Watched the whole telecast today. Richie Porte put the pressure on early at the start of the hill finish which ended the sprinters hopes. Then it was looking like Gerro and Cadel again until the Italian jumped both of them.
The top of the climb is less than a 5% gradient. I remember taking a mate up it for the first time when I'd been up it about half a dozen times before and I did the same thing to him, kept the pace high at the bottom where it's 14-16%, gapped him through the windy section by taking the flattest lines through the corners, then put it in the big dog with around 500m to go