At halftime, a possession breakdown map shows which player in which zone lost the ball, and how: pressured pass failure, unpressured pass failure, dribble failure, header loss, or carry turnover. Unpressured failures are particularly diagnostic — losing the ball without being pressed suggests decision errors or technical failures, not just defensive pressure. This produces a targeted clip list for the coach to review with players before the second half.
Build by: (1) filter to all possession-ending events in the first half; (2) categorize by action type (pass, dribble, header, carry, control) and whether under pressure; (3) plot on pitch zone; (4) group by responsible player. Present to coach as: "In zone X, these 3 players lost possession these ways — here are the clips." Prioritize unpressured failures as higher-priority coaching points (no excuse of defensive pressure). Volume of breakdowns in a single zone indicates a systemic problem; isolated breakdowns may be individual.
A possession that ends with a turnover in zone X tells you the outcome. The breakdown POINT — where in the chain the possession deviated from the game model's intended sequence — tells you the cause. These are often different: the turnover may happen in the final third, but the breakdown was a missed pressing trigger in midfield that forced a long ball, which was won but led to a rushed attack. Diagnosing at the breakdown point rather than the failure point changes the coaching intervention entirely.