Aggressive Chess Openings (2012)

When white castles queenside, black attacks with the b- and a-pawns as well as the thematic exchange sac Rc8xNc3 bxc3, ruining the queenside pawn structure. Black has entered an assymetric position where white has to find dynamic plans to compensate for the material loss. Black will try to win by launching an attack on the white King, after developing with Bc8-b7, Qd8-b6 and O-O-O.

Source: chess.stackexchange.com