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Zoltan Ribli vs Wolfgang Unzicker
Bundesliga (1985/86), FRG
English Opening: Anglo-Indian Defense. King's Knight Variation (A15)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Mar-03-10  zb2cr: Oh bah. I only looked at the puzzle superficially and concluded that 34. Bc6 was the right way.
Mar-03-10
Premium Chessgames Member
  wordfunph: not too obvious move 34.b6!
Mar-03-10  eric the Baptist: This was easier than Monday or Tuesday.
Mar-03-10
Premium Chessgames Member
  gawain: I agree with those who said that this was too easy for a Wednesday.

Or maybe I am just getting smarter!

Mar-03-10  desiobu: I also found this one easier than yesterday's.
Mar-03-10  Patriot: I found the solution 34.b6! pretty quickly and took a little more time making sure it works. This is a good example that whenever pawns are advanced, look at ways to push them. The potential for tactics increase as pawns get further down the board.

Last night, while watching an OTB 10-minute game, I noticed that black had a pawn on the 6th rank which was over-protected by doubled rooks and blockaded by the white queen. White moved his knight, attacking the queen, and I instantly saw that 1...QxR! 2.QxQ e2 pushes the pawn through without counterplay. Black assumed that he couldn't take the rook, so he moved it to a safe square. White kept giving black the opportunity, move after move, to take the rook but he didn't. Sure, it was only a 10-minute game and black had about four minutes left and I had the advantage of being an onlooker with no time pressure but I have to believe that if black had a more efficient thought process (look at forcing moves first and realize that tactics potential is high with advanced pawns) he would have seen it. Or familiarity with that pattern would have helped as well.

Mar-03-10  turbo231: Some people say that today's puzzle was easier than Tuesday's, maybe... maybe not. I think the critical move to set up the end game was that you had to take the rook at a8 (a7=Queen RookxQa8 Bb7xRa8)with the bishop. If you do that you end up with a rook and a bishop and black ends up with nothing. Because you can't get mate right away, the King will drop a pawn to make room for a escape. Or more likely move over to f8. By taking the rook with the bishop that forces the rook at c7 to take the pawn at d7,( or the pawn at c7 will promote to Queen, and there's nothing black can do about it). That's how you end up with a rook and a bishop and black ends up with nothing but 4 pawns. And the King will be blocked out by the Rook at d7. A very easy end game. Now i'm going to take this knowledge and play Rybka.
Mar-03-10  SetNoEscapeOn: This was easy because there weren't even any other tactical possibilities in the position; there is literally nothing else to calculate except b6.
Mar-03-10
Premium Chessgames Member
  patzer2: The two key moves turning the game in White's favor are:

22. d4! , advancing a potential passer and blocking the Bishop's attack on f2, and

23. a5! , exchanging a Rook for a Bishop and two pawns -- which in general calculations is an even trade, but in this position, with a couple of potential passers, proves to be decisive.

Mar-03-10  SuperPatzer77: <patzer2>: <If 34. Bc6, then 34...Kf8 35. f4 wins but it's difficult and slow. Even more difficult is 34. Bc6 Kf8 35. Re1 Rcxd7 36. Bxd7 Rxd7 37. Ra1 .>

<patzer2> You're absolutely right. 34. b6! leads to the rank mate or the material advantage.

In my opinion, 34. b6! is much simpler and faster than 34. Bc6 or Bc8. It gives White strong tactics when it is Zoltan Ribli's move - 34. b6!.

34. b6! axb6, 35. a7 Rxb7, 36. a8=Q below:

a) 36...Rxd7, 37. Qxd8+! Rxd8, 38. Rxd8#

b) 36...Rbb8, 37. Qxb8! Rxb8, 38. d8=Q+ Rxd8, 49. Rxd8#

c) 36...Rxa8, 37. d8=Q+ Rxd8, 38. Rxd8#

1-0

SuperPatzer77

Mar-03-10
Premium Chessgames Member
  YouRang: I missed the quick win 34...b6. Instead, I became infatuated with how wonderfully 34...Bc6 locks up black's rooks, even though Black can give back the exchange and accept a pawn-down endgame.

Still, I think white can win that ending because of the far advanced pawns.

Anyway, 34...b6 is clearly the quick and certain win -- a well-deserved prize for people who don't just jump at the first move that interests them.

Mar-03-10
Premium Chessgames Member
  doubledrooks: <zooter> wrote: <Amazing stuff and no wonder I'm addicted to chess.>

Great comment, <zooter>.

As for today's problem, 34. b6 threatens to open a path for the white a pawn to head to a8 after 34...axb6, leaving black lost in all variations.

