Paris Saint-Germain came out victorious in the first leg of their Champions League semifinal against Arsenal, exiting North London with a 1-0 advantage courtesy of a goal from Ousmane Dembele in the fourth minute.

This will be a match that lives long in the memory, for players and fans alike. The unstoppable force of Barcelona, top scorers in this season’s Champions League, met the immovable object of Inter Milan,

Arsenal aim for a second title 18 years after their first against a Barcelona team looking for three in a row. We pick out some themes to watch in Lisbon on 24 May.