Overlaps and underlaps

Two players, one defender, and a question that gets asked forty times a match. Your winger has the ball near the corner of their block; your full-back is arriving behind him at speed. Does he go round the outside, or through the inside?

The honest answer is that neither run is better. The run that works is the one their full-back has left open, and he can only cover one of them at a time.

When he comes inside, take the touchline

Here your #11 has carried the ball into the half-space and their right-back has followed him in. It is the right decision for the defender: the ball is inside, so he goes inside. But look at the touchline behind him. Nobody is there, and your #3 is already running.

Diagram4-3-3 vs 4-4-2

Run the same move inside him instead and it dies immediately. The underlap arrives exactly where their right-back is now standing; he is on the receiver before the ball has settled.

Diagram4-3-3 vs 4-4-2

When he holds the line, go inside him

Now the other flank, and the opposite defender. Your #7 stays on the touchline and their left-back stays with him, refusing to be beaten on the outside. The overlap is a dead end: the pass has to go past the man who is already there, and he cuts it out. The half-space between him and his centre-back, though, is a corridor nobody owns.

Diagram4-3-3 vs 4-4-2

Same runner, same distance, same pass. The only thing that changed between the two pictures is where one defender decided to stand — which is why coaches shout the run rather than name it in advance.

The run also has to be reachable

A third option exists and it is the one that makes the point: the full-back stays where he is. The winger has support, the picture looks calmer, and there is no pass to play, because the ball has nowhere to go that hurts anybody. A support run that ends short of the marked area is work without a chance at the end of it.

The model in one sentence: the opponent's shape is fixed and authored, both runs are the same length and the same pass is played at the same moment, so the only variable is the route — and the defenders turn only after the ball is played, 0.3 s later, the way a defender reacts to a pass rather than to an intention.