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Sarhan Guliev vs Vladimir Borisovich Tukmakov
Nikolaev Zonal (1993), Nikolaev UKR, Mar-??
Nimzo-Indian Defense: Classical Variation. Keres Defense (E32)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Aug-14-10
Premium Chessgames Member
  OhioChessFan: <ozmikey: Agreed! This one's actually pretty easy to calculate once you realise that White must play 35. a6! rather than 35. b6 (??) in the key line.>

<Willber: Can somebody please explain what is wrong with b6 rather than a6?>

I assume you mean this line:

33. a4 Kd6 34. a5 Kxd5 35. a6

If you look at this link under "Rule of the Square" you will get a pretty good idea of what is going on in this endgame. White is trying to keep the Black King out of the Square, and White is trying to push a Pawn so that Black's King can't get in the Square: http://en.wikipedia.org/wiki/King_a...

If 35. b6 then 35...axb6 36. axb6 Kc6 and the King easily stops the Pawn because it's inside the square (Some people call that "inside the cordon" or "inside the box").


click for larger view

If 35. b6 axb6 36. a6 Kc6 again puts the King inside the square.


click for larger view

In both cases, the extra Pawns on the Queenside are a pretty easy win for Black.

Aug-14-10
Premium Chessgames Member
  OhioChessFan: I'm not sure what lines those who propose 32. a4 have, but Nc4/b6 seems simple enough.
Aug-14-10  Marmot PFL: < After 32 Bxe5 de 33 a4 Kd5 34 a5 Kxd5 the position resembles one fron a week or so ago and the key move is 35 a6 (not 35 b6 Kc6). Black can also try 34...c4 but it makes no difference 35 a6 c3 36 Ke2 Kc7 37 d6+ etc.
Aug-14-10  RandomVisitor: Something like 31...Kd7 might preserve the 1/2 point...


click for larger view

Rybka 3: <23-ply>

[-0.26] 32.Ke3 Ne7 33.Ke4 Nc8 34.Be1 Nb6 35.Bc3 g6 36.Be1 Nc4 37.a4 Kc7 38.h4 Kb6 39.Bc3 Kb7 40.Be1 Kc7 41.g4

[-0.26] 32.Kf3 Ne7 33.Ke4 Nc8 34.Be1 Nb6 35.Bc3 g6 36.Be1 Nc4 37.a4 Kc7 38.h4 Kb6 39.Bc3 Kb7 40.Be1 Kc7 41.g4

Aug-14-10
Premium Chessgames Member
  kevin86: oops! fumble!!
Aug-14-10  ZUGZWANG67: Endgame, in which we have a B vs N configuration. B has a protected passed at c5 while W has a 2:1 Q-side majority. If he is to win W must address the N at e5 and dismantle the d6/c5 device. Then seperated pawns, 1 file apart can be stopped by the WK. And when he activates his Q-side, W creates a passed-a pawn. As a result he gets 2 seperated passed pawns, 2 files apart in the ennemy zone. And this wins.

32.Bxe5;

This is a classical advantage of a B vs a N in an endgame with pawns on both sides of the board. When most of his pawns are of colour opposite to his B, W often uses his long range piece to re-arrange the configuration of pawns to his advantage.

32...dxe5 33.Ke3!

I think this has to be done immediatly so that the BK does not have access to useful squares around his center pawns.

33...Kd6 34.Ke4.

Now B has the choice between keeping the status quo in the center or forcing things. In either case the answer will be 35.a4(!). For instance:

34...c4

Keeping the status quo would lead to the kind of losing seperated passed pawns (in B's point of view) I discussed in the introductory paragraph above

35.a4! c3 36.Kd3 Kxd5 37.Kxc3 Ke4 38.a5!!

Certainly not 38.Kd2? Kd4! when suddenly the BK heads for the back of the Q-side pawns.

38...Kf4.

Notice how useful the useless(!) W's K-side pawns are!

39.b6 e4 40.b7 e3 41.b8Q+.

Time to check.

---------

Aug-14-10
Premium Chessgames Member
  Nimzonick: after 35.b6 axb6 36.axb6 Kc6 black will stop the pawn from queening, and has all the winning chances. I completely failed to even consider 35.a6! and so I thought the K&P ending was lost, thus I thought 32.Bxe5 was a huge mistake. I think I learned from experience though.
Aug-14-10  ZUGZWANG67: Goshhh! Missed the continuation..
Aug-14-10
Premium Chessgames Member
  agb2002: White has a bishop for a knight.

