Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 dxc4 3. Nc3 Nf6 4. e4 e5 5. d5 c6 6. Bxc4 cxd5 7. exd5 a6 8. Bg5
Be7 9. Nf3 Bg4 10. h3 Bxf3 11. Qxf3 e4 12. Nxe4 b5 13. Nxf6+ Bxf6 14. Bxf6 gxf6
15. Qe4+ Qe7 16. Qxe7+ Kxe7 17. Bb3 Nd7 18. O-O Kd6 19. Rac1 Rac8 20. Rc2 Ne5
21. Rfc1 Rxc2 22. Rxc2 Rg8 23. Kf1 Re8 24. f4 Nd3 25. Rc6+ Kd7 26. Rxa6 *
Position (FEN): 4r3/3k1p1p/R4p2/1p1P4/5P2/1B1n3P/PP4P1/5K2 b - - 0 26
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 684
Best move: Re1#