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Tomi Nyback vs Ulf von Herman
Bundesliga (2009/10), Germany GER, rd 1, Oct-17
Bogo-Indian Defense: Grünfeld Variation (E11)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 4 ·  Later Kibitzing>
Dec-14-09  Nullifidian: I think I know the answer intended (20. ♕xh5), but this line is a little too involved for a Monday, so let's get into even greater complications.

20. ?

White is down a pawn.

Solution:

20. ♖xe6! ♗xe6 21. ♘xe6. Now, 21. ... ♙fxe6?? results in 22. ♕xe6#. Black must retreat the queen, and if 21. ... ♕d7, then White's best chance is 22. ♗f5!, with the threat of Ng7. The pin on Black's g pawn prevents 22. ... ♙gxf5 and ♙fxe6 is met by 23. ♗xe6+, winning the queen.

So there is no chance of Black winning back the minor piece, giving White the exact same advantage as in the probable game line.

Dec-14-09  Dr. J: <al wazir: 20...Rxe1+ 21. Rxe1 h6 22. Bxg6 Qxg5 23. Bxf7+ Kh7 24. Qxg5 hxg5 25. Bxd5. White has a two-P advantage.>

<Formula7: <al wazir> Better is 22.Ndf3! Ne7 23.Nxf7 gxh5 24.Nxd8 and White remains a piece up.>

Not quite correct, I think. Black can still recover the piece by 22 Ndf3 Bg7 23 Bxg6 Bxb2 24 Qxh6 Bg7 25 Bxf7+ Kf8 26 Qh7 Ne7, but now White is a 3rd pawn ahead, so 22 Ndf3 is still a clear improvement.

Dec-14-09  gofer: This wasn't "very easy" for me. I must be tired! (20 Qxh5 h6 seems to hold for white)

20 Rxe6

20 ... fxe6 21 Qxh5 Qxg4 22 Qxg4 winning
20 ... Bxe6 21 Nxe6 winning the bishop as fxe6 22 Qxe6#

Time to check what I have missed on a Monday!

Dec-14-09  YouRang: Got it. Not instantly, but I got it.

The two bishops bearing down on the king position had to be part of the solution, and sure enough, I noticed that if the g6 pawn was out of the way, then Bxh7 would be mate.

Naturally, that brought 20.Qxh5 to mind, stealing a knight since recapturing is death.

Dec-14-09  remolino: 20.Qxh5
Dec-14-09  stacase: I only got 20 Qxh5 because it's a Monday and the rules are to look for a Queen sacrifice. I'm having difficulty seeing where this goes if Black plays 20...h6 instead of tipping the King.
Dec-14-09  A Karpov Fan: got it
Dec-14-09
Premium Chessgames Member
  Once: An unusual monday. We have multiple solutions and a winning line that is rather longer and more complicated than normal.

Okay, the Monday line first. From the starting position:


click for larger view

White has a joyous position. Bishops on adjacent diagonals, a far advanced knight, queen on the same file as the enemy king. And the black king is stalemated. When we see at least some of these on the board, we may, no we must, search for a tactic.

Most of the time, chess is not chessgames.com. Not every position you get in real life has a tactic waiting to be found. But when you have all these plusses, there is a good chance that there is something juicy there. Time to switch into puzzle mode.

The two moves we want to play are legal in pool, but not in chess. The jump shot 20. Bxh7+ would be mate, as would the swerve shot 20. Qxh7+. With mate in the offing, it is okay to sac the big lady, so 20. Qxh5 suggests itself as a way of threatening both mates.

Now we need to spell check our 20. Qxh5 idea. How do we deal with either 20...h6 or 20...Rxe1+ 21. Rxe1 h6?

Fritz comes up with these lines:

20. Qxh5 h6 21. Nxe6 - and white has won a rook.

20. Qxh5 Rxe1+ 21. Rxe1 h6 22. Ndf3 Ne7 23. Nxf7

Two other winning lines to look at. From our starting position, we could also play 20. Rxe6 Bxe6 21. Qxh5 h6 22. Nxe6 gh 23. Nxd8 and white has won a piece without ever allowing Rxd1+.

