chessgames.com
Members · Prefs · Laboratory · Collections · Openings · Endgames · Sacrifices · History · Search Kibitzing · Kibitzer's Café · Chessforums · Tournament Index · Players · Kibitzing
Valery A Chekhov vs Hans-Ulrich Gruenberg
Chigorin Memorial (1983), Sochi URS
Queen's Indian Defense: Riumin Variation (E16)  ·  1-0

ANALYSIS [x]

FEN COPIED

Get this game explained with Decode Chess
explore this opening
find similar games 4 more Chekhov/H Gruenberg games
sac: 18.Nd6 PGN: download | view | print Help: general | java-troubleshooting

TIP: At the top of the page we display the common English name for the opening, followed by the ECO code (e.g. "E16"). The ECO codes are links that take you to opening pages.

PGN Viewer:  What is this?
For help with this chess viewer, please see the Olga Chess Viewer Quickstart Guide.
PREMIUM MEMBERS CAN REQUEST COMPUTER ANALYSIS [more info]

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-15-13
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the bishop pair.

Black threatens 18... cxd4 and ... Qxe5.

The first idea that comes to mind is 18.Qxf7+ Qxf7 19.Nxf7 Kxf7 20.Nd6+ forking the king and the bishop on b7, but Black can play 20... Bxd6.

This suggests a transposition, starting with 18.Nd6:

A) 18... Qxd6 19.Qxf7+ Kh7 (19... Kh8 20.Qxb7 with the double threat 21.Nf7+ and 21.Qxa6) 20.Bh3

A.1) 20... Re7 21.Bf5+ Kh8 22.Ng6+ Kh7 23.Nxe7+ and mate in two.

A.2) 20... Bc8 21.Qxe8 Bxh3 22.Qxa8 + - [2R+P vs B+N].

A.3) 20... Qf6(e7,c7,etc.) 21.Bf5+ Kh8 22.Ng6+ Kh7 23.Ne7+ wins the queen or mates.

B) 18... g6 19.Qxf7+ Qxf7 20.Nexf7

B.1) 20... Re7 21.Nxb7

B.1.a) 21... Rxb7 22.Bxd5 wins the exchange and two pawns.

B.1.b) 21... Rxf7 22.Bxd5 Rb8 23.dxc5 Rbxb7 24.Bxb7 Rxb7 25.c6 Rc7 26.Rd7 and White should win the endgame.

B.1.c) 21... Kxf7 22.Bxd5+ Kf6 23.Nxc5 Rd8 24.Nxa6 + - [N+3P vs B].

B.2) 20... Reb8 21.Nxb7 looks even worse than B.1.

C) 18... Red8 19.Ndxf7 looks very bad for Black.

Mar-15-13  Abdel Irada: <<•>Barely legal<•>>

Amazing that a game of such complexity, with all but two pieces still on the board, reached no further than move 18 before White found a way to penetrate his opponent's seemingly virginal position.

All that is required to open up Black's kingside is a "quiet" incursion, which just happens to overwork the defenses offered by the black queen and expose the weakness of her consort.

<<•> 18. Nd6! ... >

Piling up on the traditional target square f7 with a vengeance. Now Black must decide how to defend it.

The most principled way to do this is to remove the invading piece.

<<•> (1) 18. ...Qxd6

19. Qxf7†, Kh7 >

Black can also try (a) 19. ...Kh8, but then White, if nothing better is available, is free to regain material with interest with 20. Qxb7, when because of the deadly threat of the royal fork 21. Nf7†, Black will have no time to save his knight on a6.

<<•> 20. Bh3! >

And what is Black to do? He can prevent 21. Bf5† only by 20. ...Bc8?, when White continues 21. Qxe8, winning the exchange and pinning the bishop; taking on h3 loses two rooks for a bishop, and Black simply isn't in a position to make good on such a sacrifice with a counterattack.

If, however, he allows 21. Bf5†, his king will come under a crushing rain of blows, and defeat will be no less inevitable.

What, then, if Black tries a different defense?

< (2) 18. ...f6
19. Nef7 ... >

This temporarily cements the menacing knight on d6 while threatening 20. Bxd5, after which White's discovered checks are a danger that cannot be countenanced.

