For the second leg, I think there is still hope for Chelsea. But if the opponent decides to make a full defensive strategy then well this will be very difficult for Chelsea. But if the opponent is a little greedy and continues to play with an offensive strategy then I think Chelsea will have a chance to win and of course they will have to score more than 1 goal. But even then, Chelsea can improve their very blunt attack line so that it becomes sharper.
Actually Chelsea have good performance last night and dominance with ball possession until shots on target, but Middlesbrough can manage on first half from Hayden Hackney make their chance are large on second leg.
Chelsea must all out on second leg match in front of their fans, get advantage with playing home at second leg must win above two goals and has chance qualify to final because will be the first trophy for Pochettino as first season as Chelsea manager.