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Petar Popovic vs Dusan Rajkovic
? (1980)
Sicilian Defense: Paulsen Variation (B46)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jan-05-12  sethoflagos: The multiple attack 27...f5 (eg after 27.Be4+) is a move to be avoided. So I guess we should look at variations around the mating theme of 27.Rxf6!! Bxf6?? (... 28.Q/Rxh6#) 28.Be4+ Kh8 29.Qxh6#.

Black's only hope is a sustained (perpetual?) assault on the white king.

27...Qd1+ (27...Qxb6+?? 28.Kh1) 28.Kf2 Qxc2+ (28...Bc5+ 29.Nxc5) 29.Ke1 Qb1+ 30.Ke2 Qxb2+ 31.Nd2 Qb5+ 32.Nb4 and black runs out of checks.

28...Qxg4 looks to exchange Q for 2 Rs, but 29.Rxh6+ Kg7 30.Rh7+ Kg6 31.Qh6+ Kf5 32.Bh3 picks up the black queen.

Jan-05-12  CHESSTTCAMPS: Black is up two pawns and the bishop pair, but white seems unlikely to want to trade places. The gash in black's castled position is a weakness that could be defended more easily with the pieces that are still at home on the queenside. Black threatens 27... f5, winning material and killing the attack. At first I thought this is easy, but it is not!

I. 27.Rxf6(??) threatening mate (first and only candidate for way too long). It seems that black's overburdened defenders can only delay the inevitable with checks, but...

A) 27... Bxf6?? 28.Be4+ (*not* Qxf6?? - where I was initially going - Qd1+ followed by 29... Qxg4) Kh8 29.Qxh6#

B) 27... Qxb6+?? 28.Kh1 Qe3 (Bxf6 29.Be4+) 29.Be4+ Qxe4+ (Kh8 30.Rxh6+) 30.Rxe4 Bxf6 31.Qxf6 with a winning material advantage.

C) 27... Qd1+! 28.Kf2 Qxc2+ 29.Kg1 Bxf6 30.Qxf6 (Be4+ Qxe4) Qd1+ followed by 31... Qxg4 wins for black.

C.1) 28.Rf1 Qxf1+ 29.Bxf1 Bxh4 30.Rxh4 f5 followed by 31... e4 wins the exchange and stops counterplay against b7.

C.2) 28.Bf1 Bxf6 29.Qxf6 Qxg4 also wins for black.

Finally found II. 27.Qxf6!! Bxf6 28.Be4+! Kh8 29.Rxf6 Qd1+ 30.Kf2! wins! Black has no more useful checks and can't defend against 31.Rxh6#.

Very treacherous - I'm sure I would have swum right into I.C.2 OTB!

Jan-05-12  CHESSTTCAMPS: I guess I have to reverse myself again - 27.Qxf6?? Bxf6 28.Be4+! Kh8 29.Rxf6 fails against 29...Qxb6+ followed by 30... Qe3.
Jan-05-12  DrGridlock: Well, I should probably get black's rook accurately placed, if I want an accurate engine evaluation:

25 ... Qd6 remains the blunder that loses the game; 25 ... f5 does not work with Black's bishop unprotected. (Although it does about as well as Qd6).


click for larger view

Analysis by Komodo32 3 32bit:

1. = (-0.24): 25...Rh8 26.Rd1 e4 27.Qg4+ Kf8 28.Qxe4 Qe5 29.Qxe5 fxe5 30.Na5 Bc5+ 31.Kf1 Bxb6 32.Nxb7 Rb8 33.Nd8 Bxd8 34.Rxd8+ Kg7 35.Rxh8 Kxh8 36.b3 Kg7 37.Rg4+ Kh7 38.Re4 f6 39.Ra4 f5 40.Ke2 Kg6

