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Maia Chiburdanidze vs Semen Isaakovich Dvoirys
URS-ch48 sf (1980), Tallinn, Aug-??
Sicilian Defense: Najdorf Variation (B96)  ·  1-0

ANALYSIS [x]

FEN COPIED

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sac: 12.Nd5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Aug-27-11  gofer: Black can create a mating threat immediately, by playing 22 Rxe7 ... 23 Qxf6 ... 24 Qxf7#. So I don't think black can refuse the sacrifice (i.e. 22 Rxe7 Kg8 23 Qxf6 Rf8 24 Rxd5 h6 25 Bg4 winning).

<22 Rxe7 Kxe7>
<23 Re1+ ...>

23 ... Kd8 24 Qxf6#
23 ... Kd6 24 Qxf6+ Ne6 25 Rxe6+/Qxe6+ fxe6 26 Qxe6#/Rxe6# 23 ... Kf8 24 Qxf6 Kg8 (Ne6 25 Qxh8+ Ke7 26 Rxe6+! mating)25 Re7 Rf8 26 Bg4 winning

<23 ... Ne6>

24 Rxe6+! fxe6 25 Qg7+ Kd6 26 Qxf6 Qxd7! 27 cxd7 Rhf8 28 Qe5+ Kxd7 29 g4 seems to be okay for white, but the following looks better...

<24 f5! ...>

Now the rest is just conjecture, but it could be...

<24 ... Rag8>
<25 fxe6 Rg6>
<26 Qe3 Kf8>
<27 exf7 Kg7>
<28 g6!? Rf8>
<29 Be8 Rxf7>
<30 Bxf7 Qxf7>
<31 Qc4 winning>

Time to check...

Aug-27-11  sevenseaman: <David2009> You nailed it today. Taming the Crafty will take some more slogging, I think.
Aug-27-11  KingV93: I went with 22.♖xe7 ♔xe7 23.♕xg7 missing 23...♕xf4+ 24.♔b1 ♕xb4+ which covers the e1 square and prevents the key Re1+, Allllmost!.....But NO!
Aug-27-11  JohnBoy: My difficulty with the puzzle was how to handle 23...Ne6 - which <gofer> discusses above. It seems to me that the right way is not with 24.Rxe6+ but rather 24.Bxe6. I see 24...fe6 25.Qg7+ Kd6 26.Rxe6+ Kxe6 27.Qxc7 - but this in not a closed case. Curious what the engines say.
Aug-27-11  KingV93: After 12.♘d5 why not 12...♕xd4 I can see some variations where Black can lose the Queen to an eventual ♗b5+ discovered attack but still ends up with 3 minor pieces for the Queen. What is the crucial flaw with 12...♕xd4? I have a sneaky suspicion it's obvious but I cannot see it.
Aug-27-11
Premium Chessgames Member
  FSR: Took me a few minutes to realize that after 22.Rxe7! Kxe7 23.Re1+! Black is crushed. The only remaining question of any interest is what the best response to 23...Ne6! is. Perhaps 24.Rxe6+! fxe6 25.Qg7+ Kd6 26.Qxf6.
Aug-27-11  SimonWebbsTiger: @<KingV93>

it sometimes helps to look at earlier posts; I wrote about 12. Nd5 Qxd4 earlier today. :o)

Aug-27-11  gofer: <morfishine: 22.Rxe7 Kxe7 23.Re1+ Kf8 24.Qxf6 Qd8>

I think this quickly exchanges into a losing endgame for black.

<25 Qxd8 Rxd8>
<26 c7 Ra8>
<27 c8=Q+ Rxc8>
<28 Bxc8 ...>


click for larger view

Black's pawns are so weak and white's are so strong that by the time black gets co-ordinated, it is going to be very one-sided...

Aug-27-11  abuzic: <22.Rxe7 Kxe7 23.Re1+ Ne6>

24.Bxe6 Qd6 (24...fxe6 25.Qg7+ Kd6 26.Rxe6+ Kxe6 27.Qxc7) 25.Bxd5+ Kd8 26.Bxf7; 26.Re6 is also playable 26...fxe6 27.Qxf6+ Ke8 28.Bxe6 Qxc6 29.Qe5 Kd8 30.Bd5 (30.Qxh8+ Kh7 and black can still fight) Qe8 31.Qd6+ Kc8 32.Bxa8.

