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Artur Yusupov vs Boris Gulko
Reykjavik Summit (1990), Reykjavik ISL, Mar-??
King's Indian Defense: Fianchetto Variation. Lesser Simagin (Spassky) (E62)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Jan-11-19  newzild: Not 35. Bxc4?? Rxh3 mate
The best chance is probably 35. Nxg6, when 35...fxg6 36. Qxc4 looks unclear, although Black also has 35...Nxg6 36. Bxc4 Rf3.
Jan-11-19
Premium Chessgames Member
  ChessHigherCat: Well, white can't play the LSB without getting mated by Rxh3, so how about

35. Qxf7+ Kxd8 (...Kd7 36. Qxf4 Bxe7 37. Bxc4 Rbb1 38. Bxe7 Rxe7 with big material advantage for honky dog) 36. Qxf8+ Kd7 37. Qxf4 (neutralizing the mating threat) Kxe7 38. Bxc4 and again victory shines on honky dog.

Jan-11-19  Granny O Doul: CHC: The fly in the ointment there is 35..Kxf7! 36. Bxc4+ Ke8.

f7 may be "the most vulnerable square", but there are times when it can take care of itself.

Jan-11-19
Premium Chessgames Member
  ChessHigherCat: Damn, I looked at every variant except the obvious KxQ!:

35. Qxf7+ Kxf7 36. Bxc4+ Ke8 37. Bxb3

and honky dog goes down in flames.

Jan-11-19  SamAtoms1980: How much of this were we supposed to see? I got as far as 35.Nxg6 fxg6 36.Qxc4 or 35....Nxg6 36.Bxc4.

When the position looks like kittens have been tossing the pieces around, I usually have trouble.

Jan-11-19
Premium Chessgames Member
  An Englishman: Good Evening: The real puzzle--how on earth did this position arise?! Even after playing through the game, it still did not seem possible.
Jan-11-19  Walter Glattke: 35.Bxc4 Rxh3# / 35.Nxg6 Nxg6 36.Bxc4 Rc7 37.Bd5 Ra7 38.Ba5 R1e7 39.Bb4 Ra6 40.f4 wins. (37.-Kxd8 38.Bxc7 wins)
Jan-11-19  Walter Glattke: Ending: White can stop the d-pawn with king and bishop always.
Jan-11-19
Premium Chessgames Member
  Jimfromprovidence: Black also can respond to 35 Nxg6 with 35...Rxf1, below, keeping the mate in one threat 36...Rxh3 in play.


click for larger view

It's interesting how white forces his way to a win from this position.

Jan-11-19  payan: I think the 35-...Rh3+ is a little tricky (and not good enough) but black can resist more than the main game
Jan-11-19
Premium Chessgames Member
  jith1207: <JimFromProvidence>: that was fun as well.
Jan-11-19  Cheapo by the Dozen: One of those puzzles about which I note that it's MUCH easier to see what must be tried than it is to make sure that it actually works. In the initial position, White has 3 hanging pieces and faces strong mate threats, while Black's only apparently hanging piece is utterly poisoned. So he has to play a forcing move, and only one of those makes possible sense. The first move on which he has a real choice is 38, and at that point there are at least three choices that each get better than +3.00 from the engine.
Jan-11-19
Premium Chessgames Member
  porcorum: After 35 Nxg6 black has 35 ... Rxh3+ 36 K-g1 Rxf1+ 37 Kxf1 R-h1 mate
Jan-11-19  mel gibson: I saw the solution move but it didn't look good.

Stockfish 10 says:

35. Nxg6

(35. Nxg6 (♘e7xg6 ♖b3xh3+ ♗f1xh3
♘f4xg6 ♗d8-g5 ♖e1-e2 ♔h2-g1 ♖e2-e5 f2-f4 ♖e5-e1+ ♔g1-f2 ♖e1-b1 ♗h3-f1 ♖b1-b2+ ♗f1-e2 ♘c4-b6 ♗g5-f6 ♖b2xe2+ ♔f2xe2 ♘g6xf4+ ♔e2-f3 ♘f4-g6 ♗f6-g7 ♘b6-a4 ♗g7xf8 ♘g6xf8 ♔f3-e4 ♔e8-e7 ♕g8-g5+ ♔e7-e6 ♔e4-d4 ♘a4-c5 ♕g5-d8 ♘f8-d7 ♕d8-e8+ ♔e6-f6 ♔d4-d5 ♔f6-g5 ♕e8xf7 ♔g5xg4 ♕f7-g8+ ♔g4-h5) +5.32/36 158)

score for White +5.32 depth 36

Jan-11-19  Cheapo by the Dozen: <An Englishman>,

Good question. It reminds me of a basketball game where not a lick of defense is played by either team.

