Pinch: a tactic in which one side's long-range force (rear, car, elephant) attacks the opponent's chess piece that plays a cover role in a straight line, horizontal line or diagonal line, making it unable to move or difficult to move.

Pinning tactic is the most commonly used tactic in chess game, and it is no exception in the opening stage. Make an appointment by using one's own strength

Bind the other side's child force, make it lose its freedom of movement, and thus fall into a passive position. At this time, the party that actively contains it, in order to better play.

Function, seize the opportunity to panic in the pinned pieces, or concentrate superior forces to attack weak links.

The containment tactics include full containment, semi-containment and covert containment.

If there is a king behind the pinned piece, then it completely loses its freedom of movement, which is called total pinning.