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Sergey Krasnov vs Jacob Murey
Ch Central Chess Club ( 1/2 ) (1966), Moscow URS
Zukertort Opening: Sicilian Invitation (A04)  ·  0-1



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sac: 31...Ng3+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Jun-24-20  NBZ: After 31. ... Ng3+ 32. hxg3 fxg3! there is no defence. If 33. Rg2 Bxg2+ 34. Kxg2 Qh2+ 35. Kf1 g2+ wins.

I kept wanting to play something more forcing, but the line 31. ... Ng3+ 32. hxg3 Bg2+ 33. Kxg2 Rxg3+ (or Qxg3+) 34. Kf1 does not work since the king now escapes via e2.

31. ... Bf1 (hoping for Rxf1/Qxf1 Ng3+) fails spectacularly to the simple 32. Bxh5! killing Black's attack.

Jun-24-20  NBZ: Black could also play 31. ... Bg4 with the idea that 32. Bxg4 can also be met by 32. ... Ng3+ or the more prosaic 32. ... Rxg4 maintaining the threat of Ng3.
Premium Chessgames Member
  agb2002: Black has a bishop, a knight and a pawn for the bishop pair.

The pawn on f4 suggests 31... Ng3+:

A) 32.hxg3 fxg3

A.1) 33.Re2 Bg4+

A.1.a) 34.Kg2 Qh2+ 35.Kf1 Bxf3 36.Rxh2 (36.Re3 Qh1(g2)#) 36... gxh2 and 37... h1=Q ends up a rook ahead.

A.1.b) 34.Kg1 Bxf3 35.Rg2 Bxg2+ 36.Kxg2 Qh2+ and 37... g2 wins.

A.2) 33.Rh2 Bg2+ 34.Kxg2 (else 34... Qxh2#) 34... Qxh2+ 35.Kf1 g2+ wins.

A.3) 33.Rg2 Bxg2+ as in A.2.

B) 32.Kg1 Nxe4+

B.1) 33.Rg2 Qxe1+ 34.Bxe1 Bxg2 35.Bxg2 f3 - + [r+n+p vs B].

B.2) 33.Bg2 Nxf2 34.Qxf2 Qxf2+ 35.Kxf2 Rxg2+ ends up more than a rook ahead.

B.3) 33.Kh1 Nxf2+ wins.

Premium Chessgames Member
  agb2002: I missed a mate in four with 34... Qh3+ 35.Kg1 Bxf3 in my line A.1.a.
Premium Chessgames Member
  drollere: the starting moves 31. .. Ng3+ 32. hxg3 are obvious, but the variations from there are too intricate for me. after 32. .. f:g3 white has to decide how to give up the R:

31. .. Ng3+
32. hxg3 fxg3
33. Rg2 Bg4+
34. Kg1 Bxf3

Jun-24-20  bcokugras: What if white plays 30. Bxh5?
Jun-24-20  DSCHESS: What if white plays 33. Rh2?
Jun-24-20  WorstPlayerEver: @DSCHESS

33... Bg2+

Premium Chessgames Member
  drollere: <What if white plays 33. Rh2?>

see A.2 in agb2002's analysis above.

Jun-24-20  Brenin: White's 10 f4 and 11 f5, with no Q-side development and the N hanging on the rim at h4, were premature. Then six moves with the same R gave Black time to swing his forces from the Q-side to the K-side, converting what should have been White's K-side attack into Black's. The winning move Ng3+ was not hard to see.
Premium Chessgames Member
  Predrag3141: I didn't analyze 32 … fxg3, because Rxg3 cleanly wins back the bishop, while still attacking (it stinks, but it still wins).

31 … Ng3+ 32 hxg3 Rxg3 33 Rh2 Rxf3 34 Qe2 (preventing … Rf1#)

In a 15 minute analysis, Stockfish evaluates this as -4.17. See below, Black isn't mating, he's just exploiting a very favorable endgame in which he can harrass White's king and pick off pawns. Black's 34th and 35th are crucial; 34 ... Qg3, for example, drops 2 pawns in the evaluation. Apparently the queen needs to stay on white squares to avoid losing a tempo to Be1.

34 … Qg4 35 Rf2 Qh5 36 Rxf3 Bf1+ 37 Qh2 Qxf3+ 38 Kg1 Bd3 39 Qg2 Qd1+ 40 Kh2 Bxc4 41 d6 Be6 42 Qf2 Bxa2 43 d7 Qh5+ 44 Kg1 Qg4+ 45 Kh2 Qxd7 46 Be1 Qd6 47 Qd2 Qh6+ 48 Kg1 Qg6+ 49 Qg2 Qh5 50 Bf2 Be6 51 Bxc5 Bh3

Jun-24-20  saturn2: I spent more time to see what happens after 32.Kg1 and saw

32...Nf1+ 33. Kh1 Qg5 34. Rxf1 (Qxf1 loses material)  Bg2+ 35. Kg1 Bxf3+ 36. Kf2 Qg2 mate

Jun-24-20  saturn2: 32 ...Nf1+seems to fail because of  33. Rg2 
Jun-24-20  alexrawlings: I struggled with this one. I saw <31.. Ng3+ 32 hxg3> but then my mind seemed to freeze and I couldn’t visualise what the board would look like after a couple of moves. I didn’t consider <32.. fxg3> but once I saw it I can see it looks winning before analysing it.

