1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 - QGD main line. 4...Be7 - Orthodox! Solid development.
White's plans: Play e3, Nf3, Bd3, O-O. Build pressure. Black's plans: Play ...O-O, ...Nbd7, ...h6. Solid defense.
Watch the moves to understand the opening sequence. Use the controls to replay or auto-play the variation.