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Giorgi Giorgadze vs Xu Jun
Olympiad (1996), Yerevan ARM, rd 8, Sep-24
Sicilian Defense: Grand Prix Attack (B23)  ·  1-0
ANALYSIS [x]

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sac: 36.Nxg6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Dec-13-08
Premium Chessgames Member
  chrisowen: Does black have any defence for 35.g6? Looks like he gets hammered on the g/h files if the g pawn is not recaptured. It seems then that g6 flushing the f file for a pawn fork wins.
Dec-13-08
Premium Chessgames Member
  whiteshark: 35.g6 with the idea of <35...hxg6 36.Nxg6 fxg6 37.f7+ Kg7 38.fxe8=Q Bxe8> and no I think that <39.e5!> is a fine move to activate Bg2, threat exd6 and to block the long diagonal. I'm not sure if it's winning though.
Dec-13-08  alphee: I don't think this one was too hard to find, g6 to open the files and attacking the king being the only attractive option. To be honest I was quite surprised when I saw the solution! For me the first question was "will black capture from the "f" or the "h" file and by the end I got it until 38 ... ♗xe8. Then I missed Qg5 and tried 39.♕f4 ♔h7 40.♕xf8 ♕a7 etc without any real success even if Black seems to be in a bad position. As I don't think I am getting really better it might be luck.
Dec-13-08  zanshin: <TomOhio: Why did Black resign when he did? Doesn't 41... Bf7 work here??>

<Ladolcevita> is correct. I checked this with an engine. The most likely line is 41...Bf7 42.Bh3 Qe5 43.Qd7 Kh6 44.Qxf7

Dec-13-08  Ian McGarrett: TomOhio, in response to Bf7, white's queen will pin the bishop and black will be unable to defend it.
Dec-13-08
Premium Chessgames Member
  DarthStapler: I got it (well most of the lines)
Dec-13-08
Premium Chessgames Member
  johnlspouge: < <whiteshark> wrote: [snip] I think <39.e5!> is a fine move to activate Bg2, threat exd6 and to block the long diagonal. I'm not sure if it's winning though. >

Toga declares it a loss (-1.5 P for White), because Black can eat Pc2 and hold everything together.

Dec-13-08
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult)

G Giorgadze vs Xu Jun, 1996 (35.?)

White to play and win.

Material: N for B+P. The Black Kg8 has 1 legal move, to the dark square h8. The Black K-position has weak dark squares covered by Bf8 and accessible to the White Nf4 after 1 move. The White Rf1 backs the spearhead Pf6, with Nf4 obscuring, suggesting a clearance combination. The White Qe3 and Bg2 require activation. White has a huge spatial advantage on the K-side, but his local superiority is blocked by Pg5, again suggesting clearance. The White Kg1 is secure, although the Black Qa2 threatens a Q-side breakthrough with Qxc2.

Candidates (35.): g6

35.g6, threatening 36.gxf7+ Kxf7 37.Qf3, with the further threat of

(A) 38.Qxh5+ Kg8 40.f7+ Kh8 [Kg7 41.Qg5+ Kh8 42.Qg8#]

41.Qg5 (threatening 42.Qg8#)

41Bg7 42.Ng6+ hxg6 43.Qh4+ Bh6 44.Qxh6#

In this threat, Black cannot play

37Kxf6 38.Nd5+ (threatening 39.Qf6+ or 39.Qf7+ 40.Nf6)

The threatened attack does not permit refusal, so Black must accept the P sacrifice, in one of 2 ways:

(1) 35fxg6 36.Nxg6 (threatening, e.g., 37.f7+ 38.fxe8=Q 39.Nxf8)

The threatened attack wins material, so Black must accept the sacrifice of Ng6. The acceptance is confluent with Variation 2, next.

(2) 35hxg6 36.Nxg6 (threatening 37.Ne7+ 38.Qg5+)

Again, the threats are too strong, so Black must accept Ng6, confluent with Variation 1:

36fxg6 37.f7+ Kg7 [Kh8 38.fxe8=Q Bxe8 39.Rxf8+ Kg7 40.Rxe8]

38.fxe8=Q Bxe8 39.Qg5 (threatening 40.Qf6+ winning Bf8)

39Kg8 40.Qf6 Bg7 41.Qxe6+

The Black K-position has collapsed.

I omitted the defense 39Qb2.

Dec-13-08
Premium Chessgames Member
  al wazir: I saw the moves played through 39. Qg5, but not the continuation 39...Qb2 40. Qd8. Still, I would have played this OTB. White gets a ♖ for ♗+♙+♙ with an attack, and I think I would have found the winning line.
Dec-13-08  mindmaster: The problem with me is I find the best move but think there must be another which still better and look out for that wasting time....I spotted the first move but could not continue after that...
Dec-13-08
Premium Chessgames Member
  johnlspouge: < <mindmaster> wrote: [snip] I find the best move but think there must be another which still better and look out for that wasting time >

Intuition requires experience. At the beginning, the primary rule is focus on forcing moves - to win, you must threaten your opponent with something - and if you can not make a candidate move work, switch.