24.Rxe6 gets white nowhere after 24... fxe6 25.Qg7+ Kd6 26.Qxf6 Qd8 (26...Qb8 is also playable) 27.Qe5+ (27.Qxe6+ Kc7 28.Qe5+ Kb6 29.Qd4+ Kc7 white has to give checks or black may get better position) 27...Ke7 28.Qxe6+ (28.Qg5+? Kf7!) Kf8 29.c7 Qe7 30.c8Q Rxc8 31.Bxc8.

Aug-27-11
Premium Chessgames Member
  kevin86: I looked for the sacs at g7 and e7. E7 looked best.

The ending is lost after white regains the queen.

Aug-27-11  morfishine: <gofer> Great, then Black loses in both lines. Somewhat of a relief. Thanks for looking!

BTW: I played thru <David2009>'s "Crafty" and achieved Q+3 pawns vs 2 rooks, which I figured wins for white.

Aug-27-11  karnak64: Wow. Look at White's 12th and 13th moves. Crazy stuff.
Aug-27-11
Premium Chessgames Member
  DarthStapler: I got the first 3 moves
Aug-27-11  Vladimir Zukhar: 24...Q-Q1 improves for B altho B is still lost as the 2 Black Q-side P will go lost.

still, its a lost endgame vs. imediate resignation. in a game with amateurs/club players level, there would be hope for draw, but not with GM

Aug-27-11
Premium Chessgames Member
  Jimfromprovidence: I never even considered the text 23...Kf8, because the text 24 Qxf6 looks so good for white. (seeing 25 Re7,etc.)

The puzzle got too profound for me after 23...Ne6.

I did not consider 23....Ne6 24 f5!?, either, although I am curious what happens after 24...Qa7?!, (threatening 25...Qf2, attacking both the rook and the f pawn, or 25...Qd4, threatening 26...Qxb4)


click for larger view

Aug-27-11  Yodaman: I usually don't get "very difficult" rated problems but I got this one in about three minutes all the way all the way to move 27.QxQ just by looking at the puzzle position on the homepage. Something about the puzzle was very intuitive to me that made it easier than what "very difficult" puzzles usually are for me.
Aug-27-11
Premium Chessgames Member
  patzer2: <gofer:> <morfishine: 22.Rxe7 Kxe7 23.Re1+ Kf8 24.Qxf6 Qd8>

<I think this quickly exchanges into a losing endgame for black.>

<25 Qxd8 Rxd8>
<26 c7 Ra8>
<27 c8=Q+ Rxc8>
<28 Bxc8 ...>

Even stronger is 24...Qd8 25. Qd6+ Kg1
26. c7! Qf8 27. Qxd5 (diagram below)


click for larger view

From here, play might continue 27...h5
28. Qxa8 Qxa8 29. c8Q+ QxQ 30. BxQ (diagram below)


click for larger view

Here Black is better with two extra pawns, instead of just one, than after the 25. Qxd8+ Rxd8 26. c7 Ra8 27. C8Q+ Rxc8 28. Bxc8 continuation.

Aug-27-11  standardwisdom: It appears that the Bishop on d7 is so strong, that 19..Ng7 has got to be a mistake. Perhaps 19..Nf8 holds better? But it seems, not 19..Kf8, which can lead to problems after a rook lift.
Aug-27-11  goodevans: <Jimfromprovidence: ... I did not consider 23....Ne6 24 f5!?, either, although I am curious what happens after 24...Qa7?!>

At first I thought <24 f5> would be the right way to answer <23 ... Ne6>, but now I'm inclined to go with <24 Bxe6> as analysed by <abuzic>.

After <23 ... Ne6 24 f5> black has <24 ... Rag8> intending either Rg5/Qf4+ or Rg4/Re4. Whatever white does, black seems to get good counterplay so it seems 24 f5 is too slow.

