Chess Skewers

Attack the big piece, win the little one behind it.

Pin vs. skewer, side by side

Pin: the less valuable piece (knight) is in front, the king behind it.

Skewer: the more valuable piece (king) is in front and must move, exposing the queen behind it.

Pin or skewer?

Is this a pin or a skewer?

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A skewer attacks a valuable piece that's forced to move, exposing a less valuable piece directly behind it on the same line to capture. It's the mirror image of a pin — same geometry, opposite order.

The clearest skewers involve the king: since a king in check must move (or block, or capture the checker), a skewer through the king is unavoidable if nothing can interpose.

Pin vs. skewer

The test is simple: which piece is in front? If the less valuable piece is in front (shielding something bigger), it's a pin. If the more valuable piece is in front and has to move, exposing something smaller, it's a skewer.

King skewers

A check that skewers the king is the most forcing version: the king has no choice but to move (assuming nothing can block or capture), so the piece behind it falls automatically.

Queen and rook skewers

Away from the king, a skewer usually targets a queen or rook with something less valuable sitting behind it. These work best when the front piece has nowhere useful to go that also saves the piece behind it.

Diagonal vs. file/rank skewers

Bishops and queens deliver diagonal skewers; rooks and queens deliver file/rank skewers. The line itself doesn't change the idea — only which piece can execute it.

Frequently asked questions

Is a skewer just a pin backwards?

Geometrically, yes — same line, same idea of a piece behind a piece, but with the higher-value piece in front instead of behind.

Why are king skewers so effective?

Because check is forcing — the king must move (or the check must be blocked or captured), so if nothing can interpose, the piece behind the king is lost automatically.

Can a knight deliver a skewer?

No — skewers require a piece that attacks in a straight line (bishop, rook, or queen), since the whole idea depends on two pieces sitting on the same line.

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