Author: Ernst A. Heinz
Date: 02:15:05 06/26/98
Go up one level in this thread
On June 25, 1998 at 16:18:29, Robert Hyatt wrote: >On June 25, 1998 at 14:04:47, Johanes Suhardjo wrote: >>>On June 18, 1998 at 06:28:48, Ernst A. Heinz wrote: >>> >>>>On June 18, 1998 at 04:16:15, blass uri wrote: >>>>>On June 17, 1998 at 14:49:15, Vincent Diepeveen wrote: >>>>> >>>>>>black to move >>>>>> >>>>>>position white Kh3,Ra4,a2,f4,g3,h4 >>>>>> black Kc4,Rc3,b4,e6,f5,g6 >>>>>> black to move wins easily >>>>>> >>>>>>Believe it or not, diep managed to lost this as it didn't play Ra3, >>>>>>it played Re3. >>>>>>This is so simple, but i haven't worked at endgame yet. >>>>> >>>>>Fritz5 is not better in this position it needed more than 80 seconds >>>>>to find Ra3 is winning >>>>>before that(after 1 minute on my pentium 200MMX) it prefered Re3 >>>>>It intended to play Ra3 without seeing it is winning after some >>>>>seconds but change its mind >>>> >>>>That's really surprising because it actually is so simple. >>>> >>>>"DarkThought" fails high on 1. Ra3! in iteration #9 after less >>>>than 1 sec. > [...] > >but it's a non-trivial position to evaluate, because as black trades rooks >and goes after the a-pawn, white has some interesting threats on the other >side that make black take time out to handle them. IE ra3 Rxa3 bxa3 h4 and >black has to take time out to plzy gxh4 or the white pawn queens first and >loses. This happens in another couple of places. Would be interesting to >see how a program spots this accurately with a shallow search. It takes me >12 plies to see Ra3 is +3. If the eval is around zero, it is not clear that >a program knows what is happening. "DarkThought" seems to know what is going on because it scores Ra3 as roughly +2.5 after iteration #9. =Ernst=
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