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Denis Khismatullin vs Zhou Jianchao
Aeroflot Open (2012), Moscow RUS, rd 2, Feb-08
Indian Game: Anti-Grünfeld. Alekhine Variation (D70)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Apr-24-12  LoveThatJoker: <sevenseaman> An ADDENDUM to #71483:

1. Rf1 Bxc3 2. bxc3 Qg4 3. Bxf7+ Kh8 4. Qd4+ e5. 5. Qf2! and Black can resign

LTJ

Apr-24-12
Premium Chessgames Member
  gofer: <sevenseaman:>

#71483 1 Rf1

#41962 1 Qa4+

#15221 1 Qh8+ Kf7 2 Bh5#

Apr-24-12
Premium Chessgames Member
  SuperPatzer77: <newzild ... c) 33...Rf7 34. Rh8+ Kf7 35. g8=Q+ Ke7 36. Rh7+ >

<newzild> 33...Rf7, 34. Rh8+ Kf7 should be illegal. Do you mean 33...Rf6?

33...Rf6, 34. Rh8+ Kf7, 35. g8=Q+ Ke7, 36. Rh7+

<newzild> You probably made a typo - 33...Rf7. The correct one is 33...Rf6.

SuperPatzer77

Apr-24-12  sevenseaman: Thanks <gofer> and <LoveThatJoker>. Both accurate. Very nice and it helps keep my own head from turning.

<LTJ> as is his wont goes into detail. I am guessing your typing speed must be very high. I envy people who can type w/o having to look at the keypad.

I am a two finger typist and I need to look at the keypad all the time. I do not know how to wean myself away from this obligation that keeps me to tortoise speed.

Apr-24-12  LoveThatJoker: <sevenseaman> Very good observation: I am indeed a touch-typist. :)

Thank you for the kind compliment on the puzzle too, btw!

I appreciate it,

LTJ

Apr-24-12
Premium Chessgames Member
  CHESSTTCAMPS: WHite is up B+P for a knight with an ideal attacking position for the major pieces. To finish this obviously winning position, two forcing moves come quickly to mind: 31.Qxg7+ and 31.Qxh7+. The latter should be analyzed first (especially in a time pressure situation) on the basis of the more limited options allowed to black. In fact, a quick win is found by following the natural continuation.

31.Qxh7+ Rxh7 32.Rxh7+ Kg8 33.g7 and the g7 pawn becomes a "superpawn"(=Q+R), supporting the primary threat of 35.Rh8+:

A) 33... Nxg7 34.R1xg7#

B) 33... Kxh7 34.gxf8=Q winning (superpawn line #1)

C) 33... Nf6 (or Nc7) 34.Rh8+ Kf7 35.Rxf8+ Qxf8 36.gxf8+ leaving white a rook ahead (superpawn line #2).

D) 33... Qe7(or other Q moves) 34.Rh8+ Kf7 35.gxf8=Q+ (superpawn line #3).

E) 33... Rf6 (Rf7 34.Rh8#) 34.Rh8+ Kf7 35.g8=Q+ Ke7 36.Rh7+ forces mate.

Apr-24-12
Premium Chessgames Member
  kevin86: White will win VERY quickly!
Apr-24-12  James D Flynn: Candidates 31.Qh7+, Qxg7+ and f6. f6 wins a piece after Rxf6 but both Qxf6 and Nxf6 seem to hold. 31.Qxg7+ Kxg7 32. Rh7+ Kf6(Kg8 transposes to the Qxh7+ line) g7 33.Rg6+ Kf7 and there is no clear win. Therefore 31.Qxh7+ Rxh7.32.Rxh7+ Kg8 32.g7 now if Nxg7 32.Rgxg7# if Rf6 or Rxf5 32.Rh8+ Kf7 33.g8(Q)+ and wherever the K moves a R will check on g6 or h7 and whatever inter poses will be taken with mate next, if Kf7 g8(Q)+ and mate on g6 next, if Kxh7 33.gxf8(Q) and White threatens mate in 2 by Rh1+ or by Qg8+ and Qg6# Black can temporarily defend Black can defend against one by Qh4 and the other by Qf6 bot not both.
Apr-24-12  Mojodomo: I've got the same question as <chrisowen>: <A 24.nf5 or door book gxf5 call bluff both look equal to me unless white has a neat tactical blow slide.>

24. Nf5 gxf5
25. gxf6 Qxf6

...seems to keep the threats under wraps, no?

p.s. First time poster, glad to be here.

