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Grigory Levenfish vs Nikolai Riumin
Moscow (1936), Moscow URS, rd 7, May-22
Nimzo-Indian Defense: Three Knights Variation (E21)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Mar-11-10
Premium Chessgames Member
  chrisowen: For the Levenfish gold is at the end of the rainbow, dont route the knight via g3 leaving Nikolai less fuming Riumin. Shouldn't carp on about it but a good one's the coy Nf6. Grigory would've smoked him giving a big head hypothetically.
Mar-11-10  patzer2: <Once> Good catch on 28...Qxf1 prolonging the game for Black and short circuiting a quick checkmate. I thought I had solved it without consulting the computer, but I missed this line (28...Qxf1) which Fritz 10 confirms at 18-ply as +3.44 for White.

However, I think I'll still keep the combination classified in my collection as a mating attack, since the dual mate threats are the key to the combination which forces Black to give up decisive material. Also, with reasonably strong play, it should still end in Black being checkmated.

Mar-11-10
Premium Chessgames Member
  OBIT: To the posters saying that 28...Qxf1+ at least avoids the immediate mate:

Eh, not really... White has 29. Rxf1!, still threatening mate in two starting with Qg3+. The only move to delay the mate is 29...e5, but then 30. Qxe5 Rd8 31. Qg3+ Kf8 32. Re1 Be6 33. Qg7+ Ke8 34. Rxe6+ Kd7 35. Qxf7+ Kc8 36. Rc6+ Kb8 37. Qc7#.

Mar-11-10  patzer2: <kramputz> Many of us enjoy <Once>'s thoughtful, well written and intelligent posts, and do not appreciate ad hominen comments directed at him or any other member of our forum.

So please observe posting guideline number 3.

Mar-11-10  Patriot: <OBIT> Try 30...Kh8 instead.
Mar-11-10
Premium Chessgames Member
  OBIT: Or maybe not... 28...Qxf1+ 29. Rxf1 e5 30. Qxe5 Kh8! stops the immmediate mate, I think.

* * * *

Right, <Patriot>, you beat me to it. :)

Mar-11-10  PinnedPiece: I don't see where white can improve on this line, where black seems to be only slightly disadvantaged:

27.Nf6+ gxf6 28.exf6 Bb7 29.Rfe1 Qh5 30.Re3 Kh8


click for larger view

Mar-11-10
Premium Chessgames Member
  kevin86: White misses a mate!!
Mar-11-10  PinnedPiece: Nevermind, in my line 29.Qg3+ does it.
Mar-11-10  patzer2: <OBIT> I think you're still on the righ track after 27. Nf6+ gxf6 28. exf6 Qxf1+ 29. Rxf1! e5 30. Qxe5 Rh8 , since White is up two extra pawns and the Queen for Rook and Bishop with an easy win.

For example, playing it out quickly against Fritz 10 gives White an easy win after <27. Nf6+ gxf6 28. exf6 Qxf1+ 29. Rxf1! e5 30. Qxe5 Kh8> 31. Rc1 Be6 32. a4 Rfd8 33. a5 Rd5 34. Qc7 bxa5 35. bxa5 a6 36. h4 Rd4 37. Re1 Rd7 38. Qc3 Bg4 39. Qg3 Rd4 40. f3 Rg8 41. fxg4 Rdxg4 42. Qf3 Rxh4 43. Re7 Rhg4 44. Rxf7 Rxg2+ 45. Qxg2 Rxg2+ 46. Kxg2 .

Mar-11-10
Premium Chessgames Member
  Jimfromprovidence: Why not 26...Bb7, below, or Ba6?


click for larger view

Then 27 Nf6+ does not work cuz the queen has access to g5 and the two rook are now connected.

Mar-11-10  Marmot PFL: Solved this almost instantly, mainly because there was an almost identical problem a week or so back. Or am I imagining that?
Mar-11-10  supakeenrookie: I don't understand this puzzle at all!
Mar-11-10  mworld: interesting to note that blacks lack of connected rooks on the back rank is what stops e5 from stopping mate.
Mar-11-10  YouRang: Back-to-back spoilers!

Time to check... :-(

Mar-11-10  MaczynskiPratten: <YouRang> Not a spoiler, actually? The combination works, it's just that White missed it ...
Mar-11-10  muralman: Got it. Nf6+ is an obvious winner when given some thought. I looked at the defensive move, Ng3, thinking this might turn out to be a queen sac puzzle. There was nothing there. After that I went back to Nf6+ again, and saw a very potent attack with a quick forced checkmate. I was that confident.

When I saw the little red cursor I knew I would find the player moving to the g3.

Mar-11-10  tacticalmonster: I can see that almost all of us solved this puzzle. An indication that the puzzle may be a little bit too easy?

My recommendion to the level of difficulty of the puzzle should be as followed:

1) Mon and Tue should be a warm up test so 90% of us should figure it out

2) Wed and Thur should prepare us for tough test so 60% of us should score

3) Fri and Sat are really tough test and I expect only 25% get it

4) Sun is insane so only 10% or less solve the puzzle

What I suggest is that we should have more tough week. I am not being cocky but I just like more challenging puzzles. That's all.

Mar-11-10  patzer2: The weak 26...Qe2? didn't hurt Black in this game, only because White missed 27. Nf6+! .

However, Black could have avoided this possibility with 26...Bb7 =, eliminating the back rank weakness.

Mar-11-10  turbo231: Levenfish must have thought about sacing the knight, i did also, "we" thought it wasn't worth it, "we" missed it. Misery loves company.
Mar-11-10  turbo231: I stated yesterday if you give Rybka enough time she can solve any puzzle. I was wrong, i found a puzzle she couldn't solve and i'm sure that there's many more.
Mar-11-10  TheaN: Thursday 11 March 2010

<27.?>

Target: 3:30;000
Taken: less, not timed

Material: Black up minor piece exchange

Candidates: Qxf8†, Nf6†.... yeah <[Nf6†]>

-ML-
It's late here (1 am), so a straightforward answer from me: White utilizes a bank rank weakness and a King side attack with:

<27.Nf6†! gxf6 (Kh8 28.Qxf8‡ 1-0) 28.exf6> and something like Qg4, a to the point way to defend Qg3 reveals the puzzle his major key move:

<28....Qg4 29.Qxf8†! Kxf8 30.Rd8‡ 1-0> time to check, because I think I saw a draw.

Mar-12-10  WhenHarryMetSally: Nf6 and threatening a forced back rank mate after white moves Pxf6 and then sacrifices his queen. (I might have missed something here, but that would be my general plan).
Mar-17-10  hedgeh0g: <I stated yesterday if you give Rybka enough time she can solve any puzzle. I was wrong, i found a puzzle she couldn't solve and i'm sure that there's many more.>

There are. Chessbase.com had some great ones in its recent Christmas holiday puzzle page.

Dec-29-19  Sally Simpson: White to play.


click for larger view

The difference between knowing there is something on as in a set puzzle and playing over the board.

Quite a few here state, and I believe them, that they got it very quickly. (27.Nf6+ gxf6 28.exf6 and Black has to give up the Queen 28...Qxf1+ to stop the Qxf8+ and Qg3+ and mate next move threats.

However, there is no tap on the shoulder during a game to tell you to look for the shot. Often if you do not see it right away then you never will.

Levenfish says he spent 15 minutes studying the position before playing 27.Ng3 (Soviet Outcast - page 144)

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