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Nikolay N Minev vs Ivan Novak
Rimavska Sobota (1974), Rimavska Sobota CSR, rd 13, Apr-??
King's Indian Attack: Symmetrical Defense (A05)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-15-09  gofer: 16 Ncd5 threatening 17 Nxf6+ or 17 Nxc7 winning a piece

A) 16 ... exd5 17 cxd5 winning

B) 16 ... Nxd5 17 Nxd5 exd5 18 cxd5 winning

So now the real question, how does black resolve the pin? Moving the knight loses the rook and so probably loses, so whatelse? I had a look at the rest and it seems that option B is better, but I can't see a clean win in all lines, so I am going to call it a day and admit defeat... :-(

Aug-15-09  patzer2: For today's Saturday puzzle solution, White's 16. Ncd5! combines the clearance, pinning, knight fork, deflection and discovered attack tactical themes/threats to win decisive material.
Aug-15-09  TomOhio: <dzechiel:
19 f4 Bd6
20 Nf6+ Kg7
21 Qxd6 Kxf6
22 Qxc7>

Are you sure that 21.... Kxf6 is legal? I played that same line, but I don't think Black can play that move.

Aug-15-09
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult)

Minev vs I Novak, 1974 (16.?)

White to play and win.

Material: Even. The Black Kg8 has 2 legal moves, both on the back rank. White has a battery Rd1 and Qd2 x-raying Rd8 through the Black Pd7. The Black Rd8 is protected by Qa8 and Nc6, and Bg2 can capture Nc6. The Black Rc7 and Pb6 are loose. The Black K-side has dark-square weaknesses. The White Kg1 is secured from check.

Candidates (16.): Ncd5

I got the game variation to the end, but not trusting my intuition, I missed the full mating implications of 19.f4 if Black permitted capture of his Be5.

Aug-15-09  patzer2: Don't have a Chess program handy today. However, I assume if 16...Nxd5, then 17. cxd5 Bxb2 18. Qxb2 exd5 19. Nxd5 Rcc8 20. Nxb6 winning a pawn and the exchange is sufficient.
Aug-15-09  remolino: 16.? White to play. First lets list the motifs.

Well, the motifs are less evident and strong than on most days, I think:

+ d6 weakness
+ Potential black square weakneses on king side
+ Black rook temporarily misplaced on c7 and undefended, b6 undefended + Black queen a bit removed from the action in comparisson to white's couterpart + Lots of potential energy to white's pieces. The b2 bishop can deliver a discovered attack onto "something" if the cKnight moves

Now, how do we piece all this together? Looked at 16.Qd6 but it is not decisive at all. Direct attacks to b6 do not work. In this position you can almost try every reasonable move, and so, the one that has the most punch is:

16.Ncd5, and this does it

A. 16... exd5, 17.Bxf6 etc
B. 16... Nxd5, 17.cxd5, exd5, 18. Nxd5
C. 16... Rc8, 17. Nxb6

I am not sure I would have seen this OTB since the starting position does not reveal a substantially better position for white and thus the posibility of a combination, at least it is not evident. Maybe in a game with normal controls (but I have not played that in ages), but not in rapid chess...

Time to check...

Aug-15-09  MrMelad: This week has been the easiest for me so far, and I know its not that I'm getting better because my online rating flunked 50 points, so it must be that the puzzles are easier.
Aug-15-09  sfeuler: Would 17... d4 have helped Blacks defense?
Aug-15-09
Premium Chessgames Member
  kevin86: The secret: find two week points-hit both!
Aug-15-09  AugustAle: Is there any problem with trying the ♘ sac @ 15. ? .....


click for larger view

or is the 15.Rfd1 somehow crucial?

Aug-15-09  David2009: Saturday's puzzle Minev vs I Novak, 1974 White to play 16? Very difficult Lightning from a clear blue sky - Black is preparing 16...d5 which adequately counters the trick Ba1, Qb2, Ne4 which is far too slow.

But there is a tactic: 16 Nc3-d5 hoping for 16... exd5 17 cxd5 and Black is in difficulties (not 17...Ne7?? 18 d6, or 17...Nb4?? Qxb4). 16 ...Nxd5 17 Nxd5 Bxb2 18 Qxb2 exd5 19 cxd5 and if 19...Nb4 20 Rxc7 Nxd5 21 Rxb7 seems to win.

