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Arkadij Naiditsch vs Thien Hai Dao
Mindsports (2008) (rapid), Beijing CHN, rd 8, Oct-11
Sicilian Defense: Najdorf Variation (B90)  ·  0-1

ANALYSIS [x]

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Jul-09-10  vangogh228: Isn't the answer to
31.... Rc3

32.Qe2

???

Seems to me there's nothing left for Black to do after that. Then again... I haven't played well in a long time.

Jul-09-10  Bons92: <This isn't that puzzling...

34 Nc7 is absolutely crushing.

If 35 Ra2 then 35...Ra8 is lights out.>
I think that 36.Rdd2 can save White..The c3 pawn can't move because of the pin

Jul-09-10  TheChessGuy: <vangogh228> On 32.Qe2, ...Rxb3+ forces the win or a strategically lost position. White has three alternatives: 33.Qb2 Qxb2# If 33.Kc2, Black mates on b2 again. 33.Ka1 Rxg3! 34.hxg3 b3 35.Qb2 Qa4 36.Re1 f6 37.Re3 bxa2 38.Qxb5 Qxb5 39.Rxb5 fxg5 40.Kxa2 Nf6 and Black wins by offing White's weak e-pawn and advancing his kingside pawns(analysis by Deep Rybka 4 on the last variation). To see all of this in a rapid game, under huge time pressure, would have been extremely difficult for even a rapid monster like Anand.
Jul-09-10  MiCrooks: It doesn't save White as Black just trades rooks and then confidently improves the position of his pieces with Ne6. White is totally tied down and Black will eventually bring his Bishop to a3 with great effect. Black is down an exchange but the position of his King coupled with Black's powerful passed pawn more than compensate for it.
Jul-09-10  ZUGZWANG67: Black is a p up, but it's one of the sitting ducks on the b-file. But still, W's b-pawn might be vulnerable after all and when it disapears, White might have a mating attack and/or a strong passed pawn. So my candidates are basically 31...Rc2 and 31...Rxc3. The idea of ...Nc7-e6-d4 does not fit well here: White has 32.Qf6+. In 31...Rc2 32.Kxc2 Qxa2+ 33.Kd3(c1) Qxb3+ 34.Ke2, I don't see much to be gained. So 31...Rc3. This threatens ...Rxb3-b2 with mate in stock, and interfering at the same time along the 3rd rank. The most obvious for W is 32.Nxc3, but 32...Qxb3+ and 33...bxc3 renews the threat. I'm trying to find a defense, but just can't, the attack on the WQ being too strong: 32.Bxe5+ Bxe5 33.Rxe5 (forced: the BB was covering b2) 33...Rxf3. Time to check.

----------

I' m about on the spot this time. I love you guys. Let's see the other posts.

Jul-09-10  YouRang: Yes! Saw the whole thing:

I definitely wanted to play ...Qxb3+, but I can't very well do that with the opposing queen guarding b3, can I? Ah, but then I noticed that I can interpose a rook at c3 <31...Rc3>, which is guarded by a pawn.

True, the rook can be taken by the knight <32.Nxc3>, but whether it's a rook or a knight, it still allows me to take the pawn <32...Qxb3+>, which pretty much forces <33.Ka1> (if 33.Kc1? then 33...bxc3 threatens ...Qb2# with no good way to stop it [e.g. 34.R5d2 cxd2+ 35.Kxd2 Qxf3 ])

What now? We can play 33...bxc3, but then after 34.Rfd2 our attack seems to have fizzled because our Pc3 is pinned (34.cxd2? Qxb3).

However -- we can force the white king back to b1: <33...Qa3+! 34.Kb1> and NOW <34...bxc3>. Again, we threaten ...Qb2# and this time 35.R5d2 fails to 35...c2+! [the point of putting white's K on b1] 6.Kxc2 Qxf3 .

The white king can make a run for it with <35.Kc2>, but then <35...Qb2+ 36.Kd3 c2!> will win a rook for a pawn.

