Author: Uri Blass
Date: 13:07:04 02/19/06
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On February 19, 2006 at 15:16:13, Bahram Namjou wrote: >On February 19, 2006 at 14:14:09, Mike S. wrote: > >>On February 19, 2006 at 13:59:36, Bahram Namjou wrote: >> >>>I asked this question before but with no comments so I post it again! >>> >>> >>>when the ponder is on and chess engine thinks and evaluates a position, all of >>>the further evaluations are only based on one predicted move that considered to >>>be the opponent best next move however never this predicted move will change >>>during "thinking time" no matter this "thinking time" is 5 seconds or 50 >>>minutes...can anyone explain this why?...thanks, bn >> >>If engine (A) plays vs. engine (B) and for example plays 17.d5 expecting >>17...d5: >> >>If it ponders now, it has no information about what engine (B) is planning, >>17...d5 or maybe something else, like in a human's game: You don't know what the >>opponent will really move (except there is only one forced move) as long as he >>has not actually played his move. (A) can only calculate based on it's own >>assumption. >> >>There was an old chess computer by SciSys (Saitek) which had a "multiple" >>permanent brain, trying to prepare for several different opponent's replies. I >>think this concept remained very unique, and I consider it to be effective (or >>attractive) only in games versus humans if they use much more time than the >>chess computer. It was not very strong, compared to today's systems. >> >>That could be an interesting option for program vs. human training games though. >> >>Regards, >>M.Scheidl > >Thanks Mike...so why this feature has not been implemented in new engines? so >called "multiple permannet brain". I thought that in pondering, the engine >could evaluate similar to "infinite analysis" mode in which the best move >gradually change according to depth of play ...Right now because mostly the >predicted move is not correct, the pondering is not as efficient as we >expect...regards, Bahram Here is your mistaeke. In most cases the pondering move is correct. I agree that in case that the opponent use long time then after enough time of pondering it is better to ponder about something else but it will be a mistake to spend months of programming for better pondering that may do the engine less than 5 elo better when it is possible to get bigger improvement by better search or better evaluation. Uri
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