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Eugene Znosko-Borovsky vs Moritz Lewitt
Ostend (1906), Ostend BEL, rd 6, Jun-11
Colle System (D05)  ·  1-0



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sac: 25.Nf6+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Sep-11-08  goodevans: I guess I can answer my own question ...

I thought that 26 ... h5 could be answered with 27 Rg5, but then 27 ... Qxh3 seems to lead to a draw.

Sep-11-08  openingspecialist: <Woody wood pusher> of course! i never thought to sack the exchange back so quickly. I was thinking about it in the "drawish" position i showed.
Sep-11-08  YetAnotherAmateur: The variation that caused me to reject the move played in the game: 25. Nf6 Rxf6
26. gxf6 Bg6
and now while white has a material advantage I saw no way for white to exploit that advantage.
Premium Chessgames Member
  chrisowen: For nearly a century white has handled the colle with nice timing. 20. e5 would've carved out a headache but 25..Nf6! soothes my sore temples. Here it is handi coordination of three pieces that stuff black.
Sep-11-08  TheCap: < Woody Wood Pusher: < TheCap: 25. Nh6 gxh6 26. gxh6 Kh8
27. Rg5 Qf7
28. Rhg3 and mate in 6>


I'm afraid that just loses you the knight for no decisive attack.

27...Qf6 28. Rg3, Be7 and you have nothing - + >

Well, at least my humor worked...
Have a nice day & greetings from Down Under

Premium Chessgames Member
  OhioChessFan: Fairly easy for a Thursday. I was like Cap and wanted to play Nh6 first. That just looked more like a puzzle move.
Premium Chessgames Member
  Once: <MostlyAverageJoe: <Once: 25. Nh6 gh 26. gh+ Kh8 looks tempting, but then what do we do?> How about 27. Qh6 to keep the vulnerable h7 pawn in place, with the idea of bringing the rook to g7. Looks rather deadly.>

This is the position at the end of the line I suggested ...

click for larger view

So now you want to play 27. Qh6, eh?

That's okay - black has a perpetual with 27 ... Qxe4+(!?@) 28. Rg2 Qg1+

Only joking!

Sep-11-08  whiteshark: After <25.Nf6 Kf7> (best answer) <26.Nxh7 Qg6 27.Nxf8 Bxf8> white is ♖♙ vs ♗ up but the position is so blocked the material doesn't mean that much. [Remember Rook require open files to develop their power!] A longterm win.

click for larger view

Premium Chessgames Member
  Once: .... except that's not a perpetual, is it? White plays 29. Kxh2 and black's checks run out.
Sep-11-08  MostlyAverageJoe: <Once: <MostlyAverageJoe: <Once: 25. Nh6 gh 26. gh+ Kh8 looks tempting, but then what do we do?> How about 27. Qh6 to keep the vulnerable h7 pawn in place, with the idea of bringing the rook to g7. Looks rather deadly.> This is the position at the end of the line I suggested>


Attacking with Nh6 did not cross my mind when I looked at the puzzle so I guess I translated h->f in your post.

Your line can be improved, though. White can play Kxh2 immediately after Qxe4+, no need to wait extra move and move the rook for no good reason :-)

Sep-11-08  YouRang: Phfft. I thought I found something good in 25.Nh6+. It turned out to be just a mirage.
Sep-11-08  kevin86: After 26...♔h8 27 ♖g6 ♕xh3 (▢,to escape mate) 28 ♕xh3 ♖xf6...

White would be ahead a queen and pawn for rook and bishop...if black lasts the middlegame,a draw is possible but not likely.

Sep-11-08  VooDooMoves: Hey all. What a fascinating position! At first I thought white could win at leisure with whatever move but upon closer inspection I found it's not easy at all! I found 3 candidates: 22. Nh6+, Nf6+, and g6. Even though I didn't find the answer in the time i allowed myself I will post my analysis in the hopes that it will help, although I doubt it as I didn't use the silicon monster :)

1) 22. Nh6+ gxh6 (necessary as white was forking king & queen) 23. gxh6+ Kh8 (23...Kf7? 24. Rg7#) and now that the h-file (white's biggest asset) has been closed I see no way of continuing the attack.

2) 22.Nf6+ (this move has the same point of opening the g-file but the reply is not forced so black has other ways to handle it)

2a)22...gxf6 23.gxf6+ Kh8 24.Rg5! and white takes away the only 3 squares from which the queen can guard h7. So, 24...Bg6 (best as others allow mate) 25. Rxf5 and white wins queen for 2 pieces.

2b) 22...Rxf6 23. gxf6 Bg6 (23...Qxf6? 24. Qxf6! wins the queen as the g-pawn is pinned and 23...g6? 24. Qxh7+ Kf8 25. Qg7#) and black holds.

2c) 22...Kh8 23. Nxh7 Bg6 24. Nf6+ Bh7 25. Qxh7+ Qxh7 26. Rxh7# Since both knight checks let black escape with accurate defense I moved to my last candidate...

3) 22. g6 This pawn advance produced some exciting analysis:

3a) 22...hxg6 23. Qh7+ Kf7 24. Nh6+ and black loses the queen to this fork as the g-pawn is pinned.

