Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Closed
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Re1 Be7 7. h3 O-O 8. c3
Bd7 9. d4 b5 10. Bc2 Na5 11. Na3 exd4 12. cxd4 d5 13. e5 Bxa3 *
Position (FEN): r2q1rk1/2pb1ppp/p4n2/np1pP3/3P4/b4N1P/PPB2PP1/R1BQR1K1 w - - 0 14
White to move.
Themes:  Middlegame  
Puzzle rating: 1673
Best move: exf6