Fish Tail Checkmate:

The Fish Tail Mate is a checkmate involving the Queen and another supporting piece. (in this example - a rook). The theme of this checkmate is that - The king is initially in a smothered position since he's blocked on both sides by his own pieces, and white lures the king a square foward before delivering the final blow. It's almost as if the two pieces blocking in the king - become the Fish tail of the king. Here, after Rxd7+, the king is forced to d7, and the Queen comes inside to d6 with a checkmate. The Black king is smothered by his own tail and can't escape to any other squares which the queen protects.