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Jon Ludvig Hammer vs Martin Zumsande
Rilton Cup (2016), Stockholm SWE, rd 9, Jan-05
Zukertort Opening: Queen Pawn Defense (A06)  ·  1-0

ANALYSIS [x]

FEN COPIED

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sac: 21.Nxe8 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Jun-11-17  mel gibson: I didn't see that.
The computer says:

20. Nxg7 (20.
Nxg7 (♘f5xg7 ♗f8xg7 ♗h3xc8 ♖e8xc8 ♗d4xf6 ♘c5-e6 ♗f6xg7 d5-d4 ♘d2-c4 ♕a5-h5 f2-f3 ♔g8xg7 ♖a1-e1 ♖c8-d8 ♕b2-e2 h7-h6 ♕e2-d3 ♗b7-c6 ♖e1-e5 ♘e6-g5 ♖e5-f5 ♕h5-g6 ♖f1-d1 f7-f6 ♔g1-f2 ♗c6-b7 ♔f2-g2 ♘g5-e6 ♔g2-h1 ♗b7-d5) +1.67/20 192)

score for white +1.67 depth 20

Jun-11-17
Premium Chessgames Member
  PhilFeeley: I saw Nxg7, but the follow-up is pure madness.
Jun-11-17  mel gibson: It's interesting how Black gives a Queen check instead of taking the knight on g7 with the bishop. It looks like a good move but it's not.
That's chess - it was brilliant for white to see that he can sacrifice his queen to win.
Jun-11-17  kungfufighter888: Black Queen look out of position.
Jun-11-17  Walter Glattke: I found a final mate with 27.-d4 28.Bxd4
Qf5 29.Rg8+ Kh6 30.Be3+ Bf4 31.Bxf4+ Qxf4 32.gxf4 Bd6 33.Rh8 a5 34.Rxh8# White wins the quality with 20.Nh6+ gh6 21.Bxc8 Bxc8 22.Bxf6 Rc6 (23.Qd4 Rxf6 24.Qxf6 Bg7!) 23.Rae1 Nd3 R for B
Jun-11-17  diagonalley: wibble wibble wibble...
Jun-11-17
Premium Chessgames Member
  agb2002: White is one pawn down.

White can use five pieces to attack the black king.

An attempt to incorporate the rooks suggests the fantasy line 20.Rae1 Nd3 21.Rxe8 Nxb2 22.Ne7+ Kh8 23.Nxc8 + -. However, Black can play 20... Rxe1.

White has Bxf6, Nxg7 and Nh6+.

The dominance of the diagonal a1-h8 suggests 20.Nxg7:

A) 20... Nd3 21.Nxe8

A.1) 21... Nxb2 22.Nxf6+ Kh8 (22... Kg7 does not allow an eventual Bg7) 23.Nh5+ (to avoid the pin) 23... Kg8 24.Bxc8 Bxc8 25.Bxb2 + - [2R+2N vs q+b].

A.2) 21... Rxe8 22.Qc2 Ne5 (due to Qxd3 and Bxf6) 23.Qf5 seems to win decisive material.

A.3) 21... Nxe8 22.Qb1 wins decisive material.

B) 20... Bxg7 21.Bxf6 Bxf6 22.Qxf6 and white has the better position (threatens Bxc8 and the maneuver Nf3-d(h)4-f5).

-----

In the case of 20.Nh6+ gxh6 (20... Kh8 21.Nxf7+ wins an important pawn) 21.Bxf6:

A) 21... Nd3 22.Qd4 with many threats (Qg4+, Qxd3, Bxc8).

B) 21... Rc7 22.Nf3 with the idea Nd(h)4-f5.

-----

I'm not sure and don't have time for more but I'd probably play 20.Nxg7.

Jun-11-17
Premium Chessgames Member
  morfishine: Craziest combination I've ever seen, and that includes Super-Nez

*****

Jun-11-17  gofer: Okay, the queen sacrifice is easy to see, but any alternative for black, than accepting it, was not.

<20 Nxg7 Ne3>

<21 Nxe8+ Nxb2>

<22 Nxf6+ Kg7>

<23 Bxc8 Bxc8>

<24 Bxb2 ...>


click for larger view

This is a nightmare for black! An open king side. 4 pawn isolani compared to 2. A discovered check already created and down 2R+N v Q to boot...

So after only a minute or so (which is unusual for a Sunday) and being decidedly lazy I clicked...

...black should have played something else...

~~~

Yep! Perhaps black should have played <20 ... Bxg7>

Jun-11-17  Iwer Sonsch: Material is equal.

20.Nh6+ gxh6 21.Bxc8 and 22.Bxf6 looks like a Tuesday.

So what am I missing?

Jun-11-17  Iwer Sonsch: After 20.Nh6+ gxh6 21.Bxc8 Bxc8 22.Bxf6, Black can equalize with 22...Bh3! 23.Rfd1 Nd3 24.Qd4! (24.Qc2? Nxf2! 25.Kxf2? Qb6+! #4) Qb5! 25.Nf1 Bf5


click for larger view

That Knight is annoying enough for the position to be completely equal, regardless of the exchange difference (0.00 @depth 28). Also, Black is threatening 26...Bc5!.

Awesome Sunday Spoiler.

Jun-11-17
Premium Chessgames Member
  thegoodanarchist: I got it! I got the Sunday puzzle.
Jun-11-17  Walter Glattke: Sorry, but in the puzzle diagram the black queen is not at b5, there is Qa5.
Jun-11-17  Iwer Sonsch: <Walter Glattke> Were you talking to me? 24...Qb5! gets the queen there.
Jun-11-17  Walter Glattke: Ok my mistake.
Jun-11-17  King.Arthur.Brazil: It is a good problem, but sorry, this time, the move is not insane, since white win the Nf6, attacks the Nd3. After all foreseen changes, white has 2N+ 1B+ 2R agains't 1Q +2B. Therefore, white has winning material and the black treat of Q g2 is easy to avoyd, but for the treat with Rg8 black has no answer. So the move is quite logical and I see it immediately.
Jun-11-17
Premium Chessgames Member
  kdogphs: First try! Getting better at this.
Jun-12-17  stst: Almost time...9pm CA then next day ...

Try the "rubber band horse" attack:
16.Nh6+
IF (A).......gxN, 17.BxN(f6) d4 (try block the Q, then guard it by N or R though none works, 18.Qxd4 if R(either one)d8, BxR, or if Ne6, B@a3xN. Suppose Ne6, 19.BxN RxB, 20.Qg3+ Bg7, 21. QxR and White is up a lot in material.

IF (B)....Kh8, then "rubber band horse" ignites..17.Nf7+ Kg8, 18.Nh6+ gxN (cannot tolerate anymore?) 19.BxN... the rest is clear.

See how the game plays out.

Jun-12-17  stst: The game adopts another kind of rubber band horse attack... but not that pretty.
Jun-12-17  Moszkowski012273: Damn... Got the first SEVEN moves,,,only to miss the eighth.
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