Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Austrian_Defense
Moves: 1. d4 d5 2. c4 c5 3. dxc5 Qa5+ 4. Nc3 Qxc5 5. Qxd5 Qb6 6. Be3 Qxb2 7. Qb5+ Qxb5
8. Nxb5 Na6 9. O-O-O Bd7 10. Bf4 O-O-O *
Position (FEN): 2kr1bnr/pp1bpppp/n7/1N6/2P2B2/8/P3PPPP/2KR1BNR w - - 5 11
White to move.
Themes: Queenside Attack Opening Mate in 1 
Puzzle rating: 729
Best move: Nxa7#