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Zigurds Lanka vs Semen I Dvoirys
URS-chT (1988), Naberezhnye Chelny URS, Oct-??
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation Chelyabinsk Variation (B33)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
May-14-20  Granny O Doul: I'm a fan of 32. Ne6+, with lines like 32...Kg6 33. exf5+ Kxf5 34. g4+ Ke4 35. Bd3+ Kf3 36. Qg3#. Or 32... Kh8 33. Rxf7 Bxf7 34. Qxh6 Bxe6 35. Qxf6+ Kg8 36. Bxe6#.
May-14-20  TeaChess: 33. Ne6+ better
May-14-20  TeaChess: Granny is right. 32. Ne6+ best.
May-14-20
Premium Chessgames Member
  al wazir: My line also seems to win: 30. Nce8+ Kh8 31. Bxg8 Rbxe8 32. Nxe8 Rxe8 33. Qxh6 Rxg8 34. Rd7.

But black defends with 33...Kxg8 34. Rd7 Rf7.

Rats.

Still, white has ♖+♙ vs. ♘. Should be enough for a win.

May-14-20
Premium Chessgames Member
  PawnSac: the most black can stretch it out is..

32.Ne6+ Kh8 33.Rxf7 Bg7 34.Rxg7 Qd8 35.Qh6 Rb7 36.Rxb7 Qc7 37.Qxf6+ Qg7 38.Qxg7+

May-14-20
Premium Chessgames Member
  scormus: I fancied 32 Ne6+ as well, there a nice K hunt leading to # after ... Kg6, but B can drag it out with 32 ... Kh1.

Ah, I see I'm not the first to have found them

May-14-20  Brenin: I went for 30 Nce8+, which seems to win, but less decisively than 30 Nf5+. In <al wazir>'s line, 33 Bf7 is better than Qxh6; either looks good enough to win.
May-14-20
Premium Chessgames Member
  agb2002: White has a bishop, a knight and a pawn for the bishop pair.

Black threatens Qc7.

Black's second rank is weak. This suggests 30.Nf5+:

A) 30... gxf5 31.Rd7+

A.1) 31... Bf7 32.Ne6+

A.1.a) 32... Kg8 33.Qxh6 and 34.Qg7#.

A.1.b) 32... Kh8 33.Qxh6 Rg8 34.Rxf7 wins.

A.2) 31... Rf7 32.Bxf7

A.2.a) 32... Bxf7 33.Ne6+ as in A.1.

A.2.b) 32... Rd8 33.Ne6+ as in A.1.

A.3) 31... Kh8 32.Qxh6

A.3.a) 32... Bf7 33.Qxf6+ Kg8 34.Bxf7+ and mate in two.

A.3.b) 32... Rf7 33.Rxf7 Bxf7 34.Qxf6+ Kg8 35.Qxf7+ Kh8 36.Qf6#.

A.4) 31... Ne7 32.Rxe7+ Kh8 (else as in A.1) 33.Qxh6 B(R)f7 34.Bxf7 wins decisive material.

B) 30... Kh8 (White has three piece attacked) 31.Bxg8

B.1) 31... Qxc7 32.Nxh6 Rxg8 33.Nxg8 wins decisive material.

B.2) 31... Bg5 32.Qxh7#.

B.3) 31... Rxg8 32.Nxh6 as in B.1.

B.4) 31... Kxg8 32.Nxh6+ and 33.Nd5 wins decisive material.

May-14-20  sudoplatov: I got 30.Nf5 gf5, 31.Rd7 Rf7, 32.Bf7 Bf7 but gave up as I didn't see 33.Nd5.
May-14-20  sudoplatov: I also went through, 33.Ne6 Kg6, 34.ef5 Kf5, 35.Qh3 but which seemed good but I couldn't see the Mate in 2 afterwards.
May-14-20  offramp: White has a restless pair of knights in this game.
May-14-20  malt: Went for 33.Ne6+ at first,

Then 33.Nd5 Bg5 34.R:f7+ K:f7 35 Q:h7+ and 36.N:b6

May-14-20  morfishine: I had a hard time visualizing this one, but what a cool name, 'Zigurds'
May-14-20
Premium Chessgames Member
  Predrag3141: <I'm a fan of 32. Ne6+> The chess engine says it's mate in 6: 32...Kh8 33.Rxf7 Bg7 34.Rxg7 Qd8 35.Qh6 Rb7 36.Rxb7 Qe7 37.Rxe7 Bxe6 38.Qxh7#
May-14-20  mel gibson: I wasn't sure.
Stockfish 11 says the same as the text:

30. Nf5+

(30. Nf5+ (♘d6-f5+
♔g7-h8 ♗c4xg8 ♕b6xc7 ♘f5xh6 ♖b8-a8 ♗g8-d5 ♖a8-a7 ♖d1-d3 ♕c7-b6 ♖d3-f3 ♘c6-b8 ♘h6-g4 ♘b8-d7 ♕h4-h6 ♕b6-d8 ♖f3-h3 ♕d8-e7 ♕h6xg6 f6-f5 ♘g4-e3 ♘d7-f6 ♘e3xf5 ♕e7-e8 ♕g6xe8 ♖f8xe8 ♘f5-d6 ♖e8-f8 c3-c4 ♘f6xd5 c4xd5 ♖f8xf2 ♖f1-b1 ♔h8-g7 ♔h1-g1 ♖f2-f4 ♘d6-f5+ ♖f4xf5 e4xf5 ♖a7-a2 d5-d6) +8.15/36 104)

score for White + 8.15 depth 36

However as per the text if Black replies
30...gxf5

Then it's mate in 31

31...gxf5

(31.
Rd7+ (♖d1-d7+ ♘c6-e7 ♖d7xe7+ ♖f8-f7 ♗c4xf7 ♗g8xf7 e4xf5 ♕b6-b1 ♕h4-c4 ♕b1-b3 ♖e7xf7+ ♔g7-g8 ♕c4-e6 ♕b3xe6 f5xe6 ♗h6-g5 ♖f7-d7 f6-f5 e6-e7 ♗g5xe7 ♖d7xe7 ♔g8-f8 ♖e7xh7 ♔f8-g8 ♖h7-e7 ♔g8-f8 ♖e7xe5 f5-f4 ♖f1-d1 ♖b8-b6 ♖e5-b5 ♖b6-f6 ♖d1-d7 ♖f6-f7 ♖d7xf7+ ♔f8xf7 ♖b5-f5+ ♔f7-e7 ♖f5xf4 ♔e7-d7 ♖f4-e4 ♔d7xc7 g2-g4 ♔c7-d7 g4-g5 ♔d7-c6 g5-g6 ♔c6-d6 g6-g7 ♔d6-d5 ♖e4-e3 ♔d5-d6 g7-g8♕ ♔d6-c6 ♕g8-e6+ ♔c6-b7 ♕e6-f6 ♔b7-c7 ♖e3-e7+ ♔c7-b8 ♕f6-f8+) +M31/63 )

May-14-20
Premium Chessgames Member
  chrisowen: Literally!
May-14-20  JohnBoy: I spent a lot of time on 30.Nd (or c) to e8+, and do not see <wazir>'s win. Let's say 30.Nce8+ Rbe8 31.Ne8+ Re8 32.Rd7+ Re7 and black is holding it together.
May-14-20  TheaN: Holy damn they went from a Monday-on-Wednesday to a Saturday-on-Thursday. Though, perhaps because I made it harder on myself then was necessary; but more decisive a win, though!

<30.Nf5+!> There are a couple of patterns to see here:

1) White always wins a tempo if Black takes on f5.

2) The White rook invading the 7th rank is pretty much always fatal.

3) Black can't move up the board with Kg6 at any point.

30....gxf5 is of course the prosaic reply, but in this case I reckon Black's better off declining. After 31.Rd7+ Black has a lot of evils:

31....Kg6? is pretty much the nail in the coffin with the other knight still on c7 32.exf5+ Kxf5 33.Bd3+ e4 34.Qxe4#.

31....Kh8? is too late now as it loses a crucial tempo after 32.Qxh6, threatening Qg7#. 32....Bf7 (Rf7 33.Rxf7 similar) 33.Qxf6+ Kg8 34.Bxf7+ Rxf7 35.Qxf7+ Kh8 36.Qf6#.

31....Bf7? is way too passive 32.Ne6+! Kg6 (Kg8; Kh8 33.Qxh6 with mate) 33.exf5+ Kxf5 34.Bd3+! Kxe6 (e4 35.Qxe4#) 35.Qg4+ f5 36.Qxf5#.

