Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. Nc3 e6 3. e4 Bb4 4. e5 Bxc3+ 5. bxc3 Nc6 6. f4 Bd7 7. Nf3 h6 8. Bd3
Nge7 9. O-O Nf5 10. Ba3 Nh4 11. Rb1 Nxf3+ 12. Rxf3 Qh4 13. Rxb7 Ne7 14. Rxc7
Nf5 15. Qb1 Qd8 16. Qb7 Rb8 17. Qxa7 Rb1+ 18. Kf2 Qh4+ 19. Rg3 Qxf4+ 20. Rf3
Qd2+ 21. Be2 *
Position (FEN): 4k2r/Q1Rb1pp1/4p2p/3pPn2/3P4/B1P2R2/P1PqBKPP/1r6 b k - 3 21
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1528
Best move: Qe1#