Chess puzzle (Checkmate)
Opening: English_Opening, English_Opening_Kings_English_Variation
Moves: 1. c4 e5 2. Nc3 Nf6 3. e4 Nc6 4. d3 Bb4 5. Ne2 O-O 6. g3 Nd4 7. a3 *
Position (FEN): r1bq1rk1/pppp1ppp/5n2/4p3/1bPnP3/P1NP2P1/1P2NP1P/R1BQKB1R b KQ - 0 7
Black to move.
Themes:  Opening Mate in 1 
Puzzle rating: 1338
Best move: Nf3#