Chess puzzle (Checkmate)
Opening: Englund_Gambit_Declined, Englund_Gambit_Declined_Reversed_Krebs
Moves: 1. Nf3 e5 2. d4 e4 3. Nfd2 e3 4. fxe3 Bd6 5. Nf3 Nf6 6. Nbd2 c6 7. h3 *
Position (FEN): rnbqk2r/pp1p1ppp/2pb1n2/8/3P4/4PN1P/PPPNP1P1/R1BQKB1R b KQkq - 0 7
Black to move.
Themes:  Opening Boden's Mate, Mate in 1 
Puzzle rating: 927
Best move: Bg3#