Main motif of this puzzle: Epaulette mate
In epaulette mate, a queen or rook checkmates the king orthogonally. If it is a queen, it might not be next to the king. The two squares next to the king are blocked by its own pieces.
Learn more in this guide.
The hint button is in beta test. We recommend to use the button only after you've thought about the puzzle for some time without finding any idea.
Read more about the hint button in this blog post.