Chess puzzle (Checkmate)
Opening: Caro-Kann_Defense, Caro-Kann_Defense_Panov_Attack
Moves: 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nf3 Nc6 6. cxd5 Nxd5 7. Bc4 Bg4 8.
Qb3 Bxf3 9. Qxf3 Nxd4 10. Qe4 Nb4 11. Qxb7 Ndc2+ 12. Kf1 *
Position (FEN): r2qkb1r/pQ2pppp/8/8/1nB5/8/PPn2PPP/RNB2K1R b kq - 2 12
Black to move.
Themes:  Opening Mate in 1 
Puzzle rating: 811
Best move: Qd1#