Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...Nf6/4. Nf3/4...dxc4/5. e4/5...Bb4

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) rnbqk2r/ppp2ppp/4pn2/8/1bpPP3/2N2N2/PP3PPP/R1BQKB1R
	Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 Bb4
	ECO code: D37
	Parent: Vienna variation

5...Bb4

Black pins the c3 knight, removing the only defender of the e4 pawn.

6. Bg5 is White's main response, pinning the f6 knight to the queen which indirectly defends the e4 pawn.

6. Bxc4 is a sideline, letting Black take the e4 pawn for faster development.

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 Bb4

	6
	Bxc4	=
	Bg5	=

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) rnbqk2r/ppp2ppp/4pn2/8/1bpPP3/2N2N2/PP3PPP/R1BQKB1R
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 dxc4 5. e4 Bb4
ECO code: D37
Parent: Vienna variation