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Alexey Shirov vs Vasyl Ivanchuk
Aerosvit (2007), Foros UKR, rd 10, Jun-28
Spanish Game: Closed. Bogoljubow Variation (C91)  ·  0-1

ANALYSIS [x]

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Given 12 times; par: 31 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
May-30-21
Premium Chessgames Member
  An Englishman: Good Evening: Solved it, in a manner of speaking. Another speculative sacrifice (was 28.Rb1 best?), you cannot see every variation and have to trust your judgment. Therefore, <stacase>, if you understood *why* Black played those two moves, you should feel content that you had solved it.

For me the problematic variation consisted of 28.Re1. Finally found 28...Bxf2+; 29.Kxf2,Qd2+ and 30...Rxf4+. 6/7 for the week; flubbed Saturday.

May-30-21  Walter Glattke: A) 26.-Bxd4!? 27.Bxd4 Nxd4 28.Re1 Nf3+ 29.Nxf3 exf3 30.Qe6+ Qxe6 31.Rxe6 Rxf5 -+ B) 26.-Nxd4 27.cxd4 Bxd4 28.Rf1 e3 29.Bf3 e2+ 30.Kg2 wins C) 27.Re1 Nf3+ -+
May-30-21  stacase: <An Englishman: ...if you understood *why* Black played those two moves, you should feel content that you had solved it.>

I go at these puzzles two ways:

1. What would I do over the board?

2. What's the obvious puzzle move?

Number two got the nod and the 2nd move the same but 28...e3 not so much, I would have taken the White's Bishop 28...Bxf2. I hadn't expected 28.Rb1

So understanding the <*why*> was a vague, take control of the center of the board for the price of a Knight that wasn't doing very much. I sort of thought Black's Queen would wind up on d4 and commence to be White's worst nightmare. That really didn't happen.

May-30-21  Brenin: 26 ... Nxd4 seemed rather easy for a Sunday, both to see and to justify on general grounds, as in <stacase>'s last paragraph.
May-30-21
Premium Chessgames Member
  agb2002: White threatens Qxe4 and Qxh5.

The defenseless white rook invites to play 26... Nxd4:

A) 27.cxd4 Bxd4

A.1) 28.Bxd4 Qxd4+ wins decisive material.

A.2) 28.Rb1 Bxf2+ 29.Kxf2 Qd3 with the double threat Qxb1 and e3+ followed by Qxg6.

A.3) 28.Rc1 Bxf2+ 29.Kxf2 Qd2+ wins decisive material.

A.4) 28.Rd1 Bxf2+ 29.Kxf2 Qxd1 wins decisive material.

A.5) 28.Re1 Bxf2+ 29.Kxf2 Qd2+ 30.Re2 (30.Kf1 Rxf4+ wins) 30... Rxf4+ 31.Kg3 h4+ wins decisive material.

A.6) 28.Rf1 e3 looks advantageous for Black (29.Bg3 e2+).

B) 27.Qxe4 Re8 followed by Ne2+ and Bxc3 or Nxf4 looks good for Black.

C) 27.Qxh5 Ne2+ and Nxf4 looks very good for Black.

D) 27.g5 Ne2+ 28.Kf1 Nxf4 29.Qxe4 Bxc3 30.Rb1 Qxg5 is winning.

May-30-21
Premium Chessgames Member
  agb2002: I missed the obvious intermediate check 30.Qe6+ in my line A.2.

A bit annoying.

May-30-21  Refused: Dark square weakness of white suggests Nxd4 and eventually the rook will crash in on f4, which makes life pretty awkward for the white king.

26...Nxd4 27.cxd4 Bxd4

(27.refusing the sac with 27.Qxe4 doesn't help, 27...Re8 and this is just horrible for black)

here white has a couple of choices.

a) 28.Bxd4 Qxd4+ is not one of those as a1 drops

b) 28.Rf1 trying to get more defenders to the king is running into 28...e3 (threat is obviously 29...e2+) 29.Bxe3 Bxe3+ 30.Kg2 Qd5+ 31.Rf3 32.Qd2+ Kh1 Qd1+ 33.Rf1 Qd5+ 34.Rf3 Bxf4 just leads to a hopeless pawn ending

c) trying to stop the e3 push with 28.Re1 Rxf4 offers very little to play except hoping the black allows a perpetual with Qe8-Qh5+ at some point.

d) 28.Rd1 bxf2+ is immediately curtains

e) 29.Rc1 Bxf2+ 30.Kxf2 Qd2 is also curtains

f) 29.Rb1 e3 30.Bg3 h4 31.Bxh4 Rxf4 I am not sure how white intends to keep the position from collapsin, but that might be the best bet.

