I would agree that visualizing "impossible moves" is often a good idea. As in moving your queen to a square that seems to be controlled by a knight, you might find that when you visualize the knight capturing the queen, an opportunity arises in the position that wasn't there before. If we are talking about forcing moves, then indeed it makes sense to consider absolutely all of them at least on most moves. Non-forcing though I think it's too extreme to insist on always looking at all of them.
If You Could Do it All Over Again (or are learning now)
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Sure, forcing moves are always worth considering. When calculating, I challenge myself to find all the forcing moves of those future positions, and I really hate it when I completely miss one or more.
But I definitely don't look at all legal moves. In fact I attribute my last rating improvement to consciously making the effort to ignore "bad" moves and spend more time on moves that "make sense." (Although as I said above I worry about becomming too dogmatic or something similar).
"I tihnk i evaluate something like 200 positions a second. "
I'm sorry, but I believe you made a typo.
"In fact I attribute my last rating improvement to consciously making the effort to ignore "bad" moves and spend more time on moves that "make sense." (Although as I said above I worry about becomming too dogmatic or something similar)."
Yes, same here for me actually. I think for most people they assume too much, but I think I'm one of those rare people who have the opposite habit of challenging too many basic assumptions :)
"In fact after reading that book my performance honestly dropped like 200 points and i didnt improve again until i realized that i was restricting my play too much because of that darn book."
What's interesting is that Silman himself believed that people who read his book would at first get worse -- he wrote it somewhere in the 3rd edition. There are great ideas in his book, but trying to make use of them is not necessarily easy at first. And again, one will soon learn you can't take his thinking technique literally.