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. Ndb5 d6 7. a4 a6 8. Na3
Nd4 9. Be3 Qb6 10. Nc4 Qc5 11. Bxd4 exd4 12. Nd5 Nxd5 13. exd5 Qxd5 14. Qd3 Be7
15. O-O-O Bf6 16. Nb6 Qa2 17. Nxa8 Bg5+ 18. Rd2 *
Position (FEN): N1b1k2r/1p3ppp/p2p4/6b1/P2p4/3Q4/qPPR1PPP/2K2B1R b k - 2 18
Black to move.
Themes: Pin Middlegame Mate in 1 
Puzzle rating: 912
Best move: Qa1#