The King is a fighting piece. Use it!
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[Event "rated untimed match"] [Site "?"] [Date "1975.??.??"] [Round "?"] [White "Farago"] [Black "Hazai"] [Result "0-1"] [BlackElo "0"] [FEN "2r3k1/1p2rpbp/2bp1qp1/p1n5/2P5/1P4N1/P1QN1PPP/1R2RBK1 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Qxf2+ 2. Kxf2 Bd4+ 3. Re3 Rxe3 4. Ne2 ( { White dare not try: } 4. Qd1 Re5# ) ( 4. Kg1 Rc3+ 5. Kh1 Rxc2 { Black wins with a large material advantage. } ) 4... Nd3+ 5. Qxd3 ( 5. Kg1 Rxe2+ 6. Kh1 Nf2+ 7. Kg1 Ne4+ 8. Kh1 Rxd2 9. Qc1 Nf2+ 10. Kg1 Nd3+ 11. Kh1 Nxc1 12. Rxc1 { Black wins with a large material advantage. } ) 5... Rxd3+ 6. Ke1 Re8 { Black wins with a large material advantage. } 0-1