The Point Before the Point of Change

Say that you want to get to point D. Except this isn’t a linear path. All you know is where you are, where you want to be, and, maybe, what looks like the right direction. There are lots of dead-end point Bs and point Cs. In fact, it’s probably more like point G you want to get to, or point P, or point Z. But let’s stick with D for now. Identifying which point Bs connect to your point A doesn’t help. We need to know, first, what point Cs connect to your point D.