Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...Bf5/4. Bd3/4...Bxd3/5. Qxd3

=Caro-Kann Defence - Advance Variation=

Black has a number of options here. 5...e6 is probably safest, as 5...Nd7 allows the interesting pawn sacrifice, 6.e6 fxe6 7.f4. White will then look at moving the knights to d2, f3, g5 and e5, leaving black cramped and with a tough position.

Theory table
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1.e4 c6 2.d4 d5 3.e5 Bf5 4.Bd3 Bxd3 5.Qxd3