End Game mistakes
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20. Kf1? 20. Kd3! is better. The endgame has already begun, you want your king centralized.
49. Kc5?? 49. Ra3+ followed by 50. Rb3 looks like it wins.
54. Ra5+ this is pointless. You waste a move and black advances his king just where he wants to go.
55. Ra4+, also pointless.
You should have been trying to get your king in front of the pawns and your rook behind them.