Author: Dann Corbit
Date: 15:50:51 02/12/01
Go up one level in this thread
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. 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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