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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



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Kibitzer's Corner
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Premium Chessgames Member
  Phony Benoni: Looks like we're talking about a move of d4 knight, discovering an attack on the Rd1. But none of the knight's moves are threatening enough to avoid defenses like Rxd7. But if the knight were in the way, say on maybe 28...f5? Now 29.Nd2 Nb3 exploits the pin, and 29.Nc3 Nb3 30.Rc2 Bxc3, and whether White captures on d7 or note there's a mate threat on d1.

Plenty of other stuff, since it is Friday, but that looks like the idea.

Aug-20-10  zooter: This took me an entirely long time to figure out and I'm not 100% sure, but here goes

28...cxb4 29.axb4 Nc2! wins the b pawn as

a) 30.Rxc2 Rxd1# is silly for white while
b) 30.Rxd7 Rxd7 maintains the threat on the b-pawn and if 31.b5 Bb7 32.Rb8 Na6 piles up the attack on the c-pawn

Not sure if this is the solution, but seems good enough for a win to me

Time to check

Aug-20-10  zooter: Ok, Totally missed it. 28...f5 was one of my initial candidates but I rejected it rather hastily because of the counter e3
Aug-20-10  Blunderdome: I don't think I understand what happened in the game.
Aug-20-10  dzechiel: Black to move (28...?). Material even. "Difficult."

Black's dominance of the d-file, as well as his control of the a1-h8 diagonal, along with white's weakness on the first rank makes this one easier than most "difficult" positions.

It looks to me like white can start with either

28...f5, or

and they will likely transpose. However, I think that


is the most straightforward line. Black threatens both 29...Nxc1 as well as the much more devastating 29...Rxd1+ (leading to mate). White's only response is

29 Rxd7 Rxd7

and now the remaining rook is still under attack. 30 Rc2 is out of the question due to 30...Rd1# mate. 30 Ra1 is also no good because of 30...Bxa1. That leaves two choices:

- 30 Rb1
- 30 Re1

Both of these moves are met with 30...f5. For instance

30 Rb1 f5

and the knight has no flight square. 31 Rxb3 is no good because of 31...Rd1#. The same goes for 30 Re1.

I think this is it. Time to check.


I see the game took my other candidate move, but I think my line is cleaner. Time to check the kibitzing.

Premium Chessgames Member
  Jimfromprovidence: After being wrong the past two days, I'm happy to say I saw 28...f5.

click for larger view

This move in effect pins the knight because the open squares for the knight are no good.

29 Nc3 leads to 29...Nb3, uncovering a double attack on the c knight and the c rook. 29 Nd2 also leads to 29...Nb3 and is worse for white because it loses a full piece.

I followed the text through move 32 then diverted with 33 Ke2?!, attacking the rook, seeing 33fxe4 34 Bxe4, hoping to force the rook to give up protection of the knight on b3.

click for larger view

Black escapes like Houdini after 34Rd2+ 35 Ke1 Rb2.

click for larger view

Neither 36 Rd1 nor 36 Bxg6 are helpful because of 36...Bc3+.

Premium Chessgames Member
  paavoh: I saw the 28.- Nb3 line <dzechiel> has analyzed. 28.- f5 also occurred to me but the former seemed much clearer.
Premium Chessgames Member
  Once: <dzechiel> <paavoh> In your line, after 30....f5 try 31. f4

click for larger view

The back rank mate threat has gone, and both the white knight and black knight are attacked. I would rather be black, but I don't think that the advantage is as great as the 28...f5 line.

Aug-20-10  M.Hassan: "Difficult"- Black to play 28....
Materials even

Black Knight is supported by Bishop and Rooks and black pawn on c5 seems to be extra too many support that is not needed. Furthermore, bxc5 can cause separation of black pawn structure that is not desired. Therefore, I think the game has continued with 28....cxb4

29.axb4 f5
30.Nc3 Nb3
31.Rxd7(forced) Rxb7
32.Rd1 Nd2+
33.Ke1 Bxc3
34.Rc1 Bxb4
By now, Black is a Knight and a pawn up and by the next move that is a discovered check, can gain more material and on grounds of material superiority, I think Black has won. Too tired, can not continue more.

