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Erik Ruben Lundin vs Julio Bolbochan
Amsterdam ol (Men) fin-A (1954), Amsterdam NED, rd 6, Sep-18
King's Indian Defense: Fianchetto. Yugoslav Variation Exchange Line (E66)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Aug-20-10
Premium Chessgames Member
  patzer2: For today's Friday puzzle solution, Black initiates a deep trapped piece combination with 28...f5!

If 29. Nd2?, then 29...Nb3 piles on the hapless pinned Knight to win decisive material.

Aug-20-10  et 9: Thanks David2009. But isn't black's "weak" line still winning after say 33.....Nd3. The a-pawn rules, right?! [[28...f5! is definitely the move. My line is weak, since after 32 c5 bxc5 33 Nxc5! gives White good play a pawn down.]]
Aug-20-10  EXIDE: Finally got one right this week. I was afraid I was going to strike out this week. Todays puzzle seems easier than earlier puzzles for this week. Not too many options for black other than f5.
Aug-20-10  Patriot: I spent probably 2-3 minutes on this and thought 28...Nb3 was correct. I calculated the same line as <dzechiel> but didn't compare it with 28...f5 which is superior thanks to analysis by <Once>. His 31.f4 idea makes a lot of sense. It eliminates the mate threat while allowing the situation with both knights remain. This is a great idea to remember. Whenever pieces of equal value are hanging on both sides, there's a good chance that situation can be ignored. Of course every position still has to be analyzed on its own merit, but it's another arrow to put in your quiver.
Aug-20-10  chessgolfer: I too conentrated on Nb3 but the analysis by <Once> is (to me) very instructive. f5 clamps down the Knight at e4 and gives the black King breathing room thus allowing Nb3 without complication. For me, not bad for a Friday.

BTW <Once>, after your vivid description of the bride's family I would pass on the groom's.:=)

Aug-20-10  howlwolf: I saw f5 in an instant. White's back rank cried to be exploited. The solution to yesterday's puzzle was much more difficult to spot.
Aug-20-10  desiobu: I didn't calculate all the variations (including the game line) but I got the right plan starting with 28...f5.
Aug-20-10  twin phoenix: Hello Chess games!! been away for 8-9 months but always come back for more. Wish Dzechials comment was still posted cause he always helps me...

Playing 28.--,Nb3?! is a little premature. This is one of my largest problems (I see the combination but don't go through all the preliminary moves to make sure it's crushing.) I saw this and came up with the correct solution 28.--,f5! but alas didn't see the game continuation and missed the 31.--,Rd3 move that finishs the combo. Thus, i don't get credit. got a little help by knowing the difficulty which indicates 28.--Nb3 is a little too easy... Just wish that i could get a meter that tells me how hard my move is to come up with OTB!!

Aug-20-10
Premium Chessgames Member
  kevin86: Poor knight-all dressed up with noplace to go. A bizarro LeBron James.

A knight IS a cavalier.

Aug-20-10  Whitehat1963: Why do I even glance at Friday puzzles with any feeling of hope?
Aug-20-10
Premium Chessgames Member
  benveniste: I found 28. ... cxb4. Then after the forced 29. axb4 recapture, both 29. ... ♘b3 and 29. ... f5 looked equally good to me.
Aug-20-10  VincentL: "Difficult".

The first line I see is 28....Nb3 29. Rxd7 Rxd7.

Now, if 30. Rb1 f5 31. Rxb3 fxe4 32. Bxe4 and white is winning (I think).

So it must be f5 first.

28....f5 29. Nc3 Nb3 30. Rxd7 Rxd7

Now white has to play the ugly move 31. Rc2 to avoid losing the knight (31. Rb1 Nd2+).

But now what? I am missing something.

I am out of time, and must check.

Aug-20-10  YouRang: I went with 28...Nb3, which turns out to be pretty good too, I think, but it's not quite as simple as I thought it would be.
Aug-20-10  YouRang: <VincentL: "Difficult".

The first line I see is 28....Nb3 29. Rxd7 Rxd7.

Now, if 30. Rb1 f5 31. Rxb3 fxe4 32. Bxe4 and white is winning (I think). >

No, you overlooked the back-rank mate 31.Rxb3? Rd1#

The white rook is anchored to the 1st rank.

Aug-20-10  ZUGZWANG67: Material is even and symetrical. Black has tactical devices in stock:

-Uncomfortable WN at e4;

-The inadequately defended R at d1;

-Thus, discovery <and> double attack when the BN reaches b3;

-In the event of Nc3 (after, say, ...f5) B also gets an other double attack (being given the liberation of the Bg7) when his N goes to b3;

-Back rank mate threat;

-A potentially useful d2-square, which might be used for check if his N is at b3.

As always, B's task is to coordinate these elements so that they fit into each other. I have 28...f5, when W has 3 different replies:

<29.Nd2, 29.Nc3 and 29.e3>

<a)> 29.Nd2 Nb3! 30.Rb1 Rxd2 31.Rxd2 Rxd2 and W must play e3 before he takes the N; 30.Rc2 is no better: the WN's attack/defense ratio is 3:2.

