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Chess Opening Theory/1. e4/1...c6/2. d4/2...Na6/3. Bxa6
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De Bruycker defence B12 Caro Kann → De Bruycker defence
3. Bxa6
White snap off Black's knight, thinking if 3...bxa6? they have ruined Black's pawn structure with doubled, isolated pawns on the a-file.
However, because Black has already opened up their queen with c6, they have the reply 3...Qa5+ 4. Nc3 Qxa6, and Black picks up the bishop pair without spoiling their pawns.
Theory table
References
See also