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Milan Matulovic vs Georgi Tringov
Siegen ol (Men) fin-A (1970)  ·  Pirc Defense: Austrian Attack. Weiss Variation (B09)  ·  1-0
To move:
Last move:

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Given 8 times; par: 51 [what's this?]

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sac: 25.Nf5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-26-07  Confuse: Nice one. I moved the knight to take the pawn, but I guess this other way is more forceful.
Oct-26-07  znprdx: <RandomVisitor: 25.Nxh5 gxh5 26.Qh4 also wins.> This was my first choice - but it seems rather fuzzy. I wasn't convinced. But Nf5 makes this a Sunday puzzle (there were 3 distinct themes at work) except that the CG doubled pawn theme from Thursday was a clue. I opted for the less dramatic: 25.Rx[N]d7 Bx[R]d7 26.Bc5-well at least I found that idea:) Qd8 27.Bf7 which should win without bothering to win back the exchange. After Bxg6 Black is busted.
Oct-26-07  znprdx: addendum - now the Knight can command f5 - the Queen h4, and I'm reminded why I abandoned the Pirc-Robatsch :)
Oct-26-07  Rawprawn: I saw Nf5 and the queen deflection. Not bad for me on Friday.
Oct-26-07  TrueBlue: not to bad. Back to my normal form.

25. Nxh5 gxh5 26. Qh4
Nf8 27. Qxh5+ Nh7 28. Bc5

Black is toasted

Oct-26-07  Marmot PFL: So obvious this morning that 26.Qxf5 is much weaker than Qh4. Gives the bishop Bg4 and Bh3. That's what I get trying to do these after midnight. Fortunately black's position is so bad that 26.Qxf5 nf8 27.Qh5+ Nh7 28.Bc5 Bg4 29.Qxg4 Qxc5 30.Qf5 and 31.Rh3 still wins.
Oct-26-07  Alphastar: White to move, difficult. The first thing to notice is that our pieces are very well organised, particularly the rooks and Bc4. The black king is completely boxed in so we want to rip his kingside up, preferably bring our queen to h5/h6 or something. The first move that comes to mind is 25. Nf5. Also fun seems Rxd7. Let's look at this first.

25. Rxd7 Bxd7 26. Bc5 Qd8
This is all forced so far. Now things get interesting with 27. Nxh5! eg. gxh5 28. Qh4 and black has huge problems: 28. ..Bf8 29. Qxh5+ Kg7 30. Qf7+ Kh6 31. Be3# Or 28. ..Kh7 29. Qxh5+ Bh6 30. Qf7+ and 31. Rxd7 which wins neatly. I think this is the solution. Time to check.

Well, it seems there are multiple solutions. The line I chose is also completely winning, as is the text move.

Oct-26-07  xrt999: <TrueBlue: not to bad. Back to my normal form.

25. Nxh5 gxh5 26. Qh4
Nf8 27. Qxh5+ Nh7 28. Bc5

Black is toasted >

I played this line also, but since the c8-h4 diagonal is now open, Black responds with 28...Bg4! attacking the queen. White's attack is stopped. ouch.

both queens are attacked, and White must take the bishop. Black also takes your beloved bishop on c5, and the game continues with white attacking h7. Although White has the advantage the outcome is less clear.

The game goes on for about 20 moves and with all the calculations involved its anyone's game.

cheers.

Oct-26-07  wouldpusher: The catch here is 28. ♗c5!!, which gains a vital tempo, removes the guard, and opens the third rank for ♖h3.

I considered 31. ... ♗d7 as best in order to stave off immediate mate, but 31. ... ♗d7 32. ♕xf8+ ♗xf8 33. ♖xb8 is clearly winning anyhow. Black paid dearly for not giving time to develop the QB earlier.

