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Wolfgang Unzicker vs Mikhail Botvinnik
Varna Olympiad qual-1 (1962), Varna BUL, rd 4, Sep-19
Pirc Defense: Classical Variation. Quiet System (B08)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Apr-10-09  Rubenchik: 35 ... h4, losing game. Bb6-d8 seems draw
Jan-24-19  tigreton: The main mistake is 27 ab6, it allows Black to create a distant passed a-pawn, which later will distract White pieces from the defense of the kingside.
Jan-24-19
Premium Chessgames Member
  gezafan: Awful endgame play by Unzicker.
Jan-24-19
Premium Chessgames Member
  whiteshark: <gezafan> That's fair to say.
Mar-30-22
Premium Chessgames Member
  Fusilli: <tigreton: The main mistake is 27 ab6>

True that that move set white up for trouble. It looks like Unzicker played for the draw and underestimated the danger.

I am in awe of Botvinnik's 37th move. I was looking at an old issue of Chess Life where Soltis presents it as a puzzle.

The computer evaluates 37...gxh4 as only a bit better than Kf5 or g4, but it is surely the most elegant, and even the one that requires the least calculation.

Unzicker's best chance was 38.gxh4 though.

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