It is a forward pass if: the arms of the player passing the ball move towards the opposition's dead-ball line.
Except: in a strong adverse wind, when the ball is blown backwards after leaving the hands?
another two sentence definition but again different from all the rest .. and OB disagrees with it.
I rest my case. Its a complex Law that is very difficult to sum up (and which, amazingly, we don't even al agree on)