Chess puzzle (Checkmate)
Opening: Indian_Defense, Indian_Defense_London_System
Moves: 1. d4 Nf6 2. Nf3 e6 3. Bf4 c5 4. e3 Nc6 5. Nbd2 d5 6. c4 Qb6 7. b3 cxd4 8. exd4
Nxd4 9. Be3 Bc5 10. a3 Nxf3+ 11. Qxf3 d4 12. Bg5 Be7 13. Bxf6 Bxf6 14. Bd3 e5
15. O-O Be6 16. b4 O-O-O 17. Ne4 Bd7 18. c5 Qe6 19. Nd6+ Kb8 *
Position (FEN): 1k1r3r/pp1b1ppp/3Nqb2/2P1p3/1P1p4/P2B1Q2/5PPP/R4RK1 w - - 3 20
White to move.
Themes: Queenside Attack Middlegame Mate in 1 
Puzzle rating: 1047
Best move: Qxb7#