Caro-Kann Defense: Breyer Variation, Stein Attack

The Caro-Kann Defense: Breyer Variation, Stein Attack is a chess opening classified under ECO code B10 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 8 moves: 1. e4 c6 2. d3 d5 3. Nd2 g6 4. Ngf3 Bg7 5. g3 e5 6. Bg2 Ne7 7. O-O O-O 8. b4. The resulting position leaves black to move.