Author: Melvin S. Schwartz
Date: 16:20:50 01/29/99
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On January 29, 1999 at 18:10:02, José de Jesús García Ruvalcaba wrote: >On January 29, 1999 at 17:46:45, Melvin S. Schwartz wrote: > >>According to the manual of my Mephisto atlanta, it states: >>"The program in this chess computer normally uses a Selective Search algorithm. >>This allows the computer to see combinations that would otherwise take much >>longer to compute. Turning this option off by choosing -SEL makes the program >>switch to a powerful Brute Force algorithm. This search method minimizes the >>risk of an occasional oversight. Note: The Problem Solving Levels always use the >>Brute Force method." >>This explanation of the two types of searches would seem to me that Brute Force >>would see what Selective Search can see and more since it minimizes the risk of >>an occasional oversight. And it seems that since Selective Search is faster, it >>wouldn't go as deep as Brute Force. I know it is somewhat confusing comparing >>all to what you said. Now, can you make some sense of it knowing what the manual >>says? If the tech guy in Hong Kong is wrong, then he should be selling shoes >>instead being a technician. Seriously, I would appreciate your evaluation of >>what the manual says. >>Thank you, >>Mel > > I do not have a Mephisto Atlanta; I answer from what I have read about brute >force and selective search in general. > At the same time control, both search algorithms will see very differente >things. The brute force one will look at all the variations to about the same >depth; while the selective search will look much deeper to some variations than >others, its longest variations will be much longer that those of the brute force >method. > The selective search method risks an oversight in its less deep variations. The >brute force method wastes a lot of time in irrelevant moves. Thank you for responding. However, my real question is still not answered. Which method produces a higher chess rating. In other words, when they rate these machines; for example, the Novag Diamond 11 Swedish ELO 2220 and the Mephisto atlanta Swedish ELO 2280, which method do they use? Selective Search or Brute Force. Which method produces a higher level of chess??? Which method is better??? The manual of my Mephisto does state that Brute Force is used in the Problem Solving Levels. There must be a reason why they have designed the chess computer to operate that way. Anyone with information regardng this confusing issue would be appreciated. Thank you, Mel
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