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 "Unknown198"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/2p1k3/P6p/3Pp3/1b4q1/5BP1/4KP2/R2R4 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]

1... Qc4+ 2. Rd3 ( { White can try: } 2. Ke3 Bc5+ 3. Kd2 Qd4+ 4. Kc2 Qxf2+ 5. Rd2 Qxf3 { Black wins with a large material advantage. } ) 2... Qc2+ ( { Black dare
not try: } 2... e4 3. Bxe4 Qxe4+ 4. Re3 Qxe3+ 5. fxe3 { White wins with a
large material advantage. } ) 3. Ke3 Bc5+ 4. Ke4 Qc4+ 5. Kxe5 Qxd3 { Black wins
with a large material advantage. } 0-1