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Geza Nagy vs Hans Kmoch
Debrecen (1925), Debrecen HUN, rd 9
English Opening: Anglo-Indian Defense. Queen's Indian Formation (A13)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-07-09  WhiteRook48: at first I thought 26...Bxc5, and then I changed my mind to the weird blunder 26....Qxg3+??
Mar-07-09
Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult)

G Nagy vs Kmoch, 1925 (26...?)

Black to play and win.

Material: B for N+P. The White Kg1 has 3 legal moves. The Black Qg6 pins Pg3 to Kg1. The Black Rf7 faces Rf1 obscured by the White Bf3, which is on the a8-h1 diagonal with the Black Bb7. The Black Rd8 backs Pd4, obscured only by Bd3, which can capture Nc5. The Black Pd4 can advance to attack Qc2, while opening the White Kg1 to check along the a7-g1 diagonal. Finally, the Black Bb7 and Qg6 both attack Pe4. The White Kg8 is secure from checks, although Rf7-f1+ or Bd6-c5+ looks possible.

Candidates (26): Bxc5, d6

26Bxc5 27.Rxc5 [else, drop a N]

The decoy puts Rc5 and Kg1 on the same diagonal.

<[Here, I went for 27d3, but Toga indicates that Black only gets some pull from

28.Qd2 Qb3 29.Qa5]>

Mar-07-09  goodevans: <Manic: How about 27...Qb6 28.Rb5 d3+ 29.Rxb6 dxc2 30.Rb3 ...>

I think that loses to the immediate 30 ... Rd1 (rather than what you looked at, which was to delay this until after 30 ... Bxe4 31 Kg2).

Mar-07-09
Premium Chessgames Member
  playground player: Holy cow! Got a Saturday puzzle! It musta been too easy...
Mar-07-09
Premium Chessgames Member
  Jimfromprovidence: After I viewed the puzzle, I tried 28 Rb1?! for white, hoping to exchange queens.


click for larger view

That line line loses to 28...d3 29 Rxb6 dxc2.


click for larger view

White is helpless to prevent the pawn promotion.

Mar-07-09
Premium Chessgames Member
  agb2002: After 26... Bxc5 27.Rxc5 Black can try to exploit the pin along the b8-g1 diagonal with 27... d3 or 27... Qb6.

In the case of 27... d3 28.Qb1 and White seems to hold. If 28.exd3 Qb6 29.d4 (29.Qf2 Rxf3 ) exd4 (29... Rxd4 30.Rb5) 30.Rb5 d3+ 31.Qf2 Rxf3 32.Rxb6 Rxf2 33.Rxb7 Rxf1+ 34.Kxf1 d2 .

Therefore, 27... Qb6 28.Rb5 d3+ 29.Rxb6 dxc2:

A) 30.Rb2 Bxe4
A.1) 31.Bxe4 Rxf1+ 32.Kxf1 c1=Q+ .
A.2) 31.Ra2 Rd1 32.Ra1 Rxa1 33.Rxa1 Rd7 .
A.3) 31.Rb3 Rd1 32.Rc3 Rxf1+ 33.Kxf1 Rd7 .
B) 30.Rb3 Rd1 31.Rc3 Bxe4 32.Kg2 Rxf1 33.Kxf1 Rd7 .

Let's check.

Mar-07-09  number 23 NBer: <Jimfromprovidence> What does 28 ♖b1 do against 28...♕xc5?
Mar-07-09
Premium Chessgames Member
  agb2002: I also missed 28.Rxe5...
Mar-07-09
Premium Chessgames Member
  Jimfromprovidence: <number 23 NBer> <What does 28 Rb1 do against 28...Qxc5?>

It loses, of course. In that position, 28...d3 is objectively the better move for black. I was just trying to demonstrate the inevitable promotion of that created passed pawn.

On that note, here is a position where 28Qxc5 is not a winning move, specifically, if white tries 28 Bxh5?!


click for larger view

Here black must play 28Rxf1+ first, because 28 Qxc5?? loses to 29 Bxf7+, and white is up two pawns.


click for larger view

Mar-07-09  PinnedPiece: 27. ..Qb6 !

