Author: Steve Coladonato
Date: 08:02:28 02/24/00
Given a position, let's say at move 19 for white, the computer program will evaluate it and return either a numeric or symbolic evaluation and a variation that is considered best for both sides. Also, let's say that at the position for the next to last move in the variation that is returned, say move 22 for white, that in actuality four ply beyond that, move 26 for white, there is a refutation of the complete variation. The outcome being that the suggested variation is not good at all. This would probably be discovered at move 21 for white, but in the interim, the player is being directed down a bad line. Given all that, my question is does this really happen in an evaluation of a position and if so, how is it handled? I can understand that if the program "learns" that it probably would not choose this variation again. But even then how far back does it need to go to correct the line? Please disregard errors in the ply count. Steve
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