Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_London_System
Moves: 1. d4 Nf6 2. Bf4 d5 3. Nf3 Nc6 4. Nbd2 Bf5 5. c3 h6 6. e3 e6 7. Be2 Bd6 8. Bg3
Bxg3 9. hxg3 Qe7 10. Qb3 O-O-O 11. Ba6 *
Position (FEN): 2kr3r/ppp1qpp1/B1n1pn1p/3p1b2/3P4/1QP1PNP1/PP1N1PP1/R3K2R b KQ - 4 11
Black to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1054
Best move: bxa6