Long Grind

HAD to grind out a 52-move ending this morning in round four of the 22nd 4NCL U2000 at Telford.

Black to make his 51st move in Spanton (1900/171) - Kyle Pelling (1463/127)

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White is obviously better thanks to his vastly superior pawn-structure, but my main analysis engines Komodo9 and Stockfish10 reckon White's advantage is worth less than two-fifths of a pawn.
50...Kd5?
But now Black is lost. The engines reckon Black should play 50...a5 or 50...f5, when White continues to grind.
51.Rd4+
This wins the d file and forces the black king to give up protecting the c pawn.
51...Ke6 52.Kc4 f5 53.Kc5 Rg8 54.Rd3 Rb8 55.Rd6+ Ke7 56.Rxc6 Rg8 57.Rxa6 Rxg3 58.Rh6 (1-0, 77 moves)