Author: Uri Blass
Date: 12:18:35 03/08/02
Go up one level in this thread
On March 08, 2002 at 14:46:41, Miguel A. Ballicora wrote: >On March 08, 2002 at 12:43:05, Uri Blass wrote: > >>On March 08, 2002 at 12:31:14, Heiner Marxen wrote: >> >>>On March 08, 2002 at 09:22:58, Ed Schröder wrote: >>> >>>>[d]4r3/p1p1pPp1/P1P1P1P1/5K2/3p2P1/7p/3P1ppr/3R1nkq w - - id M19; >>>> >>>>I came across this beauty, mate in 19 moves. Rebel has no clue. >>>> >>>>Ed >>> >>>After 15 minutes (Athlon 1500+, 128 MB hash) Chest says "no mate in 12". >>>With an EBF above 6 this extrapolates to 8 years for the mate in 19. >>>Uhh. >>>Not reachable for Chest, as is. >>> >>>Cheers, >>>Heiner >> >>I am not so sure >>Maybe chest is going to surprise us and find an alternative mate in 14. >> >>I also could not prove that there is no shorter mate then mate in 19 so I cannot >>be sure that the mate in 19 that I found is really the shortest mate. > >There is no shorter mate than 19. It is very easy to solve but it is beautiful! > >Regards, >Miguel Did you prove it? The only way is to prove that black can draw or force a checkmate after every alternative to the original solution. I found a mate in 19 by myself but I did not try to prove that it is the shortest mate. I need to prove that black can force at least a draw after moves like 1.Rc1,1.Rb1,1.Ra1 2.Nd6 when my program do not find a forced mate and there is no option with the commercial programs to search for a forced mate or repetition that may be an easier task. Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.