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Rainer Knaak vs Juan Carlos Fernandez Gonzalez
Halle DSV (1978), Halle GDR, rd 12, Nov-??
King's Indian Defense: Saemisch Variation. Normal Defense (E81)  ·  1-0



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Aug-23-09  PinnedPiece: 28 ? would have been enough of a puzzle to defeat me.


Premium Chessgames Member
  whiteshark: Way to hard for me.
Aug-23-09  wals: [Event "Halle"]
[Site "Halle"]
[Date "1978.??.??"]
[Round "?"]
[White "Rainer F A Knaak"]
[Black "Juan Fernandez"]
[Result "1-0"]
[ECO "E82"]
[WhiteElo "2484"]
[BlackElo "2396"]
[Annotator "Rybka 3 1-cpu (30m)"]
[PlyCount "55"]

{E82: King's Indian: Smisch:

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5.
f3 O-O 6. Be3 a6 7. Qd2 b6 8. O-O-O c5 9. dxc5 bxc5 10. e5 Ne8 11. exd6 Nxd6 12. Nd5 Nd7 (12... Nc6 13. Bxc5 $11) 13. Bg5 $11 f6 14. Be3 (14. Bf4 e5 15. Nc3 Rb8 16. Qxd6 exf4 ) 14... Nf5 (14... Rb8 15. h4 f5 16. b3 ) 15. Ne2 (15. g4 Nxe3 16. Qxe3 Rf7 ) 15... e5 (15... e6 16. Ndc3 Qa5 ) 16. h4 Bb7 16... Rb8 17. h5 ) 17. h5 Nb6 ♗lack threatens to win material: ♘b6xc4 ( 17... Nd4 18. Nec3 (18. Bxd4 cxd4 (18... exd4 19. Nef4 Bxd5 20. Nxd5 ) 19. hxg6 hxg6 )) 18. Nec3 Ng3 (18... Rc8 ) 19. h6 Bh8 ? (19... Rf7 20. hxg7 Nxh1 ) 20. Bxc5 Nxd5 21. cxd5 (21. Bxf8 Nxh1 22. Nxd5 Qxf8 ) 21... Nxh1 ? (21... Rf7 22. Bc4 Nxh1 ) 22. Bc4 (22. d6 Qd7 23. Bc4+ Rf7 24. Qc2 (24. Rxh1 Rc8 2 Qe3 f5 )) 22... Rc8 ? (22... Rf7 23. d6 Qd7 ) 23. d6+ Rf7 24. b4 (24. Na4 Nf2 25. Qxf2 ) 24... Ng3 ?? (24... Nf2 25. Qxf2 Qd7 ) 25. d7 Rxc5 26. bxc5 Nf5 (26... f5 27. Qd6 Bg7 28. Bxf7+ Kxf7 29. hxg7 Bxf3 30. Qf8+ Qxf8 31. gxf8=Q+ Kxf8 32. d8=Q+ Kg7 33. Rd7+ Kh6 34. gxf3 a5 35. c6 Nh5 36. c7 e4 37. c8=Q a4 38. Rxh7+ Kxh7 39. Qh8#) 27. Qb2 Ne3 ( 27... Kf8 praying for a miracle 28. Bxf7 Nxh6 ) 28. Qb6 (28. Qb6 Qf8 29. d8=Q Nd5 30. Qxf8+ Rxf8 31. Rxd5 Bg7 32. Rd7+ Bd5 33. Bxd5+ Rf7 34. Bxf7+ Kh8 35. Qd8+ Bf8 36. Qxf8#) 1-0

The above may be of interest to those seeking help.

Aug-23-09  David2009: Sunday's puzzle R Knaak vs J Fernandez, 1978 White to play 20? Difficult

Material is even. White has a Rook en prise. I was tempted by 20 Bd3 hoping for 20..Nxd5 21 cxd5 Bxd5 22 Bxg6 Nxh1 23 Qc2 Qd7 24 Nxd5 hxg6 25 Nxf6+ Bxf6 26 Rxd7 and wins. This is a six-move combination beyond my reliable calculating powers, and it has a large hole: 20 Bd3 Nxh1 21 Bxg6 hxg6 (Black is B and R ahead) 22 Qc2 f5 and Black wins. Try instead 20 Bxc5 Nxd5 21 cxd5 Nxh1 22 Bc4 threatening mate and giving a powerful attack whatever Black plays. It is now 23.40 local time, check quickly:
I got the first three moves. The position and solvers' comments will still be there in the morning. Off to bed.

Premium Chessgames Member
  johnlspouge: Sunday (Insane):

R Knaak vs J Fernandez, 1978 (20.?)

White to play and win.

Material: Even. The Black Kg8 has 1 legal move, to f7, because Ph6 cramps the Black K-position. Black is essentially a piece down with Bh8 and 2 defensive pieces down with Ng3. Black threatens 20Nxh1. The White Bf1 requires activation. The White Kc1 is secured from check, except the pointless 20Ne2+.