Aug-20-10  iiijaymaniii: I think f5 in necessary over b3 as it forces e3 with best play allowing rd3 to protect the b3 square as occurs in the game continuation. If Nb3 first, ... rxd7
rxd7, rb1
f5 then kg1 allows the escape and the black rook cannot come to d3 to protect the knight on b3
Premium Chessgames Member
  Once: The wedding photographer.

Right, can I have just the bride and groom please? Yes, sir, you stand just there. Turn to your left a little, chin up. Both chins up. That's lovely. And if you can breathe in a little, sir - your tummy's casting a bit of shadow. That's great.

Now for the lovely bride. Ah, very tall .... that's a problem ... let's find a box for the groom to stand on. Can't have you looking like Tom Cruise and whats'er name... the pretty ginger one ...

Ah, another tummy problem. Madame, can we have a bouquet to park in front of your ... bump? Looks like I might have to finish these off quickly or we'll be doing the rest in the delivery room of the hospital. That's lovely. Now, shoulders back and chest out. Not that far, madame, this isn't a wide angled lens. That super.

Are you sure you want to do these with the veil up? Um. Okay. Now hold still and say "cheese"...

The very next day, the local paper carries a gruesome story of a local photographer strangled by a groom's cummerbund.

Today's POTD is just like a wedding photograph. Black is poised to trigger the battery along the d file with Nb3, but the picture isn't quite right. Before he fires, he needs to arrange the pose a little. Maybe the fat kid in the front row is picking his nose or the mother of the groom is trying to stand in front of the bride.

The problem is the white Ne4. This not only threatens bc bc Nxc5, but it also defends the d2 square. So following on from our theme of the week, the solution is a little nudge with 28.... f5 followed by Nb3. The white knight has no safe escape squares.

That's lovely. Now can we have the groom's family?

Aug-20-10  chopin4525: My thoughts were lead by a sacrificial line
33.c5,Kxd7 (=).
But I see it was wrong because it throws away the advantage. There's no way, I truly love sacrifices. xD
Aug-20-10  gmalino: Yes <Once> described the situation very clearly and precise! I followed the same thought then <dzechiel> with 28...Nb3, thought this would be more forcing, but No, the calmly played f5 is the move that nedds to be played to intense the pressure. That's why difficult is the right description for this puzzle, if Nb3 would work directly it would be simple.
Aug-20-10  JG27Pyth: I had Nc2... it doesn't really lead to anything.

All the puzzles this week have been extraordinarily practical.

Premium Chessgames Member
  Willber G: Nope, I still think Nb3 is best first as it carries more threats and nullifies white's e3. An exchange of rooks is forced (otherwise the exchange is lost), then an escape attempt by the R(d1-f1), then f5 trapping the knight.
Premium Chessgames Member
  agb2002: The material is even.

The white knight does not have too many squares to move. This suggests 28... f5:

A) 29.Nc3 Nb3

A.1) 30.Rxd7 Rxd7

A.1.a) 31.Rb1 Nd7+ 32.Ke1 Nxb1 33.Nxb1 cxb4 34.axb4 Rc8 35.Nd2 (35.Na3 Bb2) Bc3 with a won ending.

A.1.b) 31.Rc2 Bxc3 - + [N] (32.Rxc3 Rd1#).

A.2) 30.Rb1 Bxc3 31.Rxd7 Rxd7 - + [N] (32.Rxb3 Rd1#).

A.3) 30.Ke1 Nxc1 31.Rxc1 Bxc3 - + [R] (32.Rxc3 Rd1#).

B) 29.Nd2 Nb3

B.1) 30.Rc2 Rxd2 31.Rcxd2 Rxd2 - + [N].

B.2) 30.Nxb3 Rxd1+ 31.Rxd1 Rxd1#.

B.3) 30.Rb1 Nxd2+ 31.Ke1 Nxb1 - + [R].

C) 29.e3 Nb3 30.Rxd7 Rxd7 31.Rb1 Rd3

C.1) 32.Ke2 fxe4 33.Bxe4 Rc3 34.Bxg6 cxb4 35.axb4 a5 - + [N vs 2P].

