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Lev Milman vs Anatoly Bykhovsky
SPICE Cup (group B) (2011), Lubbock, TX USA, rd 4, Oct-17
Sicilian Defense: Kan. Polugaevsky Variation (B42)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Given 11 times; par: 45 [what's this?]

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sac: 18...Rxg5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Oct-26-11  Whitehat1963: What an excellent exchange begun after 18. Kxf2.
May-24-19  LoveThatJoker: 18...RxB! 19. QxR QxN! with Black having the advantage; as 20. PxQ allows 20...NxP+ forking K and Q. LTJ
May-24-19
Premium Chessgames Member
  agb2002: Black has a rook for a bishop and a knight.

White threatens Bxf6.

The possibility of a knight fork suggests 18... Rxg6:

A) 19.Qxg5 Qxc3

A.1) 20.bxc3 Nxe4+ and 21... Nxg5 wins a pawn with the better ending. For example, 21.Ke3 Nxg5 22.Bf3 Nd6.

A.2) 20.Qg8+ Nxg8 21.bxc3 Bxe4 with the same conclusion.

A.3) 20.Qf4 Qxb2 (20... Nxe4+ 21.Qxe4) and Black seems to end up a pawn ahead.

A.4) 20.Qg7 Nxe4+ and 21... Qxg7 wins.

B) 19.Nxb5 axb5 wins decisive material.

C) 19.Nd5 exd5 wins decisive material.

May-24-19  stacase: Take the Bishop, take the Knight, fork the King & Queen. Results: Queens off the board and a Rook for a Bishop, Knight & Pawn. Pretty good deal, turns an ugly fight with a Rook against a Knight & Bishop into a one Pawn up slight advantage.

I usually miss these tricky knight fork set-ups but I did see this one (-:

May-24-19  goodevans: I found this just a little on the easy side for a Friday.

Seeing that the whole combination started with <16...Nxf2> I found myself asking why the puzzle hadn't started there. The answer is that white should have broken the combination with <18.Kf1!>.


click for larger view

White is temporarily down the exchange but there's no satisfactory way he can save both the Nf6 and Bf2. If, for example, <18...Qe5> then <19.Bf4> would trap the Q.

May-24-19
Premium Chessgames Member
  malt: 18...R:g5 19.Q:g5 Q:c3 sets up a knight fork, winning material.
May-24-19  1stboard: Black with the beautiful threat of 33 ... d5 ++ !! Unless white gives up rook with 33 ... Rxd7 ....

Resignation clearly in order

May-24-19  dTal: Saw the rook sac and temporary q sac in an instant, but lots of nifty tactics afterwards by B with the rook invasion that are hard to see.
May-24-19
Premium Chessgames Member
  patzer2: After a long look, I finally saw the Knight fork possibility 18...Rxf5! 19. Qxg5 Qxc3! 20. bxc3 Nxe4+ ∓ (-0.94 @ 34 ply, Stockfish 10) solving today's Friday puzzle.

Although the combination starting with 18...Rxf5! secured an advantage for Black and is the only move that doesn't lose, it was not clearly decisive.

Black's winning move came after White's error 24. Ra7?, allowing 24...Rxc3+! -+ (-1.92 @ 30 ply, Stockfish 10).

Instead of 24. Ra7?, White could have secured practical drawing chances with 24. Nd4 Rxc3+ 25. Bd3 ∓ (-0.94 @ 32 ply, Stockfish 10).

Earlier, the computer indicates White missed a win with the recapture 18. Kxf2?, allowing 18...Rxg5! ∓.

Instead, White could have secured a win by declining the Bishop sacrifice with 18. Kf1! +- (+2.86 @ 35 ply, Stockfish 10). Fortunately for Black, 18. Kxf2? allowed him to turn the tables, bail out of a lost position and steal the advantage with 18...Rxf5! As such, 18...Rxf5! ∓ was a clever swindle.

May-24-19  mel gibson: I saw the first 2 plies -
The white Queen had to be distracted.

However Stockfish 10 plays
the same sequence but gives less
than a 1 pawn advantage to Black.

