Chess puzzle (Checkmate)
Opening: Vant_Kruijs_Opening, Vant_Kruijs_Opening_Other_variations
Moves: 1. e3 c6 2. b3 d5 3. Bb2 Nf6 4. Nc3 Bf5 5. d4 e6 6. Qd2 Bb4 7. O-O-O O-O 8. f3
a5 9. g4 Bg6 10. h4 h6 11. g5 hxg5 12. hxg5 Nh7 13. f4 a4 14. Qh2 axb3 15. axb3
Qa5 16. Bd3 Bxc3 17. Bxg6 Qa1+ 18. Bxa1 *
Position (FEN): rn3rk1/1p3ppn/2p1p1B1/3p2P1/3P1P2/1Pb1P3/2P4Q/B1KR2NR b - - 0 18
Black to move.
Themes: Queenside Attack Middlegame Mate in 1 
Puzzle rating: 1003
Best move: Rxa1#