Chess puzzle (Checkmate)
Opening: Nimzo-Indian_Defense, Nimzo-Indian_Defense_Classical_Variation
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. Nf3 dxc4 6. Ne5 Qxd4 7. Qa4+ Nc6 8.
Nxc6 Bxc3+ 9. bxc3 Qxc3+ 10. Kd1 Bd7 11. Qb4 Qxa1 *
Position (FEN): r3k2r/pppb1ppp/2N1pn2/8/1Qp5/8/P3PPPP/q1BK1B1R w kq - 0 12
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 635
Best move: Qe7#