A rook and a knight mate a king in the corner: the knight covers the escape squares and defends the rook standing beside the king.
Why it matters
A rook and a knight are enough to mate a king in the corner, and they are unusually efficient about it: the knight covers two escape squares and defends the rook at the same time.
It is one of the oldest recorded patterns in chess, which is why it has an old name. Knowing it changes what you look for in an attack — with a knight on f6 or f3, a rook reaching the seventh is often mate rather than merely strong.
See it on a board
The knight on f6 guards g8 and defends h7 at once, so the rook can sit right beside the king.
Checked: this line ends in checkmate.
How to play it
- Place a knight two squares diagonally from the corner — f6 against a king on h8.
- Check that the knight covers g8 and defends h7.
- Bring the rook to h7. The king cannot take it, cannot go to g8 and cannot go to g7.
At each level
The same idea, said the way it is taught at each age.
Bishop · ages 5–7
A knight near the corner and a rook next to the king is mate. Remember the shape: knight on f6, rook to h7, king on h8.
Rook · ages 6–9
Watch for it in reverse too. If your king is heading for the corner and the opponent has a knight on f6, the seventh rank is a mating square, not just a strong one.
What goes wrong
- Bringing the rook to h7 while the knight is somewhere it does not defend it.
- Allowing the king to slip out to g8 before the knight controls it.
Questions people ask
- Does the Arabian mate work with a queen instead of a rook?
- A queen on h7 mates too, but it does not need the knight for the escape squares, so it is a different pattern. The point of the Arabian is that a rook alone would be captured.