Chess puzzle (Checkmate)
Opening: Nimzo-Larsen_Attack, Nimzo-Larsen_Attack_Graz_Attack
Moves: 1. b3 d5 2. Ba3 Nf6 3. e3 e6 4. Bxf8 Rxf8 5. Nc3 Nc6 6. a3 Bd7 7. b4 Qe7 8. b5
Ne5 9. a4 Qb4 10. Nge2 Ne4 11. g3 *
Position (FEN): r3kr2/pppb1ppp/4p3/1P1pn3/Pq2n3/2N1P1P1/2PPNP1P/R2QKB1R b KQq - 0 11
Black to move.
Themes:  Middlegame Mate in 1, Smothered Mate 
Puzzle rating: 1403
Best move: Nf3#