A textbook combination where a Bishop acts as a rock-solid anchor on a long diagonal, protecting a Rook that penetrates the back rank right next to the enemy King.
Why it matters
A rook lands on the back rank right next to the king, and a bishop standing far away on a diagonal is the only reason it cannot be captured. That is the whole pattern, and it is one of the most famous mates in chess because Morphy played it in an opera box.
It teaches something more general than the mate: a piece deep in the enemy position is safe if a long-range piece defends it from home, and the defender does not have to be anywhere near the action.
See it on a board
The rook mates on d8 because the bishop on g5 defends it from four squares away, and covers e7 at the same time.
Checked: this line ends in checkmate.
How to play it
- Get a bishop onto the diagonal that ends on the king's back rank — usually g5 against a king on e8.
- Make sure the king's escape square in front of it is covered by that same bishop.
- Deliver the rook to the back rank, protected along the diagonal, with the king's other squares covered by the rook itself.
At each level
The same idea, said the way it is taught at each age.
Knight · ages 4–6
A rook right next to the enemy king is mate if the king cannot take it. Look for a bishop far away that is guarding the rook.
Rook · ages 6–9
The bishop is doing two jobs at once — defending the rook and covering the escape square. Any single defender doing two jobs is worth checking for overload, in your own position as well.
What goes wrong
- Putting the rook on the back rank before the bishop is defending it.
- Missing that the king has a flight square on the other side, off the bishop's diagonal.
Questions people ask
- Where does the name come from?
- Paul Morphy finished a game with it at the Paris opera in 1858 while watching the performance. It is probably the most replayed game in chess.