Candidates (20.): Ne7+, Nxf6+, Bxc5, Nxb6, Bd3

20.Bxc5 (threatening 21.Bxb6 or 21.Bxf8)

Black must capture to avoid material loss.

(1) Black can accept the passive sacrifice of Rh1:

20Nxh1 [Nxf1 21.Rhxb1 drops a P]

21.Bxb6 (threatening 22.Qe1, trapping Nh1)

Black cannot counter-attack the White center to save Nh1, because Nc3 can reload Nd5, the protector of Bb6, and because the base Pc4 is stable (e.g., Pb2-b3). Black loses 2N+P for R, a strong advantage against the cramped Black Kg8.

(2) 20Bxd5 21.Nxd5 Nxd5 [else, the threats in Variation (1) ensue]


With Bb7 exchanged for the passive Nc3, Variation (2) is worse than Variation (3).

(3) 20Nxd5 21.cxd5 Nxh1 [else, drop a P]

22.Bc4 Rc8

23.b4 Ng3 [else, drop Nh1, for little position improvement]

24.d6+ Rf7 25.Nd5 (threatening 26.Nf7+ 27.Rc8)

I returned today from a vacation, so I had no time to complete the analysis. I thought that despite the material deficit, however, the sacrifice 20.Bxc5 led to an overwhelming position. Given the game, and particularly the next move (25...Rxc5), Black obviously agreed with the assessment.

Premium Chessgames Member
  johnlspouge: <RandomVisitor> corrects my Variation (2) with his Variation 5 (which I saw, but then promptly forgot!?). To complete it by memory:

20.Bxc5 Bxd5 21.Bxb6 Qd7 [Qxb6 22.Qxd5 Rf7 23.Qxa8+]

White wins at least a B.

Aug-23-09  gofer: 20 Bxc5

This not only attacks Rf8, but also frees up the c pawn to move forward and allow the deadly Bc4 or at least the threat of Bc4. Nxh1 isn't an option (it seems to lose very quickly to Bxb6), but Nxf1 maybe playable, but then black is already on the back foot having lost a key pawn. If black swaps off on d5 then the pawn will move to d5 and then d6 causing real problems, allowing the Nc3 to go to d5 and then e7. There are also threats of swapping off on d8.

I haven't done the analysis as I am on holiday... Oz. But its time to check...

Premium Chessgames Member
  johnlspouge: < <Athamas> wrote : [snip] 23.d6+ Only 1 move. >

You are right, of course. Toga values 23.d6+ at about +6.5 P, although my 23.Nd5 still gets about +1.4 P. After 23.d6+, Toga gives some fatal variations where the White Qd3 replaces Bc4 after Bxf7+, and the Black K takes a stroll off the plank on the K-side, hence Black's panic-stricken sacrifice of the exchange.

Aug-23-09  patzer2: <RV> Thanks for the analysis. Looks like the clear winning line is 20. Bxc5!! Nxd5 21. Nxd5! Nxh1 22.Ne7+ Kf7 23.Qb4 , practically trapping the Queen.
Aug-23-09  WhiteRook48: I got 21 Nxf6+?? Qxf6 22 Bxc5??
Aug-23-09  RandomVisitor: 20.Bxc5!! Nxd5 21. Nxd5! and now:

1: Rainer F A Knaak - Juan Fernandez, Halle 1978

click for larger view

Analysis by Rybka 3 : <19-ply>

1. (3.21): 21...Re8 22.Ne7+ Kf7 23.Qe1 Qb8 24.Qxg3 Rxe7 25.Bxe7 Kxe7 26.f4 Qc7 27.fxe5 f5 28.Qa3+ Ke8 29.Qd6 Qe7 30.e6 Qxd6 31.Rxd6 Bc8 32.c5 Be5 33.Rb6 Ke7 34.Bc4 Ra7 35.b4 Bc7

2. (3.59): 21...Bxd5 22.Bxf8 Kxf8 23.Rg1 f5 24.Qxd5 Bf6 25.Kc2 Qe8 26.Qd6+ Be7 27.Qxe5 Qa4+ 28.Kc1 Bg5+ 29.f4 Bxh6 30.Qd6+ Kf7 31.Qd5+ Kf6 32.Qf3 Nxf1 33.b3 Qe8 34.Rgxf1 Bf8 35.Rfe1 Qc8 36.Qd5 a5

3. (4.00): 21...Nxh1 22.Ne7+ Kf7 23.Qb4 Qxd1+ 24.Kxd1 Rfb8 25.Qe1 Rd8+ 26.Kc2 f5 27.Bd3 Bf6 28.Nxf5 Rxd3 29.Kxd3 gxf5 30.Qxh1 Rd8+ 31.Ke2 Ke6 32.Qe1 Rd7 33.Be3 e4 34.Qb4 exf3+ 35.gxf3 Kf7 36.Qb6 Re7

Aug-23-09  TheBish: R Knaak vs J Fernandez, 1978

White to play (20?) "Insane"

No time to work out the variations, but I'm reasonably sure the first move is 20. Bxc5!

