Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. Nc3 c6 4. e3 Bf5 5. c5 e6 6. Bd3 Bxd3 7. Qxd3 Be7 8. Nf3
O-O 9. O-O h6 10. Re1 b6 11. b4 Na6 *
Position (FEN): r2q1rk1/p3bpp1/npp1pn1p/2Pp4/1P1P4/2NQPN2/P4PPP/R1B1R1K1 w - - 1 12
White to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 1235
Best move: Qxa6