Author: José de Jesús García Ruvalcaba
Date: 03:22:24 09/30/03
Go up one level in this thread
On September 29, 2003 at 09:46:08, Uri Blass wrote: >On September 29, 2003 at 09:39:44, Uri Blass wrote: > >>On September 29, 2003 at 09:36:29, Uri Blass wrote: >> >>>On September 29, 2003 at 08:47:20, Drexel,Michael wrote: >>> >>>>On September 29, 2003 at 08:36:33, Uri Blass wrote: >>>> >>>>>On September 29, 2003 at 07:08:48, Drexel,Michael wrote: >>>>> >>>>>>On September 29, 2003 at 06:36:42, José de Jesús García Ruvalcaba wrote: >>>>>> >>>>>>>On September 29, 2003 at 06:31:13, Drexel,Michael wrote: >>>>>>> >>>>>>>>On September 29, 2003 at 06:21:18, José de Jesús García Ruvalcaba wrote: >>>>>>>> >>>>>>>>>[D] 8/8/p4Bp1/1pPb2P1/1P2kp2/P7/5K2/8 w >>>>>>>>>From Bellon-Minic, only 41. c6!! draws, all other moves lose. >>>>>>>>>José. >>>>>>>> >>>>>>>> >>>>>>>>Are you sure >>>>>>>>Show me how to win with black after 41.Bd8 for example. >>>>>>>> >>>>>>>>Michael >>>>>>> >>>>>>>After Bd8, black plays Bc6!, then f3, then the black king goes to capture the >>>>>>>a3-pawn, then return to e4 and puts white in Zugzwang. >>>>>>>José. >>>>>> >>>>>>Hmm, maybe you can do some triangulation with the King before playing a5. >>>>>>I am not sure though. >>>>>>I also dont see why c6 should be a draw then. >>>>>>How did the game end? >>>>>> >>>>>>Michael >>>>> >>>>>I did not analyze it but after c6 the white bishop can protect b4 from e7 >>>> >>>>I also can not analyze it now. >>>>If the c6 pawn and the a3 pawn are gone and white protects b4 from e7, how can >>>>white prevent black from playing Ka4 followed by a5? >>>> >>>>Michael >>> >>>You are right and it seems not possible and maybe the idea of white is that >>>after c6 the move Bb6 prevents f2 so the white bishop should go to a5 to prevent >>>a5 or to b6 to prevent f2 dependent on the black king. >>> >>>Uri >> >>The only problem is that I do not see at this moment how can black get f2 when >>the white king is always at f2 and I do not see the zugzwang even with the pawn >>c5. >> >>Uri > >The idea of black may be a5 at some point when bxa5 lose against b4 and Bxa5 >lose against Kxg5 >I still do not see exactly how it is prevented without the pawn at c5. > >Uri Hi, after 41. Bd8? Bc6! black can reach the following position: [D] 3B4/8/p1b3p1/1pP3P1/1P2K3/5p2/5K2/8 b and then play 58... Kf4. As you noted, the bishop moves lose, and if 59. Kf1 then black replies Ke3 and wins. Without the white pawn at c5, white can expel the black king with Bb6+ Since the losing variations involve a deep Zugzwang, this must be a really hard nut to crack for computers (it is also difficult for humans) José.
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