Triangle mate (1 move)
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In triangle mate, a queen checkmates the king.
The queen is next to the king, and protected by a rook, which is two squares away, and also next to the king.
The queen, rook, and king form a triangle.
Examples
White can deliver triangle mate with Qb5#.
On the edge of the board, queen and rook already cover all the escape squares.
White can deliver triangle mate with Qd6#.
f7 is the only escape squared not covered by queen nor rook. Here it is blocked by Black's rook.
Related patterns
In triangle mate, the rook delivers checkmate, and is protected by the queen.
In lawnmower mate, two major pieces deliver checkmate on the edge of the board.