If your opponent cannot do anything active, then don't rush the position; instead you should let him sit there, suffer, and beg you for a draw.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown528"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1r2r1k1/p4pp1/1qp2p2/4bB2/3n1P1P/1P5Q/PB5P/K2R2R1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nxb3+ ( { Black can try: } 1... Nc2+ 2. Kb1 Bxb2 3. Qg4 g6 4. Bxg6 Kf8 5. Bxf7 Kxf7 6. Qg7+ Ke6 7. Qd7# ) 2. axb3 ( { White can try: } 2. Qxb3 Bxb2+ 3. Kxb2 Qf2+ 4. Bc2 a5 5. Rgf1 Qe2 6. Rde1 Rxb3+ 7. axb3 Qxe1 8. Rxe1 Rxe1 { Black wins with a large material advantage. } ) 2... Bxb2+ 3. Kxb2 Re3 4. Qg2 Qxb3+ 5. Kc1 Qa3+ 6. Kc2 Qb2# 0-1