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Viktor Kupreichik vs Valery A Chekhov
URS-ch FL44 (1976), Minsk URS, Oct-??
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation Chelyabinsk Variation (B33)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Mar-09-08  D.Observer: Unbelievable solution!
Mar-09-08  mindkontrolle: Wow

Mar-09-08  RandomVisitor: 21.Bf1 fxg2 22.Be2 is playable but should also fail to go anywhere.
Mar-09-08
Premium Chessgames Member
  dzechiel: Black to play. Material even. "Insane."

Looking at the position, you might ask yourself, "What's holding the white bishop on the board, Kupreichik's finger?"

No, white thinks he's laid a trap that goes 18...Qxd3 19 Rd2 Qxc4 20 Rxd8#. But white may have overlooked something. I'm looking at

18...Qxd3 19 Rd2 Rxg2+

White can't take with the rook as 20 Rxg2 Qxd1+ 21 Rxd1 Rxd1+ wins a bishop for black. And white can't not take the rook as 20 Kh1 Rxd2 also wins the bishop. White must take the rook with the king...

20 Kxg2 Qg6+ 21 Kf1

OK, this isn't going well for black. But! I think I see an improvement on the first move of the combination. Let's try

18...e4

White can't move the bishop on the b1-h7 diagonal without allowing 19...Qxc4 and uncovering an attack on the white queen. White can't leave the bishop where it is (19...exd3), so white must choose between

- 19 Be2
- 19 fxe4

If white tries

19 fxe4

then the combination from above takes on new life, eg:

19...Qxd3 20 Rd2 21 Rxg2+ Kxg2 22 Qxe4+

with a lot of pull. It's not so clear after

19 Be2

but I think black can play

19...Qc5

uncovering an attack on the queen and readying 20...exf3.

As this is an "insane" position, I feel less compelled to show everyone exactly what my limitations are. I'm gonna peek at the game now and see if I was on the right track.

Looking forward to Monday.

Mar-09-08  RandomVisitor: 1: Viktor Kupreichik - Valery A Chekhov, URS 1976


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Analysis by Rybka 2.3.2a mp : 18-ply

1. (-0.78): 18...e4 19.Be2 exf3 20.Qxd5 Bxd5 21.Bf1 fxg2 22.Be2 Rg6 23.Ne3 Bb7 24.Bh5 Rg5 25.Bf3

2. (-0.24): 18...Qd4 19.g3 f5 20.Be2 f4 21.Qxd4 exd4 22.g4 d3 23.Bd1 Rd4 24.Rc1 Bd5 25.Bb3

3. (-0.23): 18...Qxd3 19.Rd2 Bxf3 20.Rxd3 Bxd1 21.Raxd1 Rxd3 22.Rxd3 Rg4 23.b3 Rd4 24.Rh3 Rd1+ 25.Kf2

Mar-09-08  goldfarbdj: I found something like RandomVisitor's third line. I never even considered e4....
Mar-09-08
Premium Chessgames Member
  Jimfromprovidence: I wonder why white played 24 Bc4 and not 24 Bxh7 below.


click for larger view

That move would have left him only a pawn down but with an excellent chance to capture black's g pawn and equalize.

Mar-09-08  dragonfish1803: Jimfromprovidence.....I reckon after 24.Bh7 black plays 24....Ng6 then if 25.Nxg2 black plays 25....Rd2. After say 26.Re1+ Kf8 27.Nf4 Rxb2 white is going to have to look after his a pawn, guard against a very nasty check on g2 and sooner or later is going to have to exchange his bishop for the black knight on g6, undoubling black's f pawns. The rook+ bishop v rook+knight end game with at least one good extra pawn looks like a winner for black to me. That's how I'd play it anyway but I'm just a patzer like the rest of us !
Mar-09-08  Steve Case: I would have played Pawn to e4 and even the next move. But after that it's way over my head (-:
Mar-09-08  chessfreako: Hmm went through the move but couldn't find anything after 19.. exf3, completely forgot about the rook at g8. T_T

Anyways, something I noticed, I was wondering why not 28.Re2. Seemed to solve plenty of problems since the bishop stationed at c4. But suddenly I realized.

28. Re2 Rxe2
29. Bxe2 Nf4!

And ridiculously, white has no way of getting the black pawn at g2 due to the pesky knight controling the d5 square. Leaving the black king free to wreck terror across the board.

Nice puzzle =D

Mar-09-08  zanshin: <Jimfromprovidence> Good question!

1: Viktor Kupreichik - Valery A Chekhov, URS 1976


click for larger view

Analysis by Rybka 2.3 mp 32-bit (20-ply):

1. (-0.62): 24.Bxh7 Kf8 25.Rc1 Ng6 26.Bxg6 fxg6 27.Rc2 Be4 28.Re2 f5 29.Kf2 g5 30.Nxg2 Kg7

2. (-1.61): 24.Bc2 Ng6 25.Re1 Kf8 26.Bxg6 fxg6 27.Rd1 Rxd1+ 28.Nxd1 f5 29.Ne3 Ke7 30.Nxg2 g5

3. (-1.73): 24.Bc4 Ng6 25.Nxg2 Ne5 26.b3 Rd2 27.Nh4 Rd4 28.Nf5 Rg4+ 29.Ng3 Nxc4 30.bxc4 Rxc4

Mar-09-08
Premium Chessgames Member
  Jimfromprovidence: <Dragonfish1803>.....<I reckon after 24.Bh7 black plays 24....Ng6 then if 25.Nxg2 black plays 25....Rd2?>

White should not play 25 Nxg2 and allow black's rook access to the 2nd rank. Instead he should play 25 Bxg6. Then after 25...fxg6 26 Rd1 keeps black's rook at bay.


click for larger view

Black will now lose that g pawn and the match should be dead even.

