In Fischer's hands, a slight theoretical advantage is as good a being a Queen ahead.
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[Event "World Cup Tournament"]
[Site "Tromso, Norway"]
[Date "2012.??.??"]
[Round "?"]
[White "Yuriy Kryvoruchko"]
[Black "Vassily Ivanchuck"]
[Result "0-1"]
[BlackElo "0"]
[FEN "8/4kp2/2Qp1p2/5P2/4P3/Pp1q4/1P1r4/KR6 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rd1 2. Rc1 Qc2 { The power of the pin. } 3. Qxc2 bxc2 4. Ka2 Rxc1 { Black
wins with a large material advantage. } 0-1