Chess puzzle (Checkmate)
Opening: English_Opening, English_Opening_Symmetrical_Variation
Moves: 1. d4 Nf6 2. c4 c5 3. Nf3 e6 4. Nc3 cxd4 5. Nxd4 b6 6. Ndb5 d6 7. Bf4 e5 8. Bg5
Be6 9. Bxf6 gxf6 10. Nd5 Na6 11. Qa4 Nc5 *
Position (FEN): r2qkb1r/p4p1p/1p1pbp2/1NnNp3/Q1P5/8/PP2PPPP/R3KB1R w KQkq - 4 12
White to move.
Themes: Double Check Opening Mate in 1 
Puzzle rating: 1202
Best move: Nbc7#