Chess puzzle (Checkmate)
Opening: Mexican_Defense, Mexican_Defense_Other_variations
Moves: 1. d4 Nf6 2. c4 Nc6 3. Nc3 e5 4. d5 Ne7 5. Nf3 Ng6 6. h4 h5 7. e4 Bc5 8. Bg5 c6
9. Na4 Bb4+ 10. Nc3 Qa5 11. Bxf6 Bxc3+ 12. bxc3 Qxc3+ 13. Ke2 *
Position (FEN): r1b1k2r/pp1p1pp1/2p2Bn1/3Pp2p/2P1P2P/2q2N2/P3KPP1/R2Q1B1R b kq - 1 13
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 942
Best move: Nf4#