Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. exd5/3...cxd5/4. Bd3/4...Nc6/5. c3/5...Nf6/6. Bf4/6...Bg4/7. Qb3/7...Qd7

= Caro-Kann Exchange Variation = Allowing the option of queenside castling, as well as Rc8 after castling kingside.

Nd2 is almost always played, although in a 1939 game, Aitken vs Flohr, white tried h3, and lost.

Theory table
.

1.e4 c6 2.d4 d5 3.exd5 cxd5 4. Bd3 Nc6 5.c3 Nf6 6. Bf4 Bg4 7. Qb3 Qd7