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Nikolai V Krogius vs Oleg L Chernikov
Russian Championship (1970), Kuybyshev URS, May-??
Russian Game: Modern Attack. Center Variation (C43)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Jun-23-07  realbrob: The first move (14.Nxf7) wasn't so difficult to guess, even though my first try was 14.Bxc4 dxc4 15.Re4 Nd7, and White's attack is pretty much over. Now after 16.Rh4 Nf6, followed by 17..Nh5.

The 2nd choice was 14.Nxf7, if Black takes with the king 14..Kxf7 15.Qxh7+, the situation looks very bad for him. In the mainline 14..Rxf7 15.Re8+ Rf8 16.Rfe1 (if one thinks of it for a moment, it's the only move that really makes sense) Nc6 17.Bxg6! and the only way to prevent mate for Black is to give up the queen as we see in the game. At first I had some doubts about a queen vs. 3 pieces endgame, but then it was clear that Black's 3 pieces were badly placed and couldn't do anything.

I tried my solution against Junior 8 and I reached the real game's position at move 21, unfortunately I'm not a GM so after that I started to take all Black's pawns with the queen and it took me 20 more moves to win... Not so difficult, anyway.

Jun-23-07  BobbyL: Sacrifice the bishop to win.

14. Nf3!!

Black has one move to save himself, but he still loses the game.

Jun-23-07  realbrob: <BobbyL> What if Black's doesn't take the sacrificed bishop? What's the win for white after 14..Nd7?
Jun-23-07  slomarko: easy puzzle. the winning move is Nf3 with the idea of jumping on g5. if black plays f6 then white simply takes with the bishop on g6.
Jun-23-07  ianD: Must admit I didn't see it!
Probably not alone.
Jun-23-07  Silverstrike: <tarek1> Very true.
Jun-23-07  chessarmenia: I got to the point where white won the queen; didnt bother thinking about it after that....
Jun-23-07  BobbyL: Realbrob, whoops, I didn't see 14. ...Nd7. That's will save the game for Black. I stand corrected. 14. Nf3 is not the perfect move.

Jun-23-07  willyfly: Okey - material is even. Black is behind in development and Black's ♕ is out in the open and completely undefended. White's ♕ ♗ ♘ and ♖e1 are in position for a mating threat. Black threatens cxd3. The thing that stands out to me is that the Black ♕ could be won outright if the ♙g7 could be somehow drawn off it's square but ♘xg7 and ♗xg7 both fail to accomplish that.

the mating plan 14 ♖e3... 15 ♖h3... 16 ♕xh7# fails because of the ♗c8 and there doesn't appear to be any way to remove it from the c8-h3 diagonal.

the ♖e1 cannot go to h4 via e4 because of the ♙d5 but that ♙ can be removed with 14 ♗xc4 dxc4 and now 15 ♖e4 threatens mate in 2. The h4 square cannot be defended without losing the ♕. Black will be mated. I think this is the solution - time to check.

-----
haha - it was a back rank puzzle all along - oh well - my record for Saturday puzzles remains unblemished

Jun-23-07  realbrob: <slomarko: easy puzzle. the winning move is Nf3 with the idea of jumping on g5. if black plays f6 then white simply takes with the bishop on g6.>

14.Nf3 Nd7 and Black is perfectly fine.

Jun-23-07  patzer2: For today's puzzle solution, 14. Nxf7!! initiates a deep demolition combination, which ends up with the White Queen and three pawns rolling over Black's hapless Rook, Bishop and Knight.
Jun-23-07  MostlyAverageJoe: <patzer2> Yeah, right. How do you roll over anything after the black refuses the knight sac and plays as described in my first post? Here's the position after 14. Nxf7 Qf6 15. Ng5 Qg7 16. Qxg7+ Kxg7 (white to move):


click for larger view

Jun-23-07  ppm: <whatthefat>,
To 14..Qd7, 15. Ne5, black could reply with 15..Qg7.
I agree 14..Qf6 is not strong for black (he would have to exchange his rook for white's knight). If white's plan here is to go a pawn up and split up black's defense (similar to yesterday's game), then I understand 14.Nxf7 is good for white, but I still think the line that black played is far from optimal.
Jun-23-07
Premium Chessgames Member
  Gilmoy: Looks like a Winawer. Even material. White leads by 3 tempi in Q-side development. Black threatens cxd3. White's Q pins g6 sideways to Black's Q.

Meta-thought: It's Sunday -- we must be bold. [A] 14.Be2 Nc6 would leave White congested. White's B has no great prospects anyways. Black can't easily defend h7 -- can White double on it with N or R? [B] 14.Bxg6 fxg6 seems to make Black's defense easier.

