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Semen I Dvoirys vs Alexander Khalifman
Russia (ch) (1997), ?
Sicilian Defense: Richter-Rauzer. Classical Variation (B65)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Jul-05-15  RandomVisitor: After 20...Nxf4:


click for larger view

Rybka 4.1 x64:

<[+1.11] d=21 21.Nd5 exd5 22.Rh1 Nh5 23.gxh5 Kg7> 24.Qf4 Rh8 25.exd5 Bd7 26.hxg6 fxg6 27.Rhe1 Bxg5 28.Qxg5 Rdf8 29.Re7+ Rf7 30.Rf1 Bf5 31.Rfe1 Rhf8 32.a3 b5 33.Rh1 Rxe7 34.Qxe7+ Rf7 35.Qh4 Rf8 36.Qh7+

Jul-05-15  RandomVisitor: <piltdown man>The Russian Семён better translates to Semion, or a variation of Simon.
Jul-05-15
Premium Chessgames Member
  devere: The key to the position after 20 moves is that the natural looking 21. Rh1 loses to 21... Qe5, and 21. Qxf4 regaining the piece leaves White with a probably losing position. So 21.Nd5! blocking the Black Queen from defense is a "no choice" speculation that happens to be sound. There would not be much need to calculate it out over the board, because the alternatives are all so bad.
Jul-05-15
Premium Chessgames Member
  piltdown man: I think it's better spelt "Simon" then. Don't you?
Jul-05-15  RandomVisitor: <piltdown man>I know very little Russian, but they have have a different alphabet that does not translate letter for letter. Maybe one of our Russian experts here can explain better. There are several ways to do the translation, one is letter-for-letter, another is to adopt a "corrected" version that "looks good" in English, such as Boris Spassky, "Спа́сский" S-P-A-S-S-K-I-I, literally.
Jul-05-15  Prudov: <RandomVisitor> Semen is a correct transliteration (CEMEH in Cyrillic capitals), but not the only one. However, the e's are not both pronounced in the same way in this case. The name is actually pronounced Simyon with the stress on the second syllable. Simon is its equivalent in English. I am Dutch, but I am familiar with the Russian language.
Jul-05-15
Premium Chessgames Member
  agb2002: White has one bishop less.

Black threatens 21... Bxg5.

The prosaic 21.Qxf4 is met with 21... Qxg5 and it is unclear whether White has compensation for the pawn and the bishop pair.

A more interesting alternative is 21.Rh1 Nh5 (21... Bf6 22.gxf6 Nh5 23.gxh5 loses a piece at least) 22.gxh5:

A) 22... Bxg5 23.hxg6

A.1) 23... fxg6 24.Qh8+ Kf7 25.Rh7#.

A.2) 23... Qe5 24.Qh7+ Kf8 25.Qxf7#.

A.3) 23... Kf8 24.Qh7 Rd7 (24... Qf2 25.Rdf1 wins; 24... Re7 25.Qh8#) 25.g7+ Ke7 26.g8=Q wins.

B) 22... Qxg5 23.hxg6 looks similar to A.

C) 22... Qe5 23.hxg6 Qg7 24.gxf7+ Kxf7 (24... Qxf7 25.Qh8#) 25.Rdf1+ Kg8 26.Bxe6+ Qf7 27.Qh8#.

That's all I can do today.

Jul-05-15
Premium Chessgames Member
  agb2002: 21.Rh1 loses to 21... Qe5, which I saw one move later but for some reason missed after 21.Rh1.
Jul-05-15  morfishine: Really insane is <21.Rd5> and Black loses after 21...exd5 22.Rh1 Nh5 23.gxh5 dxe4 24.hxg6; but Black survives after 23...Bxg5

*****

Jul-05-15  gofer: The open h file is black's death march. White just needs to stop Qc5 from getting to the a1-h8 diagonal. If white can do this then black's days are numbers. The immediate Rh1 fails to Qe5, so first we need to block the queen's path to e5...

