In chess, a PIN, occurs when an attacking piece attacks an enemy piece in which the defending enemy piece cannot move without exposing another valuable (often more valuable) defending piece on its other side to be capture by initial the attacking piece!
Bishops (and rooks and queens) are great at pinning.
Now it’s time to practice! Visualize using your mind. White to move and win in 1.
Answers are in the next section.
Answers:
Bd5 (example)
Bg4
Bc4
Bc6
Bd5
Bd5+
Bd5+
Bd3+