Chess puzzle (Checkmate)
Opening: Old_Indian_Defense, Old_Indian_Defense_Czech_Variation
Moves: 1. d4 d6 2. Nf3 Nf6 3. c4 c6 4. Nc3 g6 5. e4 Qa5 6. Bd2 Qc7 7. d5 cxd5 8. cxd5
e5 9. Rc1 Qb6 10. Bg5 Bg7 11. Nb5 Nxe4 12. Nc7+ Kf8 13. Nxa8 *
Position (FEN): Nnb2k1r/pp3pbp/1q1p2p1/3Pp1B1/4n3/5N2/PP3PPP/2RQKB1R b K - 0 13
Black to move.
Themes: Attacking f2 or f7 Opening Mate in 1 
Puzzle rating: 1316
Best move: Qxf2#