Here is a typical sacrifice to bring about Blackburne’s mate. White has control over the long diagonal and a knight on g5. He can’t open the g-file for a heavy piece (Morphy’s mate), and he can’t get a heavy piece down onto h8 (our first theme in this chapter, associated with Anderssen). But there is another way to take advantage of the c3 bishop’s powers, and that is to get the light-squared bishop to h7. The g6 pawn must be pulled out of the way, so naturally White takes what it protects: 1. Qxh5, requiring g6xQ to avoid mate with Qh7 or Qh8—but now 2. Bh7 mates anyway. The signatures of the idea are the two bishops raking the king’s position and the White knight stationed on g5. The dark-squared bishop and the knight almost are enough by themselves to mate; only g8 is left open by them, which is why the king’s bishop must be added.