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Zdenko Kozul vs Pavel Eljanov
XXXV Bosnia GM International (2005), Sarajevo BIH, rd 3, May-21
Queen's Indian Defense: Petrosian Variation (E12)  ·  0-1

ANALYSIS [x]

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sac: 29...Ra1+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jan-14-11  MiCrooks: This may have been commented on already, but Qg5 g4 best is Qf6 again, so essentially this in between move forces a better version of the game continuation (assuming best defense by White which didn't occur).

The game was over anyway, so you can excuse White's big blunder Ne3 (Re3 prolongs things) which takes things from a material deficit to forced mate. The funny thing is that Black missed mate in 2 (after Nf5) during the game line! This is not too surprising as when you see a crushing line you don't normally dig deeper looking for something better. But the mate that was missed was so similar to the one that Black found that it makes it a bit more surprising. Plus it is totally forcing.

Rather than Nxf5 playing Bg1+ forces Kg3 where Qg5++ occurs.

Jan-14-11  patzer2: For today's Friday puzzle, 29...Ra1+!! offers up an exchange sham sacrifice to initiate a winning pursuit (King Hunt) combination.

After 29...Ra1+!! 30. Bxa1 (30. Kf2 Qg5! ) 30...Rxa1+ 31. Kf2, the not so quiet followup 31...Qf6! creates decisive threats:

32. d6 Bd2+ 33. Kg3 Qf4#

32. g3 Bd2+ 33. Qf3 Qxf3#

32. Re1 Bd2+ 33. Ke2 Bxe1!

32. Rc3 Bg5+ 33. Rf3 Nxf3 34. Qxf3 Bh4+ 35. Ke3 Qc3+ 36. Kf4 Rf1! 37. Qxf1 Qg3+ 38. Kf5 Qg5#

In the game continuation Black won handily, but missed the shorter mate-in-two with 33... Bg1+! 34. Kg3 Qg5#.

P.S.: I missed the followup 31...Qf6! in the game continuation, and so instead picked 29...b5!? as my attempted solution. This wins if White takes the bait after 29...b5!? 30. Qxb5? 31. Ra1+! Bxa1 32. Nf3+! , but puts up stiff resistance with no clear winning continuation after 29...b5!? 30. Nd2 .

Jan-14-11  awfulhangover: I saw the line up till 31..Qf6, but not 32.Ne3 Hmmm, did I solve it?
Jan-14-11
Premium Chessgames Member
  kevin86: I saw Ra1+,as this week's theme has been:check on the back rank-even if there is an escape,the exposed king can be attacked further.
Jan-14-11  patzer2: It would appear the followup after 31. Kf2 proved to be the most challenging aspect of today's puzzle for most of us.

<Jimfromprovidence>'s suggestion of 32...Qg5! is the one the computers seem to prefer, but may be a bit more complicated to calculate over the board.

<CHESSTTCAMPS> 32...Nxg2! is also winning, even though the computers rate it less strong than 32...Qf6! or 32...Qg5! The threat of mate-in-three after 32...Nxg2! 33. Kxg2? Qg1+ 34. Kf3 Qg3# makes it a good candidate for over the board human calculation.

P.S.: In addition to the pusuit (King Hunt) theme, a more subtle theme of the last two days puzzles is finding not so quitet moves to create multiple decisive threats, without a check or capture of material, following a (sham) sacrifice.

Jan-14-11  Patriot: Black is up a pawn and white's "threat" of 30.g3 looks risky for white.

There are a lot of ideas here for black: Ra1+, Rb4, Qc5+, Qg5. A good approach is to do a quick survey of each before getting too deep. I decided on 29...Ra1+. For example, 30.Bxa1 Rxa1+ (I saw no need to analyze 30.Kf2) 31.Kf2 and had difficulty between 31...Qf6 or 31...Qg5, but decided on the latter without a complete idea on how to continue. On 32.g3, 32...Bxg3+ 33.Qxg3 Rf1+ 34.Kxf1 Qxg3. I didn't consider 32.g4 but then again none of it was completely clear to me. 31...Qg5 looks very strong though and it's hard to believe that wouldn't be winning somehow.

Jan-14-11  David2009: Z Kozul vs Eljanov, 2005 Black 29...?

