Knight endgames can be very tricky, especially when there are passed pawns involved.
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[Event "rated untimed match"]
[Site "Stavanger"]
[Date "2013.??.??"]
[Round "?"]
[White "Carlsen, Magnus"]
[Black "Hao, Wang"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "7Q/8/8/8/5Pp1/4k3/5q2/7K b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qf1+ ( { Black can try: } 1... Qxf4 2. Qc3+ Kf2 3. Qc2+ Kg3 4. Qg2+ Kh4 5. Qf2+ Kg5 6. Qxf4+ Kxf4 7. Kg2 g3 8. Kg1 Kf3 9. Kf1 g2+ 10. Kg1 Kg3 { Stalemate draw. } ) ( { Black can also try: } 1... Kxf4 2. Qe5+ Kf3 3. Qg3+ Ke2 4. Qe3+ Kf1 5. Qh3+ Ke2 6. Qd3+ Ke1 7. Qg3 Ke2 8. Qd3+ Ke1 9. Qg3 Kf1 10. Qh3+ { Black cannot stop the checks. Draw. } ) 2. Kh2 g3+ 3. Kxg3 Qg1+ 4. Kh3 Qh1+ 5. Kg4 Qxh8 { Black wins with a large material advantage. } 0-1