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Ovidiu-Doru Foisor vs Sergey Borisovich Smagin
Nimes op (1991), rd 2
Nimzo-Indian Defense: Classical Variation. Keres Defense (E32)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Apr-12-08
Premium Chessgames Member
  dzechiel: White to move. Material even. "Very Difficult."

Makes you wonder how that black rook got to b3. Shouldn't it have been the queen's rook? The game will be interesting.

With a large number of black's pieces stuck on the queen side (both rooks, a bishop and a knight), it seems that an assault on the king is in order for white.

Let's try to pick out some candidate moves. There's

- 30 Nxh6+
- 30 Nf6+
- 30 Rxe6
- 30 Bf6

I think it's a combination of these moves, and that the order is important. First let's go for

30 Rxe6 Nxe6

Or else black just loses a pawn and has a lousy position to show for it.

31 Qg6

This has a couple of threats, namely 32 Nf6+ (picking up the queen) and 32 Rxe6. Even 32 Nxh6+ and if 32...Kh6 then 33 Nf7+ and 34 Ng5 looks promising.

What can black play? Not 31...Ne7 because 32 Nf6+ Kf8 (32...Kh8? 33 Qh7#) 33 Nxd7+. And not 31...Qf7 32 Nxh6+ and 33 Nxf7. The only move that saves the knight appears to be

31...Nf8

But this allows

32 Nf6+ Kh8 33 Re8

threatening both 34 Rxf8# and 34 Qh7#. Black must give up the queen with

33...Qxe8 34 Qxe8

and after

34...gxf6 35 Qxf8+ Kh7 36 Qf7+ Kh8 37 Bxf6#

is mate.

I'm sure there are a lot of lines I'm not looking at, but it's 1:30a, and I'm done for this evening.

Time to check.

Apr-12-08  Chris1Clark: dzechiel. Really enjoy your posts. They are very insightful and written well, thank you very much. This one stumped me I wanted a bit more prep prior to launching the attack with Qd2 and the use of subsequent threats of putting the Knight on that lovely forked sq f6 was always part of a plan. Looked at the actual move but couldn't get see the line that included 31. Nxh6 this was miles away from anything I could see.
Apr-12-08  stukkenjager: Unbelievable, what a crushing attack, and there is no defence.
Apr-12-08
Premium Chessgames Member
  DarthStapler: I got the first move
Apr-12-08  KarAkter: Good day to everyone!Decisive mistake was 25...f6?!.Better was Rab8,and on 26.Qb1 Rab6 27.Ld3 Ra3 28.Lh7 Kf8 29.Lc2 Re3 30.Re3 Lc4 or on 26.Qc1 Qd7 27.ed6 Ncd6 28.Ld3 Ra8 29.Le4 Lb7 30.Qd1 Ra6...,but anyway white is still much better
Apr-12-08
Premium Chessgames Member
  whiteshark: I got <30.Rxe6 Nxe6 31.Qg6> and now my line continued 31...Nf8 32.Nf6+ Kh8 33.Re8 and due to # black has to play 33...Qxe8 34.Qxe8 and white is winning.

I didn't calculate 31...Kf8 but <32.Nxh6!!> is great as it is clearing sq f6 for the decisive ♖xe6-f6+.

Apr-12-08  stupidiot21: great game
Apr-12-08
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult): White to play and win.

Material: B for N. White has a battery Re1 and Re2 on the e-file against Pe6. His Qc2 is active, attacking the light squares near the Black Kg8; Ng4 and Bh4 attack the dark squares. The Black Pg7 must protect against the move Nf6, forking Qd7 and Kg8, so Bh4 may occupy f6 with impunity. The Black Nf8 must protect the light squares around Kg8, to prevent the moves Qg6 and then Nf6+. Only the White Bf1 needs to be activated.

Candidates (30.): Rxe6 (deflecting Nf8)

30.Rxe6 Nxe6 [else, drop a P and permit invasion by the Rs]

Candidates (31.): Qg6, Rxe6

31.Qg6 (threatening 32.Nf6+ then 33.Nxd7+ or 33.Qh7#)

To meet the threats, Black must move Kg8, because moves with Ne6 or Qd7 are ineffective.

(1) 31Nf8 32.Re8 Qxe8 33.Nxh6+ Kh8 34.Qxe8 (threatening 35.Qxf8+)

34Nb6 [gxh6 35.Qxf8+ Kh7 36.Qf7+ Kh8 37.Bxf6#] 35.Bd8 Kh7 36.Qxf8

36Kxh6 [gxh6 Qf7+ and mate soon] 37.Qxd6+ K moves 38.Bxb6

leaving White with Q+B+3Ps for 2Rs.