C.2) 32.bxc5 fxe4 33.Ke2 (33.cxb6 Nd2+) Nxc5 - + [N vs P].

Aug-20-10  Chesschatology: <Once> Nice spot! I think that defence is what makes this puzzle "difficult". I calculated 28 ... f5 through to a win and decided that was good enough for me, without bothering to analyse 28... Nb3 fully. If I'd analysed Nb3 first, I would have probably chosen that move instead.

Perhaps this puzzle is not so much a story about a Wedding photographer, as about a groom offered two possible engagement rings by a jeweller. They each seem to sport a fabulous diamond, and so he chooses the one whose design most appeals to him. It just so happens that the other diamond had a tiny, hidden flaw and was worth far less. He congratulates himself on his good taste, and never realises his luck.

Premium Chessgames Member
  OhioChessFan: I think 28...bxc4 29. axb4 f5 is a little cleaner version
Aug-20-10  gofer: The white pieces are in bad shape. Ne4 has almost no where to go (c3 or d2) and black is threatening Rxd1+ Rxd1 Rxd1# at some point. So lets apply pressure to the knight.

28 ... f5

Moving the knight is disasterous...

29 Nd2 Nb3
30 Rc2 Nxd2+
31 Ke1/Kg1 Nf3+ 32 exf3 Rxd1+ Ke2/Kh2 winning a whole rook!

29 Nc3 Nb3
30 Re1 Nxc1 31 Rxc1 Bxc3 winning
30 Rxd7 Rxd7 31 Rd1 Nd2+ winning
30 Rb1 Rxd1+ 31 Rxd1 Nd2+ winning (Nxd1 Nd2+ winning the rook)

So the knight must stay en prise!

29 e3 Nb3

Now white is in deep trouble... fxe4, Nxc1 and Rxd1+ all loom over the horizon.

30 Rxd7 Rxd7

White has dealt with Rxd1, but still has fxe4 and Nxc1

31 Rb1 Rd3

White has dealt with Nxc1, but still has fxe4, but cannot now move Ne4 as this would allow Nd2+ winning the rook!

32 Ke2 ...

Now I am not saying the next bit is right it is just a possibility...

32 ... fxe4
33 Bxe4 Rd2+
34 Ke1 Rb2
35 Rxb2 Bxb2
36 bxc5 Nxc5
37 Bxg6 Bxa3

At which point black is a pawn down, but a full knight up and a a pawn is free to run, so I would say that this was done and dusted... ... Time to check what really happened!

Aug-20-10  David2009: E R Lundin vs Julio Bolbochan, 1954 Black 28...?

Level material. Black can pick up a Pawn: 28...cxb4 29 axb4 Nc2 30 Rxd7 Rxd7 and now 31 Rxc2?? Rd1# and 31 b5? fails to Bb2. Best may be 31 d3 Nxb4 32 c5 etc with some drawing prospects. Time to
Missed it. 1/2 so far this week after three days without the Internet (a hazard of rural France).

28...f5! is definitely the move. My line is weak, since after 32 c5 bxc5 33 Nxc5! gives White good play a pawn down. I had rejected 28...f5 because of 29 Nc3 supporting d1, so that 29...cxb4 30 axb4 Nc2?? no longer works: 31 Rxd7 Rxd7 32 Rxc2 1-0. I had missed 29...Nb3! winning material <Jim, agb2002>.

Aug-20-10  gofer: White sensibly avoided my continuation and played Kg1. After that I didn't see black's Be5 protecting Rb8+, which was a very nice move, but all in all pretty close... 9/10 :-)
Premium Chessgames Member
  sethoflagos: I found 28..f5, but then how does it go?

Not sure there's much better than 29 Nxc5

Aug-20-10  et 9: I only saw after a few minutes, 28...cxb 29.axb Nc2! winning a pawn (the rook can't take before or after the pawn grab by the knight because of the threat of back rank mate) and focusing on the passed a-pawn. Let's see what others found.
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.]]
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