[Event "Munich, 1936"] [White "H Christoffersen"] [Black "Vladimir Petrov"] [FEN "6rk/Q2n2rp/5p2/3P4/4P3/2q4P/P5P1/5RRK b - - 0 1"] %Hidden=1 1... Rxg2 2. Qxd7 Qg3 3. Qg7+ Rxg7 4. Rxg2 Qxg2#