Or we could go down the line proposed by <sufferingbruin>'s students: 20. Nxe6 fe (20...Bxe6? 21. Rxe6!)


click for larger view

According to Fritzie, white has an advantage of +1.6. Interesting tries from here include 21. Ba6 (to deflect the Bc8 from the defence of e6), 21. Nf3 (intending Ng5 and here we go again) and the crazy looking 21. Rxe6.

Not your typical Monday...

Dec-14-09  cocker: I found this hard for a Monday. The first move is easy to spot, but after al wazir's defence White could easily let the advantage slip on move 22.
Dec-14-09
Premium Chessgames Member
  whiteshark: <Monday? <Monday! >>
Dec-14-09
Premium Chessgames Member
  agb2002: White is a pawn down. Black threatens 20... Rxe1+ 21.Rxe1 Bxg4. The black castle has a number of weaknesses and it is poorly defended. The mentioned threat and the convergence of White's LSB and knight on h7 suggest 20.Qxh5:

A) 20... gxh5 21.Bxh7#.

B) 20... h6 21.Nxe6

B.1) 21... gxh5 22.Nxd8 Nxd8 23.Re8 + - [R vs P].

B.2) 21... Bxe6 22.Bxe6 Qg5 (22... fxg6 23.Qxg6+ Bg7 24.Qxg7#) 23.Qxg5 hxg5 24.Bd3 + - [R].

C) 20... Rxe1+ 21.Rxe1 h6

C.1) 22.Nxf7 gxh5 23.Nxd8 Nxd8 24.Re8 and White has recovered the pawn but this looks like a very modest result.

C.2) 22.Bxg6 Qxg5 23.Bxf7+ Kh7 24.Qxg5 hxg5 25.Bxd5 Bb7 26.Ne4 + - [2P].

The line C would not be possible if we take the rook first, 20.Rxe6:

A) 20... Bxe6 21.Qxh5 h6 22.Nxe6

A.1) 22... gxh5 23.Nxd8 Nxd8 24.Re8 + - [B vs P].

A.2) 22... Qe7(8) 23.Qxd5 Qxe6 24.Qxe6 fxe6 25.Bc4 Kf7 26.Re1 + - [B].

B) 20... fxg6 21.Qxh5 Qe7 (21... h6 22.Qxg6+) 22.Bxg6 h6 (22... hxg6 23.Qh8#) 23.Bf7+ Qxf7 24.Qxf7#.

C) 20... Nf6 21.Qh4 Bxe6 22.Bxf6 Qxf6 23.Qxh7#.

Another option is 20.Nxe6:

A) 20... Bxe6 21.Rxe6

A.1) 21... fxe6 22.Qxe6#.

A.2) 21... Qd7 22.Rxg6+ hxg6 23.Qxd7 + - [Q+B vs N].

A.3) 21... Qc8 22.Bf5 Ng7 (22... Bg7 23.Rxg6) 23.Rxg6 h5 24.Rxg7+ and mate next.

A.4) 21... f5 22.Bxf5 Ng7 23.Rxc6 + -.

B) 20... fxe6 (threatening 21... e5 and ... e4) 21.Be5 Nxe5 22.Rxe5 Ng7 and Black can still oppose some resistance [R vs B+P].

I think I would go for 20.Rxe6.

Dec-14-09  eblunt: After whites best defence, as so succintly put by <al wazir> white is 2 pawns up. I wonder how much better that is than just simply playing 20 ♘x♖ and winning the exchange. Appologies if this adversly affects the comic value of <SufferingBruin's> excellent sketch !
Dec-14-09  paavoh: Thanks CG for taking notice so quickly! <Oct-19-09: This would be a good Monday puzzle!>
Dec-14-09  prinsallan: Out of curiosity: Doesnt 20. Nxe6 aslo put black into serious difficulites?
Dec-14-09
Premium Chessgames Member
  Once: <prinsallan: Out of curiosity: Doesnt 20. Nxe6 aslo put black into serious difficulites?>

Have a look at my post just a little higher up the screen...

Dec-14-09  prinsallan: So what happens in this line...?
20. Nxe6 fxe6
21. ?
What is my best reply, if I dont wish to sac my queen?
Dec-14-09  gtgloner: 20. Qxh5 and if gxh5, 21. Bxh7#, looks pretty straightforward, let's see.
Dec-14-09  VargPOD: I think this is hard for Monday. 20.Qxh5 is easy to find, but after 20...h6 or 20...Rxe1+ 21.Rxe1 h6 the lines are not so obvious, as other posters have demonstrated.
Dec-14-09  CHESSTTCAMPS: White is down a pawn, but is fully deployed and has a winning attack thanks to full control of the h8 diagonal. Black threatens to win the queen with 20... Rxe1+, but white's attack gets in first:

20.Qxh5!