< 19. ...Nb4 >

With this move, Black defends the d-pawn, as he might also do with 19. ...Nc7. Either way, however, it leaves White with a free hand, for the knights remain firmly planted in Black's trachea.

< 20. Qg6 >

Now White has too many threats. Short of a decisive concession of material, Black cannot prevent 21. Nxh6†, when his kingside disintegrates.

In both of these lines, I confess that there are many variations I have not catalogued. I justify this omission by lack of necessity: None of them appears to offer any real hope of defense, although Black may possibly complicate and delay the decisive consummation of White's penetration of his position.

Mar-15-13  Al2009: There was another way to win, even faster than 20. Bh3.

After 20. Qxb7 Nc7 21. dxc5! Qxe5 (22...bxc5 23. Nc4! Qd8 24. Bxd5 ) 22. cxb6 Ne6 23. bxa7 is really DEVASTATING for Black.

Mar-15-13  newzild: When I was looking at the starting position I saw 18. Nd6 but not 20. Bh3 - I only noticed it when Black played 19...Kh7, as I was clicking through the game.

No point for me.

Candidates' tonight. Yippee!

Mar-15-13
Premium Chessgames Member
  OhioChessFan: Last call! The Candidates Moves Prediction Contest, sponsored by the legendary <chessmoron> and hosted in my forum, is now open. First round begins in a few hours. Click on Elvis for details.
Mar-15-13
Premium Chessgames Member
  Dionysius1: I love the Rc3, Rf3 and Be6+ maoeuvre. Suddenly a lot of firepower is unleashed!
Mar-15-13  abuzic: 18.Nd6 Qf6 19.Qxf6 gxf6 20.Nxe8 Rxe8 21.Nc4 cxd4 22.Rxd4 dxc4 23.Bxb7 Nc5, this is playable endgame in favor of white.

18...Qxd6 19.Qxf7+ Kh7 20.Bh3

<20.Qxb7 is no better after 20...Nc7, for example: 21.dxc5 Qxe5 22.cxb6 axb6, again this is playable in favor of white; <for 22...Ne6 23.Qxd5 is stronger than 23.bxa7 Nc5>>

20...Rxe5 21.dxe5 Qxe5

<21...Qc7 22.Bf5+ Kh8 23.Qg6 Kg8 24.Rc3 Qxe5

<24...Be7? leads to forced mate with 25.Qh7+! Kf7

<(25...Kf8 26.Be6 Ke8 27.Rf3 Bd6 28.Qg8+ Ke7 29.Qxg7+ Kxe6 30.Rf6+ Kxe5 31.Qg6 and mate next with 32.f4# or 32.Qf5#)>

26.e6+ Kf6 27.Re3 Bd6 28.Qg6+ Ke7 29.Qf7+ Kd8 30.e7+ Qxe7 31.Rxe7 Bxe7 32.Rxd5+ Bxd5 33.Qxd5+ Kc7 34.Qd7+ Kb8 35.Qc8#>

25.Re3, and black has no effective defence, for example 25...Qf6 26.Qh7+ Kf7 27.Bg4 with multiple threats like Rf3, Bh5+, Be6+>

22.Qxb7 Nc7 23.e4 white stands better.

Mar-15-13  morfishine: Oh no, another 'White Queen on <f5>' puzzle; My initial assessment shows White's position is extremely strong while Black's is weak and full of holes. The polarized nature of the attributes of each side mean there's probably more than one way for White to win.

(1) <18.Nd6 Qxd6 19.Qxf7+ Kh7> Forced; If 19...Kh8??, then 20.Qxb7 threatens both 21.Nf7+ winning the Black Queen and 21.Qxa6 winning a piece;

Here, I felt best was <20.Qxb7> but Black has the stubborn <20...Nc7>

"Too many trees, Too little time"

The primary alternative for Black in Line #1 is 18...f6 declining the offer:

(1a) <18...f6> White has two replies: 19.Nxb7 & 19.Nef7

**********
PM: Very nice technique by Chekhov!

Mar-15-13  Patriot: Material is even.

18.Nd6 looks interesting.

