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Subject: Re: Basics of Group Theory for Chess Players ( ca 800 words )

Author: chandler yergin

Date: 01:11:28 05/22/05

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On May 20, 2005 at 16:43:35, Michael Yee wrote:

>On May 20, 2005 at 13:24:29, chandler yergin wrote:
>
>>On May 20, 2005 at 12:26:50, E. Nielsen wrote:
>>
>>>On May 20, 2005 at 12:04:52, chandler yergin wrote:
>>>
>>>>Each move and its response is called a ply.

For a specific instance only, as I noted.


>>>
>>>NO!!! There are two plies per move. :)
>>
>>As I said.. a move and it's response is one Ply;
>>a single Move is 1/2 Ply.
>>Sorry if that's too difficult for you.
>
>Actually, I also think there are 2 plies per move (or, equivalently, a ply is a
>half-move).

I agree..

>
>From the FEN description in the PGN standard:
>
>http://www.very-best.de/pgn-spec.htm
>
>16.1.8 Halfmove clock
>
>The fifth field is a nonnegative integer representing the halfmove clock. This
>number is the count of halfmoves (or ply) since the last pawn advance or
>capturing move. This value is used for the fifty move draw rule.
>
>Or look at the last section here:
>
>http://www.brucemo.com/compchess/programming/minmax.htm
>
>A 1-ply search just means all the positions resulting from one (half)move from
>the initial position.
>
>Michael
>
>>>
>>>
>>>as seen in the post by Bruce Moreland
>>>
>>>>can be solved in 40 moves (80 plies)...
>>>
>>>
>>>Regards,
>>>Eyðun



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