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Very Hot Topic (More than 25 Replies) Kozul on the Kozul: "The Richter Rauzer Reborn" (Read 34193 times)
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #49 - 06/13/21 at 18:47:53
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FreeRepublic wrote on 06/12/21 at 16:37:05:
Perhaps the key to understanding the position after 23Bxa6 is to realize that white is playing pretty much the benefit of his knight.


Correction:
white is playing pretty much without the benefit of his knight. [/quote]
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #48 - 06/13/21 at 17:33:08
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For black to exchange queens is a well known device in the Richter-Rauzer. In the typical situation, Black has the two bishops and his doubled f pawns (semi-open g file) are acceptable in an endgame.

However, trading queens when one or two pawns down is a different matter.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #47 - 06/13/21 at 00:30:51
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In the positionally similar Botvinnik Variation 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 h6 8.Bxf6 gxf6 Botvinnik wrote trading queens is a basic objective for black.

See Suetin - Botvinnik, 20th USSR ch 1952 in Botvinnik (1996) Half a Century of Chess, game 63, pages 177-180.
https://www.chessgames.com/perl/chessgame?gid=1032267
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #46 - 06/12/21 at 16:37:05
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Sometimes an opening makes a modest request upon the reader:  Become a better chess player!

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f4 b5, start of the Kozul ("suicide") variation, 10. Bf6 gf6 11. Kb1 Qb6 12. Nce2, one of many alternatives, 12...Rc8!? 13. f5 Nd4 14. Nd4 e5 15. Ne2 b4 16. Ng3 h5 17. h4 Ke7 18. Bd3 Bh6! 19. Qe2
Kozul writes "And now the simplest way is to force the exchange of queens." Exchanging queens is not obvious when one is a pawn down and can foresee the loss of a second pawn.

19...Qe3 20. Nh5 Bc6 21. Rhe1 Qe2 22. Re2 Rcd8 23. g4 d5 = "and we can see that black has fully equalized, Vetter, G (2377 - ) - Stull, N (2618) ICCF 2006," Kozul. Credit goes to the players and to GM Kozul.

But what if white plays 23Bxa6? Black has two bishops and a well placed king, but white is two pawns up. Do I want to play this as black?

23. Ba6 d5 24. ed5 Bd5. Black threatens 25...Bxa2ch, and even ...Bxg2 (back rank). 25. Bd3 Rhg8! White cannot stop black from picking up one pawn. For example 26. g3 is demolished by 26...Bf3. 26. Rg1 faces the same move, 26...Bf3. Stockfish makes no effort to save the pawn and plays 26. R(e)e1. It evaluates the position as winning for black after either capture on g2. I will leave this as an exercise for the reader, including myself on another day.

Perhaps the key to understanding the position after 23Bxa6 is to realize that white is playing pretty much the benefit of his knight.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #45 - 02/11/21 at 18:25:57
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I went ahead and bought Kozul's book. I followed a line from IM Kanmazalp's book. Both books are great if you want to play this line as black.

They both include discussion of the game Gleichmann,M (2550)-Laghetti,G (2457) ICCF email 2015 and find it game satisfactory for black.

1. e4 c5 2. Nf3 d6 3. d4 cd4 4. Nd4 Nf6 5. Nc3 Nc6 6. Bg5! Bd7!? 7. Qd2! a6 8. O-O-O e6 9. f3!? Nd4! 10. Qd4 Be7!? 11. Kb1 b5 12. g4. Here Kozul provides one of his games with 12...Qc7. I will have to look at this as it looks safer than the game continuation:

12. ... O-O 13. Be3 Bc6 14. h4 Nd7 15. h5 h6 16. Qd2. Both Kanmazalp and Kozul continue with the game move 16...Rc8. GM Roiz of ChessPublishing, referring to this game, says "White's attacking prospects were clearly better."

Black can diverge with 16... Ne5!? 17. Qg2 Bf6 18. f4 Nc4 19. Bc4 bc4 20. Bd4 Rb8 21. Bf6 Qf6 22. Qg3 Qe7 23. g5 hg5 24. fg5 Qb7. Black has equal chances. Play might continue 25. b3 cb3 26. ab3 Be4 27. Ne4 Qe4 28. g6 a5. It this isn't a Sicilian position, I don't know what is.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #44 - 02/11/21 at 13:18:16
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MNb wrote on 02/11/21 at 06:47:18:
I feel that Bd7 is misplaced after the knights exchange


I have somewhat the same impression.

That is one reason why I was drawn to an early ...Bc6. "an ordinary chessplayer" correctly pointed out a mistaken evaluation on my part, and I'm no longer so enthusiastic.

In the 9f3 Be7 Kozul mainline, black often plays ...Rc8. White may play N(d4)xc6. Black can choose between three recaptures, each of which blocks a piece!

Instead black may prefer to initiate the trade of knights with ...Nxd4. The bishop on d7 observes the queen side and can later go to c6. That's my retrospective reasoning to justify the recommendation of two authors. Now to give it a try!
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #43 - 02/11/21 at 06:47:18
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Peculiar - my database contains 23 games and White scores 65%, due to 13 wins. Four of them are corr. games. This confirms that stats don't mean much with so few games.