Black threatens 32... Nc4 33.a4 Nb6 winning a pawn. This and the possibility of creating a distant passed pawn suggest 32.Bxe5 dxe5 33.a4:

A) 33... Kd6 34.a5

A.1) 34... Kxd5 35.a6

A.1.a) 35... Kd6 36.b6 Kc6 (36... axb6 37.a7 + -) 37.bxa7 + -.

A.1.b) 35... c4 26.b6 is similar to A.1.a.

A.2) 34... Kc7 35.a6

A.2.a) 35... Kb6 36.d6 c4 37.d7 Kc7 38.b6+ axb6 39.a7 + -.

A.2.b) 35... Kd6 36.b6 axb6 37.a7 + -.

A.2.c) 35... c4 36.Ke3 and the white king controls both passed pawns. When Black exhausts his pawn moves, White wins by playing d6 and b6 in the appropriate order.

A.3) 34... c4 35.Ke3 as in A.2.c.

A.4) 34... a6 35.bxa6 Kc7 36.d6+ Kb8 (36... Kc8 37.a7 Kb7 38.d7) 37.d7 Kc7 38.a7 + -.

B) 33... c4 34.a5 c3 35.Ke3 e4 36.a6 c2 37.Kd2 e3+ 38.Kxc2 e2 39.Kd2 + -.

C) 33... e4 34.a5 c4 35.b6 axb6 36.a6 c3 37.Ke3 as in B.

Aug-14-10
Premium Chessgames Member
  Eggman: Of course, this puzzle contains a similar theme to a puzzle from last week, namely from the game Shirov vs Akopian, 1992, with White to play after Black's 54...h2.

Thanks to that previous puzzle I solved today's puzzle immediately. So much of tactical skill is familiarity.

Aug-14-10  ZUGZWANG67: <<Willber G>: Can somebody please explain what is wrong with b6 rather than a6?>

And that will be with great pleasure.

Lets'consider both 32.Bxe5! dxe5 33.a4! Kd6 34.a5 Kxd5 and:

a) 35.a6! (1st d)
b) 35.b6?? (2nd d)

(after 35.a6)


click for larger view

(after 35.b6)


click for larger view

In the 2nd diagram 35...axb6 and either 36.a6 or 36.axb6 is refuted by 36...Kc6 followed by 37...Kc7. Note that the black pawns at c5 and e5 are "self defensible".

In the 1st diagram the situation is quite different: W has a blockade. That is: 35...Kd6;

Or else 36.b6 axb6 37.a7 and the BK is outside of the aquare of the a-pawn.

36.b6;

Anyway!

36...Kc6;

Because after 36...Kd7 37.bxa7 the BK is again too far.

37.bxa7! (d)


click for larger view

And there is no time for 37...Kb6: 38.a8Q.

Now I' m assuming that you know the stuff about "square of the pawn" and "self defensible pawns". I do not know where you are in your "improvement process" on the game. But if you don't know about this stuff and wish to, feel comfortable mentionning it. I will explain in a subsequent post.

Peace!

Aug-14-10  tivrfoa: I got Bxe5 followed by e4. Thanks <dzechiel> for showing e6! nice move
Aug-14-10  VincentL: "Very difficult".

Having looked at this position for a couple of minites, my instinct is to play 32. Bxe5 dxe5 33. a4

Now after 33..... Kd6 34. a5 Kxd5 35. b6. If black plays 35....axb6 36. a6! wins (we had a puzzle with a similar position recently). If 35.... Kc6 36. Ke3. Now 36....axb6 again loses to 37. a6. So black must play 36..... Kb7.

Now I don't see a way forward - I think black wins in this line.

So it must be 35. Ke3. But then black has 35....c4.

I have played on from here but white again loses.

I have come off the track somewhere - maybe even with the first move.

I have no more time, so must check.

Aug-14-10  scormus: <agb2002> OK 32 a4 is refuted by Nc4 to b6 and the WB cant cover it (33 Bh4+ Kd7)

And it was an easy one for a saturday too. Sigh

Aug-14-10  DarthStapler: I didn't get it
Aug-14-10  gofer: Do your remember your school days when a teacher was trying to drum an idea into your brain, and was being so methodical about it that they repeated the same example ad nauseum...

