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Gregory Kaidanov vs Sergey Erenburg
Aeroflot Open (2005), Moscow RUS, rd 9, Feb-23
Semi-Slav Defense: Accelerated Meran Variation (D45)  ·  0-1

ANALYSIS [x]

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sac: 23...Bf3 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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May-20-06  dbquintillion: <Confuse>: I don't think you really get credit unless you saw it to move 37.
May-20-06
Premium Chessgames Member
  al wazir: My try was 23...Nf3, which keeps up the pressure but doesn't seem to win.

But how about 23...Nxg2 ? Then 24. Kxg2 (if 24. Rd1 then Bf3, with Qh3 and Ng4 to follow) Bf3+ 25. Bxf3 exf3+ 26. Kh1 (26. Kxf3 Qg4#) Qh3 27. Rg1 Ng4 28. Rxg4 Qxg4 29. Rg1 Qh3, with the threat of Re6 and Rh6.

May-20-06  RandomVisitor: <al wazir>23...Nxg2 24.Bxg4 with slight advantage to White.
May-20-06
Premium Chessgames Member
  al wazir: <RandomVisitor>: More than slight, I think. If 24...Qxg4 then 25. Rg1, so I guess black has to play 24...Nxg4. Then 25. Kxg2 Qh6 26. Rh1, and I don't see much of an attack. So I'm 0 for 2 on this one.
May-20-06  marcwordsmith: Like RandomVisitor and Manic, I was thinking 25. . . Qh3. Yet Manic's computer deems that move inferior to Ng4 and I wonder why. My analysis is: 25. . . Qh3 26. Rg1, Ng4 27. Rxg4, Qxg4 28. Rg1, Qh3 and Black's plan is Re6, Rh6, Ng2, and mate next move. How does White stop it?
May-20-06  RandomVisitor: <marcwordsmith>White stops your line with 29.Qxc6 Re6 30.Qc8+ Bf8 31.Nbxd5
May-20-06  marcwordsmith: I think I see your point <RandomVisitor>. But what would happen after 31. . . Ra8? If 32. Qd7, Rd1.
May-20-06  percyblakeney: My "solution" began with 23. ... Bxe2 and then 24. Rxe2 Nxg2 25. Kxg2 Qg4+ 26. Kh1 Qf3+ and transferring a rook via e6 to the h-file combined with Ng4. Got here somewhere:


click for larger view

If 24. Nxe2 I tried Ng4 instead of Nxg2, but then began to suspect that my first move was wrong and checked the solution.

May-20-06  Montreal1666: a very tough and nice puzzle.
May-20-06  goldenbear: I saw this until Bxd4. I thought it came from King's Indian. I am not familiar with 7.g6, but why not 7.b6 and 8.a5, trying to exchange the light bishops?
May-20-06  goldenbear: Hmmm. I see Alekhine is playing 7.a5. How is that more refined than b6 with a5 to follow?
May-20-06  EmperorAtahualpa: I found the moves until 23...Bf3 24.gxf3 exf3 25.Bd1, but then I was thinking 25...Qh3 instead of 25...Ng4. I particularly think 25...Qh6! is brilliant

Anyway, I got part of a Saturday puzzle, so I'm more than happy. :)

May-20-06  RandomVisitor: <marcwordsmith>31...Ra8 32.Rxg5 Ng6 (or Kh8) 33.Qxa8
May-20-06  aazqua: Anything wrong with just N*g2?
May-20-06  Whitehat1963: Wow! That's all I can say about that ridiculously-long combination. Did I get it? Not on your life!
May-20-06  Manic: <aazqua> 24. Bxg4 and if Qxg4 then Rg1,if Nxg4 then Kxg2.
May-20-06
Premium Chessgames Member
  kevin86: I tried the wrong sac:the knight at g2. The bishop sac seals off the defenders of the white king and eventually causes a big advantage for black.

Not ny week;between the horrible weather and my sports teams going down,and my incompetance at the quizzes---I've been sent for a loop. Next week will be better. :)

May-20-06  dzechiel: Missed it. I was looking at 23...Nxg2.
May-20-06  goldenbear: Again, as with so many games in contemporary master play, I feel that immediately determining the position of the White king via 9.O-O? is a mistake. After all, how is White going to take advantage of Black's impotent light bishop other than by an eventual h4? It seems to me that castling to early (and often on the "wrong" side) is a major weakness of players in this computer age. Anybody care to put forth a counter-argument? I'd love to bicker about this with someone. I recommend 9.Qc2, btw.
May-20-06  c o r e: This puzzle scored the full point against me today. I go now to lick my wounds.

<goldenbear> With messy club level play, an uncastled king is just a blunder away from death, while a castled one may last through two or three such experiences. I find as my level of play has increased a lot this year, I've been seeing less and less of the 'wrong castle' phenomenon you mention. If anything can be said of computer age players, it is that they have too much information, and make many moves based on ideas or principles that may not apply to the current position- but honestly this is more true of me than of anyone I've ever played on yahoo. Is it chessgames.com fault or is it the fault of my increasingly heavy shelf of chess books? Perhaps your observation will demonstrate itself be true not just of the 'computer age player' but also of the 'printing press age player'. :)

May-20-06  LIFE Master AJ: Hmmm.

I guessed 23...Bf3! after just a few seconds. (These puzzles, you look for the wildest sack possible, especially on Friday through Sunday.) I worked it out to 26...Qh6; after just a couple of minutes. (At move twenty five, Black has both ...♘g4 and ...♕h3 as fair "Candidate Moves.")

However, to be completely certain of a Black win, you really would have had to work it out to Black's 36th move, or even beyond ...

So ... did I solve this or not?

May-20-06
Premium Chessgames Member
  Richard Taylor: I was well and truly beaten by this one!

Except I did consider the first move but not the follow up as played.

(reaches for his service revolver - dusts it off... one tear falls from his old dry mask)

Brilliant combination by Black!

May-20-06
Premium Chessgames Member
  Richard Taylor: <LifeMaster> I think if you got to Qh6 that was pretty good - you were well on the way.
May-28-06
Premium Chessgames Member
  patzer2: For the recent May 20th puzzle solution, Black's demolition of pawn structure combination 23...Bf3!! initiates a decisive attack on the White monarch.

I agree with <EmperorAtahualpa> that the followup 25...Qh3! also wins. One interesting possibility is 25...Qh3! 26. Rg1 Ng2 27. Bxf3 Nxe1 28. Bg2? (better but still losing is 28. Be2) when Black has a mate-in-two (diagram below)


click for larger view

[Black mates in two after 28...Ng4! in the above position].

White can try to complicate in the game continuation with 26. e4!? or 26. Ncxd5!? However, Black still wins with precise play after 26...Qh6! as in the game continuation.

Jun-15-06  goldenbear: <core> I don't see the merit in closing the queenside with c5 (in the hopes of winning the battle of maneuvering) and then giving your opponent a clear plan with 9.0-0. In fact, there is no point in that. Black has far better possibilities on the kingside due to White relieving the central tension.
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