Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Three_Knights_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. e3 O-O 6. h4 a6 7. Qd3 dxc4 8. Qc2
b5 9. a3 Bb7 10. Ng5 h6 11. e4 c5 12. e5 cxd4 *
Position (FEN): rn1q1rk1/1b2bpp1/p3pn1p/1p2P1N1/2pp3P/P1N5/1PQ2PP1/R1B1KB1R w KQ - 0 13
White to move.
Themes:  Opening  
Puzzle rating: 1422
Best move: exf6