Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Lasker-Pelikan_Variation
Moves: 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Nxc6 dxc6 7. Qxd8+ Kxd8
8. Bg5 Be7 9. Bc4 Rf8 10. O-O-O+ Kc7 11. f4 exf4 12. Bxf4+ Kb6 13. b4 Bg4 *
Position (FEN): r4r2/pp2bppp/1kp2n2/8/1PB1PBb1/2N5/P1P3PP/2KR3R w - - 1 14
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1401
Best move: Na4#