Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_London_System
Moves: 1. Nf3 Nf6 2. d4 d5 3. Bf4 e6 4. e3 c5 5. c4 Bd6 6. Nc3 Qb6 7. Bg3 O-O 8. Rb1
Nbd7 9. b4 cxb4 10. c5 Nxc5 11. dxc5 Qxc5 12. Na4 Qa5 *
Position (FEN): r1b2rk1/pp3ppp/3bpn2/q2p4/Np6/4PNB1/P4PPP/1R1QKB1R w K - 2 13
White to move.
Themes: Hanging Piece Opening  
Puzzle rating: 919
Best move: Bxd6