Having put the position through my app I see that if <32 Kg1> then <32.. Ne2++ 33 Kh1> which is easy to calculate. Then my app suggests <33.. Nd4> and white’s position falls apart. I think part of the reason I didn’t see it is that it isn’t a for check or a forcing move, which means white could do anything so my mind just blanks at the thought of all the possible variations and it’s difficulty in visualising the board.

Does anyone have any advice on how to improve board visualisation other than doing lots of puzzles?

Anyway, I enjoyed the puzzle even though I didn’t solve it! :-)

Jun-24-20  mel gibson: The first move was very easy -
I could see that White was in so much trouble.

Stockfish 11 says:

31... Ng3+

(31. .. Ng3+
(♘h5-g3+ ♔h1-g1 ♘g3xe4+ ♖f2-g2 ♗h3xg2 ♕e1xh4 ♗g2xf3+ ♔g1-f1 ♘e4xd2+ ♔f1-e1 ♘d2-e4 ♔e1-f1 ♗f3-g2+ ♔f1-e2 f4-f3+ ♔e2-e3 f3-f2 ♕h4xf2 ♘e4xf2 ♔e3xf2 ♗g2-e4 ♔f2-e3 f7-f5 a2-a3 ♖g8-g2 a3xb4 c5xb4 b2-b3 ♖g2xh2 d5-d6 ♖h2-h3+ ♔e3-e2 ♖h3xb3 ♔e2-d2 ♖b3-d3+ ♔d2-c2 ♖d3xd6+ ♔c2-b3 ♖d6-f6 ♔b3xb4 f5-f4 c4-c5 f4-f3 c5-c6 ♖f6xc6 ♔b4-a5 f3-f2 ♔a5-b4 f2-f1♕ ♔b4-a3 ♖c6-h6 ♔a3-b2 ♖h6-h3 ♔b2-a2 ♕f1-b1+) +M28/62 180)

mate in 28

Jun-24-20  saturn2:  <alexrawlings 32 Kg1 32.. Ne2++>

I looked at this first and saw it wins Q for R+B. But in the strive to get something better i took 32...Nf1 and it was worse.

Pattern recognition can be trained to some extent. I also dont have enough of it. It is said it helps to have started chess at an early age.

Jun-24-20  TheaN: Hm I'm not too happy with my line in the Re2 line. <31....Ng3+> is relatively obvious considering the knight's the only piece not playing an active part in the combination.

<32.hxg3> I mean, this is one of two evils, but 32.Kg1 Nxe4+ (better than 32....Ne2+) 33.Rg2 (else Nxf2+ with disaster) Qxe1+ 34.Bxe1 Bxg2 35.Bxg2 f3 -+ <32....fxg3> and the White rook has no way to escape and therefore Black goes up material in a won position.

<33.Re2> all others fail relatively simple: 33.Rf1 Bg2+ with Qh2#. 33.Rg2 and Rh2 are actually similar 33....B(x)g2+ 34.Kxg2 (Kg1 Qxh2#) Qxh2+ 35.Kf1 g2+ -+. <33....Bg4+>.

But here is where I went a bit haywire after <34.Kg2>. I missed the simple maneuver <34....Qh3+ 35.Kg1 Bxf3 #3> which leads to mate. Even the simple 34....Qh2+ 35.Kf1 Bxf3! I discarded after Kf1, which is the whole reason I was keen to play <34....Bxf3+?! 35.Kxf3<>> and now actually immediately 35....g2? not realizing the queens haven't moved yet. On the board I would not have done that and realized to play <35....Qh5+ first (36.Ke3 g2 37.Rxg2 Qh3+! -+)<>>, but it's sloppy.

Jun-24-20  Mfrankpsyd: I’d forgotten that Murey (still alive!) was Korchnoi’s second in 1978 (see his bio). What a pity that Tal got hooked up seconding for Karpov. I remember feeling broken-hearted after Korchnoi lost that last game, a Pirc of all things, losing the match 6-5. The way his son and wife were held hostage, plus all the other Soviet manipulations, and he still got that close. I still think Korchnoi should have been world champion. His games were so creative and dynamic. A true artist at the board.
Premium Chessgames Member
  Predrag3141: <Korchnoi should have been world champion>

Not to hijack this thread too much, I second that! Not sure he deserved it on the merits, but I'd have loved for it to happen.

Premium Chessgames Member
  gawain: I could see that 31...Ng3+ had to be the first move, but I could not see how to seal the deal after 32 Kg1.
Jun-24-20  W Westerlund: MFrank, I remember. One of the games was adjourned in a very difficult position for Korchnoi. It looked hopeless until Murey, who, according to Timman, had been there more or less as a mascot until then, found the saving move (Nh2!! - I do not remember which game it was). The last game was a Pirc that Korchnoi completely mishandled. I think he was lost after 15 moves or so (after White's e5). It was just unbelievable. Why play a Pirc? One guess is that Korchnoi was so paranoid that he did not want to play any of his regular openings - perhaps there had been a 'leak'. This whole WC was strange with regards to openings: no French, no open Spanish. Ah well.

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