Author: leonid
Date: 16:55:47 02/12/01
Go up one level in this thread
On February 12, 2001 at 18:50:51, Dann Corbit wrote: >On February 12, 2001 at 18:40:38, Heiner Marxen wrote: > >>On February 12, 2001 at 15:47:55, leonid wrote: >> >>>On February 12, 2001 at 13:11:53, Heiner Marxen wrote: >>> >>>>On February 12, 2001 at 07:29:02, leonid wrote: >>>> >>>>>Hi! >>>>> >>>>>If you like to solve a mate, try this position: >>>>> >>>>>[D]rQ1Q1rnk/q4qbp/3nQqbB/q1Q1NnNn/5QQ1/b2Q4/1QB3Q1/1K1R3R w - - >>>>> >>>>>Please, indicate your result. >>>>> >>>>>In dispite that this position is not that deep and difficult, if your program >>>>>don't know how to deel with white crowd it could be in serious trouble. My was >>>>>deadly slow in searching for mate even by selective search. Reason - white have >>>>>142 initial moves and goes beyond 150 during the search for mate. Good challenge >>>>>for every chess program! >>>>> >>>>>Thanks for responding, >>>>>Leonid. >>>> >>>>Hmmm, not deep? Not difficult? "There is no mate in 6" by Chest burns >>>>nearly 18 minutes on a K6-3/400 with 50MB hash. I have started depth=7, >>>>but I expect at least 3 hours to complete it, and may be more. >>>>At least I can confirm the 142 initial legal moves. >>>> >>>>Heiner >>> >>>Thanks, Heiner! You are very close! Mine found mate in 8 by selective. It was >>>long. Took 1 min 17 sec. >>> >>>It is simple since there are not that many moves before the mate and starting >>>move (for 8 moves) is checking one. >>> >>>Leonid. >> >>Phew, that was hard work: after 5.3 hours (K6-3/400, 50MB hash) Chest finds >>a unique key for a mate in 7. Here is a PV: >> >>Ngxf7+ Nxf7 Nxg6+ hxg6 Bxg7+ Nfxg7 Qgxh5+ Nxh5 Qfxf6+ Ngxf6 Qdxf8+ Kh7 Qgxg6# >> >>What about the playing programs? Normally they are much faster to _find_ >>a mate. Did nobody try it, or is this one also hard for them? > >I got tired of them because you can see at a glance that they will never occur >in a game. Far more interesting to me is the solution of practical mates. What you are saying have a real sense. Only what are the real positions from real game? Mates between 3 and 5 moves. Very seldom up to 7 moves. When those mate in 7 ever happened, they were probably never annouced in advance, like computers do. Was human player actually aware of them? But position of programs is very clear. They solve instantly 3 or 5 moves mate, good for human. Those rare human 7 moves mates they usually do in less that one second. Right now we came to the point when chess program became just too smart for solving trivial human mate. Leonid. >There seems to be one or two 10 queen type mate problems posted per day. I >doubt very much if a real chess engine running games will encounter a single >such problem in a lifetime.
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