Chess puzzle (Checkmate)
Opening: French_Defense, French_Defense_Rubinstein_Variation
Moves: 1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. d5 Ngf6 6. dxe6 Nxe4 7. exd7+ Qxd7
8. Bd3 Bb4+ 9. Kf1 Nc5 10. Qe2+ Qe6 11. a3 Nxd3 12. Qxd3 *
Position (FEN): r1b1k2r/ppp2ppp/4q3/8/1b6/P2Q4/1PP2PPP/R1B2KNR b kq - 0 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 402
Best move: Qe1#