I cannot find a good 19th move for Black in this variation: e.g. 19...Rdc8 allows 20 d6 Ne5!? 21 Rxc7 Bxg2 22 Qxe5 Bh1 23 f3; or 20...Nb4 21 Rxc7 Bxg2 22 Rxc8+; or finally 21 ...Rxc7 22 dxc7 Bxg2 23 c8=Q+ etc. No time for more: analysing in time trouble, post and hope
======

Aug-15-09  wals: [Event "Rimavska Sobota"]
[Site "Rimavska Sobota"]
[Date "1974.??.??"]
[Round "13"]
[White "Nikolay Minev"]
[Black "Ivan Novak"]
[Result "1-0"]
[ECO "A30"]
[Annotator "Rybka 3 1-cpu (30m)"]
[PlyCount "37"]

A30: Symmetrical English: Double Fianchetto and Hedgehog

1. Nf3 Nf6 2. g3 2... g6 3. b3 3... Bg7 4. Bb2 4... O-O ( 4... d6 5. e3 ) 5. c4 (5. Bg2 d5 ) 5... c5 (5... d5 6. cxd5 Nxd5 7. Qc1 ) 6. Bg2 Nc6 (6... d6 7. O-O ) 7. O-O (7. d3 d6 ) 7... b6 (7... d6 8. d4 ) 8. d4 (8. Nc3 Ne4 ) 8... cxd4 (8... e6 9. Nc3 ) 9. Nxd4 Bb7 10. Nc3 (10. Re1 Rc8 ) 10... Rc8 (10... Qb8 11. Nf3 ) 11. Rc1 (11. Qd2 ) 11... a6 ♙revents intrusion on b5 (11... d6 12. Nxc6 Bxc6 13. Qd2 ) 12. Qd2 (12. Re1 Na5 ) 12... Rc7 (12... Na5 13. e4 ) 13. Nc2 (13. Nf3 ) 13... Qa8 (13... Na7 14. Ne3 ) 14. Ne3 (14. Nd5 Nxd5 15. Bxg7 Kxg7 cxd5 Na7 ) 14... e6 Covers d5 (14... Nb4 15. Na4 Bxg2 16. Nxg2 (16. Qxb4 Bxf1 17. Rxf1 b5 18. Bxf6 Bxf6 (18... bxa4 19. Nd5 (19. Qxe7 fails because of Re8 20. Qd6 Rc6 21. Qxd7 Bxf6 ) 19... Bxf6 20. Nxc7 ) 15. Rfd1 (15. Ba3 ) 15... Rd8 (15... Re8 ) 16. Ncd5 Double attack: b6/f6/c7 exd5 17. Bxf6 Bxf6 (17... d4 18. Nd5 Bxf6 19. Nxf6+ (19. Nxc7 Qb8 20. Nd5 Bg7 ) 19... Kg7 20. Qg5 ) 18. Nxd5 Be5 19. f4 (19. f4 Rcc8 20. fxe5 Nxe5 21. Ne7+ Kg7 22. Qf4 Bxg2 23. Nxc8 (23. Qxe5+ is the weaker alternative f6 24. Qd6 Bh3 ) 1-0

The above may be of interest to those seeking help.

Aug-15-09  BOSTER: <Chesstalesfan> <Straightforward, I got it. Now I am trying to find geometry.
Hypotenusas? Orthogonal triangle?>
. This remark is not too nice, and at least has nothing to do with today's puzzle. I guess , if you don't like to read some comments simply skip them.
Aug-15-09  ps40: What about 19...Bd4+?
Aug-15-09  obender71: <AugustAle>: Is there any problem with trying the sac @ 15. ? .....

--------

The problem is that after

15 ... ed
16 Bxf6 doesnt work for
16 ... Bxf6
17 Nxd5 Qd8!

Defending both the bishop and the rook, so it is not an exchange gain but a trade of two pieces for a rook and a pawn.

Aug-15-09  AugustAle: <OB71> Thankyou! Perfect. i see now that its not the 15.Rfd1 at issue but the 15..Rd8 that blocks the egress, No-evak for Ivan's ♕.
Aug-15-09  WhiteRook48: right sacrificial idea, but wrong knight
Aug-16-09  TheBish: Minev vs I Novak, 1974

White to play (16.?) "Very Difficult"

Observations: Material is even, rook on c7 is undefended, b6 is weak and may be a target.

Putting all the above together, I found 16. Ncd5!, which at first glance looks equal, since after 16...exd5 17. cxd5 White will win the piece back, with the c6 knight being pinned. However, there is an important improvement!

