Every zone entry eventually ends the same way for whichever team doesn't have the puck: it's in the other team's zone now, and somebody has to go get it back. How a team organizes that pursuit is called forechecking, and just like the offensive systems built to beat it, forechecking comes in a handful of named structures, each with a different appetite for risk.
The most common, conservative option is the 1-2-2. A single forward, F1, pressures the puck carrier deep in the offensive zone, while the other two forwards hang back in the neutral zone rather than committing low, and both defensemen hold position near the blue line. It's a structured, patient system built to prevent odd-man rushes rather than force turnovers outright, which is exactly why it pairs so naturally with a neutral zone trap once the puck comes back up ice. One real wrinkle coaching programs teach inside the 1-2-2 is what happens when a puck battle breaks out along the boards: the nearest forward engages the puck carrier directly, one teammate covers the far side of that battle, and another covers the near side, forming a tight three-player trap sometimes taught using the shorthand of a "dog" pressuring the puck directly and a "hawk" covering the middle ice above the battle — a swarm built to win the race for a loose puck, not just chase it.
A more aggressive step up is the 2-1-2. Here, two forwards press deep together — F1 engages the puck carrier directly, while F2 reads the play and jumps on the loose puck or the nearest passing lane the instant F1 wins the battle. The third forward stays higher for support, and the defense still holds at the blue line. Because two attackers are hunting the puck at once, the 2-1-2 behaves almost like man-to-man pressure, similar in spirit to a full-court press in basketball: it's disruptive and creates real turnovers, but if the read is wrong or the forecheck simply loses the race, the defending team can be caught with only one forward back, opening the door to a dangerous rush the other way.
The most extreme version commits all three forwards deep at once, sometimes called a 3-2 forecheck — essentially swarming the puck carrier with numbers, trying to win it back through sheer pressure rather than a structured read. It's the forechecking equivalent of an all-in bet: teams reach for it when they're trailing late and simply need the puck back regardless of the cost, because if the swarm doesn't work, the opposing team is left with a clean, nearly uncontested route out of their own zone and up the ice.
None of these systems is simply "better" than the others in the abstract — they're tools matched to a situation. A team protecting a third-period lead generally wants the patient, low-risk 1-2-2. A team that's tied and has the legs to sustain pressure might lean on a 2-1-2 to generate more turnovers. A team down two goals with under five minutes left has very little use for patience at all, and reaches for the full three-man swarm because a low-risk system that plays for overtime does nothing when overtime isn't the goal. The forecheck a team chooses says as much about the score and the clock as it does about the players running it.