Lesson 12 of 13
The pin
A pin holds a piece in place: if it moves away, the more valuable piece behind it is captured.
Pinned against the king
An absolutely pinned piece cannot make a move that leaves its king in check. It may sometimes move along the pin or capture the attacker. A pinned knight cannot jump away.
A relative pin
If there is no king but a queen or rook behind the pinned piece, the piece may move. It will cost you the piece behind it, though.
Try the rule yourself
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