411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nc3/3...Nf6/4. Nf3/4...e6/5. Bg5/5...h6/6. Bh4/6...dxc4/7. e4
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Anti-Moscow Anti-Moscow D43
7. e4
White takes control of the center, opening up the light-squared bishop to recapture the c pawn.
The immediate /7...b5/ allows White to play 8. e5, transposing into the Botvinnik variation.
Black's main response is to first play the in-between move /7...g5/, forcing White to drop back the dark-squared bishop to g3.
Theory table
all 7. ... g5 8. Bg3 b5 Botvinnik variation 7. ... b5
References
Semi-Slav Defence Anti-Moscow_Variation:_5...h6_6.Bh4_dxc4