Topics: A brief look at the tactical elements of the Arsenal match, and why Liverpool needed to win, especially after all the tactical aspects favoured the home side. The main strengths and weaknesses of the 3-4-2-1, and why Rodgers is using this formation: the ability to pass the ball out from the back with extra confidence when the opposition presses; the ability to press as an efficient unit; the need for mobile deep-lying midfielders; the space between the wing-backs and the side centre-backs, and how to exploit it.