Author: John Hartmann
Date: 17:12:19 07/09/99
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Umm, if it's really 1972 he's talking about, the other guy is Fischer, not Petrosian. But he should show some respect anyway. Fritz is only silicon, after all... john 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 > >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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