Defending

Each defender is assigned a specific attacker to follow wherever they go, rather than defending a zone. Old-school but still used in certain situations, especially at set pieces. The problem: if your man drags you out of position, you create gaps. Zonal marking largely replaced it, but some managers still use man-to-man systems or hybrid approaches.

How close together a team stays when defending. A compact shape has small gaps between players and lines, making it hard for opponents to play through. When compactness breaks down - players drift, lines stretch - holes appear. Analytics can measure it by tracking the distance between the deepest defender and highest attacker, or the space between lines. Staying compact requires discipline and fitness.

A one-on-one contest for the ball between two players. Duels get split into aerial duels (headers) and ground duels (tackles, physical challenges). Duel success rate is a key metric for defenders and midfielders - it shows how often they win individual battles. Some leagues track them obsessively, and certain players like Casemiro and Van Dijk dominate these numbers.

Deliberately stepping up as a defensive unit just before a pass to catch attackers offside. Risky because mistiming leaves attackers through on goal. Requires the whole back line to move together on the same cue. Some teams use it constantly; others avoid it because one mistake is catastrophic. VAR has made tight offside calls more reliable, which should help traps, but marginal decisions still create controversy.

Positioning to help a teammate who's engaging the ball, ready to step in if they get beaten. The covering player provides insurance - if the first defender fails, the covering defender should be there. Good teams have layers of cover; poor teams have gaps. Centre-back partnerships are built on trust that your partner will cover you when you step out to press.

The imaginary line connecting the back defenders, which determines the offside position for attackers. A flat line is easier to hold but harder to adjust; a staggered line offers cover but can create gaps. The defensive line moves up and down as a unit - holding the line is essential for the offside trap. Calling the line, stepping up, and dropping together requires constant communication.

Sprinting back to help defensively after being caught up the pitch. Full-backs who've pushed forward, midfielders who've joined an attack, strikers who lose the ball - they all need to make recovery runs. The best players do it without thinking, even when tired. Recovery runs prevent counters and show commitment. Players who don't make them become defensive liabilities.

Staying on your feet and delaying an attacker rather than diving in. You shuffle sideways, stay balanced, and show them where you want them to go (usually toward the sideline or a supporting defender). The goal is to slow them down and wait for help or for them to make a mistake. Diving in risks getting beaten and leaving space behind you.

The side of the pitch away from the ball. While the defense shifts ball side, the weak side becomes less defended. Quick switches of play exploit this - ping the ball across and suddenly the weak side attacker has space. Teams balance numbers to prevent getting caught, but there's always a trade-off between compactness ball side and coverage on the weak side.

The side of the pitch where the ball is. When defending, you want more players ball side than away from it, since that's where the danger is. "Getting ball side" means positioning yourself between your opponent and the ball. Defenders who stay ball side cut off passing lanes; those who get caught wrong side get played in behind and face danger from fast attackers.