In the Sicilian opening, after 4. Nxd4, why is there no standard line 4… Nxd4? I'd think forcing white's queen to the center would give black good opportunities. - Quora
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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

I have seen this opening for white a ton recently against my Sicilian response to e4 after almost never seeing it. Looking for some guidance on what white is trying to do/what opening this is. Mid 1200s on chess.com. : r/chessbeginners
In chess, what is a way to face the Sicilian as white without having to learn much theory? - Quora
In the Sicilian, why does White's knight (1. e4 c5, 2. Nf3 d6, 3. d4 cxd4, 4. Nxd4 Nf6, 5. Nc3 Nc6) never take? - Quora
Sicilian Defense: Full Guide, Main Lines, Secondary Options

Sicilian Defense - A Total Guide (with White's Response)
In the Sicilian, why does White's knight (1. e4 c5, 2. Nf3 d6, 3. d4 cxd4, 4. Nxd4 Nf6, 5. Nc3 Nc6) never take? - Quora
In the Sicilian, why does White's knight (1. e4 c5, 2. Nf3 d6, 3. d4 cxd4, 4. Nxd4 Nf6, 5. Nc3 Nc6) never take? - Quora
What is a hybrid opening system for black against the E4 and D4? - Quora
What is the Swiss Gambit in chess? - Quora
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