Pin

The pin is a common entry point to two skills at once: pattern recognition and calculation. It removes a piece's freedom by placing it in front of something more valuable. The definition is simple, but many players still fail to use pins in real games. This page covers what you need to find pins on the board, use them, and defend against them.

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How often does it show up

Of the 212,300 puzzles in this site's database, 13,506 (6.4%) carry the pin tag. The difficulty skews high: 33.6% sit above rating 1900 and only 12.5% below 1200. That is the reverse of the skewer, the tactic pins are usually taught beside, where 35.7% fall below 1200 and 22.3% above 1900.

The two tags rarely share the same puzzle. Only 1.1% of pin puzzles also carry the skewer tag (2.9% the other way round). Although both motifs use three pieces on one line, this database usually presents them as separate labels. That low overlap does not measure whether learning one motif transfers to the other; it only shows that a mixed practice set should include both tags rather than assuming that one tag covers both patterns.

What a Pin Is

A pin is a tactic where one piece blocks an attack against another piece behind it on the same line, so moving the front piece would expose the one behind. The pinning piece is always a long-range piece - a bishop, rook, or queen - and the line behind the pinned piece must hold a more valuable piece.

There are two kinds.

• Absolute pin - the piece behind is the king. A move that exposes that king to check is illegal. A move that keeps the line blocked or captures the attacker may still be legal.
• Relative pin - the piece behind is something other than the king (often a queen or rook). The pinned piece can legally move, but may expose the piece behind it. Before counting on winning that back piece, check whether the pinned piece can move with a forcing threat.

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The distinction matters in practice. An absolute pin forbids exposing the king, not every move: a slider may move along the pin line, and a pawn may advance while still blocking a file. A relative pin does not prohibit moving, but moving may lose the piece behind.

Why Pins Get Missed

The most common reason beginners miss pins is that they don't actively scan whether two enemy pieces are aligned on the same line. A pin is line geometry on a grid. If you only memorize the definition without building a scanning habit, you won't see pins in real games.

The second common mistake is treating relative pins as if they were absolute. You assume the pinned piece is stuck and do not add pressure to it. That gives the opponent time to break the pin, sometimes at the cost of a small loss, and the much bigger piece behind gets away.

Pin vs Skewer - How to Tell Them Apart

Pin and skewer are mirror tactics.

The structural setup is identical: two pieces aligned on a line plus a long-range attacker. What decides which tactic it is: which of the two pieces is more valuable.

Signs a Pin May Be Available

These signs suggest a pin may be available.

1. The opponent's king, queen, or rook stands on an open diagonal or file - any piece that ends up in front of it can be pinned.
2. Two opponent pieces are aligned on the same line - check if your bishop, rook, or queen reaches it.
3. A knight on f6 (or f3) stands in front of the queen on d8 (or d1) - with e7 (or e2) empty, Bg5 (or ...Bg4) is the classical pin against a knight shielding the queen.
4. The opponent's queen and rook are on the same file - a pin or skewer along that file may be available.

Example: Pressure That Is Not Yet a Pin (Ruy Lopez)

No capturesMaterial equal

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3. Bb5(5/14)

Pick a move, or step through with the arrow keys.

Moves

1.e4e5

2.Nf3Nc6

3.Bb5a6

4.Ba4Nf6

5.O-OBe7

6.Re1b5

7.Bb3d6

3.Bb5 is routinely called a pin, but at this moment it is not one. The diagonal from b5 to e8 (b5-c6-d7-e8) holds not only the c6 knight but the d7 pawn as well. In this position the knight is entirely free: Nb8, Ne7, Nd4, Nb4, and Na5 are all legal. Nothing is tied down.

The move still applies pressure, for a different reason. If the king stays on e8 and the bishop keeps the b5-e8 diagonal, moving the d7 pawn would pin the knight to the king. Until then, the bishop simply attacks the knight. The c6 knight is also the piece defending e5, so pressure on the knight is indirect pressure on e5. But Bxc6 is not a pin winning a piece for free - it is a straight trade of bishop for knight, and Black recaptures with bxc6 or dxc6. What White gains is a change in Black's pawn structure, not material.