Jan-11-19  goodevans: <porcorum: After 35 Nxg6 black has 35 ... Rxh3+ 36 K-g1 Rxf1+ 37 Kxf1 R-h1 mate>

Yeah, but...

After 35...Rxh3+ white has 36.Bxh3.

35...Rxh3+ may well be black's best defence. The following line has a few points of interest:

35...Rxh3+ 36.Bxh3 Nxg6 37.Bg5 Re2 38.Bg2 <threatening 39.Bc6#> 38...Nce5 39.Bd5 <threatening 40.Qxf7+! Nxf7 41.Bc6#> 39...Rxf2+ 40.Kg1 Rf3.

The R is immune to immediate capture and black is defending all immediate threats. On the downside, though, all black's pieces are totally tied up (practically zugzwang) and he's totally helpless against <41.a4>.

Jan-11-19  dTal: Why did Black play 33... Ke8 and not 33... Rxf1? What is the threat? This is two moves before the puzzle position.
Jan-11-19  Knightenprise: Otherwise 34.Qg8 is mate - 33...Ke8 allows the bishop to interpose on f8.
Jan-11-19  dTal: Omigawd. Chess blindness at its best. Can you believe I did not see 34. Qg8. :-(
Jan-11-19  saturn2: I saw 35 Nxg6

35...Nxg6 36. Bxc4 Rb7 (Rf3 same way) 37. Bxf7+ Rxf7 38. Qxg6. It is Q vs 2R and 3 plus pawns

35..Rxf1 36. Qxf8+ Kd7 37. Nxf4
clear material plus

For following 2 lines I had to use the board

35..fxg6 36. Qxc4 Rxf1 37. Qxb3 Kxd8 38. Qf3 Ne6 39. Qf6+ Kd7 40. Qf7+ winning a piece

35..fxg6 36. Qxc4 Rbb1 37. Qxf4 Rxf1 38. Bh4 2 plus pawns

Jan-11-19  TheaN: Friday 11 January 2019

<35.?>

This very interesting Friday (after debunking on yesterday's b5 defense, so decided not to post, darn it) is what I would call <defender trickery>. This position has so many defenders under pressure, finding the correct sequence can be very delicate. This is where silicon shines: it's all deduction to the correct line.

At move 35, a lot is already en prise (Bd8, Ne7, Nc4, and Bf1), and the only piece White can capture is poisoned due to a delicate mate net from h3. So, lets fire it up with <35.Nxg6!>

Lets picture this. En prise are <Bd8, Bf8, Ng6, Nf4, Nc4 and Bf1>, three White and three Black pieces. Anything that Black does to either White piece weakens his position fatally: because Black has the Rooks his coordination cannot be hampered with too much or the Queen runs rampart.

A) 35....fxg6, exposing Nc4, 36.Qxc4 +- forking Rb3 and Nf4.

B) 35....Nxg6, removing a defender of h3, 36.Bxc4 +-, forking Rb3 and f7.

C) 35....Kxd8, not solving the issue on f8, 36.Qxf8+ Re8 37.Qxf7 +-, forking the Knights and diffusing the mating net.

D) Black's best is to fire the counterattack <regardless> of everything being defended, as White has problems of his own: 35....Rxh3+!? 36.Bxh3 (Kg1 Rxf1+ 37.Kxf1 Rh1#) Nxg6, and for the time being, it seems as if Black diffused most threats with an acceptable position. However, beyond the horizon White has the game in control because of 37.Bg5!, the idea being 37....Nxa3 38.Bg2 and the mate threat renders Pa3 immune, and will eventually decide the game.

Very interesting game.

Jan-11-19
Premium Chessgames Member
  Jimfromprovidence: FWIW, white wins after 35 Nxg6 Rxf1 via a good old-fashioned king hunt

36.Qxf8+ Kd7 37.Qe7+ Kc6 38.Qc7+ Kb5 (38...Kd5 39 Nxf4+ Ke5 40 Qxc4,etc.) 39.Qb7+ Kc5 40 Qxb3, finally picking up a rook.


click for larger view

Jan-11-19
Premium Chessgames Member
  agb2002: White has the queen, a bishop and a pawn for the rooks and a knight.

