Chess puzzle (Crushing)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Old_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 c6 6. O-O b5 7. Bb3 Nbd7 8. Nc3
a5 9. Bc2 Ba6 10. Re1 b4 11. Ne2 Be7 12. Ng3 Bb5 13. e4 a4 14. Be3 O-O 15. h3
Qc7 16. Rc1 Rfd8 17. Bb1 Nb6 18. Qc2 a3 19. e5 axb2 *
Position (FEN): r2r2k1/2q1bppp/1np1pn2/1b2P3/1p1P4/4BNNP/PpQ2PP1/1BR1R1K1 w - - 0 20
White to move.
Themes:  Middlegame  
Puzzle rating: 1661
Best move: exf6