FoxyChess › Checkmates › Triangle Mate
Triangle Mate
A queen and rook form a triangle with the king. The queen gives check from a diagonally neighbouring square, and the rook protects it while sealing off the escape squares.
How to spot it
With a queen and rook close to the enemy king, look for a queen check that the rook can protect along the rank or file.
How it arises
A queen and rook arrive close to a king on the edge of the board. The queen checks from a square diagonally next to the king, and the rook on the same rank protects it and covers the escape squares.
A worked example
1.Qd7#. The rook on f7 protects the queen along the rank and covers f8; the queen covers d8, e7 and e8's neighbours.
How to defend against it
With the enemy queen and a rook near your king, keep a piece that can block the seventh rank, and keep the king off the edge if you can.
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