Line-Breaking Pass Detection

A line-breaking pass is one that travels through the opponent's defensive lines (the organized rows of defenders) rather than around them or back. From a football tactics perspective, line-breaking passes are one of the most high-value actions in progression play — they force defensive reorganization, create numerical advantages, and typically lead to higher xG situations. Detecting them analytically requires: identifying the opponent's defensive line positions and computing whether the pass start and end points straddle a line.

Detection method: (1) identify the opponent's defensive lines at the moment of the pass (requires tracking data for line position, or approximate from event data using defensive player y-coordinates); (2) check if the pass origin is behind the nearest defensive line and the pass destination is ahead of it; (3) tag as a line-breaking pass. Distinguish between first-line breaking (bypassing the press), second-line breaking (bypassing the midfield block), and final-third line breaking (bypassing the defensive line into the penalty area). Each has different frequency and value implications.

1. Using only y-coordinate to detect line-breaks: Diagonal passes may straddle a defensive line without crossing it perpendicularly — use pass geometry relative to the line orientation.
2. Treating all line-breaks as equally valuable: First-line breaks in build-up have lower value than final-third line breaks into the penalty area — weight by location.