Rook Endgame
Rook versus Pawn
Also known as: Rook against Pawn
King and rook against king and a single pawn is, with rare exceptions, a win for the stronger side. The rook is worth about five pawns, so the task is simply to stop the pawn from promoting and then capture it with the king, leaving king and rook against a bare king. The rook halts the pawn by controlling its promotion square, either from in front on the same file or by checking from behind. Once the pawn can never queen, the king walks up at leisure to round it up. This handling of rook against a lone pawn is the seed of the richer rook endings.
1. Kb3 Kc1 2. Kxa2
Why the rook wins
King and rook almost always defeat king and a single pawn. The rook is worth about five pawns, so if the stronger side can simply capture the lone pawn it is left with king and rook against a bare king, an elementary win. The whole problem therefore reduces to two steps: stop the pawn from promoting, then round it up with the king.
The rook stops the pawn by controlling its promotion square, either sitting on the file in front of the pawn or checking it from behind. Tarrasch's guideline that rooks belong behind passed pawns captures the idea: from the rear the rook both restrains the pawn and stays active. Once the pawn can never queen, the king comes forward at its own pace to win it.
The demonstration
In the diagram the rook on a8 controls the entire a-file, so the a2-pawn can never advance to promote; its queening square is covered from afar. That leaves White free to bring the king forward. 1.Kb3 steps up and attacks the pawn on a2, which is defended only by the black king.
The black king cannot both defend a2 and stay out of the white king's way, so 1...Kc1 is forced to give ground. 2.Kxa2 then captures the pawn, and what remains is king and rook against a bare king, a trivial and forced win.
The one exception
The rule is not quite universal. The main exception is a pawn that has reached the seventh rank, sheltered by its own king, when the defending rook's king is cut off too far away to help. There the stronger side may be forced to give up the rook for the pawn, and the game is drawn.
For that reason the defender in such positions races the pawn forward with the king alongside, while the attacker hurries the rook behind the pawn and brings the king into contact as fast as possible. The same struggle of rook against pawn underlies the richer rook endings, the winning Lucena position and the drawing Philidor position, where a rook contends not with a bare pawn but with pawn and rook together.
Key ideas
- King and rook almost always defeat king and a single pawn.
- Stop the pawn first by controlling its promotion square, then win it with the king.
- A rook placed behind a passed pawn both restrains it and stays active.
- Once the lone pawn falls, king and rook against a bare king is an elementary win.
- The main exception is a pawn on the seventh, sheltered by its king, with the defending king cut off far away.
- The rook is worth about five pawns, so in the normal case it need never be surrendered.
Typical plans
White
- Place the rook so it controls the pawn's promotion square and the pawn cannot advance.
- March the king up to attack and capture the halted pawn.
- Convert the resulting king-and-rook versus king into the basic mate.
Black
- Push the pawn with the king alongside to shelter it toward the seventh rank.
- Try to cut the attacking king off from the pawn.
- Aim for the drawing exception where White must surrender the rook for the pawn.