Author: chandler yergin
Date: 15:25:30 05/20/05
Go up one level in this thread
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. >>> >>>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). How do you make a half move? You either make a move or you don't. As I said... and please try and get this. "For Analysis" Purposes; Chessbase considers one move and it's response to be ONE PLY! That's the way the Analysis module works! It evaluates 'every' possible move in any given position and ranks them according to the 'best' move first. It evaluates them 1/2 Ply at a time, which is one iteration. For interesting moves.. the selective search goes deeper. If you have a position where there are 20 'possible' moves, the Program evaluates 20 simultaneous PV's and ranks them according to the best PV first. You only see one, because you are only 'Scrolling' the Main PV. Using Multiple lines, you can see every PV and how the Program evaluates it. If you have an endgame position where the King for example only has 4 possible moves, the Program only evaluates 4 PV's. These are separate and distinct PV's. If the Program indicates it has searched to a depth of 8 Ply, you will see 4 moves for White & Black that are scrolled. As it reaches a depth of 10 Ply, you will see 5 complete moves for each side scrolled. I don't know how to make this any simpler. Increase the size of the analysis window, and you can see what the engine is doing. > >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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