Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Morphy_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 a6 5. Ba4 b5 6. Bb3 Bc5 7. a3 h6 8. Nc3 d6
9. O-O Bg4 10. h3 Bh5 11. Nd5 Nd4 12. Nxd4 *
Position (FEN): r2qk2r/2p2pp1/p2p1n1p/1pbNp2b/3NP3/PB1P3P/1PP2PP1/R1BQ1RK1 b kq - 0 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1563
Best move: Bxd1