411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. f3/3...e6/4. Nc3/4...Bb4
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Caro-Kann Fantasy Variation B12 Caro-Kann → 2...d5
4... Bb4 · Caro-Kann Fantasy Variation
Black asks the question of how White is going to continue developing. There are quite a few alternatives here. White may try to get in 5. Bf4, Qd3 and O-O-O, or 5. Ne2, shoring up c3 and d4.
Theory table
5. Bf4 5. Bd2 5. Ne2
References
See also
Caro-Kann