Didn't see that coming, not at all, but it is a beauty of a move.

The answer wasn't all that bad, but not enough.

Mar-07-09  zb2cr: Oh, bah. I exchanged on c5, but then had a hallucination about 27. ... Rxf3--for some reason I thought that White would have to submit to retaking with the Rook, when 28. ... Bxe4 would have regained the Rook. In this attack of egregious chess blindness, I didn't see that White could simply retake with the Pawn from e2.
Mar-07-09  starkidaway: I thought of this line:

26........Bc6
27.Ra5 Bc7
28.Rxa7 Bb6
29.RxR BxN (threating 30...d3+ and winnig the queen)

Mar-07-09
Premium Chessgames Member
  Marmot PFL: Cool game by the author of Pawn Power in Chess. My problem was i found 26...Bxc5 27 Rxc5 Qb6 28 Rb5 d3+ 29 Rxb6 dc2 30 Rb2 and missed the simple 30... Rd2 winning.
Mar-07-09  MaxxLange: this was a good puzzle

add me to the list of people who tried ...d3 first instead of ...Qb6 first, and missed the defense with Qd2 to Qa5, plus whatever other lines you guys have found since this morning

Mar-07-09
Premium Chessgames Member
  outplayer: After 26...d3 I think white can play 27.Nd3
Mar-07-09  CHESSTTCAMPS: After examining the king-side opportunities for a couple minutes, I noticed that black must respond to the threat of Nxb7 and that the move 26...BxN would create threats along the g1-a7 diagonal, tied to a possible promotional combination involving black's d-pawn.

After

26...Bxc5 27.Rxc5

black has the tempting choice of 27...d3 and 20..Qb6, but 27...d3 is not forcing enough, because white can play Qb2 preventing Qb6. Also 28.exd3 Qb6 29.Qf2 Rxf3 30.Qxf3 Qxc5+ 31.Kg2 may be viable for white with the threat of perpetual check on f7-h5.

So I like:

27...Qb6! 28.Rg5 d3+! 29.Rxb6 dxc2 30.Rb3 (30.Rb2 loses to 30..Rd2 [threatening c1/Q] 31.Rc1 Rd1+) Rd1 31.Rc3 Bxe4!

So far, everything has been forced, black has now won a pawn and is protecting the monster pawn on c2. Worst of all for white, both the Rf1 and the Bf3 are pinned. Black has an immediate threat of 32... Bxf3 33.exf3 Rxf3!

32.Kg2 g5! (easy to find - when you have pinned a piece, you look for a way to reinforce the pin.)

33.Bxe4 (There is no good way to procrastinate this. If 33.h3 g4 34.hxg4 hxg4 35.Bxe4 R1xf1! 36.Rxc2 R7f2#) R1xf1! 34.Rxc2 R7c2+ (less clear is g4 35.Bf3) 35.Kh3 Re1 36.Bd3 (36.c5 R1xe2 37.Rxe2 Rxe2 is equally hopeless) e4! 37.Bxe4 R1xe2 38.Bd5+ Kg7 39.Rxe2 Rxe2 40.c5 Kf6 41.g4 (forced because of the threat g4+ and mate next) h4 (trapping the White King out of play) 42.c6 Re3+ Kg2 43.Rxa3 followed by 44.Rc3, controlling white's passed pawn from behind, and black wins the endgame.

Long analysis, wrong analysis? Perhaps, but just about everything seems forced. This puzzle is great way to practice looking ahead more than 30 ply, something the danged computers can do in seconds, but it took me a lot longer than that!

Time to look at the game and the posts.

