Author: Heiner Marxen
Date: 15:40:38 02/12/01
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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? Heiner
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