Here is a variation from a correspondence game between Hollis-Florian, 1974.

1... h4 Black tries to run the h-pawn and set up a drawn position. If black gets pawns on f5, g4 and h3 and king on g5, he will draw. 2. Kc2 g5 2... Kg5 3. Rxf7 Kg4 4. Kd2 h3 5. Ke2 Kg3 6. Kf1! 3. Kd3 Kg6 4. Rb6+ 4. Ke3 f5 5. Rb8 Kg7 and black will get the drawn position mentioned above. 4... Kf5 5. Ke3 Kg4 5... g4 6. Rb5+ 5... h3 6. Kf3 g4+ 7. Kg3 Kg5 8. Rb8 f5 9. Rf8 6. Kf2! 6. Rf6? Kg3 and black will block the white king out and score a queen! 6... f5 7. Kg2 Kh5 8. Rf6 Kg4 9. Rf8 Kf4 10. Kh3 White has successfully fronted the pawns and stops them cold. 10... Ke4 11. Rg8 Kf4 12. Rg7 Zugzwang! 1-0