Jul-09-10  ZUGZWANG67: <David2009: Does anyone know what should happen after 31...f6?>

I think that B must be careful with the way W's pieces are pointing towards it's K-side. Say 31...f6. What about 32.Rxd6(!?) ? Because, after all, once the BB disapears W has Bxe5+! If we continue the analysis, 32...Nxd6 33.Rxd6 Rxd6 34.gxf6+ Rdxf6 (not 34...Rfxf6? 35.Bxe5!) 35.Bxe5. After that, the BQ would like to come to the rescue with 35...Qa6, but this loses the b4-pawn, when 36.Nxb4, followed by 37.Nd5 is strong.

I'm not claiming my analysis as being flawless (I did that OTB, with no software and without moving the pieces), but I believe it would be dangerous waking-up the sleeping W pieces by opening the K-side.

I'll give an other post with what ChessPartner has to say about it.

Peace!

Jul-09-10  tacticalmonster: candidate: 31 Rc3

a) 32 Nxc3 Qxb3+ 33 Kc1? bxc3 34 Qe2 Ba3+ 35 Qb2 Qxb2#

b) 32 Nxc3 Qxb3+ 33 Ka1 Qa3+! (33 bxc3?? 34 R5d2! Nc7 35 Ra2 Ra8 36 R1d2! ) 34 Kb1 bxc3 35 Qe2 (33 Qf2 or Qg2 c2! 34 R5d3 cxd1=Q+ ) Nc7! 36 Qa2 Ra8

c) 32 R1d3 Qxb3+ 33 Ka1 Rxd3 34 Rxd3 Qe6

Jul-09-10  scormus: This is a fascinating puzzle, made harder, not easier by looking at the game. I have to agree with the posts that said neither player found the best moves. W's replies were obvious (as opposed to correct) as perhaps were B's, which made it fairly easy to find the game continuation.

<Fritz's 33 ... Nc7> looks the part and B is threatening everything in sight ... just as long as W cannot make any trouble with Qf6+ (though I dont see what more he can do).

Jul-09-10
Premium Chessgames Member
  johnlspouge: Friday (Difficult)

Naiditsch vs Dao Thien Hai, 2008 (31...?)

Black to play and win.

Material: Up a (doubled) P. The White Kb1 has 1 legal move, a1, x-rayed by Qa3 through the White Na2. The White Qf3 bears the burden of preventing Qa3xb3+. Black has a generally inferior position, except for the possible vulnerability of Kb1. The vulnerability suggests intensifying the attack on Na2 or Pb3. The Black Kg7 is vulnerable to Qf3-f6+, but Ne8 protects f6.

Candidates (31...): Ra6, Rc2, Rc3

[31Ra6 32.R1d2 does not seem decisive]

[31Rc2 32.Kxc2 Qxa2+ 33.Kd3 Qxb3 34.Ke2 is insufficient]

31...Rc3 (threatening 32Rxf3 or 32Rxb3+ 33Qb2#)

(1) White can accept the sacrifice:

32.Nxc3 Qxb3+ 33.Ka1 [Kc1 bxc3 then the threat 34Qb2# or 34Bh3+ suffices]

33bxc3

(1.1) 34.R5d2 [R1d2 Qc1+ 35.Ka2 cxd2]

34Qa4+ 35.Kb1 [Ra2 Qxd1+] cxd2, leaving Black up N+P, suffices

(1.2) 34.Qf2 [Qe2 or Qg2 is similar] c2 (threatening 35Qa3# or 35cxd1=Q+)

Black will be up N+P.

White can decline the sacrifice (best):

(2) 32.Qf2 Rxb3+ 33.Ka1 [Kc2 Rb2+ wins the White Q]

33Rf3 34.Q any b3 (threatening 35Qxa2+)

Black will be up at least R for B.

(3) Other Q moves seem less clear, but 33Rxb3+ wins a P, and White is denied the aggressive Qf3-f6.

