Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 g6 3. e3 Bg7 4. Nd2 Nf6 5. Qe2 O-O 6. O-O-O Ne4 7. Nxe4 dxe4 8.
h3 Nc6 9. Qd2 a5 10. Bc4 Nb4 11. Kb1 Nd5 12. Bxd5 Qxd5 13. Ne2 Qb5 14. g4 c5
15. Rdg1 a4 16. a3 Be6 17. c3 Qb3 18. Nc1 cxd4 *
Position (FEN): r4rk1/1p2ppbp/4b1p1/8/p2ppBP1/PqP1P2P/1P1Q1P2/1KN3RR w - - 0 19
White to move.
Themes:  Middlegame  
Puzzle rating: 1171
Best move: Nxb3