Away goals can kill you in knockout competitions and after seeing Chelsea manage to get one in the League Cup, Liverpool were unwilling to let that happen again.
By keeping a clean sheet and making sure their back four were protected and even when they had to actually defend, that they did it well, they managed to keep Besiktas and Demba Ba out.
The second leg now becomes so much easier and Brendan Rodgers will be fully aware they are now in the driving seat.