2. = (-0.17): 25...e4 26.Rxe4 Qd6 27.Rg4+ Kh7 28.Rd4 Qe5 29.Be4+ Kg7 30.Rf4 h5 31.Rg4+ Kh6 32.Kg2 Qb5 33.Bf3 e5 34.Rge4 Kg7 35.Qxh5 f5 36.Rh4 Bxh4 37.Rxh4 Kf6 38.Qh6+ Ke7 39.Qe3

3. = (0.05): 25...h5 26.Qxh5 f5 27.Rg4+ fxg4 28.Qxg4+ Kh6 29.Qh3+ Kg7 30.Qg4+

4. (4.59): 25...Kh7 26.Rg4 f5 27.Qxe7 Bd7 28.Qxd7 Qc8 29.Qxc8 Raxc8 30.Bxb7 Rxc2 31.Rb4 Rxb2 32.Bxa6 Rc2 33.Rc1 Rxc1+ 34.Nxc1 f4 35.Kg2 fxg3 36.hxg3 Kg6 37.Nd3 Kf6 38.b7 Rb8 39.Re4 Kf5 40.Rxe5+ Kf6 41.Rh5

5. (5.20): 25...Qd6 26.Rg4+ Kh7 27.Rxf6 Qd1+ 28.Kf2 Qxc2+ 29.Ke1 Qb1+ 30.Ke2 Qg6 31.Be4 Bxf6 32.Qxf6 Qxe4+ 33.Rxe4 Rg8 34.Rh4 Rg6 35.Qxf7+ Rg7 36.Qh5 Rg6 37.Nc5 e4 38.Qe5 e3 39.Kxe3 a5 40.Ne4 a4 41.Ke2

6. (5.44): 25...f5 26.Qxe7 e4 27.Bxe4 Bd7 28.Qxd7 fxe4 29.Rxe4 Qd8 30.Qxb7 Rb8 31.Qc7 Kh8 32.Rh4 Qxc7 33.bxc7 Rbc8 34.Rc4 Kg7 35.Kg2 Rfe8 36.Nc5 f5 37.Nxa6 Kf6 38.Rc6 Re7

Jan-05-12
Premium Chessgames Member
  Jimfromprovidence: <cydmd> <is anything wrong with: 27.Rx<f>6 Qxb6+ 28.Kh1 Qe3 29.Be4+ (instead of Nd2) Though it may not the best continuation, I think it still wins easily.>

Looks good to me as well.

You post made me look at the 27 Rxf6 Qxb6+ line again but with the response 28 Kf1, which looks more dangerous for white than 28 Kh1, but it really works well, especially if 28...Qe3 follows.

Now your 29 Be4+ concept works perfectly, because it is an easy forced mate as black cannot take the bishop with check.


click for larger view

And if black tries after 27 Rxf6 Qxb6 28 Kf1 28Qb5+, then 29 c4 wins.


click for larger view

Jan-05-12  LoveThatJoker: Hi everyone! I normally like to solve the POTD as soon as they come up at Midnight EST, but I had a chance to catch quite an invigorating sleep, so here I am now in the daytime.

Today's solution is the nice 27. Rxf6! after which Black can try

27...Qxb6+ 28. Kh1 Qe3 (28...Bxf6 29. Be4+ and 30. Qxh6#) 29. Be4+ Kh8 (29...Qxe4 30. Qxh6#) 30. Rxh6+ mating

LTJ

Jan-05-12  poachedeggs: Saw the problematic pawn on f6 right away...did not calc how to get out of check after Qd1+...it is amazing how the knight on b3 figures in to limiting future checks by the black Q...lastly, LOL...34. Qg2+, "Come back here big boy! Not so fast."
Jan-05-12  LoveThatJoker: Dang! Missed the 27...Qd1 line.

There's always tomorrow!

LTJ

Jan-05-12  LoveThatJoker: Holy @#$%! I just realized that my line is flawed!

29. Be4+?? Qxe4+

What a fail.

Here's to a better final 3 days of solving!

LTJ

Jan-05-12  TheoNov: The way I look at these problems, you must first see all the relevant elements. In this case, they are:

I) The mate threat after 27.Rxf6.

