Author: Komputer Korner
Date: 06:34:58 07/31/98
Go up one level in this thread
On July 27, 1998 at 07:13:49, Moritz Berger wrote: >On July 27, 1998 at 06:25:55, Don Dailey wrote: > >>On July 27, 1998 at 02:03:33, Moritz Berger wrote: >> >>>On July 26, 1998 at 23:37:23, Mark Young wrote: >>> >>>>I think it is wrong for people to think >>>>fritz 5 is best at fast time controls. I found the program much stronger at >>>>slower time controls. >> >>Don't all programs play much stronger at slower time controls? The >>question is does Fritz improve more at slower time controls than >>Junior, the program in question. It wouldn't suprise me if you >>were right on this however. Each ply of search does A LOT to improve >>your chess, and this doesn't just apply to tactics as many people seem >>to think. >> >> >>> >>>I subscribe to this statement. Fritz plays best at 40/120 where search depth >>>often compensates for positional misevaluations (that can be observed in all >>>chess programs). One striking example was a French game I played a year ago >>>(Fritz was black) where Fritz wanted to blunder away the game by opening the >>>position against itself - only at the last ply (which was 12 or 13 AFAIR on my >>>P166) it always so the refutation after a couple of minutes and finally went >>>ahead and won the game. >>> >>>Moritz > >The point is that knowledge in most programs doesn't consist of exact plans but >of mere rules of thumb that are correct only most of the time (as the authors >certainly hope). Some people confuse rules of thumb with real understanding when >there is a huge grey area of uncertainity. > >The deeper you search, the more likely it is that an "exact" search will >outperform "fuzzy" knowledge with a shallower search. The key is being smart at >pruning the search tree and being selective enough to get that extra plys (one >ply won't be enough). Fritz is not only very fast (lean evaluation) but also >very much selective in its search which I consider to be a different approach of >implicit "pruning knowledge". It usually gets 2-4 ply deeper than others in >middlegame positions which often neutralises the "knowledge" in the statical >(more expensive) evaluations of other programs (that might be worth 2-4 ply as >well from a positional point of view but doesn't give them the 2-4 tactical >plies Fritz gets). The big problem is how to implement strategical plans - I >believe that most programs just survive as long as there is some tangible >positional shift within their search horizon. Statical knowledge is insufficient >to give a good enough representation of the reality on the chessboard to work >with e.g. a 1 ply search and win against strong opponents. 40 ply plans are >still more likely to emerge from the experience and intuition of the very best >human Grandmasters. > >Junior and The King are very successful by (as far as I understand it) not >pruning the entire search tree but using all kind of extensions on top of a >shallower search. > >Please note that I don't claim to know for certain that these programs work that >way, it could be very different in reality but this is how I perceive how they >work. > >Moritz I believe that Fritz 5 is a full width searcher with an excellent null move algorithm. In fact the manual says it is a full width searcher. -- Komputer Korner
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