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Rainer F A Knaak vs Wolfgang Uhlmann
GDR-ch (1978), Eggesin GDR, rd 14, Feb-??
Gruenfeld Defense: Exchange. Classical Variation (D86)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Given 8 times; par: 15 [what's this?]

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Kibitzer's Corner
Jul-13-19  asianwarrior: nice to see the way white prepared the attack.
Jul-24-20  sudoplatov: For once, I got one. Nxh5 is obvious, but it took a few seconds to get Bf6. Black cannot get the Queenside pieces into action before White gets the Rook activated.
Jul-24-20  stacase: Didn't take all that long to see 16.Nxh5 The rest? Not so much.
Jul-24-20  mel gibson: I saw the chosen move immediately however
Stockfish 11 chooses a different moves:

16. Qg3

(16. Qg3 (♕f3-g3 e6-e5 d4xe5 ♕d7-g4 ♕g3xg4 h5xg4 ♘f4-d5 ♗g7xe5 h4-h5 f7-f6 ♗g5-h6 ♖f8-d8 h5xg6 ♗b7xd5 e4xd5 ♗e5xc3+ ♔e1-e2 ♖d8xd5 ♗d3-c4 ♖a8-e8+ ♗h6-e3 ♘a5xc4 ♖d1xd5 ♘c4-e5 ♖h1-h7 ♘e5xg6 ♖d5-d7 f6-f5 g2-g3 ♘g6-f8 ♖d7-e7 ♘f8xh7 ♖e7xe8+ ♔g8-f7 ♖e8-a8 ♘h7-f6 ♖a8xa7+ ♔f7-e6 ♖a7-a6 ♘f6-d7 ♔e2-d3 ♗c3-a5 ♔d3-c2 ♔e6-d5 ♖a6-a8 ♘d7-f6 ♖a8-f8 ♔d5-e6 ♗e3-f4 ♘f6-e4 a2-a3 ♘e4xf2) +1.39/36 190)

score for White +1.39

It's not until Black plays 19. f6
that it becomes a disaster.
Black should have played 19. f5.

19... f6

20. Qg6+ (20. Qg6+ (♕h6-g6+ ♔g8-h8 e4-e5 ♕d8-d7 ♕g6-h6+ ♔h8-g8 ♖h1-h3 ♔g8-f7 e5xf6 ♖f8-g8 ♕h6-h7+ ♔f7xf6 ♕h7xd7 ♗b7xg2 ♖h3-e3 ♖a8-e8 d4xc5 ♗g2-c6 ♕d7-d6 ♖g8-g1+ ♔e1-e2 ♖g1-g7 ♕d6-f4+ ♔f6-e7 c5xb6 a7xb6 ♕f4-c7+ ♔e7-f8 ♕c7xb6 ♖e8-a8 ♖e3xe6 ♖g7-e7 ♕b6-c5 ♖a8-a7 ♔e2-f1 ♗c6-e8 ♖e6xe7 ♖a7xe7 ♕c5xa5 ♗e8-f7 ♕a5-d8+ ♗f7-e8 ♗d3-c4 ♖e7-f7 ♗c4xf7 ♔f8xf7) +16.92/32 47)

score for White +16.92 depth 32

Jul-24-20  Pastern1k: Best defence 17...e5 18. Rh3 Bxf6 19. Rg3+ Bg7 20. Qf6 Qg4
Jul-24-20  Chesgambit: nice attack
Jul-24-20
Premium Chessgames Member
  agb2002: Black threatens cxd4.

White can start an attack against the black king with 16.Nxh5 but after 16... gxh5 (16... cxd4 17.Nf6+ Bxf6 18.Bxf6 followed by h5 looks winning) 17.Bf6 (to stop f5 with defense along the 7th rank) 17... Bxf6 18.Qxf6 Qd8 19.Qh6 f5 Black manages to enable that defense and also the square f6 for the queen or rook, blocks the b1-h7 diagonal and has f4 to prevent Rg3 so White would probably forced to settle for perpetual with 20.Qg6+.

Another option is 16.Qg3 but after 16... Qc7 (16... cxd4 17.Nxh5 looks too risky for Black) 17.Nxh5 Qxg3 18.Nxg3 cxd4 19.cxd4 Bxd4 20.h5 the attack without queens doesn't seem to be very dangerous.

I don't know. I'd probably play 16.Nxh5 and hope to get more than a draw.