Dec-13-08  Woody Wood Pusher: Missed it again!?

I thought 35.Qh3

I'm having a really bad week...

:-{

Dec-13-08
Premium Chessgames Member
  Jimfromprovidence: There's a nice combination that leads to a queen trap if black does not capture the g pawn and tries 35...Kh8? instead.


click for larger view

36 g7+ Bxg7 37 fxg7+ Kxg7 38 Nxh5+ Kf8 39 Qh6+ Ke7 40 Qf6+ Kd7 41 Ra1!


click for larger view

Dec-13-08
Premium Chessgames Member
  patzer2: For a real challenge in analyzing this game, try and figure out where Black last went wrong and where he could improve.

On the surface, the losing move appears to be 33...Qa2? as White has practically a forced win after 34. h5! gxh5 (forced) and the game continuation 35. g6!!

Perhaps Black can organize a defense and hold off White's attack with 33...Ra8, 33...Rb8 or 33...e5. Preliminary computer (Fritz) evaluations show these moves equalizing around 14-ply. However, as I slide forward and examine these lines, the evaluations are not so clear and tend to improve for White to near decisive results.

Can Black hold with any 33rd (33...?) move alternative? Or does Black have to make improvements earlier in the game to survive?

Dec-13-08  cydmd: <Jimfromprovidence>, I didn't see the queen trap !!! Although Black is lost, what about 41... Qxc2 ?
Dec-13-08
Premium Chessgames Member
  Jimfromprovidence: <cydmd> <I didn't see the queen trap !!! Although Black is lost, what about 41... Qxc2 ?>

If black does not exchange queen for rook, Rybka v2.2n2.mp.w32 says it's a forced mate in 10, beginning with 42. Qxf7+.


click for larger view

After 42...Re7 43 Nf6+ Kc6 44 Qxe7, etc.

Dec-13-08  BoBBY FISCHEr: I think it would be better with 35.d4,cxd4; 36.Qf3,Bxf1; 37.Bxf1,Qxc2; and 38.g6 now the white wins easilly.
Dec-13-08
Premium Chessgames Member
  johnlspouge: < <BoBBY FISCHEr> wrote: I think it would be better with 35.d4 [snip] now the white wins easilly. >

According to the Toga engine, 36...Bxf1 and White loses (worse than -4.0 P), because Rf1 is not behind his Pf6 any more. My chessforum contains detailed instructions on how to download Toga, which is freeware.

Dec-13-08  njchess: I got this one quicker than Friday's puzzle. g6 was my primary candidate move, and after exploring it, I didn't pursue any others. My sequence went as far as Qd8 where I determined that Black would lose too much material for virtually no counterplay.
Dec-13-08  jovack: Got this one in about 10 second's time.
Dec-13-08  octoberowl: <<newzild: ... I think it's relatively easy for a Saturday because there's only a very few ways to open lines against the black king.> Thats where I went wrong. As far as I can see the h-file is so weak and black defences so cut off that white could easily swing his queen and rook to the h-file and there would be little black could do about it. I spent quite a while convincing myself of this but couldnt find a particularly neat move order, at which point I gave up.> Yes, I was also on this strange pass and totally missed the obvious pawn push here!
Dec-13-08  griga262: Does it count if I got it through move 38? I really didn't even look any further and went to check because I've never solved a Saturday puzzle before...
Dec-13-08
Premium Chessgames Member
  Gilmoy: <TomOhio: why not 36..Bg7 37.fxg7 Kxg7> 38.Qf2 wins. 38..Qa7 39.Qf6+ keeps the extra piece, 38..Kxg6 39.Qxf7+ mates swiftly, and 38..fxg6 39.Qf7+ traps the K for mate: 39..Kh6 40.Rf6 (Black can't defend g6) Qa1+ 41.Bf1 Qd4+ 42.Kg2 no perpetual, or 39..Kh8 40.Qxg6 Qb2 (to get onto the perpetual-diagonal) 41.Rf7 Qc1+ but White runs to h3.
Dec-13-08  TheBish: There only seems to be one plan of action here: 35. g6! (threatening 36. g7) hxg6 (or 35...fxg6 36. f7+ Kxf7 37. Nxh5+ Ke7 38. Qg5+ Ke8 39. Nf6+) 36. Nxg6 (threatening 37. Nxf8 and 38. Qh6) fxg6 37. f7+, winning the exchange.
Dec-21-08
Premium Chessgames Member
  whiteshark: <johnlspouge: ... <Toga declares it a loss (-1.5 P for White), because Black can eat Pc2 and hold everything together.>>

After <39.e5 Qxc2??>


click for larger view

black is lost, e.g. <40.Qf3 Be7 41.Qb7 Qxd3 42.Qxe7+ Kh6 43.Qf8+ Kh7 44.Qxe8> with ♖♗ : ♙♙♙♙ material surplus for white.

This isn't Toga's winning line, is it?

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