Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_French_Connection
Moves: 1. e4 Nc6 2. Nc3 e6 3. g3 d5 4. exd5 exd5 5. d4 Be6 6. Bg2 Nf6 7. Nge2 Bb4 8.
O-O Qd7 9. Re1 O-O 10. a3 Bxc3 11. Nxc3 h6 12. Ne2 Rfe8 13. Nf4 Re7 14. Nxe6
Rxe6 15. Be3 Rae8 16. Qd2 Ne4 17. Qd3 f5 18. f3 Nf6 19. Kf2 Ne4+ *
Position (FEN): 4r1k1/pppq2p1/2n1r2p/3p1p2/3Pn3/P2QBPP1/1PP2KBP/R3R3 w - - 3 20
White to move.
Themes:  Middlegame  
Puzzle rating: 848
Best move: fxe4