In the endgame, the king stops hiding and becomes active. Just remember: active does not mean invincible.

The square rule tells you if a king can catch a pawn. One quick mental picture saves a lot of counting.

Opposition forces the other king to give way. Two kings stare each other down, and the one to move often loses patience.

A passed pawn has no enemy pawn in front of it. Its message is simple: let me advance and I may become a queen.

King and pawn versus king looks tiny, but one tempo changes everything. Win or draw can be one square apart.