May-30-21  mel gibson: That is the easiest Sunday I've seen in ages.
I saw it straight away as d4 was attacked by so many Black pieces.

Stockfish 13 says:

(26. .. Nxd4

(♘c6xd4 ♖a1-e1 ♘d4-f3+ ♘h2xf3 e4xf3
♖e1-e3 ♕d7-d1+ ♔g1-h2 ♕d1-d2 ♖e3xf3 ♕d2xa2 ♕g6xh5 ♕a2-c4 ♗f2-c5 ♖f8-a8 ♔h2-g3 ♕c4-f7 ♕h5-f5 a4-a3 ♗c5xa3 ♖a8xa3 ♕f5xb5 ♗f6xc3 ♖f3-d3 ♔g8-h7 ♖d3-e3 ♗c3-e1+ ♔g3-f3 ♖a3xe3+ ♔f3xe3 ♗e1-g3 ♕b5-d3+ ♕f7-g6 ♕d3-c4 ♕g6-b6+ ♔e3-e4 ♕b6-b1+ ♔e4-f3 ♗g3-h4 ♔f3-e3 ♕b1-e1+ ♔e3-f3 ♕e1-h1+ ♔f3-e2 ♕h1-g2+ ♔e2-d1 ♕g2-f3+ ♔d1-c2 ♕f3-f2+ ♔c2-d1 ♕f2-e1+ ♔d1-c2 ♕e1-e7 ♕c4-d3+ ♔h7-g8 ♕d3-d5+ ♕e7-f7 ♕d5-a8+ ♔g8-h7 ♕a8-e4+ ♕f7-g6 ♕e4xg6+ ♔h7xg6 ♔c2-d3 ♔g6-f7 ♔d3-c4 ♔f7-e6 ♔c4-c5 ♗h4-g3 h3-h4) +4.22/42 308)

score for Black +4.22 depth 42.

May-30-21  1stboard: What happens if White Plays 27 Qxe4 , I would assume Black plays then 27 Re8. Can White hold the position after that ?
May-30-21
Premium Chessgames Member
  chrisowen: Langoustine revile Nxd4 gunghos accommodate revile ahead retrospect guv langoustine manages lib joke its trick cop pq whey hey heady deffy vulcan its macks revile zugzwang gob jekyll watch its doot pry x divots revile Nh2 give it addendum avarice and Ng5 has adrift nefarious tot add gobble v iambic revile ago jog on hive it axled avarice cio daddy haggled its ditto u mit revile choose its thod its wag ply ebb Nxd4 deffy...
May-30-21  johnnydeep: Hmm, the online "ENGINE" analysis link determines:

1) mated-in-50 (27 ply) 35.Nxg2 Qxd3

How does it determine mate in 50 after only 27 plys?

May-30-21
Premium Chessgames Member
  chrisowen: Hive no d4 as ...
May-30-21  Diana Fernanda: Too much for me, Ivanchuk is the prototype of a fateful gamer, sometimes genius, sometimes deadly.
May-30-21
Premium Chessgames Member
  drollere: i rather quickly was looking at Nxd4. trade off, and get the R on a1 with check. apparently that was the answer.
May-30-21  njchess: Shirov overextends, and with White's attack fizzling, Black pounces by opening up the center. I got the game line of 26. ... ♘xd4 27. cxd4 ♗xd4 28. ♖b1 e3 29. ♗g3 h4! 20. ♗xh4 ♖xf4 -+ That's as far as I went and, considering White's position, I was surprised to see that Shirov didn't resign at that point.
May-30-21
Premium Chessgames Member
  Messiah: This one was oddly easy.
May-30-21  Hercdon: Ivanchuk at his best
May-30-21
Premium Chessgames Member
  chrisowen: In calm it is hug kind nd4 no?
May-30-21  SChesshevsky: <Diana Fernanda: ...Ivanchuk is the prototype of a fateful gamer, sometimes genius, sometimes deadly...>

Yes, solid and dangerous. No one likes to play against that. Think worth watching his banter blitz many times.

https://www.youtube.com/watch?v=D8I...

