Viktor Korchnoi

No Chess Grandmaster is normal; they only differ in the extent of their madness.

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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown027"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "5rk1/1p4pp/4R3/rp6/8/7P/1PP3P1/1K4R1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]

1... Rfa8 2. b3 Ra1+ 3. Kb2 Rxg1 { Black wins with a large material
advantage. } 0-1