Chess puzzle (Checkmate)
Opening: Queens_Gambit_Accepted, Queens_Gambit_Accepted_Central_Variation
Moves: 1. d4 d5 2. c4 dxc4 3. e4 Nc6 4. Bxc4 Nxd4 5. Nc3 e5 6. Nf3 Nxf3+ 7. Qxf3 Qf6
8. Nd5 Qxf3 9. gxf3 Bd6 10. Rg1 c6 11. Nc3 g6 12. Bg5 Ne7 13. O-O-O Bb4 14. a3
Bxc3 15. bxc3 b5 16. Ba2 c5 17. Bf6 Rg8 18. Rg5 Nc6 19. Rxe5+ Nxe5 *
Position (FEN): r1b1k1r1/p4p1p/5Bp1/1pp1n3/4P3/P1P2P2/B4P1P/2KR4 w q - 0 20
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1123
Best move: Rd8#