Mar-03-10
Premium Chessgames Member
  chrisowen: Polished type of composition, Zoltan could allez the queenside passer. Does a6 pawn think I am a deus ex machina? Wolgang cranes his neck with 33..Rc7 yet the key b5 - b6 is the trap door. He belies his experience with 27..Rc4 when 27..Qb2 threatening Qxb4 looks more ave verum corpus. In a lot of this plot it is the a7/d7 devices that score it for him.
Mar-03-10  turbo231: I meant to say the rook at c7 has to take the pawn at d7 or the pawn at (d7) will queen and black can do nothing about it. I played Rybka i thought rybka would move to the king to f8 but she dropped a pawn. It didn't matter the game ended up the same way. White had a rook and bishop, black had 4 pawns. Of coarse the first move is b6.
Mar-03-10
Premium Chessgames Member
  Jimfromprovidence: <Random Visitor> indicated that 27 b6 wins. That move looks good, it's a more complicated version of today's puzzle.

On that same note it appears white erred with 27 d5?!, allowing 27...Qb2, (threatening the white bishop), which black did not pick up on.


click for larger view

The question is can white sacrifice the bishop and still play 28 b6?

Mar-03-10
Premium Chessgames Member
  Once: Sometimes you've got to feel a little sorry for the humble prawn.

As most chess tactics involve a double attack, the poor lumbering foot soldier just can't compete. A prawn can't pin, can't skewer and can only just about fork ... and then only if the opponents stand in exactly the right spot...

But like the Zulus at Rourke's Drift, prawns do have one advantage over the better armed aristocrats of the chess boards - numbers. What prawns lack in firepower, they can sometimes make up for by bringing along a friend or two.

Today's puzzle relies on two fairly standard pawn promotion tricks. Here's the first one:


click for larger view

The black a7 pawn seems to hold back both white pawns, but this is just an illusion. With 1. b6, white creates a double threat - he will either crown the b pawn (if black does nothing) or 1...ab 2. a7 and the a pawn queens.

The second trick is this one:


click for larger view

Again, the black rook seems to have it all under control but is quickly overwhelmed by pawn numbers. 1. a8=Q Rxa8 2. d8=Q. One pawn could be held back, but two are deadly.

Combining these two motifs, and chucking in the extra bishop and rook, and we get today's pleasing little puzzle where the pawn Zulus overrun the British soldiders led by Stanley Baxter and Michael Caine.

BTW, one of my favourite promotion tricks is this one:


click for larger view

Black cannot prevent white from queening one of the pawns. Even if we give black two consecutive moves, he still cannot prevent a pawn from queening.

So perhaps the humble prawn is not so humble after all. And let's not forget that the Zulus may have been unable to win at Rourkes Drift, but they were rather more successful at the battle of Isandlwana just a few hours before...

Mar-03-10  hedgeh0g: The fact that the position was so simple made this puzzle even easier than usual. A simple glance at White's advanced queenside, coupled with Black's tied-up rooks and weak back rank leaves b6! as the breakthrough move.
Mar-03-10  Marmot PFL: 34 b6 was about the only serious candidate, combining promotion themes with back row mate threats.
Mar-03-10  wals: GEORGE BERNARD SHAW

" Chess is a foolish expedient for making idle people believe they are doing something very clever when they are only wasting their time".

and there is more on :-

http://www.notable-quotes.com/s/sha...

Mar-03-10  jsheedy: ...b6!
Mar-03-10  David2009: Wednesday 03/03/2010 puzzle Ribli vs Unzicker, 1985 White 34?

34 b6! promotes a Pawn. Some variations:
(A)...R(either)xd7 35 Rxd7 Rxd7 36 bxa7 1-0
(B)...Rxb7 35 axb7 etc
(C)...axb6 35 a7 etc
Time to check:
=====
Everyone has said it all.

Mar-03-10  randomsac: b6 lets another pawn through.
Mar-03-10
Premium Chessgames Member
  sfm: <wals: GEORGE BERNARD SHAW

" Chess is a foolish expedient for making idle people believe they are doing something very clever when they are only wasting their time".> I have known this quote for 35 years. He's so right! LOL!

Mar-03-10  TheBish: Ribli vs Unzicker, 1985

White to play (34.?) "Medium/Easy"

Thanks to the weakness of Black's back rank, White wins with a pawn breakthrough.

34. b6! axb6

Or 34...Rcxd7 35. Rxd7 Rxd7 36. bxa7 and queens next.

35. a7! Rxb7 36. a8=Q and Black can resign, since White mates after 36...Rxa8 37. d8=Q+ Rxd8 38. Rxd8#.

Mar-03-10  reti: Fisher was right: "Always watch for a back rank checkmate."
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