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Anton Korobov vs Hikaru Nakamura
World Cup (2013), Tromso NOR, rd 4, Aug-21
Semi-Slav Defense: Accelerated Move Order (D31)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Aug-21-13  notyetagm: A Korobov vs Nakamura, 2013

Wow, this is probably the worst game I have *ever* seen Nakamura play, aside from his Black games against Carlsen when Carlsen just obliterates him.

Aug-21-13  Sihlous: Computer says black is fine by just snatching a pawn with 18...Nxe5 19.fxe5 Qxe5...as said above...strange game.
Aug-21-13  notyetagm: A Korobov vs Nakamura, 2013

<Sihlous: Computer says black is fine by just snatching a pawn with 18...Nxe5 19.fxe5 Qxe5...as said above...strange game.>

I tried to figure out why Black could not just win a pawn like you pointed out above but could not.

The only thing I could see was the <SKEWER> 20 ♗b4-c3 and then <EXPOSING THE KING> with 21 ♗c3x♗g7 ♔g8x♗g7 but that does not lead to anything. But now I see that even that idea does not work because Black has 20 ♗b4-c3 ♕e5-c7 21 ♗c3x♗g7 ♕c7x♗g7.

Do not understand why Korobov simply gave away a pawn and Nakamura did not take it. Unless Nakamura was worried about defending his castled kingside position without the fianchettoed bishop. But that looks pretty far-fetched.

Aug-21-13  Marmot PFL: <Inexplicably overestimating my chances instead of taking a draw with 18...Nxe5. Oh well, life goes on.>
Aug-21-13  BUNA: Even Korobov said during the interview that he thought he wouldn't "have sufficient compensation" after 18...Nxe5.
Aug-21-13  notyetagm: A Korobov vs Nakamura, 2013

<BUNA: Even Korobov said during the interview that he thought he wouldn't "have sufficient compensation" after 18...Nxe5>

I didn't see anything at all. Maybe the <OPEN FILE> the d-file could be a problem. Maybe not.

<KORCHNOI> would have snapped off that pawn in a heartbeat, then looked at Korobov and said "So, whatcha got?".

:-)

Aug-21-13  notyetagm: A Korobov vs Nakamura, 2013

Game Collection: GREED IS GOOD. SOMETIMES. 18 ... Nf7xNe5 19 d4xNe5 Qf6xe5 wins a pawn for almost nothing

Aug-21-13  Nerwal: I tend to agree with Nakamura's assessment in this case. After 18... ♘xe5 white can probably make a draw (19. dxe5 ♕xe5 20. ♗d6 followed by f4, and black has still development problems, and going after the second pawn with Bh6 would be very dangerous), even if he may be slightly worse in some lines.
Aug-21-13
Premium Chessgames Member
  keypusher: <Nerwal: I tend to agree with Nakamura's assessment in this case. After 18... Nxe5 white can probably make a draw (19. dxe5 Qxe5 20. Bd6 followed by f4, and black has still development problems, and going after the second pawn with Bh6 would be very dangerous), even if he may be slightly worse in some lines.>

I don't understand the assessment (which is all in its favor). After 19....Nxe5 20.de Qxe5 21.Bd6 (say) Qf6 I can see that Black has an extra pawn, that one bishop is bad, that he is weak on the dark squares, that he is a little behind in development and his rooks aren't doing much. So White has compensation. Enough? I have no idea. Nor can I see a path to a draw for either side.

If I were playing Black, I would probably grab the pawn, but it would never occur to me that I was taking a draw by doing so. What am I missing?

Aug-21-13  Nezhmetdinov: Agree with notyetagm, this is barely comprehensible stuff out of Nakamura here, I'd be upset if I played this passively and anti-positionally and I'm RUBBISH.
Aug-21-13  dumbgai: <Marmot PFL: I probably misunderstood Korobov with his Russian accent, but it sounded as if he said Nakamura insulted him on ICC and today he got revenge.>

Nakamura has insulted many, many GMs on ICC over the years. Several of them have gotten revenge OTB.

Aug-21-13  Dragi: Simple is beauty ..This Korobov is some eccentric guy ...who knows maybe Kramnik is next ...But i doubt
Aug-21-13  actinia: good. Nakamura needs to be taken down a peg. from this point forth he'll be great. Pride comes before the fall, he was proud and smug as @#$%, now he had a fall, and now he'll be great at chess.
Aug-21-13  jphamlore: At this level against the wrong opponent, one slip-up in opening preparation will be mercilessly punished.

Take this recent game from the World Cup:

Gelfand vs A Moiseenko, 2013

Moiseenko has played the Queen's Gambit Declined, Ragozin at least 22 times in serious play

http://www.chessgames.com/perl/ches...

and presumably is aware of its nuances. Yet I would say by move 11 at most his position is completely busted positionally, because of Gelfand's preparation. Just look how Gelfand's attack just rolls over Moiseenko after 12. d5.

Aug-21-13
Premium Chessgames Member
  HeMateMe: < actinia: good. Nakamura needs to be taken down a peg. from this point forth he'll be great. Pride comes before the fall, he was proud and smug as @#$%, now he had a fall, and now he'll be great at chess. >

That's a stupid thing to say. everyone can't be as good as Kramnik and Anand. These are eliminatin matches, someone has to lose, but that doesn't mean Nak was arrogant here, or said he was going to win the event.

Aug-22-13
Premium Chessgames Member
  keypusher: Looked at this a little bit with Shredder.

