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Alexander Areshchenko vs Fidel Corrales Jimenez
World Cup (2009), Khanty-Mansiysk RUS, rd 1, Nov-21
Sicilian Defense: Dragon Variation. Yugoslav Attack (B77)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 31.Rxg7+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Nov-27-09
Premium Chessgames Member
  DarthStapler: I at least considered the first move but chose Nf5+ instead
Nov-27-09  CHESSTTCAMPS: A little too breezy in my notes for my line E, the game continuation.

<Patriot: <agb2002> <snip>...with that kind of board vision, you must have a high FIDE rating? If you don't play tournament chess, you SHOULD! You would do very well....>

I've said that for a while...

Nov-27-09  VincentL: I tried 33. Nf5+ and after long analysis (which I won't write up here) I realised that it is not decisive in some lines.

I considered 33. Ne6+ but did not see a way through to the end in all lines.

In the game, I am looking at the possible defence 36.... Qe6.

Does this hold for black?

I am out of time now, but will check later in the day.

Nov-27-09
Premium Chessgames Member
  agb2002: <Patriot: <agb2002>

I have to give you a lot of credit.>

Thank you!

<You examined the two strongest candidates in great detail (Ne6+ and fxg4) in determining which is best, although you chose the wrong move in the end.>

I strive for accuracy. It must be some kind of professional bias...

<But with that kind of board vision, you must have a high FIDE rating?>

I don't.

<If you don't play tournament chess, you SHOULD! You would do very well.>

I play occasionally in local rapid chess tournaments and have mixed results because I'm rather reluctant to study opening theory. The usual result is a disasterous time management.

<I'm usually playing 30 minute or 45 minute chess with a 5 second delay, so I try to hone my thought process for those time controls. In that case there's no time to figure out everything OTB, but your approach would do me a lot of good from time to time to help me develop better board vision.>

What I can say is that the habit of calculating deeply often permits to see long, complex lines very quickly. Another thing is that these lines are correct...

Nov-27-09
Premium Chessgames Member
  doubledrooks: I went with 33. Ne6+ and found wins in various lines, but bogged down searching for a win after 33...Kg6. As <David2009> noted, 36...Qa3 as played was a blunder, while 36...Kf7 instead leaves the position in doubt.
Nov-27-09  WhiteRook48: I thought it was 33 Rxg4+
Nov-27-09
Premium Chessgames Member
  Jimfromprovidence: This is bit off-topic, but was the move 28 Qf4 aimed to get the queen access to b3, because I don't really understand the move?


click for larger view

The funny thing is, the queen never moved again.

Nov-27-09
Premium Chessgames Member
  Eyal: <Jimfromprovidence> 28.Qf4 prepares the tactics of 30.Bg7 - for example, after the sequence <...Bxg7 Rxg7+ Kxg7 Rg1+> Black cannot play Kh7 because of Qxf7+.
Nov-27-09
Premium Chessgames Member
  Jimfromprovidence: <Eyal> <28.Qf4 prepares the tactics of 30.Bg7 - for example, after the sequence <...Bxg7 Rxg7+ Kxg7 Rg1+> Black cannot play Kh7 because of Qxf7+.>

Thanks. That makes sense.

Since that move spends a tempo, it looks like black did miss a chance to make some hay by not playing either of his rooks to the a file on move 29. You suggested 29...Ra8 but 29...Ra5 might work too.


click for larger view

Now white has to be careful, because with black's queen still on b6 the queen retains access to g1, making the winning text combination unworkable.

Nov-27-09  TheaN: Friday 27 November 2009

<33.?>

Target: 6:00;000
Taken: 9:55;314

Material: Black up, ♖}(!) + ♗ / ♘

Candidates: Rxg4 or Nf5... <[Nf5]>

-ML-
The position is simple: White is attacking, the d8-Rook down and has to win, fast. With the counterattacking mate threat of Qa3, two moves come to mind which are forcing enough: the taking-out-the-defender Rxg4, but in truth, the Black Bishop is actually a weak piece, so, it has to be:

<33.Nf5> not a weird move. The Bishop is pinned, so either the King moves which is complete suicide, or the Rook captures.

