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Miguel A Quinteros vs Larry Mark Christiansen
Linares (1981), Linares ESP, rd 4, Jan-21
English Opening: Anglo-Indian Defense. Queen's Indian Formation (A15)  ·  0-1

ANALYSIS [x]

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sac: 37...Rf2+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-06-08  Tactic101: Hmmm, 37...? would be a good Monday puzzle. Probably for simplification.

I should look at the game completely. Even with the exchange up, the game isn't clearly won for black.

Mar-06-08  Nimzoholz: Another petite combination by Christiansen to fork with the other Knight/same square 37...Rf2 38.Kf2 Ne4+ in order to simplify.
Mar-06-08  JG27Pyth: Missed it. I liked 25.bxc4 (thinking 26.Qxc4+ Ne6 ... wins the bishop so White had to play 26.bc instead, met by 26...Qb2+ )

But I should have seen 25.bxc4 26.Qxc4+ Ne6 27.Rxe6! Rxc4 28.Re1 and white will win back the queen and simplify to an advantageous but not won, ending.

So I found a tricky line that requires good defense and doesn't lose outright -- that wins a small bag of peanuts, a penny and a "keep tryin'" sticker, right?

What? No peanuts? *phooey*

-- Looking at the correct solution...Damn it it's not very hard! It strikes me as exactly the sort of combination I need to find. The "one step removed from being obvious" combination.

There's no glaring flaw in White's position that can be taken advantage of on the move, but there's obviously plenty to work with if you can see how to create the problem.

I examined Bxc3 thinking it had potential because it pulled White's rook off the back rank... it never occurred to me that the N was important in the way it guarded e4.

I think (or my rather, my chess software thinks) that 25.fxe4 would have been better for White than the text. Black wins Q for R+N... still seems like a pretty good deal for Black to me. ;)

Mar-06-08
Premium Chessgames Member
  johnlspouge: Thursday (Medium): Black to play and win

Material: Down a P. The Black Qb7 is on the same diagonal as the White Kg2. The Black Bg7 and Re8 are mobile, and Nh5 has a check Nf4+. The Nc3 is protected 1x by Rc1 and attacked 1x by Bg7, but Rc8 also attacks it implicitly, shielded by Nc5 and Rc4. The White Qh4 has one escape square, h3.

Candidates (25...): Bxc3

25...Bxc3 26.Rxc3

Candidates (26...): Ne4, Re4

26...Ne4 (forking Rd6 and Rc3)

The Ne4 is immune, because

27.fxe4 Rxe4 (threatening 28...Rxh4 and 28...Rd2++ 29.K any Qg2#)

Black gains the exchange and plays bxc4. He has lots of time to invade with his heavy pieces, because White has no serious counterattack with Ng1 so far out of play.

Time to peek. Attaboy! This combination has a crystalline beauty. I will post and then check the kibitzing.

Mar-06-08
Premium Chessgames Member
  johnlspouge: <<JG27Pyth> wrote: Missed it. I liked 25.bxc4 [snip]

There's no glaring flaw in White's position that can be taken advantage of on the move, but there's obviously plenty to work with if you can see how to create the problem.>

If it makes you feel better, <JG27Pyth>, I looked at 25.bxc4 also, because little P moves can be good preludes to bigger things. Generally, they are not forcing enough, but sometimes they come up roses. Tal is a master at such moves, e.g., a move I do not yet understand completely, 27...b5 in Spiridonov vs Tal, 1969.

I have my own ritual, listing piece protections, weak back ranks, pieces on common diagonals and files, etc., in preparation for finding a candidate. (I like to think my ritual is at least as good as <wals>'s technique of warming up his separate hemispheres :) Today, the ritual was invaluable, because when I looked for candidates, I found nothing interesting. I later recalled, however, that the Black Q and White K were both on a8-h1, and the importance of the square e4 soon became apparent.

Mar-06-08  Samagonka: Either these Thursday puzzles are getting more difficult or my performance is getting worse...
Mar-06-08  SpoiltVictorianChild: well, i saw that he could win the exchange, but didn't guess the pawn move that activates the queen.
Mar-06-08  Alphastar: Alright, this one wasn't too hard for me once I spotted the idea; The geometrical motif is 1. ..Bxc3 2. Rxc3 Ne4!
This leaves white a miserable choice between losing the exchange or having to sacrifice his queen after 3. fxe4 Rxe4! since then white cannot stop 4. ..Rxh4 AND the discovered check along the long diagonal. Time to check.
Mar-06-08
Premium Chessgames Member
  whiteshark:

<25...Bxc3> eleminating an e4 guard <26.Rxc3 Ne4> (forking the ♖♖) <27.fxe4 Rxe4> when the threat of a discovered check will win the white ♕.

Other lines ? DAUT !

Mar-06-08  zooter: <whiteshark:

<25...Bxc3> eleminating an e4 guard <26.Rxc3 Ne4> (forking the RR) <27.fxe4 Rxe4> when the threat of a discovered check will win the white Q.

