For one I don't think Chelsea defended very well at all last night. Nor played well on the counter either. They had ONE chance all game and they scored only because Ramires mishit his cross. And they were torn apart on several ocassions despite defending with 11 players throughout.
Barcelona had enough 100 pct chances to win four games and they'll make it count at home. Chelsea needs to score at least two but more likely three or four to progress. That will not happen, football will win alongside Barca come Tuesday next.
It's football and everything can happen but in 99 out of a 100 games Barca will turn over this rather bleak-looking Chelsea side at Camp Neu.