[Event "Mentor, 1977"] [White "Leonid Shamkovich"] [Black "Larry Chistiansen"] [FEN "6r1/p5bk/4N1pp/2B1p3/4Q2N/8/2P2KPP/q7 w - - 1 0"] %Hidden=1 1. Ng5+ hxg5 2. Qxg6+ Kh8 3. Qh5+ Bh6 4. Qxh6#