Other lines ? DAUT !>

It might be a good idea for CG to put in puzzles where both players have sharp counterattacks and then it would be really interesting and tough to find the best line...

Mar-06-08
Premium Chessgames Member
  kevin86: If 27 fxe4,black may even do BETTER than catching the queen.

27 fxe4 Rxe4 28 Bf4 Re2+ 29 Kf1 (or h3) Qg2#-so black must lose a rook for a knight.

DEJA-VU,warning:26..Ne4 and 38...Ne4+ winning rooks at d6--first a rook fork,then a rook/king fork

Mar-06-08  JG27Pyth: <JohnLspouge:
Tal is a master at such moves, e.g., a move I do not yet understand completely, 27...b5 in Spiridonov vs Tal, 1969.>

Thanks for pointing that game out! Wow, b5 is either deep as hell or it's a brilliant positional deflection... I actually think it's super-deep super-accurate chess. It does set up the pin at the very end that clinches the combo. I think Tal calculated it all the way there. We are talking about Tal here... it's not just another GM. But that's just my not-very informed opinion. (and I didn't work through all the kibitzing around that move.)

Mar-06-08
Premium Chessgames Member
  johnlspouge: <<JG27Pyth> wrote: Wow, b5 is either deep as hell or it's a brilliant positional deflection... I actually think it's super-deep super-accurate chess.>

My first fumbling attempts with the Toga chess engine convinced me it was "super-deep super-accurate chess". This game, a puzzle of the day, remains an enigma to me. I will come back to it, so if I do find anything interesting, I will let you know, <JG27Pyth>. All I am really sure of is that the kibitzing did not begin to plumb the combination's depth.

Mar-06-08
Premium Chessgames Member
  Jimfromprovidence: White would have been OK if he had met 24...b5 with 25 b4.


click for larger view

Mar-06-08
Premium Chessgames Member
  DarthStapler: I didn't see this at all
Mar-06-08
Premium Chessgames Member
  whiteshark: <zooter: It might be a good idea for CG to put in puzzles where both players have sharp counterattacks and then it would be really interesting and tough to find the best line...> Sounds good. :D
Mar-06-08  radu stancu: Yey, I got this one! It looked pretty gloomy at first, with lots of interesting moves but none leading anywhere, until I saw Ne4 as a way to create new threats on the a8-h1 diagonal. Bxc3 was easy to spot after that. I don't think I'd spot this if I didn't know there was a winning move beforehand though...
Mar-06-08  wals: Tried several moves with no advantage.
The solution was too sophisticated for me.
Mar-06-08  012: Wednesday puzzle <68. ...?> Mar-05-08 V Tomovic vs Vidmar, 1945
Mar-06-08  YouRang: Well, I sort of saw some queen trapping potential, and I saw that my queen was on diagonal with the black king, and I figured that the key move would probably be with the knight...

All that to say: I missed it.

Mar-06-08  melv: Got it after staring at it for fifteen minutes. Seems so simple once you know the answer.
Mar-06-08  jheiner: <johnlspouge>because little P moves can be good preludes to bigger things...

Well, I missed this one. Because I found something else that I liked a lot and stuck to that. Check out this little sequence of pawn moves:

25...h6 and now the dark bishop must move. It can't create any serious threats immediately. In fact 26.Bd2 looks to be the only place where White doesn't lose material. (27.Bf6 g5 28.Qd4 Ne5 is wild but losing I think, 27.Bd8 g5, 27.Bf4 g5, etc.)

26...g5 forces 27.Qh3

Now, if Black can cover h4, then g4 wins the Queen, but the Queen is out of the game for awhile.

Maybe 27...Qe7 28...g4 29.Qh4 Bf6...

I imagine Fritz will tear me a new one, but I liked this...

Mar-06-08  jheiner: I think I missed a Qxh5 variant in the Bf6 line. That's a tricky line, simplest maybe 26.Bf6 Bxh6 27.Rxf6 Nxf6 28.Qxf6 or some such was the original variant, but Qd4 was interesting to me. I'll have to sit down with this one. Still like 25...h6
Mar-06-08
Premium Chessgames Member
  johnlspouge: <<jheiner> wrote: 25...h6 and now the dark bishop must move. It can't create any serious threats immediately.>

I used Toga II 1.3.1 to analyze, because I am still fathoming Smirin vs Beliavsky, 1989 and I am exhausted. I hate to burst your bubble, but here is the refutation.

25...h6 26.Bxh6 Bxh6 27.Rxg6+,

and the White Qh4 picks up whichever Black minor piece does not move (Nh5 or Bh6).

Chess engines are fantastic for checking logic. I have learned a lot from Toga's evaluation of my moves in game scores.

Mar-08-08
Premium Chessgames Member
  patzer2: For the Thursday, March 6, 2008 puzzle solution, Black's 25...Bxc3!! is followed by 26...Ne4! to set up a winning Knight Fork which, if White dares to capture it, comes with a decisive discovered check threat.
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