Oct-26-07
Premium Chessgames Member
  whiteshark: I only thought of <25.Rxd7 Bxd7 26.Bc5 Qd8 27.Nxh5> with various strong threats (28.Nf4 or 28.Bf7). Now <27...gh5 28.Qh4 Bg4 29.Rxd8 Rbxd8 30.h3> and white should win.
Oct-26-07
Premium Chessgames Member
  Jimfromprovidence: Doesn’t 32… Nxf8 avoid mate, allowing the black king an escape square at h7?
Oct-26-07
Premium Chessgames Member
  kevin86: A very forceful ending with white attacking along the h-file and later,the eighth rank. Black king WAS really cornered!
Oct-26-07  Men Tal: I too had considered Bc5, attempting to deflect the Queen. But Black has 'zwischenzug', an in-between move, Bg4, uniting it's back rank Rs and forking the Q and R, forcing White to capture it and allow Black to then capture at c5. White has lots of K-side pressure and can recapture the piece (the N at h7) with a series of moves 30. Qf5, 31. Rh3 and 32. Rd7, with an easy win.
Oct-26-07
Premium Chessgames Member
  gawain: I saw that Nf5 was the right move. I'd like to think I would have played it over the board and hoped for the best even if I had not yet worked out the Q deflection or the rest of the details.
Oct-26-07
Premium Chessgames Member
  patzer2: For today's puzzle solution, White infiltrates and demolishes the weak Black King-side castled position with 25. Nf5!! The alternative 25. Nxh5, pointed out by <Random Visitor>, also wins using this theme.

My solution was 25. Ba7, which also seems to win but is not as strong as the move played. The simple idea 25. Rd6, attacking the isolated pawn on c6 also seems to win easily.

P.S. Anyone care to run a computer analysis and post the results on 25. Ba7 and 25. Rd6?

Oct-26-07  willyfly: Material is dead even. I don't have much time at all for this today but I'm guessing an attack might start with a ♘ sac 25 ♘xh5 to clear the g-file and give Black an isolated h-♙. Then play the ♕ to h4. That's all. Time to look.
Oct-26-07  pawnofdoom: Based on the games from the previous few days, I was surprised the answer to this puzzle wasn't 0-1
Oct-26-07  TrueBlue: < xrt999: <TrueBlue: not to bad. Back to my normal form.

25. Nxh5 gxh5 26. Qh4
Nf8 27. Qxh5+ Nh7 28. Bc5

Black is toasted >

I played this line also, but since the c8-h4 diagonal is now open, Black responds with 28...Bg4! attacking the queen. White's attack is stopped. ouch.

both queens are attacked, and White must take the bishop. Black also takes your beloved bishop on c5, and the game continues with white attacking h7. Although White has the advantage the outcome is less clear.

The game goes on for about 20 moves and with all the calculations involved its anyone's game.

cheers.>

allow me to disagree. I saw the bishop exchange, and I fail to see how this diminishes white attack

Oct-26-07  solstys: I also got the same line as <moppa> and I think it works, though more slowly. My weak computer program prefers 28...Bg4 in the line, but ultimately, white gets a +3.5 score. Any thoughts?
Oct-26-07  gBizzle: i got Nf5 but didnt get Qh4
Oct-26-07  PositionalTactician: To True Blue:

Well, I guess both moves win, but one wins more spectacularly, quickly, easily etc. I think you agree that it would be much better to deny black the change to play ...Bg4 or have a bishop controlling h3

Oct-26-07
Premium Chessgames Member
  swissteam: Why not 25. Nxh5 instead?
Oct-26-07  jperr75108: Nice problem.
Oct-27-07
Premium Chessgames Member
  MostlyAverageJoe: <patzer2: P.S. Anyone care to run a computer analysis and post the results on 25. Ba7 and 25. Rd6?>

Here it is, 18-19 plies deep after the move, hence most likely not trustworthy after the first 7 plies. I did not do any confirming analysis; the lines are straight out of Hiarcs.

After 25.Ba7 (18 plies):

1. (+3.49) 25... Rb4 26. Rxd7 Bxd7 27. Bc5 Qd8 28. Bf7 Rd4 ...

2. (+3.98) 25... Bh6 26. Bxb8 Nxb8 27. h3 h4 28. Ne2 f5 ...

After 25. Rd6 (19 plies):

1. (+2.28) 25... Nf8 26. Rxc6 Be6 27. Bc5 Qf7 28. Bb6 Rbc8 ...

2. (+3.76) 25... Ra8 26. Rxc6 Nb8 27. Bc5 Nxc6 28. Bxe7 Nxe7 ...

Oct-28-07  solstys: Can someone post analysis of 25. Rxd7 instead of 25. Nf5? Thanks in advance.
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