I would like to write a "game", where you can place an obstacle (red), and then the black dot tries to avoid it, and get to the green target.
I'm using a very easy way to avoid it, if the black dot is close to the red, it changes its direction, and moves for a while, then it moves forward to the green point.

How could I create a "smooth" path for the computer controlled "player"?
Edit: Not the smoothness is the main point, but to avoid the red blocking "wall" and not to crash into it and then avoid it.

How could I implement some path finding algorithm if I just have basically 3 points?
(And what would it make the things much more complicated, if you could place multiple obstacles?)