So is the offside rule that you're offside if you make a movement towards the ball?

[eastgermanautos]

If so, how the f*ck could anyone possibly claim it was onside when Ramsey clearly made a movement towards the ball before leaving it to Sanchez?

Even at the time it happened I was absolutely furious at Ramsey for not leaving it, as he was clearly offside by a mile and I could see Sanchez steaming through...

My understanding of the offside rule is far from comprehensive. But if it's a question of touching the ball, how can it also be a question of one's *intention to touch the ball? You touch it or you don't. Kind of like you can't be half-pregnant.