Author: Ignacio Santos Crespo
Date: 14:47:23 02/01/01
Go up one level in this thread
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")
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