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 "?"] [Date "1972.??.??"] [Round "?"] [White "Gligoric"] [Black "Commons"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "3r4/2rn2pp/k1p1pp2/p1P5/1pK1P3/1P3P2/PBR3PP/3R4 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] { White has just moved Rd1 in what seems like a reasonable attempt to free his position and compete for the open file. Furthermore, if black plays Ne5+, then white wins a piece.|But black see deeper. } 1... Ne5+ 2. Bxe5 Rxd1 3. Bxc7 { White goes up a piece and expects to win the game. } 3... e5 { Black slams the door shut on white's king. It is black who has the last laugh. } 4. Rd2 Rxd2 5. Bxe5 fxe5 6. a3 Rd4# 0-1