Chess Opening Theory/1. e4/1...c5/2. Nf3/2...d6/3. d4/3...cxd4/4. Nxd4/4...Nf6/5. Nc3/5...g6/6. Be3/6...Bg7/7. f3/7...O-O/8. Qd2/8...Nc6/9. Bc4/9...Bd7

= Sicilian Defense, Dragon, Main Line = Bd7 develops the bishop to its only good square at the moment. This move also has a second purpose: to free the c8 square for the rook. In the Open Sicilians, Black gets a half open c-file in exchange for White's half-open d-file, and Bd7/Rc8 is a good way to take advantage of it. Rc8 also threatens White's c4-bishop, forcing it to move out of danger with most commonly Bb3.