We (Black) are a Pawn up. White is threatening Qc3 followed by e5 with excellent attacking chances. Attack is the best form of defence, starting 29...Ra1+, but accuracy is required: White has potential back rank mate threats. We play: 29...Ra8+ 30 Bxa8 Rxa8+ 31 Kf2 Nxg2 seeing 32 Ra2? (hoping for 32...Rxa2 33 Rxa2 with back rank threats) 32...Qc4+ 33 Ne3 (if 33 Kxg2? Qg1 mates) Nxe3 34 Rxe3 Qxe3+ 35 Qxe3 Bxe3+ 36 Kxe3 Rxa2 and Black emerges from the carnage a Rook ahead. Much better for White is 32 Qb5 h5 and Black has two Pawns and an attack for the exchange. I will call this a "positional sacrifice". Time to check how the game went and also check variations against Crafty End Game Trainer:
=====
POSTSCRIPT: The puzzle position is now:


click for larger view

From <Phony Benoni> and <dzechiel> I note that the puzzle has evolved during today - it now starts one move earlier.
=====
Well, I saw the sacrifice but not the best follow-up (30...Qf6!) Would I have found it in a real OTB game? I will never know. When playing a combination I always do an accuracy check as I go along, knowing my fallibility in analysis.

Here's the position with White to play just before 29 Rcc2?:


click for larger view

According to my initial evaluation White does well with 29. Qc3 How well does this fare against Crafty EGT?

The answer is, not well at all. Link:
http://www.chessvideos.tv/endgame-t... If you open this free Internet link as White, and drag and drop the move you want to make, you find Crafty EGT gets well on top after 29 Qc3.

But my initial evaluation had been based on White having a free move in the diagram position. Let's pretend that it is White to move in the puzzle position (first diagram above). Sadly, the EGT refutes 1. Qc3 in this fictitious position also. So much for my strategic evaluation skills.

So how does my tactical analysis of the puzzle stand up? Reading the later kibitzes I am on the right lines. The puzzle position colours-reversed is


click for larger view

Z Kozul vs Eljanov, 2005 29...? colours reversed

Setting this up against Crafty EGT I find my proposed line does win - but Crafty EGT defends differently from the game line. http://www.chessvideos.tv/endgame-t... Incidentally my defence 32 Qb5? is refuted immediately by <CHESSTTCAMPS>'s 32...Qh4+ which is Black's real threat and which I had comprehensively missed. The stoutest defence is found by Crafty EGT viz. 30.Kf2 Nxg2 31.Bxa1 Rxa1 32.Rc3! Qc5+ (second best: as noted earlier, <CHESSTTCAMPS> move Qh4+ is stronger) 33.Ne3 Nxe3 34.Rcxe3 Bxe3+ 35.Qxe3 Qxe3+ 36.Kxe3 to leave


click for larger view

Black can win starting with either f6 or Rc1. Colours-reversed link for practice: http://www.chessvideos.tv/endgame-t.... Enjoy finding both wins, and try starting with the Rook check to see what happens.

Jan-14-11
Premium Chessgames Member
  Jimfromprovidence: The reason I liked 31...Qg5 first then 32...Qf6, was twofold; I liked the mate in one threat at g2 and I saw that I could afford the extra tempo because white has to move the g pawn right away to avoid mate.

But the clincher was what develops after the text 31...Qf6, where white has 32 Re3, after which follows 32...Bxe3+ 33 Kxe3, below.


click for larger view

Now I'm thinking that if that g2 pawn was not there then black could play ...Qf3+ and win the queen. So, after 31...Qg5 32 g3 Qf6 below, white can't play 33 Re3 any more.


click for larger view

Now everything opens up for black. If the g3 pawn takes either piece white gets mated. If 33 Rc3, then 33...Bg5+ wins major material.

Jan-14-11  rilkefan: After 31...Nxg2 I was looking at 32.Qf3.
Jan-14-11  CHESSTTCAMPS: I appreciate all the good commentary from <patzer2>, <JimfromProvidence>, <David2009> and others. Obviously I should have persisted longer with <Jim's> 31... Qg5 line. Crafty EGT went straight down my E.1 line and that was an easy win. ChessMaster did better by deferring the acceptance of the exchange sacrifice with 30.Kf2 Nxg2 31.Bf1 after which black should reach a clearly won endgame with best play.
Jan-14-11  dzechiel: <<David2009> From <Phony Benoni> and <dzechiel> I note that the puzzle has evolved during today - it now starts one move earlier.>

I would really like to use that as an excuse for my abysmal performance. It occurred to me this morning as I was getting ready for work that the white queen could simply capture the bishop on g3. I saw this 11 hours later in my mind's eye, but not when I was looking at the diagram. Had I noticed this move when trying to solve the position, I would have avoided that whole tempting line altogether (and maybe found something better, who knows?). <sigh>

Jan-14-11  Antonius Blok: There was another mate, quicker, wich I sawed first : 33... Bg1+ 34.Kg3 Qg5 #
Jan-14-11  wals: Went close.

