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Tiger Hillarp Persson vs Fernando Peralta
Khanty-Mansiysk Olympiad (2010), Khanty-Mansiysk RUS, rd 7, Sep-28
Indian Game: Anti-Nimzo-Indian (E10)  ·  1-0



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Kibitzer's Corner
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Premium Chessgames Member
  agb2002: White is a pawn down.

The black queen protects the LSB. Therefore, divert her with 19.a4 Qxa4 (otherwise 20.Rxd7) 20.Ra1 Qb5 21.Ra5 and Black's LSB is lost.

Nov-04-10  imreker: Ah, I forgot that after 19. a4, the Queen can't move to c6. Probably long pondering over 19. Bf1 made me think c6 square is safe, so I kept thinking like 19. a4 was simply not working...

Bad day for me. Even worse, because I gave up despite seeing the right move.

Nov-04-10  Stormbringer: To me this looks a lot like the Monday puzzle, which I didn't get. I didn't get this one either, so obviously I didn't learn the lesson well enough! Bother.
Nov-04-10  gofer: The major weakness for black is Bd7, attacked by Rd1 and only protected by Qb5. The other issue is that if black allows Rxd7 then things are looking grim for black as white will have a huge outpost on the 7th rank and can start by taking pawns b7/a7 and then double the rooks! So lets make the queen leave the a4-e8 diagonal.

19 a4 Qxa4
20 Ra1 Qb5
21 Ra5 Qb4/Qb6
22 Rxd7 ...

Time for black to resign and me to check...

Nov-04-10  zb2cr: Half asleep, and I missed this one. Black played like he was asleep.
Nov-04-10  patzer2: For today's Thursday puzzle solution, 19. a4! initiates a deflection combination to remove the guard or protection of the Queen and wins decisive material.
Nov-04-10  Marmot PFL: One of the easier puzzles. Driving the queen from guarding Bd7 is simple.
Nov-04-10  Oxnard: 19. a4! deflects the bishop's only defender and after ...Qxa4 20. Ra1 Qb5 21. Ra5, the black queen is forced off the a4-e8 diagonal and the bishop is up for grabs: Rxd7
Nov-04-10  Patriot: I may have spent 1 minute just looking over the position and seeing what kinds of forcing moves I have. The first thing was to look at the kingside but white's pieces are not coordinated enough to do anything there. After quickly ruling out other ideas, I turned to the IGP on d7.

19.a4 Qxa4 20.Ra1 Qb5 21.Ra5 looks simple enough. Black doesn't seem to have any counterplay.

It took me about 1 minute to see the combination. Is this too long? Could be. Perhaps pattern recognition should have triggered the idea instantly and only after that, go over the position to see if there is anything better. Sure...I solved it but this is a subtle yet important distinction. After all, IGP's are very common.

Nov-04-10  YCP: Well that's 3/4 this week for now. Couldn't see this one. I saw the bishop hanging but not a way to exploit it.

My idea was something like Bxc5 Bxc5 Qxc5 Qxb2 Rb1 Qa2 Rxb7.... Equalizing the material.

Nov-04-10  JG27Pyth: Looked at first glance to me like a trap-the-Queen puzzle, the investigation of which quickly led to the weak Bishop defended only by the Queen.

A nice purely didactic installment in Once's ongoing serial chess lectures. <Once> I'm not convinced they aren't viable commercially, but at an absolute minimum you should at some point collect these for your own circle... what chess-playing favorite nephew or niece wouldn't want a handsomely bound copy of <<Uncle Once's Reflections and Admonitions upon Life, Love, Proper Grooming and Other Divers & Sundry Topics as Suggested by the Arrangement of Pieces upon a Chequered Board>>

Nov-04-10  David2009: T Hillarp Persson vs F Peralta, 2010 White 19?