Aug-27-11  David2009: Chiburdanidze vs Dvoirys, 1980 postscript: In the line 22.Rxe7 Kxe7 23.Re1+ Kf8 24.Qxf6 Kg8 25.Re7 Rf8 26.Be6 Qxe7 27.Qxe7 Nxe6! 28.f5 Kg7 29.fxe6 Kg6 we reach


click for larger view

with Crafty End Game Trainer link http://www.chessvideos.tv/endgame-t... Thanks to <SimonWebbsTiger> for suggesting the fine resource 30 c7! (numbering typo corrected) which does indeed crack Crafty EGT :) . After 30.c7 fxe6 31.Qxe6+ Kg7 32.Qxa6 Rc8 33.Qxb5 Rxc7 34.Qxd5 Rhc8 35.Qe5+ Kg6 36.Qe4+ Kf6 37.Kb2 Rc4 38.Qf3+ Ke5 39.Qb3 Rf4 40.Qe3+ Re4 41.Qg5+ Kd6 42.a3 Rce8 43.Qh6+ R8e6 44.Qxh7 Re2 we reach


click for larger view

and there must be many ways of winning this ending. Crafty EGT link to explore this final position: http://www.chessvideos.tv/endgame-t....

Thanks also to <sevenseaman> for the friendly comment - I have to confess that the first time I reached the second diagram I only managed a draw. I gave up my K side Pawns to push the Q side Pawns: this works except that I pushed the b Pawn too quickly allowing the snap exchange of RR for Q+P on c2 woth a draw since the b Pawn was too far forward. We live and learn - I had no problems winning second time round.

Aug-27-11  morfishine: <patzer2> Thanks patzer2! I feel even better than before. Frankly, I was satisfied to make it thru <24.Qxf6> just on a sound positional basis

<David2009> On <I have to confess that the first time I reached the second diagram I only managed a draw. I gave up my K side Pawns to push the Q side Pawns: this works except that I pushed the b Pawn too quickly allowing the snap exchange of RR for Q+P on c2 woth a draw since the b Pawn was too far forward. We live and learn - I had no problems winning second time round> I followed virtually the identical road against CRAFTY

<sevenseaman> Great poem or verse the other day and good insight to today's puzzle

Aug-27-11  stst: W K is quite locked in, the N is pinned, with g7 the weakest link. Also the W PB pair forms a duo hard to break for B (without unnecessary sac.) May just try the quiet Re3 planning for g3 aiming Qxg7, if Bk B attempts to loosen up, say Bd6, double up Rde1 and Bk has no more good defense - pulling its Q to d8 may guard e8, but not g7. Thus: 22.Re3 Bd6
23.Rde1 Qd8
24.Rg3 Rg8
25.Re8+ QxR
26.BxQ KxB
27.Re3+ Kd8
28.Qf6+ Kc8
29.Qxf7 Rf8
30.Qd7+ Kb8
31.Qb7#
see if the lady champ got other ideas...
Aug-27-11  stst: yeah, the lady champ really tries a direct R sac, which I also thought about of course, but it does not lead to a clean slate, as the game shows, after KxQ, W queens its P, but a win is not imminent; though material adv. is definitely there (Q + promotional Ps vs R & N for Bk.)
Aug-27-11  gofer: < David2009: Chiburdanidze vs Dvoirys, 1980 postscript: In the line 22.Rxe7 Kxe7 23.Re1+ Kf8 24.Qxf6 Kg8 25.Re7 Rf8 26.Be6 Qxe7 27.Qxe7 Nxe6! 28.f5 Kg7 29.fxe6 Kg6 we reach>

<30 c7 fxe6>
<31 Qxe6+ Kg7>
<32 Qxd5 Rc8>
<33 Qd7+ Kg6>


click for larger view

Black is deader than dead. The black rooks are tied to the back rank and the black king is tied to the king side).

Crafty EGT can't resist a free pawn, so <34 a4 bxa4> gives the white king complete freedom to come to b7 after taking Pa4 and "That's All Folks!"... ...okay it will take a while but black can resign as there is absolutely no counter-play on offer!

Aug-27-11  rhickma4: The first move seems obviuos, but the eventual attcak less clear.

22.Rxe7 Kxe7 23.Re1+ Ne6 24.Bxe6 fxe6 25.Qg7+ Kd6 26.Rxe6+ Kxe6 27.Qxc7 Rad8

Black has 2 R for the Q,but White can continue the attack

28.g4 f5 29.Qe5+ Kf7 30.Qxf5 Kg7
I think this final position is one for White

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