<21 Bd5! ...>

21 ... Bxg5
22 Rh1 Bf6
23 g5

21 ... exd5
22 Rh1 Nh5
23 gxh5 Kg7 (Bxg5 24 hxg6 Kf8 25 gxf7 )
24 exd5 Bd7
25 Ne4! Qc4/Qb4
26 Nf6

21 ... Bxd5
22 exd5

21 ... Nxd5
22 exd5

~~~

Hmmm, I preferred <21 Bd5> to <21 Nd5> as the knight seems to be a better attacking force, whereas Bb3 is very remote from the action (even at the end of the line played!)

Is <21 Nd5> drastically better than <21 Bd5>?

What do our silicon friends say???

Jul-05-15
Premium Chessgames Member
  patzer2: <RV> Rybka's improvement 24. Qf4 (instead of <24. exd5>) transposes back to the game continuation after 24.Qf4 Rh8 25.exd5 Bd7 26.hxg6 (diagram below)


click for larger view

when the game move <26...f5?>, allowing <27. Rh6> (+2.47 @ 23 depth, Deep Fritz 14), proves to be Black's decisive error.

Instead of <26...f5?>, the improvement 26...fxg6 (+1.01 @ 25 depth, Deep Fritz 14) yields a difficult, unclear position with practical OTB drawing chances.

Of course the main point of today's Sunday puzzle, as <devere> observes, is 21. Nd5!! is a "no choice" move because the alternatives lose. For example if 21. Qxf4, Black wins after 21... Bxg5 22. Qf3 b5 23. Rh1 Qe5 24. Qh3 a5 25. a3 b4 26. axb4 axb4 27. Rdf1 Bf6 (-2.41 @ 21 depth, Deep Fritz 14).

P.S.: Thanks for pointing out the improvement 18...Bf6! to save Black's game.

Jul-05-15  wooden nickel: It's easy to spot the move 21.Rh1 with mate threat on the open h-file, but then there's 21... Qe5 to the rescue and it fails. What about blocking the queen first? Now there's a choice between 3 moves. 21.Rd5 Nxd5 22.exd5 exd5 23.Rh1 and Qd4 to the rescue and fails again!


click for larger view

21.Bd5 might allow 21... Bxg5 and Black has a flight square over f8 to e7 in case of queen checks! The text move 21.Nd5 seems to work indeed, however could lead to


click for larger view

after 21.Nd5 exd5 22. h1 Nh5 23.gxh5 Kg7 24.exd5 Bd7 25.hxg6 Rh8 26.Qf4 fxg6 and then what?

Jul-05-15  RandomVisitor: After 20...Nxf4:


click for larger view

Rybka 4.1 x64:

<[+1.24] d=25 21.Nd5> exd5 22.Rh1 Nh5 23.gxh5 Kg7 24.Qf4 Rh8 25.exd5 Bd7 26.hxg6 fxg6 27.Rhe1 Bxg5 28.Qxg5 Rdf8 29.Re7+ Rf7 30.Rf1 Bf5 31.Rfe1 Rhf8 32.a3 Rxe7 33.Qxe7+ Rf7 34.Qh4 Rf8 35.Re7+ Rf7 36.Re8

Jul-05-15
Premium Chessgames Member
  patzer2: <gofer><Is <21 Nd5> drastically better than <21 Bd5>? What do our silicon friends say???>

Fritz indicates 21. Bd5?? is much worse than 21. Nd5!! to :

Semen I Dvoirys - Alexander Khalifman, Russia (ch) 1997


click for larger view

Analysis by Deep Fritz 14 x64 @ 24 depth:

1. (-5.53): 22.Bxc6 bxc6 23.Rh1 Kg7 24.Qh7+ Kf8 25.e5 Qxe5 26.Rde1 Qg7 27.Ne4 Be7 28.Qh2 g5 29.Qf2 d5 30.Nc5 Bf6 31.Nb7 Rb8 32.Qc5+ Re7

2. (-5.53): 22.Rh1 Kg7 23.Qh7+ Kf8 24.Bxc6 bxc6 25.e5 Qxe5 26.Rde1 Qg7 27.Ne4 Be7 28.Qh2 g5 29.Qf2 d5 30.Nc5 Bf6 31.Nb7 Rb8 32.Qc5+ Re7

3. (-6.69): 22.Bb3 Kg7 23.Na4 Qe5 24.Qg1 Rh8 25.Nc3 Qc5 26.Ba4 Bxa4 27.Nxa4 Qxg1 28.Rxg1 Rh2 29.Rgf1 Ng2 30.c4 Ne3

4. (-8.32): 22.Bxe6 fxe6 23.Rf1 Qe5 24.Rh1 Kg7 25.Qh7+ Kf6 26.Qh2 Rh8 27.Qf2 Qc5 28.Qd2 Kg7 29.Ka1 Rxh1 30.Rxh1 Rh8 31.Rf1 Rh4 32.Qd1 Rh2 33.a3 Qe5 34.Re1 a6 35.Rf1 b5 36.Re1 Bd8 37.Rf1

Jul-05-15
Premium Chessgames Member
  patzer2: <wooden nickle><after 21.Nd5 exd5 22. h1 Nh5 23.gxh5 Kg7 24.exd5 Bd7 25.hxg6 Rh8 26.Qf4 fxg6 and then what?> Then you try to improve and find a win in <Random Visitor>'s last posted Rybka analysis for 21. Nd4 (@ 25 depth) which includes your improvement 26...fxg6 in place of <26...f5?>