Rybka 4 x 64

White blunder: ply 16 : 4 min :
(-4.85):29.Rcc2. Best, Nd2, -1.32.

1. (-1.32): 29.Nd2 h6 30.Rc4 Rxc4 31.Qxc4 Qg5 32.Nf1 Bd6 33.Qc6 Rb8 34.Qc3 b5 35.Bc1 Qg6 36.Qe3 Re8 37.Bb2 b4 38.g3 Qg5 39.Kf2 Ng6

2. (-1.48): 29.Qc3 Qc5+ 30.Kf1 f6 31.Rcc2 Ng6 32.Nd2 Qxc3 33.Bxc3 Bd6 34.Re3 Re8 35.Rf3 b5 36.g3 b4 37.Bd4 Ra3 38.Kg2 Ne5 39.Bxe5 Bxe5 40.Rb3 Kf7 41.Kf3 Rxb3+

White blunder: ply 15 : 4 min :
(-12.59):30.Bxa1. Best, Kf2, -4.85.

Black blunder: ply 16 : 4 min :
(-7.49):31...Qf6. Best, Qg5, -16.32.

White blunder: ply 15 : 5 min :
(-#3):32.Ne3.

1. (-#3): 32...Bh2+ 33.Nf5 Bg1+ 34.Kg3 Qg5#

Jan-14-11  rilkefan: <wals>, if you don't mind, what does Rybka think about 31...Nxg2?
Jan-14-11  wals: <rilkefan> 31...Nxg2. ( d 17 : 5 min :)

1. (-6.22): 32.Rc3 Qh4+ 33.Kxg2[] Qg5+ 34.Rg3[] Bxg3 35.Qxg3 Rg1+ 36.Kxg1[] Qxg3+ 37.Kf1 Qxh3+ 38.Kf2 f5 39.Nd2 b5 40.d6 cxd6 41.exf5 Qxf5+ 42.Ke1 Qc5 43.Re8+ Kf7 44.Rb8 b4 45.Rb7+ Ke6 46.Kd1 Qc3 47.Rb8

Jan-14-11  WhiteRook48: I found 29...Ra1+ 30 Bxa1 Rxa1+ 31 Kf2 and now Black can just rampage away
Jan-14-11  rilkefan: <31...Nxg2. ( d 17 : 5 min :)

1. (-6.22)>

Thanks. I'll gladly accept coming up with a winning continuation even if it's third best and figure out 32.Qf3 on my own.

Jan-14-11  rilkefan: Hmm, maybe 32...Qc5+ now works.
Jan-14-11  caissafan1963: <gopher> Your Qg5 line wins, but your analysis is a little faulty. In the line beginning with 32. Re1, you should have taken it one move further, as White consolidates his material edge after 37. Qd3! and now stands better. Follow up Qg5 with Qf6 as was previously mentioned and you've got it.
Jan-14-11  caissafan1963: OOPS. Actually, Black is still a little better after Nxc2, but it's not as good as the game continuation.
Jan-14-11
Premium Chessgames Member
  An Englishman: Good Evening: Same as yesterday's puzzle--I would have played the game continuation over the board and wondered why my opponent was resigning. I had faith that my sacrifices would work, but not the tactical skill to figure out why.
Jan-14-11  M.Hassan: "Difficult" Black to play 29....?
Black is ahead by a pawn.

29...........Ra1+
30.Bxa1 Rxa1+
31.Kf2 Qg5
32.g4 Qf6
33.Re1 Bd2+
34.Ke2 Bxe1
35.Rb2 Qf2+
36.Kd3 Qg3+
37.Kc2 Qg2+
38.Kd3 Qxh3+
39.Ne3
I think Black should win having the upper hand in materials. Let's see what have been played
----------------
I am not quite right in moves after 33. Sigh

Jan-15-11  turbo231: What's the story on Thursday's puzzle, why was it deleted from the member's area? I was busy Thursday and I didn't get a chance to look at it.

Well that's not completely true I looked at it for a few minutes and I couldn't solve it, but that's nothing new. I wanted to look at it again but I find it's deleted. I didn't read any kibitzes about it, just looked at it for a few minutes.

[game 447 deleted]

Jan-15-11  AGOJ: <al wazir, shoaibk> My bad, I misread the move as 34..., not 33...
May-10-20
Premium Chessgames Member
  WTHarvey: Black mates in 5.


click for larger view

35. ?

37.♕g4 ♖a3+

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