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Lajos Portisch vs Tigran Vartanovich Petrosian
San Antonio (1972), San Antonio, TX USA, rd 4, Nov-23
English Opening: Symmetrical. Two Knights Variation (A35)  ·  1/2-1/2
ANALYSIS [x]

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Kibitzer's Corner
Feb-22-04  suenteus po 147: It seems to me that 21...Rae8 represents a deep plan on Petrosian's part to create an impenetrable blockade that Portisch cannot break through without unacceptable sacrifices. 22.Nb1 on Portisch's part is arbitrary to how things turn out since 22...Nd7 is part of Petrosian's plan, allowing both 24...e5 (solidifying the blockade of pawns) and the white bishop to invade and take the rook (which is no longer needed). It's a worthy sacrifice since Portisch is never able to make anything of his advantage.
Aug-17-05  ARTIN: material advantage you mean. Because before move 31 Black has a good positional advantage. I think he should have prevented the exchange of c6 night with the c8 bishop.
Nov-06-05  aw1988: With 24. Bg5, Portisch tries to induce the positional blunder ...f6, but instead iron Petrosian comes up with 24...e5!. Portisch apparently spent 10 minutes on his next move, not on the board, but looking straight at his opponent. His Be7 is a positional mistake.
Nov-12-05
Premium Chessgames Member
  keypusher: <aw1988>

Petrosian on the position after 24...e5: "[Portisch] cannot decide whether I have sacrificed the exchange or blundered it away. Finally, after the game, Portisch said he had decided it was a blunder...." Quoted in Watson's Secrets of Modern Chess Strategy, p. 204.

Of course, it was a sacrifice.

Jan-04-06
Premium Chessgames Member
  Gypsy: Marin considers <32...Rf8> an inacuracy and recommends to insert 32...Kh8, so that Ne7 would not deliver a check.
Jun-15-12
Premium Chessgames Member
  wordfunph: from GM Suba's book Positional Chess Sacrifices..

"Portisch thought for about ten minutes, staring at me fixedly, while I kept a poker-face. He could not decide whether it was a blunder or a sacrifice."

- Tigran Petrosian (on 24...e5)

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