The tactic that empties the board one forced king move at a time, and quietly decides half of all endgames.
Picture a kebab. Now picture your king as the first thing on the stick and your rook as the second. That's a skewer: a bishop, rook, or queen attacks your most valuable piece along an open line, and when that piece is forced to step aside (kings are terrible at standing their ground), whatever was sheltering behind it gets eaten.
If you've read our guide to pins, this will look familiar, because it's the same geometry running backwards. In a pin, the cheap piece stands in front and is frozen. In a skewer, the expensive piece stands in front and is forced to move. A pin freezes; a skewer shoves. Of the two, the skewer is more violent: there's no clever defense of the pinned piece, no waiting it out. The king is in check right now, and the rules don't care what happens to the rook behind it.
The Basic Skewer
See how the calculator limits the damage
Black's rook on e8 checks the white king on e4, with White's own rook on e1 stuck on the same file behind it. The king must step aside, and then the e1-rook is captured. There is no move that saves it; the calculator's job here is purely grief counseling.
Notice what made this possible: king and rook on the same open line. Neither piece did anything wrong individually. The crime was standing in a row.
The Same Trick From the Winning Side
Here's the pattern with you holding the skewer. White's rook checks along the e-file, and Black's queen is the unlucky second item on the stick:
Load this position in the calculator
The black king on e6 is in check from the rook on e2 and must leave the e-file. It can't block (the queen can't reach the squares between) and can't capture. Wherever it goes, the rook takes the queen on e8. A rook trades itself for a queen; excellent business.
Why Endgames Are Skewer Country
Skewers need two ingredients: open lines and valuable pieces standing on them. The endgame supplies both. Pawns have traded off, so files and diagonals run the whole length of the board. And your king, which spent the middlegame hiding behind pawns like a sensible monarch, is now out in the open, marching around, sharing lines with everything you own.
The classic heartbreak runs like this: both sides race to promote a pawn, both succeed, and then one new queen checks the enemy king from across the board, with the other new queen lined up behind it. One player has two queens for about a second and a half. Rook endings are full of the same trick: before you push your passed pawn or send your king on a journey, look at what shares a line with it. Endgame skewers don't win pieces; they win games.
How Not to Get Skewered
Mind the queue. The skewer checklist is one question: is my king standing on an open rank, file, or diagonal with anything valuable behind it? Empty squares between them don't matter; sliding pieces see all the way down the line. When your king moves, especially in the endgame, choose squares that don't share lines with your rooks and queen.
Watch diagonals you can't see. Rook skewers announce themselves; files are easy to look at. Bishop skewers arrive from across the board on long diagonals, delivered by a piece that's been sulking in the corner since move 12. If your king and queen are both on dark squares, somewhere a dark-squared bishop is taking an interest.
If it lands anyway: check whether you can block the line, whether the front piece can move to a square that still defends the back one (kings can sometimes retreat toward the threatened piece), or whether you have a counter-threat loud enough to change the subject. If none of that works, save the more valuable piece and start plotting your comeback.
Quick Answers
What is a skewer in chess? A sliding piece attacks a valuable enemy piece, usually the king, with a cheaper piece standing behind it on the same line. The front piece is forced to move; the back piece is captured.
Skewer vs pin? Same lineup, opposite value order. Pin: cheap piece in front, frozen in place. Skewer: expensive piece in front, forced to move. A pin freezes; a skewer shoves.
How do you defend against one? Prevention beats cure: keep your king off open lines it shares with your rooks and queen. Once a check-skewer lands, you can usually only block, retreat toward the back piece to defend it, or counterattack.
Why do skewers decide so many endgames? Open lines plus an active king equals skewer weather. Promotion races in particular are routinely settled by a skewer the moment both sides queen.
