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. Bh4/8...g5/9. Nxg5
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Botvinnik variation D44 Botvinnik variation
9. Nxg5
White sacrifices their knight temporarily. Black should simply recapture with /9...hxg5/.
/9...Nd5/? doesn't work because of White's response 10. Nxf7! and Black can't avoid losing material.
Theory table
all 9. ... hxg5 10. Bxg5 Alatortsev System 9. ... Nd5 10. Nxf7 Qxh4 11. Nxh8 ++
References
See also