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OBV
On-Ball Value
What it measures
The change in a team's expected goals produced by a single on-ball action.
The question it answers
Which individual actions move the needle?
In the Variation framework
On-Ball Value attributes the swing in expected goals to the player performing each on-ball action. It is useful for spotting the individuals who generate variation — the ones whose receptions and carries repeatedly shift the danger level rather than merely recycle possession.