411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. f3/3...e6/4. Nc3
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Caro-Kann Fantasy Variation B12 Caro-Kann → 2...d5
4. Nc3 · Caro-Kann Fantasy Variation
This can transpose into a Steinitz Variation of the French Defence with the moves 4. Nc3 Nf6 5. e5 Nfd7 6. f4 c5.
If Black wants to avoid this, 4... Bb4, pinning the knight, is a good alternative.
Theory table
4...Nf6 4...Bb4
References
See also
Caro-Kann