Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Zukertort_Variation
Moves: 1. d4 d5 2. Nf3 e6 3. e3 Nc6 4. c4 dxc4 5. Bxc4 Nf6 6. Qa4 Bd6 7. Nc3 O-O 8. d5
exd5 9. Nxd5 Nxd5 10. Bxd5 Bd7 11. Be4 Nb4 12. Qb3 Be6 13. Qa4 a6 14. a3 b5 15.
Qd1 Rb8 *
Position (FEN): 1r1q1rk1/2p2ppp/p2bb3/1p6/1n2B3/P3PN2/1P3PPP/R1BQK2R w KQ - 2 16
White to move.
Themes:  Opening  
Puzzle rating: 1622
Best move: axb4