Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Normal_Defense
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. e3 Be7 5. Bd3 O-O 6. f4 c5 7. Nf3 Nc6 8. O-O a6
9. cxd5 Nxd5 10. e4 Ndb4 11. a3 Nxd4 *
Position (FEN): r1bq1rk1/1p2bppp/p3p3/2p5/1n1nPP2/P1NB1N2/1P4PP/R1BQ1RK1 w - - 0 12
White to move.
Themes:  Opening  
Puzzle rating: 1794
Best move: axb4