(2) 31Qf7 32.Nh6+ winning Qf7.

(3) 31Q other feasible move 32.Rxe6,

threatening 33.Re8# and if Nc8 moves, 33.Re7 and mate soon, so there is no feasible defense.

The Kg8 has 2 legal moves.

(4) 31Kh8 32.Rxe6

threatening 33.Re8#, 33.Nf6 gxf6 [else, 34.Qh7#] 34.Bxf6+ Qg7 35.Qxg7#, and 33.Re7

There is no feasible defense.

(5) 31Kf8 32.Nxh6 (threatening 33.Qh7 34.Qh8#)

Black cannot accept the sacrifice, which takes the critical defensive square f7 away from Qd7:

32gxh6 33.Rxe6 (threatening 34.Rf6+ and mate soon)

33Ra7 34.Rf6+ Qf7 35.Rxf7+ Rxf7 36.Qxh6+

White emerges with Q+2Ps and the initiative against an open K for 2Rs, so Black must refuse the sacrifice. To prevent the threat in 32.Nxh6, Black cannot prevent 33.Qh7 with 32Ng5 33.Bxg5, so he must prepare to play 33gxh6.

32Ra7 [or Nb6] 33.Rxe6 (threatening 34.Qf4+)

Because 33gxh6 is a transposition of a previous losing line, and because of 33Ne7 34.Qf7#, Black can resign.

The key to the solution is the follow-up 32.Nxh6. The position demands denial of 2 key defensive squares, f7 to Qd7, and e7 to Nc8. White must delay capture of Ne6 in favor of 32.Nxh6, which contains enough venom to accomplish the 2 objectives.

Apr-12-08  Samagonka: Not really "very difficult" if one has the time and patience of a dzechiel or a johnlspouge. Not forgetting that extra portion of audacity of course ;>
Apr-12-08
Premium Chessgames Member
  kevin86: A funny ending-piecewise,the players are about equal. It is the massive pawn edge and the superior deployment of the pieces the decide this one.

Funny how some of these sacrifice games go-the sacker often winds up AHEAD in material-Doesn't that make it an investment rather than a sacrifice? JW

The problem I have with sacs is that I am left with too few pieces to win with-I guess that could be called "charity" rather than sacrifice-lol

Apr-12-08  znprdx: 30.Bf6 is interesting as...e5 forces surrending the Bishop for the pair of pawns ... this would be a puzzle theme I guess... but OTB Id get into time trouble looking at: 30.Rd2 which seems strategically best.... h5 31.Nf2 with the idea Ne4 Another cute idea is 30.g3 with the plan Bh3 or 30. Rd1 planning Bf2 seems slow 30.Nf2 looks solid R[a]b8 31.Nd3 d5 32.Rd2 d4 33.Ne5 and Im out of my depth. Sigh weaker players always consider too many variations. Strong players see what is best and make it happen. I give up.......oh good grief neither .... 31Bxc4 nor 31....Ne7 work ...very nice... just when I was feeling my skills were improving.
Apr-12-08  Anatoly21: Gotta admit, that was relatively easy for a Saturday puzzle. Normally these babys rack my brain, but this one just seemed so easy. Dumb luck perhaps . . .
Apr-12-08
Premium Chessgames Member
  Eyal: <KarAkter: Decisive mistake was 25...f6?!>

It might have been, had White played 27.Ng4! with a big advantage (27...Nxg4 28.Qg6!). But since White played inaccurately with both 27.Bh4 and 28.Ng4, Black could have held with 29...Qe8, (over-)protecting g6; so I think 29...Qd7? should be considered as Black's decisive mistake.

But even after 30.Rxe6, Black's position doesn't have to fall apart immediately as in the game - he can still put up a more stubborn resistance with a deflecting rook sacrifice of his own: 30...Rxb2(!) 31.Qxb2 Nxe6.

Apr-12-08
Premium Chessgames Member
  Eyal: Hmmm - however, in case of 30...Rxb2 White doesn't have to capture the rook, he's still easily winning after 31.Qf5.
Apr-12-08
Premium Chessgames Member
  Breunor: Where do all of you think black went wrong? To me, it seemed he got a little too fancy with the knight moves. I also didn't understand why he played Rc8 on 20 and them Rcb8 on 22?

I thought he would play 18 ... Ne4 which simplifies.

