Chess puzzle (Checkmate)
Opening: Pirc_Defense, Pirc_Defense_Other_variations
Moves: 1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Be3 Bg7 5. Qd2 a6 6. h3 b5 7. a3 Nc6 8. O-O-O
b4 9. axb4 Nxb4 10. f3 Bd7 11. Nb1 *
Position (FEN): r2qk2r/2pbppbp/p2p1np1/8/1n1PP3/4BP1P/1PPQ2P1/1NKR1BNR b kq - 2 11
Black to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 891
Best move: Na2#