Penguincw: Congrats to Awonder Liang for winning his first game of the tournament!
Too many pawns for black to handle. It's like fighting against a million Kindergartens.
Not much time for either player on the clock, and well, there were some slipups.
First one was 51.Kg2 instead of 51.Kg3. This buys black time to play 51...Kd7. White needs to get their pawn up to the 5th rank. The white king being on g2 instead of g3 costs white a tempo. Ex. 52.f4 Re8 53.Kf3 Rc8 54.Ke4 Re8+ 55.Kf5 Rf8+ 56.Kg4 Rg8+ 57.Kf3, back to the hidey hole for white. They can't advance their king or (pawns) up.
And if something like c4, then Rb8 with the threat of taking on b4 and then racing that pawn down.
White made it a lot more difficult to win after moving to g2, but black returned the favour by playing 52...Ke6.
Eventually what white wants to do is grab the a4 pawn and disregard the f-pawns, but white uses the f-pawns as threats anyhow. More than one way to win, and glad white was able to one.