For several years in the early days of the Emirates Stadium era, Chelsea loved to torture Arsenal. The roles have now been comprehensively reversed.
The Emirates Stadium bore witness to the Gunners thrashing the Blues 5-0 on Tuesday night, sending Mikel Arteta's men 30 points clear of their neighbours from the west of London.
These are two clubs heading in completely different directions and it's hard to see their trajectories changing.
Here are takeaways from a landmark night in north London.
If you either live in London or on the online world of social media, you'll know how loud Arsenal supporters can be when their team is in the ascendancy. This makes it all the more surprising that there's been such little fanfare about the season Martin Odegaard is having.
The Gunners captain is now rivalling the very peak years of former club favourite Mesut Ozil, maybe not in terms of his overall numbers, but certainly in regards to his control of an entire football pitch. He sees passes no others can, pathways no others will. Ending the night with only two assists did not do another incredible performance justice.
With their no clear favourite for this season's Player of the Year awards, why can't Odegaard win it?
He scores and he misses. He's a midfielder but he's not a midfielder. He's a striker but he's not a striker. He cost £65m but seldom shows why. He cost £65m and is starting to put up the numbers to back it up.
What exactly is Kai Havertz? Heaven knows, but at the very least he's a useful part of Arsenal and Arteta's vision, someone who can be additive to their performances and is less detrimental to them as he was in the autumn.
The gangly German has become an endearing figure to the Arsenal fandom too, further cementing that
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