Jul-24-20
Premium Chessgames Member
  Predrag3141: <Pastern1k: Best defense 17...e5 18 Rh3 Bxf6 19 Rg3+ Bg7 20 Qf6 Qg4>

I'd be very happy with Black's rook and two pieces for a queen.

Stockfish agrees and continues 21 Rxg4 hxg4 22 Qg5 (diagram below). Some quick runs continue 22 ... Rad8, but an hour-long run suggests 22 ... c4 and ... Rae8-e6, which I prefer. The long runs and most of the quick ones give White a half-pawn edge, but I'd rather play Black.


click for larger view

Jul-24-20  Walter Glattke: 21. or 22.-Qe7 match about Elo 2400 what means , not perfect played. Options : 16.Bc2 or 16.0-0-0
Jul-24-20  Brenin: As <agb2002> suggested, 19 ... f5, and if 20 Rh3 then f4, looks like Black's best defence, leaving White with nothing much except the draw by perpetual, e.g. 20 Qxe6+ Kh7 and Black escapes the attack.
Jul-24-20  Walter Glattke: If 19.-f5, Bb7 is guarded by Na5, so 20.Rh3 Qf6!? 21.Rg3+ Kf7 22.Qh7+ Ke8 even that seems to work for black. Or 20.-f4 or 20.-Rf6, the computer plays 16.Qg3, misconfidence to the knight sac.
Jul-24-20
Premium Chessgames Member
  chrisowen: Chuffdin keyslike nh5aquak honequak ph5aquak honequak bf6aquak fonequak bf6aquak fonequak quick its a evictin 17e5 kestrels keyslike yonequak eonequak 0 1 it ok keyoquak qf6aquak fonequak qd8aquak donequak qh6aquak honequak pf6aquak fonequak bonchqua keyslike 9 10 it ok keyoquak quick its a finelikey 19f5 kestrels keyaquak fonequak aquakeyi 1 2 it ok keyoquak aquakeys chuffdin keyslike luzitjay its feintqua churchon whipmags keyslike bitzjoly its feinthon cratchet keyaquak dewplums mugszits bindjoly its feintqua nh5aquak honequak keyslike umsumums fonequak fondquak chumpqua honecone chuffdin keyslike nh5aqua honequak;
Jul-24-20
Premium Chessgames Member
  chrisowen: Fracking knight no?
Jul-24-20  TheaN: Bit of an odd Friday, considering White didn't play a winning combination but won anyway.

I actually thought <16.Nxh5 gxh5 17.Qxh5?!> would be playable but has a pesky early 17....f5! which is still just -1. Still think that looks risky, I foresaw <17....e5?!> being the only practical way to stop a White e5, after which I wanted to play <18.Rh3!?>


click for larger view

Mind that a lot of moves lose here for Black. SF gives the rather crazy line 18....f6! (balls of steel to play f6 in a position like this) 19.dxe5 Qe8 20.Qxe8 Raxe8 21.exf6 Bxf6 22.Bxf6 and we end up in an entirely different ball game:


click for larger view

Where Black will have to play Bxe4! to keep muddying the waters for a tiny plus (-0.5) instead of Rxf6 (+0.2) for a tiny deficit; a draw regardless...

16.Bf6 is better. But subjectively, not so sure.

Jul-24-20  5hrsolver: I got the first 4 moves but didnít find a convincing win. The engine here also gives white only a slight advantage.
Jul-24-20  RandomVisitor: Lc0 'sees' 17...e5 in the game line as an improvement for black, and therefore 'thinks' that lines emerging from 16.Rh3 are more favorable for white...


click for larger view

Lc0_0.26.1_384x30-t60-4485.pb:

<20/51 09:45 359k 612 +1.06 16.Rh3 cxd4 17.Rg3> Rac8 18.cxd4 Rc3 19.Nxh5 f5 20.Nxg7 fxe4 21.Qg4 exd3 22.Bd2 Qf7 23.f3 Rc6 24.Qxg6 Qxg6 25.Rxg6 Kf7 26.Rg5 Rg8 27.d5 exd5 28.Nf5 Rxg5 29.Bxg5 Ba6 30.Nd4 Rc3 31.Rc1 Rc4 32.Rxc4 dxc4 33.Bd2 Nb7 34.Nf5 Nc5 35.h5 Na4 36.Nd6+ Kg8 37.Ne4 Bb7 38.Nc3 Nc5 39.Nb5 a6 40.Nd6 Bd5

