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Subject: Re: Basics of Group Theory for Chess Players A Ply

Author: Darrel Briley

Date: 01:45:57 05/25/05

Go up one level in this thread


On May 23, 2005 at 23:38:16, Robin Smith wrote:

>On May 22, 2005 at 20:40:22, chandler yergin wrote:
>
>>On May 22, 2005 at 17:44:36, David Mitchell wrote:
>>
>>>On May 22, 2005 at 06:08:42, chandler yergin wrote:
>>>
>>>>On May 22, 2005 at 05:30:44, Günther Simon wrote:
>>>>
>>>>>On May 22, 2005 at 05:22:09, chandler yergin wrote:
>>>>>
>>>>>>On May 22, 2005 at 04:41:24, chandler yergin wrote:
>>>>>>
>>>>>>>On May 20, 2005 at 22:15:59, Robin Smith 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.
>>>>>>>>>>
>>>>>>>>>>NO!!! There are two plies per move. :)
>>>>>>
>>>>>>Do you disagree with this?
>>>>>>1. e4 is a move = 1 Ply
>>>>>>2. e5 as a response is 1 move = 1 Ply
>>>>>>
>>>>>
>>>>>gosh...of course this is wrong!
>>>>>1 ply = 1 _half_move and 2 plies are 1 move,
>>>>>time to get this.
>>>>>That's why it is 1.e4 and 1...e5 ;-) (not 2...e5)
>>>>>
>>>>>Guenther
>>>>
>>>> 1. e4 e5 you consider to be one move?
>>>>For Notation purposes yes, I agree
>>>>White makes a move = 1 Ply
>>>>Black responds with a move = 1 Ply
>>>>So for each move and response = 2 Ply.
>>>>OK?
>>>
>>>Actually, you're both right!
>>>
>>>The GENERAL meaning of "move" in FIDE regs is simply "a king can not move into
>>>check", etc. One player's moving of a piece, constitutes one move. I believed
>>>that would be called a "half move", but I just went to FIDE and it's called a
>>>move, period.
>>>
>>>However, there is another meaning for more specific meaning of "move", which I
>>>can not find in the FIDE regs., but is understood by chess players to mean,
>>>oddly enough, a pair of moves.
>>>
>>>So, 1. e4 is a general move, (normally easily told apart from the specific
>>>meaning of "move" by the context), however, 1. e4, e5 is also ONE move. With the
>>>latter clearly being TWO ply.
>>>
>>>Dave
>>
>>http://www.chessbase.com/support/workshop.asp?ID=235
>
>Chandler,
>
>Thanks for making my point; from the link you quote:
>
>"The difference here is that the engine now adds a new line each time it
>completes a ply of the search; i.e. when the search depth is increased by one
>ply (half move), a new line is added to the display."
>
>QED
>
>-Robin

If there's one thing I've learned in my short time here, it's that CY is very
good at this :)



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