What would you call this tactic? What name would you give it?

A counterthreat, maybe? You obviously can't take the queen as Black (Bxf3? Nxc7+!), and taking the knight is also a bad idea (according to the engine, it's a long and difficult sequence after fxe6, but White is ultimately still winning due to superior piece activity and king safety. Bxe6 immediately loses a rook and allows for a bit of simplification, so that's also not a thing).

The only issue is that Black has to take the knight; because if they don't, they lose material and/or castling rights. So, maybe Zugzwang can be applied to it as well, even though Zugzwang in the middlegame is generally considered to be impossible.

Edit: That's probably not how Zugzwang works, actually. Black would definitely rather not pass their turn here, so I guess I got that a bit wrong.

the andyclifton?

going through a quick analysis (mine, not an engine, so basic skill), it seems white is in a better position no matter the response from black. and, some sequences are forced moves for black, so white is in control.

getting back to the name, i don't think there needs to be a name for this. it's just a good move.

It needs not being a single category.

By the way, is 14.Nxe6 better than the pseudo-Queen sac 15.Qxd5? Both look devastating to me.

They are both fairly strong, but in the Queen Sac line some of Black's replies weren't forced.

fxg5, for example.

The Nxe6 line looks FORCED.

John Cena Triple Dropkick tactic!

I would call it “F Around and find out!!”

Hi, I'm just passing by but I'm not understanding why black would not take the first knight (in d5) with the pawn, the engine says it is actually the best move. Could you explain maybe @blueemu ?

The game was played OTB more than thirty years ago,.

My opponent didn't follow computer lines because there WEREN'T any home computers back then. No internet either. It was a different world.

He was deterred by lines like this one:

@blueemu I'm not saying that the opponent should have done this because the engine says it's the best move. I'm saying this seems like a perfectly natural move and without drawbacks at first sight, and not being an expert, I checked the engine to understand if taking with the pawn was actually a bad move but the engine confirmed it wasn't. Even with the line you're showing the opponent still is up the exchange even though piece activity is better for white. I'm not seeing clearly how this warrants not taking the knight with the pawn. Even so, I'm not at that level of play you're showcasing here, so I guess some things elude me still.
Thanks for your answer in any case

The line that I showed ends with Black's Rook on h8 and his pinned Knight on e5 both forked by the White Queen on f6.

If instead Black captures on e4 (the side-line that I showed on move 13) then the Black Rook on a8 and the Black Bishop on e7 both under attack by White's Queen.

Either way, Black ends up DOWN in material... not up.