Jul-09-10  David2009: <ZUGZWANG67: <David2009: Does anyone know what should happen after 31...f6?> [snip] What about 32.Rxd6!?[snip]> Thanks for this excellent suggestion! I have input the position into Crafty. Your analysis continues 32 Rxd6 Nxd6 33.Rxd6 Rxd6 34.gxf6+ and now Crafty diverges with 34...Rfxf6 35.Bxe5 Rc6 to give:


click for larger view

Black is (temporarily) the double exchange ahead and looks comfortable, but the position is far from won. As a winning attempt 31 g6 must rank well below 31...Rc3

<I'll give an other post with what ChessPartner has to say about it.> It would be interesting to see the outcome of Chess Partner vs Crafty. Crafty link to the position after 31...g6 if you want to investigate further: http://www.chessvideos.tv/endgame-t... You are white, drag and drop the move you want to make.

Jul-09-10
Premium Chessgames Member
  chrisowen: <Patriot> Congratulations good caddying for win the scholarship in the hole and shack up with everyone just dont go pheromone crazy alright? I never win a sausage it take the biscuit quadrupled you wow factor overnight especially with James Bond who's looking a tad orange. A prize well deserved good endeavour!
Jul-09-10  wals: White's Blunder.

31.Bg3 -1.75.
Better R5d2, R1d2, Be1 all 0.00,
R1d3 +0.08, or Rc1 -0.04.

courtesy of Rybka 3 1-cpu: 3071mb hash: depth 18:

Jul-09-10  jheiner: Missed it today but rushing. I took the Rc2 line which I believed gave chances or at least a draw.

31...Rc2 threatening mate on a2 or b2
32.Kxc2 Qxa2+
33.Kd3 [Kc1 draws by perpetual] Qxb3+
34.Ke2 Qd4+
35.Qe3 (not forced but one of the major pieces gets pinned.) b3

Now I thought Black was looking at either a draw or paired passed pawns on the sixth rank (equal to a R). Not good enough.

I did this one really quickly today. No proper analysis but rushed through it and then checked the answer. I did look at the Rc3 line briefly, but missed the power of the Pc3.

Jul-09-10  BOSTER: I guess untill move 31.Bg3? white position in spite of naked king, open "a" and "c" files and dangerous black queen on a3 at least is equal. I try to explain. Black king is open too, and knight on e8 and black rook f8 need time to come into play, pawn b5 is hanging,pawn on b4 need protection. <Jim> could you analyse this position after 31.Be1, or 31. Rxd6,if you have time.
Jul-09-10  YouRang: <David2009: <ZUGZWANG67: <David2009: Does anyone know what should happen after 31...f6?> [snip] What about 32.Rxd6!?[snip]> Thanks for this excellent suggestion! I have input the position into Crafty. Your analysis continues 32 Rxd6 Nxd6 33.Rxd6 Rxd6 34.gxf6+ and now Crafty diverges with 34...Rfxf6 35.Bxe5 Rc6 to give: ...>

I'm curious about how you arrived at <33.Rxd6> in this line?

My computer much prefers <33.gxf6+ Rxf6 34.Bxe5>.

Jul-09-10  YouRang: <jheiner: Missed it today but rushing. I took the Rc2 line which I believed gave chances or at least a draw. 31...Rc2 threatening mate on a2 or b2
32.Kxc2 Qxa2+
33.Kd3 [Kc1 draws by perpetual] Qxb3+ >

Are you sure about the <[Kc1 draws by perpetual]> part?

Jul-09-10  ZUGZWANG67: <<David2009>: "It would be interesting to see the outcome of Chess Partner vs Crafty.">

Thank you, David. In fact, I considered 34...Rfxf6 but thought wrongly it was a losong move when in fact, it keeps the possibility of shifting the R to c3 wide opened. About ChessPartner vs Crafty, ChessPartner agrees with the line you gave.


click for larger view

But the resulting position has "some of the features" of a perpetual check as a salvation for W: 36.Bxf6+ Rxf6 37.Qg4+.


click for larger view

After that, I think that B could not prevent both perpetual AND forks against his K and R.

Jul-09-10  ZUGZWANG67: <<YouRang>: I'm curious about how you arrived at <33.Rxd6> in this line?

My computer much prefers <33.gxf6+ Rxf6 34.Bxe5>.>

In fact, the line your comnputer gave is much better.

