Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Three_Knights_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Nc6 5. Bg5 Be7 6. e3 O-O 7. Be2 h6 8. Bh4
Ne4 9. Bxe7 Qxe7 10. cxd5 Qb4 11. Qc2 exd5 12. O-O Bf5 13. Bd3 Rfe8 14. Nxd5
Qd6 15. Nc3 *
Position (FEN): r3r1k1/ppp2pp1/2nq3p/5b2/3Pn3/2NBPN2/PPQ2PPP/R4RK1 b - - 2 15
Black to move.
Themes:  Middlegame  
Puzzle rating: 1657
Best move: Nb4