Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. Nc3/3...dxe4/4. Nxe4/4...Bf5/5. Ng3/5...Bg6/6. h4/6...h6/7. h5

=Caro-Kann=

This move attacking the bishop again is inferior due to it wasting two tempi on moving the h-pawn.

Nimzowitsch Variation: 7...Bh7 8. Rh4!?
The Nimzowitsch Variation is a rare line of the Caro-Kann that develops the rook early but creates some complications for black.