Chess Opening Theory/1. e4/1...b6/2. d4/2...Bb7/3. Bd3/3...Nf6

This continues pressuring on e4. White adds a defender; most likely 4. Qe2, 4. Nd2 or 4. f3.

• Nd2 defends the pawn and solidifies the white center -- it also allows Black to create a center of his own. Position is nearly equal.
• f3 leads to Nc6, pressuring the d4 pawn. This leads to a huge amount of central tension.