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Nikolai Krogius vs Raymond Keene
Hastings (1970/71), Hastings ENG, rd 2, Dec-30
King's Indian Defense: Fianchetto Variation. Classical Fianchetto (E67)  ·  1-0
ANALYSIS [x]

FEN COPIED

Annotations by Raymond Keene.      [407 more games annotated by Keene]

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sac: 33.Rxe4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Sep-01-05
Premium Chessgames Member
  ray keene: this is a beautiful game by krogius which deserves to be much better known-its a fabulous sacrifice of a whole rook-i have given some detailed comments on this game to eric schiller who is currently in london as arbiter of the recently concluded 3rd staunton memorial-when he returns to california i hope he will in put the notes-this game deserves it!!
Sep-01-05  Prisoner of Zelda: nice stuff--I thought White played badly in the opening, blocking his pieces in. Didn't Tal like to play a Knight to d5 in these positions, instead of the big pawn wedge?

gorgeous sac play, tho.

Sep-01-05  Koster: According to Krogius black is better until 29...Kh7. Instead Kf7! followed by Bf6 and Qh8 is strong, "White's position being full of weaknesses on the K-side, especially h4" (Krogius). Krogius also points out the interesting 19. g4 (instead of Rc1) and claims that f5 would then be bad because of f3, blocking the K-side. However black is still gaining space on the K-side for his pieces and very likely can open some lines there with due preparation so I'm not sure about that assessment. All this is what makes the King's Indian a hard opening to master.
Sep-02-05  Speed Zamboni Driver: Fischer played it, but lost games with it.
Sep-11-15  stacase: I would have sacrificed the Knight rather than the Rook, but what do I know?

Some digression:

The new James Bond flick is going to be released soon and I saw a preview still today of a chess game - so I copied it out, looks like this:

http://oi60.tinypic.com/167ms07.jpg

there's a ring on the board at square d7. I don't know what it's about, I guess I'll have to plunk down for a ticket to find out.

Here's the link to the promo still, don't know it it's too long to post here:

http://graphics8.nytimes.com/images...

Sep-11-15
Premium Chessgames Member
  lost in space: I havenít found the time to decide with which piece to take on e4: Rook, Knight or even Bishop. But it is always the idea to be able to play f5 to open the diagonal of the Be3, hitting the pinned Bh6 and so attack the black king.
Sep-11-15  yadasampati: In the annotations Raymond Keene suggests the following alternative for blacks reply after 33. ♖xe4 (instead of 33. ... fxe4): 33...♗d7 ! 34.♖xe7+ ♘xe7 35.♔h2 It seems that whites task is much more difficult now
Sep-11-15  Braidwood: The difficulty is to know which piece to sacrifice. I would have chosen the bishop: 33. Bxe4, fxe4 with the idea 34. f5, Ne5 (natural but may be not the best) 35. Nxe4 Qf8 followed by f6, Ng5+, Rh4. The attack seems very strong but I don't have precise analyzes.
Sep-11-15
Premium Chessgames Member
  diagonalley: i tried the bishop sac.... WRONG :-(
Sep-11-15
Premium Chessgames Member
  morfishine: Some thing will be sacrificed some where

What and Where?

*****

Sep-11-15  Rookiepawn: <diagonalley: i tried the bishop sac.... WRONG :-(>

Good, I'm not the only one...

Sep-11-15
Premium Chessgames Member
  whiteshark: How much time do we have for our research ?
Sep-11-15
Premium Chessgames Member
  gawain: I am happy enough just to have seen the basic idea for White's breakthrough. The c1-h6 diagonal has to be cleared so the dark-squared bishop can help the queen attack h6. So a piece must be given up on e4 to allow white to advance the obstructing pawn to f5.

But which piece to give up? Not the light-squared bishop because it turns out to be important in a later stage of the attack, enabling the obstructing pawn on f4 to complete its transformation into the free and ferocious pawn on f6.

A very deep combination.

Sep-11-15
Premium Chessgames Member
  Jimfromprovidence: I'm trying to see what white would do if black had refused the sacrifice and played 33...Rg7, threatening 34...Nh4, which attacks the bishop while pinning the knight.


click for larger view

Sep-11-15
Premium Chessgames Member
  kevin86: A brilliant sacrifice leads to a quick mate. Here is a rare occasion that the loser comments on the game. Very good notes, Mr. Keene!
Sep-11-15  TimothyLucasJaeger: I went with the bishop sacrifice, thinking that the knight was needed to control f5 (it's not). I didn't really consider the rook sacrifice for some reason.

I think the problem with the bishop sacrfice is that black can just play passively with 33 ♗xe4 ♖f7 and i don't see that white gets anything but the pawn.

Instead 33 ♘xe4 gains a tempo on the queen and with a check the next move, paving the way to sacrifice the dark-squared bishop on c5 in order to play d6 with a double attack:

33 ♘xe4 ♕g7 34 ♘g5+ ♔g8 35 ♗xc5 dxc5 36 d6 ♖a7 37 ♗xa8 ♖xa8 38 ♖xc5 when white's b- and d- pawns look dangerous.

