excerpt :

This settles all typical end-games of King and pawn against King. There is, however, one exception to the rules set out, namely, when a ROOK’S PAWN is concerned. Here the isolated King always succeeds in drawing if he can reach the corner where the pawn has to queen, for he cannot be driven out again. The Rook’s pawn affords another opportunity for the weaker side to draw. Diagram 55 will illustrate this, and similar positions are of frequent occurrence in practice.