1.e4 e6 2.d4 d5 - See French Defense.
3.e5 - Advance Variation. White gains space but the pawn becomes a target.
White's plans: Maintain the pawn chain. Attack on the kingside.
Black's plans: Attack the base of the pawn chain with ...c5. Play ...Nc6 and ...f6.
Watch the moves to understand the opening sequence. Use the controls to replay or auto-play the variation.