Rook endings

A game on lichess.org, 2014. Black has a pawn on d2, one step from promotion. The white rook on d3 guards d1, and the white king on f3 is not far away either. Black to move.

A rook not only defends and attacks, it also blocks lines. In rook endings such tricks come up all the time, and knowing them matters as much as knowing the theoretical positions. Rook endings are also the most common in practice: rooks come into play later than the other pieces and are usually the last to be traded. There is even a joke about them: all rook endings are drawn. It is attributed to Savielly Tartakower, and there is some truth in it: in a rook ending the defending side often survives even a pawn down.

The active rook

The main rule of rook endings: the rook must be active. An active rook attacks the opponent's pawns, cuts off their king, gives checks. A passive rook only defends its own pawns, and the opponent calmly strengthens their position. The difference is so great that experienced players often give up a pawn just to activate the rook. An extra pawn with a passive rook often counts for nothing against an active enemy rook.

Where the rook belongs next to a passed pawn is told by a rule associated with Siegbert Tarrasch: the rook should stand behind the passed pawn, its own or the opponent's. Behind its own pawn the rook pushes it forward and grows more active with every pawn move. Behind the enemy pawn it holds the pawn back and also grows more active as the pawn advances. A rook in front of the pawn, on the contrary, loses freedom with every pawn move.

Why does activity matter so much? The rook is a long-range piece, and in an endgame, with the board empty, it covers many squares at once. An active rook makes the opponent spend moves on defence. Every pawn that has to be covered ties down their rook or king. A passive rook causes no such worries, and the opponent gets time for everything: to bring up the king, create a passed pawn, attack pawns.

A rook on the seventh rank is especially strong. There it attacks pawns still on their starting squares and cuts off the enemy king on the back rank. Such rooks were covered in the chapter “Open files and the seventh rank”. In the endgame the rule works even more strongly: the queens are gone, and almost nothing disturbs a rook on the seventh.

The second important weapon is cutting off the king. A rook on a file or rank stops the enemy king from crossing it. If the defending king is cut off from the passed pawn, it cannot reach the promotion square, and the rook has to defend alone. Often a win or a draw depends on how many files the king is cut off by: by one, the defence is still possible; by two or more, usually not.

Kings are cut off along files and along ranks. A king cut off along a rank cannot get in front of the pawn, and the attacker advances it under the protection of their own king. So when you get the chance to place the rook so that the enemy king ends up on the other side of the line, do not miss it. The defender, on the contrary, keeps their king as close to the passed pawn as possible, even if that means leaving other pawns behind.

The king in a rook ending must be active too. It supports its own pawns and attacks the enemy's. But it has a weakness: a king in the open can be exposed to checks, and checks are often followed by a tactical blow.

Tactics in rook endings

Tactics in the endgame are the same as in the middlegame: checks, pins, interference. There are just fewer pieces, so every trick stands out more. The most common in rook endings is a check that lures the king away from defending a rook or a pawn. In the next position the white king attacks the rook on c4, and the black king defends it.

The same trick saves games in defence too. If the opponent's king stands next to its own rook, a check may force it away, and then the rook can be taken. Before every move in a rook ending, check: what checks do I have, what checks does my opponent have, and what is left undefended after them?

Another common trick involves a rook pawn. A white pawn stands on a7, the white rook in front of it on a8, and the black rook holds the pawn from behind along the a-file. The black king must stand on g7 or h7. If it leaves those squares, White plays Rh8: the rook vacates a8 and threatens a8=Q. And if the black rook takes the a7-pawn while the king stands on the seventh rank, the check Rh7+ follows, and the rook on a7 is lost behind the king. That is a skewer.

The Lucena position

Every chess player knows two rook-ending positions. The first is the Lucena position. The pawn has reached the seventh rank, its king stands in front of it on the promotion square, and the enemy king is cut off by the rook by one file. The enemy rook stops the king from getting out from in front of the pawn. The position is named by tradition after the Spaniard Luis Ramírez de Lucena. It is not in his book of 1497: it first appears in Alessandro Salvio in 1634. It is worth knowing by heart: it occurs in amateur games and in grandmaster games alike.

