Author: Laurence Chen
Date: 16:39:42 07/09/99
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That some other guy was Tigran Petrosian.... Show some respect, he was also a World Champion.... Also post the EPD position.... Laurence On July 09, 1999 at 18:21:07, Mark Ryan wrote: >Fritz 5.16 Autoanalysis and Blundercheck fail to detect a bad move in a famous >position (details below). Using backward analysis, starting by evaluating the >final game position and then working back through the preceding moves, Fritz >does not remember its evaluations from move to move; it analyzes each move >without reference to its evaluation of the following move. Therefore: > >1. What is the point of backward analysis? It seems to be no different from >on-the-spot position analysis. > >2. Are there any programs that use backward analysis "correctly"? That is, do >any programs evaluate the final position first, then analyze the preceding moves >using the knowledge that they have gained? > >Example: World Championship 1972, Game One, in which the white pieces were >handled by the brilliant World Champion Boris Spassky, and the black pieces were >handled by some other guy. Fritz correctly evaluates White as being ahead all >the way back from the final move to move 30, at which point it sees that black's >bishop is doomed. However, when Fritz moves back to move 29, it forgets this >knowledge, and it does not see that the bishop is trapped; so it incorrectly >evaluates the position.
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