Does anyone know the source of this position?

[MOBMAT]

[d]8/8/4p1pp/2n5/r6P/R1p3K1/3k1R2/8 b - - 0 1

I picked up this position somewhere and had it marked as a possible draw.
After letting SF DEV chew on it, it found a win (Syzygy score) at ply 50 in 28m and found a mate in 32 at ply 69 in 1h25m. There might be a faster mate but I stopped the search.
I7-6700K @ 4.00Ghz, 3 cores, 8Gb hash, 5-man Syzygy.
The published move of Kd1 is correct.

[AdminX]

[d]8/8/4p1pp/2n5/r6P/R1p3K1/3k1R2/8 b - - 3 56
Black to Move 56. ... Kd1

[pgn] [Event "Moscow2"] [Site "Moscow"] [Date "1967.??.??"] [Round "?"] [White "Lukin, Andrei M"] [Black "Karpov, Anatoly"] [Result "0-1"] [ECO "E31"] [PlyCount "116"] [EventDate "1967.??.??"] [EventType "tourn"] [EventRounds "13"] [EventCountry "URS"] [SourceTitle "EXT 2007"] [Source "ChessBase"] [SourceDate "2006.11.23"] [SourceVersion "1"] [SourceVersionDate "2006.11.23"] [SourceQuality "1"] 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 d6 7. f3 O-O 8. e4 Re8 9. Bd3 Bxc3+ 10. bxc3 Nbd7 11. dxe6 fxe6 12. f4 Qc7 13. Nf3 b5 14. Bxf6 Nxf6 15. e5 dxe5 16. fxe5 Nd7 17. O-O Bb7 18. Bc2 bxc4 19. Qe2 Bd5 20. Rae1 Qa5 21. Ng5 Qxc3 22. Bh7+ Kh8 23. Bb1 Re7 24. Qh5 Qd4+ 25. Kh1 Bxg2+ 26. Kxg2 Qd2+ 27. Kh1 Qxg5 28. Qf3 Rb8 29. Qe4 g6 30. Rg1 Qf5 31. Qe3 Rxb1 32. Rxb1 Kg7 33. Rbe1 Rf7 34. Qe2 Qd3 35. Rg3 Qd5+ 36. Qg2 Qxg2+ 37. Kxg2 Rf5 38. Ra3 Nxe5 39. Rxa7+ Kf6 40. Rf1 Nd3 41. Ra4 Nb2 42. Ra5 Nd3 43. Ra4 Ke5 44. Rxc4 Kd5 45. Rc2 Rg5+ 46. Kf3 Kd4 47. h4 Re5 48. Rd1 c4 49. a4 Rf5+ 50. Kg3 Ra5 51. Ra2 c3 52. Rf1 Nc5 53. Rf4+ Kd3 54. Ra3 Rxa4 55. Rf3+ Kd2 56. Rf2+ Kd1 57. Rf1+ Kc2 58. Rc1+ Kb2 0-1 [/pgn]