Chess puzzle (Checkmate)
Moves: 1. c4 e5 2. Nf3 Nc6 3. g3 Nf6 4. Bg2 Bc5 5. a3 O-O 6. b4 Bd4 7. Ra2 e4 8. Ng1
d5 9. e3 Be5 10. cxd5 Qxd5 11. Rc2 Bg4 12. Ne2 a5 13. Rc5 Qd3 14. h3 Bxe2 15.
Qxe2 Qxb1 16. O-O axb4 17. Qb5 bxa3 18. Qxb1 a2 19. Qxb7 a1=Q 20. Qxc6 Ra6 21.
Qb5 Bd6 22. Bb2 Qa2 23. Ra1 Qxa1+ 24. Bxa1 Rxa1+ 25. Kh2 Bxc5 26. Qxc5 Rc8 27.
Qc2 Rca8 28. Bxe4 R8a7 29. Qb2 Nxe4 *
Position (FEN): 6k1/r1p2ppp/8/8/4n3/4P1PP/1Q1P1P1K/r7 w - - 0 30
White to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 660
Best move: Qb8#