Black plays and wins in 5 moves https://lichess.org/leDuEqdY/black
1... Nb5 2. Kb1 Kc3 3. Ka2 Kc2 4. Ka1 Bb2+ 5. Ka2 Nc3#
The analysis board does a very similar checkmate in 5 moves
1... Bc1 2. Kb1 Ne2 3. Ka2 Kc2 4. Ka1 Bb2+ 5. Ka2 Nc1#
Source:
https://www.amazon.com/Chess-Puzzles-Advanced-Expert-Level/dp/B0917YQZP1