/A\
<33....Kg6 34.Qh6 1-0>

<33....Kh7/Kh8/Kf8 34.Qh6 Kg8 35.Qg7 1-0>

All fairly simple. Kf6 is slightly more tricky. So I'll first be looking at Rxf5:

/B\
<33....Rxf5 34.exf5> not much of a choice for a win, after 34.Qxf5 Qa3 35.Rxg4 hxg4 36.Qg5= will only lead to perpetual.

<34....Qa3 35.Qc1 > weird. Just moments ago White was down a Rook, and how he'll win it back completely due to the pin on the Bishop. With or without a Queen trade, White has the better endgame.

/C\
<33....Kf6> problem is, I ain't seeing this one. And I hate that... I'm seeing:

<34.Qh6 Ke5> without mate and probably a win for Black, and 34.Nxd6 is too tricky. I'm checking this one, with probably the only right way to safe the game OTB :).

Nov-27-09  TheaN: 4/5

Bleh. I guess that after my move, Black will get out effectively. Ne6 seems so weird but it opens up the f-file instead of allowing the Rook capture.

Nov-27-09
Premium Chessgames Member
  Once: <Jimfromprovidence> 28. Qf4 not only sets up tactics against f7, it also "unpins" the Nd4 along the a7-g1 diagonal. Imagine the Rc5 moving (say to s5), then the Nd4 is pinned against the Qe3.
Nov-27-09
Premium Chessgames Member
  Eyal: <Jimfromprovidence: Since that move spends a tempo, it looks like black did miss a chance to make some hay by not playing either of his rooks to the a file on move 29. You suggested 29...Ra8 but 29...Ra5 might work too.>

Yes, although the tactical reason is a bit obscure - it actually has to do with clearing the a7-g1 diagonal for the queen in the line [29...Ra5] 30.Bg7 Bxg7 31.Qxf7 Rg8 32.Nf5 Bxf5 33.Qxh5+ (here White should force the draw by 33.Rxg7+ Rxg7 34.Qxh5+ Kg8 35.Qe8+ etc.) 33...Bh6 34.Qf7+ Rg7 35.Rxg7+ Bxg7 - and now, with the black rook on c5 White would have the winning 36.Rg1...

Btw, in the actual game this idea wouldn't work for White because of 30.Bg7 Bxg7 31.Qxf7 Rg8 32.Nf5 Rxf5! 33.exf5 Be8 34.Rxg7+ (34.Qxe7, which would win in case of 29...Ra5, loses of course to 34...Qa3) Rxg7 35.Qxe8 Qa3 and here, because of the mate threat, White has to force the draw by perpetual with 36.Qxh5+ etc.

But as I also mentioned, better than both Ra5 or Ra8 which seem to lead to a draw is <29...Bg4!!> which actually wins for Black.

Nov-27-09
Premium Chessgames Member
  Eyal: PS In the line 29...Ra5 30.Bg7 Bxg7 31.Qxf7 Rg8 32.Nf5 Bxf5 there's actually another nice tactical point that involves both the a7-g1 diagonal and the a-file: if White plays 33.exf5, Black has the saving move 33...Qe3! and now 34.Qxh5+ is countered by 34...Qh6 and 34.Rg5 by 34...Qxg5! 35.hxg5 Rga8; so White would again have to settle for a draw by perpetual with 34.Rg2/g3 Kh8 35.Rdg1 Qh6 36.Rxg7 (36.Rg6?? Rga8!) Rxg7 37.Qe8+ Kh7 38.Rxg7+ Qxg7 (38...Kxg7? 39.Qxe7+ followed by Qd8+ and Qxa5) 39.Qxh5+ etc. And of course the 31.Rxg7+ idea played in the game wouldn't work either, because it requires the presence of an unmolested rook on g1.
Nov-27-09
Premium Chessgames Member
  Eyal: PPS <Jim> oops, I didn't read earlier what you wrote under the diagram in your post - I see now that you've mentioned the general point about the queen's control over the diagonal (and g1) yourself...
Nov-27-09
Premium Chessgames Member
  Eyal: And speaking of 28.Qf4 and tactics against f7, it should be noted that it creates the possibility of Bg5 as well as Bg7. Black's 28...axb3 and all 29th moves that place a heavy piece on the a-file (Qa6, Ra8, Ra5) deal adequately with <this> threat, because 30.Bg5 (which, unlike Bg7, doesn't threat an immediate mate) becomes too slow - Black simply doubles on the a-file.
Nov-27-09  Cdorf: 33.pxg4 is the best move followed by Rxp if 33...pxp or 34.Rxp if 33...Qa3. Sorry, new here, salute all men.
Nov-27-09  GaeBulg: I only considered Rxg4+ (at first Qxg4+ but I realized I can accomplish the same thing with only a rook sac) It didn't lead anywhere so I gave up haha. I didn't even consider Ne6+
Nov-27-09
Premium Chessgames Member
  patzer2: For today's Black Friday puzzle we were treated to a recent slugfest from the FIDE World cup, where both sides castled on opposite wings and raced to see who could mate first in a wild Sicilian Dragon.

