Chess puzzle (Checkmate)
Opening: Benoni_Defense, Benoni_Defense_Modern_Variation
Moves: 1. d4 c5 2. d5 e6 3. c4 Nf6 4. Nc3 d6 5. Bg5 e5 6. e4 g6 7. Be2 Bg7 8. h4 O-O
9. h5 h6 10. hxg6 hxg5 11. gxf7+ Kxf7 12. Bh5+ Ke7 13. Bg6 Bg4 14. f3 Bc8 15.
Qd2 Kd7 16. Bf5+ Kc7 17. Nb5+ Kb6 18. a4 a6 *
Position (FEN): rnbq1r2/1p4b1/pk1p1n2/1NpPpBp1/P1P1P3/5P2/1P1Q2P1/R3K1NR w KQ - 0 19
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1367
Best move: a5#