Author: Heiner Marxen
Date: 13:23:27 05/27/02
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On May 23, 2002 at 04:14:46, Uri Blass wrote: >On May 23, 2002 at 03:01:47, Matthias Gemuh wrote: > >>On May 23, 2002 at 01:34:08, Les Fernandez wrote: >> >>>I am interested to know an approximation as to how many ply current engines can >>>"most" of the time find a mate sequence (assuming it exists). ie if we know >>>there is a mate in 1 then obviously the engines will find this instantly, with >>>or without tablebases. I suspect this is probably also true for mates in 3 or 4 >>>plies also. What I am interested to know are most engines able to find mates in >>>6,7 ...... + plies. What do most of you think is a safe ply number (upper >>>limit) for current engines to find the mate without the use of tablebases? >> >> >> >>My HyLogic (150 kN/s on Athlon 1.4) finds some mates in 15 within 10 seconds. >>Programs with good extensions should find mates in 20 ... 25 !! >> >>Regards, >>Matthias. > >Yes but they can also miss shorter mates. >It may be interesting to do a competition of composing chess problems when the >target is to compose mate problems that no program can find a winning move in 3 >minutes on the hardware of today. > >The target is to compose problems when the solution is as short as possible but >inspite of it no program can find the mate. > >I guess that chest can find every mate in 4 or 5 in less than 3 minutes and I >guess that if the target is only to compose a problem that chest cannot solve in >less than 3 minutes then mate in 6 is needed. That is about right. After a short & limited search in my archives the most expensive "no mate in 5" was one of Leonids creatures: 99 secs (400 MHz). >Note that I doubt if there is a mate in 6 from practical game that chest cannot >solve in less than 3 minutes but I believe that if people works hard enough on >composing complicated legal positions they may find one that chest need more >than 3 minutes to solve mate in 6. > >If the target is to compose a problem when no program can find a winning move in >less than 3 minutes then I suspect that mate in 7 is needed. > >It is only a guess and I do not know. > >Uri IMHO it is a good guess. Cheers, Heiner
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