Any help on this is appreciated, since the puzzles are way over my head anyway!

Apr-12-08  wals: Static Evaluation: White is up a dark diag. bishop for a knight. Appears to have the better attacking potential.

Dynamic Evaluation: Knight moving to f6+ would necessitate g7 taking f6 or losing the Queen. That exposes the black King but how to take advantage of that? Taking f6 with the Bishop helps but doesn't allow the white Queen to engage because of knight on f8. Solution,attack e6 with Rooks to deflect Nf8.

Dynamic Assessment: Reasonable moves, Rxe6, Ng4-f6,

30.Rxe6 ...Nxe6 31.Ng4-f6+ ...gxf6 32.Qg6+ ...Kh8

33.Bxf6#

PM=

Well, I got a couple of moves right. Yes I see my blunder now,32. ... Qg7, torpedoes my line and leaves me floating belly up, dead in the water, -3.49.

Apr-12-08  SolaGracia: Knowing that this was a puzzle makes the initial analysis much easier.

I knew from the looks of the position that the Rook and the Knight would probably be sac'd. I also wanted to take advantage of the Royal Fork with the Knight. I was thinking something like:

30. Rxe6 Nxe6
31. Nf6 gx6 (by necessity, to save the Queen)

32...Kh8 33. Bxf6# (too easy)

<or to prevent mate>

32. Qg6+ Kf8 33. Qxh8+

At this point Black has only a few moves to choose from and cannot escape to the Queenside because of the dark squared bishop on h4. I could see 3 possibilities.

33...Kf7 34. Qxf7+ followed by ?

33...Ke8 34. Rxe6+ Ne7 35. Rxe7+ Qxe7 36 Qxe7#

33...Kg8 34. Rxe6 followed by ?

This is about as far as I can go without making the moves on a board.

Did anyone else head down this path of analysis? Obviously the real moves were stronger...

Apr-12-08
Premium Chessgames Member
  dzechiel: This game looks like it was adjourned, with move 41 for white sealed, and never continued. Just a guess.
Apr-12-08  GibGezr: Yes, SoloGracia, I went down the EXACT same path as you. Thought I had a Saturday puzzle solved, darn it!
Apr-12-08  234: Friday puzzle <20. ?> Apr-11-08 J L Arnason vs Nunn, 1990
Apr-12-08
Premium Chessgames Member
  benveniste: <Eval>, white also has the option to accept the temporary rook sac ♖xb2 and answer with a temporary queen sac!

30. ♖xe6 ♖xb2
31. ♕xb2 ♘xe6
32. ♕f6! gxf6
33. ♘xf6 K-moves
34. ♘xd7

Apr-12-08  Halfpricemidge: I thought it was 30 Bf6 gxf6 31 Nf6+ forking the queen. If 30 Bf6 Nb6 31 Bxg7 Qxg7 32 Rxe6 Nxe6 33 Rxe6 Threatening 34 Rg6.
Apr-12-08  RandomVisitor: After the improvement 28.Bd3:


click for larger view

(16-ply) Rybka 2.3.2a
1. (1.91): 28...Bb7 29.Bh7+ Kh8 30.Nf5 Nf8 31.Nxg7 Qd7 32.Nxe6 Qxh7 33.Nxf8 Qxc2 34.Rxc2 Kg8 35.Ne6 Rb8 36.Nd8 Ba8 37.Bf6 Nb6 38.f4 Rd3 39.f5 Nd7 40.Re8+ Nf8

2. (2.03): 28...Rxd3 29.Rxd3 Ra7 30.Rd2 Nf8 31.Red1 Rd7 32.Bg3 Bb7 33.h3 Nh7 34.Qg6 Nf8 35.Qg4 Qb6 36.Be5

Apr-13-08
Premium Chessgames Member
  Eyal: <benveniste: white also has the option to accept the temporary rook sac Rxb2 and answer with a temporary queen sac! 30.Rxe6 Rxb2 31.Qxb2 Nxe6 32.Qf6! gxf6 33.Nxf6 K-moves 34.Nxd7>

Yeah, 32.Qf6 is a "spectacular" move - but note that at the end of this line White remains with only a pawn up, so 31.Qf5! is actually much more effective than Qxb2.

Apr-14-08
Premium Chessgames Member
  patzer2: For the Saturday April 12, 2008 puzzle solution, 30. Rxe6!! sacrifices the exchange for a winning attack against Black's helpless King after 30...Nxe6 31. Qg6! .
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