Race of the passed pawn
The most important factor in such a race is, which passed pawn is most dangerous:
The Fischer endgame
The endgame rook and bishop against rook and knight, where the side with the bishop
holds the advantage, is also called Fischer endgame, as the famous American World
Champion won so many instructive games with this material balance:
The spare tempo
In pawn endings every tempo counts:
Nakamura's King
It is often difficult to evaluate, if many passed pawns can be stopped or not:

Karsten Müller in ChessBase Magazine
Do you like these lessons? There are plenty more by internationally renowned
endgame expert Dr Karsten Müller in ChessBase Magazine, where you will
also find openings articles and surveys, tactics, and of course annotations
by the world's top grandmasters.
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Apart from his regular columns and video lectures in ChessBase Magazine there
is a whole series of training DVDs by Karsten Müller, which are bestsellers
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