Apr-24-12  dragon player: There's a lot of pressure on the g and h-file. There must be a sac to win with. I think this works:

31.Qxh7+ Rxh7
32.Rxh7+ Kg8
33.g7 Rf6
34. Rh8+ Kf7
35.g8(Q)+

with a winning attack.

Time to check.

-------------

Indeed, black didn't wait to be mated, but resigned.

2/2

Apr-24-12
Premium Chessgames Member
  agb2002: White has a bishop and a pawn for a knight.

Black would probably consider Qb6 and Qb2+.

White attacks the black castle with four pieces and two pawns and Black defends with less forces. This suggests a destructive sacrifice 31.Qxh7+ Rxh7 32.Rxh7+ Kg8 33.g7:

A) 33... Nxg7 34.Rgxg7#.

B) 33... Kxh7 34.gxf8=Q and mate soon.

C) 33... Rf6 34.Rh8+ Kf7 35.g8=Q+ Ke7 36.Rh7+ and mate soon.

D) 33... Rf7 34.Rh8#.

E) 33... Qf6 34.Rh8+ Kf7 35.gxf8=Q#.

F) 33... Nf6 34.gxf8=Q+ Kxf8 35.Rh8+ Kf7 (35... Ke7 36.Rg7#) 36.Rxd8, etc.

G) 33... Nc7 34.gxf8=Q+ is similar to F.

Apr-24-12  Dr. J: many commentators: <31 Qxh7+ Rxh7 32 Rxh7+ Kg8 33 g7 Kxh7 34 gxf8=Q >

Better yet is 34 f6+ Kh6 35 gxf8=Q+ 36 Kh5 Qh8#

I didn't solve it. It did not occur to me that g7 could win without being a check.

A good puzzle, but definitely not Tuesday material.

Apr-24-12  cyclon: Late, but 31. Qxh7+ Rxh7 32. Rxh7 Kg8 33. g7 ( threats 34. Rh8+) -Kxh7 <( 33. -R- 34. Rh8+/ -Kf7 34.g8Q++/ -Nf6 34. gxf8+ Kxf8 35.Rh8+/ -Nxg7 34. Rgxg7X all overs )> 34. gxf8Q White is Rook and couple of pawns up.
Apr-24-12  LoveThatJoker: <Dr. J> In the line you have presented, 31. Qxh7+ Rxh7 32. Rxh7+ Kg8 33. g7 Kxh7 34. f6+, you didn't include analysis on 34...Kg8 which leads to a very complicated position - one in which seeing a clear win is not as obvious.

Position after 34...Kg8 from Dr. J's line


click for larger view

White's attempt to win here is via 35. Bh7+ Kf7 (35...Kxh7? 36. gxf8=Q and White is probably winning) 36. Bg6+ Kg8 (36...Kxf6?? 37. gxf8=Q#) 37. f7+ (37. Bh7+?! Kf7 and White has to be wary of not drawing by repetion) 37...Kxg7 (37...Rxf7 38. Bxf7+ is a clear win for White) 38. fxe8=Q Rxe8 39. Bxe8+ and 40. Bxa4 when White has the advantage, but there is still a game left to be played - and Black has managed to at least preserve his Q, which may give him drawing chances.

Therefore, it is clear that White must play 31. Qxh7+ Rxh7 32. Rxh7+ Kg8 33. g7 Kxh7 34. gxf8=Q for a clear win.

LTJ

Apr-24-12  BOSTER: This is the position couple moves before <POTD> with black to move.


click for larger view

If they analyze this pos. correctly they would play very sharp e4, attacking the bishop on d3 and opening the diagonal for queen on f6.

I guess that what <LTJ> called <phenomenal moves 29.Be4 and 30.Nc2> will not even exist.

Apr-24-12  LoveThatJoker: <BOSTER> According to Stockfish, it's interesting to note that even had Black played 28...e4, he still would have been lost.

Analysis Diagram - Position after 28...e4


click for larger view

Here is the winning line that it gives:

28...e4 29. gxh7+ Kh8 30. fxe4 Qb2+ 31. Kd1 Rg7 32. Rxg7 Nxg7 33. f6 Qxf6 34. Qxf6 Rxf6 35. Kd2 Rf2+ 36. Ke3 Rxa2 37. Nc2 Rb2 38. Ra1 Nb6 39. Kd2 Nd7 40. Rxa6 Rb6 41. Ra8+ Kxh7 42. e5+ Kh6 43. e6 Ne5 44. e7 Rb7 45. e8=Q Nxe8 46. Rxe8 (+4.12)

LTJ

PS. Yes I recognize that had Black played 28...e4, White would have had no time for purposeful waiting moves. Nonetheless, I'm glad that I could relay Stockfish's line to you for your enjoyment.

