Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Colle_System
Moves: 1. d4 d5 2. Nf3 Nf6 3. e3 Bg4 4. Be2 Nc6 5. O-O Qd7 6. Nbd2 g6 7. c4 Bh6 8.
cxd5 Nxd5 9. h3 Bxh3 10. Ne4 Bg4 11. Bc4 O-O-O 12. Bxd5 *
Position (FEN): 2kr3r/pppqpp1p/2n3pb/3B4/3PN1b1/4PN2/PP3PP1/R1BQ1RK1 b - - 0 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1708
Best move: Qxd5