SCID
It turns out that the comment editor of SCID has a lot more possibilities with a few educated guesses. [%draw C,b6,royalBlue3][%draw C,f5,firebrick][%draw B,b5,royalBlue3][%draw A,c5,royalBlue3][%draw A,e6,firebrick][%draw B,f6,firebrick]
I have not failed. I've just found 10,000 ways that won't work.