Chess puzzle (Checkmate)
Opening: Rat_Defense, Rat_Defense_English_Rat
Moves: 1. d4 d6 2. c4 e5 3. dxe5 dxe5 4. Qxd8+ Kxd8 5. Nf3 f6 6. Nc3 c6 7. Bd2 Be6 8.
b3 Kc7 9. O-O-O Nd7 10. g3 a5 11. Ne4 Bf5 12. Nc3 *
Position (FEN): r4bnr/1pkn2pp/2p2p2/p3pb2/2P5/1PN2NP1/P2BPP1P/2KR1B1R b - - 3 12
Black to move.
Themes:  Middlegame Boden's Mate, Mate in 1 
Puzzle rating: 743
Best move: Ba3#