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Magnus Carlsen vs Hikaru Nakamura
"Nak'd Out" (game of the day Jun-14-2017)
Tata Steel Group A (2011), Wijk aan Zee NED, rd 8, Jan-23
Sicilian Defense: Najdorf. Opocensky Variation (B92)  ·  1-0



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Given 49 times; par: 44 [what's this?]

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Kibitzer's Corner
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Premium Chessgames Member
  morfishine: I had the insane move too early: <27.Rxf8+>


Mar-22-15  wooden nickel: This Opocensky Variation worked similar to an English Attack. The move 27.Rxf8+ looked good at first,
after forcing Kxf8... then saccing a Bishop (or even the Rook) on h6! i.e. 28.Bxh6 gxh6 29.Rxh6

click for larger view

However Black doesn't have to accept and plays 28. ... Rxc3!

Premium Chessgames Member
  Penguincw: Ah, trip down memory lane. I remember watching this game live, in my first days on <cg>, which was 4 years ago.

Anyway, my long term memory isn't as good as I thought, as I went for 27.Rxh6. :|

Mar-22-15  lost in space: After hours of calculation my comp - running shredder 12 - came up with the following lines as best after 27. Nd5 Bxd5 28. exd5

click for larger view

shredder 12, d=22

A: +2,36; 28...Qa4 29. c3 Qc4 30. Bf4 Rc7 31. Ne6 Rxe6 32. dxe6 Qxe6 33. Bxe5 dxe5 ...

B: +3,08; 28...Rc4 29. Ne6 Ra4 30. a3 Rg4 31. Qf2 Rxg6 32. Rhg1 Rxg1 33. Qxg1 Rxe6 34. dxe6 Qd5 35. Bxh6 Qxe6 36. Qg2...

C: +5,2; 28...Qb4 --> should transpose to line A after 29. c3; have to let the comp run deeper.

Very complex. I never ever would have considered allowing Ne6 and claim this as better than Qxd5 were Ne6 is not possible directly.

What you can see is how good these 2 guys are able to play chess

Premium Chessgames Member
  whiteshark: I tried hard to make <27.Rxh6> work but failed. You have to find a lot of only moves on both sides to finally get a ♗+4♙ : ♘+3♙ endgame for white.
Premium Chessgames Member
  whiteshark: So here's the comp.line: <27. Rxh6 gxh6 28. Nxe6 Rxe6 29. Qh3 Rce8 30. Rxf8+ Kxf8 31. Qxh6+ Ke7 32. b4 Qc7 33. Nd5+ Kd7 34. Nxc7 Rxg6 35. Nxe8 Rxh6 36. Bxh6 Kxe8>

click for larger view

Premium Chessgames Member
  thegoodanarchist: The choices for first move are quite limited, since White must stop ...Qxa2#

But even so, does White check on f8 with the rook, or does he block the Black Bishop's attack of the a2 square?

And after that, it gets really complicated :)

Mar-22-15  engineerX: what is this random nonsense by chrisowen?
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the bishop pair.

Black threatens 27... Rxc3 28.Nxe6 (28.b(Q)xc3 Qxa2#) 28... Rxg3, winning.

The first idea that comes to mind is 27.Rxh6 but is met with 27... gxh6 (27... Rxc3 28.Rh8+ and mate in two).

Another option is 27.Nxe6, stopping the threat, removing one of Black's best pieces, enabling d5 for the other knight and preparing an eventual Bxh6.

That's all I can do today.

Mar-22-15  scormus: <lost in space> you and shredder are working well. On a deeper search (d=22), I get 27 Nd5 comes out better. Then ... Bxd5 28 exd5 Qa4 29 c3. After a lot of thought the engine has difficulty between ... Qc4 and ... Rc7. I suspect a human player would choose ... Rc7 to keep some control on that rank, with the option of .... Qd7 as well.
Premium Chessgames Member
  patzer2: <Scormus><However, the engine gives 27 Nd5 is completely winning for W if B makes the natural recapture 28 ... Qxd5 (the game move). It recommends instead (the hard to spot)28 ... Rc4 followed by 29 Ne6 Rg4 as "minimizing the damage">

<lost in space>:<After hours of calculation my comp - running shredder 12 - came up with the following lines as best after 27. Nd5 Bxd5 28. exd5 ...B: +3,08; 28...Rc4 29. Ne6 Ra4 30. a3 Rg4 31. Qf2 Rxg6 32. Rhg1 Rxg1 33. Qxg1 Rxe6 34. dxe6 Qd5 35. Bxh6 Qxe6 36. Qg2...>

Verified the analysis of <lost in space> on Deep Fritz 14 to 24 depth on an i7-4790 running at 3.6GHZ and expanded on it to verify the win:

After <28... Rc4!? 29. Ne6 Ra4 30. a3 Rg4 31. Qf2 Rxg6 32. Rhg1 Rxg1 33. Qxg1 Rxe6 (not 33... Qxd5?? 34. Rxf8+ Rxf8 35. Qxg7#) 34. dxe6 Qd5 35. Bxh6 Qxe6 36. Qg2 > (end of <lost in space>'s shredder 12 analysis), my analysis on Fritz 14 continues 36...Qc4 37. Bg5 Qb5 38. Qh3 Nf7 39. Qf3 Qd7 40. Qd5 Qe8 41. Bd2 Qe7 42. Rh1 g5 43. Re1 Qf6 44. Qxb7 Bg7 45. Re8+ Kh7 46. Qe4+ Qg6 47. Qh1+ Nh6 48. Re7 Kh8 49. Kb1 Be5 50. Qh3 g4 51. Qxh6+ Qxh6 52. Bxh6 g3 53. Be3 g2 54. Rxe5 dxe5 55. b4 with mate soon to follow.

Mar-23-15  scormus: <patzer2> thanks for the in-depth analysis. You and your machine did a lot of work. <several hours on an i7-4790> is a serious amount of processing. Well done!

Yes, I followed your line to 37. Bg5. At this point my engine has 37 ... Qc6 and evals it at +2.43/d=23, admittedly with just 10 mins for the move. After 37 ... Qb5 it gives 38 Qh3 Qd7 39 Qb3+ Nf7 40 Qd5 (+2.59, d=25), having first picked 38 ... Nf7 and later switched to ... Qd7 on deeper search.

IMHO it looks won for W simply by virtue of the material and positional superiority after B needed to give up the exchange (37 ... Rxe6) in order to stay in the game. But I doubt if there is a forseeable forced #. Instead it will go to an endgame.

I think what this shows is just how amazing the OTB play was, and Magnus' ability to see through the forest of complication when playing 2 Nd5.

I think it shows that no amount of computing effort will advance the quality of our assessment of such positions unless that very considerable human brain time is spent. But that is my personal view and one I know not everybody agrees with.

Mar-24-15  lost in space: 27. Nd5 Bxd5 28. exd5

click for larger view

shredder 12, d=24 (deeper run)

A: +3,16 28...Rc4 29. Ne6 Rg4 30. Qf2 Rxg6 31. Rhg1 Rxg1 32. Qxg1 Rxe6 33. dxe6 Qd5 34. Bxh6

click for larger view

B: +4,02; 28...Qa4 29. c3 Rc7 30. Qf2 Qd7 31. Ne6 Qc8 32. Nxc7

C: +4,66; 28...Rc7 29. Ne6 Rxe6

<scormus> seems to be right

Mar-24-15  lost in space: 27. Nd5 Bxd5 28. exd5 Qxd5 (?)

click for larger view

shredder 12, d=18: +5,9

29. Bxh6 gxh6 30. g7 Nf7 31. gxf8(R)+ Kxf8 32. Nf5 Re6 33. Rhg1 Ke8 34. Qg8+ Kd7 35. Qxf7+ Kc6 36. Rd1 Rc7 37. Qxc7 Kxc7 38. Rxd5 Rf6

click for larger view

Mar-24-15  lost in space: with d=22 we have the same line but 38...h5 (instead of 38...Rf6. The mayor difference is the evaluation : +9,78
Feb-04-17  Toribio3: Awesome! Carlsen the Quenqueror! Breaking the kingside of the opponent is the theme of the game.
Jun-14-17  RookFile: Did Naka castle too soon?
Premium Chessgames Member
  ChessHigherCat: How can anybody claim Carlsen's getting senile after playing through that game?
Premium Chessgames Member
  offramp: Today's pun is based on the famous <Nak'dİ> gluten-free cereal bars which must be taken OUT of their wrappers before they can be eaten, because the wrappers contain gluten.
Jun-14-17  SirRuthless: Ahh 2011. I was going to be a SWE at Google in those days...

... and then I woke up.

Premium Chessgames Member
  morfishine: <offramp> lol


Jun-14-17  Eusebius: Great game.
But can someone please explain White's 18.Ka1 to me?
Premium Chessgames Member
  tamar: Carlsen explained it as a "clever, prophylactic move" avoiding tricks by Black.

if 18 Nd4 Nc4 19 Qe1 Qb6 20 Bc1 Na3+ 21 Ka1 Qxd4

click for larger view

Premium Chessgames Member
  kevin86: the Champ makes it big here.
Premium Chessgames Member
  ChessHigherCat: <tamar> Thanks for the link, I've never seen Carlsen speak before and not only does he appear to be a human being but a very nice one, too!

His clever prophylactic tricks worked a lot better than Julian Assange's in Sweden, where the girls said Julian took his off without telling them to satisfy his urge to procreate, giving a whole new meaning to "Wiki leaks".

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