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Subject: Re: Mate in 38.

Author: Paul

Date: 16:40:58 01/25/01

On January 24, 2001 at 19:39:52, Dan Andersson wrote:

>[D]1R6/6pK/5p2/4p3/1B1p3n/8/p1p1pp2/1k3b2 w - - 0 1
>Krabbé (1985)

I just tried this position with my program Pretz, after having unsuccesfully
grappled with the mate in 16/20 positions by José Antônio Fabiano Mendes
(I ran out of patience :) and indeed get a mate in 38! It's amazing!

02:17 WM38 09 1. Ba3+ Ka1 2. Bb2+ Kb1 3. Bxd4+ Kc1 4. Be3+ Kd1 5. Rd8+ Ke1 6.
Bd2+ Kd1 7. Bb4+ Kc1 8. Ba3+ Kb1 9. Rb8+ Ka1 10. Bb2+ Kb1 11. Bxe5+ Kc1 12. Bf4+
Kd1 13. Rd8+ Ke1 14. Bd2+ Kd1 15. Bb4+ Kc1 16. Ba3+ Kb1 17. Rb8+ Ka1 18. Bb2+
Kb1 19. Bxf6+ Kc1 20. Bg5+ Kd1 21. Rd8+ Ke1 22. Bd2+ Kd1 23. Bb4+ Kc1 24. Ba3+
Kb1 25. Rb8+ Ka1 26. Bb2+ Kb1 27. Bxg7+ Kc1 28. Bh6+ Kd1 29. Rd8+ Ke1 30. Bd2+
Kd1 31. Bb4+ Kc1 32. Ba3+ Kb1 33. Rb8+ Ka1 34. Be7 c1=Q 35. Bf6+ Qb2 36. Rxb2
e1=Q 37. Rb8+ Qe5 38. Bxe5x

I used 96MB hash and full ply extensions on check and one-rep, and some
other tricks :) Does this look ok? Has anyone else tried this position?

Groetjes,
Paul

Re: Mate in 38. Heiner Marxen 17:31:55 01/25/01
- Re: Mate in 38. Paul 17:41:50 01/25/01
  - Re: Mate in 38. Heiner Marxen 18:48:06 01/25/01
    - Re: Mate in 38. Uri Blass 19:31:33 01/25/01
      - Re: Mate in 38. Heiner Marxen 20:41:52 01/25/01
    - Re: Mate in 38. Paul 19:01:39 01/25/01
Re: Mate in 38. Dann Corbit 17:02:19 01/25/01
- Re: Mate in 38. Olaf Jenkner 11:25:09 01/29/01
  - Re: Mate in 38. Heiner Marxen 13:16:59 01/29/01
    - Re: Mate in 38. Olaf Jenkner 10:53:04 01/30/01
      - Re: Mate in 38. Uri Blass 13:53:12 01/30/01
        
        Sorry, my mistake Olaf Jenkner 14:15:45 01/30/01
        
        Re: Mate in 46 Heiner Marxen 07:25:50 01/31/01
        
        Re: Mate in 46 Dann Corbit 14:54:13 01/31/01
        
        Re: Mate in 46 Heiner Marxen 15:18:55 01/31/01
        
        Re: Mate in 46 Paul 13:08:26 01/31/01
        
        Re: Mate in 46 Heiner Marxen 15:10:40 01/31/01
        
        Re: Mate in 46 Enrique Irazoqui 08:25:25 01/31/01
        
        Re: Mate in 46 Ignacio Santos Crespo 14:47:23 02/01/01
        
        Re: Mate in 46 Heiner Marxen 04:47:52 02/02/01
        
        Re: Mate in 46 Enrique Irazoqui 05:40:06 02/02/01
        
        Re: Mate in 46 Uri Blass 12:25:13 02/02/01
        
        Re: Mate in 46 Enrique Irazoqui 13:12:13 02/02/01
        
        Re: Mate in 46 Heiner Marxen 09:58:53 02/02/01
        
        Re: Mate in 46 Enrique Irazoqui 10:23:43 02/02/01
        
        Re: Mate in 46 Paul 10:10:23 02/02/01
        
        Re: Mate in 46 Heiner Marxen 12:12:39 02/02/01
        
        Re: Sorry, my mistake Uri Blass 15:22:47 01/30/01
        
        Re: Sorry, my mistake Uri Blass 15:24:49 01/30/01
        
        Re: Sorry, my mistake Paul 15:38:31 01/30/01
        
        To Mr. Fermat Olaf Jenkner 16:14:35 01/30/01
        
        Re: To Mr. Wiles Paul 16:31:08 01/30/01
        
        Re: To Mr. Harris: Dann Corbit 17:31:49 01/30/01
  - Re: Mate in 38. Paul 11:37:59 01/29/01
- Re: Mate in 38. Paul 17:04:20 01/25/01
  - Re: Mate in 38. Uri Blass 19:18:42 01/25/01
    - Re: Mate in 38. Paul 00:38:51 01/26/01

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