That said I feel that Bd7 is misplaced after the knights exchange. And that's why I'd prefer 7...Be7 8.O-O-O Nxd4 9.Qxd4 a6, As this is off topic I won't mention the one big problem line.
  

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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #42 - 02/10/21 at 23:46:06
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FreeRepublic wrote on 02/10/21 at 19:00:56:
I found only 17 games after 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f3 Nxd4!? 10. Qxd4 Be7 11g4. Black scores 50%.


To put that in perspective, 2,766 games reached the position with 9. f3, with a score of 55%. Restricting the search to players rated 2300 and above yields 1,392 games with a score of 56%.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #41 - 02/10/21 at 19:00:56
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After 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7, both GM Kozul and IM Kanmazalp devote many more chapters to 9. f4 than to 9. f3. I think the reason is that 9. f4 has been around longer and also lends itself to more concrete analysis.

After 9 f3, both books discuss the relatively recent 9. ... Nxd4!? 10. Qxd4 Be7. This scores very well for black - 46%! Playing this may not be so easy as the stats indicate. White's plan is simple, a pawn storm on the king side. Black may have to choose judiciously between playing on the queen side, king side, or center.

I have Kanmazalp's book and he now covers 11.h4, 11g4, and 11. Kb1. White can easily combine these moves, so there are many possible transpositions.

I played through his analysis of 11h4 with a computer and found the engine to be almost worthless. The line in question is a mutual pawn storm and the engine simply can not make out the strength of attack until it's almost over. I'll just say you get everything you hoped for in a Sicilian.

I got bogged down looking at 11g4 because black must consider Be3 g5 by white. So where to put the knight? Kanmazalp opts for h5. If black plays ...Bc6, then ...Nd7 becomes possible. ...0-0 makes ...Ne8 possible.

I found only 17 games after 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f3 Nxd4!? 10. Qxd4 Be7 11g4. Black scores 50%. Tal played white in the first two games (a win and a draw).

After 11g4, several moves have been tried:  ...b5, ...Bc6, ...h6, ...h5, ...Qa5, and ...Qc7. At this point, I don't think I can trust game results or computer analysis, without digging deeper.

After 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5! e6 7. Qd2 a6 8.O-O-O Bd7 9. f3 Nxd4!? 10. Qxd4 Be7 11. g4, Kanmazalp continues ...b5 12. Be3 O-O 13. g5 Nh5 with further analysis of  14Qd2 and 14h4. 14f4 is also possible.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #40 - 02/10/21 at 18:11:41
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Sorry, I neglected to provide attribution. I was agreeing with your comment.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #39 - 02/10/21 at 16:11:54
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Sometimes at a dinner party, you'll hear someone chatting with their neighbor. Then a short while later you'll hear someone further down the table saying the same thing. Funny when that happens. Smiley
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #38 - 02/10/21 at 14:06:59
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After 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f3!? Nd4 10. Qd4 Bc6 11. h4 h6 12. Be3 d5 13. e5 Nd7 14. f4, we get a pawn structure that is common in the Classical French. Initially engines think Black is equal, but that is deceptive.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #37 - 02/09/21 at 22:30:27
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1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7 9.f3 Nxd4 10.Qxd4 Bc6 11.h4 h6 12.Be3 d5

I don't know about 12...d5, after 13.e5 Nd7 14.f4 followed by Kb1, Qd2, Bd3, Ne2-d4, etc. At first the foolish engine thinks it's equal, but that's not the case at all.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #36 - 02/09/21 at 19:31:52
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1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 has been covered by many sources. 9. f4 b5!? is a sharp main line. 9. f3 is a slower, but equally dangerous main line.

9. f3 Be7 has been played and analyzed many times. Kozul  offers 9...h6 which tends to transpose to other lines.

Both Kozul and IM Kanmalzup (ModernChess) analyze the relatively new 9...Nxd4 10. Qxd4 Be7. I think black's goal is to play ...b5 as soon as possible, taking time out occasionally for defense.

9. f3 Nxd4 10. Qxd4 Bc6 has been played a few times with good results. I came up with this independently. The idea is to play ...d5.

Here's an example of what black is looking for: 9. f3 Nd4 10. Qd4 Bc6!? 11. h4 h6 12. Be3 d5 13. ed5 Nd5 14. Nd5 Qd5 15. Qd5 Bd5 and the game is equal.

Instead, white can go for the crush with 11. e5!?. Then 11...de5! 12. Qe5 Nd7! 13. Qg3 looks forced. Now 13... Qb6! seems best. Here is a sample line: 14. Bd3 h6 15. Bf4 Nf6 16. Be5 Nh5 17. Qe1 O-O-O 18. Be4 Be7 and black is OK.

Black really can't go for the dynamic 9. f4 b5 lines unless he has a satisfactory way to answer 9. f3. Here, 9. f3 Nxd4 10. Qxd4 Bc6!? may be black's most solid, if least dynamic, solution.
  
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Re: Kozul on the Kozul: "The Richter Rauzer Reborn"
Reply #35 - 09/26/20 at 15:56:31
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GM Yermolinsky looks at the Kozul variation in his three part (and counting) video series on the Internet Chess Club.

A search of the ICC videos shows a Game of the Month on the 9f3 variation. It is Kurnosov-Dubov, annotated by Joel Benjamin. It continues with the obvious 9...b5. That may not be the best move, but the game itself is very good.
  
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