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Viktor Korchnoi vs Lajos Portisch
Hoogovens (1968), Wijk aan Zee NED, rd 12, Jan-24
Spanish Game: Morphy Defense. Modern Steinitz Defense (C72)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Sep-03-14  diagonalley: <cheapo> ditto... 'cute' is precisely the word that sprang to mind - though i must confess i had to stare at it for a few minutes before i spotted it. (bravo to korchnoi for not capitulating immediately!)
Sep-03-14  M.Hassan: "Medium/Easy"
Black to play 13...?
Black has a Bishop for a Knight.

13...........Bxd5!
14.exd5 g3
exposing clear rank 4 for Queen manuevre and if pawn on g3 not taken, gaining good chunk of material.

15.fxg3 Qxc4
16.b3 Qxd5
Black is now a full piece ahead.

Sep-03-14
Premium Chessgames Member
  agb2002: Black has the bishop pair.

White threatens Nxc7+.

The knight on c4 is defenseless. This suggests 13... Bxd5

A) 14.exd5 g3

A.1) 15.Nxe5 gxf2+ 16.Kf1 fxe1=Q+ 17.Qxe1 Qxe1+ 18.Kxe1 Bxe5 - + [R+N].

A.2) 15.Ne3 gxf2+ as in A.1.

A.3) 15.hxg3 Qxc4 - + [N vs P].

B) 14.g3 Bxc4 15.gxh4 (15.Qxd8+ Qxd8, etc.) 15... Rxd1 16.Rxd1 Be2 with the better ending. For example, 17.Re1 Bf3 18.Bg5 Nf6 19.Bxf6 (else Nxe4 - +) 19... Bxf6 20.h5 Rg8 with the plan Rg5, Rh5, Bg5, Bf4 to create a mate attack.

Sep-03-14
Premium Chessgames Member
  morfishine: Tricky to visualize at first, probably due to the "Rank Phenomena"

After 13...Bxd5 14.exd5 g3 White is losing material

NOTE: "Rank Phenomena" is a term I coined for a trait identified in chess players where pins, attacks, checks, captures and/or basic moves are harder to foresee along a rank (vs on a diagonal or on a file). This trait is present even in GM's

*****

Sep-03-14  Nick46: <Gypsy: Wow! Incidentally, the eschewed conclusion is 33.Ke2 Rxe3+ 34.fxe3 Qxg2+ 35.Rf2 Qxf2#.> Thanks Gypsy, this was far, far from obvious to me.
Sep-03-14  cocker: Too cute for me
Sep-03-14
Premium Chessgames Member
  Willber G: <morfishine: "Rank Phenomena">

That should be "Rank Phenomenon". ;-)

Sep-03-14
Premium Chessgames Member
  morfishine: <Willber G> Thank you, I stand corrected
Sep-03-14
Premium Chessgames Member
  whiteshark: Oops, I thought it was white to move... in which case I would have played 'g3' with the threat of Nxc7+ and Qxd8+.
Sep-03-14  eblunt: Unless you saw 31 .... e3 you can't really claim to have got this.
Sep-03-14
Premium Chessgames Member
  FSR: 13...Bxd5 14.exd5 g3! wins material.
Sep-03-14  Refused: 13...Bxd5 14.exd5 g3 and now the knight on c4 is hanging and black also threatens gxf2+ so either the knight or the rook will leave the board shortly.
Sep-03-14
Premium Chessgames Member
  FSR: <Phony Benoni: An example of Korchnoi's implacable will to win leading him astray. After all, he was hungry for points; an unfortunate draw three rounds earlier had meant he started the tournament with only 10.5 points out of 11 games.>

That reminds me of Gyula 1965, where Korchnoi won with 14.5 out of 15, nosing out Honfi and Lengyel, who scored 9-6. Korchnoi spent most of the subsequent press conference ranting about how lucky Lengyel had been to escape with a draw.

Sep-03-14  dfcx: 13... Black to move, material even.

There is no immediate mate threat - so checking to see if we can win a piece.

The pin the D file jumps out on first sight.

