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Juergen Dueball vs Gisbert Jacoby
Germany (1976)  ·  French Defense: Winawer. Advance Variation (C19)  ·  1-0
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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Apr-28-09  ennar: Would Rxb7 work?
Apr-28-09
Premium Chessgames Member
  Patriot: I completely missed 24.Qb6. I was so stuck on 24.Rxa7. For example, 24...Qxb1+ 25.Kg2 Nxa7 26.Qxa7 with 27.Qb8# threatened. But chess ain't checkers and black doesn't have to play 25...Nxa7?. Instead 25...Kd8 works fine and white can resign.

That should be a good lesson to look at ALL checks, captures, and threats before calculating further. What's worse is the analysis I did was flawed on top of that. :-P

Tonight, if my opponent shows up I'll be playing a few rated games OTB. Hopefully I will have a better performance!

Apr-28-09  gofer: After yesterday's, I was looking for something a little complex and I found it...

24 Bd1 which forces the black queen to retreat along the b1-h7 diagonal and also allows the white rook on a1 to move without the threat of Qxb1+ and instead it will just be Qxb1 without losing a move...

Probably Qe4 is the best reply for black as it has potential for Rxg4 and Qe1+

Then

25 Rxa7 seems to be unstoppable...

the best that black can do is lure the white queen away from protecting her king..

25 ... Nxa7
26 Qxa7

and now there are a number of mating chances for black with his one spare move but all of them fail leaving white with the mating finish of

Qa8#

or

... Kd8
Qb8+ Bc8
Qc7+ Ke8
Qe7#

So black ends up with no choice but to swap back the rook with

26 ... Qe1+
27 Kg2 Rxf2
28 Qxf2 Qxf2
29 Kxf2

which leaves white with an extra bishop and a definite win...

...so not as elegant as

24 Qb6

...but nobody's perfect...

:-)

Apr-28-09  YetAnotherAmateur: <petrie911: While 24. Qb6 is more forceful, the solution I came up with was 24. Bd1. I've been analyzing it, and can't seem to come up with a refutation for Black. Can anyone else?>

Bear in mind that we want a clear advantage when the dust settles. With that in mind, 24. Bd1 (which I looked at pretty closely) is met by Qe4. A possible continuation: 24. Bd1 Qe4
25. Qb6 Qe1+ (if no check, Qc7#)
26. Kg2 Qxf2+
27. Qxf2 Rxf2+
28. Kxf2

White is up a rook, so it's a winning position, but nowhere near the clear advantage in only a few moves that you'd expect from a Tuesday puzzle. Plus black still has his 3 extra pawns for white to worry about.

Apr-28-09  njchess: Sneaky puzzle! Thankfully I noticed that Black's king is not well positioned and his back rank is exposed should the a-file open up. I got Qb6 after concluding that capturing on a7 was doomed to fail.

Black's strategy is fatally flawed. The French defense is ill-suited for quick counterattacks (e.g. 9. ... Qa5) and for opposite side castling. Normally in the French we would see 11. ... 0-0 followed by 12. ... f6. This game illustrates the folly of 0-0-0 is this position.

16. g4!? was a risky move; Black could well have played Ng6 after Nfe7 which could have made White's game more difficult.

Black might have also been able to take advantage of 16. g4 with 18. ... Rf7 followed by Rf8. Instead, Black plays 18. ... Nxd4? which only helps White's attack by clearing away pieces.

After 20. Qe3, there is little Black can do except wait for the axe to fall. However, 20. ... g5? could have cost Black a rook, but instead White goes for the jugular with the finesse move 21. Rb5!. By now, White has already seen Bd6 followed by Qb6. A pretty ending sequence.

Apr-28-09
Premium Chessgames Member
  kevin86: The rooks,queen,and very dangerous bishop made the position look really juicy for a queen sac. I tried a7,but it failed to 24...Nxa7 25 Rxa7 Qxb1+. SO- 24 Qb6 threatens mate at c7 and is immune to capture on the penalty of 25 Ra8#
Apr-28-09
Premium Chessgames Member
  playground player: I would be extremely pleased with myself if I found this move in an actual game. As it is, two years ago I never would've found it in a puzzle.
Apr-28-09  JG27Pyth: Qb6! is a moderately tough move to see in the first place, but once you do see it, it's a piece of cake to analyze. It's the kind of move computers find in nanoseconds. A 'computer eyes' Charles Hertan sort of move.

I think most of us see the king cowering behind his pawns and the first instinct is to hurl pieces at the barricades. Other methods work too :)

If I'd found this OTB I'd be <thrilled> to see my opponent resign on the spot.

White is winning, but I don't think he has much margin of error. Black's extra pawns aren't completely insignificant. I think perhaps Jacoby felt he was over-matched in the first place, and with Dueball now holding a significant advantage he figured he wasn't going to be let back in the game.

Apr-28-09
Premium Chessgames Member
  crafty: 24. Bd1 d4 25. cxd4 Qe4 26. d5 exd5 27. Qb6 Rxg4+ =   (eval -0.01; depth 16 ply; 500M nodes)
Apr-28-09
Premium Chessgames Member
  YouRang: Seeing our bishop creating back rank problems for black, and our rooks hitting the semi-open a & b files, I was pretty sure that this was a matter of removing one of those pawns to allow either Ra8# or Rb8#.

Seeing that our Q can also strike the king position pretty well sealed the deal: 24.Qb8 threatens immediate mate, either by Qc7# or ...axb6 clears away the pawn as we wanted, leaving 25.Ra8#.

Precious little black can do about it without trading his queen for a rook.

Apr-28-09  solskytz: slightly less than a second - Qb6 simply came to me - the Black square pattern around the black K is simply irresistable with Q and B sitting on top of him...

