Inter Milan

Italian for "door-bolt." A defensive system built around tight organization, zonal marking, and a sweeper (libero) sitting behind the back line. Inter Milan under Helenio Herrera developed it in the 1960s, using formations like 1-3-3-3 or 1-4-4-1. The plan: defend deep, stay compact, hit on the counter. Critics called it negative football, but it worked and shaped defensive thinking across Europe.