[Event "Vilnius, 1978"] [White "Gerardo Lebredo"] [Black "Tigran V Petrosian"] [FEN "5r1k/p5p1/1p3n1p/1Pp5/2RPp3/P3P2P/2Q3PK/2N1q3 b - d3 0 1"] %Hidden=1 1... Ng4+ 2. hxg4 Rf1 3. Qf2 Qxf2 4. d5 Qh4#