I think maybe the black rook and bishop are interchanged here. Rook to e8 is just mate on the spot with the current piece placement, but if they were interchanged and the black rook was on a6 and the black bishop on c6, the puzzle would come to life. Is this a mistake?
Bien amigo @steemitgraven29 tu idea es genial porque plantea una linea de acción diferente. En verdad agradezco que nos apoyes aquí. El ejercicio pretende explicar como una decisión puede alterar un resultado que en un inicio es favorable. Me ha gustado tu aporte compañero.