Chess puzzle (Checkmate)
Opening: Vant_Kruijs_Opening, Vant_Kruijs_Opening_Other_variations
Moves: 1. e3 e5 2. b3 d6 3. Bb2 Nc6 4. c4 Nf6 5. Ne2 Nb4 6. a3 *
Position (FEN): r1bqkb1r/ppp2ppp/3p1n2/4p3/1nP5/PP2P3/1B1PNPPP/RN1QKB1R b KQkq - 0 6
Black to move.
Themes:  Opening Mate in 1, Smothered Mate 
Puzzle rating: 902
Best move: Nd3#