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Iossif Dorfman vs Viktor Kupreichik
URS (1980)
King's Indian Defense: Orthodox Variation. Korchnoi Attack (E97)  ·  0-1



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Given 16 times; par: 30 [what's this?]

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sac: 22...Nxg3 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-24-07  Sololoy: Can someone tell me why white didn't play 12.g4?
Feb-24-07  Skylark: Wow, from really easy to very vague.. I started looking at Ng4 lines but realised it was blocking off the queen, then noted Nxg3 which opened lines for the queen and prepares an attack - still, I could not find a definitive winning line.. Meh, CG does as it sees fit, and I'm sure they were just paying us back for complaining about the puzzles ;)
Feb-24-07  chessmoron: <<Sololoy>: Can someone tell me why white didn't play 12.g4?> 12...Nd4! and white is lost.

<<Moondoll>: Ok, I see the ending now. 30.Kg2 Rh2+ 31.Kf1 (Kg3 Bb4+ Kf3 Rf2#) Rf8+ 32.Bf3 (Kg1 Be3#) Rxf3+ 33.Kg1 Rg3+ 34.Kf1 Rf2#. Very nice.> OR 30. Kg1 Be3+ 31. g2 Rh2+ 31. Kg3 Bf4+ 32. Kf3 Rf2#

Feb-24-07  Fisheremon: <Sololoy: Can someone tell me why white didn't play 12.g4?> 12...Nd4 13.gxh5? Nxe2+ 13.Nxe2 Rxf3 14.h6 Bf8 15.Ng3 Bg4 with next Qh4-h3, Be7, Raf8 etc. Black's attack is irresistible.
Feb-24-07  calmarten: <fisheremon> white can't talke the N after g4 or at least it doesn't look best 12...,Nd4 13.Nxd4(to defend g4), exd 14.Ne4(transfer to g3 trying to defend h2 from Qh4 followed by Be5) anyway it looks really bad for white black has all the play and white gets nothing that I see in return for the weakness. I'm quite tired so maybe there is still something crushing for black that I'm misseing.
Feb-24-07  builttospill: I predicted correctly up to 25. Qg2 but then I had trouble figuring out how to continue. I suppose Qh5 threatens Rf2 and if white responds with Rf1 there's the threat of Rf8 followed by Ne3, so Qh1 is a logical choice. It just so happens that the game is lost either way.
Feb-24-07  TheHurricane3: After a depth of 17 Rybka 2.2's Analysis says Ng4! was best. -1.22
Feb-24-07  mig55: After 26. Bf1 there is still life, after Be2 it is mate in 6...
Feb-24-07  mig55: Simply 22.../a6 wins too...
Feb-24-07  Gilmoy: What is White doing? Is this book?

8 d5 closes the center, not to White's space advantage -- Black was going to break out on f regardless, White throws away his center counterplay.

12 g4 would have forked a Knight. White feared exposing holes around his King? But without this, White's 11 exf5 has only made Black stronger, by ceding f.

13 .. Bh6 14 Bc3?? Unbelievable -- White cedes the diagonal, and mothballs his own Bishop.

15 Re1? abandons f! Did White plan f4? Or Nf1-e3? White has momentary congestion approaching gridlock, no pressure on Black, no axis for counterplay.

Meanwhile, Black's development rolls smoothly: 16 .. Bf5 17 .. Qd7 clears back rank 19 .. Rf7 and the inevitable doubling on f. Now Rf1 just wastes two tempi, so White stays the course. 17 c5 18 cxd6 is a paper dragon -- White dreams of maybe tripling on d6 with Nc4 Bb4.

19 f3? Consistent with his "theme" of ceding f -- he'll "save" this pawn not by protecting it, but by having it sidestep.

20 Nc4 Bxe4 smoothly nips the threat to d6. 21 fxe4 and now Black sees that his Queen will soon sortie, but he needs his Rook unmolested at f7, hence he must chase the Knight: 21 .. b5 22 N(any -- a3, ok) The b-pawn needs no further protection, as White is out of time.

We arrive at the puzzle position. White has no defenders in the box around his King, a hole at h3, and Black (will) own f. Recall White's gridlock -- none of his pieces can (safely) protect g3. 22 .. Qh3? 23 Bf1 too hasty.

Examine the moves that smite! 22 .. Nxg3 and now 23 ... Qh3 is a deadly deep-fork: g3 and Ng4. 24 Qe2 Qxg3+ 25 Qg2 Qxd3 26 Rad1 looks dicey, but 26 .. Be3+ and:

27 Kh2 Bf5+ 28 .. Qg3
27 Kh1 Qxe4 28 Qxe4 Nxe4 and White has no time to take the Bishop: 29 Rxe3? Nf2+ and Black is up an exchange + 3 pawns.

So, 24 Qf3[] Ng4 and White's King is trapped in a bowling alley, while his Queen fights alone vs. a 4-piece attack (not even counting Raf8). 25 Qg2[] Qh5 (threatening 26 .. Rf2) 26 Qh1 Rf3 "zwickenfork" :) with check, as Black's Queen is protected.

29 Be2?? Rh3+ is a mating net featuring the gift square e3, e.g. 30 Kg1 Be3+ 31 Kf1 Rf8+ 32 Kg2 Rh2+ 33 Kg3 Bf4+ 34 Kf3 Rf2#

30 Kg2 Rh2+ transposing to the above.

<Aspirador: Better for white seems 26.Re2, but black still has an attack after 26...Raf8.>

26 Re2 cuts the Bishop from f1 -- more gridlock.
26 .. Raf8 27 Nxb5 Ne3 forks the Queen and mate at f1: 28 Q(h1,h2) Rf1+ 29 Rxf1 Rxf1#. Or 28 Rxe3 Bxe3+ winning.

