Mark Dvoretsky The Instr7

Mark Dvoretsky The Instr7, A Collection of Chess Books

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The Instructor
Blockading Passed Pawns
The passed pawn is a dangerous criminal, which must be put behind bars:
lesser means, such as constant observation, are insufficient!
- Aron Nimzovich
The following examples, which I present for your observation, illustrate not
only some aspects of the blockade of enemy passed pawns, but other important
points of positional play as well.
Vukic - Davcheski
Yugoslav Championship 1979
1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 d5
The
Instructor
Mark Dvoretsky
For a long time, the Stonewall Variation of the Dutch Defense had the
reputation of being positionally suspect. It is true that Mikhail Botvinnik, in his
youth, included the variation in his opening repertoire; but he later rejected it
out of hand.
In the mid-nineties, Grandmaster Yusupov became interested in the Stonewall.
He saw that Black’s position had, besides the obvious positional minus of weak
dark squares, a serious plus as well. Black’s solid central construct prevents
White from continuing e2-e4; and without this continuation, his fianchettoed
Bishop at g2 will remain passive, and could very easily become just as “bad” as
its counterpart on c8.
I remember the day Artur came to me and said that he was going to play the
Stonewall. I was pretty skeptical, until we played a few blitz games with it. I
could see that White’s task was far from simple.
Where Botvinnik preferred to develop the Bishop at e7, Yusupov invariably
placed it on d6. Now at first, I was winning the blitz games, thanks to a plan I
remembered from the ancient game Schlechter - John (Barmen 1905). I played
Bf4, then e2-e3!, and tried to enforce the exchange of Bishops on f4 (by playing
c4-c5), recapturing with the e-pawn, with a very unpleasant pawn structure for
Black. But Artur quickly realized that he had to trade Bishops at once, as soon
as I played Bf4. The recapture g3xf4 weakens the kingside somewhat; which
will tell, if Black gets a chance to play g7-g5.
Yusupov played the Stonewall successfully on several occasions. Soon, it
became fashionable; its reputation improved, and its theory grew by leaps and
bounds.
The game we are examining here was played prior to the “renaissance” of this
opening system; many of its fine points had yet to be discovered. One of these
finesses has to do with move order. It turns out that White is better off
developing his Knight on h3, not on f3. So, these days, Black generally waits to
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     The Instructor
play d7-d5, temporizing with 4...c6!? Only after 5. Nf3 does he continue with
5...d5; if White plays 5. Nh3 instead, then 5...d6!?, preparing e6-e5, when the
Knight will be out of play on h3..
5. Nf3 Be7 6. 0-0 c6 7. b3 0-0
With the Bishop on d6, Black has the useful move 7...Qe7; and in order to play
Ba3, White will have to spend time on a2-a4 or Bb2 and Qc1.
8. Ba3 Bxa3 9. Nxa3 Qe7 10. Qc1 Bd7
One serious question, which always bedevils Black in the Stonewall, is, Where
does the white-squared Bishop go? In the old days, it always went via d7 and e8
to h5; nowadays, Black continues Nbd7, b7-b6 and Bb7.
11. Nc2 Be8
12. Nce1!
White’s Knight will stand beautifully on
d3 - from here, it takes control of the
important squares e5, f4 and c5. Tigran
Petrosian used to love just this placement
of his Knights. He would usually develop
the queen’s Knight to d2, then play
Nf3-e5-d3 and Nd2-f3. It used to be that
one had only to know this recipe in order
to get an excellent position against the
Stonewall.
12...Nbd7 13. Nd3 Bh5 14. Re1!
A “mysterious Rook move”, in Nimzovich’s words. What’s the point of it?
This is, first and foremost, prophylaxis
against the capture on f3. After 14...Bxf3
15. ef!, Black can no longer play 15...e5
It is interesting that the same position
was reached a few years earlier in Vukic
- Gazic (Sarajevo 1972). In that game,
White played 14. Qb2 (again directed
against 14...Bxf3 15. ef e5) 14...Ne4 15.
Rac1 g5 16. Nfe5 f4; and White
apparently achieved not much of
anything. Milan Vukic played more
consequently this time, intending to meet
14...Ne4 15. Nfe5 with a quick f2-f3 and e2-e4 - here is another reason to
play 14. Re1.
