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Ian Nepomniachtchi vs Hikaru Nakamura
Sinquefield Cup (2017), Saint Louis, MO USA, rd 4, Aug-05
Queen's Gambit Declined: Harrwitz Attack. Main Line (D37)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Aug-05-17  maelith: Nakamura playing too much bullet and blitz is hurting his long game.
Aug-05-17
Premium Chessgames Member
  tpstar: The live commentators criticized 20 ... b6 and thought Nakamura missed 22 ... Ra8 23. Rxc6 Rxa6 24. Bd6 Qd7 25. Bxf8 Qxc6 26. b5 winning material.
Aug-06-17  Ulhumbrus: 20 ...b6 makes a temporary attack on the rook on c5, a target which is mobile, but concedes a more lasting weakness on the square a6. White withdraws the target by Rc5-c1 and keeps his potential threats on a6.
Aug-06-17  CountryGirl: Glad Nepo is on the board with a win. I'd hate to see him get discouraged.
Aug-07-17  Dr Winston OBoogie: I see nothing wrong with d4 here


click for larger view

Livens things up and opens that e file for black no matter what white plays

Aug-07-17  ajile: White plays a sort of hybrid London System-QGD with the pawn to c4 instead of c3 and the DSB outside the pawn chain. Black gives White a good game with 6..c5? since after all the trades in the center Black is left with an isolated d pawn while White is solid as a rock. Finally Black gives up an exchange and this coupled with his weaker pawn position leads to the loss. At super GM level you just can't get away with this type of play in long time controls.

One question I haven't answered yet is why Black didn't take 15..Bxb2. Seems like White will have some trouble to not lose a pawn.

Aug-07-17  ajile: lol OK so I loaded this game into Rybka and the answer to my last question became obvious.

After 15..Bxb2 White has combinations that use Bxh7+ and either Qc2+ or Qd3+ depending on what happens after 15..Bxb2.

Examples:


click for larger view

Analysis by Rybka 3 32-bit :

1. (0.62): 16.Bxh7+ Kxh7 17.Qc2+ Kg8 18.Ng5 g6 19.Qxb2 Qe7 20.Rfd1 Rad8 21.h3 Rd7 22.Qc3 Rfd8 23.Nf3 d4

2. (0.60): 16.Rb1 Bf6 17.Rxb7 Rc8 18.Qa4 h6 19.h3 d4 20.Rd1 Re8 21.Be4 Bd7

Note that it's even worse if Black plays line #2 and takes 16..Bxa3 which is the Qd3+ line:


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Analysis by Rybka 3 32-bit :

1. (0.96): 17.Bxh7+ Kxh7 18.Ng5+ Kg8 19.Qd3 f5 20.Nxe6 Qd7 21.Nxf8 Bxf8 22.Qb5 b6

2. (0.64): 17.Rxb7 Bc8 18.Ng5 g6 19.Nxf7 Rxf7 20.Rxf7 Kxf7 21.Qa4 Nb4 22.Qxa3 Nxd3 23.Qxd3 Bf5 24.Qd4 a5 25.Ra1

Aug-07-17  Dr Winston OBoogie: How are you all missing 11..d4?? What's wrong with that, someone tell me because it looks Morphyesque to me? I just checked with the engine and even though it's about the 5th choice move it's still good, the engine wasn't playing so someone point out to me what's wrong with it? If Morphy or Fischer saw this they'd play it!
Aug-07-17  Dr Winston OBoogie: Ain't no one got nothing to say about 11..d4? Call yourself chess players LOL
Aug-07-17
Premium Chessgames Member
  ChessHigherCat: <Dr Winston OBoogie: Ain't no one got nothing to say about 11..d4? Call yourself chess players LOL>

12. Qc2 is what I gotzta say O Boogie Man.

Aug-07-17
Premium Chessgames Member
  ChessHigherCat: <tpstar: The live commentators criticized 20 ... b6 and thought Nakamura missed 22 ... Ra8 23. Rxc6 Rxa6 24. Bd6 Qd7 25. Bxf8 Qxc6 26. b5 winning material.>

I think those guys are overlooking the intermezzo 22. b5:

20. axb4 b6 21. Rcc1 g6 22. Ba6 Ra8 23. Rxc6 Rxa6 24. b5 Ra1 25. Qd3 Rxf1+ 26. Qxf1

Aug-08-17
Premium Chessgames Member
  tpstar: <ChessHigherCat> Just like the So-Carlsen game, this one went south after a very short sequence of moves.