II) The possible check on e4 by the light squared Bishop, aiding in the attack.

III) The counterplay available to Black, starting with 27...Qd1+. This counterplay actually has two ideas: IIIa) Perpetual check, or IIIb) To foil the attack by exchanging the Black Q for the two R (Bxf6 and Qxg4).

Now it is time to put it all together. The starting point must be I), since without a credible threat, you have nothing. Examining lines such as 27...Bxf6 28.Be4+ Kh8 29.Qxf6# (or Qxh6#) validates this. Also, seeing alternatives like 28.Qxf6 (threatening Qg7# and Be4#), where defensive tries like 28...Rg8 still run into mate (Qxf7, etc.), add further weight.

I should then be clear that Black's only hope to avoid mate is with III), i.e. 27...Qd1+. Now the key calculation becomes, from IIIa): Can the WK escape the checks?

The most obvious and solid-looking response to the Q check, 28.Bf1


click for larger view

spoils White's attack (and leaves White lost) since Black can now shift over to plan IIIb) with 28...Bxf6 and 29...Qxg4. The Black Q can then go to g7, stopping White cold.

So then, the hope for White lies in boldly walking the K toward the checking Black Q, starting with 28.Kf2.


click for larger view

Now this is where experience and "pattern recognition" helps, because you may recognize that it is quite possible to find a place where the BQ can no longer give check, especially when a friendly N is avaiable to cover the diagonals. So lets see: 28...Qxc2+ 29.Ke1 Qb1+ 30.Ke2 Qc2+ 31.Nd2.


click for larger view

And indeed, Black has run out of checks. Attempts by Black to shift over to "plan B" during the checking sequence with ...Qg6 lose to Be4.

And so, Black is left with only 28...Qxg4


click for larger view

and in this position it looks highly likely that White can find a mate or forcing win starting with Rxh6+ or Qxh6+. Let's see:

29.Rxh6+ Kg7▢ 30.Rh7+ Kg6▢ 31.Qh6+ Kf5▢ 32.Bh3 Qxh3▢ 33.Qxh3+.


click for larger view

White is clearly winning and probably even has a short mate.

Jan-05-12  BadKnight: material - black is two pawns up, so quiet play does not favor white. there has to be some tactical shot

black king is stuck at the edge of the board. can white exploit this tacticallly?

apparently queen sac on h6 does not work.

looks like white needs the b1-h7 diagonal for his LSB.

lets try sacrifice on f6

1. Rxf6 Bxf6 2. Qxf6 Qd1+ 3. Bf1

now what?

____

missed it. i was too scared to play king on f2. did not spend enough time to check further.

Jan-05-12
Premium Chessgames Member
  chrisowen: Be dinner f6 in I should queen bishop mate. How toggle f-f5 as taming the shrew oof wrench or f6 bxf6 be4! Er caramel queen starred prominent in black plan flatten white am in you go tease again lock in heed cough it a king f2 as far as my vision failed me. But victory in too breach!
Jan-05-12  fetonzio: funny how i looked at rf6 and be4 separately, but didn't think to make them work together. nice combination, very fischer-benko
Jan-05-12
Premium Chessgames Member
  gofer: I think Rxf6 is pretty easy to see. The only thing clouding the issue is that Qd1+ needs to be dealt with and only once I had worked out that the white king can march towards the black queen with impunity did I see that the line was "sound".

<27 Rxf6 ...>

27 ... Bxf6 28 Bd5+ Kh8 29 Qxh6#
27 ... Qxb6 28 Kf1 Qb5+ 29 c4 winning

<27 ... Qd1+>
<28 Kf2 ...>

28 ... Qxc2+ 29 Ke1 Qb1+ 30 Ke2 Qxb2+ 31 Nd2+ Qb5+ 32 Nc4 and the checks run out...

