Author: Heiner Marxen
Date: 07:25:50 01/31/01
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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. Heiner
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