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Vassily Ivanchuk vs Surya Shekhar Ganguly
Tradewise Gibraltar (2014), Catalan Bay GIB, rd 8, Feb-04
Queen's Gambit Declined: Semi-Tarrasch Defense. Exchange Variation (D41)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-06-15
Premium Chessgames Member
  agb2002: White has a bishop and a knight for a rook.

Black threatens 33... Rxe3.

White can attempt an attack against every black piece with 33.d6:

A) 33... Rxe3 34.d8=Q+ Re8 35.Ne6+ fxe6 (35... Kg8 36.Qxe8#) 36.Qxd1 + - [Q+B vs R+P].

B) 33... Rd8 34.Qe5 (threatening 35.Qd6+ Kg8 36.Qe7 and 35.Qc7 Ke7 36.Nc6+)

B.1) 34... Rxd7 35.Qb8+ Ke7 36.Nc6+ Kf6 (36... Ke6 37.Qe5#) 37.Qe5+ Kg6 38.Ne7+ Kh6 39.Qf4+

B.1.a) 39... g5 40.Qf6+ Kh5 41.Qxf7+ Kh4 (41... Kh6 42.Nf5#; 41... Kg4 42.f3+ and mate in two) 42.Nf5+ Kg4 43.Ne3+ Kh4 44.Qxh7#.

B.1.b) 39... Kh5 40.Qf5+ g5 (40... Kh6 41.Ng8#; 40... Kh4 41.g3#) 41.Qxh7+ Kg4 42.Qh3+ Kf4 43.Qf5#.

B.2) 34... Qd2 35.Qd6+ Kg8 36.Qe7 Qa5 (36... Rf8 37.d8=Q wins) 37.Qe8+ and mate next.

B.3) 34... Qg4 35.Bxb5

B.3.a) 35... Rxd7 36.Qb8+ (36.Bxd7 Qd1+ and mate next) 36... Ke7 37.Nc6+ Kf6 (37... Ke6 38.Qe5#) 38.Qe5+ Kg6 39.Ne7+ Kh6 (39... Rxe7 40.Qxe7 Qd1+ 41.Bf1 + - [B]) 40.Nf5+

B.3.a.i) 40... Kg6(5) 41.Qxg7+ followed by 42.Qxg4+ and 43.Bxd7 with a won ending.

B.3.a.ii) 40... Kh5 41.Ne3+ followed by 42.Bxd7 wins a piece and a pawn at least (42... Qd1+ 43.Nxd1).

B.3.b) 35... a6 36.Qe8+ Rxe8 37.dxe8=Q(R)#.

B.4) 34... f6 35.Qc7 Ke7 36.Nc6+ wins.

C) 33... Rb8 34.Qe5 followed by 35.Qd6+ Kg8 36.Qe7 winning.

D) 33... Ra8 34.Qe4 followed by 35.Qe5 transposes to B or C.

Mar-06-15
Premium Chessgames Member
  Once: It's a two part puzzle today. The first part of the puzzle is spotting that the promotion trick 33. d7 works. It seems to leave the white queen hanging, but black can't stop white from making another (and pocketing the rook into the bargain).

The sequence that everyone else has got (but which is worth repeating) is 33... Rxe3 34.d8=Q+ Re8 35.Ne6+ fxe6 36.Qxd1

So black can't take the queen. That means that a new puzzle starts from 33. d7 Rd8


click for larger view

This is trickier. White doesn't have a tactical smiting move, but he does have a strong position. He now needs to build his attack against the black king and rook.

This is where I got stuck in human mode. White has several tempting moves to reposition the queen and then infiltrate on the weak dark squares especially c7 and the d6-e7 diagonal. I looked at Qc3, Qf4, Qe5. Frankly it felt like being a billionaire in a Ferrari dealership. So many tempting choices!

Fritzie confirms what Patzer2 has also found. All these queen moves win, but 34. Qe5 is the strongest. It is the only move that simultaneously keeps the black king out of e7 and threatens Qc7 and Qd6+/Qe7.

And if 34...Rxd7 35. Qb8+ weaves a mating net from which black cannot escape.

Hmm. I think I'll award myself half a point today. I spotted the first half of the combination but not the cleanest finish to the second. I like to think I would still have won from here, but not as crisply as Ivanchuk.

Good puzzle.

Mar-06-15  morfishine: <33.d7> forces 33...Rd8 (33...Rxe3? 34.d8=Q+ Re8 35.Ne6+ fxe6 36.Qxd1 and White wins)

Great, forcing finish by Ivanchuk

*****

Mar-06-15  TheBish: Ivanchuk vs Ganguly, 2014

White to play (33.?) "Difficult"

White is already ahead two pieces for a rook, which is theoretically a winning advantage, but he has to be careful. His queen is attacked, and a move like 33. Qf4? fails to 33...Re1, winning the bishop with the threat of mate, with time to stop White's d-pawn afterward. White needs a forceful, powerful continuation.

