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The Chessgames.com Challenge
Team White vs Team Black
C U R R E N T   P O S I T I O N

  
   Chessgames Challenge
Can large groups of chess fans team up to create a chess masterpiece? Find out in Chessgames Challenge!  You can vote for the move you think is best, and discuss the game with other members in the Kibitzer's Corner.

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[flip board] GAME OVER: 1/2-1/2 [flip board]

MOVES:
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Nd5 Be7 10.Bxf6 Bxf6 11.c3 O-O 12.Nc2 Bg5 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Bd7 16.Nce3 Bxe3 17.Nxe3 Ne7 18.Ra2 Bc6 19.Qd3 Qd7 20.b3 Rfd8 21.Rd2 Qb7 22.f3 Rd7 23.Ke2 Rad8 24.Rhd1 d5 25.exd5 Nxd5 26.Nxd5 Bxd5 27.Bxd5 Rxd5 28.Qe4 Rxd2+ 29.Rxd2 Qxe4+ 30.fxe4 Rb8 31.Rb2 Kf8 32.Kd3 Ke7 33.Kc2 h5 34.Ra2 Rb5 35.c4 Rc5 36.Kc3 1/2-1/2
GAME OVER thank you for playingit is now 14:25:56
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WARNING ABOUT COMPUTER USE:  The use of chess playing computers is strictly prohibited during this game. You may not post computer analysis or evaluations to the Kibitzer's Corner, or consult chess playing computer software, including endgame tablebases, to help you decide on a move. Anybody violating this rule will be suspended from the game. Chess databases (such as chessgames.com) and reference materials are permitted. Thank you for preserving the integrity of this contest.

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 179 OF 182 ·  Later Kibitzing>
Sep-17-13  DanLanglois: Keeping these adventures in mind, I look at this: <31.Kd1 f5 32.Kc2 fxe4 33.Rd5 Rf8 34.c4 Rf2+ 35.Kc3 Kf7 36.Rxa5 Ke6 37.Ra6+ Kf5 38.c5 e3 39.b4 e4 40.b5 Rf1 41.Ra2>

And figure that the attempt is this: 37. b4

37...e3 38. b5 Rd1 39. Ra1 Kd6 40. Re1 Rxg2 (this is provoked, as apparently being never good, for Black) 41. Rxe3 Rxh2 42. Rd3+ Kc7 43. c5 Rf2 44. Rd6


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Now, why does Black have to play 40...Rg2. 40...Ra2 41. Rxe3


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41...Ra3+ 42. Kc2 Ra2+ 43. Kd3


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Black's pawns can be attacked. At least here, 43...Rxg2 seems prudent. 44. Re2


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And this is wicked because Black cannot exchange rooks. 44...Rg4 45. Kc3 Rd4 46. Kb4


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looks zugzwangish for Black. Look how far back Black's e-pawn is. 46...e4 47. h4 g6 48. Re1 h6 49. Re3 h5


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Black's in zugwang. Wait, you say, it's White's move!

50. Rg3


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And I don't guarantee that this is 'won'. Black seeks Amy.

Sep-17-13  DanLanglois: Such positions as this are won (Black to move):


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Sep-17-13  DanLanglois: Which means, I need to respond to this:
<stunningmove: <DL> A lot of what you are looking at were the original lines that <YouRang> and I analyzed. I threw a lot of lines away after they moved Rb2 but here is what I saved. One thing we became aware of right away is that the g and h pawns are probably poison and moving Rd2 for black is necessary. This was all done without computers so errors may exist. Of course, computers make silly moves as well. I would assume they would take the white g pawn if given the choice. And sure enough it did. Try this without the computer suggestion of Rxg2. 31. Kd1 f5 32. Kc2 fxe4 33. Rd5 Rf8 34. c4! Rf2+ 35. Kc3 Kf7 36. Rxa5 Ke6 37. b4 e3!

