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...dxc4/6. e4/6...b5/7. e5/7...h6/8. Bh4
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Botvinnik variation D44 Botvinnik variation
8. Bh4
White retains the pin on Black's knight, threatening to take it with the pawn. Black must respond adequately with /8...g5/, removing the bishop from the diagonal.
Theory table
all 8. ... g5 9. Nxg5 hxg5 10. Bxg5
References
See also