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Guided lesson · Improver · Middlegame

The skewer

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The skewer is the pin's mirror-image sibling: you attack in a straight line and the big piece is IN FRONT. Since it can't stay put (it's usually the king, or something very expensive), it steps aside… and uncovers the piece behind it, which you cash in. It looks like magic and it's geometry — with a condition that decides everything: it needs DISTANCE. You'll see the skewer in its element, and also the most famous case where it fails, so nobody sells you a draw as a win.

The key idea

Skewer: king (or big piece) in front, loot behind, attack in a straight line. Its hidden condition: the piece behind must be FAR from the king — if the king can defend it while stepping aside, all you get is a trade.

Example 1 · The textbook skewer: check, step aside, cash in

Black's king planted itself in the center… in front of its own rook. A single White rook move explains it all.

  1. Rd1+ The skewer: check in line with Black's rook behind the king. The king is FORCED to step aside (blocking isn't possible, nor is capturing)… and by stepping aside, it uncovers.
  2. Ke6 It doesn't matter which square: none keeps the king on the d-file or manages to defend d8. That's the geometric condition fulfilled: Black's rook is left FAR from its king.
  3. Rxd8 Full payoff: a whole rook. Compare it with the pin to fix both ideas at once: in a pin, the valuable thing is BEHIND and the victim can't move; in a skewer, the valuable thing is IN FRONT and can't stay put. Same corridor, opposite direction — and you look for both the same way: rival pieces lined up.

Example 2 · When the skewer does NOT win: the bodyguard king

The textbook ending: you both promote, you skewer the king with your brand-new queen behind it… and it's a draw. Watch why — this honesty is worth half a point.

  1. a8=Q+ Promotion with a skewer built in! The new queen gives check along the long diagonal, and Black's queen on h1 is right behind it. It looks like the dream ending…
  2. Kh2 …and here's the fine print: the king steps aside WITHOUT letting go of its queen's hand. h2 still defends h1. The distance condition, unmet: the king and the loot were neighbours.
  3. Qa2+ White tries everything — capturing on h1 meant trading queens and signing a king-versus-king draw on the spot.
  4. Kg1 The king shuffles between g1 and h2, stuck to its queen like glue. There's no way to separate them.
  5. Qb1 Nothing doing: Black's queen, always defended, can't fall for free. The engine confirms it: an exact draw. Keep the double moral in mind — a skewer needs DISTANCE between the king and the loot, and in double-promotion endings, whoever promotes right next to their queen doesn't lose to a skewer. Knowing this will save you from chasing ghosts… and from resigning in positions you could have saved.

Practice

Black's king in the center, Black's rook behind it — the geometry is served. Execute the skewer: line up, give check, cash in.

  1. The skewer set up: check in line with the loot behind it, and FAR from the king. Now the king can neither stay nor protect it. Black's king and rook share a file. Bring your rook to that file — with check.
  2. A clean rook. The textbook skewer: the big one steps aside, the small one pays. From today, every time you see the rival king lined up with something valuable, your rook already knows the way. The king stepped aside and left the corridor open: cash in what's behind it.

The skewer, with its geometry and its fine print: line, check, distance, payoff. And from Example 2, the antidote against false hope: if the king can escort its piece, there's no skewer there — just a trade. Looking for rival lineups has just entered your routine for every move.