38. Ra6+

(38. b5 Rxg2 39. Kd3 e2 40. Kd2
e1=Q+ 41. Kxe1 Rxh2 42. Ra6+ Kd7 43. c5 Rb2 44. c6+ Kd6)

38. .. Kf5 39. c5 Rd2 (notice how that at this point black is 2 tempi ahead of your version because he didn't take the g pawn.)

40. Ra1

(40. c6 Ke6 41. b5 Kd6 42. Ra1 Rd5 43. Kb4 e2 44. Re1 Rd2 45.Kc3 Rd5 ½)

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40. .. Ke4! 41. c6 Rd3+ 42. Kc4 Rd2 43. Kb5 Rc2 44. Kb6 Kd5 45.Rd1+ Ke6 46. Re1 Kd6 47. b5 e2 48. Kb7 e4

49. b6 Rxc6 50. Rxe2 Rc4

I quickly ran my Houdini 1.5 over this and it all seemed to work at 26 ply. If you are so motivated you might find something that <YouRang> and I missed let me know. I still see it as a draw, by the skin of our teeth.>

This part:
<(38. b5 Rxg2 39. Kd3 e2 40. Kd2 e1=Q+ 41. Kxe1 Rxh2 42. Ra6+ Kd7 43. c5 Rb2 44. c6+ Kd6)>

This part: 38...Rxg2.

Sep-17-13  DanLanglois: And Brittany Spears sings 'If You Seek Amy'? No, the joke was always old. Brittany Spears' new single, btw, apropos of nothing, is 'Work Bitch'.
Sep-17-13  DanLanglois: 39. Ra1 Rxh2 (thematic, we now know, to allow this) 40. b6 Kd7 41. c5 Kc6 42. Ra7 Rh1 43. Rc7+


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43...Kd5 44. Kd3 e4+ 45. Kxe3 Rh3+ 46. Ke2 Rh2+ 47. Ke1


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Very minimalist themes, an endgame. 47...Rh1+ 48. Kf2


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48...Rh2+ 49. Kg1


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1-0

Sep-17-13  YouRang: <Nickster> <WinKing> I spent time last night looking at your black defense line.

<38.c5 e3! 39.b4 e4! 40.b5 Rf1! 41.Ra2 Rb1!>

As far as I could tell, it holds.

~~~~~

So to summarize:

During the game, I thought for a little while that the 31.Kd1 line was drawn, but then I became worried that it was a white win. However, after some research, I decided it was draw after all, and it became a moot point when white played 31.Rb2.

In the post-game analysis, I became convinced that 31.Kd1 really would have been a white win, but now it appears that I was wrong again, and it really is a draw.

I think I'll stop working on it now, as the flipping and flopping is wearing me out.

Of course, we'll never know what would have happened had white actually played 31.Kd1. In a way, I'm glad, but in another way, it's a pity, because it would have been a great challenge for both sides. :-)

Sep-17-13  Nickster: <YouRang: <Nickster> <WinKing> I spent time last night looking at your black defense line.

<38.c5 e3! 39.b4 e4! 40.b5 Rf1! 41.Ra2 Rb1!>

As far as I could tell, it holds.

~~~~~

So to summarize:

During the game, I thought for a little while that the 31.Kd1 line was drawn, but then I became worried that it was a white win. However, after some research, I decided it was draw after all, and it became a moot point when white played 31.Rb2.

In the post-game analysis, I became convinced that 31.Kd1 really would have been a white win, but now it appears that I was wrong again, and it really is a draw.

I think I'll stop working on it now, as the flipping and flopping is wearing me out.

Of course, we'll never know what would have happened had white actually played 31.Kd1. In a way, I'm glad, but in another way, it's a pity, because it would have been a great challenge for both sides. :-)>

Thank you for your input. I too am getting tired of this. The whole line is way too complex without engines to guide the way. I'll write up a little summary of the whole 31.Kd1 line when I get a chance.

Sep-18-13  stunningmove: <Nickster> <YouRang> I know exactly what would have happened if Kd1 was played. We'd be involved in an incredibly complex and exciting endgame in the midst of the game with GMSW. Imagine that?