The winning method is called “building a bridge”. First the rook drives the enemy king further away with a check. Then the rook goes to the fourth rank. The king steps out from in front of the pawn, the enemy rook checks from the side, the king walks down towards its own rook, and when it reaches the fifth rank, the rook steps between it and the enemy rook. The pawn queens.

Now play the Lucena yourself. The position is mirrored: the pawn on f7, the king on f8, the black king cut off along the e-file. The engine defends against you.

Why is the bridge built on the fourth rank? The king steps out from in front of the pawn and walks down, and the enemy rook checks it along the file. When the king reaches the fifth rank, the rook from the fourth steps between it and the enemy rook. The checks are over, and the pawn has been safe all along: the king either stands next to it or shields it from the enemy rook.

If the enemy rook checks from close range, the bridge is not even needed: the king walks up to the rook and takes it. And if the enemy king is cut off by two files, it is even easier for the attacker: their king steps out on the side where the enemy king is not.

The Lucena position is the goal the attacker aims for from the start of the ending. While the pawn is far back, they cut off the opponent's king with the rook, advance the pawn under the protection of their own king and make sure the enemy king does not come back. If that works, the familiar bridge technique decides the rest.

The Philidor position

The second famous position shows how to defend. It was analysed by François-André Danican Philidor, the best chess player of the eighteenth century. In the Philidor position the defending king stands in front of the opponent's pawn, and the rook holds its own third rank, the sixth for Black. The white king cannot cross to the sixth rank, and the pawn has not reached it yet.

While the pawn stands on the fifth rank, Black simply moves the rook along the sixth. If White pushes the pawn to the sixth rank, their king loses its shelter: the square in front of it is taken by its own pawn. Then Black's rook goes straight to the first rank and checks the white king from behind. There is nowhere for it to hide.

The defender's main mistake is to take the rook to the first rank too early, while the pawn is still on the fifth. Then the white king comes to the sixth rank, and together with the pawn it builds a shelter from the checks. Another mistake is to check from close range: the king walks up to the rook and takes it. Check from a distance.

If you are too late to occupy the sixth rank, passive defence is left: the king on the promotion square, the rook on the back rank. It saves the game against a rook pawn or a knight pawn, when the attacker lacks room to outflank. Against a centre pawn or a bishop pawn passive defence usually loses. So take up the Philidor position while it is still possible.

In the Philidor position the defending king stands on the promotion square or next to it. If the pawn is already on the sixth rank and the white king is close, the black king must not leave the eighth rank, or the pawn will queen. The king's job is to stand, the rook's job is to check. The division of labour is simple, which is why the Philidor position can be held even in time trouble, if you know it in advance.

The Lucena and the Philidor are two sides of one story. If the defending king has managed to get in front of the pawn, it is usually a draw. If it is cut off and the pawn has reached the seventh rank, it is usually a win. Most rook endings with an extra pawn come down to a fight for one of these positions: the attacker aims for the Lucena, the defender for the Philidor. So in defence, head for the pawn's promotion square first, while the way there is open.

With a rook pawn things are more complicated, and the defender saves the game more often: the attacking king has no room to step out from in front of the pawn on the other side. One well-known defensive set-up, the Vančura position, is covered in endgame textbooks: the rook attacks the pawn from the side and checks along the rank.

When both sides' pawns stand on the same wing, an extra pawn often does not win. Rook and four pawns against rook and three on one wing is usually a draw with correct defence. The defender should keep their king in front of the pawns and not weaken them without need. The attacker, on the contrary, should trade pawns so as to create a passed pawn far from the enemy king.

How do you study rook endings? Start with the Lucena and the Philidor: you should be able to play them for either side without thinking. Play them out against the engine, changing where the kings and rooks stand. Then move on to positions with several pawns and go through your own rook endings after the game. Almost every one has a moment where the rook could have been more active.

The rules of this chapter in short. The rook must be active, even at the cost of a pawn. The rook stands behind the passed pawn, its own or the opponent's. A cut-off king is half the win for the attacker. The attacker aims for the Lucena and builds a bridge on the fourth rank. The defender aims for the Philidor: the king in front of the pawn, the rook on the third rank from its own side, and checks from behind once the pawn advances.

What's next

Besides pawn and rook endings there are a few positions that occur more rarely but are worth knowing: the bishop-and-knight mate, queen against pawn, fortresses. They are the subject of the next chapter.