Deep Fritz 14 @ 25 depth duplicates <RV>'s Rybka analysis of best play as 21.Nd5 exd5 22.Rh1 Nh5 23.gxh5 Kg7 24.Qf4 Rh8 25.exd5 Bd7 26.hxg6 fxg6 27.Rhe1 Bxg5 28.Qxg5 Rdf8 29.Re7+ Rf7 30.Rf1 Bf5 31.Rfe1 Rhf8 32.a3 Rxe7 33.Qxe7+ Rf7 34.Qh4 Rf8 35.Re7+ Rf7 36.Re8 (diagram below)


click for larger view

Here 36...Rf8 is forced as others lose. Good luck on finding a forced win from there.

P.S.: I've been trying with Deep Fritz 14, but haven't yet cracked this difficult Black fortress.

Jul-05-15  mel gibson: After playing the winning move in DR4 64 bit
on an i7 quad core at 7 seconds per move
it took till move 150 for white to win.
It is really a draw.
Jul-05-15
Premium Chessgames Member
  patzer2: <gofer> In my reply to your post about 21. Bd5??, I forgot to include the obvious 21...Bxg5! as the refutation.

The diagram and Fritz analysis in that post is after 21. Bd5?? Bxg5! .

Jul-05-15  Shoukhath007: good puzzle with detailed analysis.
https://m.youtube.com/watch?v=l8Lug... bye
Jul-05-15
Premium Chessgames Member
  scormus: <Chrisowen> I couldnt follow all the details of your analysis, but I think you mean "Against the Sicilian, when in doubt put something on d5!"
Jul-05-15  jvv: Another interesting game between these two:
Dvoirys vs Khalifman, 1988
Jul-05-15  Lighthorse: <RandomVisitor:> <piltdown man><The Russian Семён better translates to Semion, or a variation of Simon.>

Yes, if I remember my old high school Russian classes, then Семён would be pronounced like Seem-yawn (only with shorter ee and yawn closer to yo). 'Seem-yawn' sounds very close to 'Simon.'

Of course, these days, my Russian is as abysmal as my chess. I had no clue to the solution to today's puzzle other than opening the h-file.

Jul-06-15  stst: quick but maybe erreneous, dont understand what / why 21.Rh1 followed by Qh7/8# could be blocked?

Too easy? or just missing something BIG??

Jul-06-15  jvv: 21.Rh1 Qe5
Jul-06-15  CHESSTTCAMPS: I found the key line (game line up to 23... Kg7), but couldn't sort it out from there.
Jul-08-15  Abdel Irada: I can't say I found the solution (although to look at the posts, it's not clear that anyone else found all of it either), but certain things are immediately apparent.

1) 21. Qxf4, Qxg5 ( ) is as good as giving up. White's attack is at a standstill, and Black remains a pawn up with the two bishops.

2) Rh1, Qe5 leads nowhere.

This means we need an interference move, and as so often against the Sicilian, it will probably be 21. Nd5.

This, however, is not so simple either. For one thing, it is not entirely forcing, and that means one has to calculate what happens after 21. ...Bxg5 along with 21. ...exd5 and 21. Bxd5.

I briefly considered 21. Rd5 as more forcing, but after 21. ...exd5 22. Rh1, Black now has 22. ...Qd4 and the attack collapses.

This means the text move is actually more or less forced, and after that it's all a matter of seeing what you can find after each of the replies.

Fortunately, White is no simple Semyon, and had obviously taken all of this into account when he played for this position, and it's therefore not surprising that there really is a winning continuation to find, provided that you are more patient than I was and take the time to calculate your way through the web of variations.

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