May-30-21
Premium Chessgames Member
  HeMateMe: Brutal
Oct-04-21  Gaito:


click for larger view

WHITE TO MOVE
In this position White exchanged rooks on e4, a move that Ivanchuk considered "dubious" in his annotations of Chess Informant No. 100. Instead, Chucky suggested 25.Nd2! (which incidentally is the move suggested also by engine SF14) and furnished some analysis intended to prove that Black would have obtained an edge. However, the engine disagrees, and considers the position after 25.Nd2 to be unclear or slightly favorable for White. Let's see a brief analysis done by Chucky with brief comments by the engine SF14 at 30 seconds per move: 25.Nd2! Rxe1+ (this move was suggested by Chucky but the engine prefers 25...Qe8) 26.Rxd1 hxg4 (the engine recommends 26...b4) 27.hxg4 Ne7 28.Qh5 g6 29.Qh3 Nc6 30.Nf3 b4 31.cxb4 Nxb4 32.Ne5 Bxe5. So far we have followed Chucky's own analysis from Chess Informant No. 100, see diagram below:


click for larger view

WHITE TO MOVE

From this hypothetical position (it never happened in the actual game) Ivanchuk gives 33.fxe5 Qf7 34.Re2 Qf4 and (in his opinion) Black stands better. Nevertheless, the engine (SF14) believes that it is much better to capture with the d-pawn thus: 33.dxe5! Rxf4 34.e6! and White has a winning advantage (computer evaluation: +3.72), or else 33.dxe5 Qe6 34.Qg3 and White has the edge. So this variation by the engine dismisses the idea that Black had the better game after 25.Nd2. Very interesting stuff.

Oct-04-21  Gaito: Every brilliant combination on the chessboard is the result of two factors: 1) The ability of the player who made the combination (he had to spot it and also he had to calculate its consequences), and 2) A mistake or oversight (or a series of mistakes) made that the player who allowed the combination to happen.

Without number 2 there would never be number 1.

In this case, Ivanchuk had the merit of "seeing and calculating" the combination that began with 26....Nxd4!! (number 1). Two exclamation marks for that move. But that combination would never have happened had White not made a mistake that allowed it to happen (number 2).

The mistake was of course 26.Nh2?? Two question marks for that move. See the following diagram:


click for larger view

WHITE TO MOVE
Where should the attacked knight retreat to?
In the actual game, the retreat 26.Nh2?? allowed the combination 26....Nxd4!!

Chucky was a nice guy because he appended at least one question mark to the move 26.Nh2. (Alekhine never appended question marks to the mistakes made by his opponents, because Alekhine always tried to prove that his combinations were predestined for the simple reason that he was a genius).

Correct was 26.Ng5! Bxg5 27.Qxg5 Qd6 28.f5 hxg4 29.hxg4 b4, and according to Ivanchuk "Black would have had the initiative in this position". See diagram below:


click for larger view

WHITE TO MOVE
Again the engine somehow disagrees with Ivanchuk's judgment. Stockfish 14 evaluates this position as equal or unclear. A likely continuation could have been 30.Qe3 Re8 31.Kg2 bxc3 32.Qxc3, reaching the following position:


click for larger view

Evaluation by the engine: 0.00.

Oct-04-21  Olavi: <according to Ivanchuk "Black would have had the initiative in this position". > and <Again the engine somehow disagrees with Ivanchuk's judgment. Stockfish 14 evaluates this position as equal or unclear. > are not contradictory.
Oct-04-21  SChesshevsky: <Gaito> Thanks for the looks at key positions in some great games. Though it's probably best with some caution when deconstructing GM analysis. Especially with guys at the level of Ivanchuk and his peer buddies.

In your line < Correct was 26. Ng5!...> Black clearly does have the initiative. With the passed pawn and forcing white back to defend c3. Now that's with the understanding that initiative means being able to force the play, or having some momentum, or the ability to push, though Fischer went with the idea of pull occasionally. Given the way engines work and their depth of calculation, don't think the concept/feeling would show up as a meaningful evaluation function.

Oct-04-21  Gaito: <SChesshevsky> I totally agree with what you wrote. Thanks for your comment.
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