3b) 22...Qxg6 23. Nh6+ and again the queen is lost. The knight check discovers an attack on the queen and if 23...Qxh6 24. Qxh6 again wins as the g-pawn is pinned, this time the other way!

3c) 22...h6 23. Nxh6+ gxh6 24. Qxh6 Rf6 (both 24...Bg6 or 24...Qg6 allow Qh7 Mate!!) 25. Qh7+ Kf8 (the point of blacks 24th) 26. Qh8+ Ke7 27. Rh7+ Kd8 and black wiggles out of danger. So, I didnt find the solution, however I did have fun trying!!

Sep-11-08  VooDooMoves: oops! start all my analysis with 25 instead of 22 plz :)
Sep-11-08  lost in space: A puzzle without participation of <dzechiel> is not really complete....
Sep-11-08  dzechiel: White to move (25?). Material even. "Medium."

Sorry to get a late start, but my family took me into Los Angeles last night to see a play, and we didn't get home until very late.

Looking at today's position, it seems obvious that white needs to open the g-file in order to get the attack up to speed. The first thought is 25 Nh6+ as this is very forcing, however after 25...gxh6 26 gxh6+ Bg6 it appears that white has now self blocked the h-file and the attack will run out of steam.

So, it seems that the right way to sac the knight is

25 Nf6+

Now black has five legal replies (some better than others):

- 25...Kh8
- 25...Qxf6
- 25...Rxf6
- 25...Kf7
- 25...gxf6

Let's deal with them. The worst of the bunch is

25...Kh8 26 Qxh7+ Qxh7 27 Rxh7#

Only somewhat better is

25...Qxf6 26 gxf6

and black is down a queen with a lousy position. Then there's

25...Rxf6 26 gxf6

and black is down an exchange and still has a lousy position.


OK, this is a much better try. It looks like the black king will make a run for it, how can white take advantage?

26 g6+

White gets in a little zwischenzug before moving the knight to h7. Black can move the king or take with the h-pawn, but g5 is now available for the white rook. Let's try

26...hxg6 27 Nh7

On the black rook.

27...Rh8 28 Rg5

and black will go down a queen for a rook. OK, lastly there's the move that makes it all interesting

25...gxf6 26 gxf6+

Once again black has several legal moves:

26...Qg6 or 26...Bg6 allow 27 Qxh7#

26...Kf7 27 Rg7#

26...Qg5 or 26...Qg4 allow the rook capture with check. Ugh.

26...Kh8 27 Qh6

This was the hard move to find IMHO. The threat is 28 Qg7#. The only good way to stop this is

27...Rf7 28 Rg7

Now the threat is 29 Qxh7+ Qxh7 20 Rxh7#. I think at this point that black has to give up the queen with

28...Qxh3 29 Qxh3 Rxg7 30 hxg7+ Kxg7 31 Qxe6

on the bishop and the d-pawn. I think the advanced black pawns will fall like ripe apples and white will win in the endgame.

At any rate, it's well beyond time to check.

Sep-11-08  marekg248: dzechiel i'm glad you made it, love to read your posts.
Sep-11-08  VooDooMoves: Ditto
Sep-11-08  vanytchouck: The key of the position (wich i've missed several times before) :

When the bishop will be on g6, it won't protect the h7 square as it will be pinned by the Rg1 !!!

The move Bg6 annoyed me a lot and seems to end all the attacks.

Now, 25.Nh6+ or 25. Nf6+.

25.Nh6 is so compelling that you want to start calculating this move, but the gxh6 is not that good as it's closing the h-file where the Queen and the rook are doubled.

In fact i've prefered the move 25. Nf6 + almost immediatly.

25. Nf6+ gxf6 26. gxf6+
26...Kf7 Rg7 #
26...Kh8 27. Rg5 Qg6 28. Rxg6 Bxg6 and white has a winning advantage.

26...Bg6 or Qg6 27. Qxh7 #.

About 25. Nh6+
25. Nh6+ gxh6 26.gxh6+ Bg6 27.Rxg6 hxg6 28. h7+ Kh8 29. Rg3 Qf6 or Qf7 and there is no more attack.

Sep-12-08  penguin496: Let's deal with them. The worst of the bunch is

25...Kh8 26 Qxh7+ Qxh7 27 Rxh7#

Wrong, This is not mate.

Has anyone posted the winning variation after 25..kh8?

Also how does one quote other posts here?

Sep-12-08  penguin496: Oops,

ignore the last one.

Except how do you quote other posts here?

Sep-12-08  patzer2: For the Thursday September 11, 2008 puzzle solution, White's 25. Nf6+! decisively exploits the weak Black castled position.
Premium Chessgames Member
  Once: <penguin496> Not sure if this is the only way, but it works for me ...

Highlight the text that you want to quote from using your mouse. Press control and C together to copy the text to the clipboard.

Click into the comment box where you want the quote to go. Press control and V to paste the text from the clipboard onto the page.

To put text into <bold> put the < and > symbols on either side.

If you're still having problems, drop me a post into my forum and I will try to help out.

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  Messiah: Nice finish!
Jul-19-22  I Like Fish: that is right... exclam
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