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Jon Loftur Arnason vs John Nunn
Novi Sad Olympiad (1990), Novi Sad YUG, rd 13, Dec-01
Spanish Game: Closed Variations (C84)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Apr-11-08  zb2cr: Drat. I followed exactly the same line as <MostlyAverageJoe> and <Domdaniel>, which it turns out is much less forcing than the game continuation. I didn't see the power of the Rook lift--23. Re3, gxf5; 24. Qxf5+, Kg7; 25. Rg3+, Bg5; 26. Rxg5+ with mate next move was obvious, but I thought that 23. ... Nf8 was a more than adequate defense. Oh well, hopefully eventually my board vision will improve!
Apr-11-08  Samagonka: At least the first 3 moves of this long combination crossed my mind.
Apr-11-08
Premium Chessgames Member
  Eyal: Since, as has already been pointed out, 23...Ke6 instead of 23...Kf7? would have allowed Black to put up much tougher resistance, the most efficient way for White to finish the game might be <22.Nh6!> (mentioned by <MAJ> without much further analysis), instead of Re3:


click for larger view

Because <22...Rf8> is pretty much forced here, the rook lift <23.Re3> becomes stronger, as Black can't respond with Nf8 anymore. The most immediate threat is 24.Ng8+! with a quick mate. Some possible lines:

23...Ke6 24.Qxg6+ Bf6 25.Rxd3 Nc5 26.Bxc5 Qxc5 27.Qg4+ Ke7 28.Nf5+ Kd7/d8 29.Nxd6 - utterly hopeless for Black; e.g. 29...Kc7 30.Nxb7 Nxb7 (30...Kxb7 31.Qd7+) 31.Rd7+ Kb8 32.Rxb7+! Kxb7 33.Qd7+ followed by 34.Rb1+.

23...Rae8 24.Rf3+ Ke6 25.Qxg6+ Bf6 26.Rxd3 leads to something very similar.

23... Nb6 24.Rg3 Ke6 25.Rxg6+ Kd7 26.Bxd6!

23...Nc5 24.Bxc5 dxc5 (24...Qxc5 25.Ng8+!) 25. Ng4+ Ke6 26.Qxg6+ Bf6 (26...Kd7 27.Rxd3+ Kc8 28.Qe6+ Kb8 29.Rd7; or 27...Bd6 28.Nxe5+) 27.Rf3 Qe7 28.Rf5! (with the threat Rxe5+; also winning is 28.Qf5+ Kd6 29.Nxf6, but this is even more powerful) 28...Kd6 29.Nxf6.

Apr-11-08
Premium Chessgames Member
  kevin86: I had the first three moves,but was a bit sketchy after that...

Funny how the long-away bishop was able to enter the fray,while the nearby defenders aided black,not at all.

Apr-11-08  YouRang: <thitho: What are the white possibilities if 23. ...Ke6 ?>

Yes, this seems to be black's best move there. It brings into doubt the effectiveness of 22.Re3, with regard to being part of the solution.

Apr-11-08  Magic Castle: <Kevin 88> That is quite normal in actual game. You just have this gut feeling about a sacrifice and if it will prosper for at least 3 moves, I will go for it and worry later on. That makes chess exciting. Sometimes I lose sometimes I win. Going through the tree analysis too much will bring you in time trouble. Of course in analysis, you have the whole day to figure all the variations.
Apr-11-08
Premium Chessgames Member
  Domdaniel: <MAJ> -- <Puzzles that make engines sweat> is a brilliant idea for a games collection, but, um, you don't seem to have much in it yet. Is it a brand new venture?
Apr-11-08  thitho: <YouRanq> happy to read you here, because, as interesting as all contributions are (and they are!), it seems that most of our fellow players eluded the solution proposed by the two players until the 22nd movement. I really think 23. ... Kf7 is a mistake here from Nunn. Of course, white can have R+2p for B+N but it seems to me a good rescue from black due to the good attack on the 20th movement.

So my question to fellows players here is: what in the diagram after 23. Qh8+ if black plays Ke6? And if 24. Qh3, then I play Kd7. (and of course if 25. Ng7+, then Kc6, or Kd8 (I can't decide and I don't have the computers to help :-)

Apr-11-08  SolaGracia: I saw the first two moves easily. What came as a surprise was 22. Re3. The only two possibilities I had considered (no computer) were:

22. Qg7+ Ke6
23. Qg6#

<or>

22. Qg7+ Kg5 (the only other move?)
23. Nf3+ Kg4
24. h4+ Kf4
25. Qh6#

Apr-11-08  SolaGracia: OOPS! I also missed Nf6 saving black from immediate mate after Qg6+. This was my first post and I have always been afraid to say anything totally wrong, and it didn't take many posts to do it!
Apr-11-08  Marmot PFL: I am not sure white has a forced win. 23...Kf7? loses quickly but black could escape with 23...Ke6-d7 instead and the win (at the least) is not easy to find.
Apr-11-08
Premium Chessgames Member
  Domdaniel: <SolaGracia> Never mind -- your *other* mate was good.
Apr-11-08
Premium Chessgames Member
  johnlspouge: <<SolaGracia> wrote: OOPS! [snip] This was my first post and I have always been afraid to say anything totally wrong, and it didn't take many posts to do it!>

If you try to make it interesting, life becomes a series of mistakes... Everyone who posts is sympathizing; everyone else is silent.

