Author: Uri Blass
Date: 21:12:53 03/08/02
Go up one level in this thread
On March 08, 2002 at 18:46:01, Miguel A. Ballicora wrote: >On March 08, 2002 at 15:18:35, Uri Blass wrote: > >>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. > >You can use logic to prove too. If you do not follow the solution path, black is >stalemated immediately or liberated, in that case black wins. > >Miguel It is not a proof. After Rc1 only the black rook can move except d3 so I am not sure that black wins. white may have ideas of capturing the black d pawns and getting progress with the white d pawn or promoting f7f8Q if the rook leaves the 8 rank. I guess that they do not work but this is not a proof. I also did not prove that black can get stalemate in the other alternatives and it is possible that there is something that I missed(I did not check every possible different line like fxe8N d3 Nd6 exd6 and it may be possible that in some line white can play something like Rb1,Rb2 and win. It does not seem to be true but it is not a proof. Uri
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