Zonal Progression and Packing: definition and limits

Dividing the pitch into zones turns progression into a map rather than a total. Packing adds an idea from another sport: count the opponents a pass takes out of the game.

Why zones

A single progression total cannot describe where a team advanced the ball. Two sides with identical figures may have progressed through the wings or through the centre, and those are entirely different attacking methods. Zoning the pitch restores the geography that the total discards.

The most common division distinguishes the wide channels from the two half-spaces and the central corridor, and splits the pitch lengthwise into defensive, middle and attacking thirds. Nine zones or eighteen, the principle is the same: progress through the middle is more dangerous than progress down the touchline, and the map shows which one happened.

Half-spaces

The half-space is the channel between the centre of the pitch and the touchline, and it has become the standard reference point for describing modern attacking shape. A player receiving there can pass in three directions, has room to carry inside and can shoot from a good angle, which is why so much progression is designed to end there.

Zonal analysis makes this visible. A team whose progressive passes concentrate in the half-spaces is attacking through the most productive corridor; one whose progression is almost entirely wide is delivering crosses from positions that convert at a much lower rate, and the map explains the difference in output.

Packing rate

Packing counts how many opponents a pass takes out of the play, measured by the number of defenders between the ball's starting point and its destination. A pass that goes past four opponents has a higher packing value than one that goes past one, irrespective of the distance covered.

The metric has a specific virtue: it captures the value of a short pass that removes several defenders at once, which neither distance nor zone change measures well. A five-metre pass through a crowded midfield can have a larger packing value than a forty-metre switch, and the model is designed to say so.

Where the approach is thin

Zonal analysis assumes that the value of progress is a function of position alone, which ignores the state of the defence at the moment the ball arrives. A player receiving in the half-space with two defenders closing is in a different situation from one receiving there in space, and the zone map records both identically.

Packing has its own weakness: taking opponents out of the play is valuable only if the receiver can exploit the space it created. A pass that removes four defenders and reaches a player who then passes backwards has produced a large packing value and no threat, and the metric has no way to notice the anticlimax.

Reading a zone map

A zone map is read in two directions. Across the pitch it shows the corridor a team prefers; along its length it shows how high the team progressed. The combination is a description of attacking method that can be stated in a sentence, which is more than can be said of a progression total.

Comparing two maps side by side is one of the more informative things analytics can do with modest data, because it needs no tracking and no model. It requires only coordinates and a decision about how many zones to draw, and it survives the definitional disputes that plague rate metrics.

Practical presentation

The most useful table for this material lists each zone with the number of progressive actions into it, the number attempted and the success rate. That triple distinguishes a team that attacks through the half-spaces constantly from one that does so rarely but reliably, which are different tactical facts with the same total.

Where packing is included, it belongs beside the zone data rather than instead of it, because the two measure different things: one describes where the ball went, and the other how many defenders it went past on the way.

Key reference points

• Zone maps restore the geography that a progression total discards.
• Progress through half-spaces is worth more than progress down the touchline.
• Packing counts the defenders a pass removes from the play.
• Zonal analysis ignores the state of the defence at the moment of receipt.
• Packing values actions that nobody exploits, so it must be paired with threat.
• Zone maps need only coordinates and survive definitional disputes.

Progression totals say how far the ball moved; zone maps and packing say through which doors and past how many defenders, which is the part that decides whether it mattered.