Under the left-winglock, which Detroit made famous and still uses a little bit, the left wing is designated as a defensive player. Google
The left-winglock was a defensive scheme popularized by coach Scotty Bowman and Detroit in the mid-90s. Google
By the early 1990s, principles of team defence and rigid play-it-safe systems, like the left-winglock and neutral-zone trap, have taken over the game. Google