Best response to the Sicilian Defense: Richter-Rauzer Variation, Rauzer Attack (B65)

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4 Nxd4 · White to move

What is the best response to the Sicilian Defense: Richter-Rauzer Variation, Rauzer Attack (1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O O-O 9. f4 Nxd4)? White to move. See the top replies ranked by opening theory and real-game results, starting with Qxd4.

The main theoretical reply is Qxd4, reaching the Sicilian Defense: Richter-Rauzer Variation, Classical Variation.