First thing over, you look if such 'extreme measures' can work.

This time - voila!! they can

Apr-28-09
Premium Chessgames Member
  PinnedPiece: Ah, missed this clever little Tuesday puzzle.
Apr-28-09  TheaN: Tuesday 28 April

<24.?>

Target: 1:25;000
Taken: 1:04;150
Par: yes

Material: /-2{P&N / B\ B: Q + 2R + dsB; w: lsB + 5P b: N + 7P

Candidates: Rxa7, Qxa7, Rxb7, <[Qb6]>

-ML-
Took me a while to find the target here: active sacrifices on a7 and b7 do not work. The weak point is the back rank, and White has sacrificed his a and b-pawn to gain access to it. Now, he sees his Rooks stare at the standing pawns of Black, and as said, active sacrifices do not work due to the ultimately placed Knight on c6. No, White has to relay his target and does so in conjunction with the strong Bishop on d6.

<24.Qb6!> relaying to c7, which is a square Black cannot control and is a mate in one with Qc7 if Black passes. So, only active defense is in order. Taking the Queen is just what makes this puzzle.

/A\
<24....axb6 25.Ra8†> opening up the so valuable and vulnerable back rank.

<25....Nb8 26.Rxb8‡ 1-0> and the Bishop does the ultimate job of guarding the Rook and the escape squares; together with the Rook and the Black Bishop this makes a pure mate.

1) Pretty much any defense fails to this: if Black makes no move which is check or captures the Queen, 25.Qc7‡ follows.

2) 24....Rxg4† with 25.Kh1! Rg1† 26.Kxg1 and the same verdict as in the variation or as below.

3) 24....Qc1†/Qd1† with 25.RxQ and the same verdict again.

There is ONE move Black should play that could trap White in a very anti-climaxing way.

/B\
<24....Qxb1†> this move is essentially different from Qc1†/Qd1† as such that it captures a Rook and it either forces the a-Rook or the Queen to take back. If White hastily responds with 25.Rxb1??, then 25....axb6 pwns White right back in the face. After all, there is no Rook to deliver mate on a8 and b8.

<25.Qxb1 > but now it's pretty much over, Black still needs to defend b6 and c7 which is harder than it seems, and he is Queen for Rook down; in a more fatal manner than yesterday.

Time to check.

Apr-28-09
Premium Chessgames Member
  awfulhangover: Easy, but would I have seen it OTB? Prolly not.
Apr-28-09
Premium Chessgames Member
  TheBish: J Dueball vs G Jacoby, 1976

White to play (24.?) "Easy"

If it's Tuesday, it's time for a queen sac!

24. Qb6! leads to a forced mate, since 24...axb6 25. Ra8+ Nb8 26. Rxb8 mate.

Apr-28-09  GreenFacedPatzer: D'oh!

Almost! I saw Rb6, which is _almost_ as good, except that there may be some defense against it... quite a few lines need to be followed up on.

Apr-28-09
Premium Chessgames Member
  johnlspouge: < <zb2cr> wrote: [snip] My actual games are more like a realization of Tartakower's famous saying: "The mistakes are all there, just waiting to be found!" >

This saying reminds me of Michelangelo's comment about sculpture, that a sculpture already existed in the marble he would carve, and that his job was merely to chip away the pieces that were not the sculpture.

C'mon, <zb2cr>, something more inspirational, if you please ;>)

Apr-28-09  YetAnotherAmateur: <GreenFacedPatzer>
Rb6 is easily refuted:
24. Rb6 Kd8

After that, Rxb7, but there's not much else white can gain from that.

Apr-28-09  CHESSTTCAMPS: <ennar:> asked <Would Rxb7 work?>

Do you mean 24.Rxb7 from the puzzle position? After 24.Rxb7 Kxb7, do you have a specific continuation in mind? From that position, I can't find a white move that creates a compelling threat. If you can't answer the question "What is the threat?" with respect to a candidate that sacrifices a significant amount of material, you should probably discard it quickly.

Apr-28-09  ruzon: Like <dzechiel> and others, I tried to make 24. Rxa7 or 24. Rxb7 work before finding 24. Qb6!.

My question is why Black went with 20...g5?! allowing himself to go down the Exchange, and then compounded it with 21...Qxa4, trapping the Queen. My possible line goes: 21...Qd8 22. Rab1 Na5.

Both 23. Rxb7 and 23. Qxa7 seem to fail. 23. Rxb7 Nxb7 24. Qxa7 Qc7 and 23. Qxa7 Bxb5 24. Rxb5 b6!? 25. Rxb6 Rf7 are the best lines I came up with.

But if White thought that 21...Qd8 was a good save, he would have played 21. Bxf8, wouldn't he?

So what am I missing?

Apr-28-09  WhiteRook48: too bad I didn't know this kind of theme
Apr-28-09  zb2cr: Hi <johnlspouge>,

Sorry, I can't come up with anything more inspirational. I'm just commenting on the sad state of my OTB play vs. my ability to solve the puzzles here and elsewhere.

Apr-29-09
Premium Chessgames Member
  Once: Inspiration, hm? Try this:

Strangers are friends you haven't met yet.
Difficulties are solutions you haven't found yet.
Mistakes are solutions you will find next time.

Apr-29-09  zb2cr: Hi <Once>,

Ha! My games more resemble the more cynical adage: "Experience is valuable. It lets you recognize that you've just made the same mistake again, moments after it's too late to remedy the problem."

Apr-29-09
Premium Chessgames Member
  gawain: This is a wonderful move reminding me just a bit of Frank Marshall's famous 23...Qg3! in S Levitsky vs Marshall, 1912
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