Author: Don Dailey
Date: 11:01:13 12/07/97
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On December 07, 1997 at 13:41:03, Jari Huikari wrote: >On December 07, 1997 at 13:14:54, Don Dailey wrote: > >>>Could you tell me what is the maximum number of legal moves in a >>>chess game position? >>>A) In theory? >>>B) In practice? > > >>I don't believe this is known. It might be fun to make a contest >>out of this though. Can somone post a position with a high number >>of legal moves? And the rest of us will try to better this? > >>The rules are: > >>1) Must be a fully legal position, (no more than 9 queens for >>instance.) >>2) Post in FEN. > >I think that some chess programmers must have thought this question some >time. > >I remember a 'mate in one'-position having 175 or so legal moves. Over >100 >of them were mates. > >Perhaps someone has statistics from 'real' games. BTW: What's the >average >number of moves precisely? I know it's about 30, maybe a little more. >(In >middlegame anyhow.) >I already know, that minimum is zero (in mate or stalemate. :-) > >(I _may_ have some use for these information in my new program.) > > Jari I'm using my program to search for NORMAL positions with lots of legal moves. I'm sure I can do much better but to kick this off, can someone beat 65? I know it's possible to find positions with over 100. Pehaps some modification of the 8 queens solution will give us a nice lower bound on the most "complicated" position. Don 3r2k1/1p3ppp/p4P2/P3r3/1P3nPP/5RQ1/2q5/R6K b - - ; 65 legal moves. P.S. I haven't checked this for accuracy yet. Don
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