It would, perhaps, be the defining irony of Arsène Wenger’s uneasy relationship with Chelsea if it turns out that when he finally devised a way of beating them it provoked a tactical shift that won the Blues the title. Since Chelsea switched to a back three when 3-0 down at half-time at the Emirates, they have conceded only once, winning seven Premier League games in a row. They passed one major test by coming from behind to beat Tottenham last week but on Saturday represents an even more severe examination as they go to Manchester City.
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