Author: leonid
Date: 03:57:16 10/15/99
Go up one level in this thread
On October 15, 1999 at 04:10:28, blass uri wrote: >On October 14, 1999 at 18:45:25, leonid wrote: > >>On October 14, 1999 at 15:17:31, Jeremiah Penery wrote: >> >>>On October 14, 1999 at 14:41:11, leonid wrote: >>> >>>>On October 14, 1999 at 09:40:23, Jeroen van Dorp wrote: >>>> >>>>>It's a time setting. >>>>>After Hiarcs reaches the number of plies that are indicated here it will do it's >>>>>move. >>>>>BTW a ply is a half move (move white or move black). So fixed depth 6 plies >>>>>means that after calculating all possible moves for 6 plies (3 moves) Hiarcs >>>>>will execute the best move he found up to that time. >>>>> >>>>>Makes it e.g. weaker in the endgame. >>>>> >>>>>Jeroen ;-} >>>> >>>>But are you sure about this? Could Hiarcs, even if you indicated >>>>"fixed depth", go more deeply to see for so called "extensions"? >>> >>>Yes. All programs do some kind of extensions, so that a 6-ply search is really >>>more than 6-ply much of the time. >>> >>>Jeremiah >> >>So, maybe, here we are in a paradox situation. From one side we are in the >>game that presumably goes after stric and clear logic, and in the same >>time we see the usage in it simple human words in the most obscure and >>unexpected way. Why it is so? > >I do not see the avsurd. > >Fixed depth of 6 plies does not say no extensions. >It says only that the brute force depth is 6 plies. > >If you want to generate programs with no extensions you need to generate >different programs. > >I do not see the logic of searhing with no extension. > >Programs usually stop only in quiet positions and not in positions when both >sides can capture because you cannot trust static evaluation in this positions. > >Uri To me seeing the positions with "extention" is some kind of trick where you say one thing and do the next. You say that you see the position at fixed depth but goes that the next few plys if this suit you. This kind of talking is more commum in politics that in logic. Or think about some kind of position where you search for mate. Logic should find the mate at 8 plys (you said to it to do so by indicating search by brute force) but it can go anyway few plys deeper. You will be never able to say for sure what finally you find. Leonid.
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