[Event "Petropolis, 1973"] [White "Lajos Portisch"] [Black "Shimon Kagan"] [FEN "6rk/3b3p/p2b1p2/2pPpP2/2P1B3/1P4q1/P2BQ1PR/6K1 w - - 1 0"] %Hidden=1 1. Rxh7+ Kxh7 2. Qh5+ Kg7 3. Bh6+ Kh7 4. Bf8#