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. e4/7...g5
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Anti-Moscow Anti-Moscow D43
7...g5
Black attacks White's bishop again, forcing it to retreat to g3.
Unlike the Botvinnik variation, /8. Nxg5/? is a blunder in this position. After the sequence 8. Nxg5 hxg5 9. Bxg5 Black can defend the knight and break the pin with 9...Be7 and simply move the knight after e5.
Theory table
all 8. Bg3 b5
References
Semi-Slav Defence Anti-Moscow_Variation:_5...h6_6.Bh4_dxc4