Chess puzzle (Checkmate)
Opening: Modern_Defense, Modern_Defense_Pseudo-Austrian_Attack
Moves: 1. e4 d6 2. d4 g6 3. Nc3 Bg7 4. f4 Nd7 5. e5 c5 6. dxc5 Nxc5 7. exd6 Qxd6 8.
Qxd6 exd6 9. Nb5 Kd7 10. Be3 a6 11. Bxc5 dxc5 12. O-O-O+ Kc6 *
Position (FEN): r1b3nr/1p3pbp/p1k3p1/1Np5/5P2/8/PPP3PP/2KR1BNR w - - 2 13
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 849
Best move: Rd6#