1...Qxc6 2.Qxc6 bxc6 3.Nc5 with a superior endgame, reminiscent of the encounter P.Benko-S.Reshevsky, US Championship, New York 1968.
White already has the better chances thanks to his strong knight and the sad bishop on c8.
A timely exchange that damages White's pawn structure and secures the f4-square for the knight.
Exploiting the mating threat in order to swap the active white queen as well.
The passed pawn has been neutralized, while the white rooks lack active prospects. Next Black may consider ...Rdb8 and ...Nd3 to put pressure on b2.
Transposing to an endgame where the knight will clearly outshine the bishop.