Mar-09-08  Jason Frost: Hmmmm I looked at e4 but couldn't find any solution after fxe4.
Mar-09-08  Jason Frost: Ah overlooked that after fxe4 Qxd3 Rd2 Rxg2 Kxg2 white can just play Qxe4+, very nice puzzle.
Mar-09-08
Premium Chessgames Member
  whiteshark: <Jason Frost> Exactly the same thing happened to me as to you.
Mar-09-08
Premium Chessgames Member
  johnlspouge: Sunday (Insane): Black to play and win

Material: even. The Rg8 faces the Black Kg1. The Bd3 protects Nc4. The White battery Rd8 and Qd5 pin Bd3 to Qd1, although the move Be2 is available to relieve the pin. The White battery Bb2 and Qd5 have an implicit mate threat at g2, supported by Rg8. White has the nuisance check 19.Qxa4+ Bc6, but because Bc6 threatens Qa4, 19.Qxa4+ does not gain a tempo.

Candidates (18): Rxg2+, Qxd3, e4, Qd4

18Qxd3 19.Rd2 (threatening Rxd8#) Qxd2 20.Nxd2, exposing a burden for Nc4

Contrary to initial impression, White is near paralysis. Standard strategy suggests opening the position.

18e4 (threatening 19exd3).

Because the nuisance check 19.Qxa4+ does not work, White has two moves: (1) 19.fxe4 and (2) 19.Be2.

(1) 19.fxe4 Qd4 (pinning Rf2, and threatening 20.Bxe4 and 21.Bxd3 or 21.Rxg2+)

To avoid material loss from Qxd3 and Qxc4, White has one move:

20.Be2 Qxe4 (threatening 21Qxe2, 21Rxd1, or mate, beginning with 21Rxg2+)

21.Qf1 Qd4 (again pinning Rf2 - this time without Pe4 obstructing Bb7 - and threatening Rxg2+)

22.g3 Nf5, threatening

23Nxg3 24.hxg3 [else, Nxe2# or Nxf1] Rxg3+ 25.Kh2 Qh4+ 26.Qh3 Qxh3#

There is no defense.

(2) 19.Be2

Candidates (19): e3, Qc5, Qg5

19Qc5 (threatening 20Rxd1 and 20exf3)

20.Qb3 [Nd2 e3] [Qa4+ Bc6 is essentially the same]

Candidates (20): exf3, Bd4

20exf3 (threatening 21Rxg2+)

21.Bxf3 Bxf3 22.Qxf3 Qxc4 23.Qxf6

winning Nc4 for Pf6, with a material advantage in a double-edged but winning position.

I suspect the second line can be improved, but it is sufficient to justify 18e4, which is a relatively easy candidate to find. I cannot check my analysis of 19.fxe4 with a computer right now, but the response 19.Be2 definitely looks better.

Mar-09-08
Premium Chessgames Member
  johnlspouge: Toga II 1.3.1 indicates both of my lines after 18...e4 are drawing:

[ply 14/41, time 00:16, value -0.03]

18...e4 19.Be2 Qc5 20.Qa4+ Bc6 21.Qa3 Qxa3 22.bxa3

[ply 14/42, time 00:02, value 0.00]

18...e4 19.fxe4 Qd4 20.g3 Qxd3 22.Rd2 Rxg3+ 23.hxg3 Qxg3+,

and 24...Qf4+ with perpetual check.

The key to the combination, as <dzechiel> and others pointed out, is that after

18...e4 19.fxe4

the combination

19...Qxd3 20.Rd2 Rxg2+ 21.Kxg2

gets some bite from

22.Qxe4+

Mar-09-08
Premium Chessgames Member
  whiteshark: The line starting with <21.Bf1 fxg2 22.Be2> looks indeed (as <RV> pointed out) as white's best continuation, e.g. <22...f5 23.Ne3 Bb7 24.Rd1 Rxd1 25.Bxd1>


click for larger view

Mar-09-08
Premium Chessgames Member
  DarthStapler: Didn't see it, but then again I didn't really try
Mar-10-08
Premium Chessgames Member
  kevin86: Black was able to use the pawn at g2 to hold white hostage and cost him a piece.
Mar-10-08  012: Saturday puzzle <23. ?> Mar-08-08 Vyzmanavin vs V Ruban, 1989
Mar-14-08
Premium Chessgames Member
  patzer2: The Saturday March 9, 2008 puzzle solution 18...e4!! is a decoy sacrifice which gives Black a strong attack if White falls into the trap 19.fxe4 Qxd3 20 Rd2 21 Rxg2+ Kxg2 22 Qxe4+ (see analysis by <dzechiel> and <johnlspouge>).

White's best after 18...e4 is apparently 19. Be2 exf3 as analyzed by <RandomVisitor> and <Rybka>.

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