Jul-24-20
Premium Chessgames Member
  drollere: in the game, why not 21. Rh3 instead of two moves later? 21. Rh3 Qe8, 22. Qh6+ Kg8, 23. Rg3+ Kf7, 24. Rg7#
Jul-24-20
Premium Chessgames Member
  Pedro Fernandez: My somere analysis:


click for larger view

16. Nxh5 gxh5 17. Bf6 Bxf6 18. Qxf6 Qd8 19. Qh6 f6 20. Rh3 Kf7 21. Rg3 Ke7 22. e5 f5 23. Rg7+ Rf7 24. Qf6+ Kd7 25. Rxf7+ Kc6 26. Qxe6+ Qd6 27. Qxd6#


click for larger view

As always, I'll see the solution and SF analyses, later.

Jul-24-20  Brenin: <drollere>: If 21 Rh3 then Black can play Qe7 (or d7 or c7), e.g. 22 Qxh5+ Qh7, or 22 Rg3 Qh7, or 22 e5 f5, blunting the attack.
Jul-24-20  RandomVisitor: A final look at the position after 15...c5:


click for larger view

Lc0_0.26.1_384x30-t60-4485.pb:

35/96 3:15:35 7,106k 605 <+1.33 16.Rh3 cxd4 17.Rg3> Rac8 18.cxd4 Rc3 19.Nxh5 f5 20.Nxg7 fxe4 21.Qg4 exd3 22.Bd2 Qf7 23.f3 Rc6 24.Qxg6 Qxg6 25.Rxg6 Kf7 26.Rg5 Rg8 27.Nh5 Rxg5 28.hxg5 Nc4 29.Nf4 Rd6 30.g6+ Kg8 31.Nh5 e5 32.dxe5 Rxg6 33.Nf4 Rg5 34.Bc3 Nxe5 35.Kf2 Ba6

Jul-24-20  PJs Studio: Ive found these types of sac's tough to play over the board. i.e., too many moves to then prove blacks king has no flight squares. Been burned too many times.

Nice play by Knaak.

Jul-25-20
Premium Chessgames Member
  Pedro Fernandez: I'm chocked! It is the first I analyze so good a difficult problem like this. And I did it in about 10 min.!!
Jul-25-20
Premium Chessgames Member
  Pedro Fernandez: It was the bishop my great <Chris>.
Jul-25-20  RandomVisitor: In the game line 17...e5 is an improvment. The machine selects 19.Qxf6 below and avoids the queen sacrifice line, which is 19.Rg3+ Bg7 20.Qf6 Qg4! 21.Rxg4 hxg4, which I will look at in my next post.


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Lc0_0.26.1_384x30-t60-4485.pb:

<38/87 10:39:41> 28,571k 743 <+0.33 17...e5 18.Rh3 Bxf6 19.Qxf6> Kh7 20.d5 Rg8 21.Rf3 Rg6 22.Qxe5 Kg8 23.Qxh5 Qg4 24.Qxg4 Rxg4 25.g3 Re8 26.Re3 f6 27.Kd2 Kh8 28.Rf3 Kg7 29.Rf4 Bc8 30.Rg1 Rh8 31.Rxg4+ Bxg4 32.Ke3 Nb7 33.a4 Nd6 34.c4 Nf7 35.f3 Bd7 36.Ra1 a5

Jul-25-20  RandomVisitor: The 17...e5 improvement line continues 18.Rh3 Bxf6, where 19.Rg3!? leads to the queen sacrifice line, 19...Bg7 20.Qf6 Qg4! 21.Rxg4 hxg4:


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Lc0_0.26.1_384x30-t60-4485.pb:

<42/97 10:02:52> 21,248k 587 <+0.33 22.Qg5 c4 23.Bc2 Rae8 24.h5> Re6 25.d5 Rh6 26.d6 Nc6 27.Qxg4 Nd8 28.Ba4 Ne6 29.d7 Rd8 30.Rd6 Kf8 31.Bb5 Bh8 32.Bxc4 Ke7 33.Rd3 Nc5 34.Qg5+ Rf6 35.Re3 Kxd7 36.Bd5 Bxd5 37.exd5 b5 38.Qg4+ Kc7 39.Rf3 Rfd6 40.Rxf7+ Kb6 41.Ke2 Rxd5

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