Normalized range

I've got two numbers, A and B. I don't know which is bigger at the outset. I'm trying to work out a math function that will use the two numbers (without IF statements) and end in a result from 0 to 2, with 1 being the answer if A = B. If at all possible, it'd be awesome if this followed a 'normal distribution' curve (bell curve).
This is probably staring me in the face or something, but right now I'm blind to it.