White should have allowed the game to end in a draw with 27. Bg5 when Black would likely have claimed the draw by three-fold repetition with 27...Bg7 =. Instead he played 27. Rhg1+? when Black could have won after 27. Rhg1+? Kh7 28. Qf4 axb3 29. axb3 with the amazing obstruction sacrifice 29...Bg4!! (as previously noted by <Eyal>).

Indeed, after 29...Bg4!! 30. fxg4 Ra8 31. Bg7 Rg5! 32. e5 Qa5 Black, with a pair of obstruction sacrifices to defend his King and a mating attack underway on the opposite wing, is clearly winning.

Failing to find 29...Bg4!!, Black is lost after 29...Qa6? 30. Bg7! . Yes, today's puzzle solution and winning demolition with 33. Ne6+! is actually a follow-up to a mating attack and pursuit (King hunt) combination which began with 30. Bg7!

Nov-27-09
Premium Chessgames Member
  patzer2: To demonstrate that 30. Bg7! (along with the followup and puzzle solution 33. Ne6+!) initiated a deep pursuit (King Hunt) mating combination, note the final position of the game.

After 38. fxe7+ (final move of the game), the King pursuit might well have continued 38...Ke6 39. Qf5+ Kd6 40. Rd1+ Kc7 41. Qd7+ Kb6 42. Rd6+ Ka5 43. Qa7+ Kb4 44. Rb6#.

Nov-27-09  SufferingBruin: 1000 rating, trying to get better.

So there was this bus I had to catch. I sprinted as fast as my 46-year old knees would sprint and for a moment, I felt young. It was no more than a couple of dozen strides but for a brief time, every part of the body was moving in sync, each stride seemed to pull me closer to a moving vehicle toward me. It was, in a word, exhilarating. Then, sweat poured into my eyes, blinding me. My stride stiffened, I gasped to a halt and watched the bus drive away, each intake of breath providing more diesel exhaust for my burning lungs. Soaked with sweat, every fiber of my being screaming in pain, I asked what my body was asking: "Why the hell did I put in the effort?"

This is all I could come up with to describe just how badly I missed this problem.

Nov-27-09  sh8911: 33.Ne6+ pxe6 34.pxg4 white can push g pawn
Nov-28-09  dufferps: Like Vincent L, I was guessing 33 Nf5+. I was thinking (probably shortsightedly) that at worst I would trade my Knight for the black rook. Better, I could pin black's king until my pawn opened the g file.

I was amazed when I saw white moved 33 Ne6+. I thought surely black would capture the knight with f7xe6. Later, I played out some scenarios with 33 ... f7xe6. No matter what black did (Qa3 or Rf8 or Rg8), white opened the g file and bottled up and soon mated the black King.

I'm a long way from seeing that far ahead even when taking a long time to study the options, let alone in the pace and heat of a game.

Nov-28-09
Premium Chessgames Member
  Once: <SufferingBruin> Now that was seriously funny and well written! Thanks for giving me a chuckle.
Nov-28-09  Eduardo Leon: Now after looking at the position for 15 (!) minutes, I understand Eyal's suggestion <29...♗g4!!>. Black first ensures white won't create any further trouble in the kingside for at least two moves, and <only then> proceeds to double his ♕ and ♖ (the one in the 8th rank) in the a file.
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