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Juan Carlos Klein vs Bartolome Jorge Marcussi
ARG-ch (1963), Buenos Aires ARG, rd 6
Sicilian Defense: Najdorf Variation (B94)  ·  1-0



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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Feb-11-11  alachabre: Yes. 25...Qd8 is also good, relatively speaking. Hence only partial credit for the analysis.
Feb-11-11  kingfu: This one should have been classified as EASY.


Because I figured it out!

Feb-11-11  stst: Agreed with <kingfu>. Too easy and transparent that a series of blows after 21.Nf5+ etc etx. But if the Black N is at b4, threatening c2 (same time forking the White B,) thus Qxc2 is deadly, then White has to spare a move to protect c2, while the Q may not have the luxury to make a sac, nor Rd3 to deliver the mate. The puzzle will be more interesting (the underlying forces would be more even.) If in this situation even with the Q still in place, Black got chances.
Feb-11-11  CHESSTTCAMPS: In this middlegame position with kings castled on opposite wings, white is up a pawn and is much better mobilized for attack. The en prise knight on e7 telegraphs the "desperado" Nf5+ to batter the black king along the g-file. Obviously white has been preparing this, so that's where we'll go!

23.Nf5+ provides no survival option for black if white plays correctly:

A) 23... Kh7/h8 24.Qxh6+ Kg8 25.Qg7#

B) 23... Kg8 24.Qxh6 gxf5 (otherwise 25.Qg7#) 25.gxf5#

C) 23... gxf5 24.gxf5+ Kh7 (Kh8 25.Qxh6#) 25.Qxh6+!!

I waffled between 25.f6, 25.Rd3 and 25.Rd4 before discovering this simple approach. At first, I liked 25.f6 threatening mate in 2, but black can defend with 25...Rg8 26.Qe4+ Rg6 27.Bxb7 Qxe5, forcing simplification that white doesn't want. The rook moves are also flawed: 25.Rd3? Qb6! and 25.Rd4 Qe7 (26.f6 Qxf6) both appear to hold.

25... Kxh6 26.Rd3!

Amazing - a queen and knight ahead on an open board, but black can do nothing to stop Rh3#. Most likely, black tries

26... Bg2 27.Rxg2 Qxc2+ (hoping for 28.Rxc2 releasing the mating bind) 28.Kxc2 and black can resign.

Time to see how it played out...

Feb-11-11  tatarch: <tubeytubetuber: Does Black have any defence after White's 21st move?>

I had the same thought, and I think the answer is no. Last defense I see for black is 20...Bxd5, and I can't even tell if that holds. But I may be missing something.

Feb-11-11  Eyal: <Does Black have any defence after White's 21st move?>

No - as I already said in a previous post, 21.Qe3! threatens Qxh6+ with immediate mate, and 21...g5 wouldn't help because of 22.Qh3, so White's win is forced. The position after 20...Rae8 could be used for a more difficult puzzle.

Feb-11-11  reztap: Saw n-f5 ck. Did not see qxh6 ck. Very nice.
Feb-11-11  alachabre: <CHESSTTCAMPS> 26. ... Bg2 would indeed be an amazing defense ;-)
Feb-11-11  WhiteRook48: argh i tried 23 Qxh6+ at once
Feb-11-11  CHESSTTCAMPS: <alachabre: <CHESSTTCAMPS> 26. ... Bg2 would indeed be an amazing defense ;-)>

You're right, given that it's absolutely unavailable with the WB still on d5. Sometimes the visualization breaks down badly. Unfortunately, I also missed 24... Qxe5 in my B-line, as did some others. Kudos to those who posted the improvements.

Feb-11-11  David2009: Congratulations to <gofer> for his fine post (J Klein vs Marcussi, 1963) rehabiliating the 25 Rd4!? variation with his continuation 25...Qb6 26 f6!, and in a second post for good measure demolishing the 23 Kg8 defence.

After 25.Rd4!? Qb6 26.f6! Qxf6 <gofer> posts a win starting Qd3+ winning Q for R. There is an interesting alternative win with 27.Be4+ Bxe4 28.exf6 Bg6 to reach

click for larger view

and now there is a spectacular win starting 29.Rxg6! and I leave the interested readers to work out the variations as a kind of consolation prize for everyone who (like me) failed to find the Queen sacrifice in the original position. Crafty End Game Trainer finds the strongest defence (29...Kxg6). Enjoy finishing the EGT off! I have to admit I would not dare to play this line OTB because of the danger of Black somehow slipping out of the mating net White is trying to construct in the above diagram. This line is good as tactical training, but there is no doubt that <gofer>'s move 27 Qd3+! (winning Q for R rather than Q for B but snuffing out Black tactics) is a much more practical winning method. If you don't play 29 Rxg6 you will find that Black with only N and B for Q will nevertheless get very active piece play. Try it!

Crafty End Game Trainer links are given in my first post (link J Klein vs Marcussi, 1963).

Feb-11-11  morfishine: <LoveThatJoker> Thanks, an interesting puzzle on how to attack the <f7>-<g6> pawn arrangement
Feb-11-11  BOSTER: <Phony Benoni> <23.Nf5+ leaps out, especially since the knight can not be declined> And this is a big question, why do most kibitzers play 23...gxf5, not Kg8? Maybe because we are all in the same "puzzle" boat, or is this stereotype?
Feb-11-11  wals: Yeah, can claim a win for that one.