I regret it wasn't played BUT I'm happy we have more time for the GM Challenge game.

Sep-18-13  hoodrobin: <YouRang> For every game and every move you can think of "what if...?". I don't see your point perhaps. ;-)
Sep-18-13  morfishine: <Thanh Phan> Your comments are very kind. In a complicated game, and I'm referring to chess in general, its best to keep things simple as much as possible. Here, I am analyzing moves 15-19 trying to improve for both sides. The idea is simple: a White improvement reflects a stronger line to convert slight advantage to real advantage; while a Black improvement reflects a better line to maintain

*****

Sep-18-13  YouRang: <hoodrobin: <YouRang> For every game and every move you can think of "what if...?". I don't see your point perhaps. ;-)>

Well, I think I agree with you, but I'm not sure which comment I made that you're responding to.

Sep-19-13  YouRang: <stunningmove> Yep, it's time to move on. BTW, it was a pleasure working with you during this game. See you over at GMSW (eventually).
Sep-19-13  hoodrobin: <YouRang: Of course, we'll never know what would have happened had white actually played 31.Kd1. In a way, I'm glad, but in another way, it's a pity, because it would have been a great challenge for both sides. :-)>

That is your comment I was responding to.
Sorry for confusion.

Sep-19-13  YouRang: <hoodrobin> Ah, well then I see your point. It's true that we never will know what happened had <any> other move had been played in this game.

I thought white's 31st move was worth singling out from the rest because <31.Rb2> was biggest surprise to those of us on team black. Also, the post-game analysis has shown that 31.Kd1 may have given white some serious winning prospects.

So, while I would agree that we could (in theory) do "what-if" on any move, there are some moves stand out as more interesting than others (e.g. 31.Rb2 is interesting, 30.fxe4 is not).

Sep-19-13  hoodrobin: <YouRang> White debated move #31 passionately (though everyone almost knew it was a draw :).
Sep-20-13  morfishine: <YouRang> Well, I am looking for improvements for both sides between moves 15 - 20

This game has been an excellent exercise in assessing positions without engine assistance. IMO, the game is dead even after move 14. However, again IMO, there's been a miniscule shift in White's favor by move 20. Not that White has gained a clearly winning advantage, but that Black's winning chances have dropped to zero.

I am looking at <15.Be2> which has much to recommend it: (1) White prepares to castle bringing his King rook into play (2) White gains influence on the King Side (3) White's Queen is freed up from task #2 & (4) White's WSB sits comfortably on e2 ready to move in any direction

I think <15.Be2> is a good place to start

*****

Sep-24-13
Premium Chessgames Member
  AylerKupp: <Availability of Updated ATSS>

Well, too late for the BOB-4 game but, in case we ever get a chance to use the ATSS again, I finally got the updated ATSS ready for downloading and evaluation. I implemented a PGN-type viewer that allows you to select an analysis and look at the moves and comments, plus the usual things like moving forwards or backwards, moving to the first or last line of the analysis; all the usual stuff. Plus some ATSS-specific things like moving to the move you selected, moving to the starting move of the analysis (hopefully handy if you're doing engine analysis), and moving to the current move of the game. And, boy, do I now have a lot of respect for people who write PGN Viewers! Not a simple or straightforward task, or at least it wasn't for me.

You can download a beta version of the updated ATSS here http://www.mediafire.com/?c8znrhx7b.... I would love to get some feedback on its aesthetics, ease of use, robustness (i.e. how often does it crash), etc. There is a description of the Analysis Viewer (or, as I call it, AV for short) in the 'Notes' tab of the spreadsheet and I would love some comments on that also. Warning: It's written in my usual verbose style, but it does have a nice diagram (I think) of what the AV looks like.

