Author: Michael Yee
Date: 15:40:28 05/20/05
Go up one level in this thread
On May 20, 2005 at 18:25:30, chandler yergin wrote: >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? Here's a halfmove: 1. e4 And here's the other half: 1... e5 The move number (for the game) didn't change. I guess it's just a matter of definitions, though. Of course each of the "moves" is a "move" in the chess sense. But in a computer chess sense, I think most people/programmers label "1. e4" as a ply. Or even just depth 1. Maybe you're right about chessbase's analysis module (which I don't have). But if so, then I think their definition isn't the most widely accepted one. Also, here is something google turned up (not that this whole topic is too important): http://www.chessbaseusa.com/T-NOTES/082299.htm "Remember that a ply is a half-move (that is, one move made by one player)." Michael >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
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.