Chess puzzle (Advantage)
Opening: Horwitz_Defense, Horwitz_Defense_Other_variations
Moves: 1. d4 e6 2. c4 c6 3. e4 Ne7 4. Nf3 d5 5. cxd5 cxd5 6. e5 Ng6 7. Bd3 Nc6 8. Nc3
Be7 9. g3 O-O 10. h4 h6 11. h5 Nh8 12. Be3 f5 13. exf6 Bxf6 14. Qd2 Nf7 15. Nh4
Nxd4 16. O-O-O e5 17. Bxd4 *
Position (FEN): r1bq1rk1/pp3np1/5b1p/3pp2P/3B3N/2NB2P1/PP1Q1P2/2KR3R b - - 0 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1257
Best move: exd4