Author: José Carlos
Date: 13:15:39 09/24/01
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On September 24, 2001 at 16:01:49, Miguel A. Ballicora wrote: >On September 24, 2001 at 15:24:53, José Carlos wrote: > >> First, the context: >> >> Last night I finished implementing pondering for the first time. As usual, I >>chose the easyest way to begin with, until I make sure I understand everything. >> So I did it this way: after moving, I guess the opponent move (second of the >>pv), make it, and start thinking. When the opponent's move arrives, I unmake the >>guessed move, make the real move, and start thinking normally. I expected the >>program to get to the pondering depth due to the info in the hash table. >> This worked fine most of the time, but when the ponder search failed low deep, >>the research didn't go straight to that point. Instead, it chose another move at >>the begginning (because it saw the bad move in the hash table) and went >>deepening slowly. >> I was very disapointed with this behavior, but when I started playing on ICC, >>I saw a big rating increase. Actually, the explained behaviour turned out to >>work really good, as usually the program made a good move even with less depth. >> >> Now the question: >> >> Has this been tried in _normal_ search? I mean, restarting from the begginning >>after a deep fail low. >> Is this it a mistake to do what I'm doing? If so, what are the drawbacks? >> >> Thanks in advance, >> >> José C. > >I guess that in these cases Internal iterative deepening might help. If you >are not using IID (I am not, it is in my to-do list, that is why I say that I am >guessing) restarting from the beginning could be even better. That would be >like a IID all over the tree, but faster because the hashtable kept values >everywhere. Now let's wait for somebody who really knows somthing about this >answer your question :-) > >Regards, >Miguel >PS: It looks like Averno will be stronger and stronger! Bravo Jose! Thanks for your kind words. And about IID, yes I'm using it, and it works fine in most positions, at least, for me. José C.
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