Author: walter irvin
Date: 04:14:37 07/10/99
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On July 09, 1999 at 19:39:42, Laurence Chen wrote: >That some other guy was Tigran Petrosian.... Show some respect, he was also a >World Champion.... >Also post the EPD position.... >Laurence > if the year was 1972 that some other guy was bobby fischer not tigran petrosian i believe there match was 1969 . >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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