Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...Nf6/4. Nf3/4...dxc4/5. e4

Vienna variation
	a b c d e f g h 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 a b c d e f g h
	Position in Forsyth-Edwards Notation (FEN) rnbqkb1r/ppp2ppp/4pn2/8/2pPP3/2N2N2/PP3PPP/R1BQKB1R
	Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4
	ECO code: D37
	Parent: Vienna variation

5. e4

White takes up the center and opens up the light-squared bishop to recapture the pawn on c4.

Black can choose to go into the sharp mainline with 5...Bb4 or to hang onto the pawn a little longer with 5...b5.

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4

	5
	... Bb4
	... b5

Vienna variation
a b c d e f g h 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 a b c d e f g h
Position in Forsyth-Edwards Notation (FEN) rnbqkb1r/ppp2ppp/4pn2/8/2pPP3/2N2N2/PP3PPP/R1BQKB1R
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4
ECO code: D37
Parent: Vienna variation