Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...Bf5/4. Nc3

=Caro-Kann Defence - Advance Variation=

A sounder response than 4. Bd3, and more ambitious than 4. Nf3, 4. Nc3 has helped revitalize the Advance Variation of the Caro-Kann.

It is almost always met with 4...e6, with black aiming ultimately to play c5.

Theory table
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1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3