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Lev Psakhis vs Alexander Kochyev
Groningen op (1990), Groningen NED, rd 7, Dec-28
Pirc Defense: Classical Variation. Quiet System Czech Defense (B08)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 23.Ngxf5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Apr-05-08
Premium Chessgames Member
  dzechiel: Aha! Apparently the solution is that you DON'T allow black to trade his queen for a rook and two minor pieces, you make it a rook and THREE minor pieces!

Inspired play by Psakhis, I stopped looking when I saw I was "letting black off the hook" by trading his queen.

Perhaps I can do better tomorrow.

Apr-05-08  D.Observer: Is there something wrong with 25. ... Qxg6?
Apr-05-08
Premium Chessgames Member
  WannaBe: 26. Rxg6 maybe...
Apr-05-08  panthercat: It looks like 25...Qxg6 hastened Black's demise. According to Fritz 10, 25...Kh8 26. Qh5 Ne8 27. Nxf5 Rxf5 28. Bxf5 Be2 29. Bxe6 Bxh5 30. Bd7 Bf3+ 31. Rg2, and White has a big advantage, despite the pin of the rook.
Apr-05-08  012: Friday puzzle <13. ?> Apr-04-08 C Jauregui vs J Souza-Mendes, 1959
Apr-05-08  Samagonka: I just hate crowded boards in a puzzle! All I could see was the importance of clearing the g-file and I knew a knight would have to go for sacrifice. I'm cool with that.
Apr-05-08  rayyan: I calculated all correct...till the queen takes...lol
Apr-05-08  piever: I think I'll start writing down my thoughts when solving the puzzle. I hope this will be more interesting to read than "FIRST!!" or "GOT IT IN ONE SECOND!"

White wants to open the g file, this might be worthy a piece, so I try with: 23 Nxf5 gxf5 24 Bh5 and now black has two possible moves: 24 ... Qg8 (but it looks wrong) and 24 ... Qe6. I'll start with the second one.

After 24 .. Qe6 I have three possibilities:

1) sac the exchange on g7 and then play Qg1 with check, but know I'm a rook down and don't see good ways to continue my attack.

2) 25 Rg6 gaining a tempo with the idea of Qg1 but black plays 25 .. Qxg6 26 Bxg6+ Kxg6 and I'm down in material and don't have an attack any more..

3) 25 Rg3 with the idea of doubling (maybe tripling) heavy pieces on the g-file, but this plan is very slow.

In all this variations the N on d3 is completely useless, so maybe I should sac that knight, but it doesn't seem to work...

Ok, i give up.

Apr-05-08  mworld: lol Dzekiel. I feel for you on that analysis! Reading your responses made me appreciate more how brave this Psakhis guy is!
Apr-05-08  MaczynskiPratten: Wow, you can see why these guys are 2500+. Ngxf5 was obvious on principle but I didn't see 27 Nxf5, nor could I see a clear win after 25..Kh8. I looked at 25 Bh5 instead for a time with the thought of gxh5 26 Ngxf5, then Nd6 and Nef5. Invests less but no clear win.

In the final position Black is still nominally up on "points" (R and 3 minor pieces v. Q and 2P's) but there is a horrendous threat on g7 after 31..Kg8 32 exd7 planning dxe8. Black's alternatives seem to be Rf7, Kf7, Rxa7 and Be2, but none look adequate. I wonder which of these a silicon monster would reckon is best.

Apr-05-08  ianD: Got it
Apr-05-08
Premium Chessgames Member
  kevin86: White's sacfifices open the black defense like a steamroller. His king is soon left to fend off a ferocious attack. Then a little pawn is left to deal the final humiliating blows.
Apr-05-08
Premium Chessgames Member
  Jimfromprovidence: I assumed 25...Kh8; I never would have even considered 25... Qxg6.

Anyway, after 25...Kh8, I figured 26 Qh5, below.


click for larger view

That's as far as I got.

Now I'm lost. I need a chess GPS.

Apr-05-08  Jason Frost: 23. Ngxf5 gxf5 24. Bh5 Qe6 25. Bg6+ Kh8 Qh5 , looks like a fairly easy Saturday.
Apr-05-08  Jason Frost: <Jimfromprovidence> Why are you lost? Anywhere black moves white plays 27. Nxf5 with easy win
Apr-05-08  thefableddavid: *yawn* Is this the best this website can throw at me? Pfft.
Apr-05-08
Premium Chessgames Member
  al wazir: I had 23. Ngxf5 gxf5 24. Bh5 Qe6. After that I wanted to play 25. Rg6, but I didn't analyze it further before peeking.

Here's the analysis (what I like to think the continuation would have been if I had been playing OTB):

A) 25...Qe8 26. Rxg7+ Kxg7 27. Bxe8 Raxe8 28. Qh5, with 29. Rg1 to follow. A clear win.

B) 25...Qf7 26. Rxc6 Qg8 27. Rxc7. White is up two ♙s -- also a win.

C) 25...Qg8 26. Rxc6 Rfc8/Rac8 27. Nxf5. The threat of Ne7 or Nxg7 followed by a push of the center ♙s looks overwhelming.

D) 25...Qxg6 26. Bxg6+ Kxg6 27. Nxf5. If 27...Rxf5, then 28. Qg4+ Kf7 29. Qxf5+ Ke8 29. e6, and white again has a positional and material win. If 27...Kxf5, then 28. Qh5+ Ke6 29. Qg6+ Bf6 30. exf6 Nxf6 31. Re1+ Kd7 32. Bxf6, with a similar outcome.