<b)> 29.Nc3 Nb3 attacks everything in the material world.

30.Rxd7 Rxd7 31.Na2 (31.Rb1?? Nd2+!) 31...Nxc1 32.Nxc1 (32...cxb4 33.axb4 a5! and 34...Ra7) is worth the exchange.

<c)> 29.e3;

The critical move.

29...Nb3 30.Rxd7 Rxd7 31.Rb1 Rd3!;

All of sudden the WN has no good retreat.

32.Nd6!?;

Hoping (naively?) for 32...Rxd6 33.Rxb3.

32...Nd2+!

And d2 proves to make the difference. Lovely.

Time to check.

-------

Peace!

Aug-20-10  ZUGZWANG67: <Once: <dzechiel> <paavoh> In your line, after 30....f5 try 31. f4>

31...f4!

This povides an escape for the WK <and> a retreat for the N(!)

32.fxe4 Bxe4

(!)

33...Kf7 (33.Rd4 Bxg6) 34.Rd3 Rd4;

Fighting for the file;

35.Rxd4

Anyway!

35...cxd4 36.Bd3!


click for larger view

The point. Now the BB becomes worse and not only does W have an extra pawn, but the latter should make the difference on the Q-side.

Peace!

Aug-20-10  ZUGZWANG67: Corrections...

ZUGZWANG67: <Once: <dzechiel> <paavoh> In your line, after 30....f5 try 31. f4>

31.f4!

This povides an escape for the WK <and> a retreat for the N(!)

31...fxe4 32.Bxe4

(!)

32...Kf7 (32...Rd4 33.Bxg6) 33.Rd3 Rd4 (33...Ke7 34.Rxd7 Kxd7 35.Bxg6);

Fighting for the file;

34.Rxd4

Anyway!

34...cxd4 35.Bd3!


click for larger view

The point. Now the BB becomes worse and not only does W have an extra pawn, but the latter should make the difference on the Q-side.

Peace!

Aug-20-10  unferth: I fell for Nb3
<Once> just wanted to say how much I routinely enjoy your posts--for both the incisive analysis & the pure writing talent. thanks.
Aug-20-10
Premium Chessgames Member
  OhioChessFan: <benveniste: I found 28. ... cxb4. Then after the forced 29. axb4 recapture, both 29. ... b3 and 29. ... f5 looked equally good to me. >

I am surprised nobody else went for 28...cxb4 I think 29...f5 is a bit stronger. 28...cxb4 29. axb4 Nb3 30. Rb1 and an eventual c5 gives White a little pressure on the Queen side.

Aug-20-10  wals: I went for Nb3 (-2.16). No way could I calculate it through for a win. f5 was rated at -1.83.

White stumbled, according Rybka3 1-cpu:

(-0.66.)25.Bxd6+. Better,Bf3 Bg2 or Bh1 all -0.12. depth 18.

(-1.33.)26.Bg2. Better, Be4, -0.66, or
Bh1, -0.94. depth 18.

(-1.66.)27.Ne4. Better, Re1, -1.33.
depth 18.

(-2.45.)36.Rd1. Better, Kg2,-1.78.
depth 17.

White with 2 pawns for a Knight resigned move 40.

Aug-20-10  scormus: I think I made a good decision not to try this one today .... and if my work boss knew he'd agree. A weekend puzzle, on Friday.
Aug-20-10  ZUGZWANG67: Next time I do analysing "after puzzle" I will move the pieces OTB. I promise.

You'll probably have noticed that enormous inacuracy in my last post. Sorry about that.

Aug-20-10  M.Hassan: <OhioChessFan: I am surprised nobody else went for 28...cxb4>

<zooter> went for it first, I was the second and others have gone for it too.

Aug-20-10  tacticalmonster: 1) e4 knight does not have too many squares to go

2) White has weak backrank

3) Black has pressure down the d-file

4) Black should play for dark square

Candidate: 28 Nb3 and 28 f5

a) 28...f5 29 Nc3 (if 29 Nd2 Nb3! winning) Nb3 30 Rxd7 Rxd7 31 Rd1 Nd2+ 32 Rxd2 Rxd2

b) 28...f5 29 e3 Nb3 30 Rxd7 Rxd7 31 Rb1 Na1! 32 bxc5 fxe4 33 cxb6 axb6 34 Rxb6

c) 28...Nb3 29 Rxd7 Rxd7 30 Rb1 (30 Rd1 f5 ) f5 tranpose to b)

Aug-20-10  C4gambit: Okay, I got the first move right, a huge success since this is friday puzzle! I analyzed all moves of the white knight and came to the conclusion that it wins at least a knight, if not a rook and even has mate threats!

Now the continuation! Oh! White didn't even move the knight. Instead he challenged black night with his own pawn. I certainly didn't see that defense, but I was happy to see that black could get the white knight at the end, although lost a pawn. Should be a win from here. I give myself 7.5 out of 10 for this one. I believe I could have grabbed an advantage although I didn't see white's e3 defense at first.

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