After move 50 is this winnable for white?

Is it a straight forward win or complicated? It looks to me like I would have to fight to keep one pawn and force a win. It seems like I should be able to do it. Any insights?

Sorry. I meant to say is this winnable for black.

It is see lichess.org/VFUOmP8M#99. In the computer analysis, in the tablebases.

it´s a straighforward win. It will not be possible for white to gobble up one of the pawns. Black will just push his a-pawn through. You can use Shredder tablebase to analyse for yourself:
www.shredderchess.com/online-chess/online-databases/endgame-database.html

Yes, it is winable. White rook should stay on g6, but it doesnt

This is a win for black after black's 50th move unless black plays poorly. Black's 2 pawns and position don't give white viable options to defend.

Could someone please give me the basic info on how to win this as black. I went on shredderchess.com but am not knowledgeable enough to figure it out (the web site software). What is the basic idea to force a win and how?

you simply force the a-pawn all the way through with the help of your king. Basically how you did in the game except 57...Kb6??. 57...Kb4 is straight forward and strong

Thanks, FtC. I see how it would be done now.

In general, in rook endings, being a pawn up is often, but not always, winning. 2 pawns up is almost always winning except in a few strange cases.