Author: Heiner Marxen
Date: 21:56:45 04/28/01
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On April 27, 2001 at 21:58:22, leonid wrote: >On April 27, 2001 at 19:28:41, leonid wrote: > >>On April 27, 2001 at 18:44:32, Mike S. wrote: >> >>>On April 27, 2001 at 08:28:44, leonid wrote: >>> >>>>(...) >>>>[D]4nqqQ/1r2qR1Q/2q1NBQN/q3n1PK/kr1qn1RQ/4RBq1/5NpN/3bb2R b - - >>> >>>Black has the move? >> >>Yes. >> >>>Please tell at least how many moves the mate takes, to allow an estimation of >>>the calculation time required. >> >>I really don't know exact minimum amount of moves for this position and expect >>that somebody will come with response. I had too bad branching factor when I >>tried to solve it in perfect way. As a result, I saw this position by brute >>force only 6 moves deep (already 23 min). In 6 moves for sure no mate. And in 10 >>- mate was found by my selective search. Shortest mate exist without any doubt >>between 7 and 10 moves. Chest on a K7/600 with 350 MB hash does not find a mate in 8 in nearly 3 hours. Since the effective branching factor is around 20, I give up, here. For the "no mate in 6" Chest used only 34 seconds. Cheers, Heiner >Will just add, maybe this could help, that mate that my solver found started >with move g3-h4. > > >>Cheers, >>Leonid. >> >>>With white to move, I didn't find a #5, using Mate 2.0 with standard options. >>> >>>Regards, >>>M.Scheidl
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