Here is another endgame study showing the importance of resourcefulness and accurate calculation in the endgame.
The path between drawing and losing can be very narrow sometimes.
The following endgame study is very much the sort of thing that can happen in practical play. Perhaps White has just won a Rook (say) by promoting on c8, forcing his opponent to sacrifice a Rook to remove the new White Queen.
And now Black is relying on his strong passed pawn to win the game.
But White can draw this seemingly hopeless position.
To find the only idea which draws, you need to be very resourceful and calculate accurately.