Looking at the variation 22. Ba6 Ra8 23. Rxc6 Rxa6:


click for larger view

Here if 24. b5 they planned 24 ... Qd7 getting out of the Bd6 Skewer (25. bxa6 Qxc6), so 24. Bd6 first wins at least the exchange. 24. b5 Ra1 is a nice idea which gets Black out of trouble, although then the Pb6 is hard to defend.

Nakamura likes this basic opening (1 ... d5, 2 ... e6, 3 ... Nf6, 4 ... Be7 & 5 ... 0-0) with quick development. Black had a typical IQP position until 18 ... a5 so perhaps the whole Queenside Pawn push plan was faulty. Maybe 18 ... Rfd8 would improve.

Aug-08-17
Premium Chessgames Member
  ChessHigherCat: Hi Tony,

<Here if 24. b5 they planned 24 ... Qd7 getting out of the Bd6 Skewer (25. bxa6 Qxc6), so 24. Bd6 first wins at least the exchange.>

If 24. b5 Qd7 25. Rc7! (instead of bxa6) Q moves and now bxa6. If 25..Ra1 26. Qxa1 Bxa1 27. Rxd7 Bxd7 28. Rxa1 wins a piece for white.

But they didn't plan on 24. b5, right, they planned on 24 Bd6 Qd7, which doesn't lose for black but it doesn't win any material either: if 25. Bxf8 Qxc6). If it really did win an exchange for white they would be crazy to recommend Ra8 for black (they said black "missed Ra8", right?) On the other hand, they're still crazy because it's just a trade of rooks that doesn't win material for anyone, so why do they say it wins material for black.

In either case, I don't see why the claim that N. "missed" Ra8 like it was some killer move.

Aug-08-17
Premium Chessgames Member
  tpstar: <24. b5 Qd7 25. Rc7!> You're right. Also the Intermezzo 25. Rd6 should work, and if 24. b5 Qe8 instead then 25. Rxe6! wins a piece.

I like how Seirawan and Shahade analyze lines in real time without computer help, then Ashley chimes in when needed. Sometimes in the rush of a live broadcast with multiple games, things may get missed, but that helps us learn too. =)

Their point was that he may have missed 26. b5, the scorpion's sting at the tail end of a combination.

Aug-08-17
Premium Chessgames Member
  ChessHigherCat: That's true, they have to analyze off the cuff and they're usually very good and informative, especially Seirawan. For some reason I got the impression that they do consult Stockfish all the time, but maybe that's just Christian and Ashley. Anyway, I take it back, they're not really crazy (at least no more than everybody else :-)

Nepoetc. is fantastic, isn't he? For some reason people always have to pick out a "class dunce" and since he lost a few games he was the chosen scapegoat (along with Caruana! sometimes), but there's not one of them who isn't phenomenal.

Aug-08-17  Dr Winston OBoogie: <ChessHigherCat: <Dr Winston OBoogie: Ain't no one got nothing to say about 11..d4? Call yourself chess players LOL 12. Qc2 is what I gotzta say O Boogie Man>>

Okay 12.. Qc2.


click for larger view

Now what for black?

..BxN. .QxN (KxN is a no no) ..dxe.


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Aug-08-17  Dr Winston OBoogie: *QxB
..
Aug-09-17
Premium Chessgames Member
  ChessHigherCat: <Dr. Winston OBoogie: Now what for black?>

I don't want to play out the whole game like this but I think dxe3 Bxe3 and if Re8 Kg1 (castles). Then if Bf5 Bxf5, of course, because there are no more pins.

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