Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Alapin_Variation
Moves: 1. e4 c5 2. c3 Nc6 3. d4 cxd4 4. cxd4 d5 5. exd5 Qxd5 6. Nf3 Bg4 7. Be2 Nf6 8.
Nc3 Qa5 9. O-O O-O-O 10. Qb3 Bxf3 11. Bxf3 Nxd4 *
Position (FEN): 2kr1b1r/pp2pppp/5n2/q7/3n4/1QN2B2/PP3PPP/R1B2RK1 w - - 0 12
White to move.
Themes: Queenside Attack Opening Mate in 1 
Puzzle rating: 1439
Best move: Qxb7#