Chess puzzle (Advantage)
Opening: Philidor_Defense, Philidor_Defense_Hanham_Variation
Moves: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. dxe5 Nxe5 5. Nxe5 dxe5 6. Qxd8+ Kxd8 7. f4 exf4
8. Bxf4 Bc5 9. Nc3 f6 10. O-O-O+ Bd7 11. Nd5 Bg4 12. Nxf6+ *
Position (FEN): r2k2nr/ppp3pp/5N2/2b5/4PBb1/8/PPP3PP/2KR1B1R b - - 0 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1831
Best move: Bxd1