33. d7! Rd8

Or 33...Rxe3 34. d8=Q+ Re8 35. Ne6+ fxe6 36. Qxd1 with an overwhelming advantage.

34. Qe5! (or 34. Qf4) Rxd7

Black lacks a good way to meet the threats of 35. Qd6+ and 36. Qe7, or 35. Qc7, e.g. 34...f6 35. Qc7 Ke7 36. Nc6+. Black ends the threat of a new queen, but now his king is flushed out to chants of "dead man walking!".

35. Qb8+ Ke7 36. Nc6+ Kf6

Or 36...Ke6 37. Qe5#.

37. Qf4+!

Saving e5 for the knight. Black's next move is forced since 37...Ke6 38. Qe5# is the mating pattern seen in the note above.

37...Kg6 38. Ne5+ Kh5 39. Qf5+! Kh6

Black gets mated after 39...g5 40. Qxh7# or 39...Kh4 40. g3#.

40. Ng4+ forces the win of the queen 40...Qxg4 41. Qxg4 for an easy win.

Mar-06-15  Nick46: Intuitively I played <33.d7> but won't award myself any further credits or pats on the back for all that.
Mar-06-15  diagonalley: ging ganguly guly guly guly gotcha, ging gang gu, ging gang gu(!) ... (after the scouts old fireside song) ... superb finish by ivanchuk... as <paavoh> pointed out - a prime example of Q+N co-operation
Mar-06-15  morfishine: <Nick46> As long as one sees that 33...Rxe3 fails, thats something
Mar-06-15
Premium Chessgames Member
  OhioChessFan: Not sure why a 2600 played this out to mate.
Mar-06-15  wooden nickel: Wonderful king hunt, although still a challenge for White to find the best continuations. 34. Nxb5 Qxd7 35. Nxa7 would have been an interesting endgame!


click for larger view

Mar-06-15  TheaN: Friday 6 March 2015 <33.?>

In theory, white is up in material, two pieces for the rook. However, in the current position black is pressing on one piece, and is in fact threatening to play 33....Re1 when the queen is moved, and it will become a problem for white to defend both the bishop and knight

So, we don't move the queen. <33.d7!> pawns on the sixth rank are dangerous, in the sense that the self dubbed 'seventh jump' can be one of strongest tempo gains in the game: white attacks the rook on e8 and meanwhile threatens to promote.

A) <33....Rxe3> does not work, because this allows white practically to replace his queen on d8 with the d-pawn off the board: <34.d8=Q+ Re8 35.Ne6+ fxe6 (Kg8 36.Qxe8#) 36.Qxd1 >. Two queens left the board, but one was a pawn. And it was not black's.

B) <33....Rb8 34.Qe5!> the point. If black does not put the rook on d8, this win immediately. With the rook on b8, it's truly forced that black plays <34....Rd8 35.Qd6+ Kg8 36.Qe7 > and black has no defense against both Qxd8+ and Qe8+.

C) <33....Ra8 34.Qe5> essentially not much difference, but black is not forced to replace the rook. The only sensible alternative loses, though <34....f6 (g6 35.Qh8#) 35.Qd6+ Kf7 36.d8=Q >

D) <33....Rd8 34.Qe5!> still! Although black attacks d7 directly and blocks d8, this is just as strong.

D1) <34....f6 35.Qc7 > c7 is also available to the white queen.

D2) <34....Rxd7> is key <35.Qb8+ Ke7 36.Nc6+ Kf6 (Ke6 37.Qe5#) 37.Qe5+ Kg6 38.Ne7+ Kh6 (Rxe7 39.Qxe7 should be won) 39.Ng8+ Kg6 40.Qe4+!> a long combination, but now black has three options that all lead to disaster:

D111) <40....Kg5 41.h4+ Kh5 42.Qf5+ Kxh4 (g5 43.Qxg5#) 43.g3#>

D112) <40....Kh5 41.Qf5+ g5 42.Nf6+ Kh6 (Kh4 43.g3#) 43.Qxh7#>

D113) <40....f5 41.Qe6+ Kg5 42.h4+! Kxh4 43.Qxf5! > and black has no adequate defense against 44.g3+/#.

Mar-06-15  TheaN: Sloppy that I missed 37.Qf4+; put things to an end way sooner. Nonetheless, what I posted is correct: especially the variation with 40....f5 is hard to see.
Mar-06-15
Premium Chessgames Member
  Penguincw: I considered 33.d7, but didn't want to play because I didn't see after 33...Rxe3 34.d8=Q+ Re8, 35.Ne6+!, and white is winning.
Mar-06-15
Premium Chessgames Member
  AvidChessMan: 33. d7 is the best move for white. The black rook is forced to block the white pawn’s advance. I like white next move, 34. Qe5, which gives the queen access to the back rank, thereby forcing the king out into the open. The d7 pawn was poisoned, in that sense.
Mar-06-15
Premium Chessgames Member
  kevin86: The pawn advance upset's black's position so much that he falls into a quick mate.
Mar-06-15
Premium Chessgames Member
  Jimfromprovidence: There's more to this puzzle than I first realized.

