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Viktor Korchnoi vs Tigran V Petrosian
Korchnoi - Petrosian Candidates Quarterfinal (1977), Il Ciocco ITA, rd 3, Mar-05
Catalan Opening: Open Defense. Classical Line (E05)  ·  1/2-1/2

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Kibitzer's Corner
Dec-11-05  hayton3: In Edmar Mednis's fantastic book "Strategic Chess" he describes 5...dxc4 as a mistake. In the Open Catalan, characterised by Black taking on c4, he should make this capture either on move 4 or move 6 after he has castled. Taking on move 4 involves a rapid mobilisation of Black's queenside, while taking on move 6 was popularised by Karpov who demonstrated that after castling Black could take on c4 and then develop his pieces dynamically while White went about recapturing the pawn. Here Petrosian mixes up the both plans, loses an important tempo, goes down a pawn and thanks to some imprecise play by Korchnoi escapes with a draw.
Apr-11-15  Howard: 33...Rc3 ! was what helped equalize the position---sharp tactical play by Petrosian.
Feb-05-20  Howard: CL&R indicated that Korchnoi probably should have won this game. Stockfish seems to have confirmed that.
Feb-05-20  Petrosianic: <In Edmar Mednis's fantastic book "Strategic Chess" he describes 5...dxc4 as a mistake. In the Open Catalan, characterised by Black taking on c4, he should make this capture either on move 4 or move 6 after he has castled.>

He made the same comment when annotating the game for Chess Life & Review, but doesn't quite explain <why> it's wrong on Move 5. Surely, if 5...O-O 6. Nc3 dxc4, we have the exact same position by transposition. You say Black loses a tempo, but exactly where does he lose it? Mednis never shows the other line he's thinking of, so we can see the difference.

Feb-05-20
Premium Chessgames Member
  OhioChessFan: I knew without checking SF that 29. Rb8 was a mistake. I'm hard pressed to think of any good reason to play that
Feb-05-20  Petrosianic: The reason for Rb8 is to prepare to double rooks on the 8th, while preventing Black from kicking the Knight with b5.

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