Author: Roy Eassa
Date: 13:42:01 12/06/02
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On December 02, 2002 at 18:01:00, Bob Durrett wrote: > >Fritz will display second best, third best, etc. moves and give a line for each. > But the Fritz manual says doing so requires extra computation when compared to >calculating only one move and displaying a line for it. > >I do not know what other chess-playing programs have to offer insofar as display >of alternate moves with there lines is concerned. > >A few questions: > >(1) If other programs offer this same feature, how do these chess engines >produce the alternate moves and lines? Differently from the way the first move >and it's line is produced? > >(2) If a chess-playing program were optimized to display multiple lines, would >the search algorithms and position evaluation code be any different from those >of a chess engine optimized for one move [and it's line] only? > >(3) If an engine is not optimized for this application, how much will the engine >performance be handicapped if it is forced to display alternate moves and their >lines? > >There may not be any simple answers to these questions? : ( > >My motive for asking these questions is obtain preliminary information which I >might use for an idea, having to do with trees of "best move sequences," I would >like to think more about. > >Bob D. I wonder if it can display *some* information about alternate lines at almost no cost... Clearly, showing the PV and the score for each alternate line costs a lot. But what if it just showed whatever it already had on hand? It should have *at least* a 2nd-best and 3rd-best (etc.) first move, assuming there are alternate legal moves ... right? I think I'd willingly trade off the completeness of the current implementation for the superior performance of my proposed behavior.
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