Mate in 5 Exercise 37

Black plays and wins in 4 moves https://lichess.org/iIN96wt1/black

1... Rb1+ 2. Ka2 Bc4+ 3. Ka3 Ra1+ 4. Ra2 Rxa2#

The analysis board does a less aggressive checkmate in 5 moves

1... Re6 2. Rg2 Re1+ 3. Ka2 Bc4+ 4. Ka3 Ra1+ 5. Ra2 Rxa2#

Source:

This publication is in my collection "500 chess puzzles. Mate in 5. Advanced & Expert Level."