Outside the Box:
An endgame fundamental rule that help you to get better in pawn endings. It called 'The Square Rule' which goes like this: 'Every pawn has its square when it going to be promoted. If a King is inside this area he will catch this pawn. If a King is outside this area he will not catch this pawn. Below is an example of this works. Calculate the difference between the King's & Pawns for both - black and white and determine which king is going to be in time to stop the enemy pawn from promoting.