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 "Unknown043"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A01"]
[FEN "7k/4NBpb/7p/q1n1p2P/1pQpPn2/3P2N1/P4PP1/6K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... b3 2. Qc1 ( 2. axb3 Qe1+ 3. Nf1 ( 3. Kh2 Qxf2 4. Ng6+ Bxg6 5. hxg6 Qxg2# ) 3... Ne2+ 4. Kh2 Qxf1 5. Qxc5 Qg1+ 6. Kh3 Nf4+ 7. Kh4 Qh2+ 8. Kg4 Qxg2+ 9. Kh4 Qh3# ) 2... Nfxd3 3. Qd1 b2 4. Ngf5 Qe1+ 5. Qxe1 Nxe1 6. Nh4 Nd7 ( { Black can try: } 6... b1=Q 7. Nhg6+ Bxg6 8. Nxg6+ Kh7 9. Nf8+ Kh8 10. Ng6+ Kh7 11. Nf8+ { Draw by repetition of position. } ) 7. f3 b1=Q { Black wins with a large
material advantage. } 0-1