In Fischer's hands, a slight theoretical advantage is as good a being a Queen ahead.
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[Event "rated untimed match"]
[Site "Kecskemet"]
[Date "1927.??.??"]
[Round "?"]
[White "Yates"]
[Black "Alehin"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/p7/1pQ2nk1/5p2/5Pp1/P1P3K1/3r3p/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Kh5 2. Qxf6 ( { White can try: } 2. Qb7 Ne4+ 3. Qxe4 fxe4 4. f5 Kg5 5. f6 h1=N# ) 2... h1=N# 0-1