Can someone explain to me why 8. Aa6 is an inaccuracy?

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Eldoblec73

https://www.chess.com/analysis/game/live/65158787123?tab=review Can someone explain to me why move 8. Aa6 is an inaccuracy?

eaglesoaring9_24

I didn't see an Aa6. I did see your Ba6 was an inaccuracy because you had nothing covering the piece

bollingerr

The computer says so