Smothered mate
From WikiChess
The white king can be put into smothered mate if black plays 1. ... Qg8+! 2. Rxg8 Nf7#
Smothered mate is a chess term used to describe a type of checkmate. Smothered mate occurs when a king is completely surrounded by his own pieces and is put into check by a knight. If the knight cannot be captured, the king is put into checkmate as a result, as it has nowhere to move.
