Author: Enrique Irazoqui

Date: 05:40:06 02/02/01

Go up one level in this thread

On February 02, 2001 at 07:47:52, Heiner Marxen wrote: >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 Junior 6 says mate in 42 after 2... Bg6+ in 55 seconds on a P750, 128MB hash, see below. I find very impressive that a playing program can see so far ahead and so quickly. I'm trying from the initial position with Deep Junior, but after 14 hours it doesn't see the mate yet. Enrique 2N5/p4P2/p4RbP/P2kr2K/5RN1/2PPBPP1/3P1p2/5Q2 w - - 0 1 Analysis by Junior 6.0: 3.Kxg6 Rg5+ +- (34.96) Depth: 3 00:00:00 3.Kxg6 Rg5+ +- (34.96) Depth: 6 00:00:00 3.Kxg6 Rg5+ +- (34.96) Depth: 9 00:00:00 2kN 3.Kxg6 Rg5+ +- (34.96) Depth: 12 00:00:00 5kN 3.Kxg6! +- (35.26) Depth: 15 00:00:00 20kN 3.Kxg6! +- (35.56) Depth: 18 00:00:00 71kN 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 +- (27.69) Depth: 21 00:00:00 211kN 3.Kxg6! +- (27.99) Depth: 24 00:00:00 296kN 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 +- (32.02) Depth: 24 00:00:00 392kN 3.Kxg6! +- (32.32) Depth: 27 00:00:01 790kN 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 +- (32.32) Depth: 30 00:00:02 1089kN 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 +- (24.40) Depth: 33 00:00:03 2227kN 3.Kxg6! +- (24.70) Depth: 36 00:00:04 2379kN 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 +- (25.16) Depth: 36 00:00:04 2608kN 3.Kxg6! +- (25.46) Depth: 38 00:00:05 2897kN 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 +- (28.35) Depth: 38 00:00:06 3153kN 3.Kxg6! +- (28.65) Depth: 40 00:00:08 4369kN 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 +- (32.74) Depth: 40 00:00:11 6960kN 3.Kxg6! +- (33.04) Depth: 42 00:00:16 9629kN 3.Kxg6! +- (33.34) Depth: 44 00:00:23 14185kN 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 +- (#42) Depth: 44 00:00:55 40825kN 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 +- (#42) Depth: 44 00:00:55 40825kN (Irazoqui, Cadaqués 02.02.2001)

- Re: Mate in 46
**Uri Blass***12:25:13 02/02/01*- Re: Mate in 46
**Enrique Irazoqui***13:12:13 02/02/01*

- Re: Mate in 46
- Re: Mate in 46
**Heiner Marxen***09:58:53 02/02/01*- Re: Mate in 46
**Enrique Irazoqui***10:23:43 02/02/01* - Re: Mate in 46
**Paul***10:10:23 02/02/01*- Re: Mate in 46
**Heiner Marxen***12:12:39 02/02/01*

- Re: Mate in 46

- Re: Mate in 46

This page took 0.01 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.