Author: Heiner Marxen
Date: 04:47:52 02/02/01
Go up one level in this thread
On February 01, 2001 at 17:47:23, Ignacio Santos Crespo wrote: >On January 31, 2001 at 11:25:25, Enrique Irazoqui wrote: > >>On January 31, 2001 at 10:25:50, Heiner Marxen wrote: >> >>>On January 30, 2001 at 17:15:45, Olaf Jenkner wrote: >>> >>>>Perhaps I had in mind this problem what is easily to prove that there is >>>>no shorter mate. >>>> >>>>Pervakow/Sum. #46 >>>>[D]2N5/p4P2/p4RqP/P2krb2/5RNK/2PPBnP1/3P1pP1/5Q2 w - - 1 0 >>> >>>Yes, that can be. Much to my own surprise Chest really proves this >>>as a mate in 46 moves, and needs just 8.2 seconds (K7/600) for it. >>>It gives the following PV: >>> >>> 1. gxf3 Qh5+ >>> 2. Kxh5 Bg6+ >>> 3. Kxg6 Rg5+ >>> 4. Kh7 Rg7+ >>> 5. Kh8 Rh7+ >>> 6. Kg8 Rh8+ >>> 7. Kg7 Rh7+ >>> 8. Kf8 Rh8+ >>> 9. Ke7 Re8+ >>>10. Kd7 Rd8+ >>>11. Kc7 Rd7+ >>>12. Kb8 Rb7+ >>>13. Ka8 Rb8+ >>>14. Kxa7 Rb7+ >>>15. Kxa6 Ra7+ >>>16. Kb5 Rxa5+ >>>17. Kb4 Rb5+ >>>18. Ka3 Rb3+ >>>19. Ka2 Rb2+ >>>20. Ka1 Ra2+ >>>21. Kb1 Rb2+ >>>22. Kc1 Rb1+ >>>23. Kc2 Rb2+ >>>24. Kd1 Rb1+ >>>25. Ke2 Re1+ >>>26. Kxf2 Re2+ >>>27. Kg1 Rg2+ >>>28. Kh1 Rg1+ >>>29. Kh2 Rh1+ >>>30. Kg2 Rg1+ >>>31. Kh3 Rxg3+ >>>32. Kh4 Rh3+ >>>33. Kg5 Rh5+ >>>34. Kg6 Rg5+ >>>35. Kh7 Rg7+ >>>36. Kh8 Rh7+ >>>37. Kg8 Rh8+ >>>38. Kg7 Rh7+ >>>39. Kg6 Rg7+ >>>40. Kh5 Rg5+ >>>41. Kh4 Rh5+ >>>42. Kg3 Rh3+ >>>43. Kf2 Rxf3+ >>>44. Ke2 Rf2+ >>>45. Nxf2 Ke5 >>>46. R4f5# >>> >>>I even had to increase the maximal allowed depth in Chest (formerly 30). >>>Quite an exceptional position! >>> >>>Can the playing programs solve this, also? I suspect so. >> >>92 plies? You must be kidding. They pick gxf3 instantly with a huge score, but >>no mate. I only tried Deep Fritz, Gambit Tiger and Shredder 5, but I don't think >>any playing program will see it. >> >>Enrique >> >>>Heiner > >On my Pentium 166 after 2... Bg6+, Junior 6 (with 15 Mb. hash) say mate in 42 >(6´2") While I'm pleased to hear that a program solved this one, from the above I believe "mate in 44" would be correct, not "mate in 42". Can you show us a PV? I would like to check it. Someone errs, and I'd like to know who. Heiner
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