31....Rf7 is similar though, yet more active: 32.Ne6+! still: 32....Kg6 (Kh8 33.Rxf7! +- is horrible: 33....Bg5 34.Nxg5! and 33....Bxf7 34.Qxf6+ Kg8 35.Qxh6 with mate) 33.exf5+ Kxf5 34.Qh5+!: now using the light squares as the rook's defending the f-pawn. 34....Bg5 (Ke4 35.Qf3#) 35.g4+ Ke4 36.Bd3+ Kf3 37.Qh3#.

Finally, what I would call the 'intermezzo' 31....Ne7 32.Rxe7+, with all aforementioned variations to come. It's not relevant though, as Black gave back the piece only to let the queen scope on e6 which is not enough. The only standalone variation would be 32....Bf7 33.Ne6+ Qxe6?! 34.Bxe6 +-.

What stumped me the longest was the sac decline, <30....Kh8!?>. White has three (!) pieces in but comes an exchange on top with <31.Bxg8!>, as moving Bh6 allows Qxh7# and after either 31....Kxg8, Rxg8 or Qxc7 comes 32.Nxh6! ± with three different duties: check, attacking Rg8 or defending Bg8. The best variation probably is not Kxg8 as in both other variations <31....Rxg8 (Qxc7 32.Nxh6 Rxg8) 32.Nxh6 Qxc7 33.Nxg8 +-> as White comes out 'only' an exchange up, but Black's in shambles.

May-14-20  Brenin: <JohnBoy>: After 30 Nce8+ Rbxe8 31 Nxe8+ Rxe8 a better move is 32 Bxg8, e.g. 32 ... Kxg8 33 Qxh6 or 32 ... Rxg8 33 Rd7+ followed by Qxh6. Either way, White comes out the exchange and a pawn ahead, and still attacking.
May-14-20  King.Arthur.Brazil: I found the sequence: 30. ♘f5+ gxf5 then:
A) 31. ♖d7+ ♗f7 32. ♘e6+ ♔g6 33. exf5+ ♔xf5 34. g4+ ♔e4 35. ♗d3+ ♔f3 36. ♕g3#
If 33... ♔g8 or ♔h8, then 34.♕xh6 with three check-mates, ♕g7# and for 34...♗xe6 ♕g7# or ♕xh7#.

B)31. ♖d7+ ♖f7 32. ♗xf7 ♗xf7 33. ♘e6+ ♔g8 34. ♕xh6 with the same net of check-mate. If black pylays 32...♖d8, for instance, 3. ♘e6+ ♔h8 34. ♕xh6} and check-mate next.

The possibility 32. ♘e6+? ♔h8 33. ♕xh6 ♖bf8? 34. ♘xf8 ♖xd7 35. ♘xd7 ♕d8 36. ♗xg8 ♔xg8 37. ♘xf6+ ♔f7 38. ♘d5 win. Obviously, black cannot play 33...♖xd7 due to 34.♕xf6+ ♖g7 35.♕xg7#. But black can scape with 33...♖b7! and white is paralized. That's why the 32.♗xf7 must be played! Time to check out!

May-14-20
Premium Chessgames Member
  Jimfromprovidence: I got the following line:

30 Nf5+ Kh8 31 Bxg8 Rxg8 32.Nxh6 Qxc7 33 Qxf6+ Rg7.


click for larger view

White is up two pawns but I missed the follow up killer moves 34 Rd6 Na7?! ( to avoid losing a piece) 35 Rfd1.


click for larger view

The threat is 36 Rd8+. Playing 35...Nc6 concedes a piece and even worse white can still play 36 Rd8+ because taking with the knight allows Qf8+ with mate next move.

There is also a variation in the line after 36 Rd8+ that if initiated by black causes black to lose his queen to a knight fork.

May-14-20  morfishine: <Jimfromprovidence> Nice post, good to see you!
May-14-20
Premium Chessgames Member
  Jimfromprovidence: Thanks <morf>. I still try to do the puzzles, I just don't comment as much as I used to do.
May-14-20  RandomVisitor: After 26.Nc4 black is even with 26...Qd7


click for larger view

Stockfish_20050909_x64_modern:

<52/52 03:55 0.00 26...Qd7 27.Qf6+ Kg8 28.Qf3 Kh8> 29.Nf6 Qe7 30.Rxd6 Nd4 31.cxd4 Bxc4 32.dxe5 Qxe5 33.Rc6 Rb3 34.Qg4 Be6 35.Qh4 Qg5 36.Qxg5 Bxg5 37.Nd5 Rb2 38.Bc4 Rc2 39.f4 Bh6 40.Ne3 Rc3 41.Nd5

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