18...Qxd6 19.Qxf7+ and 20.Qxb7

18...g6 19.Qxf7+ Qxf7 20.Nexf7

There's more to this but I don't have time this morning.

Mar-15-13  YetAnotherAmateur: I could see that 18. Nd6 was promising, because Qxd6 was met by Qxf7+ and a vicious attack to follow that was well worth the knight.

So more interesting to me were the lines where black didn't take the bait, like: 18. Nd6 Red8
19. Ndxf7 Rde8
20. Nxh6+ gxh6
21. Qg6+ and white can start mopping up material.

Mar-15-13  James D Flynn: Material is equal but White’s pieces are more aggressively placed and the Black pawn on f7 looks vulnerable. 18.Nd6 Qxd6 19.Qxf7+ Kh7 20.Qxb7 Nb4 21.a3 Rab7(not cxd4 22.f4 and the c file is open for the White R and a retreat Nc6 will lose a piece) 22.Qf7(White is after bigger game than the pawn on a7) Nc6(not Na2 R a1 simply wins a piece)23.Nxc6 Qxc6 24.Bxd5 Qc8(if Qd6 25.Qg8+ Kg6 26.Bf7+ Kf6 27.Bxe8 Rxe8 28.dxc5 Qb8 29.c6 gives White a decisive material advantage)25.Bf7+ Kf6 26.Rc3 Bd6 27.Rf3+ Ke7(not Kg5 28.Qxg7#) 28.Re3+ Kd7 29.Rxe8 Qxe8 30.Bxe8+ Rxe8 31.Qxg7+ with decisive material advantage.
Mar-15-13  linares: What about 24. ...d4, this stops R-f3
Mar-15-13  snakebyt: I thought it possible that blkQ would not exchange here (there must be some rule about that). I chose 28 Qxf7+ Kh8 29 Ng6+(forking Queen) Kh7 30 g6xQ RxN
Mar-15-13  snakebyt: <agb2002> Just read your bio. it is interesting to know now that my incorrect answers and admissions of defeat are part of a metrics smack down. ;-) Well, I guess the good stuff is counted too! Thanks!
Mar-15-13
Premium Chessgames Member
  kevin86: I was blindsided by that first move,didn't see it coming!
Mar-15-13  YouRang: <al wazir: I saw the first two moves and would have made them OTB, but then I would have played 20. Qxb7, and if 20...Nc7, then 21. e3. In the game line, after 20. Bh3 I think black does better with 20...Bc8.>

Yeah, I didn't see 20.Bh3 at all, but 20.Qxb7 looks strong enough to be a viable solution.

Mar-15-13  mdoc7: Training at chesstempo.com helps solve this problem faster than I would have a year ago. 28.Nd6

I didn't see 20.Bh3, but I would have if I was at move 20.

Mar-15-13
Premium Chessgames Member
  Jimfromprovidence: I thought that 18...g6 was a tough defense.

After 18...g6 19.Qxf7+ Qxf7 20.Nexf7, which <Patriot> annotated, here is the position.


click for larger view

If 20...Rab8, then 21 Nxb7 follows. Notice that if black plays 21...Rxb7, then 22 Nxh6+! is best.


click for larger view

If 22...Bxh6, then 23 Bxd5+ puts white up.


click for larger view

Mar-15-13
Premium Chessgames Member
  agb2002: <snakebyt: <agb2002> Just read your bio. it is interesting to know now that my incorrect answers and admissions of defeat are part of a metrics smack down. ;-) Well, I guess the good stuff is counted too! Thanks!>

Everything counts!

Mar-15-13  YouRang: Hi <JimFromProvidence> <If 20...Rab8, then 21 Nxb7 follows. Notice that if black plays 21...Rxb7, then 22 Nxh6+! is best.>

I'm not seeing why 22.Nxh6+ is best there. That seems to exchange the N for 2 pawns, whereas 22.Ne5 keeps the N, and I still win a pawn with either Nxg6 or Bxd5+.