Welcome, <SolaGracia>!

Apr-11-08
Premium Chessgames Member
  gawain: A nice combination! Saw the first two moves, they had to be the way it started. But I, too, did not think that the e1 rook could get involved quickly enough so I never seriously considered 22 Re3.
Apr-11-08  Brapp: What if (continuation) 26...Bf6?
Apr-11-08  Riverbeast: <What if (continuation) 26...Bf6?>

Munch on f6 (check)...Munch on g6 (check)....After black plays ...Qg7 then Qh5, threatening Rg3

Finita la commedia

Nunn got out-Nunned in this game

Apr-11-08  YouRang: <SolaGracia><This was my first post and I have always been afraid to say anything totally wrong, and it didn't take many posts to do it!>

TWO STEPS TO LEARNING:
1. Being willing to make a mistake.
2. Being able to admit making a mistake.

You're already ahead of a lot of people! Welcome aboard <SolaGracia>. :-)

Apr-11-08  Riverbeast: <SolaGarcia> Chess is a difficult game...we're all learning here...There's nothing wrong with making mistakes in analysis, even GMs do it
Apr-11-08  znprdx: After 20.Bxf7+ Nunn missed the best move: Resigning. Not bad for a Wednesday puzzle:)
Apr-11-08  patzer2: For today's Friday April 11, 2008 puzzle solution, White plays a winning demolition of pawn structure combination beginning with 20. Bxf7+!!
Apr-11-08  frankmarshall: Why can I always see the obvious but never follow through. Bxf7+ was the first move that came to my head, it just looks right, but I couldn’t finish it out. I spent some time looking at this one.
Apr-11-08  TrueBlue: nice puzzle, but Re3 was a blunter. The natural Qg7 is much stronger (e.g. follow with Qxg6 and Ng7+, which wins a rook).
Apr-11-08  MaczynskiPratten: <eblunt: From the game, I thought black might be better trying 22... Qxc3> I agree, I couldn't see a clear refutation of this. Another argument against 22 Re3 perhaps. Though no doubt I'm missing something - surely Nunn would have seen it!
Apr-11-08  wals: Static Evaluation: White is down a pawn. Black has a passed pawn. All pieces are on the board.

Dynamic Evaluatuion: White's bishop pair are directed at the black King. The white diag. bishop has a clear line to give check and must win an Exchange. The f5 Knight can also deliver check on h6.

Dynamic Assessment: What if Ng3+, King moves g7. not much future in that. Try Ba2xf7+ King must move h8, now must move the Queen to .h3. Reasonable moves: Bxf7+, Nh6+ Nxe7+
Have a go,

20.Bxf7+ ...Kh8 21.Qh3 ...gxf5 22.Bf7-g6

PM=

No dipped out again, Nd7-f6 scuttled that line. even when 21. Bxg6.

Apr-11-08
Premium Chessgames Member
  johnlspouge: Here are the Mom-and-Pop Toga II 1.3.1 evaluations today. I have put <the last move entered into the computer> in angle brackets, so the first move after the angle brackets is computer analysis of the corresponding best line.

[ply 15/73, time 07:18, value +1.93]

20.<Bxf7> Kxf7 21.Qxh7+ Kf6 22.Qg7+ Ke6 23.Qxg6+ Nf6 24.Nf3 Nb3 25.Rad1 Qxc3 26.Nxe7 d2 27.Rf1 Rxe7 28.Ng5+ Kd7 29.Qf5+ Ke8 30.Qxf6 Nc5 31.Qg6+ Kd7 32.Bxc5 dxc5

[ply 15/48, time 02:33, value +3.71]

20.Bxf7 <Kh8> 21.Bxg6 Nf6 22.Qh4 Rg8 23.Bxd6 Bxd6 24.Qxf6+ Rg7 25.Re3 Rf8 26.Qxg7+ Qxg7 27.Nxg7 hxg6 28.Rxd3 Bc5 29.Ne6 Bxf2+ 30.Kf1 Rf6 31.Rd8+ Kh7 32.Nf3 Be3 33.Rd7+ Kh6

[ply 15/66, time 04:13, value +1.45]

20.Bxf7 Kxf7 21.Qxh7+ Kf6 22.<Re3> Nf8 23.Qh8+ Ke6 24.Qh3 Kf7 25.Rf3 Bf6 26.Nxd6+ Kg7 27.Nxe8+ Rxe8 28.Rxd3 Rd8 29.Rd1 Rxd3 30.Bxf8+ Kxf8 31.Qxd3 Kg8 32.Qg3 Qf7

The main conclusions are: (1) Black is better accepting than refusing the sacrifice 20.Bxf7 (surprise!) and (2) 22.Re3 is 0.48 Ps worse than 22.Qg7+.

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