That's not the intended solution but in case it turns out it wins just as fast (which I fear!) :-) , you will get the 100 % upvote as well as @udow.

After 1. ... Rb8 2. c7 Rh8 3. Bb7+ Kd3 4. Bf3 could be a tougher defence (I will have to examine that when I have more time).

I have a more forced first move in mind. Can you find it? (If your side solution works I will try to modify the problem in a way that only one solution is possible).