I incorporated only one Move Tab, roughly the Move Tab corresponding to the still-applicable analyses prior to Black's 29th move. I say "roughly" because I was surprised and dismayed (although perhaps I should not have been) at how many mistakes there were in the ATSS for this move. I had to fix them during checkout in order to verify that the AV was working properly. This was the fault of both the posters in specifying bad lines (and I think I was the worst offender in this respect) and me when I was trying to interpret the multi-variation posts and convert them into a format suitable for adding to the ATSS. In that respect this AV is a good thing because it is merciless in identifying move errors, so in the future when using it prior to making each ATSS Update available for downloading it will greatly help to improve the quality of the information in it.

This post is technically off-topic for this page but it seemed to be the logical place to post the announcement of the AV's availability using some of the analysis in the BOB-4 game. If you're going to give me some feedback please post any comments on my forum or send me an email at AylerKupp@gmail.com. I've posted a brief (for me!) description of the AV that will probably be easier to read than the information in the 'Notes' tab. And, after you try it, let me know of any additional features that you think might be useful or any features that you think can/should be improve.

This is only Stage 1 of a planned 2-stage update and I have some additional capabilities in mind that will make it truly useful as an analysis tool. But that will take a while longer. I also plan to incorporate it into the SGSS (remember that?) since I think it will be very useful in looking at the games.

Oct-25-13
Premium Chessgames Member
  kutztown46: I performed deep ply analysis of this game using Stockfish 4 starting with white's 11th move. I am posting the results - one post per move.
Oct-25-13
Premium Chessgames Member
  kutztown46: After 10. Bxf6 Bxf6:


click for larger view

Analysis by Stockfish 4 64 (34-ply, 12 hours):

1. = (0.14): 11.c3 0-0 12.Nc2 Bg5 13.a4 bxa4 14.Nce3 Ne7 15.Qxa4 Nxd5 16.Nxd5 a5 17.Bc4 Bd7 18.Qa3 Qb8 19.0-0 a4 20.Qa2 Qb7 21.Nb4 Qc7 22.Rfd1 Bg4 23.Re1 Bd7 24.Nd5 Qc6 25.Ne3

2. = (0.12): 11.c4 b4 12.Nc2 Rb8 13.Be2 Bg5 14.0-0 0-0 15.Qd3 Be6 16.b3 Kh8 17.Nde3 Kg8 18.Rab1 Qc7 19.Nd5 Qa5 20.Ra1 Qd8 21.Rad1 a5 22.Rfe1

3. = (0.00): 11.Be2 0-0 12.c3 Bg5 13.0-0 Be6 14.Nc2 Ne7 15.Nxe7+ Qxe7 16.Bg4 Bc4 17.Be2 Be6

4. = (0.00): 11.Bd3 Bg5 12.0-0 0-0 13.c4 bxc4 14.Bxc4 Kh8 15.Ne3 Rb8 16.b3 Ne7 17.Be2 Bb7 18.Nac4 Bxe4 19.Nxd6 Bxe3 20.fxe3 Bd5 21.Nc4 Qc7 22.Qe1 f6 23.Rd1 Qa7 24.Bd3 Rfd8 25.Qh4

5. = (-0.08): 11.Nb1 Rb8 12.a4 bxa4 13.Rxa4 Rxb2 14.Na3 0-0 15.Bxa6 Nd4

6. = (-0.14): 11.g3 Bg5 12.c3 0-0 13.Nc2 Ne7 14.Nce3 Nxd5 15.Nxd5 Be6 16.Bg2 Qb8 17.h4 Bd8 18.Qd2 Qb7 19.Rd1 Rc8 20.0-0 Rc5 21.Ne3 Be7 22.Rfe1 Rd8 23.a3 Bb3 24.Ra1 a5 25.Nf5

11. c3 was played.

