The Tal Variation 4. h4 is one of the less popular attacks against the Advance Variation of the Caro-Kann Defense 1. e4 c6 2. d4 d5 3. e5 ♝f5, but it definitely belongs to the aggressive category. It was popularized by the eighth World Chess Champion Mikhail Tal, and it can become a dangerous weapon in an attacking player’s hands, so it’s probably good to know something about it.