Author: Paul
Date: 13:08:26 01/31/01
Go up one level in this thread
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. Hey, congrats!! How does that feel? ... great doesn't 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# Very funny line! >I even had to increase the maximal allowed depth in Chest (formerly 30). >Quite an exceptional position! I also increased my maxdepth to 256 plies before trying the Mate in 120 one :) But alas ... it didn't work. You can solve this one probably because it's a short mate everytime the Rook stops checking? >Can the playing programs solve this, also? I suspect so. I don't think so ... mine doesn't, anyway. Not that that says anything :) Maybe a singular extension program like Ferret could succeed; I think full ply se's might just do it. Would give it a try myself, but don't have them (yet)! Also maybe the position after the 3rd White or Black move, when the Crazy Rook starts checking is doable within a week or so ... I see the first 23 ply of the pv on my screen and that looks promising ;) Groetjes, Paul
This page took 0.02 seconds to execute
Last modified: Thu, 07 Jul 11 08:48:38 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.