A Rook delivers checkmate while anchored by a Knight, which is backed up by an supporting pawn, creating a tightly woven geometric knot.
Why it matters
Four things do this one: a rook gives the check, a knight defends the rook, a pawn defends the knight, and the enemy's own pawns take away the last squares. Every piece is holding the one in front of it, which is where the name comes from.
It is the clearest example of a chain of defenders in a mating net. Remove any one link — the pawn, the knight — and the king walks out, which makes it a useful thing to look at from the defending side too.
See it on a board
The rook checks on h5, the knight defends it and covers g6, the e3 pawn holds the knight, and Black's own pawns on g7 and h7 take the rest.
Checked: this line ends in checkmate.
How to play it
- Find an enemy king boxed in by its own pawns, typically on h6 with pawns on g7 and h7.
- Post a knight where it defends the checking square and covers a flight square — f4 covers h5 and g6.
- Support the knight with a pawn, then check with the rook on the square the knight defends.
At each level
The same idea, said the way it is taught at each age.
Rook · ages 6–9
Count the chain before you play the check: the rook is safe because the knight guards it, and the knight is safe because a pawn guards it.
Queen · ages 8–11
Defensively, the lesson is the pawns. A king with pawns on g7 and h7 and no escape to the sixth rank is one knight away from this, so give it a square in advance.
What goes wrong
- Checking with the rook before the knight is in place, so the king simply takes it.
- Forgetting that the enemy pawn might be able to capture the checking piece from its square.
Questions people ask
- What makes it a hook?
- The shape of the defending chain: rook, knight and pawn hooked together, each one holding the next, with the enemy pawns closing the loop.