What is a cross-pin in chess?

A cross-pin is a tactic in which a single piece is simultaneously pinned along two different lines by two attackers. Because moving the piece in any direction would expose a more valuable one on either line, the cross-pinned piece has no safe escape and can often be captured.

The black rook sits at the crossing of two pins. The white queen pins it against the king, while the white bishop pins it against the queen.

What makes a cross-pin different from a regular pin?

A regular pin pins a piece along a single line. A cross-pin pins a piece along two lines at the same time. The cross-pinned piece is stuck in place and can often be captured on the next move.

The queen moves to create a cross-pin, freezing the black bishop on two axes at once. Engine-verified position, Elo 1799.

How do you create a cross-pin?

A cross-pin requires one pin to already exist on the board. Your job is to find a second pin line and place one of your pieces on it. Look for an enemy piece that is already pinned along one direction, then ask: is there a diagonal, a rank (a horizontal row), or a file (a vertical column) where I can add a second pin through that same piece?

Before you commit a piece to the second pin line, make sure that square is safe. If your opponent can simply capture your pinning piece, the cross-pin falls apart and you may lose material instead of winning it.

The white queen moves to create a cross-pin on the enemy rook, already pinned on the horizontal against its king.

How do you defend against a cross-pin?

Avoid placing or keeping a valuable piece at the intersection of two open lines. If you see your opponent already has an existing pin, try to break the pin before a second cross-pin can be created. Here are your main defensive options:

• Act fast. Once there is one pin, break that pin before your opponent can add a second one.
• Block a line. Place a less important piece on a second potential pin line. This may prevent a second pin and free your piece.
• Remove a pinning piece. If you can capture or chase away one of your opponent's two pinners, the cross-pin collapses back into a single pin, which is much easier to handle.
• Counterattack. Create a bigger threat (like a check or a threat to your opponent's queen) that forces your opponent to respond before they can create a cross-pin or capture the cross-pinned piece.

The black knight is cross-pinned, but breaks free by delivering check. White must respond to the check rather than exploit the cross-pin.

See it in action

Example 1: A cross-pin with a queen and rook

Add a cross-pin.

Solution: The white queen moves three squares, capturing a pawn and adding a diagonal pin on the rook. The rook was already pinned to its queen.

Example 2: A cross-pin with a queen and bishop

Cross-pin the white bishop.

Solution: The black queen slides to create a cross-pin on the white bishop against its queen.

Example 3: Two pieces, one cross-pin

Add the second pin.

Solution: The white bishop moves one square, creating a cross-pin on the black bishop. The black bishop is now pinned on two diagonals.

Frequently asked questions

Can any piece be cross-pinned?

Yes. Any piece, except for the king, can be cross-pinned as long as it sits at the intersection of two pin lines with more valuable pieces behind it on both lines.

Do you need two different pieces to create a cross-pin?

Yes. Each pin line requires its own attacking piece. A single piece can only attack along one line at a time, so you need at least two pieces to build a cross-pin.

Is a cross-pin always winning?

Almost always. A cross-pinned piece may not be able to move at all, or cannot move without losing material on one of the two lines. In many positions, you can win material on your next turn. However, make sure the cross-pin you're envisioning is safe. If your opponent can capture in a certain direction and come out ahead, the cross-pin may not be such a good idea after all.