Checking from a distance is a key defensive technique in rook endings. For the checks not to run out, the rook has to sit far enough from the enemy king (at least three files away): then the king cannot come near and block with an attack on it.
Here White has the king on e8, a pawn on e7 and the rook on f1; Black has the king on g7 and the rook on a2. Black to move, and it is a draw (per the tablebases): the rook on a2 is at the right distance and checks the white king indefinitely.
The «checking distance» rule (at least three squares between rook and king) is what you need to know to save rook endings a pawn down.
Drag a piece onto the board, or click a piece and then click the squares. The cross beside the pieces sweeps every piece of that colour off the board, and a single piece can be dragged off the edge.
The pieces will be arranged into the chosen pattern.
It is the mating side to move. Find mate in one.
Openings, endgame positions and breakthrough studies - the set-up appears on the board.
So the enemy king cannot attack the rook. From three squares or more he cannot get across in time, and the checks can go on indefinitely.
At least three files or ranks between it and the enemy king - that is the long side.
Switch to attacking the pawn from behind, or look for a trade leading to a drawn pawn ending.
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