Author: Robin Smith
Date: 12:53:03 07/05/05
Go up one level in this thread
On July 05, 2005 at 15:04:13, Eugene Nalimov wrote: >On July 05, 2005 at 14:41:42, Dieter Buerssner wrote: > >>On July 05, 2005 at 13:37:55, Terry McCracken wrote: >> >>>On July 05, 2005 at 13:01:07, Yar wrote: >>> >>>>8/7p/4k3/2B5/1P2K3/1r6/8/8 b - - >>> >>>Yes it appears to be a draw unless there is something hidden in the position? >> >>This is a 6-men position. As far as I know, this particular 6-men TB has never >>been available from Robert Hyatt's ftp. But Marc Bourzutschky has created all >>6-men TBs in the chessmaster format. He should be able to give a definite result >>to this position. He might not read this thread. You should be able to find his >>email adress by the CCC search engine. >> >>Regards, >>Dieter > >C:\Crafty>wcrafty.exe > >Initializing multiple threads. >System is SMP, not NUMA. >unable to open book file [./book.bin]. >book is disabled >unable to open book file [./books.bin]. > >Crafty v19.18 (1 cpus) > >White(1): tbpath=k:\32;k:\21;k:\41;k:\31;k:\22;f:\33p >6 piece tablebase files found >93611kb of RAM used for TB indices and decompression tables >White(1): 8/7p/4k3/2B5/1P2K3/1r6/8/8 b - - >1. ... Rb1! 2. Kf4! Kd5! 3. Kg5 Ke4! 4. Kg4! Ra1 5. Bb6 Ra6 6. Bc5! >Rg6+! 7. Kh3! Kf3! 8. Kh2! Rg2+ 9. Kh3! Rb2 10. Bf8 Rb1! 11. Kh2! >Kg4! 12. Bg7 Rxb4! 13. Be5! Ra4 14. Bb8 Ra2+ 15. Kg1! Kh3 16. Bc7 >Rg2+ 17. Kf1! Rg4 18. Kf2! Rg6 19. Bb8 Rg2+ 20. Kf1! Rg4! 21. Bc7 >Kh4! 22. Bb8 Kg5 23. Kf2 Kf5 24. Bg3 h5! 25. Kf3! h4! 26. Bb8 Rb4 >27. Ba7! Rb2 28. Bd4! Ra2 29. Bb6 h3! 30. Bc7! h2! 31. Bxh2! Rxh2! >32. Ke3! Rh4 33. Kd3! Re4 34. Kc3 Kf4! 35. Kd3 Kf3! 36. Kd2 Re3! >37. Kd1! Re2! 38. Kc1 Rf2 39. Kd1 Ke3! 40. Kc1! Kd3! 41. Kb1! Kc3! >42. Ka1! Kb3! 43. Kb1 Rf1# > puzzling over a move to ponder. > depth time score variation (1) >Black(1): Rb1 [pondering] > clearing hash tables > time surplus 0.00 time limit 30.00 (3:30) > depth time score variation (1) > time=0.02 cpu=0% mat=-2 n=113 fh=100% nps=10K > ext-> chk=0 cap=0 pp=0 1rep=0 mate=0 > predicted=0 nodes=113 evals=17 50move=0 > endgame tablebase-> probes=15 hits=15 > hashing-> 65%(raw) 65%(depth) 0%(sat) 94%(pawn) > hashing-> 65%(exact) 0%(lower) 0%(upper) > SMP-> split=0 stop=0 data=0/128 cpu=0.00 elap=0.02 I was wondering what the truth was in this position. Several programs rush to push the h pawn, but this leads to a draw even if White lets go of the b pawn. For example: 1... h5 2. Kf4 Kf6 3. Bd6 Rh3 4. Bc5 Rh4+ 5. Kg3 Rc4 6. Bf8 h4+ 7. Kg2 and although several programs believe Black has been making steady progress (Shredder and Fruit both see > 4 pawns advantage), if you remove White's b-pawn (which souldn't be hurting White) it is immediately recognized as a 5 piece tablebase draw. When will this 6 man ending be available to download somewhere? R+P vs B+P is one of the more interesting cases. -Robin
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