18.... Rxg5

(18. .. Rxg5
(♖g6xg5 ♕h4xg5 ♕c7xc3 b2xc3 ♘f6xe4+ ♔f2-e3 ♘e4xg5 a3-a4 ♖a8-c8 a4xb5 a6xb5 ♘b3-d4 ♔e8-e7 ♘d4xb5 f7-f5 c3-c4 ♘g5-f7 ♔e3-d4 h7-h6 ♖a1-a5 ♔e7-f6 ♖a5-a7 ♗b7-c6 ♘b5-c3 ♖c8-b8 ♖a7-a6 ♖b8-b2 ♗e2-d3 ♔f6-e7 ♖a6-a2 ♖b2-b6 ♔d4-c5 ♖b6-b8 ♔c5-d4 ♖b8-g8 ♗d3-e2 ♖g8-c8 ♖a2-a7 ♗c6-g2 ♘c3-b5 ♗g2-e4 ♗e2-d3 ♗e4-c6 ♖a7-c7 ♖c8-b8) +0.89/39 135)

score for Black +0.89 depth 39

May-24-19  clement41: Hello all,
I put the position on a physical board, set 20' on my chess clock and started solving. I came across a line that I believe is the toughest resistance for white that noone among the kibitzers seems to have noticed til now.

Here it is:
18...Rg5
19 Qg5 Qc3
20 bc (nothing better: Qg8+ Ng8 bc Be4 -+) Ne4
21 Ke3 Ng5

here I saw that the Ng5 only has e4 to flee from h2-h4.

Hence 22 Nc5! (posing serious threats: Nxb7 and controlling e4) 22... Bd5 23 h4 Rc8! (that's my point: ...Rc8 is the only move as 23...d6? fails to 24 Na6! when black has to find 24...Kd8!! removing the threats but now white has a large edge after either 25 hg ab 26 Bb5 or 25 Nb4 Ne4 26 Nd5 ed)

and the endgame is far from over or trivial, black has a slight to material edge

May-24-19  dumbgai: Could also have been a slightly tougher puzzle starting two moves earlier.
May-24-19  cormier:


click for larger view

Analysis by Houdini 4 d 22 dpa done

1. + / = (0.51): 12...d6 13.Kh1 Nfg4 14.Qxd8+ Kxd8 15.f4 Nd7 16.Bxg4 Rxg4 17.h3 Rg6 18.f5 Rg8 19.fxe6 fxe6 20.Bf4 Ke7 21.Nc3 Ne5 22.Na5 Bb6 23.Bxe5 dxe5 24.Nc4 Bd4 25.Ne2 b5 26.Nxd4 exd4 27.Na5 Bd7 28.Kh2 e5 29.Rf2 Raf8 30.Raf1 Rxf2 31.Rxf2 h5 32.Rf1 h4

2. + / = (0.52): 12...b5 13.Bg5 h6 14.Bxf6 Rxf6 15.N1d2 d6 16.a4 b4 17.Rac1 Bd7 18.a5 Bc8 19.g3 Bb7 20.Kg2 Rg6 21.Qxd8+ Kxd8 22.c3 bxc3 23.Rxc3 Rc8 24.Rxc8+ Kxc8 25.Bh5 Rg5 26.f4 Rxh5 27.fxe5 Rxe5 28.Rxf7

May-24-19  cormier:


click for larger view

Analysis by Houdini 4 d 22 dpa done

1. + / = (0.33): 11...Neg4 12.Bxg4 Rg6 13.Qh4 Nxg4 14.Qxd8+ Kxd8 15.h3 Ne5 16.Bf4 d6 17.Bxe5 dxe5 18.N1d2 Bd7 19.Kh2 Ke7 20.g3 Rc8 21.c4 Rgg8 22.Rac1 f5 23.c5 Bb5 24.Rfd1 f4 25.Nc4 fxg3+ 26.fxg3 Bxc5

2. + / = (0.39): 11...Rg6 12.Qh4 d6 13.a4 Bd7 14.Nc3 Rc8 15.g3 Nc4 16.Bxc4 Rxc4 17.Be3 Bxe3 18.fxe3 e5 19.Nd2 Rc8 20.Rf2 Be6 21.Raf1 Ng4 22.Qxd8+ Kxd8 23.Re2 Rh6 24.h4 Rg6 25.Kg2 h5 26.a5 Kd7