Mar-07-09  CHESSTTCAMPS: Wow - I completely missed the possibility of 28.Rxe5 played in the game, although I think that my analysis deals comprehensively with the 28. Rb5 possibility, which was much more work to analyze than the game continuation. By the way, there was a confusing typo in my first post: 28. Rg5 was supposed to be 28.Rb5 as the later analysis shows.
Mar-07-09
Premium Chessgames Member
  Richard Taylor: I saw the combination (almost immediately) but I was torn between 30 ... Rd1 and 30 ... axb6 (I thought that won but I missed 31. Rxd5... etc)

Also I "hallucinated" thinking that 30 ... Rd1 31. Rc5 then lost to 31...Rxf1+ and then e4!! - which would be great but there is a White pawn on e4 and no Black pawn on e5!!! I think I got to that as I saw 31. ... Rxf1+ 32. Kxf1 Bxe4

But I also thought that 30. ... axb6 stopped the W rook getting to c5.

So as usual I found the right ideas (and all the moves played) but missed - some of the details...

That is if

1) I don't find all the right moves I miss some sub variations or alternatively

2) I find a "brilliant" alternative combination which fails to a simple defence I missed; that someone finds on computer - or I find when I actually play the moves over...

3) a) I fail completely even to find the ideas or even the move - now that is often where it is or looks so "winning" and there are so many delicious alternatives I get bogged down trying them all and hallucinate or simply miscalculate and then give up

b) My brain simply fails to work - more the common result!! (My excuse is fatigue) so I look up the "solution"... ))

But I solved 2 of the insane combos completely - but I will add this - it took me hours so these days I just look for the main ideas.

Mar-07-09
Premium Chessgames Member
  Richard Taylor: I'll say this -

these problems from actual games are very good to work on (given one has time) even if one doesn't "solve them - even if one gets some of the main ideas - and/or just plays over the moves or whatever - eventually the tactics become easier (never easy though) and in an actual game I will gaurantee that more players than know they can will find they can do such tactics, partly BECAUSE of the adrenalin etc they will find something - it is both easier and harder to calculate OTB - so sometimes the calculation has to be combined with "intuition" and the courage to take a risk.

I think:

It's easier (in over the board play) because of the tension; but harder because of the time limits...

Mar-07-09
Premium Chessgames Member
  DarthStapler: I at least considered the first move
Mar-07-09  CHESSTTCAMPS: In the line 28.Rb5 (instead of game continuation Re5) d3+ 29.Rxb6 dxc2 30.Rb3 Rd1 31.Rc3 Bxe4 32.Kg2, <agb2002> had Rxf1 33.Kxf1 Rd7 which is quicker and more direct than my 33...g5. So not "long analysis, wrong analysis" but "long analysis, not quite best analysis". Nice work <agb2002>!
Mar-08-09
Premium Chessgames Member
  TheBish: G Nagy vs Kmoch, 1925

Black to play (26...?) "Very Difficult"

Unless I'm missing something, this look like a fairly straight-forward win after 26...Bxc5 27. Rxc5 Qb6 28. Rb5 d3+ 29. Rxb6 dxc2 30. Rxb7 Rd1 and the c-pawn will queen.

Also, if 26...Bxc5 27. Rxc5 Qb6 28. Rxe5 d3+ 29. c5 dxc2 30. cxb6 axb6! and Black's c-pawn will be costly to White.

Mar-08-09  CHESSTTCAMPS: <<TheBish:> wrote <G Nagy vs Kmoch, 1925 Black to play (26...?) "Very Difficult"

Unless I'm missing something, this look like a fairly straight-forward win after 26...Bxc5 27. Rxc5 Qb6 28. Rb5 d3+ 29. Rxb6 dxc2 30. Rxb7 Rd1 and the c-pawn will queen.> Right idea, but there's a bit more analysis to do. Not 30.Rb7? Rxb7, but after 30.Rb3 Rd1 31.Rc3 white can stop the pawn, but loses anyway to 31...Bxe4! See my earlier posts and the first post from <agb2002>.

Mar-08-09  number 23 NBer: <Jimfromprovidence> Okay, I was worried I was missing something obvious. You're right, 28...d3 does turn out better, but speaking for me, I would take the easy way out and pick off the rook.
Mar-15-09
Premium Chessgames Member
  patzer2: For the Saturday March 7, 2009 puzzle solution, White plays 26...Bxc5! to set up a deflection and discovered check tactic as part of a deep and decisive passed pawn combination.
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