A set piece is a restart such as a corner, free kick, or throw-in that gives a team an opportunity to organize a planned action. Penalties are also set pieces, although analysis often separates them from other restarts.
What to watch
Look beyond the delivery. Starting positions, decoy runs, marking assignments, and the players protecting against a counterattack all shape the outcome. The first contact and the next phase deserve separate attention.
An illustrative example
At a corner, one attacker moves toward the near post while another attacks the space behind. The movement can create separation, but the delivery still has to reach a playable area.
Avoid this mistake
A goal following a restart is not always classified as a set-piece goal by every provider. State how many subsequent actions your definition includes.