32 Bxe5 dxe5
33 a4 Kd6
34 a5 Kxd5
35 a6! Kd6
36 b6 winning

Now this is the third time CG have provided this example of pawn play and perhaps finally I am getting the point! Is there any alternative for black? Obviously not. If black goes to block the a and b pawns then the d pawn will come into play, so black has to take the d pawn...

32 Bxe5 dxe5
33 a4 Kd6
34 a5 Kc7
35 a6! ...

35 ... Kb6
36 d6 winning

35 ... any other move
36 d6+ Kxd6
37 b6 winning

Time to check...

Aug-14-10  obender71: The main line is:

32 Bxe5 de
33 a4 Kd6
34 a5 Kxd5
35 a6! Kd6
36 b6 Kc6
37 ba

the king cant access!

Taking the pawn

36 ... ab
37 a7

Pushing c4 instead of moving king at the 35th

35 ... c4
36 b6

Pushing c4 one move earlier

34 ... c4
35 b6

Earlier again is clever

33 ... c4
34 a5 c3
35 Ke2! Kd7
36 Kd3

Leave, instead of moving king, two passed black pawn is not working

35 ... e4
36 b6 ab
37 a6

Clever.

Aug-14-10
Premium Chessgames Member
  chessgames.com: <smitha1: Where is the "Like" button for <Once>'s post? If FB can have one, why can't CG do it? Or is this not that sort of site?> It's not that kind of site.

However, there is one way to upgrade users: premium members can put Once on their "favorites list" (see Premium Membership Help Page for more info). That conveys several advantages, such as highlighting his posts with a color of your choosing, and making his newest posts appear on the My Favorites Page.

Aug-14-10  LIFE Master AJ: I got this one.

But only because CG recently had another problem that featured this same trick. (a6! then b6! resulting in a Queen. As I remember, this was rather recently. There also the Black King could not approach, as the BK could not cross a key square... here it will be c6.)

Can anyone back me up here?

Aug-14-10  wals: Black's blunder:-
31...Ne5.+5.02.

Alternatives:-

Analysis by Rybka 3 1-cpu:

1. = (-0.25): 31...Kd7 32.Ke3 Ne7 33.Ke4 Nc8 34.Be1 Nb6 35.Bc3 g6 36.Be1 Kc7 37.g4 Kb7 38.h3 Nc4 39.a4 Kc7 40.h4

2. (0.33): 31...h6 32.a4 Nf8 33.a5

3. (0.35): 31...Nf8 32.a4 h6 33.a5 Nd7 34.Ke2 Nf6 35.b6 axb6 36.axb6 Kd7 37.b7 Kc7[] 38.Bxd6+ Kxb7[] 39.Bxc5 Nxd5 40.Bf8 Nf4+ 41.Kf3 Ne6 42.Bb4 Kc7 43.Ke4 Kd7 44.Kf5 g6+

4. (0.43): 31...h5 32.Ke3 Kd7 33.Ke4 Ne7 34.a4 g6 35.a5 Kc7 36.Bf2 Kb7 37.Bh4 Nf5 38.Bf6 a6 39.b6 c4 40.Bc3

5. (0.56): 31...Nh8 32.Ke3 Nf7 33.a4 Kd7 34.a5 Nh6 35.Bf4 Nf5+ 36.Kd3

White's death dive:-

33.Ke3. -3.21. The equivalent of 8 pawns. As indicated a4 was the move @ +5.02, and white cried enough.

Aug-14-10  mahmoudkubba: If the w. was winning ... why he resigned??? Unless he made the bad move of the k: like instead of 33, 33:a4. and still he could win even if moving the k in 33.
Aug-14-10
Premium Chessgames Member
  Willber G: To OhioChessFan and ZUGZWANG67:

Thank you for your thorough posts, most kind. It turns out that I had (for some reason) placed black's pawn at c4 which meant that, after a6, black's king could enter the 'square' via c5, hence my confusion! Ah well, more care next time.

Aug-14-10  midknightblue: hello lifemaster AJ, as usual you are right on the money good sir.
Aug-14-10
Premium Chessgames Member
  FSR: 32.Bxe5! dxe5 33.a4 Kd6 34.a5 Kxd5 35.a6!! . Deja vu all over again. Or 34...Kc7 35.a6! with the idea of 36.d6+! wins.
Aug-14-10  azax: This was extremely easy for a Saturday, I saw the winning line immediately. ^_^
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