Chess puzzle (Checkmate)
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Qxd5 4. Nc3 Qd8 5. e4 e6 6. Be3 Bb4 7. f3 O-O 8. Bd3
c6 9. Ne2 Nbd7 10. O-O Qb6 11. f4 e5 12. Rf3 Bxc3 13. bxc3 exd4 14. Nxd4 c5 15.
Nb3 Qc6 16. Na5 Qc7 17. Nc4 b5 18. Nb2 c4 19. Bc2 Bb7 20. Rh3 Bxe4 21. Bxe4
Nxe4 22. Qh5 Ndf6 23. Qxb5 Nxc3 24. Qxc4 Qxc4 25. Nxc4 Rfe8 26. Ne5 Nfd5 27.
Kf2 Nxe3 28. Rxe3 Nd5 29. Rf3 f6 30. Nc4 Re4 31. Rd1 Nxf4 32. Ne3 Rae8 33. Rd7
a5 34. Ra7 a4 35. Rd7 h5 36. Nf5 g6 37. Nd6 Re2+ 38. Kg3 Rxg2+ 39. Kxf4 *
Position (FEN): 4r1k1/3R4/3N1pp1/7p/p4K2/5R2/P5rP/8 b - - 0 39
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1606
Best move: Rg4#