One of the most important strategies for a team is their "forecheck". Forechecking is the act of attacking the opposition in their defensive zone. Forechecking is an important part of the "dump and chase" strategy (i.e. shooting the puck into the offensive zone and then chasing after it). Each team will use their own unique system but the main ones are: 2–1–2, 1–2–2, and 1–4. The 2–1–2 is the most basic forecheck system where two forwards will go in deep and pressure the opposition's defencemen, the third forward stays high and the two defencemen stay at the blueline. The 1–2–2 is a bit more conservative system where one forward pressures the puck carrier and the other two forwards cover the oppositions' wingers, with the two defencemen staying at the blueline. The 1–4 is the most defensive forecheck system, referred to as the neutral zone trap, where one forward will apply pressure to the puck carrier around the oppositions' blueline and the other 4 players stand basically in a line by their blueline in hopes the opposition will skate into one of them. Another strategy is the left wing lock, which has two forwards pressure the puck and the left wing and the two defencemen stay at the blueline.