Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. e3 e6 4. Bd3 c5 5. c3 c4 6. Bc2 Bd7 7. Nf3 Nc6 8. O-O
Nh5 9. Bg5 Be7 10. Bxe7 Qxe7 11. Na3 O-O 12. b3 a6 13. bxc4 *
Position (FEN): r4rk1/1p1bqppp/p1n1p3/3p3n/2PP4/N1P1PN2/P1B2PPP/R2Q1RK1 b - - 0 13
Black to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1581
Best move: Qxa3