Welcome to week 23 of Summer Chess School. if you're just coming on and would like to learn endgames, just reach back into our archive. It's all there! White can't afford to let Black queen one of the pawns, so he has to check or threaten to checkmate to keep the Black king busy. The little chase scene that arises is almost comic.
A study by Moravec in 1924. 1.Ra1+ Kb8 2.Rb1+ Kc8 3.Ra1 Kd8 4.Kd6 Ke8 5.Ke6 Kf8 6.Kf6 Kg8 7.Ra8+ White can't keep moving over because after 7.Kg6 g1Q+ and Black wins. 7...Kh7 8.Ra7+ Kh6 9.Ra8 Kh5 10.Kf5 Kh4 11.Kf4 Kh5 12.Kf5 and a draw. ½–½