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Subject: Re: Computer chess vs. computer checkers and other games

Author: Russell Reagan

Date: 21:41:48 05/05/02

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On May 05, 2002 at 06:54:48, Uri Blass wrote:

>I think that there are only 32 squares and 4 kind of pieces and it means that
>5^32 is an upper bound for the number of position(a square may be empty)
>
>5^32 is only an upper bound and the number of practical positions to analyze may
>be clearly smaller.


443,748,401,247 is the number of positions in the 8-piece (or fewer) endgame
tablebases for draughts.

That number is extremely close to 441,739,287,424, which is the number of
possible positions with 8 pieces on the board (32*31*30*29*28*27*26*25), plus
the number of positions with 7 pieces on the board (32*31*30*29*28*27*26), plus
6 pieces (32*31*30*29*28*27) plus 5 pieces (32*31*30*29*28), etc.

So you can extend that to 24 man tablebases for draughts if you'd like.

Russell




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