<28 ... Bc5+>
<29 Nxc5 ...>

29 ... Qd2+ 30 Kg1 Qe1+ (Qe3+ Kh1 and runs out of checks) 31 Rf1 Qe3+ 32 Kh1 f6 33 Ne4 winning

<29 ... Qxc2+>
<30 Kg1 Qxc5+>
<31 Kh1 Qc1+>
<32 Rf1 >

Time to check...

---

Ironcially, I missed the line actually played. I didn't think that Qxg4 was ever going to be playable!

Jan-05-12  LIFE Master AJ: For me, this was an "insane" puzzle, I found all the moves in the game up until about move 30 or 31, then I lost track of the position.

I also blew my time limit, over 30 minutes, and I was still not finished. Not sure if it was me, or this puzzle was just that hard.

Jan-05-12  scormus: <LMAJ> Oh well, if you thought it was tough I dont feel so bad about it.
Jan-05-12  Nemesistic: Iv'e been through this game and although i missed the actual final mating position in the game itself,it can be done in more than one way which i saw fairly quickly.. Rxf6 jumps strait out at you!

If <Gizmo> missed it though,it means he actually did have his engines fired up,but was just as surprised (for want of a better word) as the rest of us 1700's as how White played it out.. Typical computer user,his over reliance on all these engines only expose his shortcomings as a chess player,and any chess title bestowed on him is undeserved..

His video's prove this,he can't say a sentence without mentioning what Fritz thinks,and not what he thinks..

A fraud and a fake!

Jan-05-12  CHESSTTCAMPS: Try playing the puzzle position against Crafty from the following link.

http://www.chessvideos.tv/endgame-t...

Good luck!

Jan-05-12  sevenseaman: <CTTCAMPS> No problem beating <Crafty> in one go.
Jan-05-12
Premium Chessgames Member
  Marmot PFL: White would like to play Be4+, but that is met by f5, so the thematic move 27 Rxf6 eliminates the f pawn and also threatens mate on h6.

27...Bxf6 28 Be4+ Kh8 29 Qxh6 mates, but the problem is 27...Qd1+. 28 Bf1 pins the piece needed for the e4 check, and 28 Rf1 loses to Qxf1+ and Bxh4. But it looks like white can escape checks with 28 Kf2 Qxc2+ 29 Ke1 Qb1+ 30 Ke2 Qxc2+ 31 Nd2 and white soon wins.

Didn't look much at 28...Qxg4 though. After 29 Rxh6+ Kg7 white can take the queen with check, but of course can do better, which i didn't see initially. Having reached this position the finish is fairly easy to find, and 27 Rxf6 is a combination most players would play anyway as black is threatening 27...f5 with counter play.

Jan-05-12  RandomVisitor: 25...e4 looks good for black


click for larger view

Analysis by Deep Rybka 4.1 x64:

<[-0.38] d=22 25...e4> 26.Bxe4 Rg8 27.Bd3 e5 28.Qe4 Rh8 29.Rc4 Bd8 30.Kg2 Bxb6 31.Qf3 Qd6 32.Nd2 Qe7 33.Bf5 Bxf5 34.Qxf5 h5 35.Ne4 Bd8 36.Rd1 Qe6 37.Nd6 Qxf5 38.Nxf5+ Kg6 39.Nh4+ Kg5 40.Rd7 Rb8

Jan-05-12  stst: Quite simple for me, if I don't miss anything! (just looking at diagram) 27.Rxf6
IF (A) any then 28.Qxh6#
IF (B) Bxf6, then 28.Be4+ Kh8 (what else?), 29.Qxh6#
Jan-05-12  stst: I did miss a small boat!
The sour peach! - Black's Q+ and later exchange for a Rook? -- simply a delay tactic, nothing significant in fighting back!?
Jan-05-12  gezafan: 8...h6 seems questionable. What for at this stage of the game?
Jan-06-12  rilkefan: <<DrGridlock>: Well, I should probably get black's rook accurately placed, if I want an accurate engine evaluation>

I was wondering how I missed ...f5. In a minute I would have started wondering how Rajkovic did.

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