Hence, White must defend e3 twice: 27 Rae1 a6! leaves White's Knight and KB with no prospects. Black's threat is a different fork 28 .. Nf2 29 Bc2 Nh3+ K(h1,h2) 30 Rf2 winning the Queen (either trapped or pinned). Can White answer that in 1 move (his 28th)?

Feb-24-07  percyblakeney: I had 22. ... b4 23. Bxb4 a5 to open the a7-g1 diagonal. It looks as if Ng4 in the next move would be tricky to defend against.
Feb-24-07  scholes: rybka winfinder likes simple a6

click for larger view


10 00:05 218.994 39.641 +0.75 22. ... a7a6 23.Re1f1 Bh6e3+ 24.Kg1g2 Ra8f8 25.Qd1e2 Be3b6

11 00:12 499.273 41.731 +1.03 22. ... a7a6 23.Re1f1 Bh6e3+ 24.Kg1g2 Be3c5 25.Na3c2 Ra8f8 26.Bc3b4

after night takes g3 its evaluation drops to


click for larger view


13 00:21 901.158 42.577 +0.14 23.h2xg3 Qd7h3 24.Qd1f3 Nf6xd5 25.Qf3g2 Bh6e3+ 26.Re1xe3 Qh3xg2+ 27.Kg1xg2 Nd5xe3+ 28.Kg2h3 a7a6 29.Bc3d2 Rf7f3

14 00:55 2.379.941 43.664 +0.07 23.h2xg3 Nf6xd5 24.e4xd5 Qd7h3 25.Qd1e2 Qh3xg3+ 26.Qe2g2 Qg3xd3 27.Ra1d1 Bh6e3+ 28.Kg1h1 Qd3f5 29.Na3xb5

it wants to sac a second night.white's qh1 and bd3e2 were blunders that cost the game not this nxg3

Feb-24-07  Marmot PFL: Not too difficult for anyone who plays either side of the King's Indian. White's kingside has been weakened (g3) and his pieces (esp. Na3) are too badly coordinated to help the king.
Feb-24-07  Fisheremon: White's position after 22.Na3? was so bad that there are several ways to win, e.g. 22...a6, or 22...Ng4, but 22...Nxg3! belongs to the sort of "intuitive" sacs. Let's take the position after 22.Ne3 (instead 22.Na3), then 22...Raf8 23.Bd2 Bxe3+ 24.Bxe3 Nxg3! the only winning move.
Feb-24-07  TrueBlue: lol got it. Only difference is that I considered lines where white doesn't take the pawn back. Something like this. Most lines I could fine black came the advantage.

22. .. Nxg3 23. Bxb5 Qh3 24. Qd3 Nfh5 25. Qc2 Nf4 26. Nc4 Nfe2+ 27. Qxe2 Nxe2+ 28. Rxe2

Feb-24-07  outplayer: I've seen it in a few seconds.
Premium Chessgames Member
  kevin86: I can answer a lot of the weekday puzzles,but on Saturday and Sunday,I have to yield to the great masters.
Feb-24-07  Ingolf: I had 23.- b4 like <percyblakeney>. Black gets a dangerous attack at the cost of one pawn. One possible line (not engine tested): 24.Bxb4 a5 25.Bd2 Ng4 26.Re2 (26.Bxh6 Qa7+ 27.Be3 Nxe3 should win an exchange for black) Qa7+ 27.Kg2 Rf2+ 28.Kh1 Rxh2+ 29.Rxh2 Nf2+ 30.Rxf2 Qxf2 and the threat Nxg3 decides.
Feb-24-07  Ingolf: An additional line: 23.- b4 24.Bxb4 a5 25.Bd2 Ng4 26.Nb5 (to cover a7) Nf2 27.Qe2 Nxg3 28.hxg3 Qh3 and white is forced to give up his queen.
Feb-24-07  Ingolf: <Fisheremon> is right, White's position in the puzzle moment was just about as bad as it gets.
Premium Chessgames Member
  playground player: Solved this right away, only took half a second to get all the moves, easy as pie---NOT! This one was way out of my league.
Feb-24-07  Themofro: Saw the knight sac and up until Rf3 which i unfortunately completely missed.
Feb-24-07  bakuazer: beautiful puzzle. I noticed the first 3 moves in the first 3 minutes, but then I thought for about 20 minutes thinking along this and other lines. I finally decided on 22. ..Nxg3 and continued along te same line up to move 26. Then I decided 26...Qxh1 still works for black, followed by NIght checks and takes bishop and I am sure black iswinning ( b4 move is threatening, plus f file belongs to blacks and black is a pawn up) I did not consider the move 26...Rf3 which is a much shorter win, I had gotten very tired.
Feb-24-07  uuft: I'll be back! (around the year 2016, according to my calculations)
Premium Chessgames Member
  Moondoll: OK, meant to get to this earlier, but in the Nxg3 line fritz6 shows 29.Be2?? instead suggesting 29.Re2 Rxd3 30.Nxb5 Rh3+ 31.Kg1 Be3+ 32.Rxe3 Rxe3 33.Nxd6 Rf8 still grim for White. Also 26.Qh1 allows for Rf3! Instead 26.Re2 Raf8 27.Rae1 a6 with only a slight advantage for Black. Very, very interesting puzzle.
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