13...Bxd5!
A) 14.exd5 g3 wins the knight
B) 14.g3 Bxc4! 15.gxh4 (Not Qxd8+ Qxd8) Rxd1+ 16.Rxd1

Sep-03-14
Premium Chessgames Member
  Penguincw: I considered both 13...Bxd5 and 13...g3, but never thought of playing them together.
Sep-03-14
Premium Chessgames Member
  Fusilli: <eblunt: Unless you saw 31 .... e3 you can't really claim to have got this.>

I did, of course. Prove me wrong if you can.

Sep-03-14
Premium Chessgames Member
  morfishine: <FSR> Yes: Korchnoi vs L Lengyel, 1965

*****

Sep-03-14
Premium Chessgames Member
  Once: The funny thing here is that Korchnoi could argue that he was following the "rules".

Here's our starting position:


click for larger view

Rule #1 - meet an attack on the wing with play in the centre. Black is being aggressive with his queen and pawn kingside storm, so white decides to plant a knight on d5 grabbing the centre.

Rule #2 - open lines against the uncastled king. The black king is two moves away from castling and then will be windy with his g pawn away on operations. So white doesn't mind Bxd5 exd5 to open lines against the black king.

Great in theory, but with the big hole in the logic that the c4 knight is hanging. All of which makes me wonder. Did Korchnoi do this on purpose to whip up an attack?

Accidental piece drop or deliberate (but flawed) sacrifice?

Not sure. Really not sure.

Sep-03-14
Premium Chessgames Member
  kevin86: Black is real coy here; he takes one knight, but is really after the other! The pawn move is like a double fork-the pawn forward and the queen on the knight.
Sep-03-14  estrick: <Oct-13-04 checkpat: Is 6..g5 theory?>

<Oct-13-04 themindset: it's only theory due to this game, i believe. there are no immediate drawbacks to 6...g5 (and it definitely makes white uncomfortable), but it is probably too lose if white plays accurately.>

<Oct-13-04
Gypsy: <Did 14...g3 come as a complete surprise to Korchnoi? > Without a doubt >

Incredibly, Fritz at a depth of 20, rates 6. ...g5! as its #1 choice

1. (0.12): 6 ...g5
2. (0.35): 6 ...Be7
3. (0.35): 6 ...Nf6

Sep-03-14
Premium Chessgames Member
  pittpanther: This one took me a while today. I did eventually get it but only slowly!
Sep-03-14
Premium Chessgames Member
  morfishine: <Once> No doubt, this was a slip, probably due to the "rank phenomenom" I mentioned earlier: referencing chess, a difficulty in visualizing sideways threats of all types
Sep-03-14  TheBish: Korchnoi vs Portisch, 1968

Black to play (13...?) "Medium/Easy"

For some reason I was stumped for several minutes on this one, almost ready to give up in fact. The reason would have to be that I had tunnel vision, focused on the pin on the d-file. I was trying to take advantage of the pin with moves like ...Bb5 followed by ...c6, which is easily met (after 13...Bb5) by 14. g3! Qh3 15. Nxc7+ Ke7 (or 15...Kf8 16. Ne6+) 16. Nd5+, etc.

Not seeing how to take advantage of Black's aggressive queen position, I then noticed a hidden possibility on the fourth rank.

13...Bxd5! 14. g3

Or 14. exd5 g3! with dual threats of 15...Qxc4 and 15...gxf2+, e.g. 15. Qe2 gxf2+ 16. Qxf2 Qxc4 and Black has won a piece.

14...Bxc4! 15. gxh4 Rxd1 16. Rxd1 and Black has not only won two knights for a rook, but White's kingside pawns are destroyed.

Jul-30-16
Premium Chessgames Member
  perfidious: <Gypsy....the eschewed conclusion is 33.Ke2 Rxe3+ 34.fxe3 Qxg2+ 35.Rf2 Qxf2#.>

I too would have declined the opportunity to see the finish--Korchnoi had likely taken enough battering for one session, what with his chances at a clean score long gone.

Nov-26-16
Premium Chessgames Member
  perfidious: <FSR: That reminds me of Gyula 1965, where Korchnoi won with 14.5 out of 15, nosing out Honfi and Lengyel, who scored 9-6. Korchnoi spent most of the subsequent press conference ranting about how lucky Lengyel had been to escape with a draw.>

Were his first words 'Why must I draw with this idiot?', a la Nimzowitsch?

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