Apparently Nakamura's idea with 18....b6 was 19.Nxc6? Bb7 20.d5 ed 21.cd Qxb2+ 22.Qxb2 Bxb2+ 23.Kxb2 Rxe2+. If 24.Rd2? Rxd2+ 25.Bxd2 Bxc6 26.dc Rc8, and now Rc1 fails to 26....Ne5! threatening the pawn on c6 and the fork on d3.

I wonder if Nakamura just wasn't very enthusiastic about the pawn-up position after 18....Nxe5 and decided he would rather be a pawn down, underestimating White's 19.Ng4.

Later on, 22.c5! is a nice move, squelching black's bishop but seemingly leaving the d-pawn vulnerable. I wondered if Black could get counterplay with 22....a5 instead of the horrible-looking ...b5. But White can just drop the bishop back to c3, because if 22....bxc5 23.dxc5 Qxc5? 24.Bxg6! is crushing.

I don't really understand what was going on in the sequence ending around move 34. Nakamura maneuvered his knight to a square where it attacked the d and f pawns, forcing Korobov to trade off his good bishop to get rid of it. But the result of the sequence was a completely hopeless position for Black.

Chess is a hard game.

Aug-22-13
Premium Chessgames Member
  keypusher: I had the same sense I did with some of Nakamura's catastrophes against Carlsen: Naka just shouldn't lose this badly.
Aug-22-13  dumbgai: Nakamura's problem is a lack of consistency. On a good day he's capable of beating anyone not named Carlsen, but he seems to have more bad days than most other top GMs.
Aug-22-13  coolchess1: Well played by Korobov. It is good to see Nakamura losing the game. Never like Nakamura because of his very arrogant and disrespectful attitude, and I like such people to lose the games.
Aug-22-13  coolchess1: Has anyone noticed that Korobov seems pretty unconventional type of chess player in his dressing style etc. You can say a bit of weird style ?
Aug-22-13  notyetagm: A Korobov vs Nakamura, 2013

<keypusher: I had the same sense I did with some of Nakamura's catastrophes against Carlsen: Naka just shouldn't lose this badly.>

Yep, that is exactly what this game felt like.

Carlsen vs Nakamura, 2011

Carlsen vs Nakamura, 2011

Carlsen vs Nakamura, 2013

Aug-22-13  notyetagm: A Korobov vs Nakamura, 2013

<Nezhmetdinov: Agree with notyetagm, this is barely comprehensible stuff out of Nakamura here, I'd be upset if I played this passively and anti-positionally and I'm RUBBISH.>

The <HOUDINI EVAL> below is only <-0.38> for the variation 18 ... ♘f7x♘e5! 19 d4x♘e5 ♕f6xe5 despite the fact that White is down a whole pawn, so White -definitely- has some good compensation for the sacrificed pawn.

----

http://chessbomb.com/o/2013-worldcu...

<Houdini 3 x64, 683.2 sec, depth 22

<<<-0.38 18. ... Nxe5 19. dxe5 Qxe5>>> 20. Kb1 Qf4 21. Rhg1 Qxf2 22. Rdf1 Qh2 23. Rh1 Qc7 24. h4 c5 25. Bd2 e5 26. Bd3 e4 27. Bxe4 Qb6 28. Bd3 Rd8 29. Bc3 Bxc3 30. Qxc3 Rd4 31. h5 Qb4 32. Qc2

0 18. ... b5 19. h4 c5 20. Bxc5 Bb7 21. Nxf7 Bxh1 22. Rxh1 Qxf7 23. h5 Qxf2 24. hxg6 Bxd4 25. Bxd4 Qxd4 26. Kb1 bxc4 27. Bxc4 Rab8 28. b3 h5 29. Rxh5 Qg1+ 30. Kb2 Qd4+ 31. Kb1 Qg1+

0.2 18. ... Qxf2 19. Rhf1 Qe3+ 20. Kb1 Nxe5 21. dxe5 Qxe5 22. h4 c5 23. Bc3 Qc7 24. Bd3 e5 25. h5 Bg4 26. hxg6 Bxd1 27. Rxd1 h6 28. Be4 Rad8 29. Rh1 Rf8 30. Qg2 b5 31. Bd5+ Kh8 32. Qe4 bxc4 33. Bxc4 Qe7 34. Bf7 Qf6

0.27 18. ... Qh4 19. Rhg1 a5 20. Bc3 Nxe5 21. dxe5 Qxf2 22. Rgf1 Qh4 23. Kb1 a4 24. Bg4 a3 25. Qe4 Qe7 26. b3 Rf8 27. Rxf8+ Bxf8 28. h4 Qf7 29. Qe2 Be7 30. h5 b6 31. hxg6 Qxg6+ 32. Rd3>

Aug-22-13  Captain Hindsight: A solid opening would habe been more appropriate.
Aug-22-13  FamilyTree: 18.Ne5 was some sort of psychological move imo. I can't see what is so terrible for black after 18...Nxe5 19.fxe5 Qxe5

Black can just move the Queen and then play ...e5 to free the Bishop. The computer suggest a kingside attack with h4-h5 etc (probably that is Nakamura was afraid of) but black has many simple and effective defensive resources.

Aug-23-13  notyetagm: A Korobov vs Nakamura, 2013

<FamilyTree: 18.Ne5 was some sort of psychological move imo. I can't see what is so terrible for black after 18...Nxe5 19.fxe5 Qxe5>

Neither can anyone else. Nakamura said that the continuation was drawish (!) and that he overestimated (!) his position.

<Black can just move the Queen and then play ...e5 to free the Bishop. <<<The computer suggest a kingside attack with h4-h5 etc (probably that is Nakamura was afraid of)>>> but black has many simple and effective defensive resources>

Even allowing that attack would have been better than what transpired in the game, with Nakamura being dominated and ground down like a little bitch.

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