16. Ncd5! exd5 (forced, since 16...Nxd5 17. cxd5 Bxb2 18. Qxb2 exd5 (forced) 19. Nxd5 Rcc8 20. Nxb6 wins an exchange and a pawn) 17. Bxf6! Bxf6 (or 17...d4 18. Nd5! Bxf6 19. Nxf6+ Kg7 20. Nd5 Rcc8 21. Nxb6 and again White wins an exchange) 18. Nd5 Be5 (or 18...Bg7 19. Nxc7 wins) 19. f4 and now:

A) 19...Rcc8 20. fxe5 (not 20. Nxb6? Bd4+) Kg7 (or 20...Qa7 21. Qh6! f5 22. Nf6+ Kf7 23. Bd5+ Ke7 24. Qg7#) 21. Nxb6 Qa7 22. c5 Rc7 23. Qg5 and White is two pawns up with an attack.

B) 19...Bd4+ 20. e3 Rcc8 21. exd4 Qa7 22. f5! and White is a pawn up with a serious attack, Black's king weakened by the missing dark bishop (23. Qh6 and 24. Nf6+ are threatened). Black's queen is AWOL!

I think that at least covers the main lines. Time to check.

Aug-17-09  LIFE Master AJ: <<Aug-15-09 <dzechiel> White to play (16?). Material even. "Very Difficult."> Then you give the variation:
<"19 f4 Bd6; 20 Nf6+ Kg7; 21 Qxd6 Kxf6; 22 Qxc7, winning an exchange.">>

One problem. 21...KxN/f6; is illegal.

Aug-17-09  LIFE Master AJ: I found this to be a fairly easy puzzle for this day of the week. <<White to move, (16 . '?').> [Saturday; Aug. 15th, 2009.]>

All of White pieces are pointed at d5, the Black Rook on c7 had "target" painted all over it. White gets to make threats, and for every move, Black only has one real reply ...

The continuation of:
16. Ncd5! exd5T; 17. Bxf6 Bxf6T; 18. Nxd5 (fork) 16...Be5T; 19. f4 Bd6; (forced) 20.Nf6+ Kg7; 21.QxB/d6, only leaves White a Pawn ahead. However, Black's position is horrible. (Bad Pawn structure.) He has to stop and defend his hanging Rook on c7. Then White simply plays Ng4, and turns all of his attention on the Black King ... which has virtually no (real) defenders.

[I thought I had posted on this earlier ... but apparently I had not.]

Aug-17-09  LIFE Master AJ: <<<Aug-15-09>

An Englishman:> Good Evening: Anyone else think this was much easier than Thursday's puzzle?>

I thought it fairly simple and straight-forward. The lack of side variations made it almost boring. Compared to some other Friday puzzles - which I had no clue about, even after staring at the diagram for a seemingly infinite period of time - this one was just too easy.

---> Many others have already pointed out that Nd5 was just screaming to be played.

Aug-17-09  sfeuler: LMAJ - give me your thoughts on 17...d4 for Black. How does White continue the attack?
Aug-17-09  LIFE Master AJ: <<sfeuler> <<The following line was generated with Fritz 11 on my PC, which has "Quad-Core" processors.> (750 MB for the hash tables, about two minutes per move.)> Its pretty straight-forward, I don't think it needs too much explanation.>

RR </= 17...d4?!; 18.Ng4 Bxf6; (The machine 'feels' that this is forced, other moves lose even more quickly.) 19.Nxf6+ Kg7; 20.Nd5 Rcc8; 21.Nxb6 Qb8; 22.Nxc8 Bxc8; 23.e3 dxe3; 24.Qxe3 " ." (White is up a Pawn and the exchange and his attack continues as well.)

A couple of these moves were not the "machine" move. (Sometimes computer moves just don't make sense, at least not to the average human player.) In those cases, I substituted the computer's move for the move that I felt the average (carbon-based) player might play instead.

Aug-18-09  sfeuler: <LMAJ> While I was looking at it yesterday, I couldn't find a way (after 17...d4) for White to take advantage of Blacks tangled men on the QS and his lack of support on the KS. Your 18.Ng4 does the trick. 18.Bxf6 is forced due to the potential Queen/Knight infiltration at h6. Thanks!
Aug-18-09  LIFE Master AJ: <Aug-18-09 <sfeuler> <LMAJ> While I was looking at it yesterday, I couldn't find a way ...> <(see post, above)>>

Your welcome! :)

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