The throw-in is the best pressing trigger in the game

A ball taken to the touchline hands the pressing side an extra defender that never gets counted in anybody's model.

Touchline. That is the trigger. Not a backward pass, not a heavy first touch, not a particular player receiving on his weak side, though all of those get more attention on a whiteboard.

The mechanism is geometric and it is almost embarrassingly simple. A player receiving in the middle of the pitch has passing options through three hundred and sixty degrees. A player receiving a throw-in has, at best, half of that, and the defending side knows precisely where the ball will be before it is thrown, which is a piece of information no other phase of open play provides. The line is a defender that never gets tired and never gets beaten.

So the press on a throw-in can be aggressive in a way that would be reckless anywhere else. You can commit an extra body, because the ball cannot be switched behind you at speed from a standing throw. You can mark tightly and goalside, because a player pinned against the line cannot spin. And the thrower is out of play at the moment of the throw, so for that instant the attacking side is a man short, which is the only legal moment in football where you get a free numerical advantage without doing anything.

Teams have started to notice, and the counter has appeared too. Sides that take throws quickly, long, or backwards to a goalkeeper are refusing the trap rather than beating it, which is sensible and also an admission. What I do not see enough of is the attacking answer that actually works, which is to bring a runner from deep across the thrower so that the receiving player has support behind rather than in front. It costs a body from the build-up and most coaches will not spend it.

My stronger claim is that throw-in coaching is where the next visible gain is, on both sides of it, precisely because the phase has such a low reputation. It looks like nothing. It happens forty times a match. Nobody films it for the analysis reel.

A team that wins ten more of them a game does not look like it is doing anything at all, which is the best disguise a tactical edge can have.