[C] 14.Nf3 Qf6 15.Ng5 Qg7.
[D] 14.Re3 cxd3 15.Rh3 Bxh3 oops.
[E] 14.Bxc4 dxc4 15.Re4 Qf6 (or 15..f5 16.Rh4 Qc7).
[F] 14.Nxc4 dxc4 15.Bxc4 Qf6 (Qc7? 16.Re4 g5 (Qxc4? 17.Rh4 mates) 17.Qxg5+ Kh8 18.Qf6+ Kg8 19.Re5 h6 20.Bd3 wins: Nc6 21.Rg5+! hxg5 22.Qxg5+ Kh8 23.Qh6+ Kg8 24.Qh7#).

Apparently, White must prevent Qf6. Also, his KR hasn't participated yet. Suggests:

[G] 14.f4 cxd3 15.f5 refutes Qf6 (Bxf5? 16.Rxf5 as g6 is pinned) 16.fxg6 Qg7 17.exf7+ [G1] Rxf7 18.Nxf7 [G2] Kh8 18.Ng6+ Qxg6 19.Qxf8+.

So now it's Black who has a problem in preventing 15.f5.

[H] 14..f5 (Bf5? 15.Bxf5) 15.Rf3 cxd3 16.Rh3 Qc7 17.Nxg6 (threatens Ne7+ cutting Black's Q from h7) hxg6 18.Qh8+ Kf7 19.Rh7#.

Black can't allow f5, can't recapture there, and can't seem to play f5 himself. At the least, Black has no time to take the B. It looks like White's plan of f4-f5-Rh3 outsprints Black's lazy Q-side.

<After checking solution:> I missed/rejected Nxf7 because of Qf6. I think my [G] line with Bxf5 ends up being fine for Black -- he just returns the piece and develops his Q-side.

Jun-23-07  beginner64: I have read through the Kibitzing, and have not noticed a satisfactory continuation to 14. Nxf7 Qf6.

Did I miss some post?

Jun-23-07  Fezzik: I was so proud of myself for working out the tactics from move 14-21 (they're all pretty much forced), but thought Black had slightly better than the game continuation, e.g. with 16...Nd7 instead of Nc6. If 16...Nd7, I had 17.R1e7!!

BTW, I had the transpositional sac Bxg6 before Re1 along with dzechiel.

This was a good Wednesday or Thursday puzzle. Almost everything is forced, but it's somewhat hard to work out because the line goes on for so long. Even so, this was fun!

Jun-23-07  Fezzik: Some thoughts from other kibitzers: 14...Qf6 is tantamount to resigning because 15.Ng5 threatens mate, giving White time to reposition his B on d3.

White would be a pawn and a million (ok, about 4) tempi up on Black. The books would say "and the rest is a matter of technique."

<Gilmoy> thought that today's Sunday. I love Summer Vacation (and yes, it does deserve to be capitalized)!

Jun-23-07  ounos: Missed it, but was close enough. I thought that after 16. ... Nd7 Black sufficiently reinforces f8 and Bxg6 won't work - but overlooked the killer 17. R1e7 :-/
Jun-23-07
Premium Chessgames Member
  fm avari viraf: My first thought was 14.Bxg6 but immediately rejected as Black would easily defend. So my next choice was 14.Nxf7 Rxf7 15.Re8+ Rf8 16.Rfe1 [threatening 17.R1e7 ] Nc6 is forced 17.Bxg6 hxg6 18.Rxf8+ Qxf8 19.Qxg6+ Kh8 20.Re8 Qxe8 [ not 20...Bd7 then 21.Qh6+ Kg8 22.Qxf8+ ] but I didn't analyse if Black declined the Knight.
Jun-23-07  vajeer: can black defend by
16...Bd7 instead of playing Nc6
Jun-23-07
Premium Chessgames Member
  kevin86: I missed this one. I looked for Re3 followed by Rh3. I nice combination! Black should have resigned after his queen was removed. The three passed pawns are pretty irresistable.
Jun-23-07  Crowaholic: 14. Nxf7 Rxf7 (Kxf7?? and mate in 2) 15. fxg6 hxg6 (..Qxg6?? Re8+ and mate next) 16. Re8+ Rf8 17. Rfe1 immediately stands out.

Two big questions: What's Black's best next move and how to counter it? And: Can Black choose to decline one of the two sacs?

First things first: 17. ..Nd7 protecting the rook seems to be punished with 18. R1e7 Qxe7 19. Rxe7 Rf7 20. Qxg6+ Kh8 21. Rxf7 and mate next.

Next idea is to defend e7 with another piece, the only way to do this is 17. ..Nc6. Now White has 18. Rxf8+ Qxf8 19. Qxg6+ Kh8 (..Qg7?? Re8#) 20. Re8 Qxe8 21. Qxe8+ Kg7 and White unfortunately has no checks.

