A forecheck is not only pressure on the puck. It is a set of routes that takes away options and forces predictable touches. When the first skater angles correctly, the second skater arrives on the next pass instead of chasing the current one.
First wave
The first forechecker aims to deny the middle lane and keep the puck on one side. A good angle turns the puck carrier into the boards and buys time for the next read. The goal is not always a steal, it is to reduce choices.
Second wave
The second forechecker reads the likely outlet and seals it early. If the puck is rimmed, the seal turns the wall into a trap. If the puck is reversed, the same read can force a hurried touch that becomes a turnover.
Adjustments
Teams can answer pressure by adding low support, using quick reverses, and moving the center deeper. The best solutions create a clean third option instead of a forced wall play. That is usually the difference between a controlled exit and a scramble.