White is temporarily a pawn down which he can regain immediately with 19 Bxc5 Bxc5 20 Qxc5 but Black has then ...Rab8 probably sufficient for equality. Instead 19 a4! puts Black in difficulties: 19...Qxa4 20 Ra1 Qb5 21 Ra5 apparently wins either Q for R or the Bd7. Black does however have a possible back-rank counter-attack. Analyse further: 21...Qb6 22 Rxd7 Rad8 23 Rxd8 Rxd8 and either 24 h4 or 24 Kf1 look OK (analyse further when we get the position over the board). Time to check/ win it against Crafty End Game Trainer: ====
The puzzle position is below:

click for larger view

(T Hillarp Persson vs F Peralta, 2010 White 19?)

First the good news: I have solved the puzzle. Now the bad news: I can't yet beat the EGT. Nor did I find the best defence. Link:

Nov-04-10  SetNoEscapeOn: Bd7?? incredible blunder for a player at Peralta's level.
Premium Chessgames Member
  kevin86: Funny,I was the move a4 immediately,I missed the reason behind it:a queen trap.White's bishop deprive black of much space and black's queen is awkwadrly placed.

Like a boxer leading with his head.

Nov-04-10  LIFE Master AJ: It took a couple of minutes, but I finally figured it out.

19.a4, QxP/a4; 20.Ra1, Qb5; 21.Ra5, and it looks like Black will lose a piece.

Premium Chessgames Member
  Once: <JG27Pyth> Love the title! Or how about "kibitz and pieces"??

I've got no plans to publish or collect these random mutterings. Then again, I didn't plan to write them either. They just sort of evolved, and keep on evolving. I suppose if I knew what was going to happen next it wouldn't be an adventure.

Nov-04-10  DLev: It took me ten tries before I beat the EGT. Going up a Queen for Rook and two pawns was a blind alley. The line I won with (finally and without computer assistance) begins 19. a4 Qxa4; 20.Ra1 Qb5; 21.Ra5 Qe2 22.Rxd7 R(f)d8; 23.Qd2 [23.Bf1 Qxf1+; 24.Kxf1 looks nice but really wasn't that much fun to play for white].
Nov-04-10  wals: Considered a4 but didn't pursue it.

Rybka 4 x 64

depth 23 : 15 min :
Black blunder
(+0.89):16...c5, relinquishes control of the c file. Best, Qc5, =0.12, c6, = 0.18.

depth 21 : 7 min :
Black blunder
(+3.61):18...Bd7, useless move, no contribution. Best, c4, +1.18, Rb8, +1.19.

White, 19.a4 and Black resigned.

Nov-04-10  BOSTER: <Patriot>
<It took me about 1 minute to see the combo .Is this too long?> My guess this is too long for you. How it could be? But everything depends on your clock, check them. Even <LMAJ> <took a couple of minutes>.
Nov-04-10  WhiteRook48: ouch. I played a4 at the wrong tine
Nov-04-10  Waitaka: <Once><So on one level of the matrix, white wins by a removal of the guard tactic. Good play by white. And if you would like, that is all you need to know. "You take the blue pill, the story ends, you wake up in your bed and believe whatever you want to believe.">

I did solve the problem, but after reading the above, I stopped and went back to it, and spent much more time trying to find any other possible defenses or counterplays for back. Did not find any.

Nov-04-10  Old Wolf: This was easier than Monday's for me.

Q: What interesting positional features are there?
A: Black's d7 bishop is only defended by the queen. (among other things)

Q: How can we deflect the queen?

Once you have asked yourself that question the correct sequence of moves to "check the queen" come to mind immediately.

Nov-04-10  gargle: a4, queen takes, the rook harasses her from a1 and a5 and the bishop goes. I'm chuffed. Never got a Thursday before, and got today's in like fifteen seconds. Woo hoo!
Premium Chessgames Member
  Once: <Waitaka> The combination at the end was pretty straightforward with no reasonable defences for black. But the question I wanted to explore was how black got into this losing position, and what he could have done differently before playing the losing Bd7 move.
Nov-05-10  cjgone: Completely missed it, didn't even notice the pawn.
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