It begins 33 d7 Rd8 34 Qe5.


click for larger view

There are two threats; one is 35 Nf5, seeing 36 Qxg7# or 35 Nf5, seeing 36 Qe7+.

So to block both threats black first plays 34....Qg4. Next comes 35 Nf5 Qg5.


click for larger view

White now wins beautifully with 36 Qc5+ Kg8 37 Ne7+.


click for larger view

Mar-06-15
Premium Chessgames Member
  chrisowen: Describe at dutiful delights again dancers and danglers ave dampner d8 although decides dinkers queen's a fag pin at e3 dog i e5 love the centralised affair doorknob dugouts:

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Mar-06-15
Premium Chessgames Member
  whiteshark: Aargh, missed the winning 35.Ne6+ and went nuts thereafter.
Mar-06-15  scassislusor: I wonder whether Black was in time trouble since Rd7 was tantamount to resignation, somewhat like Nakamura last week with his move Kh6. The rest was inescapable in both cases which each player must have seen.
Mar-06-15  Chess Dad: All I was able to get was 33. d7.

I didn't find the correct move after 33... Rd8.

Mar-06-15  haydn20: About 4 times a year, as with this one, I see the move and the main lines in my mind's eye, without moving pieces on a board. Much more often, I am stumped by a lesser puzzle. I wonder if this is typical of a mediocre player like me?
Mar-06-15  stst: 33.d7

IF (A)..... RxQ
34.d8=Q+ Re8
35.Ne6+ fxN
36.QxQ and Black lost heavy material

IF (B).... Rd8 to block the P from queening,
34.Qf4 (eyeing for back rank + as well as Ne6+) RxP
35.Qb8+ Ke7
36.Nc6+ Kf6 (Ke6 ===> Qe5#)
37.Qf4+ Kg6
38.Ne5+ Kg5
39.g4+ Kh4
40.Nf3+ mate, or losing Q by QxN, then QxQ

time to check Chucky's choice

Mar-06-15  stst: got it!!

.. Chucky's choice of 34.Qe4 instead of Qf4 has the same effect -- protecting the N as well as eyeing for back rank Qb8+

The last steps of Black's defense actually ran softer in the game than moving the K further to the right files, but, probably Black saw the King was already somehow trapped.

Mar-06-15  houtenton: How comes that I had big problems with last wednesday and tonight (I just came back home late) I needed about 5 seconds to see the whole thing. Are there more with the same kind of experience? Less pieces on the board are more convenient to me.
Mar-06-15
Premium Chessgames Member
  Longview: This was a hard one to find a good move to make. The first I considered was d7 and the second was Qd3. I still found it difficult to get through what I though would be good defenses though. I favored Qd3 but Houdini says my first choice was the best! I see via <gofer> what I overlooked was Ne6+ clearing the file for Qxd1. I saw the other.

<33 d7 ...>

33 ... Rxe3
34 d8=Q+ Re8
35 Ne6+ fxe6
36 Qxd1

<Haydn>, pal I am right there with you. I tried the Ne6+ earlier, since it was a check, but as an initial move all I saw was the exposure of the e pawn to the Black Queen. I never thought of the reverse.

Great review guys. Makes it easy when you see the moves, eh.

Mar-06-15  CHESSTTCAMPS: White has the material advantage of N+B for a rook, in addition to a powerful passed pawn on the 6th rank, screened from capture by the active Nd4. It is known that Q+N can be superior to Q+R in many attacking positions. In this situation, the advanced pawn and the vulnerability of black's back rank enhance that advantage.

33.d7! takes full advantage of the opportunity. White's existing queen can not be taken and the rook is tied by the need to protect the back rank:

A) 33... Rxe3 34.d8=Q+ Re8 35.Ne6+ fxe6 36.Qxd1 wins.

B) 33... Rd8 34.Nc6 Rxd7 35.Qc5+ Kg8 (Ke8? 36.Qe5+ Kf8 37.Qb8+ wins) 36.Qxb5 (threatening Qb8+. Not 36.Ne7+ Kh8!, then 37.Qc8+ is met by Rd8) g6 37.Nxa7! and white appears to have a clear win by promoting the a-pawn. 37... Rxa7? 38.Qb8+ wins the rook)

B.1) 35... Qd6 36.Qxd6+ Rxd6 37.Nxa7 followed by 38.Nxb5 leaves white with a winning passed a-pawn.

B.2) 35... Rd6 36.Qxb5 Rd7 37.Nxa7 transposes to B.1.

C) 35... Rb8 36.Nc6 Ra8 37.d8=Q Rxd8 38.Nxd8 Qxd8 39.Qxa7 and white's extra piece prevails.

Time for review....

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