Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Morphy_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Nc3 Bc5 6. h3 d6 7. d3 h6 8. Qe2
Bd7 9. Be3 Bxe3 10. Qxe3 b5 11. Bb3 O-O 12. g4 Na5 13. g5 Nxb3 14. gxf6 *
Position (FEN): r2q1rk1/2pb1pp1/p2p1P1p/1p2p3/4P3/1nNPQN1P/PPP2P2/R3K2R b KQ - 0 14
Black to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1703
Best move: Nxa1