Sicilian Defense: Old Sicilian Variation

Sicilian Defense - 1.e4 c5 (Variations, Move Orders, Purpose) - PPQTY

Every variation of the Sicilian Defense : r/chess

Sicilian Defense - A Total Guide (with White's Response)

Sicilian Defense, PDF, Abstract Strategy Games

Sicilian Defense: Hyperaccelerated old variation : r/lichess

Sicilian Defense: O'Kelly Variation: W. John Lutes: 9780945470267: : Books

Stomping the Sicilian Defense - EMPIRE CHESS

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

Portisch on the Sicilian Defense: 3 Things to Learn - TheChessWorld

Encyclopaedia: Modern Chess Opening - Sicilian Defence by Alexander Kalinin (editor) - First - 1996 - from The Book Collector ABAA, ILAB, TBA (SKU: BSC0444)