These are the moments when Chelsea make it seem barely plausible that they have based long parts of their season on the theory of chaos. They played here with character, resolve and togetherness and now have an outstanding chance of reaching the Champions League semi-finals at a time when their performances in the Premier League make it far from certain they will even qualify for the competition next season.Salomon Kalou's 75th-minute winner, made by Fernando Torres, certainly puts them in a position of command going into the second leg next Wednesday, when Benfica will need to be considerably better if they are to stand any chance of turning...