Black plays and wins in 4 moves https://lichess.org/jJhH68WF/black
1... Ra2+ 2. Kb1 Bd3+ 3. Kc1 Ra1+ 4. Rb1 Rxb1#
The analysis board does checkmate in 5 moves
1... Rf5 2. Rb7 Ra5+ 3. Kb1 Bd3+ 4. Kc1 Ra1+ 5. Rb1 Rxb1#
Source:
https://www.amazon.com/Chess-Puzzles-Advanced-Expert-Level/dp/B0917YQZP1
