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 "Unknown083"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r5k1/1p4p1/3p3p/p1p1p1rq/2P2n2/P2PQPP1/1P5P/3RN1RK b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]

1... Qxh2+ 2. Kxh2 Rh5# 0-1