Chess puzzle (Advantage)
Opening: English_Defense, English_Defense_Other_variations
Moves: 1. d4 b6 2. Bf4 Bb7 3. Nf3 e6 4. e3 Nf6 5. Nbd2 c5 6. c3 Nc6 7. Bb5 a6 8. Ba4
b5 9. Bb3 c4 10. Bc2 d5 11. Ne5 Bd6 12. Nxc6 Bxc6 13. Bxd6 Qxd6 14. Nf3 O-O 15.
Ne5 Ne4 16. Qh5 f6 17. f3 fxe5 18. dxe5 Qc5 19. Ke2 Nf6 *
Position (FEN): r4rk1/6pp/p1b1pn2/1pqpP2Q/2p5/2P1PP2/PPB1K1PP/R6R w - - 3 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1370
Best move: exf6