Chess puzzle (Checkmate)
Opening: Modern_Defense, Modern_Defense_Kotov_Variation
Moves: 1. d4 d6 2. c4 g6 3. Nc3 Bg7 4. e4 Nc6 5. Be3 e5 6. d5 Nd4 7. g4 h5 8. g5 f5 9.
gxf6 Nxf6 10. Nge2 *
Position (FEN): r1bqk2r/ppp3b1/3p1np1/3Pp2p/2PnP3/2N1B3/PP2NP1P/R2QKB1R b KQkq - 1 10
Black to move.
Themes:  Opening Mate in 1 
Puzzle rating: 1263
Best move: Nf3#