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Yuri Troinov vs Luben S Popov
Bulgaria (1962)
Sicilian Defense: Fischer-Sozin Attack. Leonhardt Variation (B88)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Given 24 times; par: 23 [what's this?]

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Kibitzer's Corner
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Aug-31-08
Premium Chessgames Member
  johnlspouge: Sunday (Insane): White to play and win.

Material: Even. White has a spatial advantage from the wedge Pe5, and Qh5 is aggressively placed against the Black K-side. The Rf1 is placed for a R lift, while Ne5 exerts pressure on Pe6 and can support the P push f5. Ironically, White's main strength is not piece activity, but Black's cramped passivity and the consequent absence of ready K-side defense. In fact, the White Bb3, Nc3, Be3, and Ra1 all require activation. Accordingly, the conjunction of Bb3 and Kg8 on the a2-g8 diagonal suggests a sacrifice to liquidate the central P-chain, to capitalize on Black's backward development.

Candidates (13.): Nxd5, Nxe6

13.Nxd5 (threatening 14.Nxe7+, winning a P)

Because 14.Nxe7+ is check, Black must recapture immediately or passively suffer the loss of a Pd5.

13exd4

I went for 14.Bxd4, missing

14Ndxe5 15.Nxc6 bxc6 16.Be4 g6 17.Qxe5 <Bf8> 18.Rad1 Rxe5 19.Rxd8 Rxe4

leaving Black with B for 2P.

Aug-31-08
Premium Chessgames Member
  johnlspouge: <<stardust762> wrote: La Marche de L'empereur>

This is certainly a pleasant way of describing the combination.

I have a habit to break: missing K decoys with the Q, e.g., Hsu Li Yang vs Nunn, 1992.

Kudos to those who saw the decoy 14.Qxf7+ ;>)

Aug-31-08  parisattack: Great king-hunt game, although I think the combo is more a '3' than a '4'. Interesting how the Sozin and Richter Rauzer Sicilian often turns into a bad French for black...
Aug-31-08  DoctorD: The decoy 14. Qxf7 isn't that hard to spot - and if you think romantically, you will actually waste more time thinking about 13. Qxf7?! - expecting a continual "eat-through" to work 13. Qxf7 Kxf7 14. Nxe6 but 14. ... Qa5! wins and 15. ... Kxe6 draws as 16. Bxd5+ Kf5 17. g4+ doesn't work.

As once notes declining the sac with Bc5 works but the position it leads to is so lost positionally and strategically that I imagine that taking the sac and hoping it doesn't work is the best practical option amongst strong players?

Aug-31-08  akapovsky: what was yesturdays puzzle its highly important alekhine vs who and what year
Aug-31-08  Longbrow: <akapovsky>

Fri 2008.08.29 (White to play. 16. ?)
Alekhine vs Van Mindeno, 1933

Also see <ravel5184>s post below:

Aug-31-08  456: Saturday puzzle Aug-30-08 <35. ...?> Gunsberg vs Chigorin, 1890
Aug-31-08  ravel5184: <akapovsky> Game Collection: Chessgames.com Puzzles 2008.08.01-2008.08.31
Aug-31-08  jovack: I only gave it a few minutes, but I didn't get it. I was thinking about rook lifts, but I was also considering the knight d5 sac to free up e5 for the other knight, but I didnt look deep enough because if I was black there, I would just let white have the pawn advantage and use my next move to stop myself from getting crushed.

After looking at what he played out, I think he could have had mate faster if he swung his knight into e5 on his 18th move. That would allow his dark bishop to mate on f2 (if he makes a dumb move, like move the queen to safety), or the bishop could go on g4, then g3 pawn check followed by knight f4 mate.

or if he pins the e3 bishop with his own dark bishop, g3 check, followed by knight f4 mate

Aug-31-08  aragorn69: Actually, White had an even shorter mate with 18.Ne6!

The point is the only ways to prevent the threat of g3+ and Nf4# involve blocking the g5-square (through either pawn or bishop) and hence allowing 19.Bf2#

Aug-31-08
Premium Chessgames Member
  Jimfromprovidence: I have a small inventory of about a dozen puzzles Ive liberated from the Sunday LA Times from the past few months, if anyone's interested.

The caliber of the chess played is pretty strong for the most part.

The link is below.

User: Jimfromprovidence

Aug-31-08  FizzyY: Wasn't really that insane.

The first moves I looked at were Nxd5, Bxd5, and Nxe6. Then I calculated for like maybe 2 moves, saw Qxf7 followed by check with the bishop and Ne6 later. . .then I felt Black can't escape this.

Aug-31-08  zenpharaohs: I completely don't think I got this one, and I don't agree with the game line (13 ... exd5?). So I went to Rybka 3:

13 Nxd5 Nxd4
14 Nxe7+ Qxe7
15 Bxd4 Nc5

This, Rybka 3 assigns a value of +1.22 at depth 18.

The real kicker is that in the game line, 15 ... Kg6?? is a total blunder (leads to mates - one even faster than the game line). The only alternative, 15 ... Kf8, gives a position which is valued by Rybka 3 at depth 14 as +2.51. That it takes more than a half hour for Rybka to get to depth 14 indicates a lot of complexity, and no likelihood of a single very strong line for either side. So Kg6?? is suicide.

Sep-01-08  Vollmer: 12...Re8 is an unlikely blunder , but the text proves it . 12...Nxd4 or Na5 and the combo disappears. Very instructive example of punishing an error .
Sep-01-08  Longbrow: <Vollmer> That is a key point to this puzzle. All roads lead to f7 after 12♖e8 Also to note after 12 ♖e8 is the Black King is now sole defender for f7, g7, and h7.
Sep-01-08  hkannan2000: <ravel5184> Nice collections. Thanks for the hard work.
Sep-01-08  ravel5184: Wow, you're very welcome!
Sep-02-08
Premium Chessgames Member
  kevin86: I was surprised that the attack could lead to mate.Sacrificing the knight is one thing-the queen quite another indeed.
Sep-02-08
Premium Chessgames Member
  patzer2: For the Sunday August 31, 2008 puzzle solution, White initiates a deep winning pursuit combination with 13. Nxd5!!
Jun-02-09  WhiteRook48: 13 Nxd5!!
Mar-25-12  k.khalil: I don't understand why black played 12...Re8
Mar-26-15  zborris8: A game worthy of great comments, w/<chrisowen> writing in English to boot!
Apr-22-18  Albion 1959: What a deep-sighted move 13.Nxd5! was. White exploits the weakness of the f7 square, which was the soft spot of black's position. Some players at club level might have speculated with Nxd5, followed by Bxd5 giving up a piece for two pawns and a few open lines. I toyed with this possibility, but never even hit upon Qxf7+!!! But this is why I am only a club player and not a Grandmaster!
May-16-19  N.O.F. NAJDORF: I don't think Troinov was a grandmaster either!

I like the finish:

20 ... Kg5
21 Rh4 ##

or

20 ... Kh5
21 Rh4+ Bxh4
22 Bf3 ##

Mar-16-20  Gaito: This is Game number 100 in P. H. Clarke's famous book: "100 Soviet Chess Miniatures", G. Bell & Sons, Ltd., 1963
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