To understand this, you actually need to know how an engine works, which is not that easy.
Bottom line, fritz has been known to consider winning positions losing, but then change its mind after a few minutes.
Computer analyze different
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So I've noticed that (in my case, Fritz) my computer can analyze a position say +1.3 but after I do the best move according to the analyze, the position changes to +1.7. I do not get it;
Does the value showing how the position is valued after the last calcualted move in the move serie? If so, then the value should not change, right?
Could someone please explain to me what the values are an evaluation of ? I know a bit of how the computer evaluates, so note that it is not my question about how the computer calculates these number.