Chess puzzle (Checkmate)
Opening: Scandinavian_Defense, Scandinavian_Defense_Panov_Transfer
Moves: 1. e4 d5 2. exd5 Nf6 3. c4 c6 4. dxc6 Nxc6 5. Nf3 e5 6. d3 e4 7. dxe4 Qxd1+ 8.
Kxd1 Nxe4 9. Be3 Bg4 10. Be2 O-O-O+ 11. Kc2 Nb4+ 12. Kb3 a5 13. h3 Be6 14. Na3
Bd7 15. Ne5 *
Position (FEN): 2kr1b1r/1p1b1ppp/8/p3N3/1nP1n3/NK2B2P/PP2BPP1/R6R b - - 4 15
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1589
Best move: a4#