The hardest game to win is a won game.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "8/p7/8/8/7P/k7/1pK5/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Pawn Mate.|This king and pawn endgame lesson demonstrates the lethal
power of a pawn-mate. } 1. Kb1 { White must step in front of the b-pawn to stop
black from forcing its promotion by 1... Ka2 and 2... b1=Q. } 1... Kb3 { Black seals
the white king's fate. } 2. h5 { In this position, we see that white has
effectively frustrated black's attempt to promote his knight-pawn. White may
take some initial satisfaction in the effectiveness of his blockade, and the
fact that his own pawn is unstoppable. } 2... a5 3. h6 a4 4. h7 a3 5. h8=Q { Ahh!
The glory of a new minted queen. } 5... a2# { Yes, a pawn can deliver checkmate.
A sad ending for white who thought he had a winning material advantage. } *