I ve spoken with a keeper coach, some years ago about the goalies positioning.
The keeper should follow the move of the ball more than the player and the reasons goalies move closer to cover the near post, is because that they can efficiently cover every angle of the posts,equally, thats the idea behind it!
Just try to draw two imaginary lines from Amauri's position to each and every of our posts and place Buffon right in the middle, IMO Buffon was too close to the close post, he should be one more step to the left, if he was there, he could try and intercept that ball and i wouldnt say that shot was curly enough to go off the straight line with the long post, if it was, then indeed there was nothing Buffon could do, i still havent watched the game to a full resolution TV and i may be wrong here....
For the second goal, i didnt accuse Buffon, Fontana blocked a much harder ball from Treze, using his reflexes, good positioning and his luck.
Buffon wasnt there, the ball changed possession too fast and he wasnt in a place to react, it was 100% Chiellini's fault
But for the third goal i think Buffon could do, much much better than that and i believe, even you agree with me
Nice thought on punishing Chiellini,

but i m afraid that our team here took that blow, more than every other one, we lost our last chances for a direct CL qualification because of this!
Every one should try and do his best, our team is full of average material and a few champions, we expect from our champions to do the difference. Buffon yesterday had a sub par day, he conceded 3 goals and cleared one or two, that doesnt chances the fact, that he i still the best keeper on the world, but i am only worried of his current form and his back problems.