By fernandoylet on Skatehive
White plays and wins in 3 moves https://lichess.org/cRorUP4t Qd5+ Kc7 2. Rb7+ Kc8 3. Qd7# The analysis board does a similar checkmate in 5 moves Qd5+ Ke7 2. Rb7+ Rc7 3. Rxc7+ Kf6 4. Rf7+ Kg6 5. Qf5# Source: This publication is in my collection "500 chess puzzles. Mate in 5. Advanced & Expert Level."