Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. e5/3...Bf5/4. h4

=Caro-Kann Defence - Advance Variation, Tal Variation=

White gains space on the kingside. Unlike in other variations of the Advance Caro-Kann, Black cannot play 4...e6 immediately, as 5. g4 would trap the bishop.

Theory table
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1.e4 c6 2.d4 d5 3.e5 Bf5 4.h4