That leaves (ta-da!) 27...Ne8 28. Qg4+ Kh7 29. Rg1 Rg8 30. Qg6+ Kh8 31. Nxh6.

So I think I can give myself half a point.

Apr-05-08
Premium Chessgames Member
  Jimfromprovidence: <Jason Frost> <Why are you lost? Anywhere black moves white plays 27. Nxf5 with easy win>

Black has a lot of options. It takes a great deal of time to analyze them completely and ascertain black's best move. That's where I got stuck. I don't know what black's best play is.

One option is a bishop sacrifice, 26...Be2?!


click for larger view

White can't play 27 Nxf5 then!

Apr-05-08  Everett: <zooter> Your line <23.Ngxf5 gxf5 24.Bh5 Qe6 25.Qh5 with the threat of 26.Nxf5> has h5 simultaneously occupied by white's Q and B. That's creative chess!
Apr-05-08
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult): White to play and win.

Material: even. White has K-side pressure based on the g-file controlled by Rg1. The Bh4, Pe5, and Pf4 control dark squares near the Black Kh7; Bf3, Ne3, and Ng3, light squares. In particular, the 2Ns are focused on Pf5, and the capture gxf5 makes the Black Qf7 vulnerable to the move Bh5 from the battery, Qd1 and Bf3. White has maximal development: only Ra1 remains inactive, but can move to the K-side in a single move under the right conditions. In addition, the usual conditions for a K-side strike exist, namely, the Black Ba3, Nc7, and Nd7 are essentially out of defensive play on the Q-side, giving White the local superiority a sacrificial attack requires.

Candidates (23.): Ngxf5

23.Ngxf5,

increasing the scope of Rg1 and threatening 24.Nxg7 25.f5 or 24.Bg4.

23gxf5 (or lose a P under unfavorable conditions) 24.Bh5

Black has 2 feasible responses.

(1) 24Qg8 25.Bg6+ Kh8 26.Bxf5 (threatening 27.Bxd7)

Black can sacrifice an exchange with 26Rad1, 26Rfd1, or 26Rxf5, leaving White with R+2Ps vs. B+N and a winning attack fueled by 2 central passers. There are 2 other feasible responses, a dismal retreat 26Nb8, bottling the Q-side up even more tightly than at present, and 26Rf7.

(1.1) 26Nb8 27.Bf6 Rf7 28.Qh5,

threatening 29.Rxg7 Rxg7 30.Qxh6+ and possibly 31.Qh7#.

There is no adequate defense.

(1.2) 26Rf7 27.Bxd7 Rxd7 28.f5,

threatening 29.f6 30.Qg4.

There is no defense leaving Black less than a P down.

(2) 24Qe6 25.Bg6+ (threatening 26.Qh5 27.Bg5 28.Bxh6)

25Qxg6 26.Rxg6 Kxg6 27.Qf3,

threatening 28.Rg1+ 29.Qh5 then 30.Qg6 or 30.Nxf6.

There is no way to defend both Pf5 and Bg7, and once one of them falls, the White pieces pour in.

Time to peek. (No crash and burn <today>.) Time to check the kibitzing. I should fail so handsomely as you, <dzechiel>: initially, I also quailed at throwing more pieces onto the fire with my line (2) 25...Qxg6. The Bh4 made a good anchor for the attack, however, so positionally, it was nearly certain the Q would find a stray piece in Black's Q-side tangle. The calculations <were> reassuring, however.

I was most concerned about refusal of the sacrifice, because Pf4 was loose. I will fire up my 512K Mac and see what it says :)

Apr-05-08
Premium Chessgames Member
  johnlspouge: Toga II 1.3.1 analysis gives 23.Ngxf5 as the best alternative, with 23.c4 a close competitor until ply 15. On refusal of Nf5, e.g., with 23...Ne6, Toga gives

24.Rxg6 Qxg6 25.Bh5

netting the Black Q.

After acceptance of 23.Ngxf5, Toga gives

[ply 15/53, time 01:06, value +2.21]

23...gxf5 24.Bh5 Qe6 <25.Rg6> Nf6 26.exf6 Bxf6 27.Qf3 Ne8 28.Rag1 Qe4 29.Qxe4 fxe4 30.Nf5 Bg5 31.fxg5 Rxf5 32.Rxc6 Rf4 33.Rxh6+ Kg7 34.Rxb6 Rxh4 35.Bxe8 Rxe8 36.Rxa6

Toga valued <25.Rg6> more than 25.Bg6+, which Psakhis and I both chose. Toga valued Psakhis' 27.Nxf5 most of all possible moves, but valued my 27.Qf3 at [ply 15/43+, time 00:37, value +4.09], still enough to win ;>)

Apr-05-08
Premium Chessgames Member
  DarthStapler: I got the first 4 moves
Apr-05-08  wals: Static evaluation: Material is even. White is well advanced into Black's territory.

Dynamic evaluation: Knight taking f5 would expose the King if g6xf5. The g3 knight is preferable as this allows the rook to take part in the action. Another route could be Bg5, if not taken by h6 then Nxf5. Yet another move could be Bf3-h5. Let's try that one.

23.Bf3-h5 ...g6xh5 24.Qxh5 ...QxQ 25.Nxh5

PM:=

First thoughts were best but was poking all around it.

Apr-06-08  znprdx: 23.Bh5 looks good enough....but of course I looked at the Knight sac- however how was I to presume Black would surrender the queen ...something fishy here methinks.
Apr-08-08
Premium Chessgames Member
  patzer2: For the Satuday April 5, 2008 puzzle solution, 23. Ngxf5!! gives White a winning clearance sacrifice to open up a decisive attack on the weakened Black King-side castled position.
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