Apr-24-12  Dr. J: <LTJ> You are of course correct that my <34 f6+> is a lemon. In the words of a recent presidential candidate, "Oops."
Apr-24-12  LoveThatJoker: <Dr. J> Good for you for keeping an open mind and not following the pure trend, but asking some seriously important Chess questions!

Keep coming everyday to solve the puzzles, man.

Your friend in Chess,

LTJ

Apr-24-12
Premium Chessgames Member
  SuperPatzer77: <Dr. J: <LTJ> You are of course correct that my <34 f6+> is a lemon. In the words of a recent presidential candidate, "Oops." >

<Dr. J> You're not alone! I'm one of them who made a dumb mistake like 34. f6+. I admit it is a big "Ooooops". Of course, 34. gxf8=Q (<newzild> and <LTJ>'s idea) is much better than 34. f6+.

<Dr. J> I'm dumber than you because I'm a SuperPatzer who cannot fly like a Superman always can - LOL LOL.

SuperPatzer77

Apr-24-12  Vanish Doom: A Tuesday puzzle which is way harder than the Saturday puzzle three days before? Huh?
Apr-24-12  James D Flynn: We all agree that Rxh7+ wins but I am having 2nd thoughts about Qxg7+ which in my post did not lead to a clear win. 31.Qxg7+ Kxg7 32.Rxh7+ Kf6 33.g7 Nxg7 34.Rg6+ Kf2 35.Rgxg7+ Ke8 36.f6 Rxf6 37.Rg8+ Rf8 38.Bg6# or 36.Qxf6 Rb7 and the threats of 37.Rb8+ Qd8 38.Bg6+ Rf7 Rh8+ seems to win. 37...Qf4+ 38.Kb1 Nc3+ 39.Kb2 Na4+(or Nd1+) 40.Kb3 and the only check remaining is Qe3+ and 41.Nxe3 is curtains. Of course 31....Nxg7 32.Rxh7+ Rh1and there is no answer to the threats of Rh8+ and R1h7#.
Apr-24-12  karnak64: This is another one of those puzzles where "how we got here" was more interesting than "what do we do now."

For this patzer, 24. Nf5 was eye-popping.

Apr-24-12
Premium Chessgames Member
  SuperPatzer77: <James D Flynn> In my opinion, 31. ♕xh7+! is much better than 31. ♕xg7+ because the Black King is forced to stay in the back rank.

31. ♕xh7+! ♖xh7, 32. ♖xh7+ ♔g8, 33. g7! ♔xh7 (33...♘xg7, 34. ♖gxg7#), 34. gxf8=♕

31. ♕xg7+ allows the Black King to escape from the back rank. It may be complicated.

SuperPatzer77

Apr-25-12  TheBish: <M.Hassan and backyard pawn>

After 33...Nf6, I came up with 34. gxf8=Q+ Kxf8 35. Rh8+, and if 35...Ke7 36. Rg7#. So after 35...Kf7 36. Rxd8, White is up 2 rooks!

Mar-28-16  Exploding: In this game Zhou played badly. First of all, On the 24th move he should by no means take the advantage by 24...gf5! 25.g6 fg6 26.♖g6 ♗e8 27.♖hg1 ♖a7 28.gf5 ♕b7 29.♖g7 ♕g7 30.♖g7 ♖g7 (-0.51 Depth=25 Houdini 3 x64). Second, at move 25 he should played 25...♘f6!, when 26.♘d6 is met by the unexcepted 26...♕g7! 27.♕g7 ♔g7 when the threat of 28...♘h5 is very unplesant. So white has to go for the break 28.h5! ♘h5 (Best) 29.♖h5 ♖f3 30.♔d2 ♘b2! 31.♗c2 ♖a3 32.♖e5 (+1.02 Depth=20 Houdini 3 x64), when the two connected passed pawns in the center gives good winning chances for white. Finally, at move 26 the typical move 26...g5! would have closed the h-file. Though after 27.♖g5 ♔h8 28.♖g6! (+1.97 Depth=18 Houdini 3 x64) white is still winning anyway at this point.
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