In Fischer's hands, a slight theoretical advantage is as good a being a Queen ahead.
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[Event "Aeroflot Open"]
[Site "?"]
[Date "2007.??.??"]
[Round "?"]
[White "Sergey Grigoriants"]
[Black "Evgeny Shaposhnikov"]
[Result "1-0"]
[BlackElo "0"]
[FEN "8/2n5/6K1/7P/8/8/3k4/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Kf7 { Kf6 and Kf5 also work to keep black's knight away from white's
advancing pawn. } ( { The immediate pawn advance leads only to a draw. } 1. h6 Ne6 2. Kh5 Nf8 3. Kg5 Ne6+ 4. Kf6 Nf8 5. Kg7 Ne6+ 6. Kg8 Ng5 7. Kg7 Ne6+ 8. Kg6 Nf8+ { White can make no progress to promote his pawn. } ) 1... Nb5 2. h6 Nd6+ 3. Kg6 Kd3 4. h7 Ke4 5. h8=Q { White wins with a large material advantage. } 1-0