The main point is that Black wants to make it more difficult for White to get his pawn to c4, thus establishing the famous "Maroczy Bind" formation (pawns on e4 and c4, creating a clamp on the d5 square).
Compare the c-pawn placement in these two lines:
vs:
Both are playable, but they each have their own ideas to familiarize yourself with.
If you don't already know about the Maroczy Bind, try reading up on it, or watching some YouTube videos about it. It's an interesting structure, with strategies for both sides ...
What is the point of Anti-Qxd4 Move-Order?
I was analizing the Sicilian Defense and stood upon the Anti-Qxd4 move-order and started wondering: what is this for?
The difference between the Chekhover Variation (4.Qxd4) and the Anti-Qxd4 is that when you play the Anti move-order, White gets their Knight on c3 and Black a Knight on f6.
The question I'm asking is if playing the Anti-Qxd4 does anything to me beside making me learn the Accepted Variation of Anti-Qxd4 Move-Order? I mean, is the Nc3 really that bad for White?