The act of pinning an enemy (or own) piece. It can happen directly, when the pinning piece moves to the pin-line, or indirectly, when the pinning side moves a masking unit off the pin-line.
Pinning of a piece can happen in six different ways. Firstly, there are two main categories: 1) pinning of an opponent's piece, and 2) self-pin. Former can take place in the following ways:
- directly by moving the pinning piece on a pin-line;
- indirectly by removal of an own masking piece off the pin-line.
The latter can be carried out in the following ways:
- indirect self-pin:
- by moving own king onto the pin-line;
- by removal of an own piece off the pin-line;
- direct self-pin:
- by capturing a front piece of opponent's battery aiming at own king;
- by parrying opponent's check by moving an own unit on the checking line.
See also: Unpin.