Author: F. Huber
Date: 11:04:27 05/22/05
Go up one level in this thread
On May 22, 2005 at 12:51:04, David Dahlem wrote: >On May 22, 2005 at 12:43:15, F. Huber wrote: > >>On May 22, 2005 at 12:08:32, David Dahlem wrote: >> >>>On May 22, 2005 at 03:51:47, Kurt Utzinger wrote: >>> >>>>On May 21, 2005 at 10:54:12, David Dahlem wrote: >>>> >>>>>What's the shortest forced mate from this position, and can any engine find it >>>>>without tablebases? >>>>> >>>>>[D]2KB4/1P6/2k5/8/8/8/7b/8 w - - 0 1 >>>>> >>>>>Regards >>>>>Dave >>>> >>>> No engine (excluding mate searchers) will be able >>>> to find the mate in 27 withouth EGTB. >>>> Kurt >>> >>>Thanks Kurt >>> >>>Why is this so difficult for engines? White Queens the pawn on move 13, and the >>>rest is easy. :-) >>> >>>Regards >>>Dave >> >>Hi Dave, >> >>do you have an idea how many moves of the bishops (and kings) are possible >>within these first 13 moves (=26 plies!) ??? >> >>I´m sure you have ... ;-) >> >>Regards, >>Franz. > >Hi Franz > >I understand what you're saying, but with only 5 pieces, it seems that depth of >26 plies should be reached in a reasonable time. And to say no engine can ever >do it, even if given enough time? > >Regards >Dave Well, then let´s calculate a bit: ;-) A bishop in the center of the board has a maximum of 13 moves, so for 26 plies there are about 13^26 possibilities! Of course there are lots of move transpositions, but nevertheless more than enough to ´think about´ for an engine ... Regards, Franz.
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