Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Harrwitz_Attack
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bf4 O-O 6. e3 Nbd7 7. Bd3 c5 8. O-O
cxd4 9. exd4 dxc4 10. Bxc4 Nb6 11. Bd3 Nbd5 12. Rc1 *
Position (FEN): r1bq1rk1/pp2bppp/4pn2/3n4/3P1B2/2NB1N2/PP3PPP/2RQ1RK1 b - - 4 12
Black to move.
Themes: Hanging Piece Opening  
Puzzle rating: 1362
Best move: Nxf4