Author: Jeremiah Penery
Date: 06:41:45 02/16/99
Go up one level in this thread
On February 16, 1999 at 09:11:09, Laurence Chen wrote:
>On February 16, 1999 at 08:34:03, Luis E. Cabral M. wrote:
>
>>Where can I find different kind of mates in more than 10 moves?
>>
>>Thanks in advance.
>Try this mate in 30. It's from the Millenium website under Shredder homepage.
>It's said that Shredder can find mate in 30 in fraction of seconds which I find
>hard to believe because none of my engines Fritz 5.32, Junior 5, CM 6000 are
>able to find the mate in 30, even Crafty 16.4. Although Crafty display an odd PV
>when analysing this position. Perhaps I should allow my engines run longer than
>15 minutes for this problem.
>5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - 0 1
My Crafty finds it under 2 minutes on a PII-300:
11-> 1:39 Mat30 1. Neg4+ Kf5 2. Nh6+ Ke5 3. Nf7+ Kf5
4. Nd6+ Ke5 5. Ng4+ Kd5 6. Ne3+ Ke5
7. Nf7+ Ke4 8. Ng5+ Ke5 9. Nf3+ Ke4
10. Nxd2+ Ke5 11. Nf3+ Ke4 12. Ng5+
Ke5 13. Nf7+ Ke4 14. Nd6+ Ke5 15. Ng4+
Kd5 16. Nf6+ Ke5 17. Nf7+ Kf5 18. Nh6+
Ke5 19. Nhg4+ Kf5 20. Ne3+ Ke5 21.
Nfg4+ Ke4 22. Nf2+ Ke5 23. Nxd3+ Ke4
24. Nf2+ Ke5 25. Nfg4+ Ke4 26. Nf6+
Ke5 27. Nc4+ Kf5 28. Nd6+ Ke5 29. Ng4+
Kd5 30. c4#
It is made much easier because every move is a checking move. I also have
Crafty's extensions raised a little, but, surprisingly, not very many were done
while searching this (Out of 25 million nodes, less than 2 million were
extensions).
Jeremiah
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