Rook mate: fence first, march second

From Chess Fundamentals by José Raúl Capablanca (1921), Chapter 1 — First Principles, Example 1 (Rook and King against King) · Beginner · about 4 minutes.

A rook can't mate alone — but it builds an unbreakable fence. Capablanca's first example teaches the whole method in one line: cut the enemy king off on its last rank with a single rook move, then march your own king up until the two kings stand face to face. The rook gives exactly one check in the entire ending, and it's mate.

Starting position (FEN): 7k/8/8/8/8/8/8/R6K w - - 0 1

The line

• 1. Ra7 — The fence. From a7 the rook seals the entire 7th rank, so the black king can never leave the back rank. One move, half the work done.
• 1... Kg8 — All Black can do is walk the back rank.
• 2. Kg2 — Now the king marches. The rook holds the fence by itself — mate will need both pieces.
• 2... Kf8
• 3. Kf3 — Capablanca's guideline: keep your king on the same file as the enemy king while you advance, mirroring its moves.
• 3... Ke8
• 4. Ke4
• 4... Kd8
• 5. Kd5
• 5... Kc8
• 6. Kd6 — The one subtlety: not Kc6, which lets the king slide back to d8 and drags the ending out. From d6 White covers both c7 and e7.
• 6... Kb8
• 7. Rf7 — A waiting move along the 7th. Black must now commit to the corner — and the fence never drops.
• 7... Ka8
• 8. Kc6 — The king closes the last stretch...
• 8... Kb8
• 9. Kb6 — ...and takes b6, directly facing the black king. Every escape square is now covered.
• 9... Ka8 — Forced.
• 10. Rf8# — The kings face off, so the rook swings to the back rank — the ending's only check, and it's mate. Ten moves in total.

Takeaway

Rook endings against a bare king are a procedure, not a puzzle: fence on one line, king march, kings face to face, back-rank check. If you're giving checks along the way, you're chasing instead of boxing.

Play this lesson move by move on the interactive board at https://www.brilliantknight.com/lessons/chess-fundamentals-first-principles/rook-mate-drive-to-the-edge · All lessons