Author: Pham Minh Tri
Date: 15:51:04 10/23/00
Go up one level in this thread
On October 23, 2000 at 08:05:26, Georg v. Zimmermann wrote: > >>>>- If I do not sort or sort move list by other criteria, could score and move >>>>results be different? >>> >>>No, you should get exactly the same scores and moves after finishing a certain >>>depth. The last move of the PV could change though in certain cases if I am >>>making no thinking mistake. >> >>First, the move can change. >>If move A and B have the same score, the one that is searched first will be >>shown as best move. If the sort changes B to be searched first that will be the >>best move. > >That would require the two moves to be considered equal at _every_ depth. I >believe that is almost impossible. Show me an example of different first PV move >after changed move ordering ( fixed depth and no tricks like disabling HT or >searching only 2 ply, or mate in 1 position :-) ) to prove me wrong ! I agree that the best move can change. For example, two move lines mate at ply=10, they have the same score MATE-10. Or if a best move line is: movea, moveb, movec, moved...movez, the other line: movec,moveb,movea,moved...movez will reach the same position and same score. And if the movec is searched first, the second line will be pv. Pham
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.