Chess puzzle (Advantage)
Moves: 1. e4 e5 2. d3 Be7 3. c3 c5 4. Nf3 Nc6 5. Na3 a6 6. Nc4 d6 7. h3 Nf6 8. g4 d5
9. exd5 Nxd5 10. Nfxe5 Nxe5 11. Nxe5 Qc7 12. Nf3 O-O 13. Bg2 b6 14. O-O Bb7 15.
Re1 Rfe8 16. Nh2 Rab8 17. a4 Bd6 18. Rxe8+ Rxe8 19. Nf1 Bf4 20. Bxf4 *
Position (FEN): 4r1k1/1bq2ppp/pp6/2pn4/P4BP1/2PP3P/1P3PB1/R2Q1NK1 b - - 0 20
Black to move.
Themes:  Middlegame  
Puzzle rating: 1326
Best move: Nxf4