Chess puzzle (Crushing)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 e6 3. e3 Nc6 4. Nf3 Bd6 5. Bg3 Nf6 6. c3 Bxg3 7. hxg3 Qe7 8.
Bd3 Bd7 9. Nbd2 O-O-O 10. b4 Kb8 11. a4 a6 12. b5 axb5 *
Position (FEN): 1k1r3r/1ppbqppp/2n1pn2/1p1p4/P2P4/2PBPNP1/3N1PP1/R2QK2R w KQ - 0 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1133
Best move: axb5