Straight from the source because I cannot link the game. GM Nunn’s book Understanding Chess Endgames again, I do suggest you purchase a copy if endgames are what you want to study, and you are a rather meek club player like myself. Have a look at the following position, it’s white to play.
White is able to win this but there is only one way to do it, via the intermediary check Rg6! As the analysis shows below, black is compelled to capture on f4 but a pawn race will soon ensue, which allows white to pick up a valuable tempo by queening his pawn with check. To me it doesn’t look like white can save himself. In endgames, where lines of calculation ealongate, I wouldn’t see the significance of the intermiediary check. Would you?
Analysis can be found here:
M J M
McCreadyandChess 