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 "Unknown286"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r2k/3Q2p1/Pp5p/8/3pn3/B3q2P/2r3P1/R5RK w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]

1. Qxe8+ Kh7 2. Qb8 { White wins with a large material advantage. } ( { White can
try: } 2. Qf7 Ng3+ 3. Kh2 Qe5 4. Bf8 Nf1+ 5. Kh1 Qh2# ) ( { White can also try: } 2. Rae1 Nf2+ 3. Kh2 Qf4+ 4. g3 Ng4+ 5. Kh1 Rh2# ) ( 2. Rge1 Ng3+ 3. Kh2 Nf1+ 4. Kh1 Ng3+ 5. Kh2 Nf1+ 6. Kh1 Ng3+ { Draw by repetition of position. } ) 1-0