It's like... hmm, I don't know how to say it.
It's like very clearly defining what the threat is in your mind... and after you know exactly what it is, it really focuses your calculation and frees up your thinking. Instead of being a murky mess, the tactic becomes very distinct and exact.
What I mean is, you're aware of more options, but at the same time, you don't waste time calculating things that don't work.
Let me try to make up a position as an example. First how I expect most lower rated players to play it:
Ok, so what was missed?
I used a capture as a "threat" because that's pretty much the most basic thing (also trying to come up with an example is hard, so I went with the most basic thing I could do).
And earlier when I said options, hopefully it's more clear now.
If your opponent threatens a piece, you can play any move that threatens something of equal (or greater) value.
If your opponent has a 3 move combo threatening your queen, then you wont waste any time calculating anything that doesn't threaten checkmate, or their queen (or queening a pawn, you get the idea). So at the same time you're aware of more options, but also you're ignoring options that definitely don't work.
Maybe another difference is tactics that come at the END of a sequence, not the beginning.
For example (below)
(It's hard to make up a good one on the spot so just bear with me)
I would like to lay out an idea I've been considering lately, and see if anyone agrees or disagrees or can help me extend it and develop it. The genesis of the idea is that as I've stayed above 1400 blitz for a while now, where before I was often dipping below 1300, I can note some specific differences in my play. And here is a sort of list of where I think play is focused by level, as far as I can go. But I'm wondering if anyone would care to extend it further:
~800ish: Main questions involve things like "did you hang a piece or did you give up a mate in one?" and then "did your opponent hang a piece or did your opponent give up a mate in one?" These happen multiple times per game at this level. If you never hung a piece, and never missed when your opponent did, you could not have this rating.
~1000ish: Pieces are still hung, but main questions start to be "did I (or my opponent) only guard a piece once when it needed twice?" or "can I fork him (or can he fork me)?"
~1200ish: Additional questions start to be along the lines of "can I use a pin or a discovered check to make a piece unguarded, or forkable, or whatever (or can my opponent do it)?"
~1400ish: Here, which is where I now am, I am finding things to be different from before. Though again you can still do piece winning tactics, I find a lot more that I'm saying "I will trade knight for knight, equally, because it opens the long diagonal which I control and you have no way to oppose that control" or in the same sense "because it will open a file that leads to your king and you don't have sufficient defense there." And this seems to me to be quite different from how I used to think.
So, if anyone agrees with any of that, what happens at 1600, or 1800, or beyond?