411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...e6/3. Nc3/3...Nf6/4. Nf3/4...dxc4/5. e4/5...Bb4/6. Bg5
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Vienna variation D37 Vienna variation
6. Bg5
White pins the f6 knight, indirectly defending the e4 pawn. Black's main option is 6...c5 striking at White's center.
Theory table
6...c5 7. Bxc4 6... ... 7. e5
References
See also