The coach of Djurgårdens IF, Hardy Nilsson, took the system with him and it was used extensively by the Swedish national hockey team in international competition.
[1] The system converts the traditional hockey layout of three forwards and two defensemen, into two torpedoes up front, two halfbacks, and one lone defenceman (or libero).
The torpedoes are responsible for forechecking in the corners when the puck is in the offensive zone, and stay around the neutral zone to be sprung into a scoring position (by a stretch pass or torpedo pass).
The system was originated by the Boston Bruins of the late 1950s; it was later adopted by the Chicago Blackhawks during the 1960s.
The system was used to describe the Swedish national men's hockey team's approach during the 2002 Winter Games,[3][4] which was punctuated by a preliminary 5-2 win over the eventual gold-medal winning Canadian team.