Author: Terry McCracken
Date: 20:51:11 02/09/06
Go up one level in this thread
On February 09, 2006 at 20:24:32, Robin Smith wrote: >On February 09, 2006 at 20:02:55, Mark Ryan wrote: > >>On February 09, 2006 at 19:41:26, Steve Maughan wrote: >> >>>Terry, >>> >>>>It is a trivial win, the Black King _cannot_ get access to a8, it's too far >>>>away and the White King would never allow it. >>> >>>Take a look at this variation >>> >>>[Event "5 Minutes/Game + 1 Seconds/Move"] >>>[Site "Engine Match"] >>>[Date "2006.02.09"] >>>[Round "1"] >>>[White "Shredder 9 UCI"] >>>[Black "Spike 1.1"] >>>[Result "*"] >>>[SetUp "1"] >>>[FEN "2r5/2pR1pk1/p1P3p1/P2K4/5P1p/5P1P/8/8 w - -"] >>> >>>1. Rxc7 Rxc7 2. Kd6 Rc8 3. Kd7 Rh8 4. c7 Kf6 5. c8=Q Rxc8 >>>6. Kxc8 Ke6 7. Kb7 Kd7 8. Kxa6 Kc7 * >>> >>>As far as I can see, the white king is trapped between a6 and a8, so it must >>>give up control of the a8 corner, force black's king to capture the 'a' pawn and >>>go on a pawn hunt on the king-side. >>> >>>Am I missing something? >>> >>>Steve >> >>Hi, Steve: >> >>Isn't 8...Kc6 even better? How does White win? >> >>Mark > >Hi Mark, > >8... Kc6 9.f5 gxf5 10.f4 f6 11.Ka7 Kc7 12.a6 Kc8 13.Kb6 Kb8 14.Kc6 Ka7 15.Kd6 >Kxa6 16.Ke6 +- > >-Robin Thanks Robin, this explains why programs may switch to 1.f5??, the depth of search is enormous for computers. You helped solve this mystery! I should have spent more time looking at all Black defences. Terry
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