Invading the opponent's second-to-last rank with a rook.
Why it matters
The seventh rank is where the opponent's pawns still live and where their king often is. A rook there attacks pawns that cannot run and cuts the king off from the rest of the board at the same time.
Two rooks on the seventh are close to decisive. They defend each other, they take every square on that rank, and against a king stuck on the back rank they usually force perpetual check at worst.
See it on a board
Both rooks are on the seventh and defend each other. Black's king is stuck on the back rank guarding the two pawns beside it, which means it is doing nothing else for the rest of the game.
Checked: the position really has the feature described.
How to play it
- Open a file, ideally one that leads to a square on the seventh the opponent cannot cover.
- Get one rook in, then bring the second: doubled on the seventh they defend each other.
- Look for the king first. Pawns on the seventh are the bonus; the trapped king is the point.
At each level
The same idea, said the way it is taught at each age.
Rook · ages 6–9
A rook on the seventh attacks pawns that have not moved and traps the king on the back rank. Two of them there is usually winning.
Queen · ages 8–11
Before invading, check that the rook has somewhere to go afterwards. A rook on the seventh that can be chased away by a knight or a bishop has achieved nothing.
What goes wrong
- Grabbing a pawn on the seventh and letting the rook be trapped or chased.
- Trading the second rook off, which turns a decisive attack into an ordinary endgame edge.
Questions people ask
- Is the seventh rank as good for Black?
- Yes — for Black it is the second rank, and it means exactly the same thing. Rooks belong on the rank where the opponent's unmoved pawns and king are.