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Subject: Re: Valentin Albillo #34 SOLVED !

Author: Dieter Buerssner

Date: 10:10:01 06/29/03

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On June 28, 2003 at 19:02:44, Vincent Lejeune wrote:

>VA.34,T
>8/8/8/8/3p4/2k1p3/2N1P3/3K4 w - - 0 1

Yace. P4, 2.53 GHz, 250 MB hash:
[   nodes    time   score depth]
    876526   1.312   3.55 36.  1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4 9.
                               Nd6+ Kc3 10. Ne4+ Kb2 11. Nc5 Kc3 12. Ke1 Kc4
                               13. Nd3 Kd5 14. Nb2 Ke5 15. Kd1 Kf4 16. Kc2 Kg3
                               17. Nd1 Kg2 18. Kd3 Kf1 19. Nxe3+ Kf2 {340}
    904783   1.342   3.95 37++ 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4 9.
                               Nd6+ Kc3 10. Ne4+ Kb2 11. Nc5 Kc3 12. Ke1 Kc4
                               13. Nd3 Kb5 14. Kf1 Kb6
    907401   1.345   4.95 37++ 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4 9.
                               Nd6+ Kc3 10. Ne4+ Kb2
   1029119   1.470  Mat45 37++ 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4 9.
                               Nd6+ Kc3 10. Ne4+ Kb2 11. Nc5 Kc3 12. Ke1 Kc4
                               13. Nd3 Kd5 14. Kf1 Ke6 15. Kg2 Kf6 16. Kh3 Ke7
                               {260}
   1296273   1.747  Mat39 37t  1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4H 9.
                               Nd6+H Kc3H 10. Ne4+H Kb2H 11. Nc5H Kc3H 12.
                               Ke1H Kc4H 13. Nd3H Kc3H 14. Kf1H Kc4H 15. Kg2H
                               Kc3H 16. Kf3H Kb3H 17. Nf4H Kc4H 18. Ke4H Kc3H
                               19. Kd5H d3H 20. Nxd3H {EGTB} 20...Kd2! 21.
                               Nf4! Ke1! 22. Kd4 Kd2 23. Ke4! Kc3! 24. Kxe3!
                               Kc4! 25. Nh5 Kc5 26. Ke4 Kc6 27. Kf5! Kd6 28.
                               e4! Kd7 29. e5! Ke7 30. e6! Ke8 31. Ng7+ Kd8!
                               32. Ke4! Kc8 33. e7 Kb8 34. e8=Q+ Kb7 35. Qd7+
                               Kb6 36. Kd4 Ka5! 37. Qb7 Ka4 38. Kc4! Ka5 39.
                               Qa7# {1341}
   1296352   1.761  Mat39 37.  1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4 9.
                               Nd6+ Kc3 10. Ne4+ Kb2 11. Nc5 Kc3 12. Ke1 Kc4
                               13. Nd3 Kc3 14. Kf1 Kc4 15. Kg2 Kc3 16. Kf3 Kb3
                               17. Nf4 Kc4 18. Ke4 Kc3 19. Kd5 d3 20. Nxd3
                               {EGTB} 20...Kd2! 21. Nf4! Ke1! 22. Kd4 Kd2 23.
                               Ke4! Kc3! 24. Kxe3! Kc4! 25. Nh5 Kc5 26. Ke4
                               Kc6 27. Kf5! Kd6 28. e4! Kd7 29. e5! Ke7 30.
                               e6! Ke8 31. Ng7+ Kd8! 32. Ke4! Kc8 33. e7 Kb8

and does not find a faster mate until the maximum search depth is finished. Mate
in 24 should really have been found:

  48802667  4:50.3  Mat39 62.  1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5.
                               Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 8. Nb5+ Kc4 9.
                               Nd6+ Kc3 10. Ne4+ Kb2 11. Nc5 Kc3 12. Ke1 Kc4
                               13. Nd3 Kc3 14. Kf1 Kc4 15. Kg2 Kc3 16. Kf3 Kd2
                               17. Nf4 Kc2 18. Ke4 Kc3 19. Kd5 d3 20. Nxd3
                               {EGTB} 20...Kd2! 21. Nf4! Ke1! 22. Kd4 Kd2 23.
                               Ke4! Kc3! 24. Kxe3! Kc4! 25. Nh5 Kc5 26. Ke4
                               Kc6 27. Kf5! Kd6 28. e4! Kd7 29. e5! Ke7 30.
                               e6! Ke8 31. Ng7+ Kd8! 32. Ke4! Kc8 33. e7 Kb8
                               34. e8=Q+ Kb7 35. Qd7+ Kb6 36. Kd4 Ka5! 37. Qb7
                               Ka4 38. Kc4! Ka5 39. Qa7# {1341}

Regards,
Dieter



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