Pin — the piece that cannot move
Learn absolute and relative pins, and how to exploit them to win material.
✓ Interactive boards ✓ Step-by-step ✓ Free forever
What is a Pin?
A pin is a tactic where a sliding piece (bishop, rook, or queen) attacks an enemy piece that cannot safely move because a more valuable piece stands behind it on the same line. Moving the pinned piece would expose the piece behind it to capture. There are two types of pins. An absolute pin means the pinned piece is shielding the king — it is completely illegal to move the pinned piece because doing so would leave the king in check. A relative pin means the piece behind is valuable (usually the queen or a rook) but not the king: the pinned piece can technically move, but doing so loses material. The distinction matters because absolutely pinned pieces cannot move under any circumstances; relatively pinned pieces can move if the calculation justifies the cost.
A Brief History
Pins have been understood since the earliest treatises on chess. Ruy López de Segura (1561) identified the bishop pin on the c6 knight as one of the most powerful ideas in the opening — the basis of the Ruy López opening still played by every world champion today. Wilhelm Steinitz, the first World Champion (1886), formalised exploiting pinned pieces as a strategic method: a pinned piece is effectively removed from the board, and piling attackers onto it is a standard winning plan. Aron Nimzowitsch later wrote in 'My System' (1925) that 'the pin is mightier than the sword' — his entire positional philosophy was built around restricting enemy pieces, with the pin as its primary tool.
The Key Conditions
A sliding piece must line up with two enemy pieces on the same rank, file, or diagonal
Only bishops, rooks, and queens can create pins — they are the 'sliding' long-range pieces. The pinning piece, the pinned piece, and the piece behind must all be on the same line. Knights and kings cannot create pins. A pin on a diagonal requires a bishop or queen; a pin on a rank or file requires a rook or queen.
The piece behind the pinned piece must be the king, or must be more valuable than the pinned piece
An absolute pin is when the king stands behind the pinned piece — moving the pinned piece is illegal because it exposes the king to check. A relative pin occurs when a queen, rook, or other valuable piece stands behind — moving is legal but loses material. If the piece behind is of equal or lesser value, there is no pin — just an attack.
The pin must be worth maintaining or exploiting
A pin is only useful if you can do something with it: pile more attackers onto the pinned piece, advance pawns to win it, or use the paralysis to improve your position elsewhere. A pin where the opponent can cheaply defend the pinned piece, interpose a piece to break the line, or capture your pinning piece at profit may not be worth the tempo.
How It Works — Step by Step
Absolute pin — cannot move
The bishop on g5 pins the black knight on f6 to the king on e8. The knight cannot legally move — any move would expose the king to check. This is an absolute pin.
Relative pin — costly to move
The bishop on b5 pins the c6 knight to the queen on d8. The knight CAN move (it's not the king behind it), but doing so loses the queen. This is a relative pin — moving is legal but very costly.
Attack the pinned piece
White piles up on the pinned f6 knight with d5 — threatening to win it because it cannot move. When a piece is pinned, add attackers until the defender runs out.
Break the pin
Black plays ...h6, attacking the g5 bishop and forcing it to decide. This is the most common way to break a bishop pin — drive it away with a pawn and free the pinned piece.
Common Misconceptions
An absolutely pinned piece is useless — it can never do anything
Even an absolutely pinned piece can still block key squares, defend other pieces, and participate in captures — it just cannot legally move off the line. More importantly, pins can be broken: by moving the valuable piece out from behind, by interposing, by attacking the pinning piece, or by a zwischenzug. An absolutely pinned piece is severely restricted, not dead.
You should always break a pin immediately
Sometimes the correct plan is to ignore the pin temporarily and improve your position elsewhere first. If breaking the pin costs a tempo or weakens your pawn structure, you might leave the pinned piece in place while creating threats on the other wing. Evaluate what breaking the pin costs before acting.
A pin on a bishop or knight against the queen is just as strong as a pin against the king
A pin against the queen (relative pin) can be broken at material cost — the pinned piece can move if the position justifies losing the queen. A pin against the king (absolute pin) cannot be broken by moving the pinned piece under any circumstances. Absolute pins are far more powerful and reliable in calculation.
Can You Spot It?
Test yourself with these positions
Absolute pin — the knight cannot move
White to move. The Ruy Lopez opening — White's bishop on b5 absolutely pins the black knight on c6 to the king on e8. The knight literally cannot move legally. How does White exploit this? Advance a pawn that the pinned knight would normally capture.
Relative pin — break it or exploit it?
Black to move. White's bishop on g5 creates a relative pin on the black knight f6 — if Nf6 moves, the queen on d8 is exposed to the bishop along the g5-d8 diagonal. What is the most direct way for Black to break this pin?
Pile up on the pinned piece
White to move. Black's f6 knight is relatively pinned to the queen on d8 by White's bishop on g5. White can pile up a second attacker on the f6 knight, threatening to win it because it cannot move. Find the best next attacker.
Pins in Your Openings
These openings frequently produce pinning opportunities
Ruy Lopez
The Ruy Lopez is defined by 3.Bb5, an absolute pin on the Nc6. Understanding when and whether to break this pin — with ...a6 to chase the bishop, or ...Nd4, or simply accepting the pin — is central to playing either side correctly. White's entire opening strategy revolves around using the pin to control the centre while Black's strategies all involve neutralising or exploiting the cost of maintaining the pin.
