White plays and wins in 4 moves https://lichess.org/xr7RKULm
- Re7+ Kh8 2. Be6 Rb4 3. Kg6 Rb3 4. Re8#
The analysis board does checkmate in 5 moves
1.Re7+ Kh8 2. Re8+ Kh7 3. Bg8+ Kh8 4. Be6+ Kh7 5. Bf5#
Source:
This publication is in my collection "500 chess puzzles. Mate in 5. Advanced & Expert Level."