Mar-15-13
Premium Chessgames Member
  Jimfromprovidence: <YouRang> <I'm not seeing why 22.Nxh6+ is best there. That seems to exchange the N for 2 pawns, whereas 22.Ne5 keeps the N, and I still win a pawn with either Nxg6 or Bxd5+.>

I think that 22 Nxh6+ is a tempo play. Here is the position after 21..Rxb7.


click for larger view

I agree that 22 Ne5 is perfectly fine, but 22 Nh6+ Bxh6 23 Bxd5+ forces 23...Rf7, and white can gain a tempo in this line with 24 Rc3, below (seeing 25 Ra3).


click for larger view

So 24...Rxe2 25 Bxf7+ Kxf7 26 Ra3, below


click for larger view

forces the movement of the knight and white wins the a pawn with check.

Mar-15-13  mikemill85: Why not 24. e6 with Qh7 then Qh8 then Qxg7 with mate to follow very quickly!!!
Mar-15-13  mdoc7: <JimFromProvidence>, seeing that the white's threat 23.Bxd5+ is but a few moves up, 20...Rab8 would not be made. Instead, 20...Bc6 or 20...Bfxd6 21.Nxd6 and then move the other black Bishop out of attack.

Or if we continue on, as you narrated, to 22.Nxh6+, then instead of 22...Bxh6, black does 22...Kg7 (if 22...Kh7, white can come back with Ng4 and then Nf6+ winning rook) and white's Bxd5+ threat evaporates. You have to account for that and reject this line of attack if it's gonna be seen by your opponent. I don't think he would be blind.

So now white must move the knight: 23.Ng4, while he loses tempo. 23...Rxe2 etc.

Mar-15-13  mdoc7: <mikemill85>,It's a nice try, flushes the king out of the corner, but it won't be mate if black makes the right moves.
Mar-25-22
Premium Chessgames Member
  Messiah: Really nice finish.
search thread:   
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>

NOTE: Create an account today to post replies and access other powerful features which are available only to registered users. Becoming a member is free, anonymous, and takes less than 1 minute! If you already have a username, then simply login login under your username now to join the discussion.

Please observe our posting guidelines:

  1. No obscene, racist, sexist, or profane language.
  2. No spamming, advertising, duplicate, or gibberish posts.
  3. No vitriolic or systematic personal attacks against other members.
  4. Nothing in violation of United States law.
  5. No cyberstalking or malicious posting of negative or private information (doxing/doxxing) of members.
  6. No trolling.
  7. The use of "sock puppet" accounts to circumvent disciplinary action taken by moderators, create a false impression of consensus or support, or stage conversations, is prohibited.

Please try to maintain a semblance of civility at all times.

Blow the Whistle

See something that violates our rules? Blow the whistle and inform a moderator.


NOTE: Please keep all discussion on-topic. This forum is for this specific game only. To discuss chess or this site in general, visit the Kibitzer's Café.

Messages posted by Chessgames members do not necessarily represent the views of Chessgames.com, its employees, or sponsors.
All moderator actions taken are ultimately at the sole discretion of the administration.

This game is type: CLASSICAL. Please report incorrect or missing information by submitting a correction slip to help us improve the quality of our content.

Featured in the Following Game Collections[what is this?]
18.? (March 15, 2013)
from Friday Puzzles, 2011-2017 by docjan
18.? (March 15, 2013)
from Friday Puzzles, 2011-2017 by Phony Benoni
Queen's Indian Defense: Riumin Variation (E16) 1-0 18.?
from Qk QIDs of Fredthebear by fredthebear
18. Nd6! knight fork, double attack and surprise mate threat
from Combined Operations by patzer2
Queen's Indian Defense: Riumin Variation (E16) 1-0 18.?
from - ER Other People by fredthebear
18.? (Friday, March 15)
from POTD Queens Indian by takchess
18.? (Friday, March 15)
from Puzzle of the Day 2013 by Phony Benoni
18. Nd6! knight fork, double attack and surprise mate threat
from Combined Operations by trh6upsz

Home | About | Login | Logout | F.A.Q. | Profile | Preferences | Premium Membership | Kibitzer's Café | Biographer's Bistro | New Kibitzing | Chessforums | Tournament Index | Player Directory | Notable Games | World Chess Championships | Opening Explorer | Guess the Move | Game Collections | ChessBookie Game | Chessgames Challenge | Store | Privacy Notice | Contact Us

Copyright 2001-2021, Chessgames Services LLC