Author: Mark Ryan
Date: 17:36:11 07/09/99
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Okay, okay, I must remember to use a smiley :-) when saying irreverent things like "some other guy". Also, I must apologize that I cannot post the position as I am at work and all my chess stuff is at home - - obviously I should have approached this more thoughtfully. However, if you wish to examine the game, it is on any serious database: World Championship 1972, Game One, Spassky-Fischer. RESPECTFULLY :-) Mark On July 09, 1999 at 20:12:19, John Hartmann wrote: >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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