The Sicilian with 2...d6 arises after 1.e4 c5 2.Nf3 d6. ECO code: B50.

The most common Sicilian move order, preparing for the Open Sicilian after 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3. Black's choice of 5th move determines the specific variation: 5...a6 (Najdorf), 5...g6 (Dragon), 5...Nc6 (Classical), or 5...e6 (Scheveningen). This move order leads to the richest and most deeply analysed positions in all of chess opening theory.