Chess puzzle (Advantage)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Zeller_Defense
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Bf5 4. f3 exf3 5. Qxf3 Bxc2 6. Qxb7 Nd7 7. Bb5 Bf5
8. Nf3 Nf6 9. O-O g6 10. Ne5 Bg7 11. Nxd7 Bxd7 12. Bxd7+ Nxd7 13. Nd5 O-O 14.
Be3 Nb6 15. Nxc7 Bxd4 16. Bxd4 Qxd4+ 17. Kh1 Nc4 *
Position (FEN): r4rk1/pQN1pp1p/6p1/8/2nq4/8/PP4PP/R4R1K w - - 2 18
White to move.
Themes:  Middlegame  
Puzzle rating: 1707
Best move: Nxa8