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Tigran V Petrosian vs Yuri L Averbakh
Moscow Training (1966), Moscow URS, rd 4, Jan-??
Queen's Gambit Declined: Vienna Variation (D30)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jun-07-07  patzerboy: Very interesting and tense middlegame duel on the queenside. I don't know if Black miscalculated or just lost patience, feeling the need to "do something," but it seems that 32...c5 was a mistake setting off a chain of events leading directly to resignation.

Not sure what he could have done instead. Sitting tight and waiting would have held on longer, but White will bring his Knight into play soon with c5 as its target. White would move his b2 Rook to b3 first to cover it with the Queen so that after Black takes the Knight on c5 with the Bishop (forced), White can take back with the b-pawn. This forces the Rooks off the board, leaving Black with a passed rook pawn but no way to advance it. White dominates the white squares with a good Bishop, the Queen infiltrates the queenside, and Black's pawns on a6 and c6 are both in danger. White has no comparable targets for Black to exploit. It would not be a quick win for White, but probably a sure one, especially for Petrosian.

I present this assessment welcoming any corrections or refutations.

Jun-07-07  Wolfgang01: I agree!! 32. c5 accelerates the loss of the game. Sometimes one must have lots of patience. I think 10. Re8 is to slow in this position. 10. Be6 looks better to me.
Feb-19-12  ozmikey: A fascinating positional struggle. It must have taken some foresight on Petrosian's part to determine that he would be able to make light of the badly-placed knight on a2.

Probably ...c5 should have been played one move earlier, although Averbakh might have been concerned about the knight re-entering the action at c3 in some lines. Even as played in the game, though, it's not lost until 35...Ne5? instead of 35...Bd6 (preparing to chop off the knight should it come to f4).

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