In the endgame, when the number of pieces on the board are fewer, it is important to use the King actively. Since the danger of mate is lesser, the King can also help the other pieces in fighting. In the below position, White has to play and win
1. Kxc3 Kb8 2. Kb4 Kb7 3. Kc5 Kc7 4. h3 good waiting move. White should not play 4. h4? Kd7 5. Kb6 c5 6. Kc5 Kc7 when Black will get the opposition and draw the game 4... Kd7 5. Kb6 c5 6. Kxc5 Kc7 7. h4 Kb7 8. Kd6 Kb8 9. Kc6 Ka7 10. Kc7 Ka8 11. Kb6 Kb8 12. Kxa6 1-0 Click here to view more examples: Link1, Link2 Two good game collections on Chessgames: Collection1, Collection2 Below is a complex but instructive video