Now a quick checkmate can only be prevented at the cost of major material:

A) 20... gxh5 21.Bxh7#

B) 20... Rxe1+ 21.Rxe1 Bg7 22.Qxh7+ Kf8 23.Q (or B)xg7#

C) 20... Bg7 21.Qxh7+ Kf8 22.Qxg7+ Ke7 23.Qxf7 Kd6 24.Nxe6 followed by Qf4+ or Qc7+/#.

D) 20... Qxg5 21.Qxg5 and white is up a Q for a P.

Dec-14-09  TheaN: Monday 14 December 2009

<20.?>

Target: 0:40;000
Taken: 0:09;679

Material: Black up, ♙

Candidates: <[Qxh5]>

-ML-
It's obvious that White wants a breakthrough with such a major King side attack. After seeing the key move I was kinda surprised that Nxe6 seems to win an exchange outright, but of course:

<20.Qxh5!> is much stronger. This threatens a new mate on h7, and of course a capture leads to the same mate with the Bishop.

/A\
<20....gxh5 21.Bxh7‡ 1-0> showing the domination of the White pieces. If Black, however, plays 20....h6, the story ain't over yet.

/B\
<20....h6> the only effective move to protect against the mate on h7, and suddenly, gxh5 is a major threat. However, with everything en prise, White should be able to pick up way too much material with:

<21.Nxe6 > it's already a piece and Rook, after 21....Bxe6 the Queen retreats, and 21....gxh5 22.Nxd8 Nxd8 nets a Rook. This leads me to believe Black wants to remove his own Rook first.

/C\
<20....Rxe1 21.Rxe1 h6> different position, and the same trick doesn't work as the Rooks are already traded. However, Rxe1 removes the Rook as important defender, and I guess that breaking through leads to a dominant position.

<22.Bxg6!> anything leads to mate next move unless Black either blocks the diagonal or captures the Knight. The latter is definitely best.

<22....Qxg5 23.Bxf7† Kh7 24.Qxg5 hxg5 25.Bxd5 > seems enough, but I guess that this is a bit too much for Monday. Time to check what's best.

Dec-14-09
Premium Chessgames Member
  Once: <prinsallan> This is the position after 20. Nxe6 fe


click for larger view

Now Fritz 11 thinks that four moves are all about equal value - each giving white an advantage of around about +1.5 - ie a pawn and a half or a knight for rook exchange.

21. Nf3 Ng7 22. Ng5

21. Rxe6 Bg7 22. Bxg6

21. b4 Bd7 22. Rc2

21. Ba6 Ng7 22. Bxc8

As I have been typing this, the eval for 21. Nf3 has risen to +1.9 (nearly two pawns), so that looks to be the best move. 21. Rxe6 has fallen to 1.22 (I never did like the look of that move). But there is nothing clear-cut. White still has work to do, admittedly with a nice edge.

Dec-14-09  TheaN: 1/1

Looks like I got the two pawn variation and I guess it justifies for a Monday. Kudos to those going on to find a more solid advantage for White. This is NOT a Monday puzzle if it involves 20....Rxe1† 21.Rxe1 h6. Black's resignation is too early.

Dec-14-09  prinsallan: Thanks <Once>. Felt like a rather solid attack from white. The king has found himself in a rather serious situation. I think I would win this against an equal opponent.
Dec-14-09  VincentL: 20. Nxe6 wins material.

On 20.....Bxe6, 21. Rxe6 and black cannot play 21... fxe6 on account of 22, Qxe6 nate,

Is this what we are meant to see?

Dec-14-09
Premium Chessgames Member
  chrisowen: The time is nigh, back to good old mondays. Got sight of 20.Qxh5 a mile off. Jog in the queen at a pace, make her take on h5. Attack the h7 pawn is the card I ought to topple so Rxe1 Rxe1 h6 and scanning the options probably the greatest likelihood of the point is Ndf3 would've stroked it in.
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