FinalesJouer avec les white

Rook Cutting Off the King

Learn how to use a rook to create an impassable barrier on a file, preventing the opposing king from approaching a passed pawn.

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Introduction

One of the rook's greatest powers in the endgame is creating a barrier — an invisible wall along a file or rank that the opposing king cannot cross. In this position, White's rook on c4 sits on the c-file, cutting off Black's king on e6 from ever reaching the b-file. Meanwhile, White has a passed b-pawn ready to advance. The key insight: as long as the rook stays on the c-file, the Black king can never interfere with the pawn's march. White simply pushes the pawn while the rook holds the barrier. Moving the rook off the c-file — even for a check — would throw away the win.

Contenu de la leçon

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1. b4

Push the pawn immediately! The rook on c4 already creates the perfect barrier on the c-file — there's no need to prepare further. The pawn begins its march to promotion. Black's king on e6 is trapped on the wrong side of the c-file and can never reach the b-pawn.

Pion passéCouper le roi
Coups alternatifs
Ke2 — Also wins, but wastes a tempo. The pawn can advance immediately since the rook barrier is already set up.
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1. ..Kd5

Black's best defense — the king approaches the pawn as aggressively as possible. Kd5 is the closest the king can get to the b-file. But look at the c-file: the rook on c4 controls c1 through c8, creating an invisible wall. The king cannot step to c5, c4, or any c-file square. It's permanently locked out.

Couper le roi
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2. Rc3

The rook shifts to c3, maintaining the c-file barrier while avoiding the king's attack. The rook can move anywhere along the c-file and the barrier holds. The critical rule: never leave the c-file! Moving to d4+ or e4+ with check looks tempting but would be a draw — the king would cross over and catch the pawn.

Couper le roiTour active
Coups alternatifs
Rd4+ — Draws! The check looks attractive, but it abandons the c-file barrier. After Kxd4 or Ke5, the king crosses over and stops the pawn.
Re4+ — Draws! Same problem — leaving the c-file lets the king through.
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2. ..Kd4

The king advances aggressively, attacking the rook directly. But it still cannot cross the c-file. The rook simply stays on the barrier — the king is stuck waving from the wrong side of the fence.

Couper le roi
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3. Kd2

Activate the king! White's king steps forward to support the rook and pawn advance. The three-step plan is clear: maintain the rook barrier, bring the king up, push the pawn. All three elements work together.

Activité des piècesCouper le roi
Coups alternatifs
Rc4+ — Draws! The rook leaves its barrier position. Never give up the c-file for a meaningless check.
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3. ..Kd5

Black's king oscillates helplessly between d4 and d5. It cannot make progress because the c-file barrier is absolute. Every approach is met with the same answer: the rook holds the line.

Couper le roi
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4. b5

The pawn advances again. Notice the pattern: the pawn has traveled from b2 to b5 in just three pushes, and the Black king has made zero progress toward stopping it. The rook barrier makes the king completely irrelevant to the pawn race.

Pion passéCouper le roi
Coups alternatifs
Rc4 — Draws! Moving to c4 lets the king approach after Kd4-Kc4-Kb5, catching the pawn.
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4. ..Kd4

The king tries once more — stepping to d4, eyeing c5. But the rook on c3 says no. The king can never, ever cross.

Couper le roi
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5. b6

The pawn reaches the 6th rank. Just two more squares to promotion. The Black king is four files away — it would need at least four moves to reach b8, but the pawn only needs two. The race is already over.

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5. ..Kd5

Black retreats, perhaps aiming for the c-file via d6-c7. But the pawn is too fast — it promotes in two moves.

Course de pions
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6. b7

One square from glory! The pawn reaches b7, threatening promotion. The rook on c3 has held the c-file barrier for the entire game — seven moves without ever leaving. This consistency is what makes the technique work.

Pion passéCouper le roi
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6. ..Kd6

Black's final desperate attempt — heading toward c7 to blockade the pawn. But the king is still on d6, two moves from b8. The pawn promotes next move.

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7. b8=Q+

Promotion with check! The pawn becomes a queen, delivering check from b8. With a queen, rook, and king against a lone king, the position is trivially won. The entire game was decided by one simple concept: the rook on the c-file created an impenetrable barrier that the Black king could never cross. While the king paced helplessly on the wrong side, the pawn marched to promotion unopposed.

Pion passéCouper le roiGain par tablebases

Points clés

  • A rook on a file creates an invisible barrier — the opposing king cannot cross that file
  • Once the barrier is in place, push the passed pawn immediately — no preparation needed
  • NEVER abandon the barrier file for a check or other tactical idea — it almost always draws
  • The rook can move anywhere along the barrier file without breaking the wall
  • Combine barrier + king activation + pawn advance for the winning formula

Résumé

You've learned how to cut off the king with a rook — one of the most powerful endgame techniques. By placing the rook on the c-file, you created a barrier the Black king could never cross. While the king paced helplessly on the wrong side, the pawn marched from b2 to b8 unopposed. The key was never leaving the c-file, not even for a check.

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