Black knight: pinned
What Is a Pin?
A pin in chess occurs when a long-range attacker (bishop, rook, or queen) attacks an enemy piece that cannot move without exposing a more valuable piece behind it. The pinned piece is paralyzed. The attacker has effectively removed it from the board without capturing it.
Only the three line-moving pieces can pin — knights, kings, and pawns cannot pin because their attacks don't extend through a piece. A pin always involves three pieces on the same line: the attacker, the pinned piece, and the more valuable target behind it.
Absolute Pin vs Relative Pin
Absolute Pin
An absolute pin is when the piece behind the pinned piece is the king. The pinned piece literally cannot move — moving it would expose the king to check, which is illegal. Absolute pins are the most powerful kind of pin because the rules of chess enforce the paralysis.
Example: a bishop on b5 pins a knight on c6 against the king on d7. The knight cannot move at all — any move would put the king in check, which the rules forbid.
Relative Pin
A relative pin is when the piece behind the pinned piece is something valuable but not the king — usually the queen, a rook, or a hanging piece. The pinned piece can legally move, but doing so loses material.
Example: a rook on e1 pins a bishop on e4 against the queen on e7. The bishop can legally move, but if it does, white captures the queen. The bishop is paralyzed by economics, not by rules.
How to Exploit a Pin
Once you have a piece pinned, the goal is to win it. Three main techniques:
1. Pile Up Attackers
Add more attackers to the pinned piece. A knight on c6 pinned against the king is attacked once by your bishop. Play a pawn move like d5 (or push another pawn) to attack the knight a second time. The knight can't move, so you win it for a pawn.
2. Attack the Pinned Piece Twice
A pinned piece is a sitting duck. Bring more pieces to bear on it — a knight, another bishop, a rook — until you have more attackers than defenders. Standard exchange-up.
3. Use the Pin to Set Up Other Tactics
Pins enable forks, sacrifices, and combinations. Since the pinned piece can't defend other squares, you can play moves that would otherwise be impossible. A famous motif: pin the f6 knight with a bishop on g5, then sacrifice on h7 because the knight can't recapture.
How to Escape a Pin
If your piece is pinned, you have several escape options. The right choice depends on the position:
- Block the pin. Move another piece between the pinning attacker and the target behind. Now you have an extra defender on the line.
- Capture the attacker. If the pinning piece is undefended, capture it. The pin disappears instantly.
- Move the back piece. If the king or queen behind the pin can move, get it off the line. Useful for relative pins where the back piece is mobile.
- Counter-attack. Create a bigger threat — checkmate threat, queen attack — that forces the opponent to respond to you instead of capturing the pinned piece.
- Defend with a pawn. Add a pawn defender so even if the opponent captures, you can recapture.
Classic Pin Patterns
The Pin in the Italian Game
After 1.e4 e5 2.Nf3 Nc6 3.Bc4, Black often plays 3...Bc5 or 3...Nf6. White can sometimes pin the knight on f6 with Bg5 after castling, creating long-term pressure.
The Ruy Lopez Pin
The Spanish Bishop on b5 pins the c6 knight against the queen on d8 in some variations. This pin defines the opening's strategic character — Black often plays a6 and b5 to break the pin.
The Open File Pin
Rook on an open file pinning a minor piece against the queen or rook behind. Common in middlegame positions where both sides have castled and opened files.
Spotting Pins in Your Games
Train your eye to spot pins instantly:
- Before every move, scan diagonals and files for three pieces of yours on the same line — attacker, defender, valuable piece. That's a pin waiting to happen against you.
- Look at the enemy king's diagonals and files. Any of your line-pieces that can attack a piece in front of the enemy king creates an absolute pin.
- Identify "loose" big pieces — undefended queens or rooks. Any line from one of your pieces through an enemy minor piece to that big piece is a potential relative pin.
Questions players ask about this tactic
What is a pin in chess?
A pin is when a piece cannot move because doing so would expose a more valuable piece behind it to capture. Only line-pieces (bishops, rooks, queens) can pin.
What is the difference between absolute and relative pins?
An absolute pin is against the king — the pinned piece literally cannot move because it would be illegal (exposing the king to check). A relative pin is against any other valuable piece — the pinned piece can technically move but doing so loses material.
How do I attack a pinned piece?
Pile attackers onto the pinned piece. Add pawns and pieces to attack the same square. Since the pinned piece can't move, eventually you'll capture it for less material than you spend.
How do I break out of a pin?
For relative pins, you can move the pinned piece if the trade behind it is acceptable. For absolute pins, you must block the pin with another piece, capture the pinning piece, or move the king to break the line.
Related Tactics
This pattern appears constantly once you know what to look for. try it on the chess board and watch for it in your next few games.