2024/11/13 DPA: "Mounted Knight, Batteries Included"

White to move:

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Material is equal.

Black's King has poor mobility so this puzzle will probably be about checkmate.

White has a Rook battery on the h file.

1. Rxg7 Kxg7  2. Rh7+ Kf8:  if something could guard f7, then 3. Rf7#.  But that doesn't exist so 3. Bh6#:  the Rook covers the 7th rank and the Knight controls e8 and g8 while the Bishop delivers checkmate.

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The key was recognizing the King's precarious position, how the Rook sac removed the only defender, how the Knight controlled e8 and g8, and how the 2nd Rook sealed the net for the Bishop.