Aug-24-09  patzer2: <RV> Thanks again for all the deep analysis of yesterday's difficult Sunday puzzle solution position. The possibilities uncovered by Rybka after 20. Bxc5!! remind me of a humorous restatement of murphy's law (if something can go wrong it will), which goes "nothing is as simple as it first appears."
Aug-25-09  LIFE Master AJ: Late post: I got as far as 24.b4, however, I had no confidence that I would win ...

It wasn't until I started analyzing with the computer that I saw some of the real reasons that this sack worked. (Like 25...Rc6; 26.BxR/f7+, KxR/f7; 27.Qd5#.)

Jul-21-19  mel gibson: Good game.
Stockfish 10 agrees with the text:

20. Bxc5

(20. Bxc5 (♗e3xc5 ♘b6xd5 ♘c3xd5 ♗b7xd5 ♗c5xf8 ♔g8xf8 ♖h1-g1 f6-f5 ♕d2xd5 ♕d8xd5 ♖d1xd5 ♗h8-f6 ♔c1-c2 e5-e4 c4-c5 ♖a8-b8 b2-b3 ♖b8-c8 b3-b4 ♖c8-b8 ♖d5-d6 ♔f8-e7 ♖d6-b6 ♖b8xb6 c5xb6 ♗f6-g5 ♗f1xa6 ♗g5xh6 a2-a4 ♗h6-e3 b6-b7 ♗e3-a7 ♖g1-d1 e4xf3 g2xf3 f5-f4 ♗a6-d3 ♔e7-d8 ♗d3-b5+ ♔d8-c7 ♖d1-d7+ ♔c7-b8 ♖d7xh7) +5.50/38 272)

score for White +5.50 depth 38.

Jul-21-19  groog: Lovely finish by Rainer.
Jul-21-19  lost in space: No chance, way to complicated for me
Jul-21-19  bubuli55: 27.Qb2 and 28.Qb6 are nasty. Very difficult to see 5 moves ahead. I guess partly because of blacks moves cant be controlled. I thought 24...Qd7 was the continuation for black.
Premium Chessgames Member
  whiteshark: Black is fit only for Knaaker's yard.
Jul-21-19  bubuli55: Going foR A Knaak Out
Premium Chessgames Member
  thegoodanarchist: Great puzzle! I might have learned something today accidentally
Premium Chessgames Member
  agb2002: Black threatens Nxh1 and Nxf1 followed by Nxc4.

These threats suggest Rh4 and Bxc5.

In the case of 20.Bxc5:

A) 20... Nxh1 21.Bxb6

A.1) 21... Qb8 22.Ne7+ Kf7 23.Qd7 looks winning (23... Qe8 24.Qxb7 Qxe7 25.Rd7).

A.2) 21... Qc8 22.Ne7+ wins decisive material.

A.3) 21... Qd7 22.Nxf6+ wins decisive material.

A.4) 21... Qd6 22.c5 Qe6 (22... Qc6 23.Ne7+) 23.Bc4 seems to win.

A.5) 21... Qe8 22.Nc7 seems to win a pawn at least.

B) 20... Nxd5 21.Nxd5

B.1) 21... Nxh1 22.Bb6 looks similar to A.

B.2) 21... Bxd5 22.cxd5 Nxh1 23.Bc4 with more than enough compensation. For example, 23... Ng3 24.d6+ Rf7 25.Bxf7+ Kxf7 26.Qd5+ Kf8 (26... Ke8 27.Qe6+ Kf8 28.d7+ Qe7 29.B(Q)xe7#) 27.d7+ wins.

C) 20... Bxd5 21.Nxd5 looks similar or transposes.

Jul-21-19  bubuli55: < bubuli55: 27.Qb2 and 28.Qb6 are nasty. Very difficult to see 5 moves ahead. I guess partly because of blacks moves cant be controlled. I thought 24...Qd7 was the continuation for black. >

Found this on previous posts.

< Jimfromprovidence: <athamas> 24...Qd7 is better because it (obviously) keeps the pawn off of the 7th rank. But it also does a couple of other things. It prevents the forced response 25...Rxc5, which opens up the b file for white's queen to attack the unguarded bishop. Position below is after 27 Qb2.

click for larger view
With the queen on d7 after black's 24th,the b file remains closed and the bishop is protected by the queen.

click for larger view
White gains about a pawn in this position. >

Thanks < Jimfromprovidence >

Jul-21-19  restless: Black could have tried 21...Nxf1 instead of 21...Nxh1, for once the white Bishop is on c4, any black defense is hard to see.

Stockfish: 1)+2.19 22.Rhxf1 Rf7 23.d6 Qd7

Jul-22-19  bubuli55: No Knaak Off
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