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Lajos Portisch vs Dieter Keller
Moscow Olympiad Final-A (1956), Moscow URS, rd 9, Sep-21
Queen's Gambit Declined: Exchange. Positional Variation (D35)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Mar-17-04  rochade18: This is what I call attacking play by by white.
Apr-28-04  Dudley: if 30...Qc7 31. b6! Qb8 32. Qa4! and white wins. Very cute- the pawn move sets up the fork of the knight and rook. A passed pawn is not always an end in itself- it creates other opportunities.
Jun-07-04
Premium Chessgames Member
  Honza Cervenka: After 30...Qc2 (30...Qc7 31.b6 Qb8 32.Qa4 ) 31.Rf1 Qc7 32.b6 Qb8 33.Rd1 black has no satisfactory defence against 34.Qa4 winning the Knight. Of course, 33...Qxa7 34.bxa7 is hopeless for black.
Aug-16-04  patzer2: With 29. a3!, White initiates a winning passed pawn combination.

After 29. a3! the key variations are

(1) 29...bxa6 30. Qd7! (not 30. b6? Qxc3 31. Qd7 Rb8 32. Qxd5 Qc2 33. Re1 a5 ) 30...Rf8 31. bxa6 Qxc3 32. Qxd5 [Play might continue 32...h6 33. a7 Qc2 34. Rf1 Qa2 35. h3! Qa4 36. Qb7 Nd2 37. Rc1 Qa3 38. Rd1 Kg7 39. d5 etc. ]

(2) 29...Qxc3 30. axb7 (or 30. Qxb7 ) as in the game. [Play could continue 29...Qxc3 30. axb7 Qc2 31. Rf1 Qc7 32. b6 Qb8 33. Qa2 .]

(3) 29...b6 30. Qd7 (or 30. Qxb6 ). [Play could continue 29...b6 30. Qd7 Rf8 31. Qxd5 Qxc3 32. Qxg5+ Kh8 33. Qe5+ f6 34. Qd6 Qc8 35. Qxb6 .]

(4) 29...Na5 30. axb7

(5) 29...Kg7 30. axb7

Apr-30-20
Premium Chessgames Member
  Marcelo Bruno: Hi, friends! Why didn't Keller take the b5 Pawn in his 17th move?
May-01-20  Muttley101: <Marcelo Bruno: Hi, friends! Why didn't Keller take the b5 Pawn in his 17th move?>

I suspect that if black played 17 ... c:b5, 18. Qb3 regains a pawn. Black is either left facing central pawns, or a weak d-pawn and open lines against the a- and b-pawns.

Black's 17 ... c5 was instead an attempt at counterplay, which involved ditching the a-pawn, of course. I don't know which is better, frankly, as black looks worse anyway, but it needs a more detailed and concrete analysis to answer your question comprehensively.

It is worth looking at earlier improvements- black can play ... a6 to hold up the b-pawn and exchange pawns, lessening the impact of the minority attack, and also play less stereotypically with 11 ... Na6 idea ... Nc7 and possibly Nb5-d6 later (see - Portisch vs Kasparov, 1989 and there are other examples of more successful QGD exchange for black linked in that game).

Hope that helped.

May-06-20
Premium Chessgames Member
  Marcelo Bruno: <Muttley101>: I believe your opinion is right, because, if after 18.Qc3 Black wants to protect the b5 Pawn with …a6, 19.Qxd5 is good for White, that gets two dangerous central Pawns, and that may be decisive during the endgame.

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