411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...c5/4. c3/4...Nc6/5. Nf3/5...cxd4/6. cxd4/6...Bg4/7. Be2/7...e6/8. O-O/8...Nge7
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Caro-Kann - Advance Variation, Botvinnik-Carls
8... Nge7 · Caro-Kann - Botvinnik-Carls Defence
The knight is aiming for f5. White can continue to defend the pawn with 9. Be3, but there are other moves here, such as 9. Nc3 or 9. Nbd2.
Theory table
9. Be3 9. Nbd2 9. Nc3
References
Caro-Kann