Rybka 4 x 64

Black Blunder
d 18 : 15 min :
23...gxf5, +#9.
(2. (#9): 23...gxf5 24.gxf5+ Kh7 25.Qxh6+[] Kxh6 26.Rd3[] Qxc2+ 27.Kxc2 Rc8+ 28.Kb1 Rc1+ 29.Kxc1[] Rc8+ 30.Kd2 Rc2+ 31.Kxc2[] Bxd5 32.Rh3# )

Best, 23...Kg8, +#16.

1. (#16): 24.Qxh6 Qxe5 25.Qxg6+[] Kh8 26.Qh5+ Kg8 27.Qg5+[] Kh7 28.c3 Nxc3 29.Qh6+ Kg8 30.Rge1 Ne4 31.Rxe4 Rc8+ 32.Kb1 Qxe4+ 33.Bxe4 Bxe4+ 34.Ka1 Bxf5 35.gxf5 Rc1+ 36.Rxc1 f6 37.Qg6+ Kh8 38.Qh5+ Kg8 39.Rg1#

Black went astray,
d 16 : 5 min :
16...Na4, +1.44. Best,

1. (0.88): 16...Bb7 17.Nxe7+ Kh7 18.Bxb7 Qxb7 19.Nd5 Rae8 20.Bf6 Nxe4 21.Bxg7 Kxg7 22.Qd3 f5 23.Qd4+ Kh7 24.Rge1 Qc8 25.gxf5 Qxf5 26.Re2 Re6 27.Qa7+ Rf7 28.Qxa6 g5 29.fxg5 Qxg5+ 30.Ne3 Qc5 31.Kb1 Ra7

17...Bb7, +2.14, didn't help. Best, dxe5.

Feb-11-11  LoveThatJoker: <morfishine> No worries, man. Thanks for being kind and directing a post to me regarding my note to you and Jimfromprovidence.

I hope that today is proving to be a great day for you and I look forward to kibitzing in future puzzles!

Sincerely and with good vibrations!


Feb-11-11  mrsaturdaypants: I'm going to be very disappointed if the first move isn't 23 Nf5+. That just looks too fun. If black doesn't take the knight, I think the queen infiltration on h6 is deadly. So:

23 Nf5+ gxf5 24 gxf5+ Kh7.

Here I pondered options for a while. And then I found a queen sacrifice. And that's even more fun.

25 Qxh6+ Kxh6 26 Rd3, with Rh3# next.

I don't get too many Friday puzzles, so perhaps I've missed something.

Time to check.

Premium Chessgames Member
  Jimfromprovidence: <LoveThatJoker> Thanks from me as well for the positive comments.

BTW..Good work yesterday on the alternative puzzle posted by <Phony Benoni>.

Feb-11-11  Eyal: <After 25.Rd4!? Qb6 26.f6! Qxf6 <gofer> posts a win starting Qd3+ winning Q for R. There is an interesting alternative win with 27.Be4+ Bxe4 28.exf6 Bg6>

click for larger view

To repeat again something I've already posted on p.2, 27.Qd3+ is certainly good enough to win in practice, but the quickest and most elegant finish in this line is to force mate with the rooks by giving up the queen: 27.exf6 Rxe3 28.Rg7+ Kh8 29.Rh4, mating on h6 the moment Black runs out of desperation checks.

Premium Chessgames Member
  Phony Benoni: <BOSTER: And this is a big question, why do most kibitzers play 23...gxf5, not Kg8? Maybe because we are all in the same "puzzle" boat, or is this stereotype?>

It's usually easier to see the good moves for your side. Once the pretty mate after 23...gxf5 is spotted, it becomes much harder to look for defenses that spoil it.

Myself, I can often see the tactical ideas without too much trouble, but have to consciously work on finding good defenses. Today, I completely failed to spot 23...Kg8 24.Qh6 Qxe5. It doesn't help in the long run, but you shouldn't take full credit without having analyzed it.

An interesting question is whether good defenses are found more frequently in puzzle solving or game situations. What is the greater motivator to do the hard work--the admiration of fellow kibitzers, or a point on the wall chart?

Feb-11-11  LoveThatJoker: <Jimfromprovidence> My pleasure, man.

I hope your Friday has been going great!

With sincere and good vibrations!


Feb-11-11  LoveThatJoker: <Jimfromprovidence> PS. Thanks for the compliment on Phony Benoni's puzzle.

That is one of those totally practical endgame puzzles.


Premium Chessgames Member
  thegoodanarchist: This must have been an extremely satisfying win for White! I would LOVE to play such a game in a rated tourny!
Feb-11-11  sevenseaman: 23. Nf5+ gxf5 24. gxf5+ makes things too easy for White. The best defense is 23. kg8( 23. Kg7 or 23. Kh8 lose more quickly).

click for larger view

<TheBish> has posted the best analysis on the 23. Kg8 response;

24. Qxh6 Qxe5 25. Qxg6+ Kh8 26. Qh6+ Kg8 27. Qg5+ Kh8 28. c3 Nxc3 29. Rge1 Ne4 30. Rxe4 and the Black Q cannot leave e5 on a/c of Qg7#

Premium Chessgames Member
  patzer2: For today's Friday puzzle solution, 23. Nf5+! initiates a mating combination, which involves a sham sacrifice of the Knight and Queen to clear the way for a rook lift and a decisive mate threat.
May-05-15  SpiritedReposte: Scorching mate combo.

Those connected white pawns serve as a nice shield for the rooks to do their thing.

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