411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. f3/3...e6/4. Nc3/4...Bb4/5. Bf4
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Caro-Kann Fantasy Variation B12 Caro-Kann → 2...d5
5. Bf4 · Caro-Kann Fantasy Variation
5...Ne7 is the most common reply here. Leaving the knight on b8 allows Black to attempt to solve the problem of the weak light-squared bishop by placing it on a6, protected by the knight.
Theory table
5... Ne7 5... Nf6
References
See also
Caro-Kann