Black threatens Rxf1 followed by Rxh3#.

White has Bg2, Nd5 and Nxg6.

In the case of 35.Nxg6:

A) 35... Nxg6 36.Bxc4 Rb7 37.Bxf7+ Rxf7 38.Qxg6 wins two pawns.

B) 35... fxg6 36.Qxc4

B.1) 36... Rb2 37.Qa4+ Kf7 (37... Kxd8 38.Qa5+ and 39.Qxe1 wins decisive material) 38.Qxf4+ Ke8 (38... Kg7 39.Qd4+ and 40.Qxb2 or 38... Kg8 39.Bc4+ win decisive material) 39.Qa4+ Kf7 40.Bc4+ wins decisive material.

B.2) 36... Rf3 37.Qc6+ Kxd8 38.Qxf3 seems to win decisive material.

B.3) 36... Rxa3 37.Bg5 d5 38.Qc6+ Kf7 39.Bxf4 Rxf1 40.Qxd5+

B.3.a) 40... Ke7 41.Bd6+ wins decisive material.

B.3.b) 40... Ke8 41.Qb5+ and 42.Qxf1, etc.

B.3.c) 40... Kf6 41.Be5+ (or perhaps 41.g5+) 41... Ke7 (41... Kg5 42.Bg7+ and mate in two) 42.Bd6+ as above.

B.3.d) 40... Kg7 41.Be5+ Kh6 (41... Kh7 42.Qf7+ wins) 42.Qf7 looks winning. For example, 42... Bc5 43.Bg7+ Kg5 44.Qd5+ Kf4 45.Bh6+ g5 46.Bxg5#.

C) 35... Rxf1 36.Qxf8+ Kd7 37.Nxf4 wins decisive material.

Jan-11-19  cormier:


click for larger view

Analysis by Houdini 4 <d 25 dpa done

1. = / + (-0.44): 23.Qc2> Bc3 24.Rxb3 Nxb3 25.Bxe4 Bxe1 26.Bxd5 Nc5 27.Qe2 Qb8 28.Nb5 Re7 29.Kg2 Ne6 30.Qd3 Re8 31.Bc6 Rc8 32.Bd5 Ba5 33.a4 Re8 34.Bc6 Rd8 35.Qd5 Bb6 36.Bd2 Rc8 37.Qe4 Bc5 38.Bb7 Rd8 39.Bd5 Re8 40.Bc6 Re7 41.a5

2. = / + (-0.62): 23.Qxd5 Nc3 24.Nc6 Nxd5 25.Nxd8 Nxe3 26.Rxe3 Rbxe3 27.fxe3 Bxa3 28.Rb8 Kg7 29.Bd5 Rxe3 30.Rb5 Re5 31.Kf1 Bb4 32.Nxf7 Rxd5 33.Rxd5 Kxf7 34.Rb5 Bc3 35.Ke2 Nc6 36.Rb6 Nd8 37.Rxd6 Bf6 38.Kf3 Be7 39.Ra6 Ne6 40.Ke3 Nc5 41.Rc6 Bg5+ 42.Kf3 Ne6 43.Ra6 h6 44.Ra7+ Be7 45.Ra6 Bf6 46.Ra7+ Be7 47.Ra6

Jan-11-19  cormier:


click for larger view

Analysis by Houdini 4 <d 22 dpa done

1. = / + (-0.66): 21.Be3> Rxb2> 22.Rab1 Rxb1 23.Rxb1 Nc3 24.Bxd5 Nxb1 25.Qxb1 Re5 26.Qd3 Qd7 27.Nb5 Nb7 28.a4 Nc5 29.Qd1 Bf8 30.Nc3 Re7 31.Nb5 Bg7 32.Kg2 Be5 33.Qc2 Re8 34.Bxc5 dxc5 35.Qxc5 Qd8 36.Qc4 Re7 37.Qe4

2. - / + (-0.99): 21.Qxd5 Re5 22.Qd1 Nxf2 23.Kxf2 Qb6+ 24.Kf1 Qxa7 25.Rxe5 Bxe5 26.Qe2 Nb3 27.Be3 Nd4 28.Rb1 Qa4 29.Qd2 Nc2 30.Bh6 Nxa3 31.Rc1 Qb5+ 32.Qe2 Bxb2 33.Qxb5 Nxb5 34.Re1 Nc3 35.Kf2 d5 36.Bf4 Rc8 37.Be5 Ba3 38.Kg3 Rc4 39.Re3 d4 40.Rd3 Be7

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