White wins this ending by using his King aggressively. The King heads for c6, an ideal King and Pawn position, since it wins with or without the move.
- Kf6!
The only move to win. Moving 1. c5 instead allows 1. ... Kf7, 2. Kg5 Ke6 and Black will win the Pawn.
After the actual move, White has the opposition and by maintaining it makes the winning process child's play.
- ... Kf8
- Kf6 Ke8
- Ke6 Kd8
- Kd6
Black never gets a chance to approach the Pawn.
- ... Kc8
- Kc6
An endgame position worth remembering, since White wins no matter whose turn it is to move.
- ... Kb8
If instead 5. ... Kd8, 6. Kb7 (seizing control of the Pawn's queening square) Ke7, 7. c5, and the Pawn can not be stopped.
- Kd7 Kb7
- c5 Kb8
- c6 Ka7
- c7
White wins.