This is the start of the Ruy Lopez, and it illustrates the difference between a pin that exists and an alignment where a pin could exist - one of the easiest distinctions to blur when learning the motif.

The board above opens at 3.Bb5, when the bishop attacks the c6 knight. There is no pin yet. Step forward to watch Black push the bishop back with ...a6 and ...b5, or step back to replay from the start.

When a Relative Pin Breaks

A relative pin should never be assumed to be 100% locked. Some practical rules of thumb:

• A knight relatively pinned to a queen may move with check or a mating threat. Calculate those forcing replies before assuming that taking the queen is safe.
• Bishop pins on a knight shielding a queen (Bg5 vs Nf6 pinning to Qd8) are often broken by ...Be7, ...h6 followed by ...g5, or by trading off the pinning bishop.

Always calculate whether the opponent can break the pin and create a bigger problem before treating the pinned piece as frozen.

How to Defend Against a Pin

If your own piece is pinned, three options exist.

1. Move the king or back piece off the attack line - moving along that same line may leave the pin intact.
2. Interpose another piece between - with two blockers, moving the original piece may no longer expose the piece behind. Check whether the interposed piece can be captured.
3. Capture the pinning piece - the cleanest solution when the capture is safe.

Option 3 is the most often overlooked. The first question to ask when one of your pieces is pinned: "Can I take the piece doing the pinning?"

Checklist

When scanning for pins on the board, ask yourself:

• Are two opponent pieces aligned on a single line (file, rank, or diagonal)?
• Can my bishop, rook, or queen reach that line?
• Is this an absolute pin or a relative pin? (Is the back piece the king?)
• If relative, can the opponent absorb a smaller loss to break the pin?

Related Tactics

• Skewer - the mirror pattern, where the more valuable piece is in front
• Discovered Attack - same line geometry, different mechanism
• Hanging Piece - an unprotected piece that can simply be taken. The chess warning LPDO (Loose Pieces Drop Off) is about the same danger. Often combined with pins

FAQ

Q. If a pin is broken, can I re-pin on the same square? Sometimes. Usually the opponent's intervening move shifts the back piece off the line, so the same pin doesn't reappear. Watch for re-pinning chances after each opponent move.

Q. Can a pinned piece deliver check? Yes. A pinned piece still attacks squares. In an absolute pin, sliding pieces (rook, bishop, queen) can move along the pin line and deliver check from the new square - they never leave the line, so the king stays safe. A knight in an absolute pin cannot move at all, so it can't deliver check by moving (though it still guards squares, e.g., preventing castling). In a relative pin, normal checks are possible, though they may lose the back piece.

Q. How is LPDO (Loose Pieces Drop Off) different from a pin? LPDO is not a tactic but a warning heuristic: loose (unprotected) pieces are the ones that tend to get lost. The motif it warns about, an unprotected piece being captured, is what this site tracks as hangingPiece. A pin uses line alignment of two pieces. They are different motifs, but they often appear in the same broad category of "tactics that lose material," so newer players sometimes lump them together.

Q. What is a good way to learn pins? Start with absolute-pin puzzles to build the line-alignment scanning habit, then move to relative pins, and finally to pin-plus-other-tactic combinations like pin-and-attack or pin-and-deflection.

References

• FIDE Laws of Chess, Articles 3.1.3 and 3.9.2: https://handbook.fide.com/chapter/E012023
• Lichess, puzzle theme Pin (the source of this site's puzzle tags). https://lichess.org/training/themes
• Statistics produced by scripts/analyze-theme-stats.mjs --theme pin; the run is recorded in docs/data/pin-stats.md.

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On Chess Motif Stats, pins are tracked as one of 53 separate motifs. When signed in, SM-2 calculates a review date per motif to guide selection. Recently attempted puzzles are excluded first, but the same puzzle may return when the available pool is too small. Practice recognizing the relationship, rather than memorizing one answer.

Start training: Pin Training

Related: Skewer · All tactics