14...a5?
.
Don’t move pawns on the side where you are weaker!
Black weakens the
queenside, which assists White in opening lines there. As a result, he is
forced to forget about active play against the King, and White retains an
indisputable initiative.
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The Instructor
15. c5! Rfc8 16. a3 Be8 17. b4 ab 18. ab b5
White has so many good continuations,
his head is swimming. Taking en passant
on b6 looks tempting. Vukic’s suggestion
of 19. Qb2, followed by Nd2, f2-f3 and
e2-e4, is not bad either. Another move
worth looking into is 19. Qf4, threatening
to invade at d6 or c7, depending on
circumstances. Still another sensible idea
is 19. Nde5 Nxe5 20. de, in order to use
the d4 square for the Knight.
19. Ra5?
Played according to the principle of
Nimzovich: White exploits his advanced post on the open line - and, as
recommended with the rook file, he uses the Rook to exploit it. However, I
believe this to be a positional error. After exchanging on a5, White gains a
passed pawn; but since it must be defended by both Queen and Rook, their
active possibilities will be considerably reduced.
19...Rxa5 20. ba Ra8 21. Qa3
Before reading what follows, try to come
up with a move for Black yourself.
Just when it seemed that Black must be
doomed to passive defense, suddenly he
finds a pretty method to gain active play.
It’s so hard to resist temptation
sometimes...
21...Nb6?
Vukic awards this move two exclamation
marks, while giving his own 21. Qa3 a
question mark. Instead, he offers 21.
Qc3, evaluating that position as equal. Logically, this means that after 21.
Qa3 Nb6, White no longer has equality.
The dazzle of spectacular moves can sometimes have a powerful effect on
our perception of what is actually going on at the board. Now, let’s look at
the problem rationally. White will obviously reply 22. Nfe5 (although 22. a6
is also possible). Where then does the Black Knight go? If it gets exchanged
off on c4, the White’s Knight will go to b4, and the passed pawn on a6 it will
support will become very dangerous. Whereas the move 22...Na4 has only
one thing going for it - the temporary closing of the a-file. If White manages
to hold on to his passed pawn, then the Knight will have nothing to do on a4.
So we see that this pretty knight move involves considerable strategic risk. Of
course, the above considerations are insufficient for an objective evaluation -
the variations must be calculated as well. By first, let’s think about what else
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The Instructor
Black might have tried.
White obviously wants his Knight on b4; from there, it attacks c6, blockades
the b5-pawn, and helps the passed pawn at a5 take its first step forward. One
obvious choice is to put the Knight on a6, blockading the a-pawn and also
keeping White’s Knight from establishing itself on b4. In principle, Black
wants to trade off all the Knights, since the Bishop left on g2, biting on the
granite mass of Black’s central pawns, would pose no threat whatever.
Let’s see: 21...Nb8! 22. Nb4 Na6 23. Ne5 Nxb4 24. Qxb4 Qc7 25. Ra1 Nd7 26.
Nd3 (after 26. Nxd7 Bxd7 27. a6? fails to 27...Bc8) 26...Nb8! (but not 26...e5?
27. de Nxe5 28. Qf4), with equality.
If 23. Nxa6 Rxa6 24. Ne5, then 24...Nd7! (24...Qc7 25. Ra1 Nd7 26. Nd3! is
less accurate - although this position is defensible, too: there is the accurate
26...Nb8, as well as the more active 26...e5!? 27. Nb4 Ra7) On 25. Nd3 Black
again has 25...Nb6!, and this time, compared to the actual game, the
exclamation mark is fully deserved.
22. Nfe5 Na4
Vukic thinks 22...Nc4 23. Nxc4 dc (on 23...bc, both 24. Nb4 and 24. Ne5 are
strong) 24. Nb4 Qc7 25. a6 Nd5 was preferable. But the concluding position of
this variation strongly favors White! He continues with either 26. Ra1, or 26.
Bxd5!? ed 27. Ra1 Ra7 28. Qe3! (note that the endgame after 28. Qa5 Qxa5 29.
