

Author: Paul Byrne

Date: 00:18:23 05/07/01

Go up one level in this thread

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

>On May 06, 2001 at 10:13:27, leonid wrote:
>>On May 06, 2001 at 06:22:26, leonid wrote:
>>>If you would like to solve a mate, you can try this moderate position:
>>>[D]Qqrkrq1Q/1QqqqqQ1/qBbnnbBq/1NQ2QN1/8/2Q2Q2/3RR3/3K4 w - -
>>>Please indicate your result.
>Ok ... my guess, before Heiner moves in with his heavy artillary, a mate in 9:
>06:18 WM9 09 Bxc7+ Qbxc7 Qxc7+ Qxc7 Qxd6+ Qcxd6 Nxe6+ Qexe6 Qfxf6+ Re7 Rxd6+
>Qxd6+ Qxd6+ Bd7 Qhxf8+ Qxf8 Qcc7#

G2K's PN search says:

1W. i=8094 n=324622 p=0 d=1000000000 t=3.620
1W. Qxc7 wins!

3.62 seconds, 324633 nodes.  This is the kind of mate PN does well in, although
it doesn't get you a mate-in-n number.

>>After sending this last position I went to see its branching factor on one
>>professional program. I took it recently from the Web. After thinking for a
>>while program stopped breathing. Sudden death. Then I felt me a little bit
>>guilty by presenting upper position for Sunday. Better will be the next one that
>>is really. I did it yesterday before comming to the position that is above.
>No ... it wasn't too hard, Leonid! You must really be a nice guy, thinking about
>our feelings like that, thanks! ;)
>>[D]nqrkrqn1/1QqnnqQ1/1BnbbnB1/BQNNNNQB/8/8/3RR3/3KQ3 w - -
>>Please indicate your result.
>This one's a bit too easy, haha, found a mate in 6:
>00:04 WM6 06 Qxc7+ Nxc7 Nxd6 Nxa5 Qxd7+ Nxd7 Nc6+ Nxc6 Ncb7+ Qxb7 Nxb7#
>Have a nice Sunday,

And on this one,

1W. i=255976 n=8485323 p=0 d=1000000000 t=76.740
1W. Bxc7 wins!

Which is interesting.  I think the first one was the easy one.  :)
The non-checking move in there gives PN search a tough time.

Thanks for the interesting problems...
-paul [the other one  :)]

By the way, the second one is also a win in ICC's wild 17.  Forgot to switch
variants on my first attempt...

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Last modified: Thu, 07 Jul 11 08:48:38 -0700

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