Author: Madhavan
Date: 09:34:51 09/08/05
Go up one level in this thread
On September 08, 2005 at 12:04:06, Dieter Buerssner wrote:
http://www.chessbase.com/puzzle/puzz20b.htm
I wonder if you saw this puzzle long time back?
>White has at least a mate of the same length. After 17...g4 I get:
>
>
>8/p7/1p4p1/p7/kq4p1/3Q4/K7/8 w - -
>
>15/41 0:00 +M25 18.Dd7+ Db5 19.Dxg4+ Db4 20.Dd7+ Db5
> 21.Dd4+ Db4 22.Dd3 g5 23.Dd7+ Db5
> 24.Dd4+ Db4 25.Dd3 g4 26.Dd7+ Db5
> 27.Dd2 (930.416) 1238 TB:78
>
>
>
>After 2...e1Q I get:
>
>2Q5/p5p1/1p4p1/p5p1/k3p3/8/K7/4q3 w - -
>
>Engine: Yace via ssh (700 MB)
>von Dieter Buerssner
>
>10/32 0:00 +M40 3.Dc4+ Db4 4.Dc6+ Db5 5.Dxe4+ Db4
> 6.Dd3 g4 7.Dd7+ Db5 8.Dxg4+ Db4
> 9.Dd7+ Db5 10.Dd4+ Db4 11.Dd3 a6
> 12.Dd7+ Db5 (97.621) 1394
>
>I was too lazy, to get a mate score in the front. Now black would just not
>convert - most probably white will mate much faster, then.
>
>This was the tree I analysed from back to front to get the indicated result.
>
>
>[Event "Edited position"]
>[Site "linux"]
>[Date "2005.09.07"]
>[Round "-"]
>[White "-"]
>[Black "-"]
>[Result "1-0"]
>[SetUp "1"]
>[FEN "8/p5p1/1pP3p1/p5p1/k3p3/4p3/K7/8 w - -"]
>
>1. c7 e2 2. c8=Q e1=Q 3. Qc4+ Qb4 4. Qc6+ Qb5 5. Qxe4+ Qb4
>6. Qd3 g4 (6... a6 7. Qd7+ Qb5 8. Qd4+ Qb4 9. Qd3 Qc3
>(9... Qd2+ 10. Qxd2) (9... Qa3+ 10. Qxa3+) 10. Qxc3 {M9})
>(6... Qb2+ 7. Kxb2 Kb4 8. Qd4+ Kb5) 7. Qd7+ Qb5 8. Qxg4+
>Qb4 9. Qd7+ Qb5 10. Qd4+ Qb4 11. Qd3 g5 12. Qd7+ Qb5
>13. Qd4+ Qb4 14. Qd3 g6 (14... g4 15. Qd7+ Qb5 16. Qxg4+
>Qb4 17. Qd7+ Qb5 18. Qd4+) (14... a6 15. Qd7+ Qb5 16. Qd4+)
>15. Qd7+ Qb5 16. Qd4+ Qb4 17. Qd3 a6 (17... g4 18. Qd7+ Qb5
>19. Qxg4+ Qb4 20. Qd7+ Qb5 21. Qd4+ Qb4 22. Qd3 g5 23. Qd7+
>Qb5 24. Qd4+ Qb4 25. Qd3 {M18}) 18. Qd7+ Qb5 19. Qd4+ Qb4
>20. Qd3 g4 21. Qd7+ Qb5 22. Qxg4+ Qb4 23. Qd7+ Qb5 24. Qd4+
>Qb4 25. Qd3 g5 26. Qd7+ Qb5 27. Qd4+ Qb4 28. Qd3 g4
>29. Qd7+ Qb5 30. Qxg4+ Qb4 31. Qd7+ Qb5 32. Qd4+ Qb4
>33. Qd3 Qb2+ 34. Kxb2 Kb4 35. Qc3+ Kb5 36. Qc7 Kb4 37. Kc2
>a4 38. Kd3 Ka5 39. Qc3+ Kb5 40. Qc4+ Ka5 41. Kc3 b5
>42. Qc7# 1-0
>
>It will be very difficult for an engine, to find this from the front. I think
>impossible for any "normal" playing engine.
>
>Regards,
>Dieter
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