Chess: Sicilian Defence Variations: Sicilian Defense - Anderssen Variation - Pin Variation - Jaffe Variation

Common Variations in the Open Sicilian : r/chess

In chess, what is a way to face the Sicilian as white without

Sicilian Defense, Pin Variation - GM Yasser Seirawan

Play the O'Kelly Sicilian

Why would White play 2.a3 as their 2nd move in the Sicilian Defense? It's not an accepted opening and I see no benefits. How would you go about strategizing a reply, as

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Sicilian Defense: Normal, Pin Variation

Chess openings: Sicilian (B40)

Experts vs. the Sicilian by Aagaard, Jacob

Chess Skills: The Bad Pin