Computer Chess Club Archives




Subject: Re: Mate to solve in two flavours.

Author: Paul Byrne

Date: 15:21:08 05/07/01

Go up one level in this thread

On May 07, 2001 at 17:48:03, Paul wrote:

>On May 07, 2001 at 16:23:20, leonid wrote:
>>And how about solving mate in two variations? We will start with female side.
>>Contain more esthetic and demand very gentle approach.
>>[D]Qn1q1nQ1/1QNbNQ2/1qqkqq2/1QrqrQ2/1q1N1q2/3q4/B1RbR1B1/B2K2B1 w - -
>Mate in 8 in half a minute ...
>00:27 WM8 06 Ne8+ Qxe8 Nc8+ Qexc8 Qgxf8+ Qfe7 Q7xe6+ Rxe6 Rxe6+ Qxe6 Qxe6+ Bxe6
>Qbxe7+ Ke5 Nxc6#

G2K says:
1W. i=9769 n=301215 p=0 d=1000000000 t=4.780
1W. Ne8 wins!

You got me curious so I had G2K dump a complete solution tree this time and
picked out the longest line, which was:

1. Ne8 Qxe8 2. Qaxb8 Qbc7 3. Nc8 Qxc8 4. Qgxf8 Qfe7 5. Q5xe6 Qxe6 6. Q5xc6 Bxc6
7. Q8xc7 Qxc7 8. Qxe6 Rxe6 9. Rxe6 Kd7 10. Qfc8

>>Second is almost the same position but contain slight genetical modification. It
>>expect from you more brute force in order to reach the same result.
>>[D]Qn1q1nQ1/1QNbNQ2/1qqkqq2/1QrqrQ2/1q1N1q2/3q4/3b4/Q2K2Q1 w - -
>Mate in 11 in half an hour, don't know the exact time, as the job ran in the
>background, the solution looks a bit like the unlocking of a safe ... nice :):
>29:57 WM11 09 Ne8+ Qxe8 Nc8+ Qexc8 Qgxf8+ Qfe7 Q7xe7+ Qxe7 Qaxb8+ Qbc7 Qgg6+ Re6
>Q8xc7+ Q8xc7 Qxc7+ Qxc7 Qaa6+ Bc6 Qgxe6+ Qxe6 Qxe6#

Here I got

1W. i=51133 n=1222688 p=0 d=1000000000 t=19.220
1W. Nc8 wins!


1. Nc8 Qxc8 2. Ne8 Qcxe8 3. Qgxf8 Qfe7 4. Qaxb8 Qbc7 5. Q8xe7 Q8xe7 6. Qxe7 Qxe7
7. Q7xc7 Qxc7 8. Qbxd7 Qxd7 9. Qbf8 Qe7 10. Qgg6 Re6 11. Qfxe6 Qxe6 12. Qxe6


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