Chess puzzle (Checkmate)
Opening: Slav_Defense, Slav_Defense_Other_variations
Moves: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Bg5 Bf5 5. Bxf6 exf6 6. cxd5 cxd5 7. Qb3 Nc6 8.
Qxb7 Nxd4 9. Nxd5 Nc2+ 10. Kd2 Nxa1 11. Qc6+ Bd7 12. Nc7+ Ke7 *
Position (FEN): r2q1b1r/p1Nbkppp/2Q2p2/8/8/8/PP1KPPPP/n4BNR w - - 4 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 2014
Best move: Qc5#