Unfortunately black can sully all that with 35 ... ♖c7, pinning the bishop instead of capturing it.

Very interesting, but just too complicated for me.

Sep-11-15
Premium Chessgames Member
  thegoodanarchist: I got it! Whoo hoo, Friday is usually where things start to get fuzzy for me.
Sep-11-15
Premium Chessgames Member
  agb2002: The material is identical.

The pawn on f5 stops 33.f5. This suggests 33.Bxe4 or 33.Nxe4.

In the case of 33.Bxe4:

A) 33... fxe4 34.f5

A.1) 34... Ne5 35.Nxe4 Qf8 (or 35... Qg7) 36.Bxh6 Qxh6 37.Ng5+ Kg7 38.f6+ wins.

A.2) 34... Nf8 35.Nxe4 Rxe4 (35... Qg7 36.Bxh6 as in A.1) 36.Rxe4 + - [R+2P vs B+N] and the threats 37.Bxh6 Qxh6 38.Qf7+ Qg7 39.Rh4# and 37.Rh4 look decisive.

A.3) 34... Nh8 35.Nxe4 Rxe4 36.Rxe4 with the double threat 37.Bxh6 Qxh6 38.Re7+ and 37.Re8 with the idea 38.Bxh6 Qxh6 39.Rxh8+.

A.4) 34... Nh4 35.Rxe4 Nxf5 (35... Rxe4 36.Nxe4 seems to win decisive material) 36.Rxe7+ Qxe7 (36... Nxe7 37.Rxf6 wins) 37.Nxf5 Bxf5 38.Qxh6+ Kg8 39.Rxf5 + - [B+2P].

A.5) 34... Bxf5 35.Qxh6+ Kg8 36.Rxf5 wins a piece at least.

B) 33... Rxe4 34.Rxe4 fxe4 (else drops an exchange and a pawn) 35.Nxe4 looks similar to previous lines.

I don't think 33.Nxe4 can be better nor have time for more.

Sep-11-15
Premium Chessgames Member
  agb2002: Stockfish replies with 33... Qh4 with some advantage for Black. I saw it but don't remember why I discarded it.
Sep-11-15
Premium Chessgames Member
  patzer2: Today's Friday puzzle (33. ?) is less of a training session in Chess tactics and more of a study in difficult Chess analysis.

No doubt the game move "solution 33. Rxe4!," which I missed, is the strongest continuation.

However, it's not clear whether 33. Rxe4! forces a win or simply leads to a lasting but unclear advantage.

GM Keene notes Black can make a fight of it after 33...Bd7! to , and Fritz indicates Black can put up even more resistance with 33...Rg7! to .

Of course the real fun begins after Black's expected 33...fxe4 "show me what you got" reply.

One instructive possibility is if, instead of 35...Rxe4!, Black tries to "save the exchange" with 35...Qg7 (diagram below).


click for larger view

White steam rolls Black with 36. Bxh6 Qxh6 37. Ng5+ Kg7 38. f6+ when play might continue 38...Qxf6 (diagram below)


click for larger view

39. Qh7+ Kf8 40. Qxh8#.

Sep-11-15  garrido: Mister Rey Keene
Congratulations for you commentary play against Kroguis You are gentleman and chess master
from chile with love
Sep-11-15  BOSTER: If you have time, look at the pos. half move before POTD.

Here after white 32.Rc4 black played Qf6,moving the queen fromf8. But from f8 the bishop h6 had more protection than from f6.

I guess black had only one desire to chase white queen from "h" file playing Qh4

And now look at the POTD pos.

Black had weakness on h6, weak f5 pawn, black bishop c8 and rook a8 out of the play.

So, my opinion is instead of playing 32...Qf6 was better play 32...Rf7-strategy important square should be overprotected, and at least the rook is more flexible as blocker than the queen.

I don't think that 33.Rxe4 was <surprise> for Krogius, because as good phychologist he remembered how he played as black king's Indian vs Bronstein in 1958, where Bronstein sacr. two rooks for twso minor pieces.

Of course to have such opened long diagonal a1-h8 unprotected is not very nice for black.

But chess is the game.

Sep-11-15  The Kings Domain: Nice game. I missed the right move to this pretty complex problem as there are a few variations that would lead white to have the advantage. Poor game by Keene - he weakened his kingside and queenside by poor pawn moves, leaving the former vulnerable to an attack, which white nicely took advantage of; and his decision to move his king to the center at the end of the game nullified his chances of defending against whites advanced pawns.
Sep-12-15
Premium Chessgames Member
  CHESSTTCAMPS: I favored 33.Nxe4, but only worked through a few basic lines. Crisp finish by Krogius.
Oct-25-15  eaglewing: How about 40...Bf5 41.Rxf5 Kg7 42.b6 Kf8?
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