Anastasia's Mate is a checkmate delivered by rook and knight along one of the rook files (the a-file or the h-file). This checkmate was originally seen in the novel Anastasia und das Schachspiel (or Anastasia and the Game of Chess).
While several beautiful combinations can lead to the finale, the mate is just one move away in the position above. White has just delivered a check with the knight, causing Black to play Kh7 in an attempt to escape. However, White can checkmate Black by playing Rh3++. The rook attacks the entire h-file, while White's knight prevents the Black king from escaping to g8 or g6.