View opening pageItalian Game
The Italian Game frequently produces relative pin positions with Bg5 on Nf6 (pinned to the queen). White exploits the pin by piling attackers on f6 or using the pinned knight's paralysis to advance central pawns. The famous Fried Liver Attack arises because the pinned Nf6 cannot defend f7 adequately — a direct consequence of the pin's restricting power.
View opening pageQueens Gambit Declined
The Queen's Gambit Declined regularly produces bishop-pins on the f6 knight via Bg5. The 'Berlin Wall' Bg5 positions in the QGD are defined by both sides' plans around the f6 pin: White wants to exploit it to double Black's pawns or win the piece, Black wants to challenge the pin with ...h6 or ...Ne4 to trade the bishop. The entire strategic battle of the QGD frequently revolves around this pin.
View opening pageFamous Pin Games
The first official World Championship match featured Steinitz repeatedly using bishop pins on the c6 and f6 knights to restrict Zukertort's counterplay. Steinitz's approach — systematically exploiting pinned pieces as structural weaknesses rather than one-move tricks — was revolutionary and became the foundation of modern positional chess. Several decisive games in this match turned on pinned pieces that could never escape.
Karpov's mastery of the relative pin shaped the entire match. His ability to create pins on the c-file and d-file — locking down Korchnoi's active pieces for long stretches of the game — was considered one of the finest demonstrations of pin-based positional pressure in World Championship play. Karpov's patient technique of maintaining pins while improving other pieces became a study model for a generation of players.
Fischer's crushing 6–0 sweep of Taimanov was built substantially on pin exploitation. Fischer repeatedly opened with lines where his bishops achieved early pins on key central knights, and his ability to maintain those pins while building an irresistible position was extraordinary. The match is one of the most one-sided in World Championship history, and the pin was one of Fischer's primary weapons throughout.
Common Pin Traps
Patterns to watch out for
Moving an absolutely pinned piece (illegal in over-the-board play)
Pinned piece attempts to move — exposes king to check — illegal move In online chess, the platform simply prevents you from moving an absolutely pinned piece. In over-the-board play, it is an illegal move that must be taken back. Always check whether a piece is absolutely pinned before moving it — especially after a check that forced a piece interposition, which can create unexpected absolute pins.
Breaking a relative pin into a worse tactical problem
Nf6 moves despite Bg5 — Bxd8 Kxd8 — lost the queen for a bishop A relative pin can be broken — but breaking it incorrectly walks into a tactical disaster. For example, moving Nf6 when it is relatively pinned to the queen by Bg5 simply loses the queen. Always calculate what happens to the piece behind the pinned piece before moving through a relative pin.
Pinning a piece that can immediately interpose or escape cheaply
Pin established — opponent interposes a cheap piece to break the line — pin is gone Not every pin is automatically useful. If the opponent can place a low-value piece between your pinning piece and the piece behind, the pin is broken at almost no cost. Before committing to a pin, check whether the opponent has an interposing piece available and what it would cost them to use it.
Tips for Club Players
Check every move you make: are you moving a piece that is protecting a more valuable piece behind it? If yes, moving it may create a pin vulnerability for your opponent.
The Ruy Lopez bishop pin (Bb5 on Nc6) is the most important pin to understand — it appears in millions of games. Study how both sides handle it before learning any other aspect of the opening.
Absolute pins are your most reliable tactical weapons. A piece that literally cannot move is effectively removed from the board for the duration of the pin. Pile attackers onto it.
Do not automatically try to break a pin immediately. Sometimes the correct plan is to reinforce the pinned piece with another defender, or to create counterplay on a different wing first.
In online chess, be especially careful about relative pins — the engine will allow you to move a relatively pinned piece even if it loses the queen. Unlike absolute pins, no warning stops you.
After pinning an enemy piece, ask: 'Can I bring another attacker onto the pinned piece faster than the opponent can defend it?' Count attackers versus defenders — if attackers outnumber, the pin wins material.
Frequently Asked Questions
Everything you need to know about pins
A pin is when a sliding piece (bishop, rook, or queen) targets a piece that cannot safely move because a more valuable piece sits behind it on the same line. If the piece behind is the king, it is an absolute pin — the pinned piece literally cannot move legally. If the piece behind is any other valuable piece (usually the queen), it is a relative pin — moving is legal but loses material.
An absolute pin has the king behind the pinned piece. Moving the pinned piece would expose the king to check, which is illegal. A relative pin has any other valuable piece behind the pinned piece — the queen, a rook, or a bishop. The pinned piece can technically move but doing so loses the piece behind it. Absolute pins are more powerful because the restriction is total and cannot be overridden by calculation.
There are four reliable ways to break a pin: (1) Move the valuable piece out from behind the pinned piece, removing the pin's threat. (2) Interpose another piece between the pinning piece and the piece behind, blocking the line. (3) Attack the pinning piece with a pawn or piece to force its retreat or trade. (4) For relative pins only — move through the pin if the tactical calculation shows the gain outweighs the loss of the piece behind.
Not in the usual sense. A king cannot be 'pinned' because a king in check must move immediately — there is no piece being protected behind the king that keeps it in place. However, the king is the ultimate target of an absolute pin: it is the piece that makes the piece in front of it immovable. The king is what creates the absolute pin, not what is pinned.
Yes. Kingsights analyses your recent games and highlights positions where pin opportunities were missed or incorrectly handled — both pins you could have created against your opponent and pins your opponent used against you. Enter your Chess.com username above to get your personalised analysis.
Find pins in my games
Kingsights scans your real games to find pin opportunities you missed — and pins your opponent created.
✓ Interactive boards ✓ Step-by-step ✓ Free forever