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Lajos Portisch vs Leonid Stein
Sousse Interzonal (1967), Sousse TUN, rd 19, Nov-09
King's Indian Defense: Fianchetto Variation. Classical Main Line (E69)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Feb-21-07
Premium Chessgames Member
  Honza Cervenka: What a game! Despite of some inaccuracies magnificent fight. Instead of 18.Rad1 white should play 18.Red1. Leaving of a-file allowed black to get pretty good counter-play. After simple 25...Bxd4 26.Rxd4 Rxb4 white's material advantage would have played no big role and the game would be drawn easily by black. After 25...Bf8 Portisch surprised his opponent with bold sac of exchange. 34.c5 was a zeitnot slip (34.Rc2 would have been more precise) which Stein failed to exploit (36...Bc4 with next Ba6) being in time pressure too.
Feb-21-07  euripides: <Honza> thanks - this is really stupendous.
Mar-27-21  nummerzwei: In his analysis, Portisch gave the weaker alternative 49.Ke3 Ke5 50.Bb5? (White still wins after the paradoxical 50.g4! indicated by Speelman) ...f5 51.Ld3 g5 52.Kf3


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Here, the Hungarian shows that White cannot win after 52...f4!? 53.g4 h5!. The lines are rather complicated, though - 52...h5! with the idea of 53...g4+, 54...fxg4+ and finally 55...h4! is a lot more straightforward. After 53.Ke3, Black plays 53...f4+, of course. White is always left with just a wrong rook's pawn.

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