Chess puzzle (Checkmate)
Moves: 1. c4 e6 2. d4 Nf6 3. Nc3 Bb4 4. Bd2 b6 5. a3 Bxc3 6. Bxc3 Bb7 7. f3 d5 8. cxd5
exd5 9. Qc2 O-O 10. g4 c5 11. dxc5 bxc5 12. Bxf6 Qxf6 13. Nh3 Nd7 14. O-O-O d4
15. g5 Qb6 16. Nf2 c4 17. Ne4 c3 18. Bh3 cxb2+ 19. Qxb2 Rfc8+ 20. Kb1 Bxe4+ 21.
fxe4 Qg6 22. Qxd4 Rcb8+ 23. Ka1 Qa6 24. Qd3 Qb7 25. Rb1 Nb6 26. e5 Qe7 27. e6
fxe6 28. Qe4 *
Position (FEN): rr4k1/p3q1pp/1n2p3/6P1/4Q3/P6B/4P2P/KR5R b - - 1 28
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 419
Best move: Qxa3#