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Andrey Stukopin vs Benedict Hasenohr
Wch U14 (2008), Vung Tau VIE, rd 1, Oct-20
Formation: King's Indian Attack (A07)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Jan-07-09
Premium Chessgames Member
  ZUGZWANG67: Sorry about this one, guys ! :0)
Jan-07-09  ruzon: Black really helped White out here with 22...♘xf4+ and 23...g6. Had he played those moves earlier, he maybe could have held on:

20. ... ♘xf4
21. gxf4 g6
22. ♕h6 ♖g8
23. ♖h1 ♖g7
24. ♖h2 ♔g8
25. ♖ah1 ♔f8

but the truth is that he was in trouble as early as 9. e5.

Jan-07-09  xrt999: < sfm: So, it appears that Black could not play 15.-,Bxg5 and simply continue with a slow advance on the queen's wing. Where's the decisive mistake? >

1.Working backwards, It appears that after 20.Kg2, I cant find a way for black to defend, and CM actually suggests the line involving ...Nxf4 losing the knight as the best option for black. I also looked at 20...Re8 which just loses outright.

2.CM suggests 16...Nd4 17.Qd2 Rfe8 18.c3 bxc3 19.bxc3 Nc6 is equalizing for black at 10 plies, attacking the e5 pawn (and d3) and kicking white's queen of the d1-h5 diagonal.

3.I asked myself is there any way for black to continue by avoiding 15...Bxg5 to preserve the h-file? I didnt find any other games in the CM database with this exact position, but moves I looked at were 15...h6 and 15...g6 which both lose to 16.Nxd5. The only other option I looked into was 15...d4 which CM says is 0.19 at 10 plies. CM still thinks the best move is 15...Bxg5 though, as it leads to the second line which favors black as in 2 above.

4.Instead of 17...Ne7, CM suggests 17...Rfe8 leaving black the option of 18...Nd4, attacking c2 threatening to fork the rooks. It also guards f3, preventing Kg2 and keeping white from developing the open h file. This knight is suprisingly hard to kick off d4 and temporarily stops white's development.

5.Lastly, the move I looked at is 8...0-0, that is to say, black is allowing white to play the central push 9.e5, where the pawn sits for the rest of the game like a bone in black's throat. I tend to play 8...dxe4 9.Nxe4 0-0 as black in this opening to avoid the uncomfortable 9.e5, which I find hard to deal with. From an opening standpoint, I am sure there is someone more qualified to explain which is better and why.

So, from my perspective, white's e pawn and the open h-file win the game, so black's goal in this opening would be to try to defuse these 2 strengths.

Jan-07-09  fouard: 24 Qxh7+ forces Nxh7. 25 Nf6 leaves black helpless to the mate threat at h7. If 25...Rg7 26 Rah1 is mate in 2. And if 25...Kg7 26 Rxh7+ Kf8 27 Nd7+ Ke7 (or Ke8) 28 Nxb6. Black has won a piece and a pawn, and has control of the h-file, and far more active pieces. Last but not least, the knight is not trapped, as often happens when a player thinks he has won material deep in enemy territory.
Jan-07-09
Premium Chessgames Member
  OBIT: <YouRang> laments that Black's threat to capture the queen kinds of telegraphs the sacrifice. Actually, though, this threat is needed to make the sacrifice necessary for the forced win. For example, put the queen on h4, and I'd say best is 24. Nf6. With the f-pawn unable to move, mate is forced: 24...h5 (or 24...Rg7 25. Rah1 h5 26. Qxh5+) 25. Bxh5 forces mate, e.g. 25...Kg7 26. Bf3 followed by Qh6.

As for some of the other posts I read here, uh, gee... you sac the queen to force an Arabian mate, except there is no forced mate. It's darn fortuitous that knight fork to skewer the queen falls out of the sky at the end of this combo. Put the Black queen on c6 instead of b6, and the "obvious" 24. Qxh7 leaves you dead lost after 24...Nxh7 25. Nf6 Kg7.

Jan-07-09  YouRang: <OBIT: <YouRang> laments that Black's threat to capture the queen kinds of telegraphs the sacrifice. Actually, though, this threat is needed to make the sacrifice necessary for the forced win. For example, put the queen on h4, and I'd say best is 24. Nf6. >

A good point.

Jan-07-09  MarbleSkull: Yeah, this puzzle must be easy, if it's one of the three I've gotten so far.
Jan-07-09  NakoSonorense: Easy easy easy. Not hard at all to see the open file with the possibility of aligning the Q + 2R and attack the weak h-pawn.

The Knight is also a key component, of course.

Jan-07-09  TheBish: A Stukopin vs B Hasenohr, White to play (24.?), "Medium/Easy" (2 stars) Candidate moves: 24. Qh6, 24. Qxh7+
These are the only two moves I really considered (given that the queen is attacked). I assumed this was another queen sac (being a puzzle), but of course you can't assume anything!

