Mate in 5 Exercise 65
Black plays and wins in 3 moves https://lichess.org/k99mCOHd/black
1... b2 2. Re1 Kb3 3. Rg1 a2#

The analysis board does checkmate in 5 moves
1... a2+ 2. Kb2 Rd2+ 3. Ka1 Ka3 4. Rb1 axb1=Q+ 5. Kxb1 Rd1#
Source:

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