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Elneny and Xhaka are flat and pretty non creative. but they playing give a bit more strength to defense. also there was an interesting change in formation when attacking. Tierney was playing in the back 3 when defending but when attacking he was a lot in the position as if we were playing back 4 (he was going forward a lot)

Arteta changed the mindset of the team when defending. everyone plays defense, and we are not falling apart like we used to.

Yeah it was really nice to watch us defend so valiantly. The arrangement on the left side is to cater for Auba's attacking need.
When eereyout of position, we operate a back five, with Ainsley dropping deep to join the defenders, while in attack, we basically have two wing backs, but Tierney more central and Ainsley operating on the flank. If you watch Auba's goal against Liverpool and the one he scored yesterday, you'll find that they were identical. Both goals had Tierney and Ainsley overlapping.

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It is an interesting tactics that gives us more protection at the back and doesn't reduce our attack

this is literally the same :D