24. Qh6 is good enough to win a pawn, forcing 24...f5 (or f6) to defend h7: 24. Qh6 f5 25. gxf6 (or 24...f6 25. Nxf6). Otherwise, this occurs: 24. Qh6 Rg7 25. Nf6, and Black is helpless to stop mate, e.g. 25...c4 26. Rah1 cxd3 27. Qxh7+! Nxh7 28. Rxh7+ Rxh7 29. Rxh7 mate. Amazing! Black's king is so bottled up, he is helpless (after 25. Nf6) to stop a mate four moves later. But, with best defense, this only wins a pawn.

On the other hand, crushing is 24. Qxh7+!!. After 24...Nxh7 25. Nf6 Rg7 26. Rah1, and no matter what he does, Black can't stop mate in two, starting with 27. Rxh7+. So, Black may want to try 25...Kg7, but will lose a piece (and soon the game) after 26. Rxh7+ Kf8 27. Nd7+ K(any) 28. Nxb6, regaining the queen and thus netting a knight. Very instructive tactic! It all works, thanks to Black's queen being on the fork-friendly square b6.

Nov-21-18  Walter Glattke: 25.-Rg7 26.Rh6 Qd8 27.Rah1 Qxf6 28.exf6 Rcg8 29.fxg7+ Rxg7 (R for N)
Nov-21-18  saturn2: I saw 24. Qxh7+ Nxh7 25. Nf6

25...Kg7 26. Rxh7+ Kf8 27. Nd7+ and

25...Rg7 26. Rah1

Nov-21-18
Premium Chessgames Member
  Penguincw: Time to use brute force and keep crashing into h7? Nope, only once.

If king runs away with 25...Kg7, then 26.Rxh7+ Kh8 27.Nd7+ wins the queen. After the smoke clears, white is up a full piece, and the knight is able to escape.

Nov-21-18  nalinw: <Walter Glattke>

Why 26. Rh6?

26. Rah1 will mate

Nov-21-18
Premium Chessgames Member
  agb2002: Black threatens gxh5.

White can resume the attack along the h-file with 24.Qxh7+ Nxh7 25.Nf6:

A) 25... Rg7 26.Rah1 and mate in two.

B) 25... Kg7 26.Rxh7+ Kf8 27.Nd7+ wins a piece and a pawn. For example, 27... Ke7 28.Nxb6 Rc6 29.Na4.

Nov-21-18  Whitehat1963: Saw the correct sequence, but didn’t see that the black king’s escape via g7-f8 leads to a knight fork and queen capture. Probably would have found it over the board, but I’ll only take partial credit for solving the puzzle.
Nov-21-18  TheaN: I was certain I recognized this one and I KNEW the fork on d7 played a part. However, as blind as am compared to my 2009 self I completely failed to realize Black played g6 to <attack the White queen> and actually wanted to start with <24.Nf6?<>>. Perfectly fine otherwise, as the triple threat on h7 forces mate if it wasn't for gxh5.

Interestingly, OTB this would never be played as Black played a threat in one the previous move. Everyone, even novices, see the Queen is en prise. Being a puzzle, such trivial threats can be overlooked in sense of calculating tough combinations.

I had however correctly visioned (if 24.Nf6 were to be impossible) <24.Qxh7+ Nxh7 25.Nf6 Kg7 (Rg7 Rah1 with mate) 26.Rxh7+ Kf8 27.Nd7+ +-> recognizing the combination from my 2009 self. My 2018 self however, throws Queens instead.

Nov-21-18  malt: Have 24.Q:h7+ N:h7 25.Nf6 Kg7 26.R:g7+ Kf8 27.Nd7+ Ke7 28.N:b6
picks up a piece and pawn.
Nov-21-18
Premium Chessgames Member
  Diocletian: 24.Qxh7+,Nxh7 25.Nf6. Black's only defense is 25...R-g7, But now 26.R/a-h1 renews the mating threat and Black has no further defense.
Nov-21-18  zb2cr: Okay, so 24. Qxh7+, Nxh7; 25. Nf6 puts Black in an impossible position. If he plays 25. ... Rg7??, White has a "Rook reloader" in 26. Rah1, which leads to obvious mate.

So it looks as though Black must submit to playing 25 ... Kg7; 26. Rxh7+, Kf8 when the second point of the combination occurs: 27. Nd7+ forking the Black Queen. Black will be down by N+P, as White's Knight has one escape square at a4.

Nov-21-18  Walter Glattke: Thanks, nalinw, second sac, I did n't expect.
Nov-21-18  Cheapo by the Dozen: Feels like a Monday puzzle to me ... oh, wait, the Black king can run for the exits.

OK -- Tuesday/Wednesday is fair. :)

Nov-21-18  laskereshevsky: Another HPAWN bites the dust!
Nov-21-18  ChessHigherCat: Q sac Wednesday. I thought this was a lot easier than Tuesday, maybe because when there's a Arabian mate we're programmed to go for it.
Nov-21-18  ChessHigherCat: Andrey stuck'a pin in the blessed rabbit's ear

It is kind of complex when you consider that the king can run for the hills, but it still loses a piece.

Nov-21-18  landshark: <TheaN> About your amnesia about recycled puzzles - it was just a couple of weeks ago I posted on a Friday that the puzzle was way beyond me, only to read my old post about the same puzzle, from last February, how it only took me 10 seconds to solve it... At least it's taking you nearly 10 years to regress as far as I'm able to in a matter of months -
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