Chess puzzle (Checkmate)
Opening: Richter-Veresov_Attack, Richter-Veresov_Attack_Other_variations
Moves: 1. d4 Nf6 2. Nc3 d5 3. Bg5 c5 4. e4 dxe4 5. d5 a6 6. Qd2 Bf5 7. Nge2 Nbd7 8.
Ng3 Bg6 9. O-O-O h6 10. Bf4 Qa5 11. Kb1 O-O-O 12. Nb5 Qxd2 *
Position (FEN): 2kr1b1r/1p1nppp1/p4nbp/1NpP4/4pB2/6N1/PPPq1PPP/1K1R1B1R w - - 0 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1280
Best move: Na7#