Chess puzzle (Advantage)
Opening: Bird_Opening, Bird_Opening_Dutch_Variation
Moves: 1. f4 d5 2. Nf3 c5 3. e3 Nc6 4. Be2 Nf6 5. O-O e6 6. c3 a6 7. d4 Ne4 8. Nbd2
Be7 9. Ne5 O-O 10. Bf3 f5 11. Qa4 b5 12. Qd1 Nxe5 13. fxe5 Bh4 14. Bxe4 fxe4
15. dxc5 Rxf1+ 16. Qxf1 Qg5 17. Qf4 Qxf4 *
Position (FEN): r1b3k1/6pp/p3p3/1pPpP3/4pq1b/2P1P3/PP1N2PP/R1B3K1 w - - 0 18
White to move.
Themes:  Middlegame  
Puzzle rating: 1066
Best move: exf4