Oct-25-13
Premium Chessgames Member
  kutztown46: After 11. c3:


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Analysis by Stockfish 4 64 (35-ply, 12 hours):

1. = (0.14): 11...Rb8 12.Nc2 0-0 13.h4 Be7 14.g3 Qe8 15.a4 Bd8 16.axb5 axb5 17.Nce3 Be6 18.b4 Qd7 19.Be2 Ne7 20.Qd3 Qb7 21.Nxe7+ Qxe7 22.0-0 Bb6 23.Nd5 Qd8 24.Nxb6 Qxb6 25.Rfd1 Bc4 26.Qf3 Rfc8 27.Bxc4

2. = (0.16): 11...0-0 12.Nc2 Bg5 13.a4 bxa4 14.Nce3 Ne7 15.Qxa4 Bd7 16.Nxe7+ Bxe7 17.Qc2 Bg5 18.Nd5 a5

3. = (0.16): 11...Bg5 12.Nc2 0-0 13.a4 bxa4 14.Nce3 Ne7 15.Qxa4 Bd7 16.Nxe7+ Bxe7 17.Qc2 Bg5 18.Nd5 a5

4. = (0.22): 11...Bh4 12.Nc2 0-0 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Bd7 16.Nce3 Ne7 17.Ra2 Nxd5 18.Bxd5 Rb8 19.0-0 a4 20.Nf5 Rb6 21.Nxh4 Qxh4 22.Qd2 Rfb8 23.Rd1 Qe7 24.Rb1 Kh8 25.Qc2 g6 26.c4

5. = (0.22): 11...Bd7 12.Nxf6+ Qxf6 13.Nc2 0-0 14.Bd3 Nd8 15.Ne3 Ne6 16.Bc2 Nf4 17.0-0 Rfd8 18.Kh1 Bc6 19.g3 Ne6 20.f3 Rab8 21.a3 a5 22.Qd3 g6 23.b4 a4 24.Kg2 Rbc8 25.Rad1 Qg5 26.h4 Qe7

6. ² (0.38): 11...Bb7 12.Nc2 0-0 13.a4 bxa4 14.Nce3 Bg5 15.Qxa4 Ne7 16.Bc4 Nc8 17.Bd3 Nb6 18.Nxb6 Qxb6 19.Nc4 Qc7 20.Qa5 Bd8 21.Qxc7 Bxc7 22.Na5 Bxa5 23.Rxa5 f5 24.f3 fxe4 25.fxe4 Rf4 26.Rf1 Rh4 27.Bc4+

11...O-O was played.

Oct-25-13
Premium Chessgames Member
  kutztown46: After 11. c3 O-O:


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Analysis by Stockfish 4 64 (36-ply, 10 hours):

1. = (0.24): 12.Nc2 Bg5 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Ne7 16.0-0 Bd7 17.Ra2 Nxd5 18.Bxd5 Rc8 19.Qe2 Qc7 20.Qh5 Bf4 21.Rfa1 Qb6 22.Ne1 a4 23.Nd3 Bh6 24.Nb4 Kh8 25.Rxa4 Bxa4 26.Rxa4 Rc7 27.Ra1 Ra7

2. = (0.16): 12.h4 Be7 13.Nc2 Rb8 14.g3 Be6 15.a3 Rb7 16.Ncb4 Nb8 17.Ne3 a5 18.Nbd5 Nd7 19.Qd3 Nc5 20.Qc2 Nd7 21.Rd1 Re8 22.Be2 a4 23.Nf5 Bf8 24.0-0 Nc5 25.Nfe3 Be7 26.Rfe1 Qd7 27.Bf3 Bd8

3. = (0.00): 12.Be2 Bg5 13.0-0 Ne7 14.Nxe7+ Qxe7 15.Nc2 Be6 16.Bg4 Bc4 17.Be2 Be6

4. = (0.00): 12.Bd3 Bg5 13.Nc2 Ne7 14.Nce3 Nxd5 15.Nxd5 Be6 16.0-0 Qb8 17.Bc2 Rc8 18.Re1 a5 19.a3 Qb7 20.Qh5 h6 21.Qe2 Bxd5 22.exd5 g6 23.g3 Bd8 24.Qd2 Bg5 25.Qe2

12. Nc2 was played.

Oct-25-13
Premium Chessgames Member
  kutztown46: After 12. Nc2:


