Derby matches are promoted as the most dramatic fixtures of a season and frequently deliver very few goals. The gap between the billing and the football has structural causes rather than being bad luck.
The cost of losing dominates the planning
A derby defeat carries consequences that extend far beyond the points, affecting supporters, players and coaching staff for months afterwards.
Managers respond by prioritising not losing, which means a deeper defensive line, fewer players committed forward and a preference for territory over chances.
When both sides make the same calculation, the result is two compact teams occupying the same third of the pitch with nowhere to play.
Intensity suppresses technique
Derby matches are played at unusually high tempo, with pressing that starts earlier and tackles that arrive faster than in an ordinary fixture.
That pressure reduces the time available on the ball, and reduced time produces heavier touches, misplaced passes and possession changing hands constantly.
Scoring requires sustained control somewhere on the pitch, and a match in which nobody can settle rarely provides it.
Familiarity removes the element of surprise
Local rivals know each other's players, patterns and set-piece routines in detail, often having played several times a season for years.
Attacking moves that work against unfamiliar opponents are anticipated, and the runs a striker relies on are covered before he begins them.
Defenders also know which forward drifts into which channel, so the individual advantages that produce goals elsewhere are neutralised.
Discipline changes the pattern of the match
Cautions accumulate early because tackles are committed, and a booked player becomes more careful for the remaining hour.
Dismissals are more common than in ordinary fixtures, and a red card usually pushes the remaining ten players further back rather than opening the match up.
The resulting shape produces long periods of possession against a packed defence, which is one of the least productive situations in football.
Why the reputation survives anyway
The goals that do arrive in derbies are remembered far longer than goals in other matches, so the memorable moments are disproportionately available.
Tension is entertaining in itself, and a tight match with two chances can feel more dramatic than a comfortable four-goal win.
The billing therefore describes the atmosphere accurately while describing the football misleadingly, and both things can be true at once.