Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...Bf5/4. Bd3/4...Bxd3/5. Qxd3/5...Nd7

=Caro-Kann Defence - Advance Variation=

This move allows white to play 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
.

1.e4 c6 2.d4 d5 3.e5 Bf5 4.Bd3 Bxd3 5.Qxd3 Nd7