Rxa5 is also difficult for Black to defend)
23. Nb4 Qc7 24. a6
The moves leading to this position appear to
be more or less forced; that means their
evaluation, to a large extent, also determines
the evaluation of 21...Nb6. The question is
whether 24...Nxc5 works.
Black is fine after either 25. dc? Qxe5 or 25.
Nexc6? Nxa6. 25. Rc1 is tempting, but then
Black has 25...Nxa6! 26. Nxa6 Qb6
(26...Qc8 27. Ra1 b4) 27. Qe7 (on 27. Ra1,
Black can play either 27...Qxd4, with three
pawns for the piece, or 27...b4) Qxa6 28.
Qxe6+ Kh8 29. Rxc6! Qa1+ 30. Bf1 Qxd4.
But the refutation of Black’s idea is 25. Nbxc6!:
a) 25...Bxc6 26. Qxc5 Rxa6 27. Rc1 Nd7 28. Qe7;
b) 25...Nxa6 26. Ne7+! Kh8 27. Nxd5! ed 28. Qf8+ Ng8 29. Bxd5
.
24...Bd7 25. f4
White’s plan is clear: he will bring the Bishop to d1, followed by capturing on
a4 (thus, even the fianchettoed Bishop has found useful work!). Black can do
nothing to stop this.
Now we can finally say with confidence that 21...Nb6 deserves, not an
exclamation mark, but a question mark. Black’s active plan was a mistake,
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The Instructor
leading to a very difficult, and probably lost position. Passive defense was to be
preferred, involving the exchange of Knights and the blockade of the passed
pawn on a6.
The question arises, whether it’s right to call Black’s pretty idea 21...Nb6
anti-positional, if it can only be refuted by combinative means (24...Nxc5 25.
Nbxc6! Nxa6 26. Ne7+!, etc.)? After all, White might not find the refutation!
The fact that White has to resort to tactical means is quite natural. Let’s recall
the saying of Emanuel Lasker:
“With masters, combinative play and
positional play complement one another. It is with the aid of combinations
that they seek to overturn false evaluations; and it is by means of positional
play that they seek to secure and exploit true evaluations.”
The fact that there is but one solution, does not make it accidental. It is quite
fitting that the Knight on b4 plays the decisive role in the combination, since
Black could and should have exchanged it off, but failed to do so.
On the other hand, with the Knight gone to a4, Black’s position looks so
vulnerable, that I suspect there must be still another means of maintaining the
advantage. Let’s say White was afraid of the counterstroke 24...Nxc5; then he
could, in place of 24. a6!, try 24. Qe3!?, since the continuation 24...Qxa5 25.
Nexc6 Bxc6 26. Qxe6+ Kh8 27. Qxc6 Rd8 28. Nd3 (threatening 29. Qb7 and
30. c6) retains the better chances for White.
25...Kf8 26. Bf3 Ng8 27. e3 Ke8 28. Ra1
Black would answer 28. Bd1 with 28...Qa5; so White puts his Rook on the
a-file first. On 27...Ne7 (instead of 27...Ke8), 28. Ra1 would have been a
mistake, because of 28...Bc8; on the other hand, White could then play 28. Bd1
right away, since Black’s Queen would be tied to the defense of the Bishop at
d7.
“Chess - a Tragedy In One Tempo!”
28...Ne7 29. Bd1 Qa5 30. Bxa4 ba 31. Qxa4 Qxa4 32. Rxa4 Ra7
White has won a pawn. The conversion of
his advantage is not complicated, but it is
quite instructive. Making progress on the
queenside will not be easy - if the Knight
leaves the b4-square, the passed pawn will
come under immediate attack by Black’s
Bishop. So White must follow the
“principle of two weaknesses”.
He must
begin a second front on the kingside, open
lines there and send over his Rook. In the
light of this plan, White’s next few moves
are easily understandable.
33. h3! Kd8 34. g4 Kc7 35. Kf2 Be8 36. Ra1 Ra8 37. Ke2
Black may have intended to activate the Rook by continuing Ka7 and Rb8. By
bringing his King to c3, White parries this threat.
The basic principle of
converting one’s advantage is to stifle even the tiniest counterchances.
37...Nc8 38. Kd2 Na7
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