Chess puzzle (Checkmate)
Opening: Scotch_Game, Scotch_Game_Classical_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Bc5 5. Nxc6 Qf6 6. Qf3 Qxf3 7. gxf3 dxc6
8. Bc4 Bh3 9. Bf4 Bg2 10. Rg1 Bxf3 11. Rxg7 O-O-O 12. Be5 *
Position (FEN): 2kr2nr/ppp2pRp/2p5/2b1B3/2B1P3/5b2/PPP2P1P/RN2K3 b Q - 2 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 769
Best move: Rd1#