Mate in 5 Exercise 14
(Edited)
White plays and wins in 4 moves https://lichess.org/fg7BN7lB
- Nh5 Kh8 2. Kf7 Kh7 3. Nf6+ Kh6 4. Bf4#

The analysis board does checkmate in 5 moves
- Nf5 Kg8 2. Kg6 Kh8 3. Be7 Kg8 4. Nh6+ Kh8 5. Bf6#
Source:

https://www.amazon.com/Chess-Puzzles-Advanced-Expert-Level/dp/B0917YQZP1
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