The hosts' lead looks set to make Chelsea even more motivated to win the match against Real Madrid, but still I think the odds are 50:50 for them to qualify for the semifinals. In a few seasons the English team looks stronger in the Champions League where Chelsea, Liverpool, Manchester City can get into the semifinals and even the final. Real Madrid won't be my favorite this season considering they don't look ready for a stronger opponent when the intensity of the opponent's attack is better than theirs. Real Madrid's defense is not good, we can see in their last match vs Barcelona.
You are right, they are just as strong. Mentality is the winner in this match. Of course Anceloti must not repeat the defensive strategy like the previous match. I think they have to dare to have the ball and press. Maybe if Madrid can't win at least they draw. That will benefit them for the 2nd leg at the Bernabeu later. They will feel better playing in their stadium, of course they will also have a better game. So the best strategy, Madrid must play well in both legs. Then the defeat to Barcelona should soon be forgotten other than that of course their motives will be different when playing at UCL.