Chess puzzle (Crushing)
Opening: Rat_Defense, Rat_Defense_Small_Center_Defense
Moves: 1. e4 e6 2. d4 d6 3. Nc3 c6 4. Bd3 Nd7 5. Nf3 Qc7 6. O-O g6 7. a4 Bg7 8. Ne2 e5
9. c3 Ngf6 10. h3 O-O 11. Ng3 exd4 12. cxd4 c5 13. Be3 cxd4 14. Bxd4 Nc5 15.
Rc1 Qe7 16. e5 Nxd3 *
Position (FEN): r1b2rk1/pp2qpbp/3p1np1/4P3/P2B4/3n1NNP/1P3PP1/2RQ1RK1 w - - 0 17
White to move.
Themes:  Middlegame  
Puzzle rating: 1410
Best move: exf6