How should one take advantage of the "premove" function on chess.com? Chess.com has a function called &quot;premove&quot;. When pre-moves are enabled, while it’s the opponent’s turn you can make a move to automatically be played as soon as they make their move. The premove will play automatically even your opponent does something unexpected. If your opponent's move makes your pre-move illegal (such as putting your king in check), then your pre-move will be canceled).
My question is, under what circumstance should I use the premove function? I can think of the following scenarios:

My opponent has only one legal move. In this case, if I can determine my reply to this move, I may consider making a premove.
When I am in a very safe endgame (for example, KR vs KB, where I will not lose even after blunders by my rook) and I am running out of time.
In the early opening stage of a blitz game, when my opponent has only one reasonable move and for most of his &quot;unreasonable&quot; moves, my premove is still a good reply. For example, after 1. e4 c6, 2. d4, as white I can more or less safely assume black will play 2... d5 and (pre)play 3. Nc3 before black makes his second move. Even if black played 2... g6 or 2... d6 or 2... Na6, 3. Nc3 is still a sound reply.

Why is there such a function &quot;premove&quot; in the first place? What is the &quot;best&quot; way to make the most of this function?
I think case 4: Your premove is illegal unless your opponent does something very specific but entirely expected, is the most common case that I've seen. Like you offering a trade, and regardless of what they take with (including if there is only one way they can take), there is only one specific way you want to take back.
As an example, IM and chess streamer Eric Rosen, when he gets to play the Stafford gambit as black (1. e4 e5, 2. Nf3 Nf6, 3. Nxe5), he always plays 3. ...Nc6, then premoves 4. ...dxc6. Because if that capture is legal, it must be because the white knight captured the black one, and in that case he always wants to take back with the d-pawn.
Also notable example of useful premove (and the converse of case 4, more akin to your case 2) was a drawn endgame where Carlsen had the black pieces during this his 2020 online tour (can't remember which game, or the exact piece placemens, sadly, but I believe it was KQP or KQ versus KRP). He had established a fortress and could premove his rook back and forth between two squares on the sixth rank. The only cases where such a move would lose the game were cases where performing that rook move would be illegal. He had only seconds left and no increment, so he couldn't wait and see what move his opponent would make.