May-24-19  cormier:


click for larger view

Analysis by Houdini 4 d 23 dpa done

1. = (0.23): 7...Ne7 8.Qe2 0-0 9.Be3 Bxe3 10.Qxe3 Nbc6 11.Nc3 d6 12.f4 Qc7 13.Rf3 Bd7 14.Rg3 h6 15.a3 Rac8 16.Rd1 Kh8 17.Be2 e5 18.f5 b5 19.Rh3

2. + / = (0.39): 7...Nc6 8.Qg4 Qf6 9.Nc3 Nh6 10.Qe2 Qh4 11.h3 0-0 12.Be3 Bxe3 13.Qxe3 f5 14.exf5 Nxf5 15.Bxf5 Rxf5 16.f4 Qf6 17.Rae1 d5 18.g4 Qg6 19.Ne2 e5 20.Kh2 Rf8 21.fxe5 Rxf1 22.Rxf1 Qxc2

May-24-19  Marwanalbahlawan: What about thiis line: 22-Nc5 gobe me your bishop b7 Bc6 or 0-0-0 then 23-h5! d6 the only solution (Nh3? Bg4+ - Winning material) 24-Nxa6 Rxa6 25- hxg5 and White CAN fight for thé end game
May-24-19  cormier:


click for larger view

Analysis by Houdini 4 d 23 dpa done

1. = (0.17): 5...Nf6 6.0-0 Qc7 7.Qe2 d6 8.Be3 Nbd7 9.Nd2 Be7 10.a4 0-0 11.a5 d5 12.N4f3 Nc5 13.Bd4 Bd7 14.exd5 Nxd5 15.Be5 Qc6 16.Bc4 Rad8 17.Rad1 h6 18.Nd4

2. = (0.24): 5...Qc7 6.0-0 Nf6 7.Qe2 d6 8.Be3 Nbd7 9.Nd2 Be7 10.a4 0-0 11.a5 d5 12.N4f3 Nc5 13.Bd4 Bd7 14.exd5 Nxd5 15.Be5 Qc6 16.Bc4 Rad8 17.Rad1 h6 18.Nd4

May-24-19  cormier:


click for larger view

Analysis by Houdini 4 d 22 dpa

1. = (0.24): 5.c4 Nf6 6.Nc3 Qc7 7.f4 Bb4 8.e5 Ne4 9.Qd3 Nc5 10.Qe3 Nc6 11.Be2 0-0 12.Bd2 Nxd4 13.Qxd4 b6 14.0-0 Bb7 15.Nd5 Bxd5 16.Bxb4 Be4 17.Rad1 Qc6

2. = (0.17): 5.Be2 Nf6 6.Nc3 Bb4 7.Qd3 d6 8.0-0 0-0 9.Bd2 e5 10.Nb3 Nc6 11.Rad1 Be6 12.a3 Bxc3 13.Bxc3 Rc8 14.Bf3 Qb6 15.h3 Rfd8 16.Nd2 Nd4 17.Bxd4 exd4 18.b4 Qc7

3. = (0.16): 5.Bd3 Nf6 6.0-0 d6 7.Be3 Be7 8.Nd2 0-0 9.f4 Nbd7 10.Qe2 Nc5 11.N4f3 Nxd3 12.cxd3 Bd7 13.Rac1 Bc6 14.h3 h6 15.Rc3 Rc8 16.Rfc1 d5 17.Ne5

May-24-19  goodevans: <dumbgai: Could also have been a slightly tougher puzzle starting two moves earlier.>

No, it couldn't.

(See my earlier post.)

May-24-19
Premium Chessgames Member
  jes47: In the game black blunders with 23...axb5. Much stronger is 23...Rxc3, and now stockfish gives 24.♗d3 axb5 25.♘d4 ♔e7 26.h4 ♘h3 27.♖b1 ♗g2 28.♖xb5 ♖c8 29.♗xh7 f5 30.♘xf5+ exf5 31.♗xf5 ♔d6 32.♔d2 ♘f2 33.♖b6+ ♗c6 34.♔e3 ♘h1 35.g4 ♔c5 36.♖b3 ♘g3 37.♗d3 ♖e8+ 38.♔f4 ♘e2+ 39.♔g5 ♖g8+ 40.♔f6 with an advantage to black, but the outcome remains in doubt. So the puzzle is fundamentally flawed. There is no obvious win.
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