Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Austrian_Defense
Moves: 1. d4 d5 2. c4 c5 3. cxd5 cxd4 4. Nf3 Qxd5 5. Qxd4 Qxd4 6. Nxd4 g6 7. Nb5 Na6
8. N1c3 Bd7 9. Bf4 O-O-O *
Position (FEN): 2kr1bnr/pp1bpp1p/n5p1/1N6/5B2/2N5/PP2PPPP/R3KB1R w KQ - 6 10
White to move.
Themes: Queenside Attack Opening Mate in 1 
Puzzle rating: 918
Best move: Nxa7#