Let's count material for once: White has a Q and 7 pawns, totalling 17 points. Black has R, B, N and 4 pawns, totalling 15 points. Not much of a difference, but still advantageous. OTOH, Black's king is exposed, the 3 White kingside pawns are very strong, and it seems the queen will be able to lock down the rook and bishop for a while. So basically White should win.

Better moves for Black than 17. ..Nc6? Probably not, but let's at least try Rxe8.

17 ..Rxe8 18. Rxe8+ Rxc8 and although Black is nominally a knight for two pawns up, the position of the king, rook and knight is so bad that White should win anyway.

So much for the (disclaimer: relatively) easy part. As is often the case, the toughest of questions Is acceptance of the sacs forced? Are there better defences that involve declining one offer or the other? First, what if Black doesn't take the knight? Obviously, a queen move is now necessary because the Q is en prise and a counter-threat on the white queen is not possible. Qf6 maybe? 15. Ng5 Qg7 (only way to defend against Qh7#, Re8+ to mate *and* queen capture?) 16. Qxg7+ Kxg7 17. Re7+

and now

17. ..Kf6 Rfe1 and there may be a forced mate, but in any case, 18. ..Rh8 19. Nxh7+ Rxh7 wins easily. [Correction after checking with computer: Rfe1 drops the knight, oops! Re5 threatening to fork K and R if B is taken is much better.] 17. ..Kh6 h4! and Black seems to be in a pitiable condition. 17. ..Kg8 Rxh7 18. cxd3 oops. Let's try again.
17. ..Kg8 Be2 is better and White should eventually win upon careful play. But this will not be that easy I guess.

Ok, so basically declining the knight sac seems way better for Black than accepting it.

Anyway, let's see if Black can do even better by accepting the knight but declining the bishop sac. White threatens Re8+, Qxh7+ and/or Bxf7.

15. ..Rf8?? 16. Qxh7#
15. ..Qc7 Re8+

15. ..Qd7 16. Bxf7+ Qxf7 (..Kxf7? Qxh7+ followed by Qxd7 Bxd7 and a White endgame win). 17. Qg5+

and now

17. ..Qg7 18. Re8+ Kf7 19. Re7+ game over.
17. ..Kf8 18. Qd8+ Kg7 19. Qxc8 winning
17. ..Kh8 18. Qd8+ Kg7 winning in the same way, or ..Qg8 19. Re8 winning [Ok, my computer says: Qf6+ followed by Re8#. Could've seen that one.]

15. ..Bd7?? 16. Bxf7+ Kxf7 17. Qxd6
15. ..Rg7? 16. Bxh7+ and 17. Qxd6

To recap, Black's best option is probably to refuse the knight sac and play Qd6-f6-g7 instead. But White should win the endgame upon careful play. Looking at the solution...

Seems I got this line but with a transposition: White plays Re8+ before the B sac. Does not seem to make much of a difference except possibly allowing more (winning) lines.

And Black seems to have missed the knight refusal defence, or I may have missed an easier win for White in this line.

Jun-23-07  Crowaholic: <Fezzik: Some thoughts from other kibitzers: 14...Qf6 is tantamount to resigning because 15.Ng5 threatens mate, giving White time to reposition his B on d3.>

Err, so what? After 21. Qxe8+, White was the equivalent of two pawns up, Black's king was exposed, and the kingside pawns were going to kill Black whose only hope would be a major blunder by Krogius. Still, Chernikov played on for 10 more moves. I'm sure he would have been happy to try and draw the position that results from 17. Re7+ Kg8 18. Be2 in the 14. ..Qf6 line, *if only he had found it*. Also note that saving the bishop blocks the e file for the f1 rook, and White will need another tempo to clear it, which makes at least 3 more tempi for activating this rook.

Jun-23-07  Pawsome: <Fezzik: Some thoughts from other kibitzers: 14...Qf6 is tantamount to resigning because 15.Ng5 threatens mate, giving White time to reposition his B on d3. White would be a pawn and a million (ok, about 4) tempi up on Black. The books would say "and the rest is a matter of technique."> I don't believe it's all that simple. Black can claw a few tempi back and seems to be able to defend. Things might go like this: 14. Nxf7 Qf6 15. Ng5 Qg7 16. Qxg7+ Kxg7 17. Be2 h6 18. Nf3 Nc6 19. Ne5 Nxe5 20. dxe5 Be6 21. Rd1 Rac8 22. Rd4 Rc5 23. Rb1 b6 when white is clearly on top, but winning ain't so easy.

Jun-23-07  MaxxLange: I saw the first key, and the second, but my idea was to play Rf8+, then Bxg6 and THEN double rooks. I bet that's already been refuted in the above analysis
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