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Analysis by Stockfish 4 64 (35-ply, 13 hours):

1. = (0.16): 12...Rb8 13.h4 Be6 14.g3 Be7 15.a3 Rb7

2. = (0.24): 12...Bg5 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Ne7

3. ² (0.28): 12...Nb8 13.a4 bxa4 14.Rxa4 Nd7 15.Ra2 Bb7 16.Bc4 Bg5 17.Qd3 Nc5 18.Qe2 a5 19.0-0 a4 20.Ncb4 Kh8 21.Bb5 Bh6 22.Qc2 g6 23.Bc6 Bxc6 24.Nxc6 Qh4 25.Re1 Rac8 26.Na7

4. ² (0.28): 12...Bh4 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Bd7 16.Ra2 a4 17.Nde3 Na5 18.Bd5 Rc8 19.Nf5 g6 20.Nxh4 Qxh4 21.0-0 Nb3 22.f3 Bb5 23.Re1 Nc5 24.g3 Qh3 25.Na3 Qd7 26.Nxb5 Qxb5 27.Qd2 Kg7 28.Rea1

5. ² (0.38): 12...Be6 13.a4 bxa4 14.Rxa4 a5 15.Bc4 Bg5 16.0-0 Ne7 17.Nce3 Bd7 18.Ra1 a4 19.b3 axb3 20.Rxa8 Qxa8 21.Nxe7+ Bxe7 22.Nd5 Qd8 23.Qxb3 Bg5 24.Ra1 Qb8 25.Ra6 Qxb3 26.Bxb3 Be6 27.Rxd6 Rb8 28.Bc2

6. ² (0.44): 12...Bb7 13.a4 bxa4 14.Nce3 Bg5 15.Qxa4 Ne7 16.Bc4 Nxd5 17.Nxd5 Kh8 18.0-0 f5 19.exf5 Rxf5 20.Bd3 Rf8 21.Be4 Rb8 22.Qc2 Qc8 23.b3 Bd8 24.Rfd1 Bb6 25.Nxb6 Bxe4 26.Qxe4 Rxb6 27.Qc2 Qb7 28.Qd2

12...Bg5 was played.

Oct-25-13
Premium Chessgames Member
  kutztown46: After 12...Bg5:


click for larger view

Analysis by Stockfish 4 64 (36-ply, 10 hours):

1. = (0.24): 13.a4 bxa4 14.Nce3 Bd7 15.Rxa4 a5 16.Ra2 Ne7 17.Nxe7+ Qxe7 18.Nd5 Qd8 19.Bc4 a4 20.Bd3 Rb8 21.0-0 Qc8 22.Qh5 Bd8 23.Qf3 Qc5 24.Qe2 Rb7 25.Rfa1 Bg5 26.Nb4 Ra7 27.g3 Rc8 28.Ba6 Rd8

2. = (0.14): 13.h4 Bh6 14.a4 bxa4 15.Nce3 Ne7 16.Qxa4 Rb8 17.Nxe7+ Qxe7 18.Nd5 Qe6 19.Qc2 Qg4 20.Rh3 Qd7 21.g4 Bf4 22.f3 Bb7 23.Nxf4 exf4 24.c4 Bc6 25.Rh2 Rb6 26.c5 dxc5 27.Qxc5 Qb7 28.Rd2 Rxb2

3. = (0.00): 13.Be2 Ne7 14.Nxe7+ Qxe7 15.0-0 Be6 16.Qd3 a5 17.Rfd1 Rfd8 18.Qf3 Rab8 19.Ne3 Bxe3 20.Qxe3 Qb7 21.Rd2 Qc6 22.Rad1 Ra8 23.Qd3 Bc4 24.Qc2 Be6 25.b3 Rac8 26.Qd3 a4 27.b4

4. = (0.00): 13.Bd3 Ne7 14.Nce3 Be6 15.0-0 Rb8 16.Be2 Nxd5 17.Nxd5 Kh8 18.Qd3 a5 19.Rad1 f5 20.Bf3 fxe4 21.Bxe4 Qd7 22.Qg3 Bh6 23.b3 a4 24.Qd3 g6 25.Nb4 Rb6 26.Nd5 Rbb8

13. a4 was played.

