Pin
In chess, a pin occurs when an attacking piece attacks a defending piece that cannot move without exposing a more valuable defending piece on its other side.
Moving the attacking piece to bring on the pin is called pinning.
The defending piece is pinned.
You can take advantage of a piece that is pinned (and cannot move) and attack it again!
Answers
1. Bg4
2. Bg4
3. Bb5
4. Bc4
Answers
1. c4
2. Bc4
3. f4
4. g4
Puzzles but with the answer showing if you hoover over the chessboard. Please let me know if you prefer this method.