Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Other_variations
Moves: 1. e4 Nc6 2. d4 e6 3. c4 d5 4. exd5 exd5 5. c5 Qh4 6. Be3 Bf5 7. Nc3 O-O-O 8.
Nf3 Qe7 9. Bb5 Bg4 10. O-O Bxf3 11. Qxf3 Qe6 12. Ba4 Nf6 13. Bc2 Ne7 14. b4 Ng6
15. Bf5 Qxf5 16. Qxf5+ Kb8 17. a4 Ne7 18. b5 *
Position (FEN): 1k1r1b1r/ppp1nppp/5n2/1PPp1Q2/P2P4/2N1B3/5PPP/R4RK1 b - - 0 18
Black to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 899
Best move: Nxf5