White plays and wins in 5 moves https://lichess.org/bA9WZv7f
- Be3+ Kg3 2. Rxg5+ Kh3 3. Kf3 Kh2 4. Rxg6 Kh1 5. Rh6#
The analysis board does checkmate in 5 moves
- Be3+ Ke4 2. Bxg5 Kd4 3. Nb3+ Ke4 4. Nd2+ Kd4 5. Be3#
Source:
This publication is in my collection "500 chess puzzles. Mate in 5. Advanced & Expert Level."