Oct-25-13
Premium Chessgames Member
  kutztown46: After 13. a4:


click for larger view

Analysis by Stockfish 4 64 (36-ply, 3 hours):

1. = (0.24): 13...bxa4 14.Nce3 Bd7 15.Rxa4 a5 16.Ra2 Ne7 17.Nxe7+ Qxe7 18.Nd5 Qd8 19.Bc4 a4 20.Bd3 Rb8 21.0-0 Qc8 22.Qh5 Bd8 23.Qf3 Qc5 24.Qe2 Rb7 25.Rfa1 Bg5 26.Nb4 Ra7 27.g3 Rc8 28.Ba6 Rd8 29.Bc4

2. ² (0.62): 13...Rb8 14.axb5 axb5 15.Bd3 Be6 16.0-0 Qc8 17.Ncb4 h6 18.Nxc6 Qxc6 19.Nb4 Qd7 20.Ra6 Rfc8 21.Qe2 Bd8 22.Kh1 Bg4 23.f3 Be6 24.Rfa1 Rb7 25.Ra8 Bc4 26.Bxc4 bxc4 27.Rxc8 Qxc8

3. ± (0.84): 13...Bb7 14.axb5 axb5 15.Bxb5 Rxa1 16.Qxa1 Ne7 17.Ncb4 Nxd5 18.exd5 Qb6 19.Bc6 Ra8 20.Qd1 g6 21.0-0 f5 22.Re1 Kg7 23.g3 Ra7 24.Bxb7 Qxb7 25.Kg2 Qb6 26.h4 Bf6 27.Qe2 e4 28.Qc4 Rc7 29.Qa6

4. ± (0.84): 13...Be6 14.axb5 axb5 15.Bxb5 Rxa1 16.Qxa1 Ne7 17.Ncb4 Nxd5 18.exd5 Qb6 19.Qa6 Qxa6 20.Bxa6 Bd7 21.Ke2 Ra8 22.h4 Bf6 23.Bc4 g6 24.f3 Kg7 25.g3 h5 26.Nc6 Ra4 27.Bb3 Ra6 28.Ke3

13...bxa4 was played.

Oct-25-13
Premium Chessgames Member
  kutztown46: After 13...bxa4:


click for larger view

Analysis by Stockfish 4 64 (35-ply, 9 hours):

1. ² (0.30): 14.Nce3 Ne7 15.Rxa4 Nxd5 16.Nxd5 a5 17.Bc4 Kh8 18.0-0 f5 19.Bd3 Bb7 20.Bc2 g6 21.exf5 gxf5 22.Re1 Rb8 23.b4 axb4 24.Rxb4 Bc6 25.Rxb8 Qxb8 26.c4 Qb2 27.Ba4 Bb7 28.Bd7 Qd2 29.Qxd2 Bxd2

2. = (0.22): 14.Rxa4 a5 15.Bc4 Kh8 16.Nce3 Rb8 17.b3 Ne7 18.Nxe7 Qxe7 19.Nd5 Qd8 20.0-0 f5 21.exf5

3. = (0.14): 14.h4 Bh6 15.Nce3 Ne7 16.Qxa4 Rb8 17.Nxe7+ Qxe7

4. ³ (-0.40): 14.Bd3 Rb8 15.Nce3 Rxb2 16.Qxa4 Ne7 17.Qa3 Nxd5 18.Nxd5 Rb8 19.0-0 Be6 20.c4 Bxd5 21.cxd5 Bd2 22.Qxa6 Bc3 23.Ra2 Bd4 24.Rc1 Ra8 25.Qxa8 Qxa8 26.Rxa8 Rxa8 27.g3 g6 28.Kg2 Ra3

14. Rxa4 was played.

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