The square of the pawn
White to move and draw.
Can your king catch a runaway pawn? Draw a square from the pawn to its promotion rank: if your king can step inside, it can.
The idea
- Count the pawn's distance to promotion and imagine a square of that size.
- Head straight for the corner in front of the pawn.
- Once there, stay there: a rook pawn cannot force you out.