I omitted to consider it when ChessPartner was "sticking" to it because it was stall at 9 ply. I then decided that for the purpose of the analysis, which was to demonstrate that 31...f6 wasn't enough for a win, I would keep working with 33.Rxd6, secure in my opinion that W had a perpetual as a saving ressource. Sorry for this lack of rigor in my approach.

Peace!

Jul-09-10
Premium Chessgames Member
  Jimfromprovidence: <BOSTER> <wals> recently posted Rybka analysis of the position at move 31 for white.

<David2009> Your 31...f6 is a great line to put out there to chew on. Rybka freeware likes 32 Rxd6 Rxd6 33 Rxd6 Nxd6 34 gxf6+ Rxf6 35 Bxe5, with the advantage going to white after that forking move.


click for larger view

In fact, concern about the bishop fork possibility in the puzzle position has bothered me all along (not knowing if black has a winning position even with a material advantage).

Last night I liked 31...Rc3 32 Qg2 Rxb3+ 33 Ka1 as good play for both sides.


click for larger view

Even though black is up two pawns his f rook is trapped; his b5 pawn is vulnerable and white has the threat of Rxd6, seeing the forking continuation Nxd6 Bxe5+. How to deal with that forking possibility determines if black wins or not.

Jul-09-10  wals: after 31...f6.

Analysis by Rybka 3 1-cpu: 3071mb hash: depth 18 : time 1 hour and way from being complete with this engine.

1. (0.32): 32.Rxd6 Rxd6[] 33.Rxd6[] Nxd6 34.gxf6+[] Rxf6 35.Bxe5[] Nxe4 36.Qxe4 Qxb3+[] 37.Ka1 Qe6 38.Nxb4 Kg8 39.Qg2+ Rg6 40.Qa8+ Kf7 41.Qb7+ Kf8 42.Qb8+ Qe8 43.Bd6+ Kf7 44.Qb7+ Kg8 45.Qd5+ Qf7 46.Qa8+ Kg7 47.Be5+

2. = (0.00): 32.Rc1 fxg5 33.Qd3 Ra6 34.Rc2[]

3. = (-0.11): 32.gxf6+ Rxf6[]

4. = (-0.11): 32.R5d3 Kg8

5. = (-0.13): 32.R1d2 fxg5

Jul-10-10  jheiner: <YouRang: Are you sure about the <[Kc1 draws by perpetual]> part?>

Sorry I wasn't clear there. What I meant is that Qa2+ Kc1 Qa1+ Kc2 Qa2+ is a draw by repetition if White does not want to take the Kd3 line.

In other words, the Kd3 is "forced" and leaves the position with Black with a B and 2P for a R. Likely one R will be traded off, leaving White with Q+B+R vs. Q+B+N+2 passed P.

At least, that's the story I told myself as I was rushing this one.

Jul-10-10
Premium Chessgames Member
  johnlspouge: Hi, <jheiner>.

Toga generally agrees with your analysis that White is winning. (Humans can improve near the end of the complete computer variation.)

[ply 22/91 time 7:43:01 value +2.39]

32.Kxc2 Qxa2+ 33.Kc1 Bc7 34.Rd7 Kg8 35.Bf2 Qa1+ 36.Kd2 Qa6

37.Bc5 Qc6 38.Rd5 Bd6 39.Bxd6 Nxd6 40.Rc1 Qb6 41.Ke2 Ne8

42.Rxe5 Ng7 43.Rd5 Re8 44.h4 Ne6 45.Qf6

Jul-10-10  YouRang: <jheiner><<YouRang: Are you sure about the <[Kc1 draws by perpetual]> part?> Sorry I wasn't clear there. What I meant is that Qa2+ Kc1 Qa1+ Kc2 Qa2+ is a draw by repetition if White does not want to take the Kd3 line.>

But after <31...Rc2 32.Kxc2 Qxa2+ 33.Kc1 Qa1+>, why not <34.Kd2>, heading for e1, solidly up the exchange? It seems that 33.Kc1 is white's best move.

Jul-11-10
Premium Chessgames Member
  patzer2: For the Friday July 10, 2010 puzzle, 31...Rc3!! sets up a surprise winning zwischenzug or in-between move after 32. Nxc3 Qxb3+!
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