Some sacrifices are sound; the rest are mine.
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[Event "rated untimed match"]
[Site "Kecskemet"]
[Date "1968.??.??"]
[Round "?"]
[White "Bilek"]
[Black "Stein"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r1rk1/1b2bppp/p3p3/R3N3/2pB1P2/2P3qP/PP1Q2P1/5RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxd4 2. cxd4 Bb4 3. Qf2 ( { White can try: } 3. Ra3 Qxa3 4. bxa3 Bxd2 5. Nxc4 Bc3 { Black wins with a large material advantage. } ) ( { White dare not
try: } 3. Qxb4 Qxg2# ) 3... Qxf2+ 4. Kxf2 Bxa5 5. Nxc4 Bc7 { Black wins with a large
material advantage. } 0-1