Chess puzzle (Advantage)
Opening: London_System, London_System_Other_variations
Moves: 1. d4 Nf6 2. Bf4 g6 3. Nf3 Bg7 4. h3 O-O 5. e3 d5 6. c4 Nc6 7. c5 b6 8. b4 Nxb4
9. cxb6 cxb6 10. Qa4 Nc6 *
Position (FEN): r1bq1rk1/p3ppbp/1pn2np1/3p4/Q2P1B2/4PN1P/P4PP1/RN2KB1R w KQ - 2 11
White to move.
Themes: Hanging Piece Middlegame  
Puzzle rating: 689
Best move: Qxc6