The instructions Liverpool coach Ronnie Moran would issue if any player asked him how best to win a football match were: 'Work it out for yourself son', though even he would have been perplexed to see Arsenal play West Ham on Sunday.
The Premier League leaders employed a form of tactical chaos theory, a constantly evolving series of formations which made the task of writing out their line-up a virtually redundant exercise.
In the first half, Mikel Arteta's side played 2-2-4-2